Part A
74HC541D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5041 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The 74HC541D and 74HC540D,652 are functionally compatible octal buffer/line driver ICs sharing identical logic family, package, and supply characteristics, but they differ in output configuration and pinout, so the 74HC541D is not a direct drop-in replacement for the 74HC540D,652 without accounting for the inverted outputs and pin assignment differences.
Logic Function
High match
Package Type
High match
Output Type
Validation required
Pin Configuration
Validation required
Parts at a glance
Part B
74HC540D,652
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 2550 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
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 | 74HC540D,652 | Why it matters |
|---|---|---|---|
| Logic Function | Octal buffer/line driver with 3-state outputs, non-inverting | Octal buffer/line driver with 3-state outputs, inverting | The inverting vs non-inverting behavior changes the logic polarity, so the parts are not functionally interchangeable without accounting for signal inversion. |
| Output Type | 3-state, non-inverting | 3-state, inverting | Output polarity determines whether the received logic level matches the input, directly affecting circuit behavior. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Both devices operate over the same supply range, allowing use in similar 2 V to 6 V logic systems. |
| Number of Channels | 8 | 8 | Matching channel count ensures the same number of signals can be buffered or driven. |
| Output Drive Current | ±6 mA | ±6 mA | Similar output drive capability means comparable fan-out and load-driving performance. |
| Propagation Delay | Typically 13 ns at 4.5 V | Typically 13 ns at 4.5 V | Equivalent propagation delay supports similar timing performance in high-speed digital circuits. |
| Package Type | SOIC-20 | SOIC-20 | Identical package and pin count allow the same PCB footprint and assembly process. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Same temperature range ensures both parts can be used in industrial and automotive-grade environments. |
| Pin Count | 20 | 20 | Matching pin count supports drop-in compatibility at the package level. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC541D | 74HC540D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Buffer, Non-Inverting | Buffer, Inverting |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | 7.8mA, 7.8mA | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the main functional difference between the 74HC541D and the 74HC540D,652?
The 74HC541D is an octal non-inverting buffer/line driver with 3-state outputs, while the 74HC540D,652 is an octal inverting buffer/line driver with 3-state outputs. Both are 74HC CMOS logic devices, but the 74HC541D passes the input signal to the output without inversion, whereas the 74HC540D,652 inverts the signal.
Are the 74HC541D and 74HC540D,652 pin-compatible?
Yes, both devices are typically offered in the same package types, such as SOIC-20 or TSSOP-20, and share the same pinout. This allows them to be used in the same PCB footprint, but the inverting versus non-inverting behavior must be accounted for in the circuit design.
What is the difference in output enable logic between the 74HC541D and the 74HC540D,652?
Both devices have two active-low output enable pins (OE1 and OE2). When either enable pin is high, the outputs are in a high-impedance state. The enable logic is identical for both parts; the difference lies only in the signal inversion of the data path.
Can the 74HC541D and 74HC540D,652 be used interchangeably in a design?
They are not functionally interchangeable without design changes because one is non-inverting and the other is inverting. However, they are pin-compatible, so a designer could swap them if the inversion is compensated elsewhere in the signal chain or if the logic polarity is not critical.
What are the typical supply voltage and logic family specifications for these devices?
Both the 74HC541D and 74HC540D,652 are 74HC high-speed CMOS devices. They typically operate over a supply voltage range of 2 V to 6 V, with standard 74HC input and output characteristics. For exact limits and timing parameters, refer to the manufacturer datasheet.
What is the difference in propagation delay between the 74HC541D and the 74HC540D,652?
Propagation delay is essentially the same for both devices because they share the same 74HC process and similar output drive circuitry. Any minor differences are within manufacturing tolerances and should be verified from the specific manufacturer datasheet for the exact part number.
Do both the 74HC541D and 74HC540D,652 have 3-state outputs?
Yes, both devices feature 3-state outputs that can be placed in a high-impedance state via the output enable pins. This allows them to be used in bus-oriented applications where multiple devices share a common data line.
Which device is better for driving a bus with active-low signals?
If the bus requires active-low assertion, the 74HC540D,652 inverting buffer may be more suitable because it inverts the input. The 74HC541D would require an additional inversion stage or logic change to achieve the same polarity. The choice depends on the overall system logic design.