Part A
74VHC595MX
Công ty bán dẫn Fairchild
- Lifecycle
- Active
- Stock
- 3740 PCS
- Package
- SOIC-16
- Series
- Logic - Shift Registers
Replacement verdict
Not a drop-in replacement
The 74VHC595MX and 74VHC00SJ 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 74VHC00SJ is a quad 2-input NAND gate. Their logic functions, pin configurations, and I/O architectures are fundamentally different, making direct replacement impossible without complete circuit redesign.
Different logic function
Different output type
Different pin configuration
Different I/O architecture
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 | 74VHC00SJ | 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 completely different operations. |
| Number of Pins | 16 | 14 | Pin count affects PCB footprint and package compatibility; 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. |
| Output Type | 3-State | Push-Pull | Output configuration affects bus interfacing capability; 3-state outputs allow shared bus connections while push-pull does not. |
| Number of Outputs | 8 | 4 | The number of outputs determines how many signals can be driven, directly impacting circuit design capacity. |
| Number of Inputs | 3 (SER, SRCLK, RCLK) plus OE and SRCLR | 8 (two per gate) | Input count and configuration determine how the device interfaces with surrounding logic. |
| Propagation Delay (tpd) | Approximately 6.5 ns at 5 V | Approximately 4.3 ns at 5 V | Propagation delay affects 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 family voltage range, so supply compatibility is not a differentiator here. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so thermal compatibility is equivalent. |
| Logic Family | VHC (Very High-Speed CMOS) | VHC (Very High-Speed CMOS) | Same logic family means compatible input/output voltage thresholds and drive characteristics. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC595MX | 74VHC00SJ |
|---|---|---|
| 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 functions of the 74VHC595MX and 74VHC00SJ?
The 74VHC595MX is an 8-bit serial-in, parallel-out shift register with output latches and 3-state outputs, commonly used for I/O expansion. The 74VHC00SJ contains four independent 2-input NAND gates, used for basic logic operations.
Can the 74VHC595MX and 74VHC00SJ be used interchangeably in a design?
No. They perform entirely different logic functions. The 74VHC595MX is a shift register for serial-to-parallel data conversion, while the 74VHC00SJ is a quad 2-input NAND gate. They are not pin-compatible or functionally equivalent.
What are the operating voltage ranges for these devices?
Both the 74VHC595MX and 74VHC00SJ are part of the VHC family and typically operate over a supply voltage range of 2.0 V to 5.5 V, with characterized operation at 5.0 V ± 0.5 V for AC and DC specifications.
What package types are available for the 74VHC595MX and 74VHC00SJ?
The 74VHC595MX is commonly offered in a 16-pin SOIC package. The 74VHC00SJ is typically provided in a 14-pin SOP package. Package options may vary by manufacturer; always verify with the specific datasheet.
Do both devices have the same output drive capability?
Both devices in the VHC family typically provide ±8 mA output drive at 5.0 V, but this should be confirmed from the specific manufacturer datasheet as drive strength can vary slightly between logic functions and test conditions.
Are the 74VHC595MX and 74VHC00SJ compatible with 5 V TTL logic levels?
Yes. Both devices are designed with input thresholds compatible with 5 V TTL logic levels when operated at 5 V, allowing direct interfacing with TTL outputs in mixed-logic systems.
What is the maximum operating frequency for the 74VHC595MX shift register?
The 74VHC595MX typically supports a maximum shift frequency of around 100 MHz at 5 V, but the exact limit depends on supply voltage, load conditions, and manufacturer specifications. Consult the datasheet for derating information.
Do both devices feature Schmitt-trigger inputs?
No. Standard VHC-series devices, including the 74VHC595MX and 74VHC00SJ, do not have Schmitt-trigger inputs. Schmitt-trigger versions are typically identified by a different suffix or part number within the logic family.