Part A
74LCX04MTCX
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- TSSOP-14
- Series
- Logique - portes et Onduleurs
Replacement verdict
Compatible functional replacement candidate
The 74LCX04MTCX and 74LCX06MTCX share the same TSSOP-14 package, 2.0 V to 3.6 V supply range, and hex inverter topology, making them mechanically and electrically similar. However, the 74LCX04MTCX provides standard CMOS push-pull outputs, while the 74LCX06MTCX features open-drain outputs requiring external pull-up resistors. This output structure difference is the primary factor determining substitutability, and direct replacement is only viable when the open-drain configuration is acceptable or when the circuit is redesigned accordingly.
Output Type
High match
Package Type
High match
Supply Voltage Range
High match
Output Drive Configuration
Validation required
Parts at a glance
Part B
74LCX06MTCX
Fairchild Semiconductor Inc
- Lifecycle
- Active
- Stock
- 8775 PCS
- Series
- Logique - portes et Onduleurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74LCX04MTCX | 74LCX06MTCX | Why it matters |
|---|---|---|---|
| Logic Function | Hex Inverter | Hex Inverter with Open-Drain Outputs | Determines the output drive type; the 06 has open-drain outputs requiring external pull-up resistors, while the 04 has standard push-pull outputs. |
| Output Type | Push-Pull (Totem Pole) | Open-Drain | Push-pull outputs can source and sink current, whereas open-drain outputs can only sink current and need a pull-up resistor to achieve a logic high. |
| Output Drive Current (IOL/IOH) | ±24 mA | 24 mA (sink only) | Affects fan-out and the ability to drive loads; the 04 can both source and sink 24 mA, while the 06 only sinks 24 mA. |
| Propagation Delay (tPD) | 5.2 ns (typical at 3.3 V) | 5.5 ns (typical at 3.3 V) | Influences maximum operating frequency and timing margins in synchronous systems. |
| Output Rise/Fall Time | Defined by internal push-pull stage | Depends on external pull-up resistor and load capacitance | Open-drain outputs have slower rise times determined by the RC time constant, which can affect signal integrity and power consumption. |
| Wired-OR / Wired-AND Capability | Not possible | Possible (wired-OR) | Open-drain outputs can be tied together to implement wired-OR logic, a common requirement in bus and interrupt applications. |
| External Pull-up Resistor Requirement | Not required | Required for logic high | Affects board design complexity, component count, and power dissipation; the 06 needs additional resistors. |
| Power Consumption (Static) | Lower (no pull-up current when output high) | Higher (pull-up current when output low) | Open-drain outputs draw static current through the pull-up resistor when the output is low, increasing power consumption. |
| Typical Application | General-purpose inversion, clock buffering | Bus interfacing, wired-OR, level shifting | The output structure dictates suitability for specific circuit topologies; the 06 is preferred for shared buses and mixed-voltage interfaces. |
| Package | TSSOP-14 | TSSOP-14 | Identical package allows drop-in replacement in terms of footprint, but electrical differences must be considered. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74LCX04MTCX | 74LCX06MTCX |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | 74LCX | 74LCX |
| Part Status | Active | Active |
| Logic Type | Inverter | Inverter |
| Number of Circuits | 6 | 6 |
| Number of Inputs | 1 | 1 |
| Features | - | Open Drain |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V |
| Current - Quiescent (Max) | 10 µA | 10 µA |
| Current - Output High Low | 24mA, 24mA | -, 24mA |
| Logic Level - Low | 0.7V ~ 0.8V | 0.7V ~ 0.8V |
| Logic Level - High | 1.7V ~ 2V | 1.7V ~ 2V |
| Max Propagation Delay @ V Max CL | 5.2ns @ 3.3V, 50pF | 3.7ns @ 3.3V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 74LCX04MTCX and 74LCX06MTCX?
The 74LCX04MTCX is a hex inverter with standard push-pull CMOS outputs, while the 74LCX06MTCX is a hex inverter with open-drain outputs. Both are low-voltage CMOS logic devices in the 74LCX family and are supplied in the TSSOP-14 package (MTC suffix).
What is the key functional difference between the 74LCX04MTCX and 74LCX06MTCX?
The 74LCX04MTCX has standard push-pull outputs that actively drive both HIGH and LOW levels. The 74LCX06MTCX has open-drain outputs that can only pull LOW; a HIGH level must be provided by an external pull-up resistor or another driving source.
Are the 74LCX04MTCX and 74LCX06MTCX pin-compatible?
Yes. Both devices use the same TSSOP-14 package and the same pinout: pins 1, 3, 5, 9, 11, and 13 are inputs; pins 2, 4, 6, 8, 10, and 12 are outputs; pin 7 is GND; and pin 14 is VCC. This allows the 74LCX06MTCX to be used in a board designed for the 74LCX04MTCX when open-drain behavior is required, provided external pull-up resistors are added.
What are the recommended operating conditions for the 74LCX04MTCX and 74LCX06MTCX?
Both devices are specified for a supply voltage (VCC) range of 2.0 V to 3.6 V, with 2.5 V and 3.3 V as common nominal rails. They are characterized for operation over the -40 °C to +85 °C industrial temperature range.
Can the 74LCX06MTCX be used to drive a shared bus or wired-OR configuration?
Yes. Because the 74LCX06MTCX has open-drain outputs, multiple outputs can be tied together with a single pull-up resistor to implement a wired-OR or wired-AND function. The 74LCX04MTCX cannot be used this way because its push-pull outputs would contend if tied together.
What is the difference in output drive capability between the 74LCX04MTCX and 74LCX06MTCX?
The 74LCX04MTCX provides balanced push-pull drive, typically specified as ±24 mA at VCC = 3.0 V. The 74LCX06MTCX open-drain output is specified to sink 24 mA at VOL = 0.55 V (max) at VCC = 3.0 V; the HIGH level is determined by the external pull-up and is not actively driven by the device.
Are the 74LCX04MTCX and 74LCX06MTCX input structures the same?
Yes. Both devices use standard CMOS input structures compatible with 3.3 V logic and are tolerant of input voltages up to 5.5 V, allowing them to interface with 5 V logic systems when VCC is within the 2.0 V to 3.6 V range.
When should the 74LCX06MTCX be selected instead of the 74LCX04MTCX?
The 74LCX06MTCX should be selected when open-drain outputs are required, such as for level shifting, wired-OR bus arbitration, driving LEDs with a pull-up, or interfacing to a bus that may be driven by multiple sources. The 74LCX04MTCX is preferred when standard push-pull inversion with active HIGH and LOW drive is needed.