SN74LVC257AQDREP Equivalent & Substitute Parts

Part Overview

The SN74LVC257AQDREP is a 4 x 2:1 multiplexer logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SN74LVC257AQDREP operates as a single-supply multiplexer with 24mA output current capability across a 2V to 3.6V supply range and -40°C to 125°C operating temperature span.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC257AQDREP
Manufacturer	Texas Instruments
Type	Multiplexer
Circuit Configuration	4 x 2:1
Independent Circuits	1
Current - Output High/Low	24mA / 24mA
Voltage Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74LVC257AQDREP is determined by the following critical parameters:

Circuit Configuration: 4 x 2:1 multiplexer topology
Package Type: 16-SOIC surface mount form factor
Output Current: 24mA minimum for both high and low states
Supply Voltage Range: Minimum 2V operation required
Operating Temperature: -40°C to 125°C range
Mounting Type: Surface mount compatibility

Substitute parts are grouped into two categories: manufacturer-recommended direct replacements and parametric equivalents that meet the electrical and mechanical specifications of the original part.

Parameter Comparison

Part Number	Manufacturer	Product Status	Circuit	Output Current (mA)	Supply Voltage (V)	Temp Range (°C)	Package	Packaging Type
SN74LVC257AQDREP	Texas Instruments	Obsolete	4 x 2:1	24 / 24	2.0 ~ 3.6	-40 ~ 125	16-SOIC	Tube
SN74LVC257ADR	Texas Instruments	Active	4 x 2:1	24 / 24	1.65 ~ 3.6	-40 ~ 85	16-SOIC	Tape & Reel
SN74LVC157AQDREP	Texas Instruments	Active	4 x 2:1	24 / 24	2.0 ~ 3.6	-40 ~ 125	16-SOIC	Tape & Reel
SN74LVC157AQDRG4Q1	Texas Instruments	Active	4 x 2:1	24 / 24	2.0 ~ 3.6	-40 ~ 125	16-SOIC	Tape & Reel
SN74LVC257AQDRG4Q1	Texas Instruments	Active	4 x 2:1	24 / 24	2.0 ~ 3.6	-40 ~ 125	16-SOIC	Cut Tape
74LCX257MX	Fairchild Semiconductor	Active	4 x 2:1	24 / 24	2.0 ~ 3.6	-40 ~ 85	16-SOIC	Tube
74LVC157AD,118	NXP Semiconductors	Active	4 x 2:1	24 / 24	1.2 ~ 3.6	-40 ~ 125	16-SOIC	Bulk
74LVC257AD,118	Nexperia USA Inc.	Active	4 x 2:1	24 / 24	1.2 ~ 3.6	-40 ~ 125	16-SOIC	Tape & Reel
MC74LCX257DR2G	onsemi	Active	4 x 2:1	8 / 8	2.3 ~ 3.6	-40 ~ 85	16-SOIC	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: SN74LVC257ADR (Texas Instruments) or SN74LVC257AD,118 (Nexperia USA Inc.) are the preferred manufacturer-recommended direct replacements. Both maintain active product status, ROHS3 compliance, and identical circuit configuration with 24mA output current capability in 16-SOIC packaging.

Automotive-Grade Alternative: SN74LVC257AQDRG4Q1 (Texas Instruments) provides AEC-Q100 qualification and automotive-grade certification while maintaining identical electrical parameters and extended temperature range (-40°C to 125°C). This part is suitable for applications requiring automotive qualification.

Extended Supply Voltage Range: 74LVC157AD,118 (NXP Semiconductors) and 74LVC257AD,118 (Nexperia USA Inc.) support a lower minimum supply voltage of 1.2V compared to the original 2.0V specification, providing additional design flexibility for low-voltage applications.

Current Output Limitation: MC74LCX257DR2G (onsemi) provides reduced output current of 8mA per channel. This part is suitable only for applications where lower drive capability is acceptable and should not be selected for designs requiring the full 24mA output current specification.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC257ADR directly replace SN74LVC257AQDREP?

A: Yes. SN74LVC257ADR is a manufacturer-recommended replacement with identical circuit configuration, output current (24mA), package type (16-SOIC), and mounting method. The primary difference is operating temperature range: SN74LVC257ADR operates -40°C to 85°C versus the original -40°C to 125°C. Verify your application's temperature requirements before selection.

Q: What is the difference between SN74LVC257 and SN74LVC157 series?

A: Both are 4 x 2:1 multiplexers in 16-SOIC packaging with identical electrical specifications. The primary distinction is the base product number designation. SN74LVC157AQDREP and SN74LVC157AQDRG4Q1 are parametric equivalents suitable for direct substitution based on matching circuit topology and electrical parameters.

Q: Why does MC74LCX257DR2G have lower output current?

A: MC74LCX257DR2G is specified with 8mA output current versus 24mA for the original part. This reduced current capability limits its application scope. Select this part only if your circuit design accommodates lower drive current requirements.

Q: Are NXP 74LVC257AD,118 and 74LVC157AD,118 parts interchangeable?

A: Yes, both NXP parts are 4 x 2:1 multiplexers in 16-SOIC packaging with 24mA output current and -40°C to 125°C operating range. The base product number difference (257 versus 157) does not affect functional compatibility for multiplexer applications.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT), Tube, and Bulk packaging formats. Tape & Reel and Cut Tape are standard for high-volume production. Verify packaging compatibility with your assembly process requirements.

Q: Do all substitutes maintain ROHS3 compliance?

A: Most active substitutes maintain ROHS3 compliance. Verify specific RoHS certification status for each selected part, particularly for 74LCX257MX (Fairchild Semiconductor), which does not list explicit RoHS status in available documentation.

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