STMicroelectronics M74HCT32RM13TR

Overview

M74HCT32RM13TR from STMicroelectronics is a high-speed CMOS quad 2-input OR gate in TSSOP-14 package, featuring 13 ns typical propagation delay at 4.5 V, ±4 mA symmetrical output drive, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and 1 µA max quiescent ICC at 25°C - deployed in industrial control logic interfacing and mixed-voltage system level-shifting.

For engineers reviewing the M74HCT32RM13TR datasheet, M74HCT32RM13TR pinout, M74HCT32RM13TR application, or M74HCT32RM13TR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), output impedance balance, operating temperature range (–55°C to +125°C), and TSSOP-14 footprint compatibility with legacy 74-series logic layouts.

Technical Context

The M74HCT32RM13TR implements four independent OR gates using silicon gate C2MOS technology with buffered outputs, enabling high noise immunity and stable switching across wide supply (4.5–5.5 V) and temperature (–55°C to +125°C) ranges. Each gate has identical DC and AC characteristics, including matched tPLH/tPHL delays and symmetrical |IOH|/IOL drive capability.

Input protection circuits guard against ESD and transient overvoltage, while the internal two-stage structure ensures consistent fan-out behavior and low ground bounce. The device directly interfaces HCMOS, TTL, and NMOS logic families without external level shifters due to its 2.0 V VIH min and 0.8 V VIL max thresholds.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.9 × 6.4 mm body, 0.65 mm pitch, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT32PW and 74VHC32FT, the M74HCT32RM13TR delivers superior propagation delay consistency (13 ns typ.), wider –55°C to +125°C qualification, and lower ICC - making it optimal for high-reliability, thermally demanding logic interfacing.

Availability

M74HCT32RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump logic, and test equipment signal conditioning requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for M74HCT32RM13TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The M74HCT32RM13TR belongs to ST's high-speed HCT logic family, engineered specifically for seamless TTL-to-CMOS interfacing in harsh-environment control systems where timing predictability and supply robustness are critical.

FAQ

Is M74HCT32RM13TR pin-compatible with standard 74LS32?

Yes - it is functionally and physically pin-compatible with the 74LS32 in TSSOP-14, sharing identical pin numbering (1A–4A, 1B–4B, 1Y–4Y, GND, VCC). Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive (±4 mA) match LS-TTL specifications, enabling drop-in replacement without layout changes.

What is the maximum recommended input rise/fall time?

The datasheet specifies tr/tf ≤ 500 ns over the full operating temperature range (–55°C to +125°C) at VCC = 4.5–5.5 V. For guaranteed AC performance (e.g., 13 ns tPD), input edges should be ≤ 6 ns per the AC test condition - slower edges increase propagation delay variance and may induce metastability in synchronous systems.

Does M74HCT32RM13TR support partial power-down or I/O isolation?

No - the device lacks Ioff or power-down modes. When VCC = 0 V, inputs and outputs are not high-impedance; VI and VO ratings remain –0.5 V to VCC + 0.5 V, so applying signals during power-off risks latch-up or damage. External isolation switches or bus-hold circuits are required for hot-swap or partial-power scenarios.

Can M74HCT32RM13TR drive a 50 pF load at 10 MHz reliably?

Yes - with CL = 50 pF and fIN = 10 MHz, average ICC(opr) = 39 pF × 5 V × 10 MHz + 0.25 µA ≈ 1.95 mA per package, well within the 50 mA absolute max ICC rating. Output transition times (8–23 ns) and drive strength (±4 mA) ensure clean edges and adequate setup/hold margins at this frequency.