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

STMicroelectronics M74HC595B1R

Name: M74HC595B1R
Brand: STMicroelectronics
SKU: M74HC595B1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HC595B1R

Manufacturer:: STMicroelectronics

Category:: Shift Registers

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

Datasheet:: M74HC595B1R.pdf

Description:: IC SHIFT REGISTER 8BIT 16-DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HC595B1R from STMicroelectronics is a high-speed CMOS 8-bit serial-in, parallel-out shift register with output latches and 3-state outputs. It features separate clocks for shifting (SCK) and latching (RCK), asynchronous shift-register clear (SCLR), and cascading capability via QH' serial output. Operates from 2V to 6V with f_MAX = 59 MHz (typ. at V_CC = 6V), I_CC ≤ 4 µA (max. at 25°C), and symmetrical 6 mA output drive (QA–QH). Used in LED matrix drivers, GPIO expanders, and digital control interfaces.

For engineers reviewing the M74HC595B1R datasheet, M74HC595B1R pinout, M74HC595B1R application, or M74HC595B1R equivalent, key selection factors include its dual-clock architecture, 3-state output enable (G), QH' cascade support, and guaranteed 2V–6V operation across industrial temperature range (−55°C to +125°C).

Technical Context

The M74HC595B1R integrates two synchronous registers: an 8-bit shift register accepting serial data (SI) on SCK rising edges, and an independent 8-bit storage register loaded on RCK rising edges. Its SCLR input asynchronously resets only the shift register, preserving latch state until next RCK pulse.

Outputs QA–QH are 3-state controlled by G (active-low), while QH' provides non-inverted serial output for daisy-chaining. Input protection includes ESD and transient voltage clamping; propagation delays are balanced (t_PLH ≅ t_PHL) and specified down to 2V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2 V to 6 V - supports battery-powered and mixed-voltage logic systems without level shifters.
f_MAX	59 MHz (typ. at V_CC = 6 V) - enables high-throughput serial-to-parallel conversion in real-time control loops.
I_O (QA–QH)	±6 mA (min.) - drives standard LEDs directly or interfaces with 74-series inputs without buffers.
t_PLH/t_PHL (RCK→Qn)	13 ns (typ. at V_CC = 6 V, CL = 50 pF) - ensures deterministic timing for synchronized output updates.
Output Enable Delay	t_PZL/t_PZH = 13 ns (typ. at V_CC = 6 V) - allows rapid multiplexing of multiple shift-register banks.
Input Noise Immunity	V_NIH/V_NIL = 28% V_CC (min.) - rejects >1.2 V noise on 4.5 V systems, improving robustness in noisy industrial environments.
I_CC (Quiescent)	4 µA (max. at T_A = 25°C) - enables ultra-low-power standby in always-on embedded controllers.

Pinout & Package

Package: Plastic DIP-16 (0.300″ wide), 16-pin through-hole, JEDEC MS-001AC compliant. Body dimensions: 20.0 × 8.5 × 3.3 mm (L × W × H).

Pin/Terminal	Circuit Role	Design Meaning
1–7, 15 (QA–QH)	Parallel Output (3-state)	Active-high latched data outputs; tri-stated when G = HIGH - enables bus sharing and dynamic load isolation.
9 (QH')	Serial Output	Non-inverted output of QH stage; used to cascade multiple M74HC595B1R devices without external inversion.
10 (SCLR)	Shift Register Clear	Asynchronous active-low reset of shift register only - preserves latch contents during re-initialization sequences.
11 (SCK)	Shift Clock	Rising-edge triggered; advances SI bit into first stage and shifts existing bits - defines serial data rate.
12 (RCK)	Storage Register Clock	Rising-edge triggered; transfers all 8 bits from shift register to output latches - controls update timing of QA–QH.
13 (G)	Output Enable	Active-low 3-state control; disables all QA–QH outputs simultaneously - essential for multiplexed display drivers.
14 (SI)	Serial Input	Data entry point for shift register; sampled on SCK rising edge - forms basis for SPI-compatible interface.
8 (GND)	Ground Reference	0 V return path for all internal logic and output drivers - must be low-impedance for stable noise immunity.
16 (V_CC)	Positive Supply	Primary power rail (2–6 V); powers both logic core and output drivers - decoupling capacitor required near pin.

Key Features

Feature	Design Value
Dual independent clocks (SCK & RCK)	Enables asynchronous serial loading and synchronous output updating - eliminates race conditions in multi-device chains.
QH' serial output	Provides direct cascade path without external inverters - reduces component count and PCB area in LED driver stacks.
Asynchronous SCLR	Resets shift register without disturbing stored latch data - supports partial reconfiguration while maintaining display state.
3-state outputs with common G	Allows time-multiplexed sharing of single data bus among multiple shift-register banks - critical for large-scale LED signage.
Guaranteed operation at −55°C to +125°C	Validated for extended industrial and automotive under-hood applications - no derating required across full temperature range.

Applications

LED Matrix Driver

GPIO Expander

Use Scenario: Driving 8×8 monochrome LED displays using multiplexed row/column scanning.

IC Role / Device Role / Timing Role: Serial-to-parallel converter providing column data latches; synchronized by RCK to match row-select timing.

Use Value: Eliminates need for microcontroller parallel port; QH' enables daisy-chained expansion to 16+ columns with single SPI line.

Use Scenario: Adding 8 programmable digital outputs to an MCU with limited GPIO (e.g., STM32F030F4).

IC Role / Device Role / Timing Role: Shift-register-based output expander; SCK and RCK decoupled to allow background serial loading and atomic output update.

Use Value: Enables glitch-free output changes; 3-state G pin permits safe hot-swap of peripheral modules without bus contention.

Industrial Control Panel

Automotive Interior Lighting

Use Scenario: Controlling 8 relay drivers or status indicators on factory HMIs with noise-prone wiring.

IC Role / Device Role / Timing Role: Isolated output interface with high noise immunity (28% V_CC) and robust ESD protection.

Use Value: Prevents false triggering from EMI; 6 mA drive strength directly activates optocouplers or small relays without buffer transistors.

Use Scenario: Dimmable ambient lighting control in vehicle cabins using PWM-modulated LED strings.

IC Role / Device Role / Timing Role: Latched output stage feeding constant-current LED drivers; updated via CAN-to-SPI bridge firmware.

Use Value: −55°C to +125°C rating ensures reliability in parked-car thermal extremes; low I_CC minimizes parasitic drain on 12 V battery.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC595N	Same logic function and pinout; higher max I_CC (8 µA vs. 4 µA) and wider V_CC tolerance (2–6.5 V).	Preferred where 6.5 V operation or TI ecosystem compatibility is required; less suitable for ultra-low-power battery systems.	Select SN74HC595N if sourcing from TI-authorized channels or requiring margin above 6 V.
74AHC595PW	Higher speed (f_MAX = 115 MHz at 5 V); lower propagation delay (t_PLH = 4.5 ns); 3.3 V optimized but 2–5.5 V rated.	Better for high-frequency SPI interfaces (>20 MHz) or 3.3 V-only systems; not rated for 6 V or −55°C operation.	Choose 74AHC595PW when speed >50 MHz or 3.3 V supply dominates; avoid for 6 V or extended temperature use.

Compared with SN74HC595N and 74AHC595PW, the M74HC595B1R offers superior low-power performance (4 µA I_CC) and extended temperature support (−55°C), making it optimal for battery-constrained industrial and automotive applications where 6 V operation and thermal resilience are mandatory.

Availability

M74HC595B1R is available at Aetrix Electronics and suitable for LED matrix drivers, GPIO expansion modules, industrial control panels, and automotive interior lighting systems requiring stable component supply across long production lifecycles.

Supply support for M74HC595B1R 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 broad IP portfolio.

The M74HC595B1R belongs to ST's legacy HC logic family, designed for pin- and function-compatible replacement of 74LS595 in low-power, wide-voltage industrial control and display subsystems.

FAQ

What is the maximum clock frequency supported by M74HC595B1R at 3.3 V?

At V_CC = 3.3 V and C_L = 50 pF, the M74HC595B1R supports f_MAX = 30 MHz (typ.) and 24 MHz (max. over −40°C to +85°C). This is confirmed in AC Electrical Characteristics Table (page 6), where f_MAX = 30/24 MHz is specified for V_CC = 4.5 V, and interpolation to 3.3 V aligns with the 2.0 V (4.8 MHz) and 4.5 V (30 MHz) boundary points.

Can M74HC595B1R drive standard red LEDs directly without current-limiting resistors?

No - while QA–QH deliver ±6 mA (min.), red LEDs typically require 10–20 mA for visibility and have forward voltages (~1.8 V) that cause excessive current at 5 V without series resistance. The datasheet specifies output voltage drop (e.g., VOL = 0.26 V at 6 mA, 4.5 V), confirming internal resistance limits current but does not eliminate need for external resistors per LED.

How does the SCLR pin interact with the storage register during operation?

SCLR asynchronously clears only the 8-bit shift register; it has no effect on the storage register or QA–QH outputs. Data latched in the storage register remains unchanged until RCK asserts, allowing safe re-initialization of serial input stream without disrupting displayed or controlled outputs.

Is M74HC595B1R compatible with 3.3 V microcontrollers like ESP32 or Raspberry Pi Pico?

Yes - its V_CC range (2–6 V) and input thresholds (VIH = 3.15 V min. at V_CC = 4.5 V) ensure reliable interfacing with 3.3 V logic. At V_CC = 3.3 V, VIH ≈ 2.3 V (28% × 3.3 V), exceeding typical 3.3 V MCU VOH (≥2.4 V), satisfying DC noise margin requirements per datasheet Section 5.

M74HC595B1R 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, Serial

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

M74HC595B1R FAQ

1.How can I place an order for M74HC595B1R through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HC595B1R 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 M74HC595B1R reliable?

The price and inventory of M74HC595B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC595B1R is usually 5 days.

3.What payment methods are accepted for M74HC595B1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC595B1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HC595B1R?

M74HC595B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HC595B1R 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 M74HC595B1R?

For technical support, including M74HC595B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC595B1R requirements.

6.How does Aetrix verify that M74HC595B1R is sourced from the original manufacturer or authorized distributors?

All M74HC595B1R 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 M74HC595B1R meets industry standards.

7.What is the process for return or replacement of M74HC595B1R?

All M74HC595B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC595B1R, 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 M74HC595B1R part is unused and in its original packaging.

Return procedure for M74HC595B1R:

1.Submit a request within 90 days.

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

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