Texas Instruments SN74AHCT1G32DBVR

Overview

SN74AHCT1G32 from Texas Instruments is a single 2-input positive-OR gate IC operating at 4.5 V–5.5 V, delivering 8 ns max propagation delay at 5 V, ±8 mA output drive, TTL-compatible inputs, and 10 µA max supply current. It performs Boolean Y = A + B in positive logic and is used in I/O modules, server motherboards, and automotive clusters for level translation and bus interface logic.

For engineers reviewing the SN74AHCT1G32 datasheet, SN74AHCT1G32 pinout, SN74AHCT1G32 application, or SN74AHCT1G32 equivalent, key selection criteria include its 5-pin SOT-23 (DBV) package, −40°C to +125°C operating range, latch-up immunity >250 mA, and compatibility with 3.3 V input signals driving 5 V logic systems.

Technical Context

The SN74AHCT1G32 implements a non-inverting OR function using CMOS technology with TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V), enabling direct interfacing between 3.3 V and 5 V domains. Its inputs remain high-impedance when VCC = 0 V, supporting hot-insertion scenarios.

It features slow output edge rates (20 ns/V input transition rate) to suppress ringing on light loads, and balanced totem-pole outputs capable of sourcing/sinking 8 mA at 5 V while maintaining VOL ≤ 0.44 V and VOH ≥ 3.8 V under load.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin plastic package, 2.90 mm × 2.80 mm footprint, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel packaging (3000 units/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G32DBVR and MC74VHC1G32DTT1G, the SN74AHCT1G32DBVR uniquely guarantees TTL input compatibility at 5 V while maintaining pinout and thermal performance in the industry-standard SOT-23 package - critical for drop-in replacement in legacy 5 V systems.

Availability

SN74AHCT1G32DBVR is available at Aetrix Electronics and suitable for industrial I/O modules, automotive instrument clusters, and server motherboard management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74AHCT1G32DBVR 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 company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.

The SN74AHCT1G32 belongs to TI's advanced high-speed CMOS (AHCT) logic family, designed specifically for 5 V systems requiring TTL compatibility, low power, and robust operation in automotive and industrial environments.

FAQ

What logic function does the SN74AHCT1G32DBVR implement?

The SN74AHCT1G32DBVR implements a single 2-input positive-OR gate function, performing Y = A + B in positive logic. It accepts two independent inputs (A and B), produces one active-high output (Y), and operates strictly as combinational logic with no internal storage or enable control. This behavior is confirmed in the device functional table and logic diagram within the official SN74AHCT1G32 datasheet.

Can the SN74AHCT1G32DBVR interface directly with 3.3 V microcontrollers?

Yes, the SN74AHCT1G32DBVR can interface directly with 3.3 V microcontrollers because its inputs are TTL-voltage compatible, with VIH = 2.0 V min and VIL = 0.8 V max at 5 V supply. A 3.3 V logic high from a microcontroller exceeds the 2.0 V VIH threshold, ensuring reliable recognition as a logic HIGH. This capability is explicitly stated in the Features and Recommended Operating Conditions sections of the SN74AHCT1G32 datasheet.

What is the maximum operating temperature for the SN74AHCT1G32DBVR?

The SN74AHCT1G32DBVR is rated for operation from −40°C to +125°C, as specified in the Recommended Operating Conditions table of the datasheet. This extended temperature range qualifies it for use in automotive clusters and industrial motor drives where ambient temperatures exceed standard commercial limits. The rating applies specifically to the DBV (SOT-23) package variant.

Does the SN74AHCT1G32DBVR require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs of the SN74AHCT1G32DBVR must be held at a defined logic level - either VCC or GND - to prevent floating states that could cause excessive supply current or erratic output behavior. This requirement is mandated in Section 5.3 and elaborated in Application Report SCBA004, referenced in the SN74AHCT1G32 datasheet.

Is the SN74AHCT1G32DBVR pin-compatible with other 5-pin logic gates in SOT-23 packages?

The SN74AHCT1G32DBVR uses the standard 5-pin SOT-23 (DBV) pinout defined by JEDEC MO-178: Pin 1 = A, Pin 2 = B, Pin 3 = GND, Pin 4 = Y, Pin 5 = VCC. This matches the pin configuration of other TI single-gate logic devices in DBV packages (e.g., SN74AHCT1G00, SN74AHCT1G08), enabling direct PCB footprint reuse across functionally distinct gates.