SPD127-274M Equivalent & Substitute Parts

Part Overview

The SPD127-274M is a 270 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 1.1 A with a maximum DC resistance of 520mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard 12.00mm x 12.00mm package.

Key Parameters

Parameter	SPD127-274M
Inductance	270 µH
Inductance Tolerance	±20%
Current Rating	1.1 A
DC Resistance (DCR)	520mOhm Max
Shielding	Shielded
Core Material	Ferrite
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Package Dimensions	12.00mm x 12.00mm x 8.00mm (Max Height)
Inductance Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitute parts for the SPD127-274M are qualified based on the following critical parameters:

Inductance Value: 270 µH (exact match required)
Inductance Tolerance: ±20% or tighter
Current Rating: Minimum 950 mA (0.95 A) to support the original 1.1 A specification
DC Resistance: Maximum 520mOhm to maintain electrical performance
Shielding: Shielded configuration required
Core Material: Ferrite
Mounting Type: Surface Mount
Package Footprint: Nonstandard 12.00mm x 12.00mm form factor or compatible alternative
Operating Temperature: Minimum -55°C to 125°C range

Two substitute parts meet these criteria: HRSPD127-274M (direct manufacturer equivalent) and SRR1208-271KL (similar alternative from Bourns Inc.).

Parameter Comparison

Parameter	SPD127-274M	HRSPD127-274M	SRR1208-271KL
Manufacturer	API Delevan Inc.	API Delevan Inc.	Bourns Inc.
Inductance	270 µH	270 µH	270 µH
Inductance Tolerance	±20%	±20%	±10%
Current Rating (Amps)	1.1 A	1.05 A	950 mA
Current - Saturation (Isat)	-	1.06 A	1.25 A
DC Resistance (DCR)	520mOhm Max	492mOhm Max	400mOhm Max
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 130°C	-40°C ~ 125°C
Inductance Test Frequency	1 kHz	10 kHz	1 kHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Dimensions	12.00mm x 12.00mm x 8.00mm	12.07mm x 12.07mm x 9.02mm	12.70mm x 12.70mm x 8.50mm
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

HRSPD127-274M is the primary direct substitute. Manufactured by the same supplier (API Delevan Inc.), it maintains the same inductance value and tolerance, with marginally lower current rating (1.05 A vs. 1.1 A) and improved DC resistance (492mOhm vs. 520mOhm). The extended operating temperature range (-55°C to 130°C) provides additional thermal margin. This part is active in production with Tape & Reel packaging available. Physical dimensions are nearly identical (12.07mm vs. 12.00mm), with a slightly increased height (9.02mm vs. 8.00mm) that may require PCB layout verification.

SRR1208-271KL is a secondary alternative from Bourns Inc. It meets the 270 µH inductance requirement with tighter tolerance (±10%), superior DC resistance (400mOhm), and higher saturation current (1.25 A). However, the current rating is 950 mA, which is below the original 1.1 A specification. This part is ROHS3 compliant, addressing environmental compliance requirements. Package dimensions are slightly larger (12.70mm x 12.70mm), requiring PCB footprint verification. The operating temperature range is -40°C to 125°C, which does not extend to the lower -55°C limit of the original part.

Selection between these substitutes depends on application requirements: choose HRSPD127-274M for closest electrical and thermal performance match, or SRR1208-271KL if RoHS3 compliance and lower DC resistance are prioritized and the reduced current rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-274M directly replace SPD127-274M without circuit modification?

A: HRSPD127-274M is electrically compatible as a direct substitute. The 1.05 A current rating is marginally lower than the original 1.1 A, but saturation current is specified at 1.06 A. Verify that your application does not require the full 1.1 A continuous rating. Physical dimensions are nearly identical; confirm PCB layout accommodates the 9.02mm maximum height versus the original 8.00mm.

Q: Is SRR1208-271KL suitable for applications requiring 1.1 A continuous current?

A: SRR1208-271KL has a 950 mA current rating, which is below the original 1.1 A specification. This part is suitable only for applications where the actual operating current does not exceed 950 mA. Saturation current is specified at 1.25 A, but this does not indicate continuous current capability.

Q: What are the package footprint differences?

A: SPD127-274M uses a 12.00mm x 12.00mm footprint with 8.00mm maximum height. HRSPD127-274M is 12.07mm x 12.07mm with 9.02mm height. SRR1208-271KL is 12.70mm x 12.70mm with 8.50mm height. All three are nonstandard packages; verify PCB layout compatibility before design implementation.

Q: Does SRR1208-271KL meet RoHS requirements?

A: SRR1208-271KL is ROHS3 compliant. SPD127-274M and HRSPD127-274M are both RoHS non-compliant. If RoHS compliance is required, SRR1208-271KL is the only option among these three parts, provided the 950 mA current rating meets application requirements.

Q: What is the difference in DC resistance between these parts?

A: SPD127-274M has 520mOhm maximum DCR. HRSPD127-274M has 492mOhm maximum DCR (5.4% lower). SRR1208-271KL has 400mOhm maximum DCR (23% lower). Lower DCR reduces power dissipation and heat generation. Select based on thermal and efficiency requirements of your circuit.

Q: Are these parts available in Tape & Reel packaging?

A: SPD127-274M packaging is not specified. HRSPD127-274M and SRR1208-271KL are both available in Tape & Reel (TR) packaging, suitable for automated assembly processes.

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