Part A
74VHC595MX
フェアチャイルドセミコンダクター
- Lifecycle
- Active
- Stock
- 3740 個数
- Package
- SOIC-16
- Series
- ロジック - シフトレジスタ
Replacement verdict
Not a drop-in replacement
The 74VHC595MX and 74VHC04M are not functionally interchangeable despite sharing the same VHC logic family and SOIC-16 package. The 74VHC595MX is an 8-bit serial-in/parallel-out shift register with output latches and tri-state outputs, while the 74VHC04M is a hex inverter providing six independent NOT gates. Their internal architectures, pin functions, and logic operations are fundamentally different, making direct substitution impossible without complete circuit redesign.
Different logic function
Different pinout
Different output type
Different channel count
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC595MX | 74VHC04M | Why it matters |
|---|---|---|---|
| Logic Function | 8-Bit Serial-In/Serial-Out or Parallel-Out Shift Register with Output Latches | Hex Inverter | The core logic function determines whether the devices are functionally interchangeable; these two parts perform entirely different operations. |
| Number of Circuits / Bits | 8-bit shift register | 6 inverters | The number of channels or bits defines how many signals the device can process, directly affecting circuit design and pin usage. |
| Output Type | Tri-State (3-state) outputs | Standard push-pull (totem-pole) outputs | Tri-state outputs allow bus sharing and high-impedance states, while push-pull outputs cannot be tied together, affecting system architecture. |
| Package / Case | SOIC-16 (16-pin small outline) | SOIC-14 (14-pin small outline) | Different pin counts and package sizes mean the parts are not drop-in replacements on the same PCB footprint. |
| Number of Pins | 16 | 14 | Pin count must match the board layout; a mismatch prevents direct substitution without redesign. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both parts operate over the same VHC supply range, so voltage compatibility is not a differentiator. |
| Logic Family | VHC (Very High-Speed CMOS) | VHC (Very High-Speed CMOS) | Same logic family implies similar speed, drive strength, and input/output threshold characteristics. |
| Propagation Delay (typical) | ~6.5 ns at 5 V (shift clock to output) | ~5.5 ns at 5 V (input to output) | Propagation delay affects maximum operating frequency and timing margins in synchronous designs. |
| Output Drive Current | ±8 mA at 5 V | ±8 mA at 5 V | Drive current determines the ability to drive loads such as LEDs or other logic inputs; both are similar here. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range affects suitability for industrial or automotive environments; both share the same range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC595MX | 74VHC04M |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Shift Register | Inverter |
| Number of Circuits | - | 6 |
| Number of Inputs | - | 1 |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | - | 8mA, 8mA |
| Logic Level - Low | - | 0.5V |
| Logic Level - High | - | 1.5V |
| Max Propagation Delay @ V Max CL | - | 7.5ns @ 5V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Tri-State | - |
| Number of Elements | 1 | - |
| Number of Bits per Element | 8 | - |
| Function | Serial to Parallel, Serial | - |
Frequently asked questions
What are the primary functional differences between the 74VHC595MX and the 74VHC04M?
The 74VHC595MX is an 8-bit serial-in, parallel-out shift register with a tri-state output register, while the 74VHC04M is a hex inverter. The 74VHC595MX is used for serial-to-parallel data conversion and output latching, whereas the 74VHC04M provides six independent logic inverting buffers.
Can the 74VHC595MX and 74VHC04M be used interchangeably in a circuit design?
No. They have different logic functions, pinouts, and internal architectures. The 74VHC595MX cannot perform inversion, and the 74VHC04M cannot perform serial-to-parallel shifting or latching. Direct substitution is not possible without redesigning the circuit.
Do the 74VHC595MX and 74VHC04M operate at the same supply voltage range?
Yes. Both devices are part of the 74VHC family and typically operate over a supply voltage range of 2.0 V to 5.5 V, as specified in their respective manufacturer datasheets.
What are the package types for the 74VHC595MX and 74VHC04M?
The 74VHC595MX is commonly offered in a 16-pin SOIC package, while the 74VHC04M is commonly offered in a 14-pin SOIC package. Package dimensions and pin counts differ, so PCB land patterns are not compatible.
Are the 74VHC595MX and 74VHC04M pin-compatible?
No. The 74VHC595MX has 16 pins, and the 74VHC04M has 14 pins. Their pin functions and assignments are entirely different, so they cannot share the same PCB footprint or socket.
Which device is suitable for driving LEDs or parallel data buses?
The 74VHC595MX is suitable for driving parallel data buses or LED arrays because it provides eight registered parallel outputs with tri-state control. The 74VHC04M is a hex inverter and is typically used for signal inversion or buffering, not for parallel data storage or bus driving.
Do both devices have the same output drive capability?
Both are 74VHC-family CMOS devices and typically provide symmetrical output drive, commonly specified as ±8 mA at 5 V VCC in manufacturer datasheets. However, the 74VHC595MX outputs are registered and tri-state capable, while the 74VHC04M outputs are simple inverting buffers.
What are the typical applications for each device?
The 74VHC595MX is typically used for serial-to-parallel data conversion, LED matrix control, and output port expansion. The 74VHC04M is typically used for signal inversion, clock or logic buffering, and oscillator circuits.