STMicroelectronics 74ACT08TTR

Overview

74ACT08TTR from STMicroelectronics is a quad 2-input AND gate IC in TSSOP-14 package, operating at 4.5–5.5 V with 4.5 ns typical propagation delay, 24 mA output drive, and TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). It interfaces high-speed CMOS systems with TTL/NMOS logic in industrial control timing and digital signal routing.

For engineers reviewing the 74ACT08TTR datasheet, 74ACT08TTR pinout, 74ACT08TTR application, or 74ACT08TTR equivalent, key selection criteria include transmission-line driving capability (50 Ω), symmetrical output impedance, latch-up immunity, and guaranteed operation across –55°C to +125°C.

Technical Context

The device implements four independent AND gates using sub-micron C2MOS technology with buffered outputs, enabling high noise immunity and stable switching. Each gate features matched tPLH/tPHL delays and supports incident-wave switching on 50 Ω transmission lines.

Input protection includes 2 kV ESD immunity per IEC 61000-4-2; all inputs/outputs tolerate –0.5 V to VCC + 0.5 V. The logic family is pin- and function-compatible with standard 74-series 08 devices while delivering CMOS power efficiency and TTL voltage-level interoperability.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9–5.1 mm width, 6.25–6.5 mm length, 0.65 mm pitch, 0.5–0.7 mm lead length, thin-profile surface-mount construction with moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT08DR and 74VHC08FT, the 74ACT08TTR uniquely combines TSSOP space savings, 24 mA drive, and guaranteed 50 Ω transmission-line performance-making it optimal for high-density, high-speed industrial PCBs requiring minimal signal integrity compromise.

Availability

74ACT08TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and digital test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ACT08TTR 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 74ACT logic family targets high-speed, low-power interface bridging between legacy TTL and modern CMOS systems-emphasizing robustness, compatibility, and signal integrity in harsh environments.

FAQ

Is 74ACT08TTR compatible with 3.3 V logic inputs?

No. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are specified only for 4.5–5.5 V VCC operation. Applying 3.3 V signals risks marginal VIH margin and undefined switching behavior; use 74LVC08 or level translators for mixed-voltage interfacing.

What is the maximum recommended output load capacitance?

The AC specifications are characterized at CL = 50 pF. Driving >75 pF increases propagation delay nonlinearly and may cause ringing; for >100 pF loads, add series damping resistors or use buffer stages to maintain timing margins.

Does 74ACT08TTR require external pull-up or pull-down resistors on unused inputs?

Yes. Unused inputs must be tied to VCC or GND via ≤1 kΩ resistors. Floating inputs risk increased ICC, oscillation, and ESD susceptibility due to CMOS input structure-never leave them open.

Can 74ACT08TTR drive LED indicators directly?

No. While its 24 mA output exceeds typical LED forward current (10–20 mA), sustained DC drive violates the "one output loaded at a time" condition in AC specs and risks thermal overstress. Use dedicated LED drivers or current-limiting resistors ≥220 Ω with derated duty cycle.