SCRH127/LD-100 Equivalent & Substitute Parts

Part Overview

The SCRH127/LD-100 is a 10 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 6.21 A continuous current with a maximum DC resistance of 19.5 mOhm. This component is classified as Active product status and is currently in stock with 875 pieces available. The part is packaged in Tape & Reel format with nonstandard case dimensions of 12.50mm × 12.50mm and a seated height of 8.00mm.

Substitute parts become necessary when the original component experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings. The substitute parts listed maintain the core electrical specifications of 10 µH inductance at ±20% tolerance and shielded construction while operating within compatible current and temperature ranges.

Substiute Parts

SCRH127/LD-100

Signal TransformerIn Stock: 903SCRH127/LD-100 Datasheet

Current PartRFQ

CDRH127NP-100MC

Sumida America Components Inc.In Stock: 23193CDRH127NP-100MC Datasheet

MFR RecommendedRFQ

SLF12575T-100M5R4-H

TDK CorporationIn Stock: 2739SLF12575T-100M5R4-H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH127/LD-100 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Inductance value of 10 µH at ±20% tolerance
• Shielded construction to maintain electromagnetic isolation
• DC resistance within acceptable operating limits for thermal management
• Current rating sufficient for the application circuit

Mechanical Compatibility Criteria:

• Surface mount mounting type
• Package footprint compatibility (12.00mm to 12.50mm dimensions acceptable)
• Seated height within 8.00mm maximum constraint
• Nonstandard case package classification

Environmental & Compliance Criteria:

• Operating temperature range overlap with -40°C to 125°C specification
• RoHS3 compliance certification
• Moisture Sensitivity Level 1 rating
• REACH Unaffected status

The two substitute parts listed—CDRH127NP-100MC (Sumida) and SLF12575T-100M5R4-H (TDK)—meet these substitution criteria while presenting trade-offs in current rating, DC resistance, and product lifecycle status that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

CDRH127NP-100MC (Sumida America Components Inc.): This substitute maintains Active product status and full RoHS3 compliance. The part exhibits a 0.5mm reduction in package length (12.00mm vs. 12.50mm) and identical seated height. The current rating of 5.4 A represents a 13% reduction from the original specification, and DC resistance increases to 21.6 mOhm. The operating temperature maximum is limited to 100°C, reducing the upper thermal envelope by 25°C. This substitute is suitable for applications where current demand does not exceed 5.4 A and maximum ambient temperature remains below 100°C. Packaging is provided in Cut Tape and Digi-Reel format with significantly higher inventory availability (23,083 pieces).

SLF12575T-100M5R4-H (TDK Corporation): This substitute carries a "Not For New Designs" product status designation, indicating TDK has discontinued active development and support for this component line. However, it maintains full RoHS3 compliance and AEC-Q200 automotive qualification. The part features a ferrite drum core wirewound construction with DC resistance of 18.72 mOhm (the lowest among the three options) and current saturation of 5.5 A. Operating temperature range matches the original specification (-40°C to 125°C). Package dimensions are identical to the original (12.50mm × 12.50mm) with a slightly reduced seated height of 7.85mm. This substitute should be selected only when the superior DC resistance performance justifies acceptance of the discontinued product status, and only if current requirements do not exceed 5.4 A.

Frequently Asked Questions (FAQ)

Q: Can CDRH127NP-100MC be used as a direct replacement for SCRH127/LD-100 in all applications?

A: The CDRH127NP-100MC is mechanically compatible and maintains the same inductance and tolerance specifications. However, the reduced current rating (5.4 A vs. 6.21 A) and lower maximum operating temperature (100°C vs. 125°C) require verification that your application does not exceed these limits. The increased DC resistance (21.6 mOhm vs. 19.5 mOhm) will result in higher power dissipation at rated current.

Q: Why is SLF12575T-100M5R4-H marked "Not For New Designs"?

A: This designation indicates that TDK has transitioned this product to end-of-life status and is no longer recommending it for new circuit designs. While existing inventory may be available, long-term supply cannot be guaranteed. This part should only be considered for legacy system maintenance or when its specific performance characteristics (lower DC resistance, AEC-Q200 rating) are critical to the application.

Q: Are there any PCB layout considerations when substituting between these parts?

A: The CDRH127NP-100MC has a slightly smaller footprint (12.00mm vs. 12.50mm), which may allow placement in tighter board areas but requires verification that your PCB layout accommodates the smaller pad pattern. The SLF12575T-100M5R4-H matches the original footprint exactly. All three parts maintain identical seated height specifications within 0.15mm, so vertical clearance is not a differentiating factor.

Q: What is the impact of increased DC resistance in the Sumida substitute?

A: The CDRH127NP-100MC exhibits 21.6 mOhm maximum DC resistance compared to 19.5 mOhm in the original. At the substitute's rated current of 5.4 A, this results in approximately 0.63 watts of power dissipation (I²R loss), compared to 0.57 watts in the original at the same current. Thermal management and PCB copper area for heat dissipation should be evaluated accordingly.

Q: Can I use these substitutes interchangeably in the same design?

A: No. The three parts have different electrical and thermal characteristics. Selection must be based on your specific application's current requirements, maximum operating temperature, and thermal dissipation budget. The CDRH127NP-100MC is recommended for applications operating below 100°C with currents not exceeding 5.4 A. The SLF12575T-100M5R4-H should only be considered when its lower DC resistance is essential and product discontinuation status is acceptable.