SCRH124B-221 Equivalent & Substitute Parts

Part Overview

The SCRH124B-221 is a 220 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 950 mA continuous current with a maximum DC resistance of 700mOhm. This component is designed for applications requiring electromagnetic shielding in compact nonstandard packages. The part is Active status and ROHS3 compliant, suitable for industrial and commercial electronics requiring reliable inductance in the 220 µH range.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative electrical or mechanical characteristics within acceptable tolerance ranges.

Substiute Parts

SCRH124B-221

Signal TransformerIn Stock: 860SCRH124B-221 Datasheet

Current PartRFQ

DRA124-221-R

Eaton - Electronics DivisionIn Stock: 1019DRA124-221-R Datasheet

MFR RecommendedRFQ

UP2B-221-R

Eaton - Electronics DivisionIn Stock: 1967UP2B-221-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH124B-221 is determined by the following critical parameters:

Primary Substitution Criteria:

• Inductance value: 220 µH ±20% tolerance
• Current rating: minimum 950 mA continuous
• DC resistance: maximum 700mOhm
• Mounting type: Surface Mount
• Package dimensions: compatible with 12.50mm x 12.50mm footprint
• Operating temperature range: minimum -40°C ~ 125°C
• Compliance: ROHS3 Compliant

Secondary Considerations:

• Shielding type (shielded vs. unshielded) affects electromagnetic interference characteristics
• Saturation current ratings influence performance under transient conditions
• Height and seated dimensions must accommodate PCB layout constraints

The substitute parts listed below meet the primary inductance, current, and resistance specifications while maintaining surface mount compatibility and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

DRA124-221-R (Eaton - Electronics Division): This shielded wirewound inductor maintains electromagnetic shielding equivalent to the primary part. The current rating of 865 mA is lower than the SCRH124B-221 by 85 mA, requiring verification that application peak currents do not exceed this threshold. The DC resistance of 568mOhm is superior (lower) than the maximum specification, reducing power dissipation. The extended operating temperature range to 165°C provides additional thermal margin. AEC-Q200 automotive qualification is included. Height is reduced to 4.50mm, improving PCB density. This part is suitable for applications where shielding is required and current demands remain below 865 mA.

UP2B-221-R (Eaton - Electronics Division): This unshielded drum core wirewound inductor from the UNI-PAC™ series offers the lowest DC resistance at 671.7mOhm Max. The current rating of 773 mA is significantly lower than the primary part by 177 mA, restricting use to lower-current applications. The unshielded design eliminates electromagnetic containment, making this part unsuitable for noise-sensitive circuits. The operating temperature range is limited to -40°C ~ 85°C, reducing thermal capability compared to the primary part. Footprint dimensions differ (13.97mm x 10.41mm vs. 12.50mm x 12.50mm), requiring PCB layout verification. This part is applicable only when shielding is not required and current demands are below 773 mA.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and Active product status, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can DRA124-221-R replace SCRH124B-221 in all applications? A: DRA124-221-R is suitable when application current requirements do not exceed 865 mA continuous. Both parts are shielded with identical inductance values and compatible footprints. Verify that your circuit's maximum current demand remains below 865 mA before substitution.

Q: What is the primary difference between DRA124-221-R and UP2B-221-R? A: DRA124-221-R is shielded with a 865 mA current rating, while UP2B-221-R is unshielded with a 773 mA current rating. Shielding affects electromagnetic interference characteristics. Select based on whether EMI containment is required in your application.

Q: Is UP2B-221-R compatible with the SCRH124B-221 footprint? A: UP2B-221-R has different dimensions (13.97mm x 10.41mm vs. 12.50mm x 12.50mm) and greater height (6.00mm vs. 4.80mm). PCB layout verification is required before substitution.

Q: What is the impact of lower current ratings in substitute parts? A: DRA124-221-R (865 mA) and UP2B-221-R (773 mA) have lower continuous current ratings than SCRH124B-221 (950 mA). Substitution is valid only when your application's maximum sustained current remains below the substitute part's rating. Exceeding rated current causes inductor saturation and performance degradation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. SCRH124B-221, DRA124-221-R, and UP2B-221-R are all ROHS3 compliant with MSL Level 1 rating and Unlimited moisture sensitivity classification.

Q: How do DC resistance differences affect circuit performance? A: Lower DC resistance reduces power dissipation and heat generation. DRA124-221-R (568mOhm) dissipates less power than SCRH124B-221 (700mOhm Max). UP2B-221-R (671.7mOhm Max) is comparable to the primary part. In high-current applications, lower resistance is advantageous for thermal management.

Q: What is the significance of saturation current (Isat) ratings? A: Saturation current indicates the point at which inductor core saturation begins, causing inductance to degrade. DRA124-221-R has the highest Isat (1.363A), providing greater transient current handling. SCRH124B-221 (800mA) and UP2B-221-R (637mA) have lower saturation margins. Select based on transient current requirements in your application.