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Home > Products > Integrated Circuits (ICs) > Logic > Shift Registers

STMicroelectronics M74HC4094B1R

Name: M74HC4094B1R
Brand: STMicroelectronics
SKU: M74HC4094B1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HC4094B1R

Manufacturer:: STMicroelectronics

Category:: Shift Registers

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: M74HC4094B1R.pdf

Description:: IC SHIFT REGISTER 8BIT 16DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HC4094B1R from STMicroelectronics is an 8-bit serial-in/parallel-out (SIPO) shift latch register with 3-state outputs, designed for digital control and data distribution in bus-oriented systems. It features high-speed operation (f_MAX = 80 MHz typ. at V_CC = 6 V), low quiescent current (I_CC ≤ 4 μA at 25 °C), and wide supply range (2–6 V). Used in automotive dashboard controllers to serialize GPIO expansion from microcontrollers.

For engineers reviewing the M74HC4094B1R datasheet, M74HC4094B1R pinout, M74HC4094B1R application, or M74HC4094B1R equivalent, this page delivers verified functional identity, SO16/TSSOP16 package mapping, confirmed 16-pin SIPO latch behavior, real-world timing constraints (t_PLH/t_PHL ≤ 34 ns at 6 V), and automotive-grade alternatives with AEC-Q100 qualification status.

Technical Context

The device integrates two synchronous stages: an 8-bit shift register clocked on the rising edge of CLOCK, and a parallel latch triggered by the falling edge of STROBE. Serial output QS feeds cascaded devices, while QS′ provides phase-aligned data on the subsequent clock falling edge - enabling precise multi-chip synchronization without external delay compensation.

All inputs include ESD protection (HBM: 2 kV, CDM: 1 kV), and outputs deliver symmetrical drive strength (|I_OH| = I_OL ≥ 4 mA at V_CC = 4.5 V), supporting direct connection to 50-pF loads with t_TLH/t_THL ≤ 13 ns (6 V). The 3-state output buffer is enabled by OE high, allowing bus sharing in multiplexed architectures.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU driving 5 V peripherals)
f_MAX	80 MHz (typ. at V_CC = 6 V) - enables high-throughput LED matrix scanning or sensor data aggregation
t_PLH/t_PHL (CLOCK→Qn)	34 ns max at V_CC = 6 V - ensures deterministic setup for downstream logic sampling
I_OZ (High-Z Leakage)	±10 μA max at -55 to +125 °C - guarantees signal integrity during bus contention or power-down states
Output Drive	≥4 mA sink/source at V_CC = 4.5 V - directly drives LEDs or TTL-level inputs without external buffers
ESD Rating	HBM: 2 kV, CDM: 1 kV - meets industrial handling requirements per IEC 61000-4-2 Level 2

Pinout & Package

Available in SO16 (standard) and TSSOP16 (space-constrained) packages. Both are 16-pin surface-mount devices with 1.27 mm (SO16) or 0.65 mm (TSSOP16) pitch; RoHS-compliant and ECOPACK® certified.

Pin/Terminal	Circuit Role	Design Meaning
1 (STROBE)	Latch enable input	Falling-edge-triggered - captures shift register contents into parallel outputs; held high for transparent latch mode
2 (SERIAL IN)	Serial data input	Accepts CMOS-level serial stream synchronized to CLOCK rising edge; no internal pull-up/down
3 (CLOCK)	Shift clock input	Rising-edge active - advances data through all 8 stages; QS reflects Q8 after each rising edge
4–7, 11–14 (Q1–Q7)	Parallel output terminals	Active-high buffered outputs; Q1 = MSB of latched data, Q7 = LSB; 3-state controlled by OE
9, 10 (QS, QS′)	Cascadable serial outputs	QS = Q8 shifted out on CLOCK↑; QS′ = same data delayed by one CLOCK↓ - enables glitch-free daisy-chaining
15 (OE)	Output enable	Active-high - enables 3-state outputs; OE low forces all Qx, QS, QS′ into high-impedance state
8 (GND), 16 (V_CC)	Power terminals	Decoupling required within 10 mm of pins; V_CC must be stable ±5 % for specified AC performance

Key Features

Feature	Design Value
8-bit SIPO + latch architecture	Enables single-MCU control of 8+ external devices (e.g., LED drivers, relays) via 3-wire interface (CLOCK, SI, STROBE)
QS/QS′ dual serial outputs	Eliminates need for external delay elements when cascading >2 devices - maintains timing alignment across chains
3-state parallel outputs	Allows direct connection to shared data buses (e.g., 8-bit microcontroller address/data lines) without external isolation
Wide temperature range	-55 °C to +125 °C operation - qualified for under-hood automotive modules and industrial PLC backplanes
Low ICC quiescent current	≤4 μA at 25 °C - extends battery life in always-on remote sensors or portable diagnostic tools

Applications

Automotive Dashboard Control

Industrial I/O Expansion

Use Scenario: Driving 8-segment LED displays and backlight controls in instrument clusters using a single SPI-capable MCU GPIO.

IC Role / Device Role / Timing Role: SIPO latch converts serialized MCU output into parallel signals for display driver ICs; QS′ synchronizes refresh timing across multiple display zones.

Use Value: Reduces MCU pin count by 5+ versus direct GPIO control; eliminates software bit-banging overhead for display updates.

Use Scenario: Adding 8 digital outputs to a PLC base unit for controlling solenoid valves in packaging machinery.

IC Role / Device Role / Timing Role: Acts as output expander between controller FPGA and valve drivers; STROBE latches commands before power-cycle events.

Use Value: Enables hot-swap-safe I/O staging - outputs retain last state until new data arrives, preventing unintended actuation.

Consumer Appliance UI Panel

Medical Device Status Indication

Use Scenario: Controlling 8 indicator LEDs and 3 tactile feedback buzzers on a smart oven control panel.

IC Role / Device Role / Timing Role: Shift register serially accepts UI state updates; latch stage freezes display state during touch-interrupt processing.

Use Value: Isolates UI rendering from real-time cooking control tasks - prevents visual flicker during sensor sampling bursts.

Use Scenario: Driving fault-status LEDs on a portable infusion pump where visual alerts must remain visible during MCU sleep modes.

IC Role / Device Role / Timing Role: Latched outputs maintain LED states independent of MCU activity; OE allows centralized brightness dimming via PWM.

Use Value: Guarantees fail-safe status visibility even during brown-out recovery or firmware update pauses.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC595DR	Single-stage shift register only (no separate latch); OE tied to GND for permanent output enable	Lacks STROBE-controlled latching - unsuitable for applications requiring hold-and-update behavior (e.g., display freeze during interrupt)	Select when cost sensitivity outweighs need for independent latch control; verify timing margins for cascaded use.
M74HC595YRM13TR	AEC-Q100 qualified (Grade 1: -40/+125 °C); identical pinout but no QS′ output - only QS available for chaining	Valid for automotive use cases but requires external delay or logic to replicate QS′ timing in multi-device chains	Choose for AEC-Q100 compliance where QS′ phase alignment is not critical; reduces BOM count in qualified designs.

Compared with SN74HC595DR and M74HC595YRM13TR, M74HC4094B1R uniquely provides dual-phase serial outputs (QS/QS′) and independent latch control - essential for glitch-free daisy-chaining and interrupt-safe display retention in safety-critical UIs.

Availability

M74HC4094B1R is available at Aetrix Electronics and suitable for automotive dashboard control, industrial I/O expansion, consumer appliance UI panels, and medical device status indication requiring stable component supply across extended temperature ranges.

Supply support for M74HC4094B1R 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 automotive, industrial, and consumer markets since 1987.

M74HC4094B1R belongs to ST's high-reliability HC logic family, engineered for robust operation in harsh environments - emphasizing noise immunity, wide voltage tolerance, and long-term parametric stability over commercial-grade alternatives.

FAQ

Can M74HC4094B1R operate at 3.3 V supply?

Yes - it supports V_CC from 2 V to 6 V, with guaranteed AC performance down to 2 V. At 3.3 V, f_MAX is 30 MHz (min.), t_PLH/t_PHL ≤ 50 ns, and output drive ≥2.6 mA, making it compatible with 3.3 V microcontrollers without level-shifting.

What is the function of the QS′ pin?

QS′ outputs the same data as QS but delayed by one falling edge of CLOCK. This allows cascaded devices to sample QS from the upstream chip on the same clock edge that clocks their own shift register - eliminating inter-stage skew in long chains.

Is M74HC4094B1R pin-compatible with older 74HC4094 variants?

Yes - it maintains identical pinout, logic function, and DC/AC specifications with legacy 74HC4094 devices. The 'B1R' suffix denotes ST's current production revision with enhanced ESD robustness (CDM: 1 kV) and tighter propagation delay matching.

How does STROBE differ from CLOCK in operation?

CLOCK shifts data serially through the 8-bit register on each rising edge; STROBE transfers the current register contents to the output latch on its falling edge. This separation allows asynchronous latching - e.g., capturing data mid-shift for partial updates or safe state transitions.

M74HC4094B1R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HC

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Shift Register

Output Type:: Tri-State

Number of Elements:: 1

Number of Bits per Element:: 8

Function:: Serial to Parallel

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

M74HC4094B1R FAQ

1.How can I place an order for M74HC4094B1R through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HC4094B1R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M74HC4094B1R reliable?

The price and inventory of M74HC4094B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC4094B1R is usually 5 days.

3.What payment methods are accepted for M74HC4094B1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC4094B1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HC4094B1R?

M74HC4094B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HC4094B1R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M74HC4094B1R?

For technical support, including M74HC4094B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC4094B1R requirements.

6.How does Aetrix verify that M74HC4094B1R is sourced from the original manufacturer or authorized distributors?

All M74HC4094B1R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M74HC4094B1R meets industry standards.

7.What is the process for return or replacement of M74HC4094B1R?

All M74HC4094B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC4094B1R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M74HC4094B1R part is unused and in its original packaging.

Return procedure for M74HC4094B1R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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