SN74HC594DTE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HC594DTE4 is an 8-bit serial-in, serial/parallel-out shift register from Texas Instruments in a 16-pin SOIC package. It operates at up to 20 MHz with a 50 pF load capacitance and features a registered parallel output with asynchronous storage-register clear. This AEC-Q100-qualified device suits automotive and industrial serial data expansion designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC594DTE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit serial-to-parallel shift register operating up to 20 MHz at 50 pF load for high-speed I/O expansion
- Registered parallel output with independent asynchronous clear enables glitch-free data latching in control systems
- HC/UH logic family with wide 2 V to 6 V supply range for compatibility across 3.3 V and 5 V mixed-voltage designs
Applications
The SN74HC594DTE4 is used in microcontroller-based systems that need to expand GPIO counts using a 3-wire SPI or serial interface, offloading parallel output control for LED drivers, relay banks, and display segments. It fits automotive body control modules and industrial PLCs where the asynchronous clear and registered outputs simplify state-machine sequencing. The device also suits daisy-chained configurations driving up to 8 independent parallel outputs per chip in compact embedded designs.
Specifications
| YTEOL | 0 |
| Additional Feature | PARALLEL OUTPUT IS REGISTERED; ASYNCHRONOUS CLEAR FOR STORAGE REGISTER |
| Count Direction | RIGHT |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | SERIAL IN PARALLEL OUT |
| Max Frequency@Nom-Sup | 20000000Hz |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 70mA |
| Propagation Delay (tpd) | 250ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 24MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC594DTE4:
8-Bit, Right Direction, True Output, CMOS, PDSO16
8-Bit, Right Direction, True Output, CMOS, PDSO16
Serial In Parallel Out, HC/UH Series, 8-Bit, Right Direction, True Output, CMOS, PDSO16
Serial In Parallel Out, HC/UH Series, 8-Bit, Right Direction, True Output, CMOS, PDSO16
Serial In Parallel Out, HC/UH Series, 8-Bit, Right Direction, True Output, CMOS, PDSO16
Frequently Asked Questions
At what maximum clock frequency can the SN74HC594DTE4 shift data reliably?
The SN74HC594DTE4 supports a maximum shift frequency of 20 MHz at a load capacitance of 50 pF. This speed is sufficient for SPI-based GPIO expanders in microcontroller designs running at 3.3 V or 5 V, where the 8-bit parallel output updates must keep pace with control-loop cycle times in the microsecond range.
How does the asynchronous clear feature of the SN74HC594DTE4 help in safety-critical applications?
The asynchronous clear pin on the SN74HC594DTE4 resets all 8 bits of the storage register to logic-low immediately, independent of the shift clock. This allows a microcontroller or FPGA to deactivate all parallel outputs within nanoseconds during a fault condition, which is critical in automotive relay control and industrial motor-driver enable circuits operating at 5 V.
Can SN74HC594DTE4 devices be daisy-chained to drive more than 8 parallel outputs?
Yes, multiple SN74HC594DTE4 chips can be cascaded by connecting the serial output of one device to the serial input of the next, extending the parallel output bus to 16, 24, or 32 bits while using only 3 microcontroller pins. Each stage adds 8 outputs and the 20 MHz shift rate is maintained across the chain, making this a cost-effective approach for LED matrix and relay board designs.
What supply voltage range does the SN74HC594DTE4 support and which logic families is it compatible with?
The SN74HC594DTE4 operates from 2 V to 6 V supply, placing it within the HC/UH family that interfaces directly with 3.3 V CMOS microcontrollers and 5 V TTL-level logic. Its 16-pin SOIC footprint is footprint-compatible with many competing 8-bit shift registers, simplifying board-level substitution in existing designs.
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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.
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