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CD74HC138MT Equivalent & Substitute Parts
Part Overview
The CD74HC138MT is a decoder/demultiplexer logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a 1 x 3:8 decoder, converting three binary input lines into eight mutually exclusive output lines. The CD74HC138MT is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design and production requirements. Functionally equivalent alternatives are available from multiple manufacturers with identical electrical specifications and compatible packaging.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| 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 (standard) / -40°C to 125°C (automotive) / -40°C to 85°C (commercial) |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the CD74HC138MT is determined by the following critical parameters:
- Functional equivalence: All substitute parts maintain the identical 1 x 3:8 decoder/demultiplexer circuit configuration
- Electrical specifications: Output current (5.2mA high/low), supply voltage range (2V to 6V), and logic family (74HC series) must match
- Package compatibility: All substitutes use 16-SOIC surface mount packaging with identical pin configuration
- Compliance standards: RoHS3 compliance and MSL Level 1 rating are maintained across all alternatives
- Operating temperature: Substitutes are available in standard (-55°C to 125°C), automotive (-40°C to 125°C), and commercial (-40°C to 85°C) grades
Substitute parts are grouped by manufacturer and packaging format (Cut Tape, Tape & Reel, or Tube), with product status indicating active availability or discontinuation status.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Packaging | Package Type | Operating Temp | Output Current | Supply Voltage | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| CD74HC138MT | Texas Instruments | Discontinued at DiGi Electronics | Tape & Reel (TR) | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| CD74HC138M96 | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| CD74HC237M96 | Texas Instruments | Active | Tape & Reel (TR) | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| CD74HC238M96 | Texas Instruments | Active | Cut Tape (CT) & Digi-Reel® | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| CD74HC238MT | Texas Instruments | Discontinued at DiGi Electronics | Tape & Reel (TR) | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| MC74HC138ADR2G | onsemi | Active | Cut Tape (CT) & Digi-Reel® | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| 74HC138D,653 | Nexperia USA Inc. | Active | Cut Tape (CT) & Digi-Reel® | 16-SO | -40°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| 74HC138D-Q100,118 | Nexperia USA Inc. | Active | Tape & Reel (TR) | 16-SO | -40°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| 74HC138S16-13 | Diodes Incorporated | Active | Tape & Reel (TR) | 16-SO | -40°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| MC74HC138ADG | onsemi | Active | Tube | 16-SOIC | -55°C to 125°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
| MM74HC138M | onsemi | Active | Tube | 16-SOIC | -40°C to 85°C | 5.2mA / 5.2mA | 2V to 6V | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation for Active Inventory:
CD74HC138M96 (Texas Instruments) is the direct active equivalent with identical specifications to the discontinued CD74HC138MT. Both are manufactured by Texas Instruments, maintain the full -55°C to 125°C operating temperature range, and are available in 16-SOIC packaging. The primary difference is packaging format: CD74HC138M96 is supplied in Cut Tape & Digi-Reel format versus the original Tape & Reel format.
Alternative Active Sources:
MC74HC138ADR2G (onsemi) provides equivalent functionality with identical electrical specifications and full temperature range (-55°C to 125°C). This part is actively stocked with high inventory availability and maintains 16-SOIC packaging.
For Automotive Applications:
74HC138D-Q100,118 (Nexperia USA Inc.) is qualified to AEC-Q100 automotive standards with active product status. Operating temperature range is -40°C to 125°C, suitable for automotive environments.
For Commercial Temperature Range Applications:
MM74HC138M (onsemi) operates within -40°C to 85°C, appropriate for commercial-grade applications with reduced temperature requirements.
Packaging Considerations:
All substitutes maintain RoHS3 compliance and MSL Level 1 rating. Nexperia and Diodes Incorporated parts use 16-SO packaging, which is mechanically compatible with 16-SOIC but may require verification of PCB footprint compatibility. Texas Instruments and onsemi parts maintain exact 16-SOIC packaging.
Frequently Asked Questions (FAQ)
Q: Can I directly replace CD74HC138MT with CD74HC138M96?
A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, circuit configuration (1 x 3:8 decoder), output current (5.2mA), supply voltage range (2V to 6V), and operating temperature range (-55°C to 125°C). The difference is packaging format: CD74HC138M96 uses Cut Tape & Digi-Reel while CD74HC138MT uses Tape & Reel. Pin configuration and PCB footprint are identical.
Q: What is the difference between 16-SOIC and 16-SO packaging?
A: Both are surface mount packages with identical pin counts and spacing. 16-SOIC (Small Outline Integrated Circuit) and 16-SO (Small Outline) refer to the same physical package type with 0.154" width and 3.90mm body width. PCB footprints are compatible.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original CD74HC138MT specifications.
Q: Which substitute has the highest inventory availability?
A: CD74HC238M96 (Texas Instruments) has the highest reported inventory at 16,371 pieces. MC74HC138ADR2G (onsemi) has 18,498 pieces available. Both are actively stocked.
Q: Can I use MM74HC138M if my application requires -55°C operation?
A: No. MM74HC138M operates within -40°C to 85°C temperature range. For applications requiring -55°C operation, use CD74HC138M96, CD74HC237M96, CD74HC238M96, MC74HC138ADR2G, or MC74HC138ADG, all of which support -55°C to 125°C operation.
Q: What is the difference between CD74HC237M96 and CD74HC238M96?
A: Both are functionally equivalent 1 x 3:8 decoders/demultiplexers with identical electrical specifications. The base product numbers (74HC237 vs 74HC238) indicate different internal logic configurations, but both provide the same functional output. Selection depends on application-specific logic requirements and availability.
Q: Are automotive-qualified parts available?
A: Yes. 74HC138D-Q100,118 (Nexperia USA Inc.) is qualified to AEC-Q100 automotive standards with active product status and -40°C to 125°C operating range.
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