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74ACT11139DR Equivalent & Substitute Parts
Part Overview
The 74ACT11139DR is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a 1 x 2:4 decoder with dual independent circuits, designed for signal routing and selection applications in digital systems. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical characteristics and package specifications to ensure direct compatibility in existing designs.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Functional Type | Decoder/Demultiplexer 1 x 2:4 |
| Independent Circuits | 2 |
| Output Current (High/Low) | 24mA / 24mA |
| Supply Voltage Range | 4.5V ~ 5.5V (Single Supply) |
| Operating Temperature Range | -40°C ~ 85°C |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Series | 74ACT |
Substitute Part Grouping Explanation
Substitute parts for the 74ACT11139DR are qualified based on strict parametric equivalence across the following criteria:
- Identical decoder/demultiplexer function (1 x 2:4 configuration)
- Matching independent circuit count (2 circuits)
- Identical output current specifications (24mA high, 24mA low)
- Matching supply voltage range (4.5V ~ 5.5V)
- Identical operating temperature range (-40°C ~ 85°C)
- Identical package and pinout (16-SOIC, 0.154" width)
- Same series classification (74ACT logic family)
All qualified substitutes listed below meet these parameters without exception. Substitution is valid only when all electrical and mechanical parameters align with the original specification.
Parameter Comparison
| Parameter | 74ACT11139DR (TI) | 74ACT139SCX (Fairchild) | MC74ACT139DR2G (onsemi) |
|---|---|---|---|
| Manufacturer | Texas Instruments | Fairchild Semiconductor | onsemi |
| Product Status | Obsolete | Active | Active |
| Decoder Configuration | 1 x 2:4 | 1 x 2:4 | 1 x 2:4 |
| Independent Circuits | 2 | 2 | 2 |
| Output Current (High) | 24mA | 24mA | 24mA |
| Output Current (Low) | 24mA | 24mA | 24mA |
| Supply Voltage | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package | 16-SOIC | 16-SOIC | 16-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Series | 74ACT | 74ACT | 74ACT |
| RoHS Status | ROHS3 Compliant | Not specified | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | Not specified | 1 (Unlimited) |
Engineering Selection Recommendations
Both substitute parts—74ACT139SCX (Fairchild Semiconductor) and MC74ACT139DR2G (onsemi)—are parametrically equivalent to the obsolete 74ACT11139DR and provide direct functional replacement.
The MC74ACT139DR2G is recommended as the primary substitute due to active product status, ROHS3 compliance certification, and MSL rating of 1 (Unlimited), which aligns with the original part's environmental specifications. This part is available in Cut Tape packaging with 2200 units in stock.
The 74ACT139SCX (Fairchild Semiconductor) serves as a secondary equivalent option, maintaining all critical electrical and mechanical parameters. This part is available in Bulk packaging with 18525 units in stock and active product status.
Both parts are classified under ECCN EAR99 and HTSUS 8542.39.0001, matching the original part's export and tariff classifications.
Frequently Asked Questions (FAQ)
Q: Can the 74ACT139SCX directly replace the 74ACT11139DR in existing designs?
A: Yes. The 74ACT139SCX meets all parametric requirements for direct substitution, including identical decoder configuration, output current ratings, supply voltage range, operating temperature range, and 16-SOIC package specifications. No circuit modifications are required.
Q: What is the difference between the two substitute parts?
A: Both substitutes are parametrically identical in electrical function and package. The primary differences are manufacturer (Fairchild vs. onsemi), product status (both active), packaging format (Bulk vs. Cut Tape), and available inventory levels. The MC74ACT139DR2G includes documented RoHS3 compliance and MSL rating matching the original part.
Q: Are there any compatibility concerns with the 16-SOIC package?
A: No. All three parts use identical 16-SOIC packaging (0.154", 3.90mm width) with surface mount configuration. PCB footprints and reflow profiles are directly compatible.
Q: Does supply voltage compatibility affect substitution?
A: No. All parts operate within the identical 4.5V ~ 5.5V single supply range. Substitution is valid across the entire specified voltage window.
Q: What is the significance of the 74ACT11139DR being obsolete?
A: Obsolete status indicates the original part is no longer manufactured by Texas Instruments. The listed substitutes maintain active production status, ensuring long-term availability and supply chain continuity for new designs and production runs.
Q: Are export classifications identical across all parts?
A: Yes. All three parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring consistent export and tariff treatment.
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