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CD74AC138ME4 Equivalent & Substitute Parts
Part Overview
The CD74AC138ME4 is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in the 74AC series. This device implements a 1 x 3:8 decoder/demultiplexer function in a 16-SOIC surface mount package. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Base Product Number | 74AC138 |
| Circuit Configuration | 1 x 3:8 Decoder/Demultiplexer |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Output Current (High/Low) | 24mA / 24mA |
| Supply Voltage Range | 1.5V ~ 5.5V (Main Part) |
| Operating Temperature | -55°C ~ 125°C (Main Part) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the CD74AC138ME4 is determined by the following critical parameters:
Functional Equivalence: All substitute parts maintain the identical 1 x 3:8 decoder/demultiplexer circuit configuration and 74AC series logic family classification.
Package Compatibility: All substitutes use the 16-SOIC surface mount package with identical 0.154" (3.90mm) width, ensuring direct PCB footprint compatibility.
Electrical Performance: All substitutes provide 24mA output current capability (both high and low states) and operate as single supply devices.
Voltage and Temperature Ranges: Substitute parts operate within the following ranges:
- Supply Voltage: 2V ~ 6V (substitutes) versus 1.5V ~ 5.5V (main part)
- Operating Temperature: -40°C ~ 85°C (substitutes) versus -55°C ~ 125°C (main part)
The voltage and temperature ranges of substitute parts are narrower than the main part but remain suitable for standard industrial and commercial applications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage | Operating Temperature | Output Current (mA) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|
| CD74AC138ME4 | Texas Instruments | Discontinued | 1.5V ~ 5.5V | -55°C ~ 125°C | 24 / 24 | 16-SOIC | ROHS3 |
| CD74AC138M96 | Texas Instruments | Active | 1.5V ~ 5.5V | -55°C ~ 125°C | 24 / 24 | 16-SOIC | ROHS3 |
| MC74AC138DR2G | onsemi | Active | 2V ~ 6V | -40°C ~ 85°C | 24 / 24 | 16-SOIC | ROHS3 |
| 74AC138SC | Fairchild Semiconductor | Active | 2V ~ 6V | -40°C ~ 85°C | 24 / 24 | 16-SOIC | Not specified |
| 74AC138SCX | onsemi | Active | 2V ~ 6V | -40°C ~ 85°C | 24 / 24 | 16-SOIC | ROHS3 |
| MC74AC138DG | onsemi | Active | 2V ~ 6V | -40°C ~ 85°C | 24 / 24 | 16-SOIC | ROHS3 |
Engineering Selection Recommendations
Primary Substitute (Direct Replacement): CD74AC138M96 from Texas Instruments is the direct equivalent, maintaining identical electrical specifications and operating ranges as the discontinued CD74AC138ME4. This part is currently active and available in inventory.
Alternative Substitutes: The following parts provide functional equivalence with narrower operating ranges:
- MC74AC138DR2G (onsemi) - Active status, ROHS3 compliant
- 74AC138SCX (onsemi) - Active status, highest inventory availability, ROHS3 compliant
- MC74AC138DG (onsemi) - Active status, ROHS3 compliant
- 74AC138SC (Fairchild Semiconductor) - Active status
All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements.
Frequently Asked Questions (FAQ)
Q: Can CD74AC138M96 be used as a direct replacement for CD74AC138ME4?
A: Yes. CD74AC138M96 maintains identical electrical specifications, circuit configuration, package type, and operating ranges. Both parts are from Texas Instruments and implement the 74AC138 base product number.
Q: What are the key differences between the main part and onsemi substitutes?
A: The onsemi variants (MC74AC138DR2G, 74AC138SCX, MC74AC138DG) operate within a narrower supply voltage range (2V ~ 6V versus 1.5V ~ 5.5V) and narrower operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C). All other electrical parameters remain identical.
Q: Are all substitute parts in the same package?
A: Yes. All substitute parts use the 16-SOIC surface mount package with 0.154" (3.90mm) width, providing direct PCB footprint compatibility.
Q: Which substitute has the highest inventory availability?
A: 74AC138SCX from onsemi has 27,900 pieces in stock, the highest availability among all listed substitutes.
Q: Do all substitutes meet RoHS compliance requirements?
A: All substitutes except 74AC138SC from Fairchild Semiconductor are ROHS3 compliant. Compliance status for 74AC138SC was not specified in available data.
Q: What is the Moisture Sensitivity Level for substitute parts?
A: All substitute parts with specified MSL ratings are classified as MSL 1 (Unlimited), matching the main part specification.
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