CD74HC165MTE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74HC165MTE4 is an 8-bit parallel-in, serial-out shift register from Texas Instruments using HC CMOS technology. It operates at up to 20MHz with parallel load and serial shift modes, supporting both PISO and SISO operation in a 16-pin SOIC tape-and-reel package. Ideal for expanding digital input capabilities in microcontroller and FPGA designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC165MTE4 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
Key Features
- 8-bit parallel-in/serial-out (PISO) shift register with complementary Q and Q-bar serial outputs, enabling daisy-chaining for multi-byte SPI input expansion
- Dual operating mode supporting both parallel-load (PISO) and serial-in/serial-out (SISO) operation for flexible data serialization needs
- HC CMOS technology with up to 20MHz clock frequency and 2V–6V supply range in a 16-pin SOIC (MT suffix: tape-and-reel, RoHS-compliant) package
Applications
The CD74HC165MTE4 is widely used for expanding digital input channels in microcontroller systems by converting 8 parallel GPIO signals to a single SPI-compatible serial stream. Multiple devices can be cascaded to read 16, 24, or more parallel inputs using only three microcontroller pins (clock, load, and serial data). It is also applied in keyboard matrix scanning, industrial sensor polling, and data acquisition systems where minimizing the number of host interface pins is critical.
Specifications
| Pbfree Code | Yes |
| 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 | 20000000Hz |
| Max I(ol) | 0.0052A |
| 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 | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 32ns |
| Propagation Delay (tpd) | 250ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74HC165MTE4:
Parallel In Serial Out, HC/UH Series, 8-Bit, Right Direction, Complementary Output, CMOS, PDSO16
Parallel In Serial Out, HC/UH Series, 8-Bit, Right Direction, Complementary Output, CMOS, PDSO16
Frequently Asked Questions
How does the CD74HC165MTE4 work as a parallel-to-serial converter?
The CD74HC165MTE4 operates in two phases: first, a parallel load pulse (PL, active LOW) latches all 8 data inputs (D0–D7) simultaneously into the internal registers. Then, clock pulses shift the data out serially through the Q output (MSB first), one bit per clock cycle. After 8 clock pulses, all 8 bits have been transmitted. Multiple devices can be daisy-chained by connecting Q to the serial input (DS) of the next device.
What is the maximum operating frequency of the CD74HC165MTE4?
The CD74HC165MTE4 operates at a maximum clock frequency of 20MHz at its nominal supply voltage. This is sufficient for most SPI-based input expansion tasks in microcontroller systems, where SPI buses typically run at 1MHz to 10MHz for input register reading cycles.
What supply voltage range does the CD74HC165MTE4 support?
The CD74HC165MTE4 operates from a supply voltage (VCC) of 2V to 6V, spanning the entire HC CMOS range. This makes it compatible with 3.3V microcontrollers, 5V AVR/PIC systems, and other voltage domains without requiring a separate level translator in most standard applications.
What does the 'MT' suffix mean in CD74HC165MTE4?
In the part number CD74HC165MTE4, 'M' designates the 16-pin SOIC (Small Outline Integrated Circuit) package, 'T' indicates tape-and-reel packaging for automated SMT assembly, and 'E4' confirms RoHS compliance and lead-free (Pb-free) construction. This packaging is standard for production-volume PCB assembly using pick-and-place machines.
How many CD74HC165MTE4 devices can be cascaded together?
There is no fixed limit to the number of CD74HC165MTE4 devices that can be cascaded. Each additional device adds 8 more parallel input bits to the serial chain. A common microcontroller SPI interface can read 4 cascaded devices (32 inputs) in a single 32-clock transfer cycle. Practical limits depend on clock signal integrity, total propagation delay across the chain, and the SPI timing constraints of the host controller.
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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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