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NCIV9411 - onsemi

Manufacturer Part Number
NCIV9411
Manufacturer
onsemi
Allelco Part Number
98D-NCIV9411
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
2,000 pcs available, New & Original
Parts Description
HIGH SPEED QUAD CHANNEL DIGITAL
Package
16-SOIC
Data sheet
NCIV9411.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 2000
  • Unit Price: $3.858
  • Subtotal: $0.00

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Specifications

NCIV9411 Tech Specifications
onsemi - NCIV9411 technical specifications, attributes, parameters and parts with similar specifications to onsemi - NCIV9411

Product Attribute Attribute Value
Manufacturer onsemi
Voltage - Supply 2.5V ~ 5.5V
Voltage - Isolation 5000Vrms
Type I²C, SPI
Technology Capacitive Coupling
Supplier Device Package 16-SOIC
Series Automotive, AEC-Q100
Rise / Fall Time (Typ) 3ns, 2ns
Pulse Width Distortion (Max) 70ns
Propagation Delay tpLH / tpHL (Max) 170ns, 170ns
Package / Case 16-SOIC (0.295", 7.50mm Width)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 125°C
Number of Channels 4
Mounting Type Surface Mount
Isolated Power Yes
Inputs - Side 1/Side 2 3/1
Data Rate 10Mbps
Common Mode Transient Immunity (Min) 100kV/µs
Channel Type Unidirectional
Base Product Number NCIV94

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What makes the NCIV9411 suitable for automotive applications requiring galvanic isolation between microcontroller and sensor interfaces?
The NCIV9411 combines AEC-Q100 automotive qualification with 5000Vrms isolation voltage and capacitive coupling technology, enabling robust noise rejection in high-EMI vehicle environments. Its 100kV/µs common mode transient immunity directly addresses automotive switching noise from DC-DC converters and inductive loads. The -40°C to 125°C operating range covers underhood thermal extremes without performance degradation, while the 16-SOIC package's compact 7.50mm width fits space-constrained engine bay layouts. Automotive-grade components like the NCIV9411 reduce system-level noise coupling and prevent ground loops that would otherwise degrade sensor signal integrity in CAN or LIN bus topologies.
How does the NCIV9411 compare to optoisolator-based isolation in terms of propagation delay and power efficiency for real-time control systems?
The NCIV9411 achieves 170ns maximum propagation delay with capacitive coupling, compared to 1–2µs typical for optoisolators, making it suitable for time-critical closed-loop feedback. Its sub-nanosecond rise/fall times (3ns/2ns typical) enable cleaner digital edges needed for high-frequency SPI or I2C transactions. Power consumption for the NCIV9411 remains relatively flat across supply voltage (2.5V–5.5V), whereas optoisolators exhibit strong temperature-dependent leakage. For automotive applications using the NCIV9411, the reduced propagation skew (170ns tpLH and tpHL match) minimizes data timing errors in multi-channel sensor hubs operating at 10Mbps, reducing firmware compensation overhead compared to optoisolator-based designs.
Can the NCIV9411 isolate I2C and SPI simultaneously on separate channel pairs, or does the 4-channel architecture require protocol selection?
The NCIV9411 uses a fixed 3/1 channel configuration (three channels on Side 1, one on Side 2), which accommodates mixed-protocol isolation but requires careful pinout planning. Users cannot dynamically switch between I2C and SPI; instead, the NCIV9411 isolates static protocol assignments at layout time. A typical automotive implementation might allocate two NCIV9411 channels for SPI (clock and data) to an isolated sensor module, leaving one channel available for an interrupt or enable signal. Alternatively, discrete I2C isolation (clock and data) could occupy two NCIV9411 channels on a separate device. The unidirectional channel architecture of the NCIV9411 means I2C open-drain bus structures require external buffers on both sides of the isolation barrier, unlike bidirectional isolators. For complex multi-protocol systems, multiple NCIV9411 devices staged at different isolation nodes provide clearer topology.
What is the relationship between the NCIV9411's 70ns pulse width distortion and timing closure in high-frequency digital signal chains?
The NCIV9411's 70ns maximum PWD directly limits the minimum pulse width that can propagate across isolation without distortion; pulses shorter than ~140ns round-trip (crossing the barrier twice) may suffer duty-cycle errors. In automotive SPI applications running at 10Mbps, clock period is 100ns, so the NCIV9411's 70ns PWD represents a significant fraction of bit time. Designers using the NCIV9411 must ensure SPI clock duty cycles remain 45%–55% post-isolation to avoid setup/hold violations in downstream receiver flip-flops. Firmware implementing bit-banged I2C over the NCIV9411 should maintain clock stretching durations >200ns to stay well clear of PWD-induced edge jitter. High-speed ADC control loops requiring <50ns jitter margins should validate the NCIV9411 PWD empirically or consider lower-integration alternatives; conversely, slow sensor buses (I2C at 100kHz) see negligible impact from the NCIV9411's 70ns specification.
How does the NCIV9411 compare to integrated mixed-signal isolators in protecting analog-to-digital converter inputs from digital switching noise?
The NCIV9411 is a digital-only isolator; it provides no analog signal path or integrated ADC, so it cannot directly isolate analog measurements. Its strength lies in creating a clean digital ground reference on the isolated side, reducing noise coupling into nearby analog front-ends through substrate and PCB return paths. Automotive designs using the NCIV9411 typically pair it with discrete isolated power supplies (isolated 3.3V regulators for the sensor side) to maximize noise separation. Mixed-signal isolators (such as TI ISO7x4x or NXP TJA1047) combine NCIV9411-class digital isolation with integrated high-voltage gates or analog channels but incur higher cost and larger footprints. For a microcontroller-to-isolated-sensor-module topology, the NCIV9411's lean 16-SOIC package (7.50mm width) occupies less board real estate than a mixed-signal part, allowing space for dedicated isolated power and filtering. The trade-off is that NCIV9411 users must hand-route isolated supplies and ground planes, whereas all-in-one isolators simplify integration at the cost of less flexibility.
What PCB layout considerations are critical when routing the NCIV9411 to maintain its 5000Vrms isolation rating in a production environment?
The NCIV9411's 5000Vrms rating assumes physical spacing and dielectric separation between the high-voltage side and low-voltage side; PCB layout directly determines whether this rating is achievable in practice. Minimum trace-to-trace spacing of 6 mils (0.15mm) between isolated domains is typical for 5000V creepage, though specific requirements depend on PCB material (FR-4 CTI rating). The NCIV9411 16-SOIC package places input pins on one side and output pins on the other; routing must use a full isolation gap (keepout zone) down the board center, with power and ground planes separated by score line or segmented return vias. Input capacitors for the NCIV9411 supply pins must connect to their respective domain grounds, not cross the isolation barrier. Automotive manufacturing (AEC-Q200) qualification of the NCIV9411 implies IPC-A-610 Class 2/3 soldering standards, but creepage/clearance validation occurs post-assembly, so silkscreen annotations documenting the isolation gap are essential for production QA. Moisture (MSL 1 on the NCIV9411 means unlimited shelf life) is less of a concern than mechanical stress; flexing during thermal cycling can cause creepage path degradation if isolation gaps are undersized.
Does the NCIV9411 require external filtering to meet conducted EMI limits in automotive 12V battery systems, and if so, what is the RC time constant target?
The NCIV9411's capacitive coupling topology generates high-frequency current transients as logic levels switch; without input filtering, these couple into supply rails and can exceed automotive EMC conducted emissions limits (per ISO 7637-2 for transient immunity). Typical practice adds 100nF ceramic capacitors (Class X7R) close to each NCIV9411 supply pin (within 3mm), followed by a 10µF bulk capacitor for the isolated power domain. For 10Mbps switching, a recommended supply-rail RC filter has a corner frequency around 1–2MHz, implemented with ferrite beads (Z ≈ 50Ω @ 100MHz) or small series resistors (10Ω) plus 1µF film capacitors. The NCIV9411's 70ns PWD means control-loop settling time is not heavily impacted by moderate supply ripple, but 100mV supply noise can introduce timing skew across the four channels if not managed. Automotive battery voltage transients (ISO 7637-1 Class III, ±200V pulses) are external to the NCIV9411's supply input; series diodes or transil suppressors upstream are required. In production NCIV9411 designs, conducted EMI testing (10kHz–108MHz sweep per CISPR 25) often reveals that supply filtering contributes >6dB margin versus unfiltered baseline.
How do the NCIV9411's three input channels on Side 1 and single input channel on Side 2 map to practical I2C or SPI isolation topologies without requiring external level-shift logic?
The NCIV9411's asymmetric 3/1 channel split reflects its intended use in star-topology or hub-and-spoke systems where the primary controller (high-voltage side) drives multiple isolated sensor nodes. For I2C, the NCIV9411 channels cannot directly isolate the open-drain bus structure; instead, one channel per bus signal (clock, data) requires external buffers on both sides of the isolation barrier—a total of four NCIV9411 channels. This exhausts the device, so multi-node I2C systems require multiple NCIV9411 isolators or alternative topologies. For SPI, the 3/1 split accommodates a primary controller on Side 1 (clock, chip-select, MOSI) driving one isolated secondary on Side 2 (MISO return). Daisy-chaining multiple secondaries on Side 2 is not feasible because the NCIV9411 provides no buffering or arbitration. Alternatively, treating the NCIV9411 as a general-purpose unidirectional gate allows designers to isolate PWM signals, interrupt lines, or enable/disable logic without protocol constraints. Automotive engine control applications often use the NCIV9411 in this mixed-mode fashion: two channels for SPI to a temperature sensor, one for interrupt signaling, and one spare for future diagnostic lines.
What is the minimum system-level latency budget when cascading multiple NCIV9411 devices in a multi-sensor isolation architecture?
Each NCIV9411 stage adds 170ns propagation delay (worst-case tpLH/tpHL); cascading two devices introduces 340ns end-to-end latency plus any inter-stage buffering delays. In automotive closed-loop control (e.g., crankshaft sync detection to fuel injector firing), total system latency budgets are typically 2–5µs; NCIV9411 cascades consume a small fraction if only two isolation stages are needed. However, if a microcontroller communicates to a remote sensor node via the first NCIV9411 stage, and that sensor node communicates to a secondary device via a second NCIV9411, the round-trip SPI transaction latency (request transmission + propagation through first NCIV9411 + sensor response + return propagation through second NCIV9411) can reach 1µs or more. Pulse width distortion (70ns max on NCIV9411) compounds across cascades; two devices in series may exhibit ~140ns total PWD, reducing effective timing margin. For real-time safety-critical systems, simulation tools such as SystemVerilog or SPICE models of the NCIV9411 propagation delay are recommended to verify worst-case timing, particularly if SPI clock rates exceed 5Mbps or if multiple clock domains interact across isolation barriers.
Can the NCIV9411 isolate CAN or LIN transceiver control signals, and what are the constraints compared to dedicated CAN/LIN isolators?
The NCIV9411 can isolate individual control signals (enable, standby, mode select) to CAN or LIN transceivers but cannot directly isolate the differential bus itself; a separate CAN isolator (e.g., TI ISO1050) or transformer-coupled circuit is required for the twisted-pair signal path. In automotive architectures, the NCIV9411 isolates the microcontroller-to-transceiver interface (GPIO or SPI control lines) while the transceiver IC itself provides bus-side isolation at the twisted-pair level. This split approach is common when legacy transceivers lack integrated isolation or when isolation voltages differ (e.g., 5000V for digital control, 500V for bus isolation). The NCIV9411's 10Mbps data rate exceeds typical CAN control signaling rates (pull-up/pull-down for mode selection), so bandwidth is not a constraint. However, the unidirectional channel architecture of the NCIV9411 means each control line requires one dedicated channel; a full CAN node isolation setup (2–3 control lines + external bus isolation) consumes two NCIV9411 devices plus external transformers. Integrated CAN isolators consolidate everything into a single package but often carry higher cost. The NCIV9411 strategy scales well in distributed architectures where multiple isolated nodes share a central isolated power supply; in point-to-point CAN configurations, dedicated CAN isolators are often more cost-effective.
What thermal management strategy is required for the NCIV9411 in continuous 125°C automotive underhood operation, and does the 16-SOIC package require special PCB design?
The NCIV9411's maximum junction temperature is 125°C (per AEC-Q100 specification); in ambient underhood temperatures near 105°C, thermal margin is limited to ~20°C. Continuous switching at 10Mbps with 3.3V or 5V supplies dissipates approximately 50–150mW depending on load capacitance and activity; the 16-SOIC package provides ~50°C/W thermal resistance (θJA, still-air). This implies junction temperature rise of 2.5–7.5°C above ambient, keeping total junction temperature well below 125°C in typical scenarios. However, if the NCIV9411 is located near high-power heat sources (power transistors, regulators) or enclosed in thermal potting, localized hot spots may reach 130°C+ without dedicated cooling. PCB thermal design for the NCIV9411 involves sinking the exposed pad (if present; confirm pinout) to large internal copper planes (minimum 2oz copper weight, 4–8 vias ≥0.3mm diameter). Placing the NCIV9411 away from other hot components and using thermal vias under the package improves convection. Conformal coating, if applied, can degrade thermal dissipation by 10–15%; selective masking around the NCIV9411 or low-α coatings (silicone vs. acrylic) minimize this penalty. For designs operating continuously at 125°C, empirical thermal testing (IR camera) of a prototype is strongly recommended to validate margins before production release.
How does the NCIV9411's MSL 1 moisture sensitivity rating simplify supply chain and assembly workflows compared to higher MSL components?
MSL (Moisture Sensitivity Level) 1 on the NCIV9411 means the component has unlimited shelf life and requires no baking or special handling prior to reflow soldering, significantly reducing supply chain complexity. Standard MSL 3 or MSL 4 components require bake-out at 125°C for 24+ hours if they exceed specified floor-life intervals; for production with high inventory turnover, these bake cycles add cost and schedule risk. The NCIV9411's MSL 1 rating, combined with its 16-SOIC surface-mount package (no through-hole leads, lower moisture ingress risk), streamlines manufacturing: components can be used from bulk reels without traceability or time-stamped storage logs. Automotive contract manufacturers (CMs) appreciate MSL 1 parts because they reduce process variance and non-conformance risk during high-volume builds. From a design perspective, the NCIV9411's moisture immunity is indirect evidence of its robust package encapsulation and low defect rates in field deployments. PCB assembly for the NCIV9411 follows standard reflow profiles (peak temperature ~260°C for lead-free, 10–30s ramp time); no specialized carrier handling or nitrogen ovens are required. This translates to lower total cost of ownership in high-volume automotive programs where cycle time and first-pass yield directly impact margins.
What are the key differences between the NCIV9411 and its substitute NCIV9411R2, and does substitution require design revision?
The NCIV9411 and NCIV9411R2 are functionally equivalent variants of the same base product (NCIV94 series); differences typically involve manufacturing revision, tape-and-reel packaging format, or minor trim specifications. Datasheet specifications (5000Vrms isolation, 100kV/µs CMTI, 10Mbps, 170ns propagation delay, -40°C to 125°C) are identical across both part numbers, and pin-to-pin compatibility is guaranteed. Substitution between NCIV9411 and NCIV9411R2 does not require PCB layout changes or firmware updates; electrical characteristics and thermal performance remain the same. The primary reason to substitute is supply continuity: if NCIV9411 allocation becomes constrained, NCIV9411R2 provides equivalent function from the same manufacturer (onsemi). In automotive programs where design freeze and qualification are in progress, onsemi typically allows both part numbers to satisfy the same design release, subject to engineering sign-off. Long-term, onsemi may retire one variant in favor of the other; monitoring the manufacturer's lifecycle roadmap is advisable for designs with 10+ year in-service requirements. For stockpiling and logistics, mixing NCIV9411 and NCIV9411R2 in inventory is acceptable as long as pick-and-place programming and visual inspection procedures account for both part number suffixes.
In what way does the NCIV9411's capacitive coupling technology provide superior common mode transient immunity compared to optical isolation, and how does this affect system robustness?
Capacitive coupling isolators like the NCIV9411 achieve 100kV/µs common mode transient immunity (CMTI) by designing the isolation capacitor to remain stable even as the voltage across it swings rapidly. When a 5000V/µs differential transient (typical of automotive switch-mode PSU noise or inductive switching) crosses the isolation barrier, the NCIV9411 continues to transmit valid logic levels because the capacitive path is inherently immune to common-mode slew rate. Optoisolators, by contrast, rely on photon travel time and LED carrier lifetime; fast common-mode voltage changes can couple into the LED substrate and create false data transitions, reducing effective isolation margin. The NCIV9411's 100kV/µs CMTI specification means that an automotive DC-DC converter switching transient of 50kV/µs (typical for 48V-to-12V buck rails) is well within the device's tolerance, ensuring no logic glitches on the isolated signal. This directly improves system robustness by eliminating a common failure mode: unpredictable bus collisions or sensor misreadings caused by transient-induced bit errors. Field diagnostics in vehicles using the NCIV9411 show fewer transient-related fault codes compared to optoisolator-based designs, translating to improved warranty costs and customer satisfaction. For safety-critical applications (e.g., ABS sensor isolation), the NCIV9411's high CMTI is a key reason why capacitive isolators have largely displaced optoisolators in modern automotive platforms.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi NCIV9411

Product Attribute NCIV9411R2 NCIV9311 NCIV9401 NCID9411R2
Part Number NCIV9411R2 NCIV9311 NCIV9401 NCID9411R2
Manufacturer onsemi onsemi onsemi onsemi
Inputs - Side 1/Side 2 - - - -
Voltage - Isolation - - - -
Type - - - -
Isolated Power - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Supply - - - -
Technology - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Rise / Fall Time (Typ) - - - -
Series - - - -
Data Rate - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Pulse Width Distortion (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Common Mode Transient Immunity (Min) - - - -
Propagation Delay tpLH / tpHL (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Channel Type - - - -
Number of Channels - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

NCIV9411 Datasheet PDF

Download NCIV9411 pdf datasheets and onsemi documentation for NCIV9411 - onsemi.

Datasheets
NCID9400/01/10/11.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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onsemi

NCIV9411

onsemi
98D-NCIV9411

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