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AISC-1812H-390K-T Equivalent & Substitute Parts
Part Overview
The AISC-1812H-390K-T is a 39 µH unshielded drum core wirewound inductor manufactured by Abracon LLC, rated for 300 mA with a maximum DC resistance of 1.18Ohm. This component is packaged in the 1812 (4532 Metric) surface mount form factor and operates across the temperature range of -25°C to 85°C. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 39 µH |
| Current Rating | 300 mA |
| DC Resistance (Max) | 1.18Ohm |
| Package / Case | 1812 (4532 Metric) |
| Mounting Type | Surface Mount |
| Core Type | Ferrite, Unshielded, Drum Core |
| Operating Temperature | -25°C ~ 85°C |
| Frequency - Self Resonant | 11 MHz |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the AISC-1812H-390K-T is determined by the following critical parameters:
- Inductance Value: Must be 39 µH to maintain circuit function
- Package / Case: Must be 1812 (4532 Metric) for PCB compatibility
- Mounting Type: Must be Surface Mount
- Core Material & Type: Must be Ferrite, Unshielded, Drum Core
- Current Rating: Must support the application's maximum current requirement
- DC Resistance: Must not exceed the circuit's acceptable loss specifications
- Operating Temperature Range: Must encompass the application's thermal environment
- Compliance: Must maintain ROHS3 compliance for regulatory alignment
The LQH43NN390J03L from Murata Electronics meets these substitution criteria with identical inductance, package, mounting type, and core configuration. Variations in current rating, DC resistance, and operating temperature range are within acceptable engineering tolerances for equivalent component selection.
Parameter Comparison
| Parameter | AISC-1812H-390K-T (Abracon) | LQH43NN390J03L (Murata) |
|---|---|---|
| Inductance | 39 µH | 39 µH |
| Inductance Tolerance | ±10% | ±5% |
| Current Rating (Amps) | 300 mA | 240 mA |
| DC Resistance (Max) | 1.18Ohm | 1.4Ohm |
| Package / Case | 1812 (4532 Metric) | 1812 (4532 Metric) |
| Size / Dimension | 0.177" L x 0.126" W (4.50mm x 3.20mm) | 0.177" L x 0.126" W (4.50mm x 3.20mm) |
| Height - Seated (Max) | 0.110" (2.80mm) | 0.110" (2.80mm) |
| Mounting Type | Surface Mount | Surface Mount |
| Core Type | Ferrite, Unshielded, Drum Core | Ferrite, Unshielded, Drum Core |
| Frequency - Self Resonant | 11 MHz | 11 MHz |
| Operating Temperature | -25°C ~ 85°C | -40°C ~ 105°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
The LQH43NN390J03L is a direct functional equivalent for the obsolete AISC-1812H-390K-T based on matching inductance value, package form factor, core configuration, and compliance certifications. Both components are ROHS3 compliant and maintain MSL Level 1 rating.
When selecting the Murata substitute, verify that the application's maximum current requirement does not exceed 240 mA, as the LQH43NN390J03L is rated 60 mA lower than the original Abracon part. Additionally, confirm that the application's operating temperature range falls within -40°C to 105°C to utilize the extended thermal capability of the substitute. The slightly higher DC resistance of 1.4Ohm (versus 1.18Ohm) must be evaluated against circuit loss specifications.
Frequently Asked Questions (FAQ)
Q: Can the LQH43NN390J03L be used as a direct replacement for the AISC-1812H-390K-T?
A: Yes, provided the application's current requirement does not exceed 240 mA and the operating temperature range is within -40°C to 105°C. Both components share identical inductance, package dimensions, and core configuration.
Q: What is the impact of the 60 mA current rating difference?
A: The LQH43NN390J03L has a lower current rating (240 mA vs. 300 mA). If the circuit draws more than 240 mA, the substitute will not be suitable. Verify actual circuit current draw before substitution.
Q: Does the higher DC resistance of the Murata part affect circuit performance?
A: The LQH43NN390J03L has a maximum DC resistance of 1.4Ohm compared to 1.18Ohm for the Abracon part. This 0.22Ohm difference increases resistive losses. Evaluate whether this additional loss is acceptable for the application's power budget and thermal management.
Q: Are both parts compatible with the same PCB footprint?
A: Yes. Both components use the 1812 (4532 Metric) package with identical dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm) and maximum seated height (0.110", 2.80mm).
Q: What is the difference in inductance tolerance between the two parts?
A: The AISC-1812H-390K-T has ±10% tolerance, while the LQH43NN390J03L has ±5% tolerance. The Murata part offers tighter inductance accuracy.
Q: Are both parts RoHS compliant?
A: Yes, both the AISC-1812H-390K-T and LQH43NN390J03L are ROHS3 compliant and maintain MSL Level 1 (Unlimited) moisture sensitivity rating.
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