onsemi MC74HC32ADT

Overview

MC74HC32ADT from ON Semiconductor is a quad 2-input OR gate in TSSOP-14 package, operating across 2.0–6.0 V supply, delivering 10 LSTTL load drive capability, with propagation delay as low as 13 ns at 6.0 V and input leakage ≤±1.0 µA - used for logic-level signal combining in industrial control and embedded interface circuits.

For engineers reviewing the MC74HC32ADT datasheet, pinout, applications, or equivalent options, this page provides verified pin mapping, real-world timing and drive specifications, JEDEC-compliant noise immunity data, and validated alternative options for OR gate replacement in space-constrained PCB designs.

Technical Context

The MC74HC32ADT implements four independent CMOS OR gates (Y = A + B) using high-performance silicon-gate technology, with inputs compatible to both standard CMOS and LSTTL (with pullups). Its architecture ensures rail-to-rail output swing and high noise immunity per JEDEC Std. 7A.

It operates over –55°C to +125°C, supports 50 pF capacitive loads, and exhibits guaranteed tPLH/tPHL ≤19 ns at 4.5 V and ≤13 ns at 6.0 V - enabling reliable use in mixed-voltage digital systems requiring fast, deterministic logic decisions.

Key Specifications

Pinout & Package

TSSOP-14 (DT suffix, Case 948G), 4.9 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, Pb-free, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar OR gate applications.

Compared with SN74HC32PWR and 74HC32D,118, the MC74HC32ADT offers identical OR functionality in a smaller TSSOP-14 package with ON Semiconductor's extended temperature grade (–55°C to +125°C), making it optimal for compact, thermally demanding industrial edge nodes where pinout compatibility with LS32 is required.

Availability

MC74HC32ADT is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device UI subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MC74HC32ADT 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

ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient electronics, with leadership in automotive, industrial, cloud power, and sensing solutions.

The MC74HC32ADT belongs to the 74HC logic family - designed for high-speed, low-power CMOS replacement of legacy TTL logic in space- and power-constrained embedded systems.

FAQ

What is the maximum operating temperature range for the MC74HC32ADT?

The MC74HC32ADT is rated for operation from –55°C to +125°C across all package types, including the TSSOP-14 variant. This full industrial temperature range is confirmed in the Recommended Operating Conditions table (page 3 of the datasheet) and validated through temperature cycling and parametric testing - ensuring reliability in under-hood automotive or factory-floor control cabinet environments where the MC74HC32ADT may be deployed.

Does the MC74HC32ADT support direct interface with LSTTL outputs?

Yes, the MC74HC32ADT inputs are compatible with LSTTL outputs when pullup resistors are used, as explicitly stated in the device overview. Its input thresholds (VIH ≥ 3.15 V at 4.5 V) and noise immunity meet JEDEC Std. 7A, allowing direct connection to 5 V LSTTL sources without level shifters - a key design advantage confirmed in the "Features" section and Functional Table of the MC74HC32ADT datasheet.

What is the propagation delay of the MC74HC32ADT at 3.3 V supply?

At VCC = 3.0 V, the MC74HC32ADT guarantees tPLH/tPHL ≤ 40 ns (over temperature), per the AC Characteristics table (page 4). This value is measured with CL = 50 pF and input rise/fall times ≤6 ns. The MC74HC32ADT maintains consistent performance down to 2.0 V, where delay increases to ≤95 ns - critical for low-voltage portable designs relying on the MC74HC32ADT for signal conditioning.

Is the MC74HC32ADT pin-compatible with the obsolete 74LS32?

Yes, the MC74HC32ADT is explicitly stated to be identical in pinout to the 74LS32, as noted in the first sentence of the datasheet overview. All 14 pins - including VCC (pin 14), GND (pin 7), and the four OR gate input/output pairs - match exactly. This allows direct PCB replacement of 74LS32 in existing designs without layout modification, preserving signal integrity while upgrading to CMOS power efficiency and noise immunity in the MC74HC32ADT.

What package type does the MC74HC32ADT use, and what are its key mechanical dimensions?

The MC74HC32ADT uses the TSSOP-14 package (DT suffix, Case 948G), measuring 4.9 mm × 4.4 mm × 1.2 mm with 0.65 mm lead pitch. Key dimensions include body width (B) 4.30–4.50 mm, overall length (A) 4.90–5.10 mm, and seating plane height (C) up to 1.20 mm - all specified in the Package Dimensions drawing (page 7). These compact metrics make the MC74HC32ADT suitable for high-density layouts where the physical footprint of the MC74HC32ADT directly impacts board area utilization.