SN74ALS165DE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74ALS165DE4 is an 8-bit parallel-load serial-shift register from Texas Instruments ALS logic family, operating at up to 45 MHz in a 16-pin SOIC package. It accepts 8 parallel inputs and shifts data out serially, with 8 mA output drive and 50 pF load capacitance. Ideal for bus expansion, keyboard scanning, and parallel-to-serial data conversion in embedded and industrial systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ALS165DE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74ALS165DE4?
- 8-bit parallel-in serial-out (PISO) shift register
- Maximum clock frequency of 45 MHz
- Synchronous parallel load and right-shift operation
- 8 mA output current drive with 50 pF load rating
- 16-pin SOIC package (R-PDSO-G16)
- ALS family for low-power high-speed logic performance
What is SN74ALS165DE4 used for?
The SN74ALS165DE4 is used in microcontroller systems to expand the number of digital inputs via a single SPI-compatible 3-wire interface, enabling keyboard matrix scanning, DIP switch reading, and sensor bank polling over just 3 MCU pins. Its 45 MHz maximum clock rate supports high-speed data acquisition in industrial PLC input modules and instrumentation front-ends. It is also cascaded in series to read 16, 24, or 32 parallel inputs from a single serial stream.
What are the specifications of SN74ALS165DE4?
| YTEOL | 0 |
| Count Direction | RIGHT |
| Family | ALS |
| 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 | 45000000Hz |
| Max I(ol) | 0.008A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 24mA |
| Prop. Delay@Nom-Sup | 14ns |
| Propagation Delay (tpd) | 14ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| 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 | 45MHz |
| 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 |
| Country of Origin | Mexico |
Where can I find the SN74ALS165DE4 datasheet?
SN74ALS165DE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74ALS165DE4?
Compatible alternatives and drop-in replacements for SN74ALS165DE4:
Parallel In Serial Out, ALS Series, 8-Bit, Right Direction, Complementary Output, TTL, PDSO16
Frequently Asked Questions
How fast can the SN74ALS165DE4 shift data, and does clock speed affect load capacitance tolerance?
The SN74ALS165DE4 supports clock frequencies up to 45 MHz, enabling serial output of all 8 bits in under 180 ns at maximum speed. The device is rated for 50 pF load capacitance on its serial output, so traces longer than a few centimeters may require buffering to maintain signal integrity at full 45 MHz clock rates.
Can multiple SN74ALS165DE4 devices be cascaded to read more than 8 parallel inputs?
Yes, the serial output (QH) of one device feeds directly into the serial data input (DS) of the next, allowing multiple 8-bit stages to be daisy-chained. Reading 3 cascaded devices yields 24 parallel inputs over a single 3-wire SPI interface with a 24-clock burst, which is sufficient for many industrial digital input expansion applications.
What load current can the serial output of this shift register drive?
The output is rated for a maximum low-level sink current of 8 mA and 50 pF capacitance, which is compatible with standard logic inputs and optocoupler LED inputs for isolated I/O modules. If driving longer cables or higher-capacitance loads above 50 pF, an external buffer or line driver should be added to maintain timing margins at 45 MHz.
How does SN74ALS165DE4 compare to HC-family shift registers for industrial designs?
The ALS family operates at 5 V with propagation delays typically below 15 ns, providing faster switching than HC devices at the same 5 V supply. ALS also offers better noise margin than LSTTL and lower quiescent current than standard TTL, making SN74ALS165DE4 a well-balanced choice for 5 V industrial applications where 45 MHz throughput and moderate 8 mA drive capability are required.
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