Part A
74VHC595MX
Công ty bán dẫn Fairchild
- Lifecycle
- Active
- Stock
- 3740 PCS
- Package
- SOIC-16
- Series
- Logic - Shift Registers
Replacement verdict
Compatible functional replacement candidate
The 74VHC595MX and 74VHC595SJ are functionally equivalent 8-bit serial-in/parallel-out shift registers with output latches from the same VHC logic family, sharing identical logic function, supply voltage range, and drive characteristics. The primary distinction is package format, with the MX offered in a SOIC-16 wide-body package and the SJ in a SOIC-16 narrow-body package, which may affect PCB footprint compatibility. Both devices are suitable as functional replacements provided the target board layout accommodates the respective package dimensions.
Logic Function
High match
Supply Voltage Range
High match
Output Drive Current
High match
Package Type
Validation required
Parts at a glance
Part B
74VHC595SJ
onsemi
- Lifecycle
- Active
- Stock
- 8887 PCS
- Package
- SOIC-16
- Series
- Logic - Shift Registers
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 | 74VHC595SJ | Why it matters |
|---|---|---|---|
| Logic Type | 8-Bit Serial-In/Parallel-Out Shift Register with Output Latches | 8-Bit Serial-In/Parallel-Out Shift Register with Output Latches | Both devices perform the same core shift-register function, so they are functionally interchangeable in logic design. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Matching voltage ranges ensure either part can operate in the same 3.3 V or 5 V system without level shifting. |
| Output Type | Tri-State, Non-Inverted | Tri-State, Non-Inverted | Identical output configuration allows direct substitution in bus-driving and cascaded applications. |
| Number of Circuits | 1 | 1 | Both provide a single 8-bit shift register, so board-level channel count is unchanged. |
| Output Current (per pin) | 8 mA | 8 mA | Equal drive strength means the same loads (LEDs, logic inputs) can be driven without redesign. |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.209", 5.30mm Width) | Different body widths affect PCB footprint and land pattern, so the parts are not drop-in replacements without layout adjustment. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface mount, but the differing package width still requires verification against the board's pad geometry. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Same temperature rating ensures equivalent reliability across industrial and commercial environments. |
| Propagation Delay (typical) | 5.5 ns at 5 V | 5.5 ns at 5 V | Identical timing performance preserves signal integrity and timing margins in high-speed designs. |
| RoHS Status | RoHS Compliant | RoHS Compliant | Both meet environmental regulations, so compliance is not a differentiator for substitution. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC595MX | 74VHC595SJ |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Shift Register | Shift Register |
| Output Type | Tri-State | Tri-State |
| Number of Elements | 1 | 1 |
| Number of Bits per Element | 8 | 8 |
| Function | Serial to Parallel, Serial | Serial to Parallel, Serial |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the 74VHC595MX and 74VHC595SJ?
The primary difference is the package type and corresponding mechanical dimensions. The 74VHC595MX is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package with a nominal body width of 3.90 mm, while the 74VHC595SJ is supplied in a 16-pin SOP (Small Outline Package) with a nominal body width of 5.30 mm. Both devices are functionally identical 8-bit serial-in, parallel-out shift registers with output latches and 3-state outputs.
Are the 74VHC595MX and 74VHC595SJ electrically interchangeable?
Yes, both devices share the same 74VHC595 die and specified electrical characteristics, including 2 V to 5.5 V operating supply voltage, CMOS-compatible inputs, and ±8 mA output drive at 5 V. They differ only in package mechanical outline and thermal characteristics, so electrical interchangeability is maintained when the PCB footprint is compatible.
Can the 74VHC595MX directly replace the 74VHC595SJ on an existing PCB?
No, a direct drop-in replacement is not possible without PCB modification because the SOIC (MX) and SOP (SJ) packages have different body widths and lead spans. The 74VHC595MX SOIC body is 3.90 mm wide, while the 74VHC595SJ SOP body is 5.30 mm wide, resulting in different land patterns and lead-to-lead dimensions.
Do both devices have the same pinout and logic function?
Yes, both the 74VHC595MX and 74VHC595SJ use the standard 16-pin 74VHC595 pinout: serial data input (SER), shift register clock (SRCLK), storage register clock (RCLK), output enable (OE), serial clear (SRCLR), serial output (QH'), and eight parallel outputs (QA through QH). The logic function is identical in both packages.
What are the operating temperature ranges for these devices?
Both the 74VHC595MX and 74VHC595SJ are specified for operation over the standard industrial temperature range of -40 °C to +85 °C, as documented in the manufacturer datasheet for the 74VHC595 family.
Which package is better for high-density PCB layouts?
The 74VHC595MX in the 3.90 mm wide SOIC package is better suited for high-density PCB layouts because it occupies less board area than the 5.30 mm wide SOP package used by the 74VHC595SJ. The smaller SOIC footprint allows tighter component placement and reduced PCB real estate.
Are the maximum output current ratings the same for both parts?
Yes, both the 74VHC595MX and 74VHC595SJ share the same die-level output current specifications. At VCC = 5 V, each output is rated for ±8 mA, and the absolute maximum continuous output current per pin is ±25 mA, with a maximum total package current of ±75 mA, as specified in the 74VHC595 datasheet.
Do both devices support the same maximum shift clock frequency?
Yes, both the 74VHC595MX and 74VHC595SJ support a maximum shift register clock frequency of 115 MHz at VCC = 5 V, as specified in the 74VHC595 datasheet. The package type does not affect the maximum clock frequency rating.