CD74HC238PWT Equivalent & Substitute Parts

Part Overview

The CD74HC238PWT is a 1 x 3:8 decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-TSSOP surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The 74HC238 series decoder functions as a high-speed CMOS logic device suitable for address decoding and data routing applications across industrial and commercial temperature ranges.

Key Parameters

Parameter	Value
Decoder Configuration	1 x 3:8
Output Current (High/Low)	5.2 mA / 5.2 mA
Supply Voltage Range	2V to 6V
Operating Temperature Range	-55°C to 125°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD74HC238PWT is determined by strict equivalence across the following parameters: decoder configuration (1 x 3:8), output current specifications (5.2 mA high and low), supply voltage range (2V to 6V), operating temperature range (-55°C to 125°C), package type (16-TSSOP), and surface mount mounting type. All substitute parts listed maintain these electrical and mechanical specifications, ensuring functional interchangeability within the same circuit design.

Substitute parts are grouped into three categories: Texas Instruments parametric equivalents (CD74HC137PWR, CD74HC137PWT, CD74HC237PWR, CD74HC237PWT, CD74HC238PWR), direct equivalents from alternative manufacturers (MC74HC238ADTR2G from onsemi), and manufacturer-recommended alternatives (74HC238PW,118 and 74HC238PW-Q100J from Nexperia USA Inc.). Additional parametric equivalents from onsemi (MC74HC138ADTR2G, NLV74HC138ADTR2G) maintain identical electrical performance and package specifications.

Parameter Comparison

Part Number	Manufacturer	Base Product	Packaging	Product Status	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package
CD74HC238PWT	Texas Instruments	74HC238	Tape & Reel (TR)	Discontinued at DiGi Electronics	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
CD74HC238PWR	Texas Instruments	74HC238	Cut Tape (CT) & Digi-Reel®	Active	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
CD74HC237PWR	Texas Instruments	74HC237	Cut Tape (CT) & Digi-Reel®	Active	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
CD74HC237PWT	Texas Instruments	74HC237	Tape & Reel (TR)	Discontinued at DiGi Electronics	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
CD74HC137PWR	Texas Instruments	74HC137	Tape & Reel (TR)	Active	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
CD74HC137PWT	Texas Instruments	74HC137	Tape & Reel (TR)	Discontinued at DiGi Electronics	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
MC74HC238ADTR2G	onsemi	74HC238	Cut Tape (CT) & Digi-Reel®	Active	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
MC74HC138ADTR2G	onsemi	74HC138	Cut Tape (CT) & Digi-Reel®	Active	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
NLV74HC138ADTR2G	onsemi	74HC138	Cut Tape (CT) & Digi-Reel®	Obsolete	5.2 / 5.2	2V - 6V	-55 to 125	16-TSSOP
74HC238PW,118	Nexperia USA Inc.	74HC238	Cut Tape (CT) & Digi-Reel®	Active	5.2 / 5.2	2V - 6V	-40 to 125	16-TSSOP
74HC238PW-Q100J	Nexperia USA Inc.	74HC238	Tape & Reel (TR)	Active	5.2 / 5.2	2V - 6V	-40 to 125	16-TSSOP

Engineering Selection Recommendations

For active production and new designs, CD74HC238PWR (Texas Instruments, active status) and MC74HC238ADTR2G (onsemi, active status) are primary selections, both available in Cut Tape and Digi-Reel packaging with full inventory availability. These parts maintain identical electrical specifications and 16-TSSOP package compatibility with the discontinued CD74HC238PWT.

For automotive applications requiring AEC-Q100 qualification, 74HC238PW-Q100J from Nexperia USA Inc. is specified with automotive-grade certification and active product status. The standard Nexperia alternative 74HC238PW,118 operates across a narrower temperature range (-40°C to 125°C) compared to the original part (-55°C to 125°C), requiring thermal environment verification before selection.

Texas Instruments parametric equivalents CD74HC237PWR and CD74HC137PWR maintain full electrical and thermal specifications with active product status. All recommended substitutes carry ROHS3 compliance, MSL 1 moisture sensitivity rating, and identical ECCN and HTSUS classifications as the original part.

Avoid NLV74HC138ADTR2G due to obsolete product status, and CD74HC137PWT and CD74HC237PWT due to discontinued status at DiGi Electronics, unless existing inventory is available for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can CD74HC238PWR directly replace CD74HC238PWT in existing designs?

A: Yes. Both parts share identical electrical specifications (5.2 mA output current, 2V to 6V supply, -55°C to 125°C operating range) and 16-TSSOP package. The difference is packaging format: PWR is Cut Tape & Digi-Reel, while PWT is Tape & Reel. Circuit performance is equivalent.

Q: What is the difference between 74HC238, 74HC237, and 74HC138 base products?

A: All three are 1 x 3:8 decoder/demultiplexer devices with identical electrical performance and package specifications. Differences exist in internal logic implementation and pin configuration for enable/disable functions. Verify datasheet pin assignments before substitution.

Q: Is the Nexperia 74HC238PW,118 suitable for the full -55°C to 125°C temperature range?

A: No. Nexperia parts operate from -40°C to 125°C, a narrower range than the original CD74HC238PWT (-55°C to 125°C). Use only if your application operates within -40°C to 125°C limits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original CD74HC238PWT specification.

Q: Can onsemi MC74HC138ADTR2G replace MC74HC238ADTR2G?

A: Both maintain identical electrical specifications and 16-TSSOP packaging. Verify internal logic and pin configuration differences in respective datasheets, as base product numbers (74HC138 vs. 74HC238) indicate different decoder variants.

Q: What is the inventory status for active alternatives?

A: CD74HC238PWR (17,896 pcs), MC74HC238ADTR2G (14,012 pcs), MC74HC138ADTR2G (16,617 pcs), and 74HC238PW,118 (7,077 pcs) are currently in stock as new original parts. Verify current availability with your supplier before design commitment.

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