74HCT138S16-13 Equivalent & Substitute Parts

Part Overview

The 74HCT138S16-13 is a decoder/demultiplexer logic integrated circuit manufactured by Diodes Incorporated. This device features a 1 x 3:8 decoder configuration in a 16-SOIC surface mount package. The part is currently active in production with 20,200 units in stock. Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from different manufacturers while maintaining functional and electrical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT138S16-13
Manufacturer	Diodes Incorporated
Type	Decoder/Demultiplexer
Circuit Configuration	1 x 3:8
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage Supply	4.5V ~ 5.5V
Current - Output High, Low	4mA, 4mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HCT138S16-13 is determined by the following critical parameters:

Circuit configuration (1 x 3:8 decoder/demultiplexer function)
Voltage supply range (4.5V ~ 5.5V)
Output current specifications (4mA minimum for both high and low states)
Package type (16-SOIC surface mount)
Operating temperature range compatibility
RoHS and compliance certifications

All substitute parts listed maintain the same base product number (74HCT138) and decoder/demultiplexer functionality. Substitutes are grouped by their relationship to the main part: direct manufacturer alternatives, upgrades with extended temperature ranges, manufacturer-recommended alternatives, and parametric equivalents. Packaging format variations (Tape & Reel, Tube, Bulk) do not affect electrical compatibility but may impact procurement and assembly processes.

Parameter Comparison

Part Number	Manufacturer	Circuit	Voltage Supply	Output Current (High/Low)	Operating Temp	Package	Status
74HCT138S16-13	Diodes Incorporated	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 125°C	16-SOIC	Active
MC74HCT138ADR2G	onsemi	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-55°C ~ 125°C	16-SOIC	Active
MM74HCT138MX	Fairchild Semiconductor	1 x 3:8	4.5V ~ 5.5V	4.8mA / 4.8mA	-40°C ~ 85°C	16-SOIC	Active
SN74HCT138DR	Texas Instruments	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 85°C	16-SOIC	Active
CD74HCT138M96	Texas Instruments	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-55°C ~ 125°C	16-SOIC	Active
MM74HCT138M	Fairchild Semiconductor	1 x 3:8	4.5V ~ 5.5V	4.8mA / 4.8mA	-40°C ~ 85°C	16-SOIC	Active
SN74HCT138D	Texas Instruments	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics
SN74HCT138DG4	Texas Instruments	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics
SN74HCT138DT	Texas Instruments	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics
74HCT138D,653	Nexperia USA Inc.	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 125°C	16-SOIC	Active
74HCT138D-Q100,118	NXP USA Inc.	1 x 3:8	4.5V ~ 5.5V	4mA / 4mA	-40°C ~ 125°C	16-SOIC	Active

Engineering Selection Recommendations

For applications requiring the widest operating temperature range (-55°C to 125°C), the MC74HCT138ADR2G from onsemi and CD74HCT138M96 from Texas Instruments are suitable alternatives. Both maintain the specified voltage supply and output current parameters while extending the lower temperature limit.

For standard industrial applications within the -40°C to 125°C range, the 74HCT138D,653 from Nexperia USA Inc. and 74HCT138D-Q100,118 from NXP USA Inc. provide direct parametric equivalence with active product status.

The SN74HCT138DR from Texas Instruments is available in Cut Tape and Digi-Reel packaging formats, offering flexibility for different procurement and assembly workflows while maintaining full electrical compatibility.

Parts marked as discontinued at DiGi Electronics (SN74HCT138D, SN74HCT138DG4, SN74HCT138DT) retain full functional compatibility but may have limited availability through distribution channels.

The MM74HCT138MX and MM74HCT138M from Fairchild Semiconductor feature slightly elevated output current specifications (4.8mA versus 4mA) and operate within the -40°C to 85°C range, suitable for applications not requiring extended temperature performance.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74HCT138S16-13 with any of the listed alternatives?

A: Yes, all listed parts share the same 1 x 3:8 decoder/demultiplexer circuit configuration, 4.5V to 5.5V supply voltage, and 16-SOIC package format. Electrical compatibility is maintained across all alternatives. Verify your application's operating temperature requirements against each substitute's temperature range.

Q: What is the difference between the various Texas Instruments part numbers (SN74HCT138DR, SN74HCT138D, SN74HCT138DG4, SN74HCT138DT)?

A: These parts differ primarily in packaging format. SN74HCT138DR is supplied in Cut Tape and Digi-Reel format. SN74HCT138D is supplied in Tube. SN74HCT138DG4 and SN74HCT138DT have different packaging designations. All three are discontinued at DiGi Electronics but maintain identical electrical specifications. The packaging format affects procurement and assembly processes but not circuit performance.

Q: Why do some substitutes have different output current ratings (4.8mA versus 4mA)?

A: The MM74HCT138MX and MM74HCT138M from Fairchild Semiconductor specify 4.8mA output current for both high and low states, compared to 4mA for most other alternatives. This represents a higher current capability and does not prevent substitution. Applications designed for 4mA operation will function correctly with 4.8mA-rated parts.

Q: Which substitute offers the best temperature range coverage?

A: The MC74HCT138ADR2G from onsemi and CD74HCT138M96 from Texas Instruments both operate from -55°C to 125°C, extending the lower temperature limit by 15°C compared to the original 74HCT138S16-13. These are suitable for applications requiring enhanced cold-temperature performance.

Q: Are there automotive-qualified alternatives available?

A: Yes, the 74HCT138D-Q100,118 from NXP USA Inc. carries AEC-Q100 automotive qualification. This part is suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: What is the difference between Tape & Reel, Tube, and Bulk packaging?

A: Tape & Reel packaging is optimized for automated assembly processes. Tube packaging is used for manual handling and smaller volume applications. Bulk packaging is used for large quantity orders. All three formats contain electrically identical components; the difference is in procurement and assembly workflow compatibility.

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