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Bourns 9250-392 Equivalent & Substitute Parts
Part Overview
The Bourns 9250-392 is a 3.9 µH shielded drum core wirewound inductor rated for 450 mA with a maximum DC resistance of 400 mOhm. This through-hole axial component operates across -55°C to 105°C and features ferrite core construction with ±10% inductance tolerance.
The 9250-392 carries obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this inductance value and current rating specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 3.9 µH |
| Current Rating | 450 mA |
| DC Resistance (Max) | 400 mOhm |
| Tolerance | ±10% |
| Shielding | Shielded |
| Core Material | Ferrite |
| Mounting Type | Through Hole |
| Package | Axial |
| Size | 0.162" Dia x 0.410" L (4.11mm x 10.41mm) |
| Operating Temperature | -55°C to 105°C |
| Q @ 7.9 MHz | 44 |
| Self Resonant Frequency | 75 MHz |
Substitute Part Grouping Explanation
Substitute parts for the 9250-392 are qualified based on the following electrical and mechanical parameters:
- Inductance value: 3.9 µH ±10%
- Current rating: 450 mA minimum
- DC resistance: 400 mOhm maximum
- Shielding: Shielded configuration
- Mounting: Through-hole axial package
- Physical dimensions: 0.162" Dia x 0.410" L (4.11mm x 10.41mm)
- Q factor and self-resonant frequency characteristics
Substitutes are grouped into two categories: direct manufacturer alternatives from Bourns Inc. and cross-manufacturer equivalents from API Delevan Inc. All listed parts maintain electrical performance within the specified parameters.
Parameter Comparison
| Part Number | Manufacturer | Inductance | Current Rating | DCR (Max) | Core Type | Shielding | Operating Temp | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| 9250-392 | Bourns Inc. | 3.9 µH | 450 mA | 400 mOhm | Ferrite (Drum Core) | Shielded | -55°C to 105°C | Obsolete | RoHS Non-Compliant |
| 9250A-392-RC | Bourns Inc. | 3.9 µH | 450 mA | 400 mOhm | Ferrite (Molded) | Shielded | -55°C to 125°C | Active | RoHS3 Compliant |
| ER1641-392KM | API Delevan Inc. | 3.9 µH | 450 mA | 400 mOhm | Iron (Molded) | Shielded | -55°C to 105°C | Active | RoHS Non-Compliant |
| ER1641-392KP | API Delevan Inc. | 3.9 µH | 450 mA | 400 mOhm | Iron (Molded) | Shielded | -55°C to 105°C | Active | RoHS Non-Compliant |
| ER1641-392KR | API Delevan Inc. | 3.9 µH | 450 mA | 400 mOhm | Iron | Unshielded | -55°C to 105°C | Active | RoHS Non-Compliant |
Engineering Selection Recommendations
The 9250A-392-RC from Bourns Inc. is the primary direct replacement for the obsolete 9250-392. Both parts are manufactured by the same supplier, maintain identical electrical specifications, and share the same physical footprint. The 9250A-392-RC offers extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) and carries RoHS3 compliance, addressing modern regulatory requirements.
The ER1641-392KM and ER1641-392KP from API Delevan Inc. are functionally equivalent cross-manufacturer alternatives. Both maintain shielded configuration and all critical electrical parameters. These parts are available in active production status with established supply availability.
The ER1641-392KR differs in shielding configuration (unshielded versus shielded). This part is suitable only for applications where electromagnetic shielding is not a design requirement. The unshielded construction may introduce different EMI characteristics compared to the original shielded design.
Frequently Asked Questions (FAQ)
Q: Can the 9250A-392-RC directly replace the 9250-392 in existing designs?
A: Yes. The 9250A-392-RC maintains identical inductance, current rating, DC resistance, and physical dimensions. The extended operating temperature range and improved RoHS compliance make it a superior direct replacement.
Q: What is the difference between the ER1641-392KM and ER1641-392KP?
A: Both parts are electrically and mechanically identical. The difference lies in packaging: ER1641-392KM is supplied in Tape & Reel format, while ER1641-392KP is also supplied in Tape & Reel format. Packaging selection depends on assembly process requirements.
Q: Can ER1641-392KR be used as a substitute for the shielded 9250-392?
A: The ER1641-392KR maintains all electrical specifications but lacks shielding. Substitution is valid only if the application does not require electromagnetic shielding. Designs sensitive to EMI or requiring shielded performance must use shielded alternatives.
Q: Are there temperature rating differences between substitutes?
A: Yes. The 9250A-392-RC operates to 125°C, while the original 9250-392 and API Delevan ER1641 series operate to 105°C. For applications requiring extended high-temperature operation, the 9250A-392-RC provides additional margin.
Q: What are the core material differences?
A: The 9250-392 and 9250A-392-RC use ferrite cores. The ER1641 series uses iron cores. Both materials achieve the specified inductance and Q factor at 7.9 MHz. Core material selection affects frequency response characteristics and saturation behavior in specific application contexts.
Q: Which substitute offers the best regulatory compliance?
A: The 9250A-392-RC is RoHS3 compliant. The ER1641 series parts are RoHS non-compliant. For applications subject to RoHS regulations, the 9250A-392-RC is the required selection.
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