STMicroelectronics 74VHCT08ATTR

Overview

74VHCT08ATTR from STMicroelectronics is a quad 2-input AND gate in TSSOP-14 package, operating at 4.5–5.5 V with 4.7 ns typical propagation delay, ±8 mA output drive, and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). It enables logic-level interfacing between 5 V and 3 V systems in industrial control and embedded timing circuits.

For engineers reviewing the 74VHCT08ATTR datasheet, 74VHCT08ATTR pinout, 74VHCT08ATTR application, or 74VHCT08ATTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), power-down input/output protection, ESD immunity (2 kV), and guaranteed 5 V operation with 2 µA max quiescent current.

Technical Context

This device implements four independent AND gates using sub-micron C2MOS technology with buffered outputs for high noise immunity. Each gate features symmetrical output impedance (|IOH| = IOL ≥ 8 mA) and balanced propagation delays (tPLH ≅ tPHL), supporting clean signal routing in synchronous digital systems.

All inputs accept 0–7 V regardless of VCC, enabling robust hot-swap and mixed-voltage interface capability. Input protection includes diode clamping and 2 kV HBM ESD rating; power-down protection ensures safe operation during supply sequencing or standby modes.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.4 mm × 5.0 mm body, 0.65 mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74VHCT08PW and 74LCX08MTCX, the 74VHCT08ATTR uniquely supports 0–7 V input tolerance and 5 V system integration without level shifters, making it irreplaceable in legacy 5 V industrial and automotive interfaces where voltage translation adds cost and board space.

Availability

74VHCT08ATTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic equipment requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74VHCT08ATTR 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 VHCT logic family targets 5 V systems requiring TTL compatibility, low power, and enhanced robustness - specifically engineered for industrial control, instrumentation, and legacy infrastructure upgrades.

FAQ

Can 74VHCT08ATTR operate safely with 3.3 V inputs while powered at 5 V?

Yes. Its inputs accept 0–7 V regardless of VCC, and TTL-compatible thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) guarantee reliable recognition of 3.3 V logic levels. This enables direct interfacing with 3.3 V microcontrollers without external level shifters.

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

The 74VHCT08ATTR is characterized up to 50 pF (AC specs table), with 4.7 ns tPD at CL = 15 pF and 5.5 ns at CL = 50 pF. For stable operation beyond 50 pF, add series termination or buffer stages to prevent excessive rise/fall time degradation and output ringing.

Does this part support partial power-down (e.g., VCC off while inputs active)?

Yes. Power-down protection ensures inputs and outputs enter high-impedance states with no latch-up or leakage when VCC = 0 V. Inputs tolerate up to 7 V during this condition, enabling safe hot-swap and supply sequencing in modular systems.

How does its ESD performance compare to standard 74HC devices?

With 2 kV HBM ESD rating, the 74VHCT08ATTR exceeds typical 74HC devices (often 2 kV HBM but unguaranteed). Its input protection circuitry includes dedicated clamping diodes and layout hardening, validated per JEDEC JESD22-A114, making it suitable for manual handling and unshielded industrial environments.