Part A
74HC153D
Toshiba Halbleiter und Speicher
- Lifecycle
- Active
- Stock
- 5590 Stückzahl
- Package
- SOIC-20
- Series
- Logic.Signal Schalter, Multiplexer, Decoder
Replacement verdict
Not a drop-in replacement
The 74HC153D and 74HC165D,653 are functionally distinct logic ICs that cannot serve as substitutes for one another. The 74HC153D is a dual 4-to-1 multiplexer with data selection capability, while the 74HC165D,653 is an 8-bit parallel-in/serial-out shift register. Their internal architectures, pin functions, and signal flow directions are fundamentally different, making direct replacement impossible without complete circuit redesign.
Different logic function
Different data flow direction
Different pin function assignment
Different input/output configuration
Parts at a glance
Part B
74HC165D,653
Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 9205 Stückzahl
- Series
- Logic-Shift-Register
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC153D | 74HC165D,653 | Why it matters |
|---|---|---|---|
| Logic Function | Dual 4-input multiplexer | 8-bit parallel-in/serial-out shift register | The core function determines whether the device selects between data inputs or converts parallel data to serial form, making them non-interchangeable in most designs. |
| Number of Inputs | 8 data inputs (two groups of 4) | 9 inputs (8 parallel data plus serial input) | Input count affects how many signals can be handled and the required board routing and pin assignment. |
| Number of Outputs | 2 outputs (one per multiplexer) | 2 outputs (Q and complementary Q) | Output configuration determines how the device interfaces with downstream logic or a serial bus. |
| Data Transfer Mode | Combinational selection | Synchronous serial shifting | Combinational versus sequential operation dictates whether a clock is required and how timing is managed in the system. |
| Clock Requirement | None | Yes (shift clock and clock inhibit) | A clocked device needs timing signals and setup/hold considerations, while a purely combinational device does not. |
| Control Inputs | Select inputs and active-low enable per multiplexer | Shift/load, clock, clock inhibit, and serial input | Control pin differences affect the logic interface and the complexity of the driving circuitry. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Matching supply ranges allow both devices to operate in the same 3.3 V or 5 V logic systems without level shifting. |
| Logic Family | HC (high-speed CMOS) | HC (high-speed CMOS) | Same logic family ensures compatible input thresholds, output drive, and noise margins when used together. |
| Propagation Delay | Typically around 14 ns at 5 V | Typically around 15 ns at 5 V | Propagation delay influences maximum operating speed and timing margins in high-frequency designs. |
| Package | SO14 (SOIC-14) | SO16 (SOIC-16) | Different package sizes and pin counts prevent direct drop-in replacement on the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC153D | 74HC165D,653 |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | - | Shift Register |
| Output Type | - | Complementary |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Function | - | Parallel or Serial to Serial |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | 74HC165 |
| Type | Multiplexer | - |
| Circuit | 2 x 4:1 | - |
| Independent Circuits | 2 | - |
| Current - Output High Low | 5.2mA, 5.2mA | - |
| Voltage Supply Source | Single Supply | - |
Frequently asked questions
What are the primary functional differences between the 74HC153D and the 74HC165D,653?
The 74HC153D is a dual 4-input multiplexer that selects one of four data inputs per section based on two select lines. The 74HC165D,653 is an 8-bit parallel-in/serial-out shift register used to convert parallel data to serial data. They serve different logic functions and are not functionally interchangeable.
Are the 74HC153D and 74HC165D,653 pin-compatible?
No. The 74HC153D is typically supplied in a 16-pin SOIC package, while the 74HC165D,653 is supplied in a 16-pin SOIC package as well, but their pin functions differ. The 74HC153D has multiplexer inputs, select lines, and outputs, whereas the 74HC165D,653 has parallel inputs, serial input, clock, shift/load, and serial output pins. They cannot be used as drop-in replacements.
Can the 74HC153D and 74HC165D,653 operate at the same supply voltage range?
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 V being the nominal operating voltage. Always verify the specific manufacturer datasheet for the exact part number being used.
What is the function of the 74HC153D in a digital circuit?
The 74HC153D contains two independent 4-to-1 multiplexers. Each multiplexer selects one of four data inputs (I0–I3) based on the state of two select inputs (S0, S1) and routes the selected input to a single output. It also includes an active-low enable input per multiplexer.
What is the function of the 74HC165D,653 in a digital circuit?
The 74HC165D,653 is an 8-bit parallel-in/serial-out shift register. It can load eight parallel data bits asynchronously and then shift them out serially on each clock pulse. It also supports serial input for cascading multiple devices to expand the shift register width.
Do both devices have the same output drive capability?
Both are 74HC series devices and typically provide standard CMOS output drive, which is usually ±4 mA at 5 V for balanced outputs. However, the 74HC153D has multiplexer outputs, while the 74HC165D,653 has a serial output (QH) and its complementary output (QH̅). The actual drive current should be confirmed from the specific manufacturer datasheet.
Can the 74HC153D be used to expand the input count of a 74HC165D,653?
Yes, in a system design, a 74HC153D multiplexer can be used to select among multiple parallel data sources before feeding the selected data into the parallel inputs of a 74HC165D,653 shift register. This allows more than eight parallel signals to be serialized using a single 74HC165D,653, but additional control logic is required.
Are the 74HC153D and 74HC165D,653 available in the same package type?
Both are commonly available in a 16-pin SOIC package (often designated with the suffix "D" for the 74HC153D and "D,653" for the 74HC165D,653). However, the package alone does not imply interchangeability; the internal die and pin functions are different.