Part A
74VHC541FT
도시바 반도체 및 스토리지
- Lifecycle
- Active
- Stock
- 5516 PCS
- Package
- TSSOP-20
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Replacement verdict
Compatible functional replacement candidate
The 74VHC541FT and 74VHC240MTR are both octal buffers from the VHC family, but they are not pin-compatible drop-in replacements. The 74VHC541FT provides non-inverting 3-state outputs in a TSSOP-20 package, while the 74VHC240MTR provides inverting 3-state outputs in a SOIC-20 package. Designers must account for the inverted logic and different footprint before substituting one for the other.
Output Type
Validation required
Package Type
Validation required
Logic Family
High match
Supply Voltage
High match
Parts at a glance
Part B
74VHC240MTR
ST마이크로일렉트로닉스(주)
- Lifecycle
- Active
- Stock
- 8032 PCS
- Package
- SOIC-20
- Series
- 논리 - 버퍼, 드라이브, 수신기, 트랜시버
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC541FT | 74VHC240MTR | 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 74VHC541 is non-inverting while the 74VHC240 is inverting, so they are not functionally interchangeable in circuits where signal polarity is critical. |
| Output Enable Control | Two active-low OE pins (OE1, OE2) | Two active-low OE pins (OE1, OE2), one per nibble | Both devices use active-low enables, but the 74VHC240 splits control per 4-bit group while the 74VHC541 controls all 8 bits together, affecting bus control granularity. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Identical operating voltage range allows both parts to work in the same 2 V to 5.5 V logic systems. |
| Output Drive Current | ±8 mA | ±8 mA | Matching drive strength means either device can drive the same load without additional buffering. |
| Propagation Delay | Approximately 5.5 ns at 5 V | Approximately 5.5 ns at 5 V | Similar propagation delay ensures comparable timing performance in high-speed digital designs. |
| Package Type | TSSOP-20 | SOIC-20 | Different package footprints affect PCB layout and may require board redesign when substituting one for the other. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings make both suitable for the same industrial and commercial environments. |
| Input Type | CMOS | CMOS | CMOS inputs provide high impedance and low static power consumption in both devices. |
| Number of Channels | 8 | 8 | Both provide eight buffer channels, matching the channel count required for octal bus applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC541FT | 74VHC240MTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Buffer, Non-Inverting | Buffer, Inverting |
| Number of Elements | 1 | 2 |
| Number of Bits per Element | 8 | 4 |
| Output Type | 3-State | 3-State |
| Current - Output High Low | 8mA, 8mA | 8mA, 8mA |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) | -55°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the 74VHC541FT and the 74VHC240MTR?
The 74VHC541FT is an octal non-inverting buffer/line driver with 3-state outputs, while the 74VHC240MTR is an octal inverting buffer/line driver with 3-state outputs. The key difference is logic polarity: the 541 passes signals non-inverted, and the 240 inverts them.
Do the 74VHC541FT and 74VHC240MTR have the same pinout and package type?
No. The 74VHC541FT is typically supplied in a TSSOP20 package, and the 74VHC240MTR is typically supplied in an SOIC-20 package. Pin assignments also differ because the 541 has all inputs on one side and outputs on the other, while the 240 has inputs and outputs arranged in opposing pairs for each channel.
Can the 74VHC541FT and 74VHC240MTR be used interchangeably in a design?
No, they are not direct substitutes. The 74VHC240MTR inverts the signal, whereas the 74VHC541FT does not. In addition, their pinouts and package footprints differ, so a PCB redesign or layout change would be required.
What are the operating voltage and logic family specifications for both devices?
Both are members of the 74VHC family and operate over a supply voltage range of 2.0 V to 5.5 V. They are CMOS devices with TTL-compatible inputs, and they provide balanced propagation delays and output drive characteristics typical of the VHC series.
What is the output drive capability of the 74VHC541FT and 74VHC240MTR?
Both devices provide standard VHC output drive, typically ±8 mA at 5.0 V VCC. This makes them suitable for driving moderate capacitive loads and bus lines in 3-state applications.
How do the 3-state control pins differ between the 74VHC541FT and the 74VHC240MTR?
The 74VHC541FT has two active-low output enable pins (OE1 and OE2) that control the eight outputs in two groups of four. The 74VHC240MTR also has two active-low output enable pins, but each controls four inverting channels. In both cases, a high logic level on an enable pin places the corresponding outputs in a high-impedance state.
Which device is better for bus driving applications, the 74VHC541FT or the 74VHC240MTR?
Both are suitable for bus driving, but the choice depends on signal polarity requirements. The 74VHC541FT is used when non-inverted buffering is needed, while the 74VHC240MTR is used when signal inversion is required. Both offer 3-state outputs for bus isolation.
Are the 74VHC541FT and 74VHC240MTR available in the same temperature grade?
Both devices are typically specified for the industrial temperature range of -40°C to +85°C, although the exact grade should be confirmed from the specific manufacturer datasheet for each part number.