SPD127-394M Equivalent & Substitute Parts

Part Overview

The SPD127-394M is a 390 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 900 mA with a maximum DC resistance of 750mOhm. This component is classified as obsolete, making identification of suitable equivalent parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard 12.00mm x 12.00mm package.

Substiute Parts

SPD127-394M

API Delevan Inc.In Stock: 852SPD127-394M Datasheet

Current PartRFQ

HRSPD127-394M

API Delevan Inc.In Stock: 854HRSPD127-394M Datasheet

DirectRFQ

SRR1208-391KL

Bourns Inc.In Stock: 1848SRR1208-391KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-394M are identified based on the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 390 µH (exact match required)
• Core material: Ferrite shielded construction
• Mounting type: Surface Mount
• Current rating: Minimum 800 mA (SPD127-394M rated at 900 mA)
• DC resistance: Maximum 750mOhm preferred, up to 730mOhm acceptable for direct substitutes
• Package footprint: Nonstandard 12.00mm class dimensions
• Operating temperature: Minimum -40°C to 125°C overlap required

Substitute Classification:

• Direct Substitute (HRSPD127-394M): Same manufacturer, identical inductance and current rating, improved DCR specification, active product status
• Similar Substitute (SRR1208-391KL): Different manufacturer (Bourns Inc.), matching inductance, slightly lower current rating (800 mA vs 900 mA), superior DCR performance, tighter tolerance, active product status with RoHS3 compliance

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-394M (Direct Substitute - Recommended for Primary Selection)

The HRSPD127-394M is the preferred direct substitute. It is manufactured by the same supplier (API Delevan Inc.), maintains identical electrical specifications (390 µH, 900 mA, ±20% tolerance), and offers improved DC resistance performance (730mOhm vs 750mOhm). The part is currently in active production status with 814 units in stock. The extended operating temperature range (-55°C to 130°C) provides additional thermal margin. Height increase from 8.00mm to 9.02mm and footprint expansion from 12.00mm to 12.07mm are minimal and typically accommodated in standard PCB layouts. This part is available in Tape & Reel packaging for automated assembly.

SRR1208-391KL (Similar Substitute - Secondary Selection)

The SRR1208-391KL from Bourns Inc. is suitable where RoHS3 compliance is required or where superior DC resistance (670mOhm) and tighter inductance tolerance (±10%) provide design advantages. The current rating of 800 mA is 100 mA lower than the original specification; this substitute is appropriate only for applications where the actual operating current does not exceed 800 mA. The saturation current of 1.1A provides additional headroom. The footprint is slightly larger (12.70mm x 12.70mm), and the operating temperature minimum is -40°C rather than -55°C. This part is actively produced with 1813 units in stock and is available in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-394M be used as a direct replacement for SPD127-394M?

A: Yes. Both parts share identical inductance (390 µH), current rating (900 mA), and inductance tolerance (±20%). The HRSPD127-394M offers improved DC resistance specification and is in active production. Dimensional differences (12.07mm vs 12.00mm footprint, 9.02mm vs 8.00mm height) are within typical PCB design tolerances.

Q: What are the limitations of using SRR1208-391KL as a substitute?

A: The SRR1208-391KL has a maximum current rating of 800 mA, which is 100 mA lower than the SPD127-394M. Use this part only if your circuit operates at or below 800 mA. The operating temperature minimum is -40°C instead of -55°C. Footprint dimensions are larger (12.70mm x 12.70mm). These factors must be evaluated against your specific application requirements.

Q: Are there compliance differences between the substitute parts?

A: Yes. The SPD127-394M and HRSPD127-394M are both RoHS non-compliant. The SRR1208-391KL is ROHS3 compliant. If your application or market requires RoHS compliance, the SRR1208-391KL is the appropriate choice, subject to current rating verification.

Q: How do DC resistance differences affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. The HRSPD127-394M (730mOhm) and SRR1208-391KL (670mOhm) both offer improved performance compared to the original SPD127-394M (750mOhm). For applications sensitive to inductor losses, the SRR1208-391KL provides the lowest resistance option.

Q: Are the packaging formats compatible with existing assembly equipment?

A: Both substitute parts are supplied in Tape & Reel (TR) format, which is standard for automated surface mount assembly. Verify that your pick-and-place equipment supports the nonstandard package dimensions (12.00mm–12.70mm range) before production transition.

Q: What is the inductance tolerance impact when substituting parts?

A: The SPD127-394M and HRSPD127-394M both have ±20% tolerance. The SRR1208-391KL has ±10% tolerance, providing tighter inductance control. If your circuit requires inductance precision, the SRR1208-391KL offers superior performance.