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SN74HC157PWT Equivalent & Substitute Parts
Part Overview
The SN74HC157PWT is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The SN74HC157PWT operates across a 2V to 6V supply range with output currents of 7.8mA (high and low) and supports operating temperatures from -40°C to 85°C. Functionally equivalent alternatives are available from multiple manufacturers with varying product statuses and packaging options.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Type | Multiplexer |
| Circuit Configuration | 4 x 2:1 |
| Independent Circuits | 1 |
| Current - Output High | 7.8mA |
| Current - Output Low | 7.8mA |
| Voltage Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SN74HC157PWT is determined by matching the following critical parameters: circuit type (4 x 2:1 multiplexer), output current specifications (7.8mA high/low), supply voltage range (2V ~ 6V), package type (16-TSSOP), and mounting method (surface mount). Parts are grouped into three categories based on their relationship to the main part:
Parametric Equivalents share identical electrical specifications and package dimensions but differ in product status (active vs. discontinued) or packaging format (Tape & Reel vs. Cut Tape). These parts are direct functional replacements.
Direct Manufacturer Alternatives meet all electrical and mechanical requirements but may have extended operating temperature ranges or different output current ratings within acceptable tolerances.
Upgrade and Recommended Options provide enhanced specifications such as automotive qualification (AEC-Q100) or improved temperature performance while maintaining core functionality.
Parameter Comparison
| Part Number | Manufacturer | Circuit | Output Current (mA) | Supply Voltage | Operating Temp (°C) | Package | Product Status | Packaging Format |
|---|---|---|---|---|---|---|---|---|
| SN74HC157PWT | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Discontinued | Tape & Reel |
| SN74HC157APWR | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Active | Tape & Reel |
| SN74HC157PWR | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Active | Cut Tape & Digi-Reel |
| SN74HC158PWR | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Active | Tape & Reel |
| SN74HC158PWT | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Discontinued | Tape & Reel |
| SN74HC257PWR | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Active | Cut Tape & Digi-Reel |
| SN74HC258PWR | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Active | Tape & Reel |
| SN74HC258PWT | Texas Instruments | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 16-TSSOP | Discontinued | Tape & Reel |
| MC74HC157ADTR2G | onsemi | 4 x 2:1 | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 16-TSSOP | Active | Tape & Reel |
| 74HC157PW,118 | Nexperia USA Inc. | 4 x 2:1 | 5.2 / 5.2 | 2V ~ 6V | -40 ~ 125 | 16-TSSOP | Active | Tape & Reel |
| 74HC157PW-Q100,118 | Nexperia USA Inc. | 4 x 2:1 | 5.2 / 5.2 | 2V ~ 6V | -40 ~ 125 | 16-TSSOP | Active | Tape & Reel |
Engineering Selection Recommendations
For direct replacement of the discontinued SN74HC157PWT with minimal design impact, select SN74HC157APWR or SN74HC157PWR from Texas Instruments. Both parts maintain identical electrical specifications and package dimensions. SN74HC157APWR is available in Tape & Reel packaging matching the original format, while SN74HC157PWR is supplied in Cut Tape & Digi-Reel format.
For applications requiring extended operating temperature range, MC74HC157ADTR2G from onsemi provides -55°C to 125°C operation while maintaining all other electrical and mechanical parameters. This part is currently active and available in high volume.
For designs tolerating reduced output current specifications, the Nexperia USA Inc. parts 74HC157PW,118 and 74HC157PW-Q100,118 offer extended temperature performance (-40°C to 125°C) and are actively produced. The Q100 variant includes automotive AEC-Q100 qualification for applications requiring automotive-grade components. Output current is reduced to 5.2mA (high and low) compared to the original 7.8mA specification.
All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1, and identical 16-TSSOP package dimensions (0.173", 4.40mm width).
Frequently Asked Questions (FAQ)
Q: Can SN74HC157APWR directly replace SN74HC157PWT without circuit modifications?
A: Yes. SN74HC157APWR is a parametric equivalent with identical output current (7.8mA), supply voltage range (2V ~ 6V), operating temperature (-40°C ~ 85°C), and 16-TSSOP package dimensions. The only difference is product status (active vs. discontinued) and packaging format availability.
Q: What is the difference between SN74HC157PWR and SN74HC157APWR?
A: Both parts are electrically identical with 7.8mA output current and -40°C to 85°C operating range. The primary difference is packaging format: SN74HC157APWR is supplied in Tape & Reel (TR) format, while SN74HC157PWR is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.
Q: Why do the Nexperia parts (74HC157PW,118 and 74HC157PW-Q100,118) have lower output current specifications?
A: The Nexperia parts specify 5.2mA output current (high and low) compared to 7.8mA for Texas Instruments and onsemi equivalents. This represents a design variation within the 74HC157 family. Verify that your circuit design can operate within the reduced current specification before substitution.
Q: Is MC74HC157ADTR2G suitable for all applications requiring SN74HC157PWT?
A: MC74HC157ADTR2G is suitable for applications where extended operating temperature (-55°C to 125°C) is beneficial or required. The part maintains identical output current (7.8mA) and supply voltage specifications. Verify that the extended temperature range does not introduce unintended behavior in your specific application.
Q: What is the significance of the AEC-Q100 qualification on 74HC157PW-Q100,118?
A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. This variant is suitable for automotive applications requiring qualified components. Non-automotive applications do not require this qualification and may use the standard 74HC157PW,118 variant.
Q: Are all substitute parts available in the same 16-TSSOP package?
A: Yes. All listed substitute parts use the 16-TSSOP package with identical dimensions (0.173", 4.40mm width). PCB footprints and assembly processes remain unchanged across all substitutes.
Q: Which substitute part has the highest inventory availability?
A: MC74HC157ADTR2G from onsemi has the highest reported inventory at 30,200 pieces. This part is actively produced and represents a reliable long-term sourcing option.
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