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Product Detailed Parameters
- Description：IC COMPARATOR 2 W/VOLT REF 8SO
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：with Voltage Reference
- Number of Elements：2
- Output Type：Open-Drain
- Voltage - Supply, Single/Dual (±)：2.5V ~ 11V, ±1.25V ~ 5.5V
- Voltage - Input Offset (Max)：10mV @ 5V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：5.7µA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：12µs
- Hysteresis：50mV
- Operating Temperature：-40°C ~ 85°C
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：8-SO
- Grade：-
- Qualification：-
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Overview
The LTC1842IS8#PBF is an ultralow power dual comparator with a built-in 1.182V ±1% reference, housed in an 8-lead SOIC package. It operates from a single 2.5V to 11V supply or dual ±1.25V to ±5.5V supply. The device features a typical quiescent current of 3.5μA and open-drain outputs capable of sinking greater than 20mA. Hysteresis is programmable via the HYST pin using two resistors, allowing for adjustable threshold bands up to 100mV. Input voltage range extends from the negative supply to within 1.3V of the positive supply.
Feature Summary
- Built-in 1.182V precision reference output
- Programmable hysteresis via external resistors
- Open-drain outputs sink over 20mA
- Eliminates cross-conduction current spikes
Applications
- Battery-powered system monitoring
- Threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the 'I' grade designation matches the required -40°C to 85°C operating temperature range. Ensure the 8-SOIC package dimensions align with the target PCB footprint. Cross-reference the manufacturer part number against official Analog Devices documentation to validate authenticity and revision status.
Selection Notes
Select this component when low static current consumption is critical alongside precise voltage referencing. The integrated 1.182V reference eliminates the need for external bandgap sources. Verify that the 2.5V minimum supply voltage meets the system's lowest operational requirement. Consider the open-drain output configuration for necessary level shifting or wire-OR logic capabilities.
Part Context
This part belongs to the LTC1841/LTC1842/LTC1843 family of micropower comparators. While the LTC1841 lacks a reference and the LTC1843 has inverted inputs, the LTC1842 provides noninverting inputs with the internal reference. All variants share identical electrical characteristics regarding speed, power, and packaging.
Replacement Considerations
LTC1842CS8 (Commercial temperature grade)
FAQ
How is hysteresis configured on the LTC1842?
Hysteresis is programmed by connecting two resistors between the REF and HYST pins. The maximum hysteresis voltage band is 100mV.
What is the input voltage range?
The inputs operate from the negative supply (V–) to within 1.3V of the positive supply (V+).
