SCRH4D14R-120 Equivalent & Substitute Parts

Part Overview

The SCRH4D14R-120 is a 12 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 790 mA continuous current with a maximum DC resistance of 360 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Key Parameters

Parameter	Value
Inductance	12 µH
Inductance Tolerance	±30%
Current Rating	790 mA
Saturation Current (Isat)	500 mA
DC Resistance (DCR)	360 mOhm Max
Shielding	Shielded
Mounting Type	Surface Mount
Package	Nonstandard
Size	4.10mm x 4.10mm x 1.50mm
Operating Temperature	-40°C to 125°C
Inductance Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SCRH4D14R-120 is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Inductance value: 12 µH (primary functional requirement)
Inductance tolerance: ±30% maximum acceptable deviation
Current rating: minimum 790 mA continuous
DC resistance: maximum 360 mOhm
Saturation current: minimum 500 mA
Shielding: required (shielded configuration)
Test frequency: 100 kHz

Mechanical Compatibility Criteria:

Mounting type: Surface Mount
Package classification: Nonstandard
Physical dimensions: 4.10mm x 4.10mm footprint with 1.50mm maximum height
Temperature range: -40°C minimum operating temperature

Compliance Requirements:

RoHS3 compliance mandatory
MSL rating: 1 (Unlimited)

The CDRH3D14/LDNP-120NC from Sumida America Components Inc. meets these substitution criteria with equivalent inductance, superior current handling, and improved DC resistance characteristics.

Parameter Comparison

Parameter	SCRH4D14R-120 (Signal Transformer)	CDRH3D14/LDNP-120NC (Sumida)	Compatibility
Inductance	12 µH	12 µH	Equivalent
Inductance Tolerance	±30%	±25%	Substitute tighter tolerance
Current Rating (Amps)	790 mA	800 mA	Substitute exceeds requirement
Saturation Current (Isat)	500 mA	450 mA	Substitute below original
DC Resistance (DCR)	360 mOhm Max	270 mOhm Max	Substitute superior
Shielding	Shielded	Shielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Size / Dimension	4.10mm x 4.10mm	3.80mm x 3.80mm	Substitute smaller footprint
Height - Seated (Max)	1.50mm	1.50mm	Equivalent
Operating Temperature	-40°C to 125°C	-40°C to 105°C	Substitute reduced upper limit
Inductance Frequency - Test	100 kHz	100 kHz	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The CDRH3D14/LDNP-120NC qualifies as a direct substitute for the obsolete SCRH4D14R-120 based on the following factors:

Functional Equivalence: Both components provide 12 µH inductance at 100 kHz test frequency with shielded surface mount construction. The substitute maintains the same physical height (1.50mm) and mounting compatibility.

Performance Advantages: The CDRH3D14/LDNP-120NC offers superior DC resistance (270 mOhm vs. 360 mOhm maximum), resulting in lower power dissipation and improved thermal performance. Current rating of 800 mA exceeds the original 790 mA specification.

Compliance Status: Both components meet ROHS3 compliance and carry MSL rating 1 (Unlimited), ensuring equivalent handling and storage requirements. The substitute is actively manufactured by Sumida America Components Inc., providing long-term supply availability.

Design Considerations: The substitute features a smaller footprint (3.80mm x 3.80mm vs. 4.10mm x 4.10mm), which may require PCB layout verification. The operating temperature upper limit is reduced from 125°C to 105°C; applications requiring operation above 105°C must retain the original part or identify alternative solutions. Saturation current of 450 mA is lower than the original 500 mA specification and should be evaluated for peak current transient conditions.

Frequently Asked Questions (FAQ)

Q: Can the CDRH3D14/LDNP-120NC be used as a direct replacement on existing PCBs designed for the SCRH4D14R-120?

A: The substitute has a smaller footprint (3.80mm x 3.80mm vs. 4.10mm x 4.10mm). PCB layout verification is required to confirm pad compatibility and placement clearances. The identical 1.50mm height allows vertical clearance to remain unchanged.

Q: What is the impact of the lower saturation current (450 mA vs. 500 mA) in the substitute?

A: The saturation current specification defines the current level at which inductance begins to degrade. Applications with peak transient currents exceeding 450 mA should be analyzed to determine if the reduced saturation margin is acceptable for the circuit function.

Q: Does the reduced operating temperature range (105°C vs. 125°C maximum) affect suitability?

A: Applications operating continuously above 105°C ambient or with component junction temperatures exceeding 105°C require evaluation. If the original design margin depends on 125°C operation, alternative parts must be identified.

Q: Why is the DC resistance lower in the substitute part?

A: The CDRH3D14/LDNP-120NC uses ferrite core material and optimized winding design, resulting in 270 mOhm maximum DCR compared to 360 mOhm in the original. This represents improved efficiency and reduced thermal dissipation.

Q: Is the tighter inductance tolerance (±25% vs. ±30%) beneficial?

A: Tighter tolerance provides improved consistency across production batches and may reduce circuit tuning requirements in frequency-dependent applications. This is a performance advantage with no negative impact.

Q: What packaging format is available for the substitute?

A: The CDRH3D14/LDNP-120NC is supplied in Tape & Reel (TR) format, standard for automated assembly processes. Confirm reel specifications and quantity requirements with the supplier.

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