Part A
74HC541D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5041 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The 74HC541D and 74HC595D,118 are not functionally interchangeable. The 74HC541D is an octal non-inverting buffer/line driver with 3-state outputs, while the 74HC595D,118 is an 8-bit serial-in/parallel-out shift register with output latches and 3-state outputs. Their logic functions, pinouts, and control interfaces differ fundamentally, so neither device can directly substitute for the other in an existing design.
Different logic function
Different pinout
Different control interface
Different data flow direction
Parts at a glance
Part B
74HC595D,118
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 2450 PCS
- Package
- SOIC-16
- Series
- Logic - Shift Registers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74HC541D | 74HC595D,118 | Why it matters |
|---|---|---|---|
| Logic Function | Octal buffer/line driver with 3-state outputs | 8-bit serial-in, serial/parallel-out shift register with output latches and 3-state outputs | Defines the core function; these devices are not functionally interchangeable as they perform fundamentally different logic operations. |
| Number of Bits | 8 | 8 | Both handle 8 bits, but the data path architecture differs (parallel buffer vs serial shift register). |
| Output Type | 3-state non-inverting | 3-state serial/parallel | Determines how outputs can be driven and shared on a bus; the 74HC541 drives all outputs simultaneously while the 74HC595 shifts data out serially. |
| Input Type | Parallel | Serial | Affects how data is loaded; parallel input allows simultaneous byte transfer, while serial input requires clocked bit-by-bit loading. |
| Control Inputs | Output enable (OE1, OE2) | Shift clock, latch clock, output enable, serial clear | Different control schemes mean the devices require different driving logic and timing considerations in a circuit. |
| Propagation Delay (typical) | ~12 ns at 4.5 V | ~14 ns at 4.5 V | Impacts maximum operating speed and timing margins in high-frequency designs. |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | Both are compatible with standard HC-family supply rails, allowing similar power supply design. |
| Output Drive Current | ±6 mA at 4.5 V | ±6 mA at 4.5 V | Determines fan-out and ability to drive loads such as LEDs or other logic inputs. |
| Package | SOIC-20 | SOIC-16 | Different pin counts and footprints prevent direct drop-in replacement on an existing PCB. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support industrial temperature ranges, suitable for similar environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC541D | 74HC595D,118 |
|---|---|---|
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Buffer, Non-Inverting | Shift Register |
| Output Type | 3-State | Tri-State |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Function | - | Serial to Parallel, Serial |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Current - Output High Low | 7.8mA, 7.8mA | - |
Frequently asked questions
What are the primary functional differences between the 74HC541D and the 74HC595D,118?
The 74HC541D is an octal non-inverting buffer/line driver with 3-state outputs, designed for signal buffering and bus driving. The 74HC595D,118 is an 8-bit serial-in, parallel-out shift register with a storage register and 3-state output latches, used for serial-to-parallel data conversion and I/O expansion.
Are the 74HC541D and 74HC595D,118 pin-compatible?
No. The 74HC541D is typically supplied in a 20-pin package (e.g., SO20), while the 74HC595D,118 is supplied in a 16-pin package (e.g., SO16). They have different pin counts and pin functions, so they are not pin-compatible.
Can the 74HC541D and 74HC595D,118 be used together in the same design?
Yes. They serve complementary roles. The 74HC595D,118 can expand output pins serially, and the 74HC541D can buffer or drive the resulting parallel signals, provided the logic levels and supply voltages are compatible.
What is the difference in output type between the 74HC541D and the 74HC595D,118?
The 74HC541D has 3-state non-inverting outputs controlled by two output-enable pins. The 74HC595D,118 has 3-state parallel outputs controlled by an output-enable pin, with data loaded from an internal storage register.
Which device is better suited for serial data input?
The 74HC595D,118 is designed for serial data input via its serial data input pin and shift register clock. The 74HC541D does not have serial input capability; it only buffers parallel data.
Do both devices operate at the same supply voltage range?
Both are 74HC family devices and typically operate over a supply voltage range of 2.0 V to 6.0 V. However, always verify the specific manufacturer datasheet for the exact part number and package.
What is the typical application difference between the 74HC541D and the 74HC595D,118?
The 74HC541D is commonly used for bus driving, signal buffering, and increasing fan-out. The 74HC595D,118 is commonly used for LED matrix control, GPIO expansion, and serial-to-parallel conversion in embedded systems.