Part A
74HC540D
Toshiba Semiconductor and Storage
- Lifecycle
- Active
- Stock
- 5312 PCS
- Package
- SOIC-20
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The 74HC540D and 74HC540D,652 are functionally equivalent octal inverting buffers with 3-state outputs from the same manufacturer, sharing identical logic function, package type, and electrical characteristics. The ,652 suffix denotes a tape-and-reel packing variant of the same die, making these parts interchangeable in design and application.
Logic Function
High match
Package Type
High match
Output Type
High match
Supply Voltage Range
High match
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 | 74HC540D | 74HC540D,652 | Why it matters |
|---|---|---|---|
| Manufacturer | Nexperia | Nexperia | Same manufacturer ensures consistent process, quality, and documentation for both parts. |
| Logic Family | 74HC | 74HC | Matching logic family guarantees compatible voltage thresholds and switching characteristics. |
| Function | Octal buffer/line driver, 3-state, inverting | Octal buffer/line driver, 3-state, inverting | Identical logic function is essential for direct functional substitutability. |
| Number of Channels | 8 | 8 | Channel count must match to drive the same number of signal lines. |
| Supply Voltage Range | 2.0 V to 6.0 V | 2.0 V to 6.0 V | Compatible supply range allows use in the same system power rails. |
| Output Type | 3-state | 3-state | 3-state outputs enable bus sharing and high-impedance isolation, critical for bus applications. |
| Package / Case | SO-20 (SOIC-20) | SO-20 (SOIC-20) | Same package footprint ensures drop-in PCB compatibility. |
| Mounting Type | Surface Mount | Surface Mount | Matching mounting type is required for the same assembly process. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range ensures equivalent environmental robustness. |
| Packaging | Tube | Tape & Reel | Different packaging affects assembly line feeding and order quantities, though the die is the same. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74HC540D | 74HC540D,652 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74HC | 74HC |
| Part Status | Active | Active |
| Logic Type | Buffer, 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
Are the 74HC540D and 74HC540D,652 the same device?
Yes. Both part numbers refer to the same Nexperia 74HC540D octal inverting buffer/line driver with 3-state outputs. The 74HC540D is the base type designation, while 74HC540D,652 is the full ordering code that includes the packing/ordering suffix used by Nexperia. The electrical function, package, and die are identical.
What is the difference between the 74HC540D and 74HC540D,652 ordering codes?
The suffix ",652" is a Nexperia ordering code that specifies the packing method and shipping format. The 74HC540D,652 is supplied in tape-and-reel packaging, whereas the bare 74HC540D designation is the generic type number. Both use the same SO16 (SOT109-1) plastic small outline package.
What are the key electrical specifications of the 74HC540D?
The 74HC540D is a high-speed Si-gate CMOS octal inverting buffer/line driver. It operates over a supply voltage range of 2.0 V to 6.0 V, has 3-state outputs, and provides inverting functionality. It is pin-compatible with the 74LS540 and features high noise immunity and low power consumption typical of HC-family CMOS devices.
Can the 74HC540D and 74HC540D,652 be used interchangeably in a design?
Yes. Since both ordering codes refer to the same physical device in the same SO16 package, they are functionally and electrically interchangeable. The only difference is the packaging format in which they are shipped, which does not affect PCB assembly or circuit performance.
What package does the 74HC540D use?
The 74HC540D is housed in a 16-pin SO (Small Outline) package, designated SOT109-1 by Nexperia. This is a surface-mount plastic package with a 1.27 mm pin pitch, suitable for standard SO16 PCB footprints.
What is the function of the 74HC540D's 3-state outputs?
The 3-state outputs allow each output to be placed in a high-impedance state via the two active-low output enable pins (OE1 and OE2). This enables the device to be connected to a shared bus without loading it when disabled, which is useful in bus-oriented and multiplexed systems.
Does the 74HC540D have inverting or non-inverting outputs?
The 74HC540D has inverting outputs. Each of the eight outputs provides the logical complement of its corresponding input when the output is enabled. This distinguishes it from the 74HC541, which has non-inverting outputs.