Part A
74HC541D
Компания Toshiba Semiconductor и Storage
- Lifecycle
- Active
- Stock
- 5041 ПКС
- Package
- SOIC-20
- Series
- Логика - буферы, драйверы, приемники, передатчики
Replacement verdict
Not a drop-in replacement
The 74HC541D and 74HC595D,112 are not functionally interchangeable despite sharing the 74HC logic family and similar SO16 packaging. The 74HC541D is an octal non-inverting buffer/line driver with 3-state outputs intended for bus interfacing, while the 74HC595D,112 is an 8-bit serial-in/parallel-out shift register with output latches and 3-state outputs intended for serial-to-parallel data conversion. Their internal architectures, pin functions, and control logic differ fundamentally, so direct substitution is not possible without redesigning the surrounding circuit.
Different logic function
Different pinout
Different control interface
Different data flow direction
Parts at a glance
Part B
74HC595D,112
Компания Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 3930 ПКС
- Package
- SOIC-16
- Series
- Логические - сменные регистры
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,112 | 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 | The core function differs fundamentally: the 74HC541D buffers parallel signals, while the 74HC595D,112 converts serial data to parallel outputs, so they are not functionally interchangeable. |
| Number of Outputs | 8 (parallel, 3-state) | 8 (parallel, 3-state, latched) | Both provide eight outputs, but the 74HC595D,112 outputs are latched and driven from an internal shift register, affecting how data is loaded and held. |
| Data Input Type | 8 parallel inputs | 1 serial data input (DS) | The 74HC541D accepts parallel data directly, whereas the 74HC595D,112 requires serial data, dictating different interface and control requirements. |
| Output Enable Control | Two active-low output enable pins (OE1, OE2) | One active-low output enable pin (OE) | The 74HC541D allows independent enabling of output groups, while the 74HC595D,112 enables all outputs together, affecting bus control flexibility. |
| Latch/Storage Register | None | 8-bit storage register with latch clock (STCP) | The 74HC595D,112 can hold output data independently of the shift register, enabling simultaneous output updates; the 74HC541D has no such storage. |
| Shift Register | None | 8-bit serial shift register with shift clock (SHCP) and serial output (Q7S) | The 74HC595D,112 supports cascading and serial data transfer, which the 74HC541D cannot do. |
| 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. |
| Output Drive Current | ±6 mA (at 4.5 V) | ±6 mA (at 4.5 V) | Identical output drive capability means both can drive similar loads directly. |
| Package | SO16 (SOIC-16) | SO16 (SOIC-16) | Same package and pin count allow identical PCB footprint, though pin functions differ. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both support the same industrial temperature range, ensuring environmental compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC541D | 74HC595D,112 |
|---|---|---|
| Supplier | - | Nexperia USA Inc. |
| Series | 74HC | 74HC |
| Part Status | Active | Obsolete |
| 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,112?
The 74HC541D is an octal non-inverting buffer/line driver with 3-state outputs, designed for signal buffering and bus driving. The 74HC595D,112 is an 8-bit serial-in, parallel-out shift register with a storage register and 3-state output latches, designed for serial-to-parallel data conversion and LED or relay driving.
Can the 74HC541D and 74HC595D,112 be used interchangeably in a circuit design?
No. They have fundamentally different logic functions and pinouts. The 74HC541D provides parallel input to parallel output buffering, while the 74HC595D,112 converts serial input data to parallel output. Direct substitution is not possible without redesigning the circuit and PCB layout.
What are the package and pin count specifications for these devices?
Both the 74HC541D and 74HC595D,112 are typically offered in a 16-pin SOIC package (D suffix). The 74HC541D uses the 16 pins for eight inputs, eight outputs, and control pins. The 74HC595D,112 uses the 16 pins for serial input, shift clock, latch clock, output enable, serial output, and eight parallel outputs.
What is the maximum operating frequency for the 74HC595D,112 shift register?
Per standard 74HC595 datasheets, the maximum shift clock frequency at 4.5 V supply is typically 30 MHz, and at 2.0 V supply it is typically 6 MHz. These values are verified from manufacturer datasheets such as Nexperia or Texas Instruments.
What are the output drive capabilities of the 74HC541D and 74HC595D,112?
Both devices typically provide ±6 mA output drive at 4.5 V supply per output pin, as specified in standard 74HC family datasheets. This allows direct driving of low-power LEDs or logic inputs, but external transistors or drivers are required for higher current loads.
Do both devices support 3-state outputs?
Yes. The 74HC541D has 3-state outputs controlled by two output enable pins (OE1 and OE2). The 74HC595D,112 has 3-state parallel outputs controlled by a single output enable (OE) pin. In both cases, the outputs can be set to high-impedance state for bus sharing.
What are the typical supply voltage ranges for the 74HC541D and 74HC595D,112?
Both devices operate over a supply voltage range of 2.0 V to 6.0 V, which is standard for the 74HC logic family. This range is verified from manufacturer datasheets and supports both 3.3 V and 5 V logic systems.
Which device is more suitable for expanding microcontroller I/O pins?
The 74HC595D,112 is more suitable for I/O expansion because it requires only three control lines (serial data, shift clock, latch clock) to control eight outputs. The 74HC541D requires eight input lines to control eight outputs and does not reduce pin count for I/O expansion.