Part A
74HC595D
Компания Toshiba Semiconductor и Storage
- Lifecycle
- Active
- Stock
- 4369 ПКС
- Package
- SOIC-16
- Series
- Логические - сменные регистры
Replacement verdict
Not a drop-in replacement
The 74HC595D and 74HC541D,653 are not functionally interchangeable. The 74HC595D is a serial-in, parallel-out shift register with an internal 8-bit storage register and tri-state output latches, while the 74HC541D,653 is an octal non-inverting buffer/line driver with tri-state outputs. Their logic functions, pinouts, and control interfaces differ fundamentally, so direct substitution is not possible without redesigning the surrounding circuitry.
Different logic function
Different output type
Different pinout
Different control interface
Parts at a glance
Part B
74HC541D,653
Компания NXP USA Inc.
- Lifecycle
- Active
- Stock
- 6304 ПКС
- Package
- SOIC-20
- Series
- Логика - буферы, драйверы, приемники, передатчики
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC595D | 74HC541D,653 | Why it matters |
|---|---|---|---|
| Logic Function | 8-bit serial-in/parallel-out shift register with output latches | 8-bit non-inverting buffer/line driver with 3-state outputs | The core function determines whether the device can serialize data (shift register) or only buffer/amplify signals, making them non-interchangeable for most designs. |
| Output Type | Parallel outputs with latches (registered) | 3-state non-inverting outputs | Latched parallel outputs allow stable data holding, while 3-state outputs enable bus sharing; this affects system architecture and bus contention behavior. |
| Number of Pins | 16 | 20 | Different pin counts mean incompatible footprints and PCB layouts, preventing direct drop-in replacement. |
| Package | SO16 (SOIC-16) | SO20 (SOIC-20) | Package size and lead pitch must match the board footprint for physical assembly and thermal considerations. |
| Control Inputs | Serial data, shift clock, latch clock, output enable, reset | Output enable (OE1, OE2) | Different control signal sets dictate how the device is driven; the shift register requires clocking and latching, while the buffer only needs enable signals. |
| Data Flow Direction | Serial input to parallel output | Parallel input to parallel output | Data conversion direction determines suitability for serial-to-parallel expansion versus simple signal buffering. |
| Propagation Delay (typical) | ~14 ns at 4.5 V | ~10 ns at 4.5 V | Timing differences affect maximum operating frequency and signal integrity in high-speed applications. |
| Output Drive Current | ±6 mA (standard HC) | ±7.8 mA (standard HC) | Drive strength impacts fan-out capability and ability to drive LEDs or other loads directly. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both support the same HC-family voltage range, allowing similar power supply design, though this alone does not ensure interchangeability. |
| Primary Application | GPIO expansion, LED matrix driving, serial data conversion | Bus buffering, signal driving, memory address buffering | Intended use cases differ fundamentally, so selecting the wrong device will not fulfill the system requirement. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC595D | 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 | Tri-State | 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 74HC595D and the 74HC541D,653?
The 74HC595D is an 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register and 3-state parallel outputs. The 74HC541D,653 is an 8-bit non-inverting buffer/line driver with 3-state outputs. The 74HC595D serializes data input and provides parallel outputs, while the 74HC541D,653 only buffers and drives 8 parallel input signals to its outputs without any serial-to-parallel conversion or internal storage register.
Can the 74HC595D and 74HC541D,653 be used interchangeably in a design?
No. They are not functionally interchangeable. The 74HC595D provides serial-to-parallel conversion with output latching, while the 74HC541D,653 is a straight 8-bit non-inverting buffer with 3-state outputs. Pinouts and control signals also differ, so direct substitution without redesign is not possible.
What are the package and pin count differences between the 74HC595D and the 74HC541D,653?
The 74HC595D is typically supplied in a 16-pin SOIC package (SO16). The 74HC541D,653 is supplied in a 20-pin SOIC package (SO20). The 74HC541D,653 has additional pins for output enable and more supply/ground connections compared to the 74HC595D.
Do both devices operate at the same supply voltage range and logic family?
Yes. Both the 74HC595D and the 74HC541D,653 belong to the 74HC high-speed CMOS logic family. They typically operate over a supply voltage range of 2.0 V to 6.0 V, with standard 74HC input and output voltage thresholds.
What are the output drive capabilities of the 74HC595D and the 74HC541D,653?
Both devices provide standard 74HC output drive. The 74HC595D has 3-state parallel outputs capable of driving typical CMOS loads. The 74HC541D,653 is specifically designed as a line driver/buffer with 3-state outputs and similar standard 74HC drive strength. Neither device is intended for high-current power driving without external circuitry.
How do the control signals differ between the 74HC595D and the 74HC541D,653?
The 74HC595D uses a serial data input (DS), a shift clock (SHCP), a storage register clock (STCP), an output enable (OE), and a serial data output (Q7S) for cascading. The 74HC541D,653 uses eight parallel data inputs (A1–A8), two output enable pins (OE1 and OE2), and eight parallel outputs (Y1–Y8). There is no serial data path or shift register in the 74HC541D,653.
Which device is more suitable for expanding microcontroller I/O pins?
The 74HC595D is more suitable for expanding microcontroller I/O because it converts 3 serial control lines into 8 parallel outputs and supports cascading multiple devices for further expansion. The 74HC541D,653 is used to buffer or drive existing parallel signals and does not increase the number of available I/O lines.
Are the 74HC595D and 74HC541D,653 compatible with 3.3 V logic systems?
Both devices are 74HC family parts and can operate at 3.3 V supply. At 3.3 V, their input thresholds and output levels are compatible with standard 3.3 V CMOS logic. However, always verify the specific manufacturer datasheet for the exact part number and package to confirm DC and AC characteristics at the intended supply voltage.