Diodes Incorporated 74AHCT1G32SE-7

Overview

74AHCT1G32SE-7 from Diodes Incorporated is a single 2-input positive OR gate in SOT353 package, operating at 4.5V–5.5V supply, delivering ±8 mA output drive at 5.0 V, with Schmitt-trigger inputs for noise immunity, and RoHS-compliant lead-free finish. It implements the Boolean function Y = A + B in general-purpose logic applications such as PC peripherals and set-top box control circuitry.

For engineers reviewing the 74AHCT1G32SE-7 datasheet, 74AHCT1G32SE-7 pinout, 74AHCT1G32SE-7 application, or 74AHCT1G32SE-7 equivalent, key selection criteria include input hysteresis tolerance, propagation delay under 9.0 ns (CL = 50 pF), output drive capability at 5 V, and compatibility with TTL-level input thresholds in mixed-voltage digital systems.

Technical Context

This device belongs to the AHCT logic family, offering TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) while maintaining CMOS power efficiency. Its Schmitt-trigger inputs provide hysteresis (typ. 0.4 V), enabling robust operation with slow-rising or noisy signals.

The gate uses standard totem-pole output structure, supporting rail-to-rail switching with VOH ≥ 3.70 V and VOL ≤ 0.55 V at IOL/IOH = ±8 mA. Thermal resistance θJA is 371 °C/W in SOT353, requiring attention to PCB copper area in high-duty-cycle applications.

Key Specifications

Pinout & Package

SOT353 (5-pin small outline transistor) package: ultra-compact surface-mount footprint (2.2 mm × 1.35 mm × 0.95 mm), lead-free, green molding compound, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT1G32DBVR and 74LVC1G32GW,125, the 74AHCT1G32SE-7 uniquely balances ultra-small SOT353 size, Schmitt-trigger noise rejection, and strict 5 V TTL compatibility-making it optimal for space-constrained consumer electronics where signal integrity on long traces matters.

Availability

74AHCT1G32SE-7 is available at Aetrix Electronics and suitable for PC peripherals, set-top boxes, hard disk drive controllers, and MP3 player power management requiring stable component supply and long-term industrial availability.

Supply support for 74AHCT1G32SE-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The AHCT logic family targets 5 V systems needing TTL-compatible interfacing with CMOS power efficiency, specifically designed for cost-sensitive, high-volume digital glue logic in consumer electronics.

FAQ

Is the 74AHCT1G32SE-7 compatible with 3.3 V input signals?

No. Its input thresholds are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), optimized for 5 V systems. A 3.3 V logic high may not reliably register as valid high input across temperature and voltage extremes. Level-shifting is recommended for mixed-voltage interfacing.

What is the maximum capacitive load this OR gate can drive while meeting timing specs?

The datasheet guarantees tpd ≤ 9.0 ns with CL = 50 pF at VCC = 5 V. Driving >50 pF increases delay nonlinearly and may cause marginal timing; for loads above 50 pF, add a buffer stage or reduce trace length and stubs.

Does the Schmitt-trigger input affect the truth table or logic function?

No. The Schmitt-trigger action only modifies input threshold behavior (adding hysteresis), not the underlying OR logic function. The truth table remains unchanged: Y = A + B. Hysteresis improves noise margin but does not alter Boolean output states.

Can unused inputs be left floating?

No. Per datasheet Note 3, unused inputs must be tied to VCC or GND. Floating inputs risk oscillation, increased ICC, and ESD susceptibility due to undefined biasing of the Schmitt-trigger input stage.