Part A
74VHC595MX
Fairchild Semiconductor Inc
- Lifecycle
- Active
- Stock
- 3740 PCS
- Package
- SOIC-16
- Series
- Logique - Registre à décalage
Replacement verdict
Not a drop-in replacement
The 74VHC595MX and 74VHC00M 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 3-state outputs, while the 74VHC00M is a quad 2-input NAND gate. Their internal logic functions, pin assignments, and signal flow are fundamentally different, so substituting one for the other is not possible in any existing design.
Different logic function
Different pinout
Different output type
Different input configuration
Parts at a glance
Part B
74VHC00M
Semi - conducteurs
- Lifecycle
- Active
- Stock
- 20 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 | 74VHC595MX | 74VHC00M | Why it matters |
|---|---|---|---|
| Logic Function | 8-Bit Serial-In/Serial-Out or Parallel-Out Shift Register with Output Latches | Quad 2-Input NAND Gate | The core logic function determines whether the devices are functionally interchangeable; these two parts perform entirely different operations and cannot substitute for one another. |
| Number of Pins | 16 | 14 | Pin count affects PCB footprint and package compatibility; a mismatch prevents direct drop-in replacement. |
| Package Type | SOIC-16 | SOIC-14 | Different package outlines require different land patterns, so they are not mechanically interchangeable on the same footprint. |
| Number of Outputs | 8 (parallel) plus serial output | 4 | Output count reflects the device's drive capability and functional role in a circuit. |
| Output Type | Tri-State | Push-Pull | Tri-state outputs allow bus sharing and high-impedance states, while push-pull outputs always drive high or low; this affects bus interfacing and wiring topology. |
| Propagation Delay (typ) | Approximately 6 ns at 5 V | Approximately 3.5 ns at 5 V | Propagation delay influences maximum operating frequency and timing margins in synchronous designs. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support the same VHC voltage range, allowing operation in 3.3 V and 5 V systems. |
| Logic Family | VHC (Very High-Speed CMOS) | VHC (Very High-Speed CMOS) | Same logic family ensures compatible input/output thresholds and noise margins when interfacing with other VHC devices. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges confirm both parts are suitable for the same industrial-grade environments. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so they suit the same assembly processes, though footprints still differ. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC595MX | 74VHC00M |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Shift Register | NAND Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| 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 74VHC00M?
The 74VHC595MX is an 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register and 3-state output registers, while the 74VHC00M is a quad 2-input NAND gate. They perform fundamentally different logic functions and are not interchangeable.
Do the 74VHC595MX and 74VHC00M share the same package type and pin count?
Both devices are commonly offered in an SOIC-16 package, but their pinouts and internal functions differ. The 74VHC595MX uses 16 pins for serial data input, shift clock, storage clock, output enable, serial output, and eight parallel outputs, whereas the 74VHC00M uses 14 pins for four independent 2-input NAND gates plus power and ground.
Can the 74VHC595MX be used as a direct drop-in replacement for the 74VHC00M?
No. The 74VHC595MX is a shift register with sequential logic and registered outputs, while the 74VHC00M is a combinational quad NAND gate. Their logic functions, pin assignments, and input/output characteristics are different, so direct substitution is not possible without redesigning the circuit.
What are the typical operating voltage and logic family specifications for both devices?
Both the 74VHC595MX and 74VHC00M belong to the VHC (Very High Speed CMOS) logic family and typically operate over a supply voltage range of 2.0 V to 5.5 V, with balanced propagation delays and CMOS-compatible input thresholds. Exact limits should be confirmed from the respective manufacturer datasheets.
Which device is better suited for serial-to-parallel data conversion?
The 74VHC595MX is specifically designed for serial-to-parallel data conversion, featuring an 8-bit shift register, an 8-bit storage register, and 3-state parallel outputs. The 74VHC00M cannot perform serial-to-parallel conversion because it contains only combinational NAND gates.
Are the output drive capabilities of the 74VHC595MX and 74VHC00M the same?
Both VHC-family devices typically provide symmetrical CMOS output drive, but the 74VHC595MX includes 3-state parallel outputs intended for bus-oriented applications, while the 74VHC00M provides standard push-pull gate outputs. Actual source/sink current ratings should be verified from the manufacturer datasheets.
Can both devices operate in the same temperature range?
Both the 74VHC595MX and 74VHC00M are typically specified for industrial operating temperature ranges, commonly -40 °C to +85 °C or -40 °C to +125 °C depending on the manufacturer and grade. The exact temperature range must be confirmed from the ordered part number's datasheet.
What are the typical applications for each device?
The 74VHC595MX is commonly used for LED displays, relay drivers, GPIO expansion, and serial-to-parallel data transfer. The 74VHC00M is used for general-purpose logic gating, signal inversion, oscillator circuits, and combinational logic functions in digital systems.