STMicroelectronics M74HC4094YTTR

Overview

M74HC4094YTTR from STMicroelectronics is an automotive-grade 8-bit serial-in/parallel-out (SIPO) shift latch register with 3-state outputs, fabricated in silicon gate C2MOS technology. It operates from 2 V to 6 V, delivers 80 MHz max clock frequency at 6 V, supports cascading via QS/QS′ serial outputs, and features ±4 mA output drive capability - used for LED matrix control, GPIO expansion, and automotive body electronics.

For engineers reviewing the M74HC4094YTTR datasheet, M74HC4094YTTR pinout, M74HC4094YTTR application, or M74HC4094YTTR equivalent, this page provides verified functional identity, validated TSSOP16 pin mapping, confirmed automotive qualification (AEC-Q100), real-world timing behavior, and direct alternative part comparisons - all grounded in ST's production data sheet DocID1972 Rev 5.

Technical Context

The device integrates two synchronous stages: an 8-bit shift register clocked on the rising edge of CLOCK, and an 8-bit latch triggered by the falling edge of STROBE. Data propagates from SERIAL IN through Q1–Q8 (via QS cascade path), then latched into parallel outputs only when STROBE transitions low - enabling precise timing separation between shift and update phases.

Its 3-state output buffer is controlled independently by OE (active-high), allowing bus sharing without external logic. All inputs include ESD protection (HBM: 2 kV, CDM: 1 kV), and output impedance is symmetrical (|IOH| = IOL ≥ 4 mA), ensuring consistent rise/fall times and noise immunity (VNIH/VNIL ≥ 28% VCC).

Key Specifications

Pinout & Package

TSSOP16 package: 4.9 mm × 6.4 mm × 1.05 mm body, 0.65 mm pitch, lead-free and RoHS-compliant per ECOPACK® specifications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595PWR and 74LV4094PW,118, the M74HC4094YTTR uniquely combines AEC-Q100 qualification, dual serial outputs for robust daisy-chaining, and full 2–6 V operation - making it the only drop-in solution for automotive body electronics requiring guaranteed latch timing and ESD-hardened interfaces.

Availability

M74HC4094YTTR is available at Aetrix Electronics and suitable for automotive body control units, industrial HMI panels, and consumer appliance user interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC4094YTTR 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The M74HC4094YTTR belongs to ST's automotive-qualified HC logic family, engineered specifically for robustness in harsh electrical environments - emphasizing latch timing precision, ESD resilience, and extended temperature operation in body electronics and lighting control systems.

FAQ

What is the maximum clock frequency supported by M74HC4094YTTR at 5 V?

At VCC = 5 V, the M74HC4094YTTR supports a maximum clock frequency of 66 MHz (typical) and 24 MHz (guaranteed over −40 °C to +125 °C), per Table 7 in ST's DocID1972 Rev 5. This allows reliable high-speed serial loading in automotive infotainment and lighting control applications.

How does the STROBE signal interact with the shift register and latch stages?

The STROBE input controls only the latch stage: its falling edge transfers the current contents of the 8-bit shift register into the output latch. The shift register itself advances on every rising CLOCK edge, independent of STROBE - enabling asynchronous data loading and synchronous output updates.

Can M74HC4094YTTR be used in 3.3 V systems?

Yes - the device is fully specified from 2 V to 6 V, including 3.3 V operation. At VCC = 3.3 V, it guarantees fMAX ≥ 30 MHz, VOH ≥ 3.13 V (at IO = −4 mA), and VOL ≤ 0.33 V (at IO = 4 mA), meeting standard 3.3 V LVTTL interface requirements.

What is the purpose of the QS′ output, and how does it differ from QS?

QS reflects the output of the final shift register stage on the rising CLOCK edge; QS′ is a delayed copy of QS, updated on the subsequent falling CLOCK edge. This dual-output structure enables glitch-free cascading - QS′ of one device feeds SERIAL IN of the next, eliminating setup-time violations in multi-stage chains.