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Product Detailed Parameters
- Description：IC COMPARATOR 1 W/VOLT REF 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：with Voltage Reference
- Number of Elements：1
- Output Type：CMOS, TTL
- Voltage - Supply, Single/Dual (±)：2V ~ 11V, ±1V ~ 5.5V
- Voltage - Input Offset (Max)：10mV @ 5V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：40mA
- Current - Quiescent (Max)：4.4µA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：15µs
- Hysteresis：50mV
- Operating Temperature：-40°C ~ 85°C
- Package / Case：8-WFDFN Exposed Pad
- Mounting Type：Surface Mount
- Supplier Device Package：8-DFN (3x3)
- Grade：-
- Qualification：-
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Overview
The LTC1440IDD#TRPBF is an ultralow power single comparator with a built-in 1.182V reference, housed in an 8-lead DFN package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device features programmable hysteresis via the HYST pin and TTL/CMOS outputs capable of sourcing up to 40mA. Supply current is typically 2.1µA at 5V and 4.4µA over the industrial temperature range (-40°C to 85°C). Propagation delay is 12µs with 10mV overdrive.
Feature Summary
- Built-in 1.182V bandgap reference output that can drive a bypass capacitor without oscillation
- Programmable hysteresis using external resistors connected to the HYST pin
- Glitch-free CMOS output stage eliminates cross-conducting currents during logic state transitions
- Wide input common mode range extending from the negative supply to within 1.3V of the positive supply
Applications
- Battery-powered system monitoring
- Micropower threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific suffix #TRPBF indicates tape and reel packaging and lead-free compliance. Confirm the IDD suffix corresponds to the industrial temperature grade (-40°C to 85°C) and the DD package style. Ensure the ordering part number matches the required quantity per reel as specified in the manufacturer's documentation.
Selection Notes
Select this component for applications requiring minimal quiescent current alongside a stable internal voltage reference. The DFN package offers a compact footprint suitable for space-constrained designs. Consider the 40mA output source capability if direct driving of loads is necessary without additional buffering circuitry.
Part Context
This device belongs to the LTC1440/LTC1441/LTC1442 family of micropower comparators. While the LTC1441 and LTC1442 are dual variants, the LTC1440 is a single comparator configuration. The family shares similar electrical characteristics regarding supply range and reference accuracy, differing primarily in channel count and package availability.
Replacement Considerations
The datasheet identifies the MAX921, MAX922, and MAX923 as pin-compatible upgrades. Verify pinout compatibility and electrical specifications against these specific Maxim Integrated parts before substitution.
