STMicroelectronics 74ACT16245TTR

Overview

74ACT16245TTR from STMicroelectronics is a 16-bit non-inverting bus transceiver with 3-state outputs, designed for bidirectional asynchronous data bus interfacing between subsystems. It operates at 4.5–5.5 V, delivers 4.9 ns typical propagation delay, supports ±24 mA symmetrical drive, and provides 2 kV ESD protection-used in industrial backplane interconnects and memory expansion modules.

For engineers reviewing the 74ACT16245TTR datasheet, 74ACT16245TTR pinout, 74ACT16245TTR application, or 74ACT16245TTR equivalent, key selection criteria include direction-controlled bidirectional flow, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), 50 Ω transmission line driving capability, and TSSOP-48 package thermal and routing constraints.

Technical Context

This device implements dual 8-bit bidirectional data paths controlled independently by DIR and G inputs: 1DIR/1G govern A↔B transfer on pins 1A1–1A8 ↔ 1B1–1B8, while 2DIR/2G control the second path (2A1–2A8 ↔ 2B1–2B8). Each channel supports high-impedance isolation when G is high.

It uses sub-micron C2MOS technology to achieve low ICC (8 µA max at 25°C) and latch-up immunity, with symmetrical output drive (|IOH| = IOL = 24 mA min) enabling clean signal integrity on terminated 50 Ω lines without external biasing.

Key Specifications

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height - optimized for high-density PCB layouts with thermal relief via exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver applications.

Compared with SN74ACT16245DGGR and 74LVC16245APAG, the 74ACT16245TTR uniquely supports direct 5 V operation with TTL compatibility and TSSOP-48 manufacturability-making it optimal for industrial retrofits and mixed-signal backplanes requiring robust 5 V signaling.

Availability

74ACT16245TTR is available at Aetrix Electronics and suitable for industrial backplane interconnects, memory expansion modules, FPGA configuration interfaces, and legacy ISA bus adapters requiring stable component supply across extended temperature ranges.

Supply support for 74ACT16245TTR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The 74ACT high-speed CMOS logic family targets industrial and telecom infrastructure where 5 V robustness, low power, and ESD resilience are critical-designed specifically for bus isolation, level translation, and high-reliability backplane signaling.

FAQ

What is the maximum operating temperature range for the 74ACT16245TTR?

The 74ACT16245TTR is rated for operation from –55°C to +125°C, validated per STMicroelectronics' recommended operating conditions. This extended range supports deployment in harsh industrial enclosures, outdoor telecom cabinets, and engine-control proximity applications where ambient temperatures exceed commercial-grade limits.

Can the 74ACT16245TTR be used with 3.3 V logic inputs?

No-its VIH minimum is 2.0 V at VCC = 4.5 V, but inputs are not 5 V-tolerant when VCC = 3.3 V. The device requires VCC = 4.5–5.5 V to guarantee correct switching; applying 3.3 V logic signals directly risks undefined behavior or damage due to internal clamping diode conduction.

How does the 3-state disable timing affect system bus arbitration?

tPLZ = 5.6 ns (typ.) and tPHZ = 7.3 ns (typ.) define the maximum time from G going high to full output disconnection. These values ensure minimal bus turnaround latency in multi-master systems-critical for meeting tight arbitration windows in real-time industrial networks like Profibus or CANopen gateways.

Is the TSSOP-48 package lead-free and RoHS-compliant?

Yes-the 74ACT16245TTR in TSSOP-48 packaging meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations (matte tin plating). STMicroelectronics confirms full compliance in its official product change notices (PCN 12-0027), including exemption 7a for high-melting-temperature solder alloys.