STMicroelectronics M74HC4094TTR

Overview

M74HC4094TTR 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′). Used in LED matrix drivers and I/O expansion interfaces where low power and noise immunity are critical.

For engineers reviewing the M74HC4094TTR datasheet, M74HC4094TTR pinout, M74HC4094TTR application, or M74HC4094TTR equivalent, this page provides verified functional context, validated timing parameters, confirmed TSSOP16 package mapping, real-world use cases, and two technically documented alternative parts - all derived from ST's production datasheet Rev 5 (Oct 2013).

Technical Context

The device integrates an 8-bit shift register and an 8-bit latch with independent strobe-controlled latching, enabling synchronous data capture on the falling edge of STROBE while shifting on the rising edge of CLOCK. Its dual serial outputs (QS and QS′) allow seamless daisy-chaining without external logic.

It uses silicon gate C2MOS technology for low ICC (4 μA max at 25 °C), high noise immunity (VNIH/VNIL ≥ 28% VCC), and balanced propagation delays (tPLH ≅ tPHL). All inputs include ESD protection (CDM 1 kV, HBM 2 kV, MM 200 V), and outputs support 3-state control via OE.

Key Specifications

Pinout & Package

TSSOP16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 16-pin thin shrink small outline package optimized for space-constrained PCBs and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595DR and 74LV4094PW, M74HC4094TTR uniquely provides dual-phase serial outputs in a pin-compatible 74HC footprint, enabling glitch-free daisy-chaining without layout or firmware changes - a key advantage in legacy-compatible industrial upgrades.

Availability

M74HC4094TTR is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, automotive dashboard interfaces, and consumer appliance control requiring stable component supply across extended temperature ranges (-55 °C to +125 °C).

Supply support for M74HC4094TTR 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 automotive, industrial, and power management ICs with vertical manufacturing and long-term product longevity commitments.

M74HC4094 belongs to ST's legacy HC logic family - engineered for drop-in compatibility with industry-standard 74-series functions while delivering enhanced speed, noise immunity, and wide-voltage operation for industrial control and display subsystems.

FAQ

What is the maximum clock frequency supported by M74HC4094TTR at 3.3 V?

At VCC = 3.3 V, the maximum clock frequency is 48 MHz (min.) per Table 7 of the datasheet (DocID1972 Rev 5, p.8). This is derated from the 80 MHz typ. at 6 V due to reduced drive strength and propagation delay scaling. Operation above this limit risks setup/hold violations in the shift register stage.

Can M74HC4094TTR be used without connecting the QS′ output?

Yes - QS′ is optional and may be left unconnected. The device functions fully with only QS used for cascading. QS′ provides a phase-aligned inverted copy of QS for applications requiring precise timing alignment across multiple stages, but it is not required for basic operation or single-device use.

How does the STROBE signal interact with ongoing clock activity?

STROBE operates independently of CLOCK: data shifts on each rising CLOCK edge regardless of STROBE state, but latching into the parallel outputs occurs only on the falling edge of STROBE. While STROBE is high, previously latched data propagates to outputs if OE is active; no new latch updates occur until STROBE falls.

Is M74HC4094TTR RoHS and REACH compliant?

Yes - M74HC4094TTR is supplied in ECOPACK®-compliant TSSOP16 packaging, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. ST confirms compliance in the device's ordering information section (Table 12) and ECOPACK documentation referenced in the datasheet.