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MF72-003D9 Equivalent & Substitute Parts
Part Overview
The MF72-003D9 is an Inrush Current Limiter manufactured by Cantherm, rated at 3 Ohms with ±20% tolerance and a maximum steady-state current of 4 A. This thermistor-based component is designed to limit inrush current in power supply circuits and related applications. The part is currently Active in product status with ROHS3 compliance and full inventory availability. Substitute parts may be required due to lead time constraints, regional availability, or specific packaging requirements while maintaining equivalent electrical performance.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Resistance @ 25°C | 3 | Ohms |
| Tolerance | ±20% | % |
| Current - Steady State Max | 4 | A |
| Diameter | 0.433 | inches (11.00 mm) |
| Lead Spacing | 0.295 | inches (7.50 mm) |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the MF72-003D9 is determined by the following critical parameters:
Primary Electrical Equivalence Criteria:
- Resistance @ 25°C: 3 Ohms (exact match required)
- Tolerance: ±20% (exact match required)
- Current - Steady State Max: minimum 4 A (equal or greater acceptable)
Mechanical Compatibility Criteria:
- Lead Spacing: 0.295 inches (7.50 mm) preferred for direct PCB compatibility
- Diameter: tolerance range acceptable within manufacturing standards
Compliance Requirements:
- RoHS3 Compliant status (mandatory for equivalent substitution)
- ECCN and HTSUS classifications must align
The substitute parts listed below meet the primary electrical equivalence criteria. Mechanical variations in diameter and lead spacing are noted for engineering evaluation during component selection.
Parameter Comparison
| Parameter | MF72-003D9 (Main) | B57236S0309M000 | B57236S0309M051 |
|---|---|---|---|
| Manufacturer | Cantherm | EPCOS - TDK Electronics | EPCOS - TDK Electronics |
| Series | MF72 | S236 | S236 |
| Resistance @ 25°C | 3 Ohms | 3 Ohms | 3 Ohms |
| Tolerance | ±20% | ±20% | ±20% |
| Current - Steady State Max | 4 A | 5 A | 5 A |
| Diameter | 0.433" (11.00 mm) | 0.453" (11.50 mm) | 0.453" (11.50 mm) |
| Lead Spacing | 0.295" (7.50 mm) | 0.295" (7.50 mm) | 0.197" (5.00 mm) |
| Packaging | Bulk | Bulk | Cut Tape (CT) |
| Product Status | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Affected |
| Approval Agency | — | — | CQC, IEC, UL, VDE |
Engineering Selection Recommendations
B57236S0309M000 Selection Criteria: This substitute part matches the MF72-003D9 in all primary electrical parameters (3 Ohms, ±20% tolerance) and maintains identical lead spacing (0.295 inches). The steady-state current rating is 5 A, exceeding the main part's 4 A specification. Diameter increases from 11.00 mm to 11.50 mm. Both parts are Active status with ROHS3 compliance. This part is available in Bulk packaging with significantly higher inventory (14,842 Pcs).
B57236S0309M051 Selection Criteria: This substitute part matches the MF72-003D9 in all primary electrical parameters (3 Ohms, ±20% tolerance) and provides a 5 A steady-state current rating. Lead spacing differs at 0.197 inches (5.00 mm) versus the main part's 0.295 inches, requiring PCB layout verification. Diameter is 11.50 mm. This part carries additional certifications (CQC, IEC, UL, VDE) and is available in Cut Tape packaging. REACH Status is listed as Affected, requiring compliance verification in regulated markets.
Selection Logic:
- For direct PCB compatibility without layout modification: B57236S0309M000
- For applications requiring additional agency certifications: B57236S0309M051
- For REACH-sensitive applications: B57236S0309M000
Frequently Asked Questions (FAQ)
Q: Can B57236S0309M000 replace MF72-003D9 without PCB modification?
A: Yes. The B57236S0309M000 maintains identical lead spacing (0.295 inches / 7.50 mm) and electrical specifications (3 Ohms, ±20%). The diameter increase from 11.00 mm to 11.50 mm is within acceptable mechanical tolerance for standard PCB mounting.
Q: What is the impact of the lead spacing difference in B57236S0309M051?
A: The B57236S0309M051 has lead spacing of 0.197 inches (5.00 mm) compared to the MF72-003D9's 0.295 inches (7.50 mm). This requires PCB layout verification and may necessitate design modification for direct substitution.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. Both B57236S0309M000 and B57236S0309M051 are ROHS3 Compliant, matching the main part's compliance status.
Q: What is the difference in REACH status between the substitutes?
A: B57236S0309M000 is REACH Unaffected, identical to the MF72-003D9. B57236S0309M051 is REACH Affected, requiring compliance verification for applications in regulated markets.
Q: Do the substitute parts have higher current ratings?
A: Yes. Both B57236S0309M000 and B57236S0309M051 are rated for 5 A steady-state current, compared to the MF72-003D9's 4 A rating. This provides additional margin in applications operating at or near the main part's current limit.
Q: Which substitute has better availability?
A: B57236S0309M000 has significantly higher inventory (14,842 Pcs) compared to B57236S0309M051 (3,283 Pcs) and the main part MF72-003D9 (916 Pcs).
Q: What certifications does B57236S0309M051 carry?
A: B57236S0309M051 is certified by CQC, IEC, UL, and VDE, providing additional agency approvals beyond the main part and the other substitute.
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