74LVC257ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC257ADB,112 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74LVC257 series provides single-supply operation across a wide voltage range (1.2V to 3.6V) with symmetric output drive capability (24mA high and low), suitable for low-voltage digital signal routing applications.

Key Parameters

Parameter	Value
Part Number	74LVC257ADB,112
Manufacturer	Nexperia USA Inc.
Circuit Type	Multiplexer 4 x 2:1
Package / Case	16-SSOP (0.209", 5.30mm Width)
Voltage Supply Range	1.2V ~ 3.6V
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LVC257ADB,112 is determined by the following critical parameters:

Circuit configuration: 4 x 2:1 multiplexer topology
Output drive capability: 24mA symmetric (high and low)
Single supply operation with overlapping voltage ranges
Surface mount package compatibility (SSOP or TSSOP variants)
Operating temperature range coverage
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories based on package type: 16-SSOP (direct footprint equivalent) and 16-TSSOP (alternative surface mount package with different pitch). Parts from different manufacturers (Nexperia, Fairchild Semiconductor, Texas Instruments) are included where electrical specifications align with the original part's functional requirements.

Parameter Comparison

Part Number	Manufacturer	Package	Voltage Supply	Temp Range	Status	Output Current
74LVC257ADB,112	Nexperia USA Inc.	16-SSOP	1.2V ~ 3.6V	-40°C ~ 125°C	Obsolete	24mA / 24mA
74LVC257APW,118	Nexperia USA Inc.	16-TSSOP	1.2V ~ 3.6V	-40°C ~ 125°C	Active	24mA / 24mA
74LCX257MTCX	Fairchild Semiconductor	16-TSSOP	2V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
CLVC257AQPWRG4Q1	Texas Instruments	16-TSSOP	2V ~ 3.6V	-40°C ~ 125°C	Active	24mA / 24mA
SN74LVC257ADBR	Texas Instruments	16-SSOP	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC257AMPWREP	Texas Instruments	16-TSSOP	2V ~ 3.6V	-55°C ~ 125°C	Active	24mA / 24mA
SN74LVC257APW	Texas Instruments	16-TSSOP	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC257APWR	Texas Instruments	16-TSSOP	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC257APWRG4	Texas Instruments	16-TSSOP	1.65V ~ 3.6V	-40°C ~ 85°C	Discontinued at DiGi Electronics	24mA / 24mA
SN74LVC257APWT	Texas Instruments	16-TSSOP	1.65V ~ 3.6V	-40°C ~ 85°C	Active	24mA / 24mA
SN74LVC257AQPWREP	Texas Instruments	16-TSSOP	2V ~ 3.6V	-40°C ~ 125°C	Active	24mA / 24mA

Engineering Selection Recommendations

For designs currently using the obsolete 74LVC257ADB,112, the following selection criteria apply:

Direct SSOP Package Replacement: SN74LVC257ADBR (Texas Instruments) maintains the 16-SSOP footprint and is actively manufactured. This part provides identical pinout compatibility and requires no PCB layout modifications. Voltage supply range is 1.65V to 3.6V, which covers most applications within the original part's 1.2V minimum specification.

TSSOP Package Alternatives: For designs that can accommodate a package change to 16-TSSOP, multiple active alternatives exist. 74LVC257APW,118 (Nexperia) is the direct series continuation and maintains the full 1.2V to 3.6V supply range with active product status. Texas Instruments SN74LVC257APWT and SN74LVC257APWR offer equivalent electrical performance with 1.65V to 3.6V supply range and active status.

Extended Temperature Range: SN74LVC257AMPWREP and SN74LVC257AQPWREP extend the upper operating temperature to 125°C, matching the original part's thermal specification. SN74LVC257AMPWREP additionally extends the lower temperature to -55°C.

Automotive Grade Option: CLVC257AQPWRG4Q1 (Texas Instruments) provides AEC-Q100 automotive qualification with -40°C to 125°C operating range, suitable for automotive and industrial applications requiring enhanced reliability certification.

All substitute parts maintain RoHS3 compliance, MSL rating of 1 (unlimited), and 24mA symmetric output drive capability required for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can I use a 16-TSSOP package part as a direct replacement for the 16-SSOP 74LVC257ADB,112?

A: No. While electrically equivalent, SSOP and TSSOP packages have different pin pitches and footprints. TSSOP parts require PCB layout redesign. For direct footprint compatibility, use SN74LVC257ADBR (16-SSOP).

Q: What is the minimum voltage supply requirement for substitute parts?

A: The original 74LVC257ADB,112 operates from 1.2V. Most active substitutes (SN74LVC257 series from Texas Instruments) operate from 1.65V minimum. The 74LVC257APW,118 from Nexperia maintains the 1.2V minimum. Verify your application's minimum supply voltage before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL rating of 1 (unlimited moisture sensitivity level).

Q: Which substitute part has the widest operating temperature range?

A: SN74LVC257AMPWREP operates from -55°C to 125°C, providing the broadest temperature coverage. The original part and most alternatives operate from -40°C to 85°C or -40°C to 125°C.

Q: Can I use the 74LCX257MTCX from Fairchild Semiconductor?

A: Yes, electrically. However, this part has a narrower voltage supply range (2V to 3.6V) and reduced operating temperature range (-40°C to 85°C) compared to the original. Verify compatibility with your application's supply voltage and thermal requirements.

Q: What packaging options are available for active parts?

A: Active substitutes are available in 16-SSOP (SN74LVC257ADBR) and 16-TSSOP (multiple options from Nexperia and Texas Instruments). Packaging options include Tape & Reel, Cut Tape, Tube, and Bulk formats depending on the specific part number.

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