SCRH125B-180 Equivalent & Substitute Parts

Part Overview

The SCRH125B-180 is a 18 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 4.22 A continuous current with a maximum DC resistance of 38mOhm. This component is designed for applications requiring fixed inductance in compact form factors with electromagnetic shielding. The part is Active status and ROHS3 compliant, suitable for modern electronic assemblies with strict environmental standards.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting mechanical and thermal requirements of the application.

Key Parameters

Parameter	Value	Unit
Inductance	18	µH
Inductance Tolerance	±20%	-
Current Rating	4.22	A
DC Resistance (Max)	38	mOhm
Saturation Current	3	A
Shielding	Shielded	-
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	-
Package Dimensions	12.50 x 12.50 x 6.20	mm
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH125B-180 is determined by the following critical parameters:

Inductance Value: Must be 18 µH with ±20% tolerance
Shielding Type: Must be shielded to maintain electromagnetic isolation
Mounting Configuration: Must be surface mount compatible
DC Resistance: Must not exceed 39.2mOhm to ensure acceptable power dissipation
Current Rating: Must support minimum 3.9 A continuous operation
Operating Temperature: Must support -40°C minimum; upper limit may vary by application
RoHS Compliance: Must maintain ROHS3 compliance status
Package Form Factor: Nonstandard package with similar footprint dimensions

The CDRH127NP-180MC from Sumida America Components Inc. meets all substitution criteria within these parameter boundaries.

Parameter Comparison

Parameter	SCRH125B-180 (Signal Transformer)	CDRH127NP-180MC (Sumida)	Compatibility
Inductance	18 µH	18 µH	Matched
Inductance Tolerance	±20%	±20%	Matched
Current Rating	4.22 A	3.9 A	Sumida rated lower; verify application requirements
DC Resistance (Max)	38 mOhm	39.2 mOhm	Within tolerance
Saturation Current	3 A	Not specified	Signal Transformer specified
Shielding	Shielded	Shielded	Matched
Operating Temperature (Min)	-40°C	-40°C	Matched
Operating Temperature (Max)	125°C	100°C	Signal Transformer rated higher
Mounting Type	Surface Mount	Surface Mount	Matched
Package Dimensions	12.50 x 12.50 x 6.20 mm	12.00 x 12.00 x 8.00 mm	Similar footprint; height difference noted
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Matched

Engineering Selection Recommendations

Both the SCRH125B-180 and CDRH127NP-180MC are Active status components with ROHS3 compliance and MSL Level 1 rating, indicating equivalent environmental qualification and supply chain viability.

Selection between these parts depends on application-specific constraints:

Current Capacity: The SCRH125B-180 provides 4.22 A rating versus 3.9 A for the CDRH127NP-180MC. Applications requiring sustained current above 3.9 A should retain the Signal Transformer part.
Temperature Operating Range: The SCRH125B-180 operates to 125°C maximum, while the CDRH127NP-180MC is rated to 100°C. Designs with thermal environments exceeding 100°C require the Signal Transformer part.
Physical Dimensions: The CDRH127NP-180MC has a taller profile (8.00 mm vs 6.20 mm seated height) with a slightly smaller footprint (12.00 x 12.00 mm vs 12.50 x 12.50 mm). PCB layout constraints may dictate part selection.
DC Resistance: Both parts exhibit comparable DC resistance within acceptable engineering tolerance (38 mOhm vs 39.2 mOhm maximum).

Frequently Asked Questions (FAQ)

Q: Can CDRH127NP-180MC replace SCRH125B-180 in all applications?

A: Substitution is valid only when application current requirements do not exceed 3.9 A and operating temperature remains below 100°C. If either parameter exceeds these limits, the SCRH125B-180 must be retained.

Q: What is the impact of the 1.8 mm height difference between these inductors?

A: The CDRH127NP-180MC is 1.8 mm taller when seated. PCB clearance and component stacking constraints must be evaluated. The footprint difference (12.50 mm vs 12.00 mm) is minimal and typically accommodated by standard PCB design rules.

Q: Are both parts suitable for high-reliability applications?

A: Both components carry ROHS3 compliance and MSL Level 1 rating, indicating equivalent environmental qualification. Product status is Active for both manufacturers, supporting long-term supply availability.

Q: How do the DC resistance values compare functionally?

A: The 1.2 mOhm difference (38 mOhm vs 39.2 mOhm) represents a 3.2% variance and is within normal manufacturing tolerance for this component class. Power dissipation impact is negligible in most applications.

Q: What should be verified before implementing CDRH127NP-180MC as a substitute?

A: Confirm that application current does not exceed 3.9 A continuous operation, maximum ambient temperature remains below 100°C, and PCB layout accommodates the 8.00 mm seated height. Electrical performance at 1 kHz test frequency is equivalent between both parts.

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