SN74HC139PWT Equivalent & Substitute Parts

Part Overview

The SN74HC139PWT is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The 74HC139 series decoder/demultiplexer performs 1 x 2:4 decoding operations and is widely used in digital logic applications requiring address decoding and signal routing functions.

Key Parameters

Parameter	Value
Base Product Number	74HC139
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 2:4
Independent Circuits	2
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage Supply	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC139PWT is determined by strict equivalence across the following critical parameters:

Base product number (74HC139)
Decoder/demultiplexer type with 1 x 2:4 circuit configuration
16-TSSOP package with identical physical dimensions
Voltage supply range of 2V ~ 6V minimum
Output current specifications of 5.2mA (high and low)
Surface mount mounting type
ROHS3 compliance and MSL 1 rating

Substitute parts are grouped by manufacturer and product status. All identified substitutes maintain identical electrical specifications and package compatibility with the original part.

Parameter Comparison

Parameter	SN74HC139PWT (TI)	SN74HC139PWR (TI)	74HC139PW,118 (Nexperia)	74HC139PW-Q100J (Nexperia)	MC74HC139ADTR2G (onsemi)	NLV74HC139ADTR2G (onsemi)
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	onsemi
Product Status	Discontinued	Active	Active	Active	Active	Obsolete
Packaging	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
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
Package / Case	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
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	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 ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Grade	Standard	Standard	Standard	Automotive (AEC-Q100)	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	2041 Pcs	6600 Pcs	3479 Pcs	3341 Pcs	3700 Pcs	2000 Pcs

Engineering Selection Recommendations

Primary Substitutes (Active Status):

SN74HC139PWR from Texas Instruments is the direct active equivalent with identical electrical and thermal specifications. This part maintains the original manufacturer continuity and is available in higher inventory quantities.

74HC139PW,118 from Nexperia USA Inc. provides extended operating temperature range (-40°C ~ 125°C) while maintaining all core electrical parameters. This part is suitable for applications requiring broader temperature performance.

MC74HC139ADTR2G from onsemi offers the widest operating temperature range (-55°C ~ 125°C) and is recommended for applications with extreme temperature requirements.

74HC139PW-Q100J from Nexperia USA Inc. includes automotive-grade qualification (AEC-Q100) and is designated for automotive applications requiring this certification.

Secondary Substitute (Obsolete Status):

NLV74HC139ADTR2G from onsemi is marked as obsolete and should be avoided for new designs despite meeting electrical specifications. This part is suitable only for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HC139PWT with SN74HC139PWR?

A: Yes. Both parts share identical electrical specifications, package type (16-TSSOP), and functional characteristics. The primary difference is packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) and product status (discontinued vs. active). SN74HC139PWR is the recommended active substitute.

Q: What is the difference between the Nexperia and onsemi substitutes?

A: All three manufacturers (Texas Instruments, Nexperia, onsemi) produce functionally equivalent 74HC139 decoders. Differences exist in operating temperature ranges and certifications. Nexperia parts extend to -40°C ~ 125°C, while onsemi parts reach -55°C ~ 125°C. The 74HC139PW-Q100J variant includes automotive AEC-Q100 qualification.

Q: Is the 16-TSSOP package identical across all substitutes?

A: Yes. All substitute parts use the 16-TSSOP package with identical physical dimensions (0.173", 4.40mm width). Direct PCB footprint compatibility is maintained across all listed substitutes.

Q: Can I use NLV74HC139ADTR2G for new designs?

A: No. This part is marked as obsolete and should not be selected for new designs. It is suitable only for replacement in existing systems where legacy inventory is available.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: base product number (74HC139), decoder/demultiplexer type with 1 x 2:4 configuration, 16-TSSOP package, 2V ~ 6V supply voltage, 5.2mA output current specifications, and ROHS3 compliance. All listed substitutes meet these criteria.

Q: Does operating temperature range affect substitution decisions?

A: Operating temperature range does not prevent substitution but should be considered for application requirements. The original SN74HC139PWT operates -40°C ~ 85°C. Substitutes with extended ranges (-40°C ~ 125°C or -55°C ~ 125°C) are backward compatible and suitable for broader environmental conditions.

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