SPD127-224M Equivalent & Substitute Parts Reference

Part Overview

The SPD127-224M is a 220 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.2 A continuous current with a maximum DC resistance of 390 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for applications requiring fixed inductance in compact nonstandard packages.

The SPD127-224M carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or redesign initiatives.

Substiute Parts

SPD127-224M

API Delevan Inc.In Stock: 913SPD127-224M Datasheet

Current PartRFQ

HRSPD127-224M

API Delevan Inc.In Stock: 926HRSPD127-224M Datasheet

DirectRFQ

SCRH127-221

Signal TransformerIn Stock: 1155SCRH127-221 Datasheet

SimilarRFQ

SRR1208-221KL

Bourns Inc.In Stock: 2776SRR1208-221KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127-224M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 220 µH (exact match required)
• Inductance tolerance: ±20% or tighter
• Shielding: Shielded configuration
• Mounting type: Surface Mount
• Core material: Ferrite

Secondary Compatibility Factors:

• Current rating: Equal to or greater than 1.2 A
• DC resistance: Equal to or less than 390 mOhm
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Package dimensions: Nonstandard, with physical compatibility to PCB layout

All three substitute parts meet the primary matching criteria. Variations in current rating, DC resistance, and temperature range are documented to enable informed selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-224M (API Delevan Inc.)

This direct manufacturer substitute from API Delevan Inc. provides the closest electrical and mechanical alignment to the SPD127-224M. It maintains the same inductance value, tolerance, and ferrite core material. The HRSPD127-224M offers improved current rating (1.25 A vs. 1.2 A) and lower DC resistance (351 mOhm vs. 390 mOhm), resulting in reduced power dissipation. The extended operating temperature range (-55°C to 130°C) provides additional thermal margin. However, this part remains RoHS non-compliant and carries active product status with Tape & Reel packaging availability.

SCRH127-221 (Signal Transformer)

The SCRH127-221 delivers the highest current rating (1.44 A) among all substitutes, making it suitable for applications requiring additional current headroom. It maintains identical DC resistance (390 mOhm) and inductance specifications. This part achieves ROHS3 compliance and carries active product status. The operating temperature range (-40°C to 125°C) does not extend to the lower -55°C limit of the original part. Physical dimensions are slightly larger (0.492" x 0.492" vs. 0.472" x 0.472"), requiring PCB layout verification.

SRR1208-221KL (Bourns Inc.)

The SRR1208-221KL offers the tightest inductance tolerance (±10% vs. ±20%), providing superior inductance accuracy. It achieves ROHS3 compliance and carries active product status. DC resistance (380 mOhm) is comparable to the original specification. The current rating (1.1 A) falls below the original 1.2 A specification and requires verification against application load requirements. The operating temperature range (-40°C to 125°C) does not extend to -55°C. This part includes documented Q factor (13 @ 796 kHz) and self-resonant frequency (2.5 MHz) specifications.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-224M directly replace SPD127-224M without circuit redesign?

A: Yes. Both parts share identical inductance (220 µH), tolerance (±20%), core material (ferrite), and shielding configuration. The HRSPD127-224M provides improved electrical performance with higher current rating and lower DC resistance. Physical dimensions are nearly identical (12.07 mm vs. 12.00 mm), and both use nonstandard surface mount packages. No circuit redesign is required.

Q: What is the impact of different inductance test frequencies between parts?

A: The SPD127-224M, SCRH127-221, and SRR1208-221KL are tested at 1 kHz, while HRSPD127-224M is tested at 10 kHz. Inductance values are specified at their respective test frequencies. For applications operating near 1 kHz, parts tested at 1 kHz provide direct correlation. The 10 kHz test frequency for HRSPD127-224M reflects its characterization at a higher frequency point and does not prevent substitution; however, inductance behavior across the full operating frequency range should be verified for frequency-sensitive applications.

Q: Why does SRR1208-221KL have a lower current rating than the original part?

A: The SRR1208-221KL is rated for 1.1 A continuous current, compared to 1.2 A for SPD127-224M. This represents a 91.7% current capacity relative to the original specification. Applications operating at or near the 1.2 A limit require verification that the reduced current rating does not cause saturation or thermal stress. The SRR1208-221KL's saturation current (1.45 A) provides margin above its continuous rating.

Q: Are there compliance differences between substitute parts?

A: Yes. The SPD127-224M and HRSPD127-224M are RoHS non-compliant. The SCRH127-221 and SRR1208-221KL achieve ROHS3 compliance. For applications subject to RoHS regulations or customer requirements, SCRH127-221 or SRR1208-221KL are required. All parts are REACH Unaffected or REACH compliant.

Q: What packaging formats are available for each substitute?

A: SPD127-224M is supplied in standard packaging (format not specified). HRSPD127-224M is available in Tape & Reel (TR) format. SCRH127-221 is available in Tape & Reel (TR) format. SRR1208-221KL is available in Cut Tape (CT) and Digi-Reel® format. Packaging selection depends on production volume and assembly equipment compatibility.

Q: Can SCRH127-221 be used in applications with -55°C lower temperature requirement?

A: No. The SCRH127-221 operating temperature range is -40°C to 125°C, which does not extend to -55°C. Applications requiring -55°C operation must use SPD127-224M or HRSPD127-224M. The SRR1208-221KL also operates only to -40°C minimum.

Q: How does inductance tolerance affect circuit performance?

A: SPD127-224M, HRSPD127-224M, and SCRH127-221 carry ±20% tolerance, while SRR1208-221KL carries ±10% tolerance. Tighter tolerance reduces inductance variation across production batches. For applications sensitive to inductance accuracy (resonant circuits, filters, impedance matching), the SRR1208-221KL provides superior consistency. For general-purpose applications, ±20% tolerance is typically acceptable.