CD74HCT165ME4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74HCT165ME4 is an 8-bit parallel-in serial-out shift register from Texas Instruments in a 16-pin SOIC package. It belongs to the HCT CMOS logic family, supports up to 18 MHz clock frequency, and features SISO operation for versatile serial data conversion. From $0.50 in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HCT165ME4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HCT165ME4?
- 8-bit parallel-in serial-out architecture efficiently converts parallel data to serial streams for SPI and microcontroller interfaces
- HCT family 5V CMOS inputs with TTL-compatible thresholds ensure direct interfacing with both CMOS and TTL logic systems
- Up to 18 MHz maximum clock frequency enables high-speed serial data transfer in demanding digital applications
- SISO operation option provides additional flexibility for cascading multiple shift registers to expand input width
What is CD74HCT165ME4 used for?
The CD74HCT165ME4 is widely used in microcontroller and FPGA systems to expand the number of digital inputs by converting parallel switch or sensor states into a serial bitstream over a standard SPI interface. It is commonly found in industrial control panels, keyboard matrix scanners, and test equipment where multiple binary signals must be read with minimal microcontroller I/O pins. Its HCT logic family compatibility allows direct connection to both legacy TTL circuits and modern CMOS-based digital systems.
What are the specifications of CD74HCT165ME4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | SISO OPERATION ALSO AVAILABLE |
| Count Direction | RIGHT |
| Family | HCT |
| 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 | 18000000Hz |
| Max I(ol) | 0.004A |
| 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) | 0.16mA |
| Prop. Delay@Nom-Sup | 50ns |
| Propagation Delay (tpd) | 60ns |
| 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 | CMOS |
| Temperature Grade | MILITARY |
| 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 |
| Country of Origin | Mexico |
Where can I find the CD74HCT165ME4 datasheet?
CD74HCT165ME4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HCT165ME4?
Compatible alternatives and drop-in replacements for CD74HCT165ME4:
8-Bit, Right Direction, Complementary Output, CMOS, PDSO16
Frequently Asked Questions
What is the function of the CD74HCT165ME4?
The CD74HCT165ME4 is an 8-bit parallel-in serial-out shift register that loads 8 parallel data bits simultaneously and then shifts them out serially on each clock edge. This allows a microcontroller to read 8 digital inputs using only 3 SPI lines, reducing the required I/O pin count significantly.
What logic family does the CD74HCT165ME4 belong to?
The CD74HCT165ME4 belongs to the HCT (High-speed CMOS with TTL-compatible inputs) logic family. It operates from a 5V supply with input switching thresholds compatible with TTL-level signals, making it suitable for mixed TTL/CMOS designs and direct connection to 5V TTL outputs without level translation.
What is the maximum operating frequency of the CD74HCT165ME4?
The CD74HCT165ME4 supports a maximum clock frequency of 18 MHz at nominal supply voltage, enabling fast serial data readout from all 8 parallel inputs. This bandwidth is more than adequate for keyboard scanning, switch debouncing, and other typical industrial and consumer input expansion applications.
Can multiple CD74HCT165ME4 devices be cascaded?
Yes, the CD74HCT165ME4 includes a serial input (SER) pin that allows daisy-chaining of multiple devices. By connecting the serial output of one chip to the serial input of the next, designers can cascade two or more ICs to read 16, 24, or more parallel inputs over a single 3-wire SPI interface with no additional microcontroller pins.
What package does the CD74HCT165ME4 use?
The CD74HCT165ME4 is available in a 16-pin SOIC (Small Outline Integrated Circuit) surface-mount package coded R-PDSO-G16. The ME4 suffix designates the military-grade temperature range (-55°C to 125°C) and RoHS-compliant lead-free construction, making it suitable for rugged environments beyond standard commercial temperature ranges.
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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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