LTC1042MJ8

Overview

The LTC1042MJ8 is a monolithic CMOS window comparator manufactured using Linear Technology’s enhanced LTCMOS silicon gate process. It features two high-impedance voltage inputs, CENTER and WIDTH/2, which define the middle and width of the comparison window. The device provides TTL-compatible outputs: WITHIN WINDOW (high when VIN is inside the window) and ABOVE WINDOW (high when VIN exceeds the upper limit). By interchanging VIN and CENTER, the ABOVE WINDOW output functions as BELOW WINDOW. The sampling technique ensures non-interacting inputs and chopper stabilization for high accuracy across temperature, supply, and input ranges.

Feature Summary

• Chopper-stabilized architecture providing extremely high accuracy over all conditions of temperature, power supply, and input voltage range
• Non-interacting inputs allowing independent adjustment of window center and width without affecting each other
• High impedance voltage inputs capable of common mode operation to both supply rails (V+ and GND)
• Micropower consumption achieved through internal strobing that powers comparators only during the 80µs sampling cycle

Applications

• Fault Detectors
• Go/No-Go Testing
• Microprocessor Power Supply Monitor

Procurement Notes

Verify the specific suffix MJ8 against current manufacturer documentation to confirm package type and operating temperature range specifications. Confirm availability status as the N8 package is noted as an alternate source while the J8 package may be obsolete. Ensure design-in compatibility with required supply voltages and sampling frequencies before finalizing procurement decisions.

Selection Notes

Select this component when precise window detection with minimal power consumption is required. The LTC1042MJ8 offers wide supply range capability from 2.8V to 16V and high accuracy with center error up to ±1mV max. Consider the external RC network requirements for setting sampling frequency if self-strobing is utilized. Evaluate input source resistance limitations to ensure accurate voltage sensing within specified error bounds.

Part Context

The LTC1042 series includes variants such as LTC1042CN8 and LTC1042MJ8. The MJ8 designation typically corresponds to the military or extended temperature grade in the 8-lead CERDIP package. This part belongs to the window comparator category, distinct from standard operational amplifiers or single comparators, offering dual-output logic states for precise voltage band monitoring.

Replacement Considerations

The N8 package (PDIP) is listed as an alternate source for the LTC1042. Verify pinout compatibility and thermal characteristics when substituting between ceramic and plastic DIP packages. No direct cross-brand replacements are confirmed in the provided datasheet.