SCRH74-220 Equivalent & Substitute Parts

Part Overview

The SCRH74-220 is a 22 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring fixed inductance in compact form factors. This component is rated for 1.23 A continuous current with a maximum DC resistance of 110mOhm and operates across the industrial temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and performance optimization based on specific application requirements.

Key Parameters

Parameter	SCRH74-220
Inductance	22 µH
Inductance Tolerance	±20%
Current Rating (Amps)	1.23 A
Current - Saturation (Isat)	1.23 A
DC Resistance (DCR)	110mOhm Max
Shielding	Shielded
Operating Temperature	-40°C ~ 125°C
Inductance Frequency - Test	1 kHz
Mounting Type	Surface Mount
Size / Dimension	0.307" L x 0.307" W (7.80mm x 7.80mm)
Height - Seated (Max)	0.177" (4.50mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SCRH74-220 are qualified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Inductance value: 22 µH (exact match required)
Inductance tolerance: ±20% (matching tolerance band)
Shielding: Shielded configuration
Mounting type: Surface Mount
Inductance test frequency: 1 kHz
RoHS3 compliance and MSL Level 1 rating

Secondary Compatibility Parameters:

Current rating: Equal to or greater than 1.23 A
DC resistance: Equal to or less than 110mOhm Max
Operating temperature range: Must encompass or exceed -40°C ~ 125°C
Package classification: Nonstandard surface mount form factor

The identified substitutes SPD74R-223M and SRR0745A-220M meet all primary criteria and offer enhanced current handling capabilities with comparable or superior DC resistance characteristics.

Parameter Comparison

Parameter	SCRH74-220	SPD74R-223M	SRR0745A-220M
Manufacturer	Signal Transformer	API Delevan Inc.	Bourns Inc.
Series	SCRH74	SPD74R	SRR0745A
Inductance	22 µH	22 µH	22 µH
Inductance Tolerance	±20%	±20%	±20%
Current Rating (Amps)	1.23 A	2 A	1.65 A
Current - Saturation (Isat)	1.23 A	2 A	1.75 A
DC Resistance (DCR)	110mOhm Max	110mOhm Max	96mOhm Max
Shielding	Shielded	Shielded	Shielded
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Inductance Frequency - Test	1 kHz	1 kHz	1 kHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.307" L x 0.307" W (7.80mm x 7.80mm)	0.287" L x 0.287" W (7.30mm x 7.30mm)	0.287" L x 0.287" W (7.30mm x 7.30mm)
Height - Seated (Max)	0.177" (4.50mm)	0.185" (4.70mm)	0.185" (4.70mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SPD74R-223M (API Delevan Inc.): This substitute provides a 2 A current rating, representing a 63% increase over the SCRH74-220 baseline. DC resistance remains at 110mOhm Max, matching the original specification. The extended operating temperature range of -55°C to 125°C offers enhanced low-temperature performance. All compliance certifications (ROHS3, MSL Level 1) are maintained. Footprint dimensions are slightly reduced (7.30mm vs 7.80mm), which may require PCB layout verification.

SRR0745A-220M (Bourns Inc.): This substitute delivers a 1.65 A current rating with improved DC resistance of 96mOhm Max, representing a 13% reduction in resistive losses compared to the original part. The saturation current of 1.75 A provides adequate margin above the rated current. Operating temperature range matches the original specification (-40°C to 125°C). AEC-Q200 automotive qualification is included. Footprint dimensions are reduced to 7.30mm, consistent with SPD74R-223M.

Both substitutes maintain Active product status, full RoHS3 compliance, and MSL Level 1 rating. Selection between substitutes depends on current headroom requirements and thermal performance priorities.

Frequently Asked Questions (FAQ)

Q: Can SPD74R-223M or SRR0745A-220M be used as direct replacements for SCRH74-220?

A: Both parts qualify as functional substitutes based on matching inductance value (22 µH), tolerance (±20%), shielding configuration, and surface mount packaging. All three parts are tested at 1 kHz and maintain identical RoHS3 and MSL Level 1 compliance. PCB layout verification is required due to minor footprint dimension changes.

Q: What are the key differences between the two substitute options?

A: SPD74R-223M offers maximum current capacity (2 A) with extended low-temperature operation (-55°C). SRR0745A-220M provides superior DC resistance performance (96mOhm vs 110mOhm) and includes AEC-Q200 automotive qualification. Both maintain 110mOhm or better DC resistance specifications.

Q: Are there any size compatibility concerns when substituting?

A: The SCRH74-220 measures 7.80mm x 7.80mm with 4.50mm maximum height. Both substitutes measure 7.30mm x 7.30mm with 4.70mm maximum height. The reduced lateral dimensions and slightly increased height require PCB footprint and clearance verification before implementation.

Q: Do all three parts share the same inductance test frequency?

A: Yes. SCRH74-220, SPD74R-223M, and SRR0745A-220M are all tested at 1 kHz inductance frequency, ensuring consistent measurement methodology across all options.

Q: What compliance certifications apply to these substitutes?

A: All three parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. SRR0745A-220M additionally carries AEC-Q200 automotive qualification. REACH status is Unaffected for all parts, and ECCN classification is EAR99.

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