SCRH74B-221 Equivalent & Substitute Parts

Part Overview

The SCRH74B-221 is a 220 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 360 mA continuous current with a maximum DC resistance of 1.17Ohm. This component is designed for applications requiring fixed inductance in compact form factors with electromagnetic shielding. The part maintains Active product status and is RoHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining compatibility with the application's thermal and mechanical constraints.

Key Parameters

Parameter	Value	Unit
Inductance	220	µH
Inductance Tolerance	±20%	-
Current Rating	360	mA
Current - Saturation (Isat)	360	mA
DC Resistance (DCR)	1.17	Ohm Max
Shielding	Shielded	-
Operating Temperature Range	-40°C to 125°C	-
Mounting Type	Surface Mount	-
Package / Case	Nonstandard	-
Size / Dimension	7.80 x 7.80	mm
Height - Seated (Max)	4.50	mm
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the SCRH74B-221 is determined by strict equivalence across the following critical parameters:

Inductance Value: 220 µH at 1 kHz test frequency with ±20% tolerance
DC Resistance: 1.17Ohm maximum
Shielding: Shielded construction required
Mounting Type: Surface mount configuration
Operating Temperature: Minimum range of -40°C to 125°C
RoHS Compliance: ROHS3 Compliant status

The substitute part SPD74R-224M meets these core electrical specifications. While the substitute exhibits a higher current rating (600 mA versus 360 mA) and slightly different physical dimensions, these parameters represent improvements or acceptable variations that do not compromise functionality in applications designed for the original part's specifications. The substitute maintains identical inductance, tolerance, DC resistance, shielding, and compliance certifications.

Parameter Comparison

Parameter	SCRH74B-221	SPD74R-224M	Match Status
Manufacturer	Signal Transformer	API Delevan Inc.	Different
Inductance	220 µH	220 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating (Amps)	360 mA	600 mA	Substitute Higher
Current - Saturation (Isat)	360 mA	600 mA	Substitute Higher
DC Resistance (DCR)	1.17 Ohm Max	1.17 Ohm Max	Equivalent
Shielding	Shielded	Shielded	Equivalent
Operating Temperature Range	-40°C to 125°C	-55°C to 125°C	Substitute Wider
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	Nonstandard	Nonstandard	Equivalent
Size / Dimension	7.80 x 7.80 mm	7.30 x 7.30 mm	Substitute Smaller
Height - Seated (Max)	4.50 mm	4.70 mm	Substitute Taller
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

The SPD74R-224M qualifies as a direct substitute for the SCRH74B-221 based on electrical parameter equivalence. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for modern electronics manufacturing. The substitute part's higher current rating (600 mA saturation versus 360 mA) and extended lower operating temperature limit (-55°C versus -40°C) represent parameter enhancements that do not introduce incompatibility. The substitute's slightly reduced footprint (7.30 x 7.30 mm versus 7.80 x 7.80 mm) and marginally increased height (4.70 mm versus 4.50 mm) require verification against specific PCB layout constraints and available board space. Both parts are Active status products with unlimited moisture sensitivity rating, ensuring consistent supply chain availability and handling requirements.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match for substitution? A: The inductance value (220 µH), inductance tolerance (±20%), DC resistance (1.17Ohm maximum), and shielding type (shielded) must remain equivalent. Current rating and operating temperature range may exceed the original part's specifications without compromising compatibility.

Q: Can the SPD74R-224M be used in place of the SCRH74B-221 in all applications? A: The SPD74R-224M is electrically equivalent for applications designed within the SCRH74B-221's current rating of 360 mA. Physical dimensions differ slightly; PCB layout must accommodate the substitute's 7.30 x 7.30 mm footprint and 4.70 mm maximum height.

Q: Are there compliance or certification differences between these parts? A: Both parts maintain identical RoHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating. No compliance barriers exist for substitution.

Q: What is the significance of the higher current rating on the substitute part? A: The SPD74R-224M's 600 mA saturation current exceeds the SCRH74B-221's 360 mA rating. This represents a design margin improvement and does not create incompatibility when the application operates within the original part's current specifications.

Q: How do the physical dimensions affect substitution? A: The substitute is slightly smaller in footprint (7.30 x 7.30 mm versus 7.80 x 7.80 mm) but taller (4.70 mm versus 4.50 mm). PCB layout and component clearance must be verified to ensure the substitute fits within available space constraints.

Q: What is the operating temperature range difference? A: The SPD74R-224M operates from -55°C to 125°C, compared to the SCRH74B-221's -40°C to 125°C range. The substitute provides extended low-temperature performance, beneficial for applications requiring operation below -40°C.

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