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SN74HC251PWT Equivalent & Substitute Parts
Part Overview
The SN74HC251PWT is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, with 2114 units available in new original stock. The SN74HC251PWT operates as a single-supply logic multiplexer with output capabilities of 7.8mA high and low current, making it suitable for digital signal routing and selection applications in industrial and commercial electronics.
Due to its discontinued status, equivalent substitute parts are necessary to ensure design continuity and supply chain reliability for new production runs and long-term component availability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN74HC251PWT |
| Manufacturer | Texas Instruments |
| Type | Multiplexer 1 x 8:1 |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| Voltage Supply | 2V ~ 6V |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Discontinued at DiGi Electronics |
Substitute Part Grouping Explanation
Substitution for the SN74HC251PWT is determined by the following critical parameters:
Functional Equivalence: All substitute parts must be 1 x 8:1 multiplexer logic circuits in the 74HC series.
Package Compatibility: All substitutes must use the 16-TSSOP surface mount package (0.173", 4.40mm Width) to ensure PCB layout compatibility without redesign.
Electrical Parameters: Voltage supply range (2V ~ 6V), output current capability (minimum 7.8mA for both high and low states), and operating temperature range (-40°C minimum to 85°C minimum) must be met or exceeded.
Compliance Requirements: All substitutes must maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating.
Substitute parts are grouped into two categories:
Parametric Equivalents (Texas Instruments): SN74HC151PWR and SN74HC151PWT maintain identical electrical specifications and packaging. SN74HC251PWR provides active product status with equivalent specifications.
Manufacturer Recommended Equivalents: Parts from Nexperia USA Inc. (74HC251PW,118 and 74HC251PW-Q100J) and onsemi (MC74HC251ADTR2G and MC74HC251ADTG) meet or exceed all critical parameters with extended operating temperature ranges and active product status.
Parameter Comparison
| Parameter | SN74HC251PWT | SN74HC251PWR | SN74HC151PWR | SN74HC151PWT | 74HC251PW,118 | 74HC251PW-Q100J | MC74HC251ADTR2G | MC74HC251ADTG |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia USA Inc. | Nexperia USA Inc. | onsemi | onsemi |
| Type | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 | Multiplexer 1 x 8:1 |
| Package / Case | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Voltage Supply | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V |
| Current - Output High, Low | 7.8mA, 7.8mA | 7.8mA, 7.8mA | 7.8mA, 7.8mA | 7.8mA, 7.8mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Discontinued | Active | Discontinued | Discontinued | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Packaging Format | Tape & Reel (TR) | Tape & Reel (TR) | Cut Tape (CT) & Digi-Reel | Cut Tape (CT) & Digi-Reel | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tube |
Engineering Selection Recommendations
Primary Recommendation: SN74HC251PWR (Texas Instruments) is the direct equivalent with active product status, identical electrical specifications, and Tape & Reel packaging matching the original SN74HC251PWT. This part provides the highest compatibility with existing designs and supply chain continuity from the original manufacturer.
Secondary Recommendation: MC74HC251ADTR2G (onsemi) offers active product status with extended operating temperature range (-55°C ~ 125°C) and Tape & Reel packaging. This part is suitable for applications requiring wider temperature performance while maintaining full functional and package compatibility.
Alternative for Extended Temperature: 74HC251PW,118 (Nexperia USA Inc.) provides active product status with extended operating temperature range (-40°C ~ 125°C) and is available in Tape & Reel format. This part is appropriate for industrial applications requiring higher temperature operation.
Automotive Grade Option: 74HC251PW-Q100J (Nexperia USA Inc.) includes AEC-Q100 automotive qualification with extended operating temperature range (-40°C ~ 125°C). This part is specified for automotive and high-reliability applications.
All recommended substitutes maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, ensuring regulatory and environmental compliance equivalent to the original part.
Frequently Asked Questions (FAQ)
Q: Can SN74HC251PWR be used as a direct replacement for SN74HC251PWT?
A: Yes. SN74HC251PWR is a parametric equivalent with identical voltage supply (2V ~ 6V), output current (7.8mA high and low), operating temperature range (-40°C ~ 85°C), and 16-TSSOP package. The primary difference is active product status versus discontinued status. Tape & Reel packaging is compatible with the original part.
Q: What is the difference between the Texas Instruments 74HC251 and 74HC151 series?
A: Both are 1 x 8:1 multiplexers in 16-TSSOP packages with identical electrical specifications (2V ~ 6V supply, 7.8mA output current, -40°C ~ 85°C operating range). The primary difference is the base product number designation. SN74HC151PWR and SN74HC151PWT are functionally equivalent to SN74HC251PWT for multiplexer applications.
Q: Are Nexperia and onsemi parts compatible with the original Texas Instruments design?
A: Yes, with parameter considerations. Nexperia (74HC251PW,118 and 74HC251PW-Q100J) and onsemi (MC74HC251ADTR2G and MC74HC251ADTG) parts maintain the same 16-TSSOP package, 2V ~ 6V supply voltage, and 1 x 8:1 multiplexer function. Output current is reduced to 5.2mA (versus 7.8mA), and operating temperature ranges are extended. These differences are compatible with most applications but should be verified for designs with specific current or temperature requirements.
Q: What is the significance of the packaging format (Tape & Reel versus Cut Tape)?
A: Tape & Reel (TR) and Cut Tape (CT) formats differ in supply method. Tape & Reel is continuous reel packaging suitable for high-volume automated assembly. Cut Tape & Digi-Reel is pre-cut tape suitable for lower-volume or mixed-component orders. Both formats contain identical parts in the same 16-TSSOP package. Selection depends on production volume and assembly equipment compatibility.
Q: Why do onsemi and Nexperia parts have lower output current (5.2mA) compared to Texas Instruments (7.8mA)?
A: Output current specifications reflect manufacturer design and testing parameters. The 5.2mA specification from onsemi and Nexperia is sufficient for standard 74HC logic applications. If the design requires the full 7.8mA output current, Texas Instruments parts (SN74HC251PWR or SN74HC151PWR) are recommended.
Q: Is the automotive-grade 74HC251PW-Q100J suitable for non-automotive applications?
A: Yes. The 74HC251PW-Q100J includes AEC-Q100 automotive qualification and extended operating temperature range (-40°C ~ 125°C). These specifications exceed standard industrial requirements and provide additional reliability margin. This part is suitable for any application requiring extended temperature performance or high-reliability operation.
Q: What does ROHS3 compliance mean for component substitution?
A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All substitute parts listed maintain ROHS3 compliance, ensuring regulatory equivalence and environmental compliance with the original SN74HC251PWT.
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