STMicroelectronics M74HCT273RM13TR

Overview

M74HCT273RM13TR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with asynchronous master clear, fabricated in silicon gate C2MOS technology. It features 8 edge-triggered D inputs synchronized to the positive-going clock edge, active-low synchronous reset (CLEAR), 8 buffered Q outputs, and operates at VCC = 4.5–5.5 V with fMAX = 80 MHz (typ.) at 4.5 V. Used in digital control logic, address latching, and data synchronization in industrial microcontroller interfaces.

For engineers reviewing the M74HCT273RM13TR datasheet, M74HCT273RM13TR pinout, M74HCT273RM13TR application, or M74HCT273RM13TR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), low quiescent current (ICC ≤ 4 µA), and TSSOP-20 package suitability for space-constrained PCB layouts.

Technical Context

The device implements eight independent D-type latches with shared clock and active-low CLEAR, all triggered on the rising edge of CLOCK. Its C2MOS process ensures rail-to-rail output swing and symmetrical drive capability (|IOH| = IOL = 4 mA min) across temperature ranges from –55°C to +125°C.

Input protection circuits guard against ESD and transient overvoltage; logic levels are TTL-compatible, enabling direct interfacing with legacy 74-series devices without level-shifting. Propagation delays are balanced (tPLH/tPHL ≈ 30/30 ns typ. at VCC = 4.5 V), minimizing skew in parallel data paths.

Key Specifications

Pinout & Package

TSSOP-20 package: 20-pin thin shrink small outline package, 6.5 mm × 4.4 mm body, 0.65 mm pitch, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT273PWR and 74VHC273FT, M74HCT273RM13TR provides superior low-power performance (4 µA ICC), full industrial temperature support, and proven robustness in long-lifecycle embedded systems - making it optimal for cost-sensitive, thermally demanding, or safety-validated deployments.

Availability

M74HCT273RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for M74HCT273RM13TR 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, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

M74HCT273RM13TR belongs to the HCT logic family - engineered for TTL-compatible interfacing, low power consumption, and robust operation in harsh environments, targeting digital control, data acquisition, and system-level synchronization.

FAQ

Is M74HCT273RM13TR pin-compatible with standard 74HCT273 devices?

Yes. M74HCT273RM13TR uses the TSSOP-20 package with identical pin numbering and function mapping to the industry-standard 74HCT273, including shared CLOCK, CLEAR, D0–D7, and Q0–Q7 assignments. Mechanical dimensions and solder pad layout match JEDEC MO-153, enabling direct PCB footprint reuse.

What is the minimum pulse width required on the CLEAR input?

The minimum CLEAR pulse width is 7 ns (typ.) at VCC = 4.5 V and TA = 25°C, with a maximum of 22 ns across –55°C to +125°C. This ensures reliable asynchronous reset even in high-speed clock domains where CLEAR may be asserted briefly between clock edges.

Does M74HCT273RM13TR support hot insertion or live insertion?

No. The device lacks hot-swap protection circuitry. Applying VCC while signals are present may cause latch-up or excessive current due to input diode conduction. Power sequencing must follow GND → VCC → inputs, and removal must reverse this order to avoid damage.

Can M74HCT273RM13TR drive standard 74LS TTL loads directly?

Yes. With IOL/IOH ≥ 4 mA (min.) and VOL ≤ 0.40 V at 4 mA sink, it meets 74LS input requirements (IIH ≤ 20 µA, IIL ≤ 0.4 mA). Each output can drive up to 10 LS-TTL inputs, verified across –55°C to +125°C with no external pull-ups needed.