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MM74HC139M Equivalent & Substitute Parts
Part Overview
The MM74HC139M is a decoder/demultiplexer logic IC manufactured by onsemi, featuring a 1 x 2:4 circuit configuration in a 16-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The 74HC139 series decoder/demultiplexer is a standard logic function with multiple active and obsolete variants available from different manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MM74HC139M |
| Manufacturer | onsemi |
| Type | Decoder/Demultiplexer |
| Circuit Configuration | 1 x 2:4 |
| Independent Circuits | 2 |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Voltage Supply | 2V ~ 6V |
| Current - Output High, Low | 5.2mA, 5.2mA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the MM74HC139M is determined by the following critical parameters:
Functional Equivalence Requirements:
- Circuit configuration: 1 x 2:4 decoder/demultiplexer
- Independent circuits: 2
- Output current specifications: 5.2mA high, 5.2mA low
- Voltage supply range: 2V ~ 6V minimum compatibility
Package Compatibility:
- Primary package: 16-SOIC (0.154", 3.90mm Width)
- Alternative package: 16-SO (0.209", 5.30mm Width) - mechanically compatible with design layout verification
Electrical Operating Range:
- Minimum operating temperature: -40°C or lower
- Maximum operating temperature: 85°C or higher
Substitute parts meeting all functional and electrical parameters are considered direct equivalents. Parts with extended temperature ranges (-55°C to 125°C) or automotive qualifications (AEC-Q100) provide enhanced performance margins within the same functional specification.
Parameter Comparison
| Part Number | Manufacturer | Package | Voltage Supply | Output Current (High/Low) | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| MM74HC139M | onsemi | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 85°C | Obsolete | REACH Unaffected |
| MC74HC139ADG | onsemi | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Obsolete | ROHS3 Compliant |
| MC74HC139ADR2G | onsemi | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Active | ROHS3 Compliant |
| 74HC139D,653 | Nexperia USA Inc. | 16-SO (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 125°C | Active | ROHS3 Compliant |
| 74HC139D-Q100J | Nexperia USA Inc. | 16-SO (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 125°C | Active | ROHS3 Compliant |
| CD74HC139M96 | Texas Instruments | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -55°C ~ 125°C | Active | ROHS3 Compliant |
| SN74HC139DR | Texas Instruments | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74HC139DT | Texas Instruments | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 85°C | Discontinued at DiGi Electronics | ROHS3 Compliant |
| SN74HC139NSR | Texas Instruments | 16-SO (0.209") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SN74HC139QDRG4Q1 | Texas Instruments | 16-SOIC (0.154") | 2V ~ 6V | 5.2mA / 5.2mA | -40°C ~ 125°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation - Active Status with Extended Temperature Range: MC74HC139ADR2G (onsemi) or CD74HC139M96 (Texas Instruments) are preferred substitutes. Both are active products with ROHS3 compliance, extended operating temperature range (-55°C to 125°C), and identical 16-SOIC packaging. These parts provide design margin beyond the original MM74HC139M specifications.
Alternative - Matched Temperature Range: SN74HC139DR (Texas Instruments) maintains the original -40°C to 85°C operating range with active product status and ROHS3 compliance. This option is suitable for designs with temperature specifications identical to the original part.
Automotive-Grade Option: 74HC139D-Q100J (Nexperia) and SN74HC139QDRG4Q1 (Texas Instruments) are AEC-Q100 qualified automotive-grade parts. These are appropriate for applications requiring automotive qualification or enhanced reliability margins.
Package Consideration: SN74HC139NSR uses a 16-SO package with 0.209" width versus the standard 0.154" width. This part is mechanically compatible only if PCB layout accommodates the wider package footprint.
Frequently Asked Questions (FAQ)
Q: Can MM74HC139M be directly replaced with any 74HC139 variant? A: Direct replacement requires matching the 1 x 2:4 circuit configuration, 2 independent circuits, 5.2mA output current specification, 2V to 6V supply voltage range, and 16-SOIC package. All listed substitutes meet these criteria. Extended temperature range variants (-55°C to 125°C) are backward compatible with -40°C to 85°C designs.
Q: What is the difference between 16-SOIC (0.154") and 16-SO (0.209") packages? A: Both are 16-pin surface mount packages with identical pin pitch and electrical characteristics. The difference is package body width: 0.154" versus 0.209". Substitution between these packages requires PCB layout verification to confirm footprint compatibility. The 0.209" width package may not fit existing 0.154" footprints without design modification.
Q: Are ROHS3 compliant parts compatible with designs using non-compliant parts? A: Yes. ROHS3 compliance indicates the part meets environmental and material restrictions. Functionally and electrically, ROHS3 compliant parts are fully compatible with designs originally using non-compliant variants, provided all other electrical parameters match.
Q: What is the significance of AEC-Q100 qualification? A: AEC-Q100 qualification indicates the part meets automotive industry reliability and testing standards. These parts are suitable for automotive applications and provide enhanced reliability margins. They are fully compatible with non-automotive designs but may have higher cost.
Q: Why is MC74HC139ADG listed as obsolete if it is a substitute? A: MC74HC139ADG is obsolete from onsemi but remains available through inventory channels. MC74HC139ADR2G is the active onsemi equivalent. For new designs, MC74HC139ADR2G or active alternatives from other manufacturers are recommended.
Q: Can SN74HC139DT be used as a substitute despite being discontinued at DiGi Electronics? A: SN74HC139DT meets all functional and electrical parameters for substitution. However, as a discontinued product, long-term availability is not guaranteed. Active alternatives such as SN74HC139DR or MC74HC139ADR2G are recommended for new designs requiring sustained supply.
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