SN74HC165PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74HC165PWG4 is an 8-bit parallel-in/serial-out shift register in the HC/UH logic family. It operates at up to 29 MHz with 50 pF load capacitance and is housed in a 16-pin TSSOP package. Available in tube packaging with RoHS-compliant e4 termination finish for modern PCB assembly.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC165PWG4 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
What are the key features of SN74HC165PWG4?
- 8-bit parallel-in serial-out operation enables scanning of 8 digital inputs over a 2-wire SPI-compatible interface
- Maximum clock frequency of 29 MHz at nominal supply allows high-speed serial data acquisition in real-time systems
- HC/UH family logic with 50 pF rated load capacitance ensures robust drive capability on long PCB traces
- 16-pin TSSOP package minimizes board area while supporting cascading of multiple devices for >8-bit expansion
What is SN74HC165PWG4 used for?
The SN74HC165PWG4 is widely used for expanding digital input capacity in microcontroller designs by converting 8 parallel GPIO signals into a serial stream readable over SPI with only 3 MCU pins. It suits keyboard matrix scanning, DIP switch reading, and sensor status aggregation in industrial control panels and embedded systems. Its 29 MHz operation and cascadable architecture make it practical for reading banks of 16, 24, or more inputs in a single daisy-chained shift-register chain.
What are the specifications of SN74HC165PWG4?
| YTEOL | 0 |
| Additional Feature | SISO OPERATION ALSO AVAILABLE |
| Count Direction | RIGHT |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | PARALLEL IN SERIAL OUT |
| Max Frequency@Nom-Sup | 29000000Hz |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 50mA |
| Propagation Delay (tpd) | 225ns |
| 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 | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 29MHz |
| 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 |
Where can I find the SN74HC165PWG4 datasheet?
SN74HC165PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HC165PWG4?
Compatible alternatives and drop-in replacements for SN74HC165PWG4:
8-Bit, Right Direction, Complementary Output, CMOS, PDSO16
Frequently Asked Questions
How many inputs can SN74HC165PWG4 read simultaneously, and how can the count be expanded beyond 8?
The SN74HC165PWG4 reads 8 parallel inputs simultaneously in a single load-and-shift cycle. To expand beyond 8 bits, multiple devices can be cascaded by connecting the serial output (QH) of one chip to the serial input (SER) of the next, sharing the same clock and load lines. Each added device appends another 8 bits, so 3 cascaded ICs cover 24 inputs on just 3 MCU pins, well within the 29 MHz maximum clock rate.
What supply voltage and clock frequency limits apply to SN74HC165PWG4 in an industrial 5 V system?
In an HC-family device powered at 5 V, the SN74HC165PWG4 supports a maximum clock frequency of 29 MHz with a 50 pF load capacitance. At lower supply voltages such as 3.3 V the maximum frequency decreases according to the datasheet timing tables. For typical industrial PLC or microcontroller applications running SPI at 1 MHz to 10 MHz, the device operates well within its rated limits at both 3.3 V and 5 V supply rails.
Why choose the TSSOP-16 package of SN74HC165PWG4 over a DIP-16 variant for a new PCB design?
The 16-pin TSSOP package has a pin pitch of 0.65 mm and a body width of approximately 4.4 mm, consuming far less PCB area than a 7.62 mm wide DIP-16 package. Surface-mount assembly with the TSSOP footprint is compatible with automated pick-and-place and reflow processes, reducing assembly cost and board size. For modern compact designs such as handheld devices or dense control boards, the TSSOP-16 is the preferred choice.
Can SN74HC165PWG4 be used directly with a 3.3 V microcontroller without level-shifting its outputs?
Yes, when the SN74HC165PWG4 is powered from a 3.3 V supply its output high level (VOH) meets the logic-high threshold of 3.3 V CMOS microcontrollers. The HC family specifies VOH minimum at VCC minus 0.1 V, which is approximately 3.2 V at 3.3 V supply — sufficient to drive standard 3.3 V inputs directly. No external level-shifter is required in a 3.3 V system, reducing component count and simplifying the design.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
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
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit