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MF72-012D13 Inrush Current Limiter Equivalent & Substitute Parts
Part Overview
The MF72-012D13 is an inrush current limiter manufactured by Cantherm, designed for thermal protection in electrical circuits. This component operates at 12 Ohms ±20% with a maximum steady-state current rating of 3 A and a physical diameter of 0.610" (15.50mm). The part is currently in active production status with ROHS3 compliance and REACH unaffected classification.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. The availability of alternative sources ensures supply chain continuity and procurement flexibility for applications requiring this component specification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Resistance @ 25°C | 12 | Ohms |
| Tolerance | ±20% | % |
| Current - Steady State Max | 3 | A |
| Resistance @ Current | 316 | mOhms |
| Diameter | 0.610 | inches (15.50mm) |
| Lead Spacing | 0.295 | inches (7.50mm) |
| RoHS Status | ROHS3 Compliant | |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitute parts for the MF72-012D13 are identified based on the following critical parameters that determine functional equivalence:
Primary Matching Criteria:
- Resistance value: 12 Ohms
- Tolerance: ±20%
- Lead spacing: 0.295" (7.50mm)
- Compliance certifications: ROHS3 and REACH status
Secondary Consideration:
- Current rating: The substitute part B57211P0120M301 has a higher steady-state current rating of 4 A compared to the main part's 3 A specification. This represents an upgraded capability that maintains backward compatibility for applications within the original 3 A requirement.
Physical Compatibility:
- Diameter variation exists between the main part (0.610") and substitute (0.512"), which may affect mechanical fit in space-constrained applications but does not impact electrical performance.
Parameter Comparison
| Parameter | MF72-012D13 (Cantherm) | B57211P0120M301 (EPCOS - TDK Electronics) |
|---|---|---|
| Resistance @ 25°C | 12 Ohms | 12 Ohms |
| Tolerance | ±20% | ±20% |
| Current - Steady State Max | 3 A | 4 A |
| Resistance @ Current | 316 mOhms | 218 mOhms |
| Diameter | 0.610" (15.50mm) | 0.512" (13.00mm) |
| Lead Spacing | 0.295" (7.50mm) | 0.295" (7.50mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Product Status | Active | Active |
Engineering Selection Recommendations
Both the MF72-012D13 and B57211P0120M301 meet identical compliance requirements under ROHS3 and REACH regulations, confirming their suitability for regulated applications. Both components maintain active production status, ensuring long-term availability and supply chain stability.
The B57211P0120M301 substitute provides equivalent electrical performance at the specified 12 Ohm resistance with matching ±20% tolerance and identical lead spacing of 0.295" (7.50mm). The higher current rating of 4 A accommodates applications originally designed for the 3 A specification without performance degradation.
Selection between these parts should be based on mechanical fit requirements within the application enclosure. The MF72-012D13 features a larger diameter of 0.610", while the B57211P0120M301 measures 0.512" in diameter. Both are suitable for the same electrical circuit requirements.
Frequently Asked Questions (FAQ)
Q: Can B57211P0120M301 directly replace MF72-012D13 in existing applications?
A: Yes, the B57211P0120M301 provides electrical equivalence with matching 12 Ohm resistance, ±20% tolerance, and identical lead spacing. Mechanical fit must be verified due to diameter differences (0.610" versus 0.512").
Q: What is the significance of the different current ratings (3 A vs. 4 A)?
A: The B57211P0120M301 has a higher steady-state current rating, which represents an upgraded thermal capability. Applications designed for 3 A operation remain fully compatible with this substitute.
Q: Are both parts compliant with environmental regulations?
A: Both the MF72-012D13 and B57211P0120M301 are ROHS3 compliant and REACH unaffected, meeting current environmental standards for electronic components.
Q: Does the diameter difference affect electrical performance?
A: No. The diameter difference is a physical characteristic only and does not impact electrical resistance, tolerance, or current-handling capability. Mechanical fit in the application assembly must be evaluated separately.
Q: What is the difference in resistance at operating current between these parts?
A: The MF72-012D13 exhibits 316 mOhms at operating current, while the B57211P0120M301 exhibits 218 mOhms. Both values fall within acceptable operating parameters for inrush current limiting applications.
Q: Are both parts available in active production?
A: Yes, both components maintain active product status, ensuring continued availability and supply chain support.
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