SRP4012-R22M Equivalent & Substitute Parts

Part Overview

The SRP4012-R22M is a 220 nH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 9 A continuous current with a maximum DC resistance of 9.3 mOhm. This component is designed for surface mount applications in nonstandard packaging. The part is currently obsolete, making identification of suitable substitute components essential for ongoing production support and design continuity.

Substiute Parts

SRP4012-R22M

Bourns Inc.In Stock: 765SRP4012-R22M Datasheet

Current PartRFQ

SRP4012TA-R22M

Bourns Inc.In Stock: 5271SRP4012TA-R22M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRP4012TA-R22M qualifies as a functional substitute based on the following critical parameters:

Matching Parameters:

• Inductance value: 220 nH (identical)
• Inductance tolerance: ±20% (identical)
• Shielding: Shielded (identical)
• Mounting type: Surface Mount (identical)
• Inductance test frequency: 100 kHz (identical)
• RoHS and REACH compliance: ROHS3 Compliant, REACH Unaffected (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)

Allowable Variations:

• Current rating: 8.5 A (substitute) vs. 9 A (original) — acceptable for applications requiring ≤8.5 A
• DC Resistance: 8 mOhm Max (substitute) vs. 9.3 mOhm Max (original) — lower resistance is acceptable
• Saturation current: 20 A (substitute) vs. 10 A (original) — higher saturation provides improved margin
• Core material: Carbonyl Powder (substitute) vs. Iron (original) — both are standard drum core materials
• Operating temperature: -40°C to 150°C (substitute) vs. -55°C to 125°C (original) — acceptable for most applications
• Package: 2-SMD (substitute) vs. Nonstandard (original) — standard package improves availability
• Product status: Active (substitute) vs. Obsolete (original) — active status ensures continued supply

Parameter Comparison

Engineering Selection Recommendations

The SRP4012TA-R22M is suitable as a substitute for the obsolete SRP4012-R22M in applications where the following conditions are met:

• Circuit design requires a maximum continuous current of 8.5 A or less
• Operating temperature range of -40°C to 150°C is acceptable for the application
• Standard 2-SMD package footprint is compatible with PCB layout
• Active product status and Tape & Reel packaging format provide supply chain continuity
• ROHS3 compliance and AEC-Q200 rating meet regulatory and automotive qualification requirements where applicable

The substitute part offers improved saturation current margin (20 A vs. 10 A) and lower DC resistance (8 mOhm vs. 9.3 mOhm), resulting in reduced power dissipation and enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the SRP4012TA-R22M replace the SRP4012-R22M in all applications?

A: Substitution is valid only when circuit current requirements do not exceed 8.5 A continuous. The original part is rated for 9 A; applications requiring the full 9 A rating require alternative solutions.

Q: What is the impact of the different core materials (Iron vs. Carbonyl Powder)?

A: Both materials are standard for drum core inductors. The carbonyl powder core in the substitute provides stable inductance across temperature and frequency ranges. Core material selection does not affect substitution validity when inductance value and tolerance are identical.

Q: Does the package change from Nonstandard to 2-SMD affect compatibility?

A: The 2-SMD package is a standard surface mount format. PCB footprint verification is required to confirm mechanical compatibility. The substitute's standard packaging improves availability and manufacturing efficiency.

Q: Is the lower DC resistance of the substitute part beneficial?

A: Lower DC resistance (8 mOhm vs. 9.3 mOhm) reduces resistive losses and power dissipation, resulting in improved efficiency and lower operating temperature. This is a favorable characteristic for substitution.

Q: What does the AEC-Q200 rating on the substitute part indicate?

A: AEC-Q200 certification indicates the part meets automotive-grade reliability standards. This certification is not present on the original part but does not prevent substitution; it indicates enhanced qualification for automotive applications.

Q: How does the higher saturation current (20 A vs. 10 A) affect circuit operation?

A: Higher saturation current provides greater margin before inductor saturation occurs. This improves circuit stability and reduces the risk of inductor performance degradation under transient current conditions.