SPD74-273M Equivalent & Substitute Parts

Part Overview

The SPD74-273M is a 27 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.7 A with a maximum DC resistance of 150 mOhm. This component is classified as obsolete, making identification of active alternative parts necessary for ongoing system support, maintenance, and new design implementations where equivalent electrical and mechanical characteristics can be matched.

Key Parameters

Parameter	Specification
Inductance	27 µH
Inductance Tolerance	±20%
Current Rating	1.7 A
Current - Saturation (Isat)	1.7 A
DC Resistance (DCR)	150 mOhm Max
Shielding	Shielded
Material - Core	Ferrite
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
Package Type	Nonstandard
Size / Dimension	0.287" L x 0.287" W (7.30 mm x 7.30 mm)
Height - Seated (Max)	0.185" (4.70 mm)
Inductance Frequency - Test	1 kHz
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution of the SPD74-273M requires matching of core electrical parameters: inductance value of 27 µH, inductance tolerance of ±20%, shielding configuration, and surface mount packaging. The current rating and DC resistance must be evaluated within the application context. Parts identified as substitutes maintain the 27 µH inductance specification and shielded construction across ferrite or equivalent core materials.

Four substitute parts meet the fundamental inductance and shielding requirements:

HRSPD74-273M (API Delevan Inc.) - Active product status with matching inductance, shielded configuration, reduced current rating of 1.05 A, and lower DCR of 130 mOhm. Operating temperature range extends to 130°C.

SCB75C-270 (Signal Transformer) - Active product with matching inductance and DCR of 150 mOhm. Current rating of 1.62 A exceeds the original specification. RoHS3 compliant.

SCRH74-270 (Signal Transformer) - Active product with matching inductance, DCR of 150 mOhm, and current rating of 1.12 A. RoHS3 compliant, tape & reel packaging.

SCRH74B-270 (Signal Transformer) - Active product with identical electrical specifications to SCRH74-270. RoHS3 compliant, tape & reel packaging.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (A)	Isat (A)	DCR (mOhm Max)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
SPD74-273M	API Delevan Inc.	27 µH	1.7	1.7	150	-55 to 125	Obsolete	Non-compliant	Nonstandard
HRSPD74-273M	API Delevan Inc.	27 µH	1.05	—	130	-55 to 130	Active	Non-compliant	Tape & Reel
SCB75C-270	Signal Transformer	27 µH	1.62	1.02	150	-40 to 125	Active	RoHS3 Compliant	Nonstandard
SCRH74-270	Signal Transformer	27 µH	1.12	1.12	150	-40 to 125	Active	RoHS3 Compliant	Tape & Reel
SCRH74B-270	Signal Transformer	27 µH	1.12	1.12	150	-40 to 125	Active	RoHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

HRSPD74-273M is the closest functional equivalent as an active product from the original manufacturer API Delevan Inc. This part is directly compatible for applications where the reduced current rating of 1.05 A and lower DCR of 130 mOhm are acceptable. The extended operating temperature to 130°C provides additional thermal margin. RoHS non-compliance status remains consistent with the original design.

SCB75C-270 and SCRH74-270/SCRH74B-270 are viable alternatives with active product status and RoHS3 compliance. SCB75C-270 provides the highest current rating at 1.62 A, making it suitable for applications requiring margin above the original 1.7 A specification. SCRH74-270 and SCRH74B-270 offer identical electrical specifications with current rating of 1.12 A, appropriate for applications with lower current demands than the original design.

All substitute parts maintain the 27 µH inductance, shielded configuration, and surface mount construction necessary for form-fit-function equivalence. Selection should be based on current rating requirements for the specific application and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can HRSPD74-273M substitute for SPD74-273M in high-current applications? A: HRSPD74-273M has a reduced current rating of 1.05 A compared to the original 1.7 A specification. Substitution is valid only for applications where circuit current does not exceed 1.05 A.

Q: What is the primary advantage of SCB75C-270 over other substitutes? A: SCB75C-270 provides the highest current rating at 1.62 A and is RoHS3 compliant, making it suitable for applications requiring regulatory compliance and moderate current capacity, though still below the original 1.7 A rating.

Q: Are SCRH74-270 and SCRH74B-270 interchangeable? A: SCRH74-270 and SCRH74B-270 have identical electrical specifications and both are RoHS3 compliant. Both are surface mount shielded 27 µH inductors with 1.12 A current rating and are functionally interchangeable for the same applications.

Q: What is the temperature range consideration when selecting a substitute? A: The original SPD74-273M operates from -55°C to 125°C. HRSPD74-273M extends the upper limit to 130°C. SCB75C-270, SCRH74-270, and SCRH74B-270 operate from -40°C to 125°C, which reduces the lower temperature operating range by 15°C.

Q: Do packaging differences affect substitutability? A: All parts are surface mount components with nonstandard packaging. HRSPD74-273M is supplied in Tape & Reel, while SCRH74-270 and SCRH74B-270 are also Tape & Reel. Physical dimensions vary slightly (0.287" to 0.307" square) and heights range from 0.177" to 0.198". Verify PCB layout compatibility before substitution.

Q: Why is RoHS compliance important for this component? A: RoHS compliance status determines applicability in regulated markets and end-use applications. The original SPD74-273M is RoHS non-compliant. Substitute parts SCB75C-270, SCRH74-270, and SCRH74B-270 offer RoHS3 compliance for products requiring environmental regulation adherence.

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