MM74HC138N Equivalent & Substitute Parts

Part Overview

The MM74HC138N is a 3-line to 8-line decoder/demultiplexer logic IC manufactured by onsemi in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74HC138 series decoder/demultiplexer function is widely standardized across multiple manufacturers, enabling direct functional substitution with active product alternatives.

Key Parameters

Parameter	Value
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Output Current (High/Low)	5.2mA / 5.2mA
Supply Voltage Range	2V ~ 6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Base Product Number	74HC138

Substitute Part Grouping Explanation

Substitution of the MM74HC138N is determined by matching the following critical parameters:

Functional Type: Decoder/Demultiplexer with 1 x 3:8 circuit configuration
Output Current Specifications: 5.2mA high and low output current
Supply Voltage Range: 2V ~ 6V single supply operation
Package Format: 16-DIP through-hole mounting
Base Product Series: 74HC138 logic family

All substitute parts listed maintain identical electrical specifications and physical packaging, enabling direct pin-for-pin replacement in existing circuit designs. Variations in product status, manufacturer, and operating temperature ranges do not affect functional substitution capability within the specified parameter envelope.

Parameter Comparison

Parameter	MM74HC138N (onsemi)	CD74HC138E (TI)	SN74HC138N (TI)	TC74HC138APF (Toshiba)	SN74HC138AN (TI)	SN74HC138NE4 (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Toshiba Semiconductor	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Type	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8	1 x 3:8
Output Current (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
Supply Voltage Range	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Substitutes (Active Product Status)

SN74HC138N (Texas Instruments) and SN74HC138AN (Texas Instruments) are primary substitutes with identical electrical and thermal specifications to the MM74HC138N. Both parts maintain active product status with established supply chains and full RoHS3 compliance.

Extended Temperature Range Alternative

CD74HC138E (Texas Instruments) provides an extended operating temperature range of -55°C to 125°C, suitable for applications requiring broader thermal performance. This part is recommended for designs operating outside the standard -40°C to 85°C envelope.

Alternative Manufacturer Option

TC74HC138APF (Toshiba Semiconductor) offers functional equivalence with active product status and RoHS3 compliance. This part provides supply diversification for applications requiring multi-source qualification.

Parametric Equivalent

SN74HC138NE4 (Texas Instruments) functions as a parametric equivalent with identical electrical specifications and package format, suitable for direct substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can MM74HC138N be directly replaced with SN74HC138N?

A: Yes. Both parts share identical electrical specifications, output current ratings, supply voltage range, operating temperature range, and 16-DIP package format. Direct pin-for-pin substitution is supported.

Q: What is the difference between SN74HC138N and SN74HC138AN?

A: Both parts are functionally equivalent with identical electrical parameters and package specifications. The difference lies in packaging format designation (N vs. AN suffix), but both maintain the same 16-DIP through-hole configuration and are suitable for direct substitution.

Q: Is CD74HC138E compatible with the MM74HC138N application?

A: Yes, CD74HC138E is electrically compatible. It provides an extended operating temperature range (-55°C to 125°C) compared to the standard -40°C to 85°C specification. Use this part only if the extended temperature range is required for your application.

Q: Can I use TC74HC138APF as a substitute?

A: Yes. TC74HC138APF maintains all critical electrical parameters and package specifications required for substitution. It is manufactured by Toshiba Semiconductor and provides an alternative supply source for the 74HC138 decoder/demultiplexer function.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (CD74HC138E, SN74HC138N, TC74HC138APF, SN74HC138AN, SN74HC138NE4) are RoHS3 compliant. The original MM74HC138N RoHS status was not specified in the provided data.

Q: What is the significance of the 74HC138 base product number?

A: The 74HC138 base product number identifies the functional logic family and circuit configuration. All substitute parts share this base designation, confirming they implement the identical 3-line to 8-line decoder/demultiplexer function across different manufacturers.

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