CD74HC595E Texas Instruments In Stock
CD74HC595E is an 8-bit serial-in parallel-out (SIPO) shift register with output latches by Texas Instruments. Key specs: 2 V to 6 V supply, 25 MHz shift clock, 8 tri-state outputs, 16-pin PDIP package. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Price
- From $0.5716(MOQ 100)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HC595E?
- 8-bit SIPO shift register with separate storage register enabling glitch-free parallel output update via RCLK latch pulse
- Tri-state output capability on all 8 output pins allows multiple CD74HC595E devices to share a common output bus without contention
- Serial daisy-chain output (QH') enables cascading multiple 8-bit stages to 16, 24, or 32 outputs using only 3 microcontroller SPI pins
What is CD74HC595E used for?
The CD74HC595E is widely used for GPIO expansion in embedded systems, driving LED arrays, 7-segment displays, and relay banks from a 3-wire SPI interface with minimal microcontroller pin usage. Its cascadable architecture allows designers to drive 64 or more output lines by chaining 8 ICs while consuming only 3 GPIO pins (data, clock, latch) on the host MCU. It also appears in industrial PLC output modules, keypad decoders, and robotics control boards where compact 16-pin DIP through-hole assembly and 6 V tolerance are required.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
What are equivalent replacements for CD74HC595E?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the separate storage latch in CD74HC595E prevent glitching on the 8 output pins during data shifting?
The CD74HC595E uses two independent 8-bit registers: a shift register clocked by SRCLK that captures serial data bit-by-bit, and a storage register clocked by RCLK that transfers all 8 bits simultaneously to the outputs only on a rising latch edge. This means the 8 output pins remain stable at their previous values throughout the 8-bit shift sequence, and only update atomically when RCLK is pulsed, eliminating intermediate glitch states that could cause LED flicker or relay chatter.
At what maximum clock frequency can CD74HC595E shift data reliably at 5 V supply?
The CD74HC595E supports shift clock (SRCLK) frequencies up to 25 MHz at 5 V supply, allowing an 8-bit word to be loaded in 320 ns for a complete output update cycle including the RCLK latch pulse. At 3.3 V supply, maximum frequency decreases to approximately 15 MHz due to increased propagation delays, still fast enough for SPI-connected LED, display, and relay control applications.
How many CD74HC595E devices can be cascaded together, and what microcontroller pins are required?
Any number of CD74HC595E devices can be cascaded by connecting the QH' serial output of one stage to the SER input of the next, sharing common SRCLK and RCLK lines. A chain of 8 devices provides 64 outputs while requiring only 3 microcontroller pins — data (SER), shift clock (SRCLK), and latch clock (RCLK). Each device adds 8 clock cycles per update, so a 4-device chain of 32 outputs at 25 MHz completes one full refresh in approximately 1.3 µs.
When would CD74HC595E in PDIP-16 be chosen over the SOIC-16 surface-mount variant?
CD74HC595E in 16-pin PDIP is chosen for prototyping on breadboards, hand-soldered through-hole PCB assemblies, or educational kits where component placement does not require automated SMT pick-and-place. The 2.54 mm through-hole pitch withstands repeated insertion and removal better than SOIC-16's 1.27 mm SMD pads. For production runs requiring automated assembly or space-constrained designs below 5 mm x 4 mm component area, the equivalent CD74HC595 in SOIC-16 package is preferred.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
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| 100+ | $1.1100 | $111.00 |
| 250+ | $1.0800 | $270.00 |
| 1000+ | $0.7652 | $765.20 |
| 10000+ | $0.6822 | $6822.00 |
| 100000+ | $0.5716 | $57160.00 |
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