SCRH124-121 Equivalent & Substitute Parts

Part Overview

The SCRH124-121 is a 120 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 380mOhm and operates across the industrial temperature range of -40°C to 125°C. 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 and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

SCRH124-121

Signal TransformerIn Stock: 1086SCRH124-121 Datasheet

Current PartRFQ

DR124-121-R

Eaton - Electronics DivisionIn Stock: 745DR124-121-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The DR124-121-R from Eaton - Electronics Division qualifies as a direct substitute for the SCRH124-121 based on the following critical parameters:

Inductance equivalence: Both parts specify 120 µH at ±20% tolerance, measured at 100 kHz test frequency, ensuring functional interchangeability in circuit applications.

Current rating compatibility: The DR124-121-R provides 1.3 A continuous current rating, which exceeds the SCRH124-121 requirement of 1.23 A, allowing operation within the original design envelope.

DC resistance specification: The DR124-121-R maximum DCR of 373.4mOhm is lower than the SCRH124-121 specification of 380mOhm, providing improved electrical efficiency.

Mechanical compatibility: Both parts share identical surface mount package dimensions (12.50mm L x 12.50mm W x 4.50mm H maximum seated height) and nonstandard package classification, enabling direct PCB footprint compatibility.

Environmental and compliance alignment: Both parts operate across -40°C to 125°C temperature range, maintain ROHS3 compliance, and carry MSL 1 (Unlimited) moisture sensitivity rating.

Shielding configuration: Both inductors feature shielded construction, maintaining electromagnetic isolation characteristics required in the original design.

Parameter Comparison

Engineering Selection Recommendations

Both the SCRH124-121 and DR124-121-R maintain Active product status, ensuring continued availability and manufacturing support. Selection between these parts should be based on supply chain considerations and inventory availability rather than electrical performance differences, as the DR124-121-R provides equivalent or superior specifications across all critical parameters.

The DR124-121-R exhibits lower DC resistance (373.4mOhm versus 380mOhm), which reduces power dissipation in applications sensitive to thermal performance. The higher saturation current rating (1.65 A versus 1.1 A) provides additional design margin for transient current conditions.

Both parts carry ROHS3 compliance and MSL 1 moisture sensitivity classification, confirming suitability for standard manufacturing and storage environments without special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the DR124-121-R be used as a direct replacement for SCRH124-121 in existing designs?

A: Yes. Both inductors share identical inductance values (120 µH at ±20% tolerance), operating temperature ranges (-40 to 125°C), package dimensions (12.50 x 12.50 x 4.50 mm), and shielding configuration. The DR124-121-R provides equal or superior electrical performance across all specified parameters.

Q: What are the key differences between these two inductors?

A: The primary differences are manufacturer (Signal Transformer versus Eaton) and core material type (unspecified for SCRH124-121 versus ferrite for DR124-121-R). The DR124-121-R provides higher current rating (1.3 A versus 1.23 A) and lower DC resistance (373.4mOhm versus 380mOhm), both favorable characteristics for circuit performance.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance, carry MSL 1 moisture sensitivity rating, and operate within identical temperature specifications. Compliance profiles are equivalent.

Q: How do the saturation current ratings affect circuit design?

A: The SCRH124-121 saturates at 1.1 A while the DR124-121-R saturates at 1.65 A. For applications operating near the 1.23 A continuous rating of the SCRH124-121, the DR124-121-R provides additional margin before saturation occurs, reducing the risk of inductance collapse under transient conditions.

Q: Are the package footprints identical?

A: Yes. Both inductors use nonstandard surface mount packages with identical dimensions: 12.50mm length, 12.50mm width, and 4.50mm maximum seated height. PCB footprints are directly compatible.

Q: What is the significance of the ±20% inductance tolerance?

A: The ±20% tolerance applies to both parts and is measured at 100 kHz test frequency. This tolerance band defines the acceptable inductance range for circuit design calculations. Both parts meet this specification, ensuring functional equivalence in applications designed around this tolerance window.