Part A
74LVC2G125DP
Nexperia Hoa Kỳ Inc.
- Lifecycle
- Active
- Stock
- 4957 PCS
- Package
- TSSOP-8
- Series
- Logic - Buffers, Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The 74LVC2G125DP and 74LVC245ATTR are not functionally interchangeable. The 74LVC2G125DP is a dual single-bit buffer with individual 3-state enables and a compact TSSOP-8 footprint, while the 74LVC245ATTR is an octal bus transceiver with direction control and a 20-pin TSSOP package. Differences in channel count, control architecture, pinout, and package size prevent direct substitution without board-level redesign.
Different channel count
Different control architecture
Different pinout
Different package footprint
Parts at a glance
Part B
74LVC245ATTR
STMicroelectronics
- Lifecycle
- Active
- Stock
- 9223 PCS
- Package
- TSSOP-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 | 74LVC2G125DP | 74LVC245ATTR | Why it matters |
|---|---|---|---|
| Logic Function | Dual Buffer/Line Driver with 3-State Outputs | Octal Bus Transceiver with 3-State Outputs | Determines the fundamental signal-routing capability; a dual buffer handles two channels while an octal transceiver handles eight bidirectional channels. |
| Number of Channels | 2 | 8 | Channel count directly affects how many signal lines can be buffered or driven, impacting suitability for bus-width applications. |
| Direction Control | Unidirectional (with output enable) | Bidirectional (DIR pin selects A-to-B or B-to-A) | Bidirectional capability allows the device to interface between two buses, whereas unidirectional buffers only pass signals one way. |
| Output Enable Control | Individual OE per channel (active-low) | Single OE for all channels (active-low) | Independent enables allow selective channel activation, while a shared enable simplifies control but reduces flexibility. |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 3.6 V | Wider supply range offers greater compatibility with mixed-voltage systems and 5 V tolerant interfaces. |
| Package Type | TSSOP-8 | TSSOP-20 | Package footprint and pin count affect PCB layout, board space, and assembly compatibility. |
| Maximum Operating Frequency | Up to 100 MHz (typical at 3.3 V) | Up to 100 MHz (typical at 3.3 V) | Frequency capability determines suitability for high-speed data paths and timing-critical applications. |
| Propagation Delay | ~4.5 ns at 3.3 V | ~5.5 ns at 3.3 V | Lower propagation delay improves signal integrity and timing margins in synchronous systems. |
| Output Drive Current | ±24 mA at 3.0 V | ±24 mA at 3.0 V | Drive strength determines the ability to drive capacitive loads and fan-out to multiple inputs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Wider temperature range supports use in harsh environments and automotive or industrial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVC2G125DP | 74LVC245ATTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | - | 74LVC |
| Part Status | Active | Obsolete |
| Logic Type | - | Transceiver, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Output Type | - | 3-State |
| Current - Output High Low | - | 24mA, 24mA |
| Voltage - Supply | - | 1.65V ~ 3.6V |
| Operating Temperature | - | -55°C ~ 125°C (TA) |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the main functional differences between the 74LVC2G125DP and the 74LVC245ATTR?
The 74LVC2G125DP is a dual single-bit buffer/line driver with 3-state outputs, while the 74LVC245ATTR is an octal bus transceiver with 3-state outputs. The 74LVC2G125DP provides two independent non-inverting buffers with individual output enable pins, whereas the 74LVC245ATTR provides eight bidirectional transceiver channels with direction control and a single output enable for all channels.
What are the package differences between the 74LVC2G125DP and the 74LVC245ATTR?
The 74LVC2G125DP is supplied in a TSSOP-8 package (DP suffix), while the 74LVC245ATTR is supplied in a TSSOP-20 package (ATTR suffix). The 74LVC2G125DP has 8 pins, and the 74LVC245ATTR has 20 pins, so they are not footprint-compatible.
Can the 74LVC2G125DP and 74LVC245ATTR operate at the same supply voltage range?
Yes. Both devices are part of the 74LVC family and operate over a supply voltage range of 1.65 V to 3.6 V, with typical operation at 1.8 V, 2.5 V, and 3.3 V rails.
Are the 74LVC2G125DP and 74LVC245ATTR interchangeable in a design?
No. They differ in channel count, pin count, package size, and control architecture. The 74LVC2G125DP offers two independently enabled buffers, while the 74LVC245ATTR offers eight bidirectional channels with a direction pin and a single output enable. A direct drop-in replacement is not possible without redesigning the PCB and control logic.
What is the direction control behavior of the 74LVC245ATTR compared to the 74LVC2G125DP?
The 74LVC245ATTR includes a direction control (DIR) pin that selects whether data flows from the A bus to the B bus or from the B bus to the A bus. The 74LVC2G125DP does not have a direction pin; each of its two buffers is unidirectional and is controlled only by its respective output enable (OE) pin.
What output drive current can the 74LVC2G125DP and 74LVC245ATTR sink and source?
Both devices are specified with a typical output drive of ±24 mA at 3.0 V supply voltage, which is a standard characteristic of the 74LVC family for balanced bus driving and line driving applications.
Which device is better suited for bus-oriented applications?
The 74LVC245ATTR is better suited for bus-oriented applications because it provides eight bidirectional transceiver channels with direction control and a single output enable, allowing it to interface two buses directly. The 74LVC2G125DP is intended for dual independent buffer or line driver functions rather than multi-bit bus transceiving.
Do both the 74LVC2G125DP and 74LVC245ATTR have 3-state outputs?
Yes. Both devices feature 3-state outputs. On the 74LVC2G125DP, each buffer output can be placed in a high-impedance state via its individual OE pin. On the 74LVC245ATTR, all eight transceiver outputs are placed in high-impedance state when the common OE pin is deasserted.