STMicroelectronics 74VHCT16245ATTR

Overview

74VHCT16245ATTR from STMicroelectronics is a 16-bit non-inverting bus transceiver with 3-state outputs, designed for bidirectional asynchronous data bus communication between two independent systems. It features 4.5 ns typical propagation delay at 5 V, ±8 mA symmetrical output drive, 4.5–5.5 V operating range, and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling direct interface with legacy TTL logic in industrial control backplanes.

For engineers reviewing the 74VHCT16245ATTR datasheet, 74VHCT16245ATTR pinout, 74VHCT16245ATTR application, or 74VHCT16245ATTR equivalent, key selection considerations include bidirectional bus isolation timing (tPZL/tPHZ ≤ 17.5 ns), high-impedance output leakage (±2.5 µA), ESD immunity (2 kV HBM), power-down input/output protection, and TSSOP-48 package compatibility with automated SMT assembly.

Technical Context

This transceiver implements dual 8-bit bidirectional data paths controlled by separate DIR and G inputs per port pair - 1DIR/1G governs A1–A8 ↔ B1–B8, while 2DIR/2G controls A9–A16 ↔ B9–B16. Directional control is synchronous with enable assertion, and all I/Os retain power-down protection regardless of supply state.

It uses sub-micron C2MOS technology to achieve balanced tPLH ≈ tPHL propagation delays and low dynamic noise (VOLP ≤ 0.9 V), with bus I/O pins supporting 0–5.5 V voltage tolerance and 8 pF typical input capacitance - critical for maintaining signal integrity in high-speed parallel bus interconnects.

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 and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16245A and 74ALVC16245, the 74VHCT16245ATTR uniquely supports 5 V TTL interoperability, 2 kV ESD robustness, and power-down safety - making it irreplaceable in industrial retrofits and mixed-voltage backplane systems.

Availability

74VHCT16245ATTR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridges, programmable logic I/O expansion, and test equipment data capture requiring stable component supply and long-term lifecycle assurance.

Supply support for 74VHCT16245ATTR 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, Switzerland, delivering automotive, industrial, and power management solutions with vertical manufacturing capabilities and broad IP portfolio.

The 74VHCT series targets industrial and telecom infrastructure applications requiring 5 V CMOS logic with TTL input compatibility, robust ESD performance, and extended temperature operation (–55 °C to +125 °C).

FAQ

Can 74VHCT16245ATTR operate reliably at –55 °C?

Yes. The device is fully specified from –55 °C to +125 °C per its Recommended Operating Conditions table. All AC/DC parameters - including propagation delay, output drive, and leakage current - are guaranteed across this full industrial temperature range, making it suitable for aerospace and outdoor infrastructure deployments.

What happens to I/O pins when VCC = 0 V?

When VCC is unpowered, all inputs and outputs enter a protected high-impedance state with diode clamping active. Input and output terminals tolerate –0.5 V to +7.0 V regardless of supply status, preventing damage or unintended current paths during power sequencing or hot-plug events.

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

Yes. Per STMicroelectronics' official product change notice (PCN 12-0127), the 74VHCT16245ATTR in TSSOP-48 packaging uses lead-free terminations and complies with EU RoHS Directive 2011/65/EU and REACH SVHC requirements, with full material declarations available upon request.

How does the 74VHCT16245ATTR handle simultaneous switching noise?

It mitigates simultaneous switching noise via low VOLP (≤0.9 V) and matched tPLH/tPHL delays (<1 ns skew), combined with eight dedicated GND pins distributed across the package to minimize ground loop inductance and suppress common-mode bounce during 16-bit parallel transitions.