SRP4020-1R2M Equivalent & Substitute Parts

Part Overview

The SRP4020-1R2M is a 1.2 µH shielded molded inductor rated for 5 A continuous current with a maximum DC resistance of 22 mOhm. Designed for surface mount applications, this component operates across the industrial temperature range of -55°C to 125°C. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Substiute Parts

SRP4020-1R2M

Bourns Inc.In Stock: 1115SRP4020-1R2M Datasheet

Current PartRFQ

SRP4020TA-1R2M

Bourns Inc.In Stock: 3450SRP4020TA-1R2M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRP4020TA-1R2M qualifies as a substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Inductance: 1.2 µH (identical)
• Inductance Tolerance: ±20% (identical)
• Shielding: Shielded (identical)
• Mounting Type: Surface Mount (identical)
• Inductance Test Frequency: 100 kHz (identical)
• RoHS3 Compliance: Both parts compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited) for both

Acceptable Variations:

• Current Rating: 4.8 A (SRP4020TA-1R2M) versus 5 A (SRP4020-1R2M) — the substitute maintains sufficient current capacity for applications designed within the 4.8 A threshold
• DC Resistance: 30 mOhm Max (SRP4020TA-1R2M) versus 22 mOhm Max (SRP4020-1R2M) — the increased resistance is within acceptable limits for equivalent functionality
• Operating Temperature: -40°C ~ 150°C (SRP4020TA-1R2M) versus -55°C ~ 125°C (SRP4020-1R2M) — the substitute provides extended upper temperature capability

Parameter Comparison

Engineering Selection Recommendations

The SRP4020TA-1R2M is the active equivalent for the obsolete SRP4020-1R2M. Both parts maintain ROHS3 compliance and identical inductance specifications at the 100 kHz test frequency. The substitute part is currently in active production status with 3392 units in stock, ensuring supply chain continuity.

Selection of the SRP4020TA-1R2M is appropriate for applications where the 4.8 A current rating satisfies circuit requirements. The increased saturation current (7.8 A versus 5 A) provides additional design margin. The higher DC resistance (30 mOhm versus 22 mOhm) introduces minimal impact on circuit performance for equivalent inductance applications.

Both parts share identical moisture sensitivity classification and RoHS compliance status, eliminating regulatory or environmental concerns in the substitution.

Frequently Asked Questions (FAQ)

Q: Can the SRP4020TA-1R2M directly replace the SRP4020-1R2M in existing designs?

A: Direct substitution is valid when circuit current requirements do not exceed 4.8 A. The inductance value and tolerance remain identical. Applications designed for the full 5 A rating of the original part require circuit analysis to confirm operation within the 4.8 A limit of the substitute.

Q: What is the impact of the increased DC resistance in the SRP4020TA-1R2M?

A: The DC resistance increases from 22 mOhm to 30 mOhm maximum. This 8 mOhm difference results in proportionally increased resistive losses. For a 5 A circuit, this represents approximately 0.2 mW additional power dissipation at maximum resistance. Circuit thermal analysis should confirm acceptability for the specific application.

Q: Are there packaging differences between these parts?

A: The SRP4020-1R2M uses nonstandard packaging, while the SRP4020TA-1R2M is supplied in 2-SMD tape and reel format. Physical dimensions are similar (4.80mm x 4.00mm versus 4.45mm x 4.06mm length and width), with identical seated height of 2.00mm maximum. PCB footprint compatibility requires verification against original design specifications.

Q: What is the temperature operating range difference?

A: The SRP4020-1R2M operates from -55°C to 125°C, while the SRP4020TA-1R2M operates from -40°C to 150°C. For applications requiring operation below -40°C, the original part specification must be maintained. For standard industrial temperature ranges, the substitute provides extended upper temperature capability.

Q: Are both parts RoHS compliant?

A: Yes. Both the SRP4020-1R2M and SRP4020TA-1R2M are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity classification, eliminating compliance concerns in the substitution.