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74LVC257APW,112 Equivalent & Substitute Parts
Part Overview
The 74LVC257APW,112 is a 4 x 2:1 multiplexer logic IC manufactured by Nexperia USA Inc. in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device functions as a data selector, routing one of four input pairs to a single output based on control signals. Substitute parts must maintain functional equivalence through matching circuit topology, electrical performance, and package compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Circuit Configuration | 4 x 2:1 Multiplexer |
| Independent Circuits | 1 |
| Output Current (High/Low) | 24mA / 24mA |
| Supply Voltage Range | 1.2V – 3.6V |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | 16-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Compliance | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following criteria:
Primary Matching Criteria:
- Circuit topology: 4 x 2:1 multiplexer configuration
- Package type: 16-TSSOP or compatible package
- Output current capability: 24mA minimum (high and low)
- Supply voltage overlap with original specification
- Operating temperature range compatibility
Secondary Considerations:
- Product status (active parts preferred over discontinued)
- RoHS and compliance certifications
- Moisture sensitivity level
Parts are grouped into two categories: direct substitutes (matching all primary criteria within the 16-TSSOP package) and functional alternatives (different package but equivalent electrical performance).
Parameter Comparison
| Part Number | Manufacturer | Circuit | Output Current (mA) | Supply Voltage (V) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|
| 74LVC257APW,112 | Nexperia USA Inc. | 4 x 2:1 | 24 / 24 | 1.2 – 3.6 | -40 to 125 | 16-TSSOP | Obsolete |
| SN74LVC257APW | Texas Instruments | 4 x 2:1 | 24 / 24 | 1.65 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| SN74LVC257APWR | Texas Instruments | 4 x 2:1 | 24 / 24 | 1.65 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| SN74LVC257APWT | Texas Instruments | 4 x 2:1 | 24 / 24 | 1.65 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| SN74LVC257AMPWREP | Texas Instruments | 4 x 2:1 | 24 / 24 | 2.0 – 3.6 | -55 to 125 | 16-TSSOP | Active |
| CLVC257AQPWRG4Q1 | Texas Instruments | 4 x 2:1 | 24 / 24 | 2.0 – 3.6 | -40 to 125 | 16-TSSOP | Active |
| 74LCX257MTCX | Fairchild Semiconductor | 4 x 2:1 | 24 / 24 | 2.0 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| MC74LCX257DTG | onsemi | 4 x 2:1 | 8 / 8 | 2.3 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| MC74LCX257DTR2G | onsemi | 4 x 2:1 | 8 / 8 | 2.3 – 3.6 | -40 to 85 | 16-TSSOP | Active |
| SN74LVC257ADBR | Texas Instruments | 4 x 2:1 | 24 / 24 | 1.65 – 3.6 | -40 to 85 | 16-SSOP | Active |
Engineering Selection Recommendations
Direct Substitutes (16-TSSOP Package, 24mA Output Current):
SN74LVC257APW, SN74LVC257APWR, and SN74LVC257APWT from Texas Instruments are functionally equivalent to the original part. All three maintain 24mA output current capability and are available in active product status. These parts differ only in packaging format (tube, tape & reel variations) and represent the most straightforward replacement path. Supply voltage range is slightly narrower (1.65V minimum vs. 1.2V), which is acceptable for most applications operating above 1.65V.
Extended Temperature Range Alternative:
SN74LVC257AMPWREP extends the upper operating temperature to 125°C, matching the original specification. This part is recommended for applications requiring the full -55°C to 125°C range.
Automotive-Qualified Alternative:
CLVC257AQPWRG4Q1 from Texas Instruments carries AEC-Q100 automotive qualification and maintains full parameter compatibility including the -40°C to 125°C temperature range. This part is suitable for automotive and high-reliability applications.
Reduced Output Current Alternatives:
MC74LCX257DTG and MC74LCX257DTR2G from onsemi provide 4 x 2:1 multiplexer functionality in 16-TSSOP packaging but with reduced output current (8mA vs. 24mA). These parts are suitable only for applications with lower current drive requirements.
Package Variant:
SN74LVC257ADBR is available in 16-SSOP package (0.209", 5.30mm width) instead of 16-TSSOP. This part maintains 24mA output current and active status but requires PCB layout modification due to different pin pitch and package dimensions.
Frequently Asked Questions (FAQ)
Q: Can I use MC74LCX257DTG as a direct replacement for 74LVC257APW,112?
A: The MC74LCX257DTG maintains the same 4 x 2:1 multiplexer circuit and 16-TSSOP package, but output current is reduced to 8mA versus the original 24mA. Substitution is valid only if your application does not require the higher current drive capability.
Q: What is the difference between SN74LVC257APW, SN74LVC257APWR, and SN74LVC257APWT?
A: These three parts are electrically identical. The suffix indicates packaging format: APW is tube packaging, APWR is tape & reel, and APWT is also tape & reel. Selection depends on your procurement and assembly requirements.
Q: Is the 74LCX257MTCX from Fairchild a suitable replacement?
A: Yes. The 74LCX257MTCX maintains 24mA output current, 4 x 2:1 circuit topology, and 16-TSSOP package compatibility. The primary difference is the narrower supply voltage range (2.0V minimum vs. 1.2V), which is acceptable for standard logic applications.
Q: Why does CLVC257AQPWRG4Q1 have a different base part number?
A: CLVC257AQPWRG4Q1 is a Texas Instruments automotive-grade variant of the 74LVC257 family. The "CLVC" prefix and "AEC-Q100" qualification indicate automotive-level testing and reliability. Electrical performance and pinout remain compatible with standard 74LVC257 parts.
Q: Can I substitute SN74LVC257ADBR if my PCB is designed for 16-TSSOP?
A: No. SN74LVC257ADBR uses 16-SSOP packaging with different pin spacing (0.209" vs. 0.173" width). PCB layout and footprint modifications are required. Use this part only if your design can accommodate the larger package.
Q: What is the minimum supply voltage for each substitute?
A: Original part: 1.2V. SN74LVC257 series (APW, APWR, APWT, ADBR): 1.65V. SN74LVC257AMPWREP and CLVC257AQPWRG4Q1: 2.0V. 74LCX257MTCX: 2.0V. MC74LCX257 series: 2.3V. Verify your application's minimum supply voltage against these specifications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL Level 1 (unlimited moisture sensitivity), matching the original part's environmental specifications.
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