SCRH74-820 Equivalent & Substitute Parts

Part Overview

The SCRH74-820 is a 82 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 610 mA continuous current with a maximum DC resistance of 430mOhm. This component is designed for applications requiring fixed inductance in compact nonstandard packages. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

SCRH74-820

Signal TransformerIn Stock: 1050SCRH74-820 Datasheet

Current PartRFQ

SRR0745A-820M

Bourns Inc.In Stock: 1926SRR0745A-820M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH74-820 is determined by the following critical parameters:

• Inductance Value: Must be 82 µH with ±20% tolerance
• Current Rating: Minimum 610 mA continuous current capability
• DC Resistance: Maximum 430mOhm to maintain circuit performance
• Shielding: Must be shielded to prevent electromagnetic interference
• Mounting Type: Surface mount configuration required
• Operating Temperature: Must support -40°C to 125°C range
• Compliance: RoHS3 compliance and MSL 1 rating required

The SRR0745A-820M from Bourns Inc. meets all substitution criteria with equivalent inductance, superior current rating (780 mA), lower DC resistance (400mOhm), and identical compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the SCRH74-820 and SRR0745A-820M are active production components with full RoHS3 compliance and MSL 1 ratings. The SRR0745A-820M provides enhanced performance margins with higher current saturation (900 mA versus 610 mA) and lower DC resistance (400mOhm versus 430mOhm), making it suitable for applications requiring additional thermal headroom or lower power dissipation. Both parts maintain identical operating temperature ranges and inductance test frequencies. Selection between these parts should be based on availability, lead time, and specific circuit margin requirements.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-820M directly replace the SCRH74-820 in existing designs?

A: Yes. Both parts share identical inductance values (82 µH ±20%), operating temperature ranges (-40 to 125°C), shielding characteristics, and surface mount configuration. The SRR0745A-820M provides superior current handling and lower DC resistance, making it electrically compatible and functionally superior.

Q: What are the physical dimension differences between these parts?

A: The SCRH74-820 measures 0.307" L x 0.307" W x 0.177" H (7.80mm x 7.80mm x 4.50mm). The SRR0745A-820M measures 0.287" L x 0.287" W x 0.185" H (7.30mm x 7.30mm x 4.70mm). Both use nonstandard packages; PCB layout verification is required before substitution.

Q: Are there compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. The SRR0745A-820M includes AEC-Q200 automotive qualification, which the SCRH74-820 does not specify.

Q: What is the impact of the lower DC resistance in the SRR0745A-820M?

A: Lower DC resistance (400mOhm versus 430mOhm) reduces power dissipation and heat generation in the inductor, improving circuit efficiency and thermal performance under continuous current operation.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Both parts are tested at 1 kHz inductance frequency. Self-resonant frequency data is not provided for either part. High-frequency performance must be verified through circuit simulation or testing.