Part A
74HC164D
도시바 반도체 및 스토리지
- Lifecycle
- Active
- Stock
- 2726 PCS
- Package
- SOIC-8
- Series
- 논리 - 위치 이동 레지스터
Replacement verdict
Not a drop-in replacement
The 74HC164D and 74HC165D,653 are not functionally interchangeable despite sharing the same 74HC logic family and SO-16 package. The 74HC164D is an 8-bit serial-in/parallel-out shift register, while the 74HC165D,653 is an 8-bit parallel-in/serial-out shift register. Their data flow direction, pin function assignments, and control signal sets differ fundamentally, so substituting one for the other requires a complete circuit redesign rather than a direct swap.
Different shift direction
Different pin function
Different control logic
Different data flow
Parts at a glance
Part B
74HC165D,653
넥스페리아 USA 주식회사
- Lifecycle
- Active
- Stock
- 9205 PCS
- Series
- 논리 - 위치 이동 레지스터
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC164D | 74HC165D,653 | Why it matters |
|---|---|---|---|
| Logic Function | 8-bit serial-in/parallel-out shift register | 8-bit parallel-in/serial-out shift register | Defines the direction of data conversion; these parts are not functionally interchangeable as they perform opposite serial/parallel conversions. |
| Data Input Type | Serial (2 inputs, AND-gated) | Parallel (8 inputs) plus serial input | Determines how data is loaded into the device; affects system architecture and required control signals. |
| Data Output Type | Parallel (8 outputs, Q0-Q7) | Serial (QH) plus complementary serial (QH̅) | Determines how data is read out; parallel outputs drive multiple lines while serial output requires fewer pins. |
| Number of Pins | 14 | 16 | Different package pin counts mean the parts are not footprint-compatible and cannot be dropped into the same PCB layout. |
| Package Type | SO14 (SOIC-14) | SO16 (SOIC-16) | Physical package differences prevent direct substitution without PCB redesign. |
| Control Inputs | Clear (CLR), Clock (CP) | Shift/Load (SH/LD), Clock (CP), Clock Inhibit (CE) | Different control signal sets require different driving logic and timing considerations in the host system. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both operate over the standard HC-family supply range, allowing use in 3.3 V and 5 V systems. |
| Logic Family | HC (High-speed CMOS) | HC (High-speed CMOS) | Same logic family ensures compatible input/output voltage thresholds and drive characteristics. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings allow use in the same industrial and automotive-grade environments. |
| Maximum Clock Frequency | ~78 MHz (at 4.5 V) | ~56 MHz (at 4.5 V) | Different maximum clock speeds affect the achievable data throughput in high-speed serial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC164D | 74HC165D,653 |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Shift Register | Shift Register |
| Output Type | Push-Pull | Complementary |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Function | Serial to Parallel | Parallel or Serial to Serial |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | 74HC165 |
Frequently asked questions
What are the primary functional differences between the 74HC164D and the 74HC165D,653?
The 74HC164D is an 8-bit serial-in/parallel-out shift register, while the 74HC165D,653 is an 8-bit parallel-in/serial-out shift register. The 74HC164D accepts serial data and outputs it in parallel, whereas the 74HC165D,653 accepts parallel data and outputs it serially.
Are the 74HC164D and 74HC165D,653 pin-compatible?
No. The 74HC164D and 74HC165D,653 have different pin configurations because their data flow directions and control signals differ. The 74HC164D has serial inputs and parallel outputs, while the 74HC165D,653 has parallel inputs, a serial output, and additional control pins such as SH/LD and CLK INH.
Can the 74HC164D and 74HC165D,653 operate at the same supply voltage?
Yes. Both devices are 74HC series CMOS logic ICs and typically operate over a supply voltage range of 2.0 V to 6.0 V, with 5.0 V being a common nominal operating voltage.
What is the function of the 74HC164D in a circuit?
The 74HC164D is an 8-bit serial-in/parallel-out shift register. It converts serial data on its inputs into parallel outputs, commonly used for expanding output pins on a microcontroller or driving multiple outputs from a single serial data stream.
What is the function of the 74HC165D,653 in a circuit?
The 74HC165D,653 is an 8-bit parallel-in/serial-out shift register. It captures parallel data from eight inputs and shifts it out serially, commonly used for expanding input pins on a microcontroller or reading multiple parallel signals through a single serial interface.
Do the 74HC164D and 74HC165D,653 have the same package type?
Both devices are commonly available in SOIC-14 packages. The 74HC164D is typically supplied in a 14-pin SOIC package, and the 74HC165D,653 is also supplied in a 14-pin SOIC package. However, the pin functions differ between the two devices.
Can the 74HC164D and 74HC165D,653 be used together in the same system?
Yes. They can be used together in the same system because they perform complementary functions. The 74HC164D can drive parallel outputs from serial data, while the 74HC165D,653 can read parallel inputs into serial data, allowing bidirectional I/O expansion around a microcontroller.
Are the 74HC164D and 74HC165D,653 interchangeable in a design?
No. They are not interchangeable because they perform opposite data conversion functions and have different pinouts. The 74HC164D is serial-in/parallel-out, while the 74HC165D,653 is parallel-in/serial-out. Substitution requires redesign of the circuit and validation against the manufacturer datasheets.