onsemi MC74HC32ANG

Overview

MC74HC32ANG from onsemi is a quad 2-input OR gate in high-performance silicon-gate CMOS technology, operating across 2.0–6.0 V supply voltage, delivering 10 LSTTL load drive capability and propagation delay as low as 13 ns at 6.0 V, used for digital logic combining, enable gating, and signal arbitration in industrial control and instrumentation systems.

For engineers reviewing the MC74HC32ANG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-14 package mapping, confirmed DC/AC electrical parameters, and real-world use context - all extracted from onsemi's official Rev. 14 datasheet (May 2024).

Technical Context

The MC74HC32ANG implements four independent OR logic functions (Y = A + B) using standard CMOS transistor-level design with rail-to-rail input compatibility and TTL-level output drive. It features symmetrical AC timing behavior with matched tPLH/tPHL and tTLH/tTHL characteristics across temperature and voltage.

Its inputs tolerate voltages up to VCC + 0.5 V and support direct interfacing with CMOS, NMOS, and TTL families-when pulled up, they meet LSTTL input thresholds; no level-shifting circuitry is required in mixed-logic designs.

Key Specifications

Pinout & Package

MC74HC32ANG is supplied in a 14-pin SOIC-14 (Case 751A) surface-mount package, 8.75 mm × 3.90 mm footprint, 1.75 mm height, with standard 1.27 mm pitch and Pb-free finish (G suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Compared with SN74HC32DR and 74HC32D,118, the MC74HC32ANG offers superior high-temperature stability (40 µA ICC at +125°C), AEC-Q100 qualification readiness via −Q variants, and tighter propagation delay consistency across voltage extremes - making it the preferred choice for mission-critical industrial and automotive subsystems.

Availability

MC74HC32ANG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device manufacturing requiring stable component supply, long-term lifecycle assurance, and traceable Pb-free sourcing.

Supply support for MC74HC32ANG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient, high-reliability components for automotive, industrial, cloud, and medical markets.

The MC74HC32ANG belongs to onsemi's HC-series high-speed CMOS logic family, engineered for drop-in replacement of legacy TTL gates while delivering lower power, wider voltage range, and enhanced noise immunity in space-constrained embedded systems.

FAQ

What logic family does MC74HC32ANG belong to, and how does it differ from TTL equivalents?

The MC74HC32ANG is a high-speed CMOS (HC) logic device, not TTL. It provides identical pinout and functionality to the 74LS32 but operates from 2.0–6.0 V (vs. fixed 5 V for LS), draws significantly less quiescent current (≤40 µA vs. ~10 mA), and offers higher noise immunity. Its inputs are CMOS-compatible and, with pull-up resistors, interface directly to LSTTL outputs - enabling seamless retrofit into existing LS32-based designs without circuit modification.

Does MC74HC32ANG support operation at 3.3 V, and what performance can be expected?

Yes, MC74HC32ANG is fully specified for 3.3 V operation. At VCC = 3.3 V and TA = 25°C, typical propagation delay is 30 ns (max 40 ns), output transition time is 27 ns (max 32 ns), and VOH/VOL remain rail-aligned (≥3.2 V / ≤0.1 V). Input thresholds scale proportionally (VIH ≈ 2.1 V, VIL ≈ 0.9 V), ensuring robust interfacing with 3.3 V microcontrollers and FPGAs.

Is MC74HC32ANG pin-compatible with MC74HCT32A, and can they be interchanged?

Yes, MC74HC32ANG and MC74HCT32A share identical pinout and logic function. However, they differ in input threshold compatibility: MC74HC32ANG inputs require CMOS-level signals (VIH ≥ 70% VCC), while MC74HCT32A accepts TTL-level inputs (VIH = 2.0 V fixed). Interchange is safe only if driving sources match the target device's input specification - mixing them risks logic misreads in mixed-voltage systems.

What is the maximum capacitive load MC74HC32ANG can drive reliably?

MC74HC32ANG is characterized for CL ≤ 50 pF in switching tests (per Figure 3 of the datasheet). Driving heavier loads increases propagation delay and transition time nonlinearly; at 100 pF, tPLH/tPHL degrades by ~40%. For loads > 50 pF, buffer staging or reduced slew-rate design is recommended. The 25 mA output rating applies to DC loading, not AC capacitive drive capability.

How should unused inputs on MC74HC32ANG be handled to ensure reliable operation?

Unused inputs on MC74HC32ANG must be tied to a valid logic level - either VCC or GND - and never left floating. Floating inputs cause increased ICC, erratic output behavior, and potential device overheating due to partial conduction in input-stage transistors. A 10 kΩ pull-up or pull-down resistor is acceptable; direct connection is preferred for lowest noise susceptibility.