Texas Instruments LM3302N

Overview

LM3302N from Texas Instruments is a quad voltage comparator IC designed for single- or dual-supply operation across 2 V to 28 V, featuring 0.8 mA typical supply current, 25 nA typical input bias current, and open-collector TTL/MOS/CMOS-compatible outputs. It operates in industrial temperature range (−40°C to 85°C) and supports wired-AND logic configurations in level-shifting, window detection, and threshold-sensing circuits.

For engineers reviewing the LM3302N datasheet, LM3302N pinout, LM3302N application, or LM3302N equivalent, key selection considerations include its rail-to-rail differential input range (±28 V), ground-inclusive common-mode input (0 V to VCC−2 V), low 3 mV typical input offset voltage, and 1.3 µs response time with 100-mV input step - critical for precision analog monitoring and fast digital interface conditioning.

Technical Context

The LM3302N integrates four independent comparators with internal 80-µA current regulation per channel, enabling stable performance across wide supply variations. Its input stage allows common-mode voltages down to ground and differential inputs up to ±28 V, supporting direct sensing of signals referenced to system ground or floating sources.

Each comparator features an open-collector output capable of sinking up to 16 mA, compatible with TTL, MOS, and CMOS logic families. The output stage lacks internal pull-up, requiring external termination to define high-level voltage and logic polarity - essential for flexible interfacing in mixed-voltage systems.

Key Specifications

Pinout & Package

LM3302N is housed in a 14-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 80°C/W, supporting operation up to 85°C ambient without forced cooling in typical PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad comparator applications.

Compared with LM3302N, LM339N trades precision and speed for legacy compatibility and lower cost, while TLV3704IPW offers modern specs at the expense of pinout compatibility - making LM3302N optimal for upgrades where existing PDIP layout and 28 V differential input are critical.

Availability

LM3302N is available at Aetrix Electronics and suitable for overvoltage protection, temperature threshold monitoring, power supply sequencing, and digital logic level translation requiring stable component supply across industrial and automotive OEM programs.

Supply support for LM3302N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog IC design.

The LM3302N belongs to TI's legacy analog comparator product line, engineered for robust performance in industrial control, power management, and signal conditioning applications where reliability across wide voltage and temperature ranges is essential.

FAQ

What supply voltage range does the LM3302N support?

The LM3302N operates from a single supply of 2 V to 28 V or dual supplies with a total difference of 2 V to 28 V. Its design allows the positive supply (VCC) to be at least 1.5 V more positive than the input common-mode voltage. This wide range makes LM3302N suitable for both low-voltage portable devices and 24 V industrial systems without external regulation.

Does the LM3302N have rail-to-rail input capability?

The LM3302N does not provide full rail-to-rail input - its common-mode input voltage range extends from ground (0 V) to VCC−2 V at −40°C to 85°C. While it accepts signals down to ground, it cannot reliably sense inputs within 2 V of the positive rail. This limitation is inherent to its bipolar input stage and must be accounted for in voltage-divider design when using LM3302N.

Can the LM3302N outputs be wired together?

Yes, the LM3302N features open-collector outputs that support wired-AND connections. When multiple outputs are tied together with a shared pull-up resistor, the combined node goes LOW if any comparator asserts - enabling simple priority encoding or fault-bus architectures. This functionality is explicitly supported in the LM3302N datasheet and requires no additional components beyond the external pull-up.

What is the maximum differential input voltage for the LM3302N?

The LM3302N supports a maximum differential input voltage of ±28 V, meaning the voltage difference between IN+ and IN− can safely reach 56 V peak-to-peak. This specification is independent of supply voltage and allows direct comparison of signals across large potential differences - such as detecting overvoltage on a 24 V bus relative to ground using LM3302N without attenuators.

Is the LM3302N RoHS compliant?

Yes, the LM3302N is RoHS compliant and green (halogen-free), as confirmed in TI's Package Option Addendum dated February 2020. It uses NiPdAu lead finish and meets EU RoHS requirements for all 10 restricted substances, including ≤1000 ppm bromine and chlorine content - making LM3302N suitable for environmentally regulated industrial and automotive production.