Part A
74HC594D
東芝セミコンダクター・アンド・ストレージ
- Lifecycle
- Active
- Stock
- 1976 個数
- Package
- SOIC-16
- Series
- ロジック - シフトレジスタ
Replacement verdict
Not a drop-in replacement
The 74HC594D and 74HC541D,653 are not functionally interchangeable. The 74HC594D is an 8-bit serial-in/parallel-out shift register with output latches, while the 74HC541D,653 is an 8-bit non-inverting buffer/line driver with 3-state outputs. Their internal logic architecture, pin functions, and control signal behavior differ fundamentally, making direct substitution impossible without redesigning the surrounding circuit.
Different logic function
Different output type
Different control interface
Different pinout
Parts at a glance
Part B
74HC541D,653
パナソニック電子部品
- Lifecycle
- Active
- Stock
- 6304 個数
- Package
- SOIC-20
- Series
- ロジック - バッファ、ドライバ、レシーバ、トランシーバ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC594D | 74HC541D,653 | Why it matters |
|---|---|---|---|
| Logic Function | 8-bit serial-in/parallel-out shift register with output latches | 8-bit octal non-inverting buffer/line driver with 3-state outputs | The core function differs fundamentally; one shifts and latches serial data, the other buffers parallel data, so they are not functionally interchangeable. |
| Output Type | Parallel register outputs (push-pull) | 3-state non-inverting outputs | 3-state outputs allow bus sharing and high-impedance disconnection, which the shift register outputs do not provide. |
| Number of Outputs | 8 parallel outputs plus serial output | 8 parallel outputs | The shift register provides an additional serial output for cascading, which the buffer does not have. |
| Input Type | Serial data input with shift register clock and latch clock | 8 parallel data inputs with output enable | Data loading method differs; serial shifting versus parallel latching determines system architecture compatibility. |
| Control Inputs | Shift clock, latch clock, output enable, serial clear | Output enable (OE1, OE2) | Different control schemes mean the surrounding circuitry and timing signals cannot be reused directly. |
| 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, so power supply compatibility is identical. |
| Logic Family | 74HC CMOS | 74HC CMOS | Same logic family ensures compatible input/output voltage thresholds and noise margins. |
| Package | SO16 (SOIC-16) | SO20 (SOIC-20) | Different pin counts and package widths affect PCB footprint and layout compatibility. |
| Pin Count | 16 | 20 | Differing pin counts prevent drop-in replacement on the same footprint. |
| Propagation Delay (typical at 4.5 V) | Approximately 15 ns (shift clock to output) | Approximately 10 ns (input to output) | Timing differences affect maximum operating frequency and signal integrity in high-speed designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC594D | 74HC541D,653 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Shift Register | Buffer, Non-Inverting |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Output Type | Push-Pull | 3-State |
| Current - Output High Low | - | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Function | Serial to Parallel, Serial | - |
Frequently asked questions
What are the primary functional differences between the 74HC594D and the 74HC541D,653?
The 74HC594D is an 8-bit serial-in/parallel-out shift register with an output register and 3-state outputs, while the 74HC541D,653 is an 8-bit non-inverting buffer/line driver with 3-state outputs. The 74HC594D converts serial data to parallel data, whereas the 74HC541D,653 buffers and drives parallel data.
Are the 74HC594D and 74HC541D,653 pin-compatible?
No. The 74HC594D is typically supplied in a 16-pin SOIC package, and the 74HC541D,653 is supplied in a 20-pin SOIC package. They have different pin counts and pin functions, so they are not pin-compatible.
Can the 74HC594D and 74HC541D,653 be used interchangeably in a design?
No. They perform different logic functions. The 74HC594D is a serial-to-parallel shift register, and the 74HC541D,653 is an octal buffer/line driver. Substitution requires a complete redesign of the surrounding circuitry and control signals.
What are the output drive capabilities of the 74HC594D and 74HC541D,653?
Both devices are part of the 74HC family and typically provide standard CMOS output drive. The 74HC541D,653 is specifically designed as a line driver with 3-state outputs, while the 74HC594D also has 3-state parallel outputs. For exact current ratings, refer to the manufacturer datasheets.
Do both the 74HC594D and 74HC541D,653 operate at the same supply voltage range?
Yes. Both are 74HC series devices and typically operate over a supply voltage range of 2.0 V to 6.0 V. Always verify the specific operating conditions in the manufacturer datasheet.
What are the typical applications for the 74HC594D versus the 74HC541D,653?
The 74HC594D is used for serial-to-parallel data conversion, LED matrix control, and expanding output ports. The 74HC541D,653 is used for bus driving, buffering, and signal isolation in microprocessor systems.
Are the 74HC594D and 74HC541D,653 available in the same package types?
No. The 74HC594D is commonly available in SO16 (16-pin SOIC) and other 16-pin packages. The 74HC541D,653 is commonly available in SO20 (20-pin SOIC) and other 20-pin packages. Package options differ between the two devices.