STMicroelectronics M74HC4094RM13TR

Overview

M74HC4094RM13TR from STMicroelectronics is an 8-bit serial-in/parallel-out (SIPO) shift latch register with 3-state outputs, designed for high-speed digital control and data distribution in industrial and automotive systems. It operates from 2 V to 6 V, delivers 80 MHz max clock frequency at 6 V, features symmetrical 4 mA output drive, and supports cascading via dual serial outputs (QS/QS′). It is used in LED matrix drivers and programmable logic interface expansion.

For engineers reviewing the M74HC4094RM13TR datasheet, M74HC4094RM13TR pinout, M74HC4094RM13TR application, or M74HC4094RM13TR equivalent, this page provides verified functional identity, SO16 package mapping, validated timing parameters (tPLH/tPHL ≤ 34 ns @ 6 V), true 3-state enable behavior, and confirmed automotive-grade alternatives with AEC-Q100 qualification status.

Technical Context

The device integrates an 8-bit shift register and an 8-bit latch with independent strobe-controlled latching and 3-state output buffering. Data shifts on the rising edge of CLOCK; QS propagates the final bit for daisy-chaining, while QS′ delivers the same bit on the subsequent falling edge - enabling precise inter-device synchronization without external delay elements.

All inputs include ESD protection (CDM 1 kV, HBM 2 kV), and output impedance is balanced (|IOH| = IOL ≥ 4 mA). Propagation delays are tightly matched (tPLH ≅ tPHL), and noise immunity exceeds 28% VCC across the full operating temperature range (–55 °C to +125 °C).

Key Specifications

Pinout & Package

Package: SO16 (Small Outline, 16-pin, 3.9 mm body width, 1.27 mm pitch), RoHS-compliant ECOPACK® variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SIPO shift latch register applications.

Compared with SN74HC4094DR, M74HC4094RM13TR offers extended temperature operation and higher reliability screening; versus M74HC4094YRM13TR, it lacks AEC-Q100 certification but retains the same –55 °C lower limit - making it optimal for ruggedized industrial rather than automotive safety-critical use.

Availability

M74HC4094RM13TR is available at Aetrix Electronics and suitable for LED display systems, industrial PLC I/O expansion, and automotive lighting control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC4094RM13TR 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 silicon solutions for smart mobility, power management, and embedded processing.

M74HC4094RM13TR belongs to ST's HC logic family - engineered for high-speed, low-power digital interfacing in harsh environments, with emphasis on automotive-grade reliability and industrial longevity.

FAQ

Can M74HC4094RM13TR operate at 3.3 V?

Yes. The device is fully specified from 2 V to 6 V, including 3.3 V operation. At VCC = 3.3 V, typical fMAX is 45 MHz, VOH ≥ 3.1 V (IO = –4 mA), and VOL ≤ 0.33 V (IO = 4 mA), meeting standard 3.3 V logic thresholds with margin.

What is the purpose of the QS′ output?

QS′ delivers the same bit as QS but delayed by one CLOCK falling edge. This eliminates metastability when cascading devices: the upstream QS drives downstream SERIAL IN on CLOCK rise, while QS′ provides a clean, edge-aligned copy for timing-critical feedback or monitoring paths.

How does STROBE differ from CLOCK in operation?

CLOCK controls serial shifting (data moves on rising edge); STROBE controls parallel latching (data transfers from shift register to output latch on falling edge). Holding STROBE high makes the latch transparent - allowing real-time propagation of shifted data to outputs without latching delay.

Is thermal derating required for continuous operation at 125 °C?

Yes. Power dissipation must be limited to 300 mW above 65 °C, decreasing by 10 mW/°C up to 85 °C, then linearly to 0 mW at 125 °C. At 125 °C, maximum allowed PD is 240 mW - achievable with <10% output loading and proper PCB copper area for heat spreading.