SPD127-273M Equivalent & Substitute Parts

Part Overview

The SPD127-273M is a 27 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 3.4 A with a maximum DC resistance of 60 mOhm. This surface mount component operates across -55°C to 125°C and is designed for nonstandard package applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	SPD127-273M
Inductance	27 µH
Inductance Tolerance	±20%
Current Rating	3.4 A
DC Resistance (DCR)	60 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Package Type	Nonstandard
Size	12.00mm x 12.00mm x 8.00mm (Max Height)

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127-273M is determined by the following critical parameters:

Inductance Value: Must be 27 µH with ±20% tolerance
Shielding: Must be shielded to maintain EMI performance
Core Material: Ferrite core required
Current Rating: Must support minimum 3.4 A operation
DC Resistance: Lower or equal DCR values are acceptable; higher values indicate increased losses
Mounting Type: Surface mount configuration required
Operating Temperature: Must support the application's thermal requirements
Package Compatibility: Nonstandard package with similar footprint dimensions

All three substitute parts meet these core electrical and mechanical criteria, though with variations in current saturation ratings, DCR specifications, and temperature ranges.

Parameter Comparison

Parameter	SPD127-273M	HRSPD127-273M	CDRH127/HPNP-270MC	SRR1208-270ML
Manufacturer	API Delevan Inc.	API Delevan Inc.	Sumida America Components Inc.	Bourns Inc.
Inductance	27 µH	27 µH	27 µH	27 µH
Inductance Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	3.4 A	2.9 A	3.6 A	3.0 A
Current - Saturation (Isat)	—	3.33 A	4.96 A	4.3 A
DC Resistance (DCR)	60 mOhm Max	63 mOhm Max	56.3 mOhm Max	48 mOhm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded	Shielded
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 130°C	-40°C ~ 100°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size (L x W)	12.00mm x 12.00mm	12.07mm x 12.07mm	12.50mm x 12.50mm	12.70mm x 12.70mm
Height - Seated (Max)	8.00mm	9.02mm	8.00mm	8.50mm
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

HRSPD127-273M (API Delevan Inc.): This part maintains API Delevan manufacturing continuity and operates across an extended temperature range (-55°C ~ 130°C). However, the current rating of 2.9 A falls below the original 3.4 A specification, making it suitable only for applications with reduced current demands. Product status is active with standard tape and reel packaging.

CDRH127/HPNP-270MC (Sumida America Components Inc.): This substitute offers the highest current rating at 3.6 A and the lowest DCR at 56.3 mOhm Max, providing superior electrical performance. The operating temperature range is -40°C ~ 100°C, which is narrower than the original part. This part is active and available in tape and reel packaging. Footprint dimensions are slightly larger (12.50mm x 12.50mm).

SRR1208-270ML (Bourns Inc.): This part delivers the lowest DCR at 48 mOhm Max and maintains the full -40°C ~ 125°C operating range. It is ROHS3 compliant, addressing environmental regulatory requirements. The current rating of 3.0 A is slightly below the original specification. This part is active and available in cut tape and digi-reel packaging. Footprint dimensions are the largest at 12.70mm x 12.70mm.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-273M replace SPD127-273M in all applications?

A: HRSPD127-273M is electrically compatible for inductance and core material. However, the current rating of 2.9 A is lower than the original 3.4 A. Substitution is valid only if your circuit operates at or below 2.9 A continuous current.

Q: Which substitute has the best electrical performance?

A: CDRH127/HPNP-270MC offers the highest current rating (3.6 A) and lowest DCR (56.3 mOhm Max), resulting in reduced power dissipation. SRR1208-270ML provides the lowest DCR (48 mOhm Max) overall, offering superior efficiency characteristics.

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

A: Yes. Footprint dimensions vary: SPD127-273M is 12.00mm x 12.00mm, while CDRH127/HPNP-270MC is 12.50mm x 12.50mm and SRR1208-270ML is 12.70mm x 12.70mm. Height differences also exist (8.00mm to 9.02mm). Verify PCB clearance and component spacing before substitution.

Q: What is the impact of DCR differences on circuit performance?

A: Lower DCR values reduce resistive losses and heat generation. SRR1208-270ML (48 mOhm) and CDRH127/HPNP-270MC (56.3 mOhm) dissipate less power than the original SPD127-273M (60 mOhm). This improves efficiency but requires verification that the inductor's thermal characteristics remain within acceptable limits for your application.

Q: Does operating temperature range affect substitution decisions?

A: Yes. SPD127-273M operates to -55°C, while CDRH127/HPNP-270MC only reaches -40°C. If your application requires operation below -40°C, CDRH127/HPNP-270MC is not suitable. HRSPD127-273M and SRR1208-270ML both support -40°C minimum operation.

Q: Is RoHS compliance a factor in selecting a substitute?

A: SRR1208-270ML is ROHS3 compliant, while SPD127-273M and HRSPD127-273M are non-compliant. If your design or supply chain requires RoHS compliance, SRR1208-270ML is the appropriate choice, provided current and temperature requirements are met.

Q: What packaging formats are available for these substitutes?

A: HRSPD127-273M is supplied in tape and reel (TR) format. CDRH127/HPNP-270MC is supplied in tape and reel (TR) format. SRR1208-270ML is supplied in cut tape (CT) and digi-reel format. Verify packaging compatibility with your assembly process.

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