74HCT138T16-13 Equivalent & Substitute Parts

Part Overview

The 74HCT138T16-13 is a 1 x 3:8 decoder/demultiplexer logic integrated circuit manufactured by Diodes Incorporated in 16-TSSOP surface mount packaging. This device decodes three input lines into eight mutually exclusive outputs, functioning as a standard TTL-compatible decoder with single supply operation. The part is active in production with 1167 units in current inventory stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple manufacturers is needed for supply chain resilience.

Key Parameters

Parameter	Value
Decoder Configuration	1 x 3:8
Output Current (High/Low)	4mA / 4mA
Supply Voltage Range	4.5V to 5.5V
Operating Temperature Range	-40°C to 125°C
Package Type	16-TSSOP (0.173" width, 4.40mm)
Mounting Type	Surface Mount
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT138T16-13 is determined by the following criteria:

Primary Substitution Parameters:

Decoder circuit configuration (1 x 3:8)
Package type (16-TSSOP with 0.173" width, 4.40mm)
Supply voltage range (4.5V to 5.5V minimum)
Output current capability (minimum 4mA high and low)
Mounting type (Surface Mount)

Secondary Compatibility Factors:

Operating temperature range (minimum -40°C to 85°C acceptable; extended to 125°C preferred)
RoHS and REACH compliance status
Moisture sensitivity level (MSL 1 acceptable)

Parts are grouped into three categories: Direct Manufacturer equivalents (identical specifications), Parametric Equivalents (functionally compatible with minor parameter variations), and Manufacturer Recommended alternatives (higher performance variants or automotive-grade options).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Circuit	Output Current (mA)	Temp Range (°C)	Package	Packaging Format	Product Status
74HCT138T16-13	Diodes Incorporated	1 x 3:8	4 / 4	-40 to 125	16-TSSOP	Tape & Reel	Active
74HCT138PW,118	NXP Semiconductors	1 x 3:8	4 / 4	-40 to 125	16-TSSOP	Bulk	Active
MC74HCT138ADTR2G	onsemi	1 x 3:8	4 / 4	-55 to 125	16-TSSOP	Tape & Reel	Active
MM74HCT138MTCX	Fairchild Semiconductor	1 x 3:8	4.8 / 4.8	-40 to 85	16-TSSOP	Bulk	Active
SN74HCT138PWR	Texas Instruments	1 x 3:8	4 / 4	-40 to 85	16-TSSOP	Cut Tape & Digi-Reel	Active
74VHCT138AMTCX	onsemi	1 x 3:8	8 / 8	-40 to 85	16-TSSOP	Tape & Reel	Active
MM74HCT138MTC	Fairchild Semiconductor	1 x 3:8	4.8 / 4.8	-40 to 85	16-TSSOP	Bulk	Active
SN74HCT138PW	Texas Instruments	1 x 3:8	4 / 4	-40 to 85	16-TSSOP	Tube	Discontinued at DiGi Electronics
74HCT138PW-Q100,11	Nexperia USA Inc.	1 x 3:8	4 / 4	-40 to 125	16-TSSOP	Tape & Reel	Active
74HCT238PW-Q100J	Nexperia USA Inc.	1 x 3:8	4 / 4	-40 to 125	16-TSSOP	Tape & Reel	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended First Choice): 74HCT138PW,118 (NXP Semiconductors) and MC74HCT138ADTR2G (onsemi) are direct functional equivalents with identical decoder configuration, output current, and supply voltage specifications. Both maintain the required 16-TSSOP package format and are in active production. MC74HCT138ADTR2G offers extended temperature range to -55°C, providing additional margin for extreme environment applications.

Automotive-Grade Alternatives: 74HCT138PW-Q100,11 and 74HCT238PW-Q100J (both Nexperia USA Inc.) are AEC-Q100 qualified automotive-grade variants with identical electrical specifications to the primary part. These are suitable for automotive and high-reliability applications requiring formal qualification documentation.

Higher Output Current Option: 74VHCT138AMTCX (onsemi) provides doubled output current capability (8mA vs. 4mA) while maintaining the same decoder configuration and package. This variant is suitable for applications requiring higher drive capability or longer PCB trace lengths.

Packaging Format Alternatives: SN74HCT138PWR (Texas Instruments) offers Cut Tape and Digi-Reel packaging formats as alternatives to standard Tape & Reel, accommodating different manufacturing and assembly processes.

Avoid: SN74HCT138PW (Texas Instruments) is discontinued at DiGi Electronics and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can I substitute 74VHCT138AMTCX for 74HCT138T16-13? A: Yes. The 74VHCT138AMTCX maintains identical decoder configuration (1 x 3:8), package type (16-TSSOP), and supply voltage range (4.5V to 5.5V). The higher output current (8mA vs. 4mA) is a superset capability and does not create incompatibility. Operating temperature range is -40°C to 85°C, which is narrower than the primary part's -40°C to 125°C specification.

Q: What is the difference between 74HCT138 and 74HCT238? A: Both are 1 x 3:8 decoder/demultiplexers in 16-TSSOP packaging with identical electrical specifications. The 74HCT238PW-Q100J variant listed is functionally equivalent and substitutable based on the provided parameters.

Q: Are packaging format differences (Tape & Reel vs. Bulk vs. Tube) electrically significant? A: No. Packaging format differences affect only manufacturing and assembly processes, not electrical performance or functionality. Selection depends on manufacturing equipment compatibility and quantity requirements.

Q: Can I use a part with a narrower operating temperature range? A: Only if your application operates within the narrower range. For example, SN74HCT138PWR (-40°C to 85°C) is suitable for applications not exceeding 85°C. For applications requiring operation to 125°C, use MC74HCT138ADTR2G, 74HCT138PW,118, or the automotive-grade variants.

Q: Is RoHS compliance mandatory for substitution? A: RoHS compliance status is provided for regulatory and procurement purposes. All listed substitutes meet ROHS3 compliance or are REACH unaffected, ensuring compatibility with environmental regulations.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity? A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling, simplifying logistics and inventory management.

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