CD74HC238PW Equivalent & Substitute Parts

Part Overview

The CD74HC238PW is a Decoder/Demultiplexer logic integrated circuit manufactured by Texas Instruments, featuring a 1 x 3:8 circuit configuration in a 16-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. The 74HC238 series decoder/demultiplexer is widely used in digital logic applications requiring address decoding and signal routing functions.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the CD74HC238PW is determined by strict equivalence across the following critical parameters: decoder/demultiplexer type, 1 x 3:8 circuit configuration, output current specifications (5.2mA high and low), single supply voltage operation within 2V to 6V range, surface mount 16-TSSOP package geometry, and compliance certifications (ROHS3, REACH Unaffected, EAR99). Parts are grouped into three categories based on product status and availability: Direct Manufacturer Substitutes (active production status), Manufacturer Recommended Alternatives (including automotive-qualified variants), and Parametric Equivalents (functionally compatible but with different lifecycle status).

Parameter Comparison

Part Number	Manufacturer	Product Status	Circuit Config	Output Current (mA)	Voltage Supply (V)	Temp Range (°C)	Package	Packaging Type
CD74HC238PW	Texas Instruments	Discontinued	1 x 3:8	5.2 / 5.2	2 ~ 6	-55 ~ 125	16-TSSOP	Tube
CD74HC238PWR	Texas Instruments	Active	1 x 3:8	5.2 / 5.2	2 ~ 6	-55 ~ 125	16-TSSOP	Cut Tape & Digi-Reel
MC74HC238ADTR2G	onsemi	Active	1 x 3:8	5.2 / 5.2	2 ~ 6	-55 ~ 125	16-TSSOP	Cut Tape & Digi-Reel
74HC238PW,118	Nexperia USA Inc.	Active	1 x 3:8	5.2 / 5.2	2 ~ 6	-40 ~ 125	16-TSSOP	Cut Tape & Digi-Reel
74HC238PW-Q100J	Nexperia USA Inc.	Active	1 x 3:8	5.2 / 5.2	2 ~ 6	-40 ~ 125	16-TSSOP	Tape & Reel
CD74HC137PW	Texas Instruments	Last Time Buy	1 x 3:8	5.2 / 5.2	2 ~ 6	-55 ~ 125	16-TSSOP	Tube
MC74HC238ADTG	onsemi	Obsolete	1 x 3:8	5.2 / 5.2	2 ~ 6	-55 ~ 125	16-TSSOP	Tube

Engineering Selection Recommendations

For active production and new designs, CD74HC238PWR (Texas Instruments, active status) and MC74HC238ADTR2G (onsemi, active status) are the primary direct substitutes, both maintaining full parameter equivalence with the discontinued CD74HC238PW and offering superior supply chain availability. The Nexperia USA Inc. variants 74HC238PW,118 and 74HC238PW-Q100J provide additional sourcing options with active product status; the Q100J variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade components. CD74HC137PW (Texas Instruments, Last Time Buy status) remains functionally equivalent but represents a declining availability option. MC74HC238ADTG (onsemi, Obsolete status) should not be selected for new designs due to obsolescence, though existing inventory may be available for legacy system support. All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and identical electrical performance specifications.

Frequently Asked Questions (FAQ)

Q: Can CD74HC238PWR directly replace CD74HC238PW in existing designs? A: Yes. CD74HC238PWR is a direct functional equivalent with identical electrical specifications, circuit configuration, and package geometry. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and active product status. No design modifications are required.

Q: What is the difference between the Nexperia variants 74HC238PW,118 and 74HC238PW-Q100J? A: Both are functionally equivalent Nexperia 74HC238 decoders with identical electrical performance. The primary differences are packaging format (74HC238PW,118 uses Cut Tape & Digi-Reel; 74HC238PW-Q100J uses Tape & Reel) and qualification level (74HC238PW-Q100J includes AEC-Q100 automotive qualification). Select 74HC238PW-Q100J for automotive applications requiring AEC-Q100 compliance.

Q: Are there temperature range differences between substitutes? A: Yes. CD74HC238PW, CD74HC238PWR, MC74HC238ADTR2G, CD74HC137PW, and MC74HC238ADTG all operate across -55°C to 125°C. The Nexperia variants (74HC238PW,118 and 74HC238PW-Q100J) operate across -40°C to 125°C. For applications requiring -55°C operation, select Texas Instruments or onsemi alternatives.

Q: Why is MC74HC238ADTG listed if it is obsolete? A: MC74HC238ADTG is included for reference and legacy system support only. Existing inventory may be available for applications requiring component replacement in fielded systems. For new designs and active production, select parts with Active or Last Time Buy status.

Q: Does package type affect electrical performance? A: No. Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging formats contain identical die and electrical specifications. Package selection is determined by manufacturing process requirements, inventory management, and supply chain logistics rather than functional performance.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original CD74HC238PW specifications.

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