Part A
74LVC04AD
NXP USA Inc.
- Lifecycle
- Active
- Stock
- 7520 PCS
- Package
- SOIC-14
- Series
- Logique - portes et Onduleurs
Replacement verdict
Not a drop-in replacement
The 74LVC04AD and 74LVC4245AD,112 are not functionally interchangeable. The 74LVC04AD is a hex inverting gate, while the 74LVC4245AD,112 is an octal dual-supply bus transceiver with 3-state outputs and voltage translation. They differ in logic function, channel count, supply architecture, and pinout, so direct substitution is not possible without a complete circuit redesign.
Different logic function
Different channel count
Different supply architecture
Different pinout
Parts at a glance
Part B
74LVC4245AD,112
Nexperia USA Inc.
- Lifecycle
- Active
- Stock
- 8966 PCS
- Package
- SOIC-24
- Series
- Logique - traducteur, convertisseur de niveau
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 | 74LVC4245AD,112 | Why it matters |
|---|---|---|---|
| Logic Function | Hex inverter (6 independent inverters) | Octal dual-supply translating transceiver (8-bit bus) | The core function differs fundamentally: one inverts single-ended signals, the other provides bidirectional level translation across two supply rails, so they are not functionally interchangeable. |
| Number of Channels / Bits | 6 | 8 | Channel count determines how many signal lines can be handled per package, affecting board layout and device count. |
| Directionality | Unidirectional | Bidirectional (with direction control) | Bidirectional capability with a DIR pin allows the transceiver to drive data both ways, which a fixed unidirectional inverter cannot do. |
| Supply Voltage Range (VCC) | 1.65 V to 3.6 V | 1.5 V to 3.6 V (A port) and 2.7 V to 5.5 V (B port) | The dual-supply transceiver supports mixed-voltage systems (e.g., 3.3 V to 5 V translation), while the inverter operates on a single low-voltage rail. |
| Level Translation Capability | No (single supply only) | Yes (dual supply, A and B ports) | Level translation is essential when interfacing logic domains of different voltages; the inverter cannot perform this function. |
| Output Drive Current (IOH/IOL) | ±24 mA at 3.0 V | ±24 mA | Drive strength affects fan-out and the ability to drive capacitive or low-impedance loads; both are similar here but the transceiver's drive applies per bus line. |
| Propagation Delay (tpd) | Approximately 4.5 ns at 3.3 V | Approximately 5.5 ns at 3.3 V | Propagation delay influences maximum operating frequency and timing margins in synchronous designs. |
| Package Type | SO-14 (SOIC-14) | SO-24 (SOIC-24) | Different pin counts and footprints mean the two parts are not drop-in replacements on an existing PCB. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both meet industrial temperature requirements, so thermal range is not a differentiator for substitutability. |
| Control Inputs | None (pure inverter) | Output Enable (OE) and Direction (DIR) | The transceiver's OE and DIR pins enable bus isolation and direction control, features absent in the simple inverter. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LVC04AD | 74LVC4245AD,112 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Nexperia USA Inc. |
| Series | 74LVC | 74LVC |
| Part Status | Active | Obsolete |
| Translator Type | - | Voltage Level |
| Channel Type | - | Bidirectional |
| Number of Circuits | 6 | 1 |
| Channelsper Circuit | - | 8 |
| Voltage - VCCA | - | 1.5 V ~ 5.5 V |
| Voltage - VCCB | - | 1.5 V ~ 3.6 V |
| Output Type | - | Tri-State, Non-Inverted |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Logic Type | Inverter | - |
| Number of Inputs | 1 | - |
| Voltage - Supply | 1.65V ~ 3.6V | - |
| Current - Quiescent (Max) | 40 µA | - |
| Current - Output High Low | 24mA, 24mA | - |
| 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 74LVC4245AD,112?
The 74LVC04AD is a hex inverting buffer (six independent inverters) with a single supply voltage range of 1.65 V to 5.5 V. The 74LVC4245AD,112 is an octal dual-supply transceiver with 3-state outputs, designed for bidirectional level translation between a 3.3 V port and a 5 V port. They are not functionally equivalent and cannot be used interchangeably.
Can the 74LVC04AD and 74LVC4245AD,112 be used for level shifting?
The 74LVC04AD is not a dedicated level translator; it operates from a single supply and its inputs are not 5 V tolerant when powered at low voltages. The 74LVC4245AD,112 is specifically designed for level translation with dual supplies (VCCA and VCCB), allowing bidirectional signal transfer between 3.3 V and 5 V logic domains.
What are the supply voltage requirements for each device?
The 74LVC04AD operates from a single supply (VCC) of 1.65 V to 5.5 V. The 74LVC4245AD,112 requires two supplies: VCCA (typically 3.3 V) and VCCB (typically 5 V), with specified operating ranges per the manufacturer datasheet. The dual-supply design of the 74LVC4245AD,112 enables voltage domain isolation.
Do both devices have 3-state outputs?
No. The 74LVC04AD has standard push-pull outputs without a high-impedance state. The 74LVC4245AD,112 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 or isolation.
What are the package and pin count differences between the two parts?
The 74LVC04AD is typically offered in a 14-pin SOIC package (the "D" suffix indicates SOIC). The 74LVC4245AD,112 is typically offered in a 24-pin SOIC package (the "D" suffix and "112" ordering code indicate SOIC). Pin counts and pin functions differ, so PCB footprints are not compatible.
Can the 74LVC04AD drive inputs of the 74LVC4245AD,112 directly?
Yes, provided both devices are powered from compatible supply voltages and the output voltage levels of the 74LVC04AD meet the input threshold requirements of the 74LVC4245AD,112 on the corresponding port. The 74LVC4245AD,112 has separate input thresholds for its A and B ports, so the driving supply must match the port being driven.
Are the 74LVC04AD and 74LVC4245AD,112 interchangeable in existing designs?
No. They differ in function (inverter vs. transceiver), pin count, package size, supply configuration, and output type. Direct substitution is not possible without redesigning the circuit and PCB layout.
What is the typical application for each device?
The 74LVC04AD is used for signal inversion, clock generation, and general-purpose logic buffering in single-supply systems. The 74LVC4245AD,112 is used for bidirectional level translation between 3.3 V and 5 V buses, such as in mixed-voltage systems, memory interfaces, and peripheral buses requiring 3-state control.