English
中文 English
Language English

LM3302N Datasheet Deep Dive: Specs & Pinout Revealed

30

The LM3302N is a quad, low‑offset comparator designed for mixed-signal monitoring. Featuring a typical input offset near 20 mV and sub-microamp bias currents, it excels in compact comparator arrays where tight threshold accuracy and low leakage are critical for system performance.

IN+ IN- OUT VCC GND Comparator Logic (1 of 4)

LM3302N — Quick technical overview

LM3302N Technical Overview Schematic

Application Scope

The device is a quad comparator family with low offset characteristics suited for precision threshold detection. This makes it attractive for window comparators, multi‑channel monitors, and low‑power sensor interfaces where input leakage directly affects accuracy.

Pinout & Pin Functions Breakdown

PinNameFunction
1OUT AComparator A output
2IN A−Comparator A inverting input
3IN A+Comparator A non‑inverting input
7V− (GND)Negative supply / ground
14V+Positive supply

Electrical Specifications

SpecTypicalUnit
Input offset voltage~20mV
Input bias current<1µA
Usable supply range0 to 28V

Design & Integration Guide

To reduce noise susceptibility, place a 0.1 µF ceramic decoupler close to the V+ pin. Keep input traces short and shielded. For noisy environments, implementing hysteresis via a feedback resistor is mandatory to prevent output chatter.

Summary

  • 4-channel low-offset comparator optimized for ground-sensing applications.
  • Supports wide supply range up to 28V with sub-microamp input bias.
  • Requires open-collector pull-up resistors for output logic interfacing.
1. What are the key parameters to check first in the LM3302N datasheet?
Start with supply limits, input common‑mode range, input offset and input bias. These define whether the comparator can see your signal and how much error to budget.
2. How should I verify the pinout on a new board before applying full power?
Use continuity checks to confirm pin mapping against CAD, apply a limited current power source to V+, and verify ground before applying high-voltage signals.
3. What is a quick fix for noisy comparator switching seen on the bench?
Add hysteresis by inserting a small feedback resistor, tighten decoupling (0.1 µF at V+), and consider adding a small RC filter to the input.
4. When should I choose LM3302N over other comparators?
Choose it for multi-channel monitoring requiring ground-sensing and low leakage; avoid it if you require rail-to-rail inputs or ultra-fast switching speed.