Part A
74LVC04AD
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 7520 PCS
- Package
- SOIC-14
- Series
- Logic - Gates and Inverters
Replacement verdict
Not a drop-in replacement
The 74LVC04AD and 74LVC245AMTR are not functionally interchangeable. The 74LVC04AD is a hex inverting gate, while the 74LVC245AMTR is an octal bus transceiver with 3-state outputs. They differ in logic function, channel count, pinout, and I/O directionality, so direct substitution is not possible without a complete circuit redesign.
Different logic function
Different channel count
Different pinout
Different I/O directionality
Parts at a glance
Part B
74LVC245AMTR
STMicroelectronics
- Lifecycle
- Active
- Stock
- 8927 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 | 74LVC04AD | 74LVC245AMTR | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Octal Bus Transceiver | Defines the core function; these devices are not functionally interchangeable as they perform entirely different logic operations. |
| Number of Channels | 6 | 8 | Channel count determines how many independent signal lines can be processed simultaneously. |
| Direction Control | Unidirectional | Bidirectional (DIR pin) | Bidirectional capability with direction control allows the transceiver to route signals both ways, which the inverter cannot do. |
| Output Enable | No | Yes (active-low OE) | Output enable allows the device to be placed in high-impedance state for bus sharing, a feature absent in the inverter. |
| Supply Voltage Range | 1.65 V to 3.6 V | 1.65 V to 3.6 V | Both operate over the same LVC voltage range, ensuring compatibility with 1.8 V, 2.5 V, and 3.3 V logic systems. |
| Logic Family | LVC | LVC | Same logic family ensures comparable switching thresholds, drive strength, and noise margin characteristics. |
| Propagation Delay (typ) | 4.0 ns at 3.3 V | 5.3 ns at 3.3 V | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Output Drive Current | ±24 mA | ±24 mA | Drive current determines the ability to drive capacitive loads and fan-out to other logic inputs. |
| Package | SOIC-14 | SOIC-20 | Different pin counts and package sizes affect PCB layout, footprint, and board space requirements. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | Temperature range affects suitability for automotive, industrial, or commercial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVC04AD | 74LVC245AMTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | 74LVC | 74LVC |
| Part Status | Active | Obsolete |
| Logic Type | Inverter | Transceiver, Non-Inverting |
| Number of Elements | - | 1 |
| Number of Bits per Element | - | 8 |
| Output Type | - | 3-State |
| Current - Output High Low | 24mA, 24mA | 24mA, 24mA |
| Voltage - Supply | 1.65V ~ 3.6V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Circuits | 6 | - |
| Number of Inputs | 1 | - |
| Current - Quiescent (Max) | 40 µA | - |
| Logic Level - Low | 0.12V ~ 0.8V | - |
| Logic Level - High | 1.08V ~ 2V | - |
| Max Propagation Delay @ V Max CL | 6ns @ 3.3V, 50pF | - |
Frequently asked questions
What are the primary functional differences between the 74LVC04AD and the 74LVC245AMTR?
The 74LVC04AD is a hex inverting buffer (six independent inverters) with a single input and output per channel, while the 74LVC245AMTR is an octal bus transceiver with non-inverting 3-state outputs, designed for bidirectional data transfer between two buses. The 74LVC04AD provides logic inversion, whereas the 74LVC245AMTR provides non-inverting bidirectional level shifting and bus isolation.
Can the 74LVC04AD and 74LVC245AMTR be used interchangeably in a design?
No. They have different logic functions, pin counts, and pinouts. The 74LVC04AD is a 14-pin device with six inverters, while the 74LVC245AMTR is a 20-pin device with eight transceivers and direction/ output-enable controls. Direct substitution is not possible without redesigning the circuit and PCB layout.
What are the operating voltage ranges for the 74LVC04AD and 74LVC245AMTR?
Both devices are members of the LVC 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. They are not 5 V tolerant on the supply, but inputs may be 5 V tolerant depending on the specific manufacturer datasheet; always verify the exact device datasheet for input voltage tolerance.
What are the output drive capabilities of the 74LVC04AD and 74LVC245AMTR?
Both devices typically provide ±24 mA output drive at 3.3 V VCC, which is suitable for driving moderate loads and bus lines. The 74LVC245AMTR is specifically designed for bus-oriented applications with 3-state outputs, while the 74LVC04AD provides standard push-pull outputs without 3-state capability.
Does the 74LVC245AMTR have 3-state outputs, and does the 74LVC04AD?
Yes, the 74LVC245AMTR features 3-state outputs controlled by an output-enable (OE) pin, allowing the outputs to be placed in a high-impedance state for bus sharing. The 74LVC04AD does not have 3-state outputs; its outputs are always active push-pull.
What are the package types for the 74LVC04AD and 74LVC245AMTR?
The 74LVC04AD is commonly available in a 14-pin SOIC package (the "D" suffix typically denotes SOIC). The 74LVC245AMTR is typically offered in a 20-pin SOIC or TSSOP package (the "MTR" suffix often indicates tape and reel, with the base package being SOIC or TSSOP). Always confirm the exact package code from the manufacturer datasheet.
Are the 74LVC04AD and 74LVC245AMTR compatible with 5 V logic inputs?
Both devices are not 5 V tolerant on their supply pins, but their inputs may be 5 V tolerant when VCC is within the recommended operating range, depending on the specific manufacturer. For the 74LVC04AD, input voltage tolerance is typically up to 5.5 V independent of VCC for some manufacturers, while the 74LVC245AMTR I/O pins may also be 5 V tolerant in certain configurations. Verify the exact datasheet for the specific part number.
What is the difference in propagation delay between the 74LVC04AD and 74LVC245AMTR?
Both devices have similar propagation delays typical of the LVC family, generally in the range of 1 ns to 5 ns depending on VCC and load conditions. The 74LVC04AD inverter typically has a propagation delay of about 3.5 ns at 3.3 V, while the 74LVC245AMTR transceiver has a propagation delay of about 3.0 ns at 3.3 V. Exact values vary by manufacturer and must be verified from the respective datasheets.
Which device is better for bidirectional bus applications?
The 74LVC245AMTR is specifically designed for bidirectional bus applications due to its octal transceiver configuration, direction control (DIR), and 3-state outputs. The 74LVC04AD is a unidirectional inverter and is not suitable for bidirectional bus interfacing without additional external logic.