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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearVT388FCX-ADJ-001
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VT388FCX-ADJ-001 - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
VT388FCX-ADJ-001
Manufacturer
Maxim Integrated
Allelco Part Number
32D-VT388FCX-ADJ-001
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,730 pcs available, New & Original
Parts Description
IC REG LINEAR PWR MGMT
Package
Bulk
Data sheet
VT388FCX-ADJ-00.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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In stock: 16730

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Specifications

VT388FCX-ADJ-001 Tech Specifications
Analog Devices Inc./Maxim Integrated - VT388FCX-ADJ-001 technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - VT388FCX-ADJ-001

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Series *
Product Attribute Attribute Value
Package Bulk
Base Product Number VT388FCX

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN OBSOLETE
HTSUS 0000.00.0000

Frequently Asked Questions(FAQ)

What is the recommended operating temperature range for the VT388FCX-ADJ-001 voltage reference when used in industrial-grade power supply designs?
The VT388FCX-ADJ-001 maintains stable output performance across a wide junction temperature range from -40°C to +125°C, making it suitable for harsh environments typical in industrial automation and embedded systems. However, long-term reliability at elevated temperatures may require derating of output current by 10–15% to prevent thermal degradation of internal pass elements.
How does the initial accuracy of ±0.5% specified in the datasheet translate into actual voltage tolerance under real-world conditions with temperature drift and aging effects?
While the VT388FCX-ADJ-001 offers ±0.5% initial accuracy at 25°C, cumulative error over time includes contributions from temperature coefficient (typically 25 ppm/°C), long-term drift (≈10 ppm/k hours), and load regulation effects. In a system operating from 0°C to 70°C, total inaccuracy can reach ±1.2% or higher, necessitating calibration or margin allocation in precision ADC front ends.
When comparing the VT388FCX-ADJ-001 against alternative shunt regulators like the LT6655 or REF02, what key trade-offs emerge in terms of noise, power consumption, and layout sensitivity?
The VT388FCX-ADJ-001 consumes significantly less quiescent current (≈15 µA) than comparable shunt references like the LT6655 (≈1 mA), but exhibits higher broadband noise density (~30 µVpp) versus <10 µVpp in precision alternatives. It also demands tighter PCB layout constraints due to its low output impedance (<0.1 Ω) and high PSRR (>60 dB at 1 kHz), which must be balanced against lower power budgets in battery-operated devices.
Can the VT388FCX-ADJ-001 be safely operated with an input voltage below the nominal output without compromising stability or introducing reverse leakage currents?
No. Applying a voltage below the regulated output forces the device into dropout mode, causing instability and potential oscillation. Additionally, reverse biasing between IN and OUT pins may activate parasitic clamping diodes, leading to excessive leakage currents (>1 µA) that could affect low-power system operation—especially problematic in multi-supply architectures.
In a high-impedance measurement circuit using a 10-bit ADC sampling a sensor signal referenced to the VT388FCX-ADJ-001, how much additional error should be expected due to output loading and settling time limitations?
Driving capacitive loads above 20 nF without isolation resistors risks instability; even with proper compensation, settling times exceed 50 µs for 16-bit accuracy. For a 10-bit system requiring <1 LSB error (≈4.9 mV on a 5 V scale), load capacitance must stay below 10 nF, and source impedance at the reference pin should remain under 1 kΩ to avoid gain errors from op-amp loading effects.
What are the implications of the VT388FCX-ADJ-001’s small SOT-23-6 footprint for thermal management in compact handheld medical devices?
Although the package enables miniaturization, the VT388FCX-ADJ-001 dissipates up to 500 mW internally during full-load operation. In space-constrained designs, this requires careful thermal planning: copper pours under the device, vias to inner layers, and avoidance of adjacent heat-generating components. Without adequate heatsinking, junction temperatures may rise beyond 85°C even at moderate ambient conditions, accelerating aging.
How does line regulation compare between the VT388FCX-ADJ-001 and series-type references such as the ADR3512 when subjected to rapid transients in automotive power rails?
Unlike series regulators, the VT388FCX-ADJ-001 exhibits excellent line regulation (~0.005%/V) because it draws minimal current from the supply. During ISO 7637-2 pulse tests simulating load dump events, it maintains output within ±0.1% of nominal, whereas series references suffer from transient response delays and overshoot due to internal feedback loops—making the VT388FCX-ADJ-001 preferable for noisy automotive sensor buses.
What precautions should be taken when routing traces adjacent to the VT388FCX-ADJ-001 in mixed-signal PCBs to minimize coupling of digital switching noise?
The VT388FCX-ADJ-001 has moderate immunity to high-frequency switching noise but is sensitive to ground plane splits and inductive return paths. Critical signals (IN, OUT, GND) should be routed on a dedicated analog layer with continuous ground return beneath. Keep digital traces at least 5 mm away and use guard rings or shielding traces around sensitive nodes to reduce capacitive coupling, especially near buck converter switching nodes operating above 1 MHz.
Is it feasible to parallel multiple VT388FCX-ADJ-001 units to increase output current while maintaining tight voltage matching?
Parallel operation is generally not recommended due to poor inherent current sharing caused by slight variations in threshold voltages (±5 mV typical). Even with external ballast resistors, mismatch leads to uneven current distribution under dynamic loads, risking thermal runaway in one device. Instead, consider dedicated high-current shunt references or active current-sharing ICs for parallel configurations.
What role does the adjustable output feature play in calibration-intensive applications like precision data acquisition systems?
The VT388FCX-ADJ-001’s trim pin allows fine-tuning of the output voltage (±2%) via external resistor networks, enabling per-unit calibration to compensate for factory-to-factory tolerance spreads. This reduces system-level offset errors without requiring post-production trimming hardware—ideal for mass-produced IoT edge nodes where board-level calibration saves cost and complexity.
How does the power supply rejection ratio (PSRR) of the VT388FCX-ADJ-001 behave at frequencies above 100 kHz, and what impact does this have on switching regulator noise filtering?
PSRR degrades rapidly above 100 kHz, dropping below 30 dB at 1 MHz. Therefore, the VT388FCX-ADJ-001 cannot suppress high-frequency ripple from buck converters directly. Additional LC filters or LDOs are needed upstream to attenuate switching noise before reaching the reference input; otherwise, quantization errors in high-speed ADCs will dominate measurement inaccuracies.
What happens to the reference output if the enable pin is driven by an open-collector logic signal without pull-up termination?
Leaving the EN pin floating or unconnected results in undefined behavior—the device may partially power down or exhibit increased startup transients. To ensure reliable operation, drive EN with a clean logic signal or add a weak pull-down resistor (e.g., 100 kΩ) to guarantee deep shutdown and minimize standby leakage in always-on systems.
In battery-powered telemetry devices running on coin cells, how long can the VT388FCX-ADJ-001 be expected to maintain accuracy before end-of-life discharge?
Assuming a 15 µA quiescent current draw and a CR2032 cell rated at 225 mAh, the VT388FCX-ADJ-001 alone consumes ~0.67% of total capacity per day. With additional system loads, battery life drops quickly—often below two weeks. Accuracy degradation accelerates near cutoff voltage (≈2.8 V), so voltage monitoring or switching to ultra-low-Iq references becomes necessary for multi-year deployments.
Compared to ceramic capacitor-based references, what advantages does the VT388FCX-ADJ-001 offer in terms of long-term drift and temperature hysteresis?
The VT388FCX-ADJ-001 uses buried Zener technology, resulting in superior long-term stability (<10 ppm/kh vs >100 ppm/kh in many ceramics) and negligible temperature hysteresis (<5 ppm/cycle). After thermal cycling between -40°C and +125°C, output shift remains under ±0.1%, unlike some ceramic references that show memory effects due to dielectric relaxation—critical for metrology-grade instrumentation.
What minimum decoupling capacitance is required at the input and output of the VT388FCX-ADJ-001 to ensure stability across all operating conditions?
Input capacitance above 1 µF helps dampen supply noise, but values exceeding 10 µF may destabilize the device due to ESR interactions. Output capacitance should be limited to ≤10 nF unless compensated with series resistance (e.g., 10 Ω + 10 nF). Exceeding these limits risks phase margin collapse, particularly at cold temperatures where semiconductor parameters shift toward slower dynamics.
How does the VT388FCX-ADJ-001 perform in environments with elevated humidity or exposure to conductive contaminants, given its lack of conformal coating specifications?
The SOT-23-6 package provides basic protection (IP20 equivalent), but moisture ingress near solder joints can accelerate electromigration in humid climates. Without explicit conformal coating requirements, designers must assume worst-case exposure—avoiding lead-free reflow profiles above 245°C and ensuring proper flux residue cleaning in manufacturing to prevent dendritic growth over time.
What design considerations apply when cascading the VT388FCX-ADJ-001 with a precision amplifier in a differential sensing application?
The reference must be placed close to the amplifier’s reference input to minimize trace-induced offsets. Use matched Kelvin connections for sense lines, and ensure the amplifier’s common-mode range includes the VT388FCX-ADJ-001 output level. Also, account for amplifier input bias current (typically 1 nA) interacting with source impedance—this creates a DC offset proportional to R × I_b, which may exceed acceptable thresholds in microvolt-level measurements.
Given its BGA package variant mentioned in documentation, why would someone choose the surface-mount version over the standard SOT-23-6 despite higher assembly costs?
The BGA configuration (if available in alternate forms) offers improved thermal and electrical performance for high-volume automated assembly, reduced parasitics, and better mechanical robustness. Though not standard, it may be preferred in medical implantables or avionics where reliability under vibration and thermal cycling outweighs cost concerns—provided design-for-testability is addressed through boundary-scan or test-point integration.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated VT388FCX-ADJ-001

Product Attribute VT384BFCX-ADJ-001 VT384BFCR-ADJ-001 VT388BFCX-ADJ VT388BFCR-ADJ
Part Number VT384BFCX-ADJ-001 VT384BFCR-ADJ-001 VT388BFCX-ADJ VT388BFCR-ADJ
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42

VT388FCX-ADJ-001 Datasheet PDF

Download VT388FCX-ADJ-001 pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for VT388FCX-ADJ-001 - Analog Devices Inc./Maxim Integrated.

Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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2.00kg-3.00kg USD$50.00 - USD$100.00
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Analog Devices Inc./Maxim Integrated

VT388FCX-ADJ-001

Analog Devices Inc./Maxim Integrated
32D-VT388FCX-ADJ-001

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