SN74HC139APWR Equivalent & Substitute Parts

Part Overview

The SN74HC139APWR is a dual 2-to-4 line decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments. This device decodes two independent 2-bit binary inputs into four mutually exclusive outputs, operating from a single supply voltage between 2V and 6V. The part is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are necessary when the primary part number becomes unavailable, when specific packaging formats are required for manufacturing processes, or when alternative sourcing is needed to optimize supply chain logistics while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 2:4
Independent Circuits	2
Current - Output High	5.2 mA
Current - Output Low	5.2 mA
Voltage Supply Source	Single Supply
Voltage - Supply Range	2V ~ 6V
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Series	74HC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC139APWR is determined by strict equivalence across the following critical parameters: decoder/demultiplexer type with 1 x 2:4 circuit configuration, dual independent circuits, identical output current specifications (5.2 mA high and low), single supply voltage operation within 2V to 6V range, operating temperature range of -40°C to 85°C, surface mount technology, and 16-TSSOP package format with 4.40mm width. All substitute parts listed maintain these electrical and mechanical specifications without deviation. Substitution is valid across different packaging formats (Cut Tape, Tape & Reel, Tube, Bulk) as these represent distribution and handling methods only and do not affect circuit performance or pin configuration. Manufacturer variation (Texas Instruments versus Fairchild Semiconductor) is permitted when all parametric specifications remain identical.

Parameter Comparison

Parameter	SN74HC139APWR	SN74HC139PWR	SN74HC139PWT	MM74HC139MTCX	SN74HC139APW	SN74HC139PW
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Fairchild Semiconductor	Texas Instruments	Texas Instruments
Type	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer
Circuit Configuration	1 x 2:4	1 x 2:4	1 x 2:4	1 x 2:4	1 x 2:4	1 x 2:4
Independent Circuits	2	2	2	2	2	2
Current - Output High, Low	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA
Voltage Supply Source	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP (0.173", 4.40mm Width)
Series	74HC	74HC	74HC	74HC	74HC	74HC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	Not Specified	1 (Unlimited)
Product Status	Active	Active	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

SN74HC139PWR and SN74HC139APW are the preferred substitute options. Both maintain Active product status with identical electrical specifications and RoHS3 compliance. SN74HC139PWR is available in Cut Tape and Digi-Reel packaging with 6600 units in stock, providing optimal availability for high-volume production. SN74HC139APW is supplied in Bulk packaging with 14157 units in stock, suitable for manufacturing environments requiring large quantity handling.

Secondary Substitutes (Active Status, Compliance Considerations):

MM74HC139MTCX from Fairchild Semiconductor maintains Active status and identical electrical performance. This part carries MSL 3 rating (168 hours) compared to MSL 1 (unlimited) of the primary part, requiring controlled moisture exposure during storage and handling. This substitute is appropriate for applications where moisture sensitivity management is feasible within manufacturing processes.

Discontinued Parts (Not Recommended for New Designs):

SN74HC139PWT and SN74HC139PW are discontinued at DiGi Electronics and should not be selected for new production designs despite maintaining identical electrical specifications. These parts may be used only for legacy system maintenance or repair applications where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can SN74HC139PWR be used as a direct replacement for SN74HC139APWR?

A: Yes. Both parts are parametrically equivalent across all electrical and mechanical specifications. The difference lies in packaging format: SN74HC139APWR is supplied in prototype/bulk format, while SN74HC139PWR is supplied in Cut Tape and Digi-Reel formats. Pin configuration, voltage ratings, current specifications, temperature range, and package dimensions are identical.

Q: What is the difference between the packaging options listed?

A: Packaging format refers to the distribution method and does not affect circuit performance. Cut Tape (CT) and Digi-Reel are automated assembly formats. Tape & Reel (TR) is standard reel packaging. Tube and Bulk are manual handling formats. All formats contain the identical 16-TSSOP component with identical electrical characteristics.

Q: Why is MM74HC139MTCX listed as a substitute if it has different MSL rating?

A: MM74HC139MTCX maintains all critical electrical and mechanical parameters required for functional equivalence. The MSL 3 rating (168 hours) indicates moisture sensitivity requiring controlled storage conditions, whereas MSL 1 (unlimited) has no moisture sensitivity restrictions. Selection depends on manufacturing environment capability to manage moisture exposure during the 168-hour window.

Q: Are the discontinued parts (SN74HC139PWT, SN74HC139PW) still usable?

A: Discontinued parts retain identical electrical specifications and remain functionally equivalent. However, they should not be selected for new production designs due to supply uncertainty. These parts are appropriate only for maintenance, repair, or legacy system support where existing inventory is available.

Q: What determines whether a part can substitute for SN74HC139APWR?

A: Substitution is determined by strict equivalence in: decoder/demultiplexer type, 1 x 2:4 circuit configuration, dual independent circuits, 5.2 mA output current (high and low), single supply voltage 2V to 6V, operating temperature -40°C to 85°C, surface mount technology, and 16-TSSOP package with 4.40mm width. All listed substitutes meet these criteria without exception.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes, all listed substitute parts share identical pin configuration and 16-TSSOP package dimensions. PCB layout, footprint, and schematic connections require no modification. Component selection can be made based on packaging availability, inventory levels, and compliance requirements without design changes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message