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CD74HC238MT Equivalent & Substitute Parts
Part Overview
The CD74HC238MT is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component implements a 1 x 3:8 decoder function with single supply voltage operation across the 2V to 6V range. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CD74HC238MT |
| Manufacturer | Texas Instruments |
| Type | Decoder/Demultiplexer |
| Circuit Configuration | 1 x 3:8 |
| Output Current (High/Low) | 5.2mA / 5.2mA |
| Supply Voltage Range | 2V to 6V |
| Operating Temperature Range | -55°C to 125°C |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Discontinued at DiGi Electronics |
Substitute Part Grouping Explanation
Substitution of the CD74HC238MT is determined by strict equivalence across the following parameters:
- Decoder/Demultiplexer type with 1 x 3:8 circuit configuration
- Output current specifications of 5.2mA for both high and low states
- Single supply voltage operation within 2V to 6V range
- Operating temperature range of -55°C to 125°C (or subset thereof)
- 16-SOIC surface mount package with 0.154" width (3.90mm)
- RoHS3 compliance and MSL Level 1 rating
Substitute parts are grouped into three categories: parametric equivalents from Texas Instruments with alternative packaging, manufacturer-recommended alternatives from NXP Semiconductors and onsemi, and parametric equivalents from STMicroelectronics. All listed substitutes maintain identical electrical specifications and package footprint compatibility.
Parameter Comparison
| Part Number | Manufacturer | Circuit | Output Current (mA) | Supply Voltage | Temp Range (°C) | Package | Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|
| CD74HC238MT | Texas Instruments | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Discontinued | Tape & Reel |
| CD74HC138M96 | Texas Instruments | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Cut Tape & Digi-Reel |
| CD74HC138MT | Texas Instruments | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Discontinued | Tape & Reel |
| CD74HC237M96 | Texas Instruments | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Tape & Reel |
| CD74HC238M96 | Texas Instruments | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Cut Tape & Digi-Reel |
| 74HC238D,653 | NXP Semiconductors | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -40 to 125 | 16-SOIC | Active | Standard |
| 74HC238D-Q100J | Nexperia USA Inc. | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -40 to 125 | 16-SOIC | Active | Tape & Reel |
| MC74HC238ADG | onsemi | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Tube |
| M74HC238RM13TR | STMicroelectronics | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Obsolete | Cut Tape & Digi-Reel |
| MC74HC138ADR2G | onsemi | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Cut Tape & Digi-Reel |
| MC74HC238ADR2G | onsemi | 1 x 3:8 | 5.2 / 5.2 | 2V - 6V | -55 to 125 | 16-SOIC | Active | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
For applications requiring the CD74HC238MT, the following selection criteria apply based on product status and compliance:
Primary Recommendation: CD74HC238M96 (Texas Instruments, Active status) provides direct parametric equivalence with identical electrical specifications and 16-SOIC package footprint. This part maintains full compatibility with the original design while offering active product status and improved supply availability.
Alternative from Active Inventory: MC74HC138ADR2G (onsemi, Active status) and MC74HC238ADR2G (onsemi, Active status) deliver equivalent electrical performance with full RoHS3 compliance and MSL Level 1 rating. Both parts support the complete -55°C to 125°C operating temperature range.
Automotive-Grade Option: 74HC238D-Q100J (Nexperia USA Inc., Active status) provides AEC-Q100 automotive qualification with identical circuit configuration and package specifications. Operating temperature range is -40°C to 125°C, suitable for automotive and industrial applications.
Extended Availability: CD74HC138M96 (Texas Instruments, Active status) and CD74HC237M96 (Texas Instruments, Active status) offer alternative base product numbers within the same 74HC decoder family, maintaining full electrical and mechanical compatibility.
All recommended substitutes maintain RoHS3 compliance, MSL Level 1 moisture sensitivity rating, and identical output current specifications. Package footprint compatibility is confirmed across all alternatives.
Frequently Asked Questions (FAQ)
Q: Can CD74HC238M96 replace CD74HC238MT directly? A: Yes. Both parts share identical electrical specifications (1 x 3:8 decoder, 5.2mA output current, 2V to 6V supply, -55°C to 125°C operating range) and 16-SOIC package footprint. The difference is packaging type: CD74HC238M96 uses Cut Tape & Digi-Reel while CD74HC238MT uses Tape & Reel. Electrical and mechanical compatibility is complete.
Q: What is the difference between CD74HC238MT and CD74HC138MT? A: Both parts are 1 x 3:8 decoders with identical electrical specifications and 16-SOIC packages. The base product numbers (74HC238 vs. 74HC138) indicate different internal logic configurations, but both function as equivalent decoders for this application category. Substitution is valid based on matching circuit configuration and electrical parameters.
Q: Are NXP and onsemi parts compatible with the original Texas Instruments design? A: Yes. 74HC238D,653 (NXP), 74HC238D-Q100J (Nexperia), MC74HC238ADG, and MC74HC138ADR2G (onsemi) all maintain the 1 x 3:8 decoder circuit, 5.2mA output current, 2V to 6V supply voltage, and 16-SOIC package. Operating temperature ranges are -55°C to 125°C (onsemi, STMicroelectronics) or -40°C to 125°C (NXP/Nexperia). Verify temperature requirements for your specific application.
Q: What does "Discontinued at DiGi Electronics" mean for the CD74HC238MT? A: The part is no longer actively stocked or distributed through DiGi Electronics. However, 1193 pieces remain in current inventory. For new designs or ongoing production, active-status alternatives such as CD74HC238M96, MC74HC238ADR2G, or 74HC238D-Q100J are recommended to ensure long-term supply continuity.
Q: Does packaging type (Tape & Reel vs. Cut Tape) affect electrical performance? A: No. Packaging type affects only handling, storage, and assembly processes. Electrical specifications, circuit configuration, and package footprint remain identical. Select based on your assembly equipment and procurement requirements.
Q: Are all listed substitutes RoHS3 compliant? A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original CD74HC238MT specifications.
Q: Can I use 74HC238D-Q100J in non-automotive applications? A: Yes. The AEC-Q100 automotive qualification indicates enhanced reliability testing and quality assurance. This part functions identically to non-qualified alternatives in standard industrial and commercial applications. Operating temperature range is -40°C to 125°C.
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