SPD127-393M Equivalent & Substitute Parts

Part Overview

The SPD127-393M is a 39 µH shielded drum core wirewound inductor rated for 2.8 A continuous current with 80mOhm maximum DC resistance, manufactured by API Delevan Inc. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters. Substitutes must preserve the 39 µH inductance value, shielded construction, surface mount compatibility, and operating temperature range to ensure seamless replacement in existing designs.

Substiute Parts

SPD127-393M

API Delevan Inc.In Stock: 1037SPD127-393M Datasheet

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HRSPD127-393M

API Delevan Inc.In Stock: 1080HRSPD127-393M Datasheet

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CDRH127/HPNP-390MC

Sumida America Components Inc.In Stock: 1044CDRH127/HPNP-390MC Datasheet

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SCRH125B-390

Signal TransformerIn Stock: 803SCRH125B-390 Datasheet

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SRR1208-390YL

Bourns Inc.In Stock: 2518SRR1208-390YL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility is determined by the following key electrical and mechanical parameters:

• Inductance Value: All substitutes maintain the 39 µH specification
• Inductance Tolerance: Acceptable range ±15% to ±20%
• Current Rating: Substitutes must support minimum 2.5 A; ratings up to 2.98 A are compatible
• DC Resistance: Maximum tolerance ±15% variance from 80mOhm specification (76mOhm to 83.8mOhm)
• Shielding: All substitutes are shielded construction
• Operating Temperature: Minimum range -40°C to 125°C required
• Mounting Type: Surface mount compatibility mandatory
• Physical Package: Nonstandard form factor (12.00mm to 12.70mm square footprint) with height variation acceptable (6.20mm to 9.02mm)

All four substitute parts meet these electrical and mechanical compatibility criteria for direct replacement in the SPD127-393M application.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-393M (API Delevan Inc.): Direct API Delevan equivalent with active product status. Maintains identical inductance tolerance and DC resistance specifications. Operating temperature extends to 130°C. Current rating reduction from 2.8 A to 2.6 A requires verification against circuit requirements. Available in Tape & Reel packaging.

CDRH127/HPNP-390MC (Sumida America Components Inc.): Highest current rating at 2.98 A with superior saturation current (3.92A). DC resistance increases marginally to 83.8mOhm. Operating temperature limited to 100°C. Suitable for applications requiring higher current capacity. Physically larger footprint (12.50mm) and identical height. Active product status.

SCRH125B-390 (Signal Transformer): Matches DC resistance and current rating specifications closely at 2.76 A. Lowest profile at 6.20mm height facilitates dense PCB layouts. ROHS3 compliance provides environmental compatibility. Operating temperature range -40°C to 125°C. Material core not specified. Active product status.

SRR1208-390YL (Bourns Inc.): Tightest inductance tolerance at ±15% improves performance consistency. Lowest DC resistance at 76mOhm minimizes power loss. Highest current saturation (3.4A) and self-resonant frequency (6MHz) data provided. ROHS3 compliance. Current rating of 2.5 A requires application verification. Largest physical footprint (12.70mm). Active product status with highest inventory (2496 Pcs).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower current rating than the original SPD127-393M?

A: Substitutes with lower current ratings (HRSPD127-393M at 2.6 A, SRR1208-390YL at 2.5 A) are electrically compatible only if circuit peak and RMS current demands remain below the substitute's rating. Thermal stress and component reliability degrade if current approaches rated maximum.

Q: Are physical dimension differences significant for PCB layout?

A: Yes. Footprint variations (12.00mm to 12.70mm) and height differences (6.20mm to 9.02mm) require PCB land pattern adjustment. SCRH125B-390 at 6.20mm height offers lowest profile for space-constrained applications. HRSPD127-393M and CDRH127/HPNP-390MC maintain 8.00mm height matching original design.

Q: What is the significance of DC resistance differences?

A: DC resistance directly impacts power dissipation and thermal performance. SRR1208-390YL at 76mOhm provides lowest loss. CDRH127/HPNP-390MC at 83.8mOhm increases dissipation by approximately 5%. Operating temperature and thermal management must account for resistance variations in high-current applications.

Q: Why do operating temperature ranges vary among substitutes?

A: Temperature ratings depend on inductor construction, insulation materials, and magnetic core characteristics. HRSPD127-393M supports -55°C to 130°C matching or exceeding the original SPD127-393M range. CDRH127/HPNP-390MC limitation to 100°C maximum requires thermal evaluation for extended temperature applications.

Q: What compliance differences exist between substitutes?

A: SRR1208-390YL and SCRH125B-390 are ROHS3 compliant, suitable for regulated environments. SPD127-393M and HRSPD127-393M are non-compliant. Environmental and regulatory requirements determine compliance necessity for final assembly and market distribution.

Q: How does inductance tolerance affect circuit performance?

A: All substitutes maintain acceptable tolerance (±15% to ±20%) within standard filter and matching network design margins. SRR1208-390YL tolerance of ±15% provides tighter inductance control for precision analog and RF circuits. ±20% tolerance suits broadband and switching applications.

Q: Are saturation current ratings critical for part selection?

A: Saturation current (Isat) indicates magnetic core flux density limits. Values provided for active substitutes establish absolute current boundaries beyond which inductance degrades. CDRH127/HPNP-390MC saturation at 3.92A and SRR1208-390YL at 3.4A permit higher transient currents than continuous ratings suggest.