Part A
74VHC595MX
Semiconductor Fairchild
- Lifecycle
- Active
- Stock
- 3740 PCS
- Package
- SOIC-16
- Series
- Lógica - Registos de Maiúsculas
Replacement verdict
Not a drop-in replacement
The 74VHC595MX and 74VHC08MTR are functionally unrelated devices and cannot serve as substitutes for one another. The 74VHC595MX is an 8-bit serial-in/parallel-out shift register with output latches and 3-state outputs, while the 74VHC08MTR is a quad 2-input AND gate. Their logic functions, pinouts, and I/O architectures are fundamentally different, so neither part can directly replace the other in an existing design.
Different logic function
Different output type
Different pinout
Different channel count
Parts at a glance
Part B
74VHC08MTR
STMicroeletrônica
- Lifecycle
- Active
- Stock
- 2495 PCS
- Series
- Lógica - Gates e Inverters
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 | 74VHC08MTR | Why it matters |
|---|---|---|---|
| Logic Function | 8-Bit Serial-In/Serial-Out or Parallel-Out Shift Register with Output Latches | Quad 2-Input AND Gate | The core logic function determines whether the devices are functionally interchangeable; these two parts perform entirely different logical operations. |
| Number of Pins | 16 | 14 | Pin count affects PCB footprint and package compatibility; devices with different pin counts cannot be dropped into the same socket. |
| Package Type | SOIC-16 | SOIC-14 | Package type and body width must match for physical board-level substitution. |
| Number of Outputs | 8 (parallel) plus serial output | 4 | Output count determines how many signals the device can drive, which is critical for circuit design and substitutability. |
| Output Type | Tri-State (parallel outputs) | Push-Pull (CMOS) | Output configuration affects bus sharing capability and drive characteristics; tri-state outputs allow connection to shared buses. |
| Propagation Delay (typ.) | ~6.5 ns at 5 V | ~5.5 ns at 5 V | Propagation delay impacts timing margins in synchronous systems; different delays may require timing re-analysis. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support the same VHC voltage range, so supply compatibility is not a differentiator here. |
| Maximum Operating Frequency | ~115 MHz at 5 V | ~100 MHz at 5 V | Maximum frequency determines the highest clock rate the device can reliably handle in high-speed applications. |
| Logic Family | VHC (Very High-Speed CMOS) | VHC (Very High-Speed CMOS) | Same logic family ensures compatible input/output voltage thresholds and noise margins. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both devices share the same industrial temperature range, so thermal compatibility is not a differentiator. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC595MX | 74VHC08MTR |
|---|---|---|
| Supplier | - | STMicroelectronics |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Shift Register | AND 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 | - | 7.9ns @ 5V, 50pF |
| Operating Temperature | -40°C ~ 85°C | -55°C ~ 125°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 functions of the 74VHC595MX and 74VHC08MTR?
The 74VHC595MX is an 8-bit serial-in, parallel-out shift register with output latches and 3-state outputs, used for expanding I/O. The 74VHC08MTR contains four independent 2-input AND gates, used for logic signal gating and combination.
Can the 74VHC595MX and 74VHC08MTR be used interchangeably?
No. They are functionally different devices. The 74VHC595MX is a shift register with serial-to-parallel conversion, while the 74VHC08MTR is a quad 2-input AND gate. They are not pin-compatible or functionally equivalent.
What are the operating voltage ranges for these devices?
Both the 74VHC595MX and 74VHC08MTR operate over a supply voltage range of 2.0 V to 5.5 V, typical of the VHC logic family.
What package types are available for the 74VHC595MX and 74VHC08MTR?
The 74VHC595MX is typically offered in a 16-pin SOIC package. The 74VHC08MTR is typically offered in a 14-pin SOIC package. Package options may vary by manufacturer; always verify the specific ordering code.
What are the output drive capabilities of these devices?
Both devices provide standard VHC-family output drive, typically ±8 mA at 5 V VCC. The 74VHC595MX has 3-state parallel outputs, while the 74VHC08MTR has standard push-pull outputs.
Are these devices compatible with 5 V TTL logic levels?
Yes. Both the 74VHC595MX and 74VHC08MTR have TTL-compatible input thresholds when operated at 5 V VCC, allowing direct interfacing with 5 V TTL logic.
What is the maximum operating frequency of the 74VHC595MX and 74VHC08MTR?
The 74VHC595MX shift register supports serial clock frequencies up to approximately 115 MHz at 5 V VCC. The 74VHC08MTR AND gate has propagation delays typically in the 4–6 ns range at 5 V VCC, supporting high-speed logic operations.
Do these devices have any special output configurations?
The 74VHC595MX features 3-state outputs that can be placed in high-impedance state, allowing bus sharing. The 74VHC08MTR has standard totem-pole outputs without 3-state capability.