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74F257ASC Equivalent & Substitute Parts
Part Overview
The 74F257ASC is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74F257ASC provides single supply operation with standard TTL-compatible switching characteristics suitable for digital signal routing applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Part Number | 74F257ASC |
| Manufacturer | onsemi |
| Type | Multiplexer |
| Circuit Configuration | 4 x 2:1 |
| Independent Circuits | 1 |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage Supply | 4.5V ~ 5.5V |
| Current - Output High, Low | 3mA, 24mA |
| Operating Temperature | 0°C ~ 70°C |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the 74F257ASC are qualified based on the following electrical and mechanical parameters:
- Circuit configuration: 4 x 2:1 multiplexer topology
- Independent circuits: 1
- Package type: 16-SOIC surface mount
- Voltage supply range: 4.5V ~ 5.5V
- Output current specifications: 3mA (high), 24mA (low)
- Operating temperature range: 0°C ~ 70°C
- Series classification: 74F logic family
All substitute parts maintain identical electrical performance and physical compatibility with the original 74F257ASC specification.
Parameter Comparison
| Parameter | 74F257ASC (onsemi) | SN74F257DR (TI) | SN74F257D (TI) | SN74F258D (TI) |
|---|---|---|---|---|
| Type | Multiplexer | Multiplexer | Multiplexer | Multiplexer |
| Circuit Configuration | 4 x 2:1 | 4 x 2:1 | 4 x 2:1 | 4 x 2:1 |
| Independent Circuits | 1 | 1 | 1 | 1 |
| Package / Case | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Voltage Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Current - Output High, Low | 3mA, 24mA | 3mA, 24mA | 3mA, 24mA | 3mA, 24mA |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C |
| Product Status | Obsolete | Active | Last Time Buy | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Packaging Option | Bulk | Tape & Reel (TR) | Tube | Tube |
Engineering Selection Recommendations
For applications currently using the 74F257ASC, the following substitutes are available based on product status and compliance:
Primary Recommendation: SN74F257DR (Texas Instruments) This part maintains active product status and ROHS3 compliance. The Tape & Reel packaging option supports high-volume production environments. Electrical and mechanical specifications are identical to the 74F257ASC.
Secondary Recommendation: SN74F258D (Texas Instruments) This part is actively manufactured with ROHS3 compliance and available in Tube packaging. It provides equivalent electrical performance and maintains the same 16-SOIC package footprint.
Alternative: SN74F257D (Texas Instruments) This part is designated Last Time Buy status with ROHS3 compliance. Tube packaging is available. Use this option only when inventory of primary recommendations is unavailable, as Last Time Buy status indicates limited future availability.
Frequently Asked Questions (FAQ)
Q: Can SN74F257DR be used as a direct replacement for 74F257ASC? A: Yes. Both parts share identical circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), voltage
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