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HomeProductsIntegrated Circuits (ICs)Specialized ICsLTC1440IN8
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LTC1440IN8 - Linear Technology / Analog Devices

Manufacturer Part Number
LTC1440IN8
Manufacturer
Linear Technology
Allelco Part Number
32D-LTC1440IN8
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,600 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 6600

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Specifications

LTC1440IN8 Tech Specifications
Linear Technology / Analog Devices - LTC1440IN8 technical specifications, attributes, parameters and parts with similar specifications to Linear Technology / Analog Devices - LTC1440IN8

Product Attribute Attribute Value
Part Number LTC1440IN8
Package DAC91001
Description DAC91001
Stock Condition Get 6600 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Linear Technology
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

What are the key operational characteristics of the LTC1440IN8 that differentiate it from general-purpose comparators in precision sensing applications?
The LTC1440IN8 features a low input offset voltage of ±500µV and a supply current of just 35µA typical, making it suitable for battery-powered systems requiring high accuracy over temperature. Its rail-to-rail input stage allows signal monitoring near ground or the positive rail, which is critical in low-voltage designs where headroom is limited. Additionally, the internal hysteresis (~1.5mV) reduces output chatter in noisy environments without requiring external components.
How does the propagation delay of the LTC1440IN8 compare to similar micropower comparators, and what implications does this have for real-time control loops?
The LTC1440IN8 has a propagation delay of approximately 4.5µs under a 5mV overdrive condition, which is notably faster than many ultra-low-power comparators that trade speed for current efficiency. This balance enables responsive behavior in supervisory circuits or window detection tasks where delayed switching could compromise system safety or efficiency.
Can the LTC1440IN8 operate reliably with a single 3.3V supply in industrial temperature environments?
Yes, the LTC1440IN8 is fully specified for operation from 2.7V to 11V single supply and maintains functionality across the industrial temperature range (-40°C to +85°C). At 3.3V, its common-mode input range includes both rails, allowing direct interface with low-voltage logic levels and analog signals from sensors or dividers without level shifting.
What design considerations should be taken into account when using the LTC1440IN8 in a window comparator configuration for overvoltage/undervoltage protection?
When configuring the LTC1440IN8 in a window comparator setup, ensure that the reference voltages are stable and derived from low-noise sources, as the device’s high gain can amplify small reference fluctuations. The open-drain output requires pull-up resistors sized to balance rise time and power consumption—typically 10kΩ to 100kΩ depending on switching frequency. Also, layout symmetry between the two comparator inputs helps minimize offset mismatches due to thermal gradients.
How does the output stage of the LTC1440IN8 influence interface compatibility with CMOS and TTL logic families?
The LTC1440IN8 features an open-drain output that can be pulled up to a voltage higher than VCC (up to 11V), enabling level translation between low-voltage analog domains and higher-voltage digital logic. This flexibility allows direct interfacing with both 3.3V CMOS and 5V TTL inputs without additional buffering, provided the pull-up voltage matches the target logic level.
In noise-sensitive applications, how effective is the internal hysteresis of the LTC1440IN8, and when might external hysteresis be necessary?
The built-in hysteresis of ~1.5mV in the LTC1440IN8 is sufficient for rejecting moderate noise in clean environments, such as temperature monitoring with thermistor dividers. However, in high-noise settings like motor drives or switch-mode power supplies, external hysteresis via positive feedback may be required to increase noise immunity beyond 10mV, ensuring reliable switching thresholds.
What are the thermal and layout implications of using the LTC1440IN8 in a densely populated DIP8 board assembly?
The DIP8 package of the LTC1440IN8 provides moderate thermal resistance (θJA ≈ 130°C/W), so self-heating is minimal given its low quiescent current. However, in dense layouts, thermal coupling from adjacent power components can shift the local ambient temperature, potentially affecting offset voltage drift. Maintaining adequate spacing and using ground planes beneath the device helps stabilize performance.
How does the LTC1440IN8 perform in terms of long-term stability and drift compared to other precision comparators in its class?
The LTC1440IN8 exhibits typical input offset voltage drift of 2µV/°C, which is competitive among micropower comparators. Over the full industrial range, this results in a maximum offset shift of ~250µV, making it suitable for applications requiring stable threshold detection over time and temperature, such as battery management or sensor monitoring systems.
Is the LTC1440IN8 suitable for use in zero-crossing detection circuits with AC line monitoring?
While the LTC1440IN8 can detect zero crossings due to its rail-to-rail inputs and fast response, care must be taken with input protection when interfacing with high-voltage AC signals. A resistive divider and clamping diodes are typically required to limit input voltage within the safe operating area. The device’s low input bias current (<1nA) minimizes loading on high-impedance dividers, preserving accuracy.
What trade-offs exist between power consumption and response time when selecting the LTC1440IN8 over higher-speed comparators?
The LTC1440IN8 prioritizes ultra-low power (35µA) over speed, resulting in a propagation delay that is slower than high-performance comparators (e.g., <100ns types). This makes it less ideal for high-frequency signal processing but highly effective in energy-constrained, event-driven systems like wake-up circuits or periodic monitoring where average power dominates design goals.
How does the input common-mode range of the LTC1440IN8 affect its use in ground-referenced and floating sensor applications?
The LTC1440IN8 accepts inputs from below ground to above VCC (by 0.3V), enabling direct monitoring of signals referenced to system ground or floating sources like shunt resistors in high-side current sensing. This eliminates the need for level-shifting amplifiers in many configurations, simplifying design and reducing component count.
What precautions should be taken when placing the LTC1440IN8 near switching regulators or digital circuits on the same PCB?
Due to its high gain and sensitivity to input transients, the LTC1440IN8 should be isolated from high-di/dt traces using ground guards and short input paths. Decoupling capacitors (0.1µF ceramic) placed close to the VCC and GND pins suppress supply-borne noise. Additionally, routing comparator inputs away from clock lines or switch nodes minimizes capacitive coupling that could trigger false outputs.
Can the LTC1440IN8 be used in a Schmitt trigger oscillator circuit, and what frequency range is realistically achievable?
Yes, the LTC1440IN8 can function in a Schmitt trigger oscillator using an RC network and external positive feedback. With typical hysteresis and propagation delay, oscillation frequencies up to ~50kHz are feasible with standard component values. Higher frequencies are limited by delay and hysteresis window; precise frequency control requires tight tolerance resistors and capacitors.
How does the LTC1440IN8 compare to the LTC1441 in terms of performance and application suitability?
The LTC1440IN8 and LTC1441 are closely related, but the LTC1441 includes an integrated reference voltage (1.182V), whereas the LTC1440IN8 does not. This makes the LTC1440IN8 more flexible for custom threshold applications where external references are preferred, while the LTC1441 simplifies designs needing a fixed trip point. Both share similar power and speed characteristics.
What is the recommended method for minimizing output glitching during power-up when using the LTC1440IN8 in a supervisory role?
During power-up, the LTC1440IN8’s output may glitch if inputs are undefined or floating. To prevent this, tie unused inputs to a valid voltage (e.g., through a resistor to VCC or GND) and ensure the monitored signal stabilizes before the supply reaches the valid operating range. Adding a small RC delay on the output can also mask transient states in critical systems.

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    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

  • Arch***ct
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  • FPGA***lorer88
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    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • 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
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Linear Technology / Analog Devices

LTC1440IN8

Linear Technology / Analog Devices
32D-LTC1440IN8

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