STMicroelectronics 74VHC32TTR

Overview

74VHC32TTR from STMicroelectronics is a quad 2-input OR gate in TSSOP-14 package, operating across 2V–5.5V supply, delivering 3.8 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, and 2 kV ESD immunity. It interfaces 5V and 3V logic systems with input tolerance up to 7V independent of VCC.

For engineers reviewing the 74VHC32TTR datasheet, 74VHC32TTR pinout, 74VHC32TTR application, or 74VHC32TTR equivalent, key selection criteria include rail-to-rail input voltage acceptance (0–7V), power-down input protection, balanced tPLH/tPHL delays, low ICC (2 µA max), and TSSOP-14 thermal and board-space advantages over SO-14.

Technical Context

The 74VHC32TTR implements four independent OR gates using sub-micron C2MOS technology with buffered outputs, enabling high noise immunity (VNIH/VNIL ≥28% VCC) and latch-up robustness. Its input structure accepts 0–7V regardless of VCC, supporting mixed-voltage domain interfacing without level shifters.

All inputs feature power-down protection and diode clamping; outputs provide symmetrical sourcing/sinking (≥8 mA) with low dynamic noise (VOLP ≤0.8 V). The device meets industrial temperature range (–55°C to +125°C) and supports 15 pF/50 pF AC load conditions per JEDEC standards.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.05 mm max height, lead-free and 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 SN74LVC32APW and 74AHC32PW, the 74VHC32TTR uniquely supports 0–7V inputs independent of VCC and retains input protection with VCC = 0 - making it the only choice for legacy 5V/3V coexistence, hot-plug detection, and safety-critical OR logic in variable-supply environments.

Availability

74VHC32TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump safety logic, and POS terminal keypad scan matrices requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74VHC32TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74VHC series targets high-speed, low-power CMOS logic replacement for legacy 74-series devices, emphasizing voltage flexibility, robustness, and drop-in compatibility in space-constrained industrial and automotive control applications.

FAQ

Can 74VHC32TTR safely interface a 5V sensor to a 3.3V microcontroller?

Yes. Its inputs accept 0–7V regardless of VCC, so a 5V sensor output can directly drive an input while VCC = 3.3V. No level shifter is needed, and internal clamping diodes prevent damage. Output VOH will be ~3.3V, compatible with 3.3V MCU inputs.

Does 74VHC32TTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be tied to VCC or GND, but due to its power-down protection and high-impedance inputs at all VCC states, floating inputs are electrically safe - though tying them is still recommended for noise immunity in high-EMI environments.

What is the maximum capacitive load this device can drive reliably?

The datasheet specifies AC performance up to 50 pF load capacitance with guaranteed tPLH/tPHL. For loads exceeding 50 pF, propagation delay increases linearly; design margin should include trace + probe + input capacitance. Total node capacitance >75 pF may require buffer staging.

Is 74VHC32TTR pin-compatible with standard 74LS32 or 74HC32?

Yes - it is functionally and pinout-compatible with 74-series 32 devices in TSSOP-14. However, unlike 74LS32, it operates down to 2V and draws µA-level quiescent current; unlike 74HC32, it supports 7V-tolerant inputs and improved latch-up immunity per JESD78 Class II.