SN74HC251PW Equivalent & Substitute Parts

Part Overview

The SN74HC251PW is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SN74HC251PW operates from a single 2V to 6V supply with output currents of 7.8mA (high and low), serving applications requiring 8-to-1 data selection in compact form factors.

Key Parameters

Parameter	Value
Type	Multiplexer 1 x 8:1
Circuit Configuration	1 x 8:1
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	2V ~ 6V
Operating Temperature Range	-40°C ~ 85°C
Current Output (High/Low)	7.8mA / 7.8mA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC251PW is determined by strict equivalence in the following parameters: circuit configuration (1 x 8:1 multiplexer), package type (16-TSSOP), voltage supply range (2V ~ 6V minimum), and surface mount mounting type. All substitute parts listed maintain these core electrical and mechanical specifications.

Substitutes are grouped into two categories:

Direct Manufacturer Equivalent: SN74HC251PWR maintains identical electrical specifications (7.8mA output current, -40°C ~ 85°C operating range) with the only difference being packaging format (Tape & Reel versus Tube). This part is Active status.

Parametric Equivalents and Manufacturer Recommended Alternatives: Parts from Nexperia USA Inc. (74HC251PW,118 and 74HC251PW-Q100J) and onsemi (MC74HC251ADTG and MC74HC251ADTR2G) meet the core substitution criteria with variations in output current (5.2mA versus 7.8mA), extended operating temperature ranges (-55°C ~ 125°C or -40°C ~ 125°C), and product status (Active). The 74HC251PW-Q100J includes automotive qualification (AEC-Q100).

Parameter Comparison

Part Number	Manufacturer	Packaging	Circuit	Output Current (mA)	Voltage Supply	Temp Range (°C)	Product Status	Inventory (Pcs)
SN74HC251PW	Texas Instruments	Tube	1 x 8:1	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Discontinued at DiGi Electronics	6463
SN74HC251PWR	Texas Instruments	Tape & Reel	1 x 8:1	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Active	5354
SN74HC151PW	Texas Instruments	Tube	1 x 8:1	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Discontinued at DiGi Electronics	1118
74HC251PW,118	Nexperia USA Inc.	Tape & Reel	1 x 8:1	5.2 / 5.2	2V ~ 6V	-40 ~ 125	Active	2889
74HC251PW-Q100J	Nexperia USA Inc.	Tape & Reel	1 x 8:1	5.2 / 5.2	2V ~ 6V	-40 ~ 125	Active	1106
MC74HC251ADTG	onsemi	Tube	1 x 8:1	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Active	1516
MC74HC251ADTR2G	onsemi	Tape & Reel	1 x 8:1	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Active	1610

Engineering Selection Recommendations

For direct replacement of discontinued SN74HC251PW units, SN74HC251PWR is the primary choice, offering identical electrical performance with Active product status and higher inventory availability (5354 pcs). This part differs only in packaging format (Tape & Reel).

For applications requiring extended operating temperature range (-55°C ~ 125°C or -40°C ~ 125°C), onsemi parts (MC74HC251ADTG, MC74HC251ADTR2G) and Nexperia parts (74HC251PW,118, 74HC251PW-Q100J) are suitable alternatives. These parts maintain the 2V ~ 6V supply voltage and 16-TSSOP package compatibility. Output current is reduced to 5.2mA, which is acceptable for most applications within the specified voltage and temperature operating envelope.

For automotive applications requiring AEC-Q100 qualification, 74HC251PW-Q100J from Nexperia is the designated choice.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical package dimensions (16-TSSOP, 0.173" width, 4.40mm).

Frequently Asked Questions (FAQ)

Q: Can SN74HC251PWR replace SN74HC251PW directly?

A: Yes. SN74HC251PWR is electrically and functionally identical to SN74HC251PW. The only difference is packaging format: SN74HC251PWR is supplied in Tape & Reel format while SN74HC251PW is supplied in Tube format. Both maintain 7.8mA output current, 2V ~ 6V supply voltage, and -40°C ~ 85°C operating range.

Q: What is the difference between the Texas Instruments and Nexperia versions?

A: Texas Instruments parts (SN74HC251PW, SN74HC251PWR) deliver 7.8mA output current and operate from -40°C to 85°C. Nexperia parts (74HC251PW,118, 74HC251PW-Q100J) deliver 5.2mA output current with extended temperature range to 125°C. Both maintain the 2V ~ 6V supply voltage and 16-TSSOP package. Selection depends on output current requirements and temperature operating envelope.

Q: Are onsemi MC74HC251ADTG and MC74HC251ADTR2G interchangeable?

A: Yes, electrically and functionally. MC74HC251ADTG is supplied in Tube packaging while MC74HC251ADTR2G is supplied in Tape & Reel packaging. Both deliver 5.2mA output current and operate from -55°C to 125°C in the 16-TSSOP package.

Q: What does the "Q100J" designation in 74HC251PW-Q100J indicate?

A: The Q100J designation indicates AEC-Q100 automotive qualification. This part is suitable for automotive applications requiring automotive-grade component certification. Electrical specifications remain identical to 74HC251PW,118.

Q: Can I use a part with lower output current (5.2mA vs 7.8mA)?

A: Output current capability depends on application load requirements. Parts with 5.2mA output (Nexperia and onsemi versions) are suitable for applications where load current does not exceed this specification. Verify load impedance and current draw before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SN74HC251PW specifications.

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