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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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
How to Choose a 3528 SMD Indicator LED for Blue Status Lighting: Selection Guide
A practical 3528 SMD indicator LED selection guide using 150141BS73100 and related Wurth 150141 variants for blue status lighting.
Jul 5, 2026
BAS70KFILM Design Guide for Low-Leakage Signal Clamping and RF Detector Inputs
Practical BAS70KFILM design guidance for signal clamps, RF detector inputs, leakage control, capacitance, layout, and sourcing alternatives.
Jul 5, 2026
How to Choose a BAS70 Schottky Diode for Signal Clamping: Selection Guide
A practical BAS70KFILM and BAS70-family Schottky diode selection guide for signal clamping, RF detection, leakage, and topology choices.
Jul 4, 2026
AMC1202DWVR Design Guide for Isolated Current Sensing
Practical AMC1202DWVR design guide covering shunt sizing, isolation layout, input filtering, ADC scaling, and sourcing choices.
Jul 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.
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.”