STMicroelectronics 74VHCT273AMTR

Overview

74VHCT273AMTR from STMicroelectronics is an octal D-type positive-edge-triggered flip-flop with asynchronous active-low clear, fabricated in advanced CMOS technology. It operates at 4.5–5.5 V, delivers 170 MHz max clock frequency (typ.), 8 mA output drive, and features TTL-compatible inputs, power-down protection, and ±2 kV ESD immunity. It serves as a synchronous data latch in bus interface and control logic circuits.

For engineers reviewing the 74VHCT273AMTR datasheet, 74VHCT273AMTR pinout, 74VHCT273AMTR application, or 74VHCT273AMTR equivalent, key selection criteria include propagation delay matching (tPLH/tPHL ≈ 8.2 ns @ 15 pF), symmetrical output drive (|IOH| = IOL = 8 mA min), input voltage tolerance (0–7 V independent of VCC), and latch-up immunity for industrial control systems.

Technical Context

This device implements eight independent D-type latches triggered on the rising edge of CLOCK, with all outputs reset synchronously by a shared active-low CLEAR signal. Its sub-micron C2MOS process enables high-speed operation while maintaining low quiescent current (ICC = 4 µA max) and robust noise immunity (VOLP ≤ 0.9 V).

The input structure supports 0–7 V input voltage range regardless of VCC, enabling safe 5 V-to-3 V interfacing without level shifters. All pins feature integrated protection diodes and ESD structures, delivering 2 kV HBM immunity and tolerance to transient overvoltage during power sequencing.

Key Specifications

Pinout & Package

74VHCT273AMTR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with tape-and-reel packaging (MTR suffix). Dimensions conform to JEDEC MS-013, body width 7.5 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74VHCT273PW, the 74VHCT273AMTR offers identical electrical performance but in a larger SOIC package suited for manual assembly and thermal mass requirements; versus 74LCX273MTC, it provides essential 5 V tolerance and wider supply range critical for legacy interface bridging.

Availability

74VHCT273AMTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and legacy system bus interface applications requiring stable component supply and long-term lifecycle support.

Supply support for 74VHCT273AMTR 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, specializing in microcontrollers, power management, analog, and discrete devices for industrial, automotive, and consumer markets.

The 74VHCT series targets high-speed, low-power 5 V logic interfacing with enhanced robustness-designed specifically for industrial control, test equipment, and mixed-voltage system bridging where reliability and timing precision are critical.

FAQ

Is 74VHCT273AMTR compatible with standard 74LS273 logic levels?

Yes-its TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and 5 V supply range ensure direct replacement of 74LS273 in most applications. Output drive (8 mA) exceeds LS-series capability, improving fan-out margin. However, propagation delays differ: 74VHCT273AMTR is faster (8.2 ns vs. ~25 ns), requiring timing revalidation in critical paths.

Can 74VHCT273AMTR operate safely with VCC = 0 V while inputs are driven to 5 V?

Yes-the device includes power-down protection that allows inputs and outputs to tolerate −0.5 V to +7.0 V regardless of VCC state. This enables hot-plug operation and safe interfacing with powered subsystems during partial power-down sequences without risk of latch-up or damage.

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

74VHCT273AMTR is characterized up to 50 pF load capacitance in AC specifications (e.g., tPLH = 9.2 ns max at CL = 50 pF). Driving >50 pF may increase propagation delay and reduce noise margin; for heavier loads, use external buffer stages or verify timing with actual board parasitics and worst-case voltage/temperature conditions.

Does the CLEAR function override CLOCK during power-up sequencing?

Yes-CLEAR is asynchronous and active-low. When asserted (LOW), it forces all Q outputs LOW immediately, independent of CLOCK state or edge. During power-up, asserting CLEAR until VCC stabilizes ensures deterministic initial state, preventing metastability or spurious outputs before clock initialization.