SPD127R-394M Equivalent & Substitute Parts

Part Overview

The SPD127R-394M is a 390 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications requiring moderate current handling and low DC resistance characteristics. This component operates across the industrial temperature range of -55°C to 125°C and maintains active product status with full RoHS3 compliance.

Substitute parts become necessary when addressing supply chain constraints, lead time requirements, or when design specifications permit tolerance variations and operational parameter adjustments within acceptable engineering margins.

Substiute Parts

SPD127R-394M

API Delevan Inc.In Stock: 1212SPD127R-394M Datasheet

Current PartRFQ

SRR1208-391KL

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127R-394M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 390 µH (exact match required)
• Core type: Ferrite drum core, shielded configuration
• Mounting: Surface mount, nonstandard package
• Inductance test frequency: 1 kHz

Secondary Compatibility Parameters:

• Current rating: Substitute must equal or exceed 900 mA minimum
• DC resistance: Substitute must not exceed 750 mOhm maximum
• Inductance tolerance: Substitute tolerance must be ±20% or tighter
• Operating temperature: Substitute range must encompass -55°C to 125°C or be compatible with application requirements
• Compliance: RoHS3 and REACH status must match or exceed original specification

The SRR1208-391KL from Bourns Inc. qualifies as a direct substitute based on matching inductance value, ferrite core construction, shielded design, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

SPD127R-394M Selection Criteria:

• Applications requiring the full -55°C to 125°C operating temperature range
• Designs with 900 mA continuous current requirements at maximum specification
• PCB layouts with strict height constraints (8.00 mm maximum)
• Footprint-critical designs requiring 12.00mm x 12.00mm package dimensions

SRR1208-391KL Selection Criteria:

• Applications operating within -40°C to 125°C temperature range
• Designs where current requirements do not exceed 800 mA continuous operation
• Applications benefiting from tighter inductance tolerance (±10% versus ±20%)
• Designs where lower DC resistance (670 mOhm) provides thermal or efficiency advantages
• PCB layouts accommodating 12.70mm x 12.70mm footprint and 8.50mm height

Both components maintain active product status, full RoHS3 compliance, and REACH unaffected designation, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SRR1208-391KL replace SPD127R-394M in all applications?

A: Substitution is valid only when application current requirements do not exceed 800 mA and operating temperature remains within -40°C to 125°C. The SPD127R-394M is required for applications demanding the full -55°C lower temperature limit or continuous 900 mA operation.

Q: What is the impact of the 100 mA current rating difference?

A: The SRR1208-391KL is rated for 800 mA continuous current versus 900 mA for the SPD127R-394M. Applications operating at or above 850 mA require the original SPD127R-394M specification. The SRR1208-391KL saturation current of 1.1 A exceeds the SPD127R-394M saturation current of 900 mA.

Q: Are the physical dimensions compatible?

A: The SRR1208-391KL is 0.70mm larger in length and width (12.70mm versus 12.00mm) and 0.50mm taller (8.50mm versus 8.00mm). PCB layout verification is required before substitution to confirm clearance and mounting compatibility.

Q: Does the tighter tolerance of SRR1208-391KL provide advantages?

A: The SRR1208-391KL offers ±10% inductance tolerance compared to ±20% for the SPD127R-394M. This tighter tolerance reduces inductance variation across production batches and may improve circuit performance in applications sensitive to inductance drift.

Q: What is the significance of lower DC resistance in the substitute?

A: The SRR1208-391KL DC resistance of 670 mOhm maximum is 80 mOhm lower than the SPD127R-394M maximum of 750 mOhm. Lower resistance reduces I²R losses and heat generation, benefiting thermal performance in current-limited applications.

Q: Are both parts equally available?

A: Both components maintain active product status. Inventory availability varies by distributor and time period. Current stock levels should be verified through component suppliers for specific procurement timelines.

Q: What compliance certifications apply to both parts?

A: Both SPD127R-394M and SRR1208-391KL are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8504.50.4000. Regulatory compliance is equivalent for both components.