SPD127-683M Equivalent & Substitute Parts Reference

Part Overview

The SPD127-683M is a 68 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 2.1 A with a maximum DC resistance of 140 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for nonstandard package applications. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	68 µH
Inductance Tolerance	±20%
Current Rating	2.1 A
DC Resistance (DCR)	140 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
Package Type	Nonstandard
Physical Dimensions	12.00 mm L x 12.00 mm W x 8.00 mm H (Max)

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127-683M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 68 µH (exact match required)
Inductance tolerance: ±20% or tighter
Current rating: minimum 2.1 A
DC resistance: 140 mOhm or lower
Shielding: shielded configuration
Core material: ferrite
Mounting type: surface mount
Operating temperature range: must encompass -55°C to 125°C minimum

Secondary Compatibility Factors:

Physical dimensions and height constraints for PCB layout
Package configuration (nonstandard)
RoHS and REACH compliance status

The substitute parts listed below meet the primary matching criteria and are classified as either direct equivalents or similar alternatives based on parameter alignment.

Parameter Comparison

Parameter	SPD127-683M	HRSPD127-683M	SCRH127-680	SRR1208-680YL
Manufacturer	API Delevan Inc.	API Delevan Inc.	Signal Transformer	Bourns Inc.
Inductance	68 µH	68 µH	68 µH	68 µH
Inductance Tolerance	±20%	±20%	±20%	±15%
Current Rating (Amps)	2.1 A	2.1 A	2.23 A	1.8 A
DC Resistance (DCR)	140 mOhm Max	125 mOhm Max	140 mOhm Max	135 mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Not specified	Ferrite
Operating Temperature Range	-55°C to 125°C	-55°C to 130°C	-40°C to 125°C	-40°C to 125°C
Inductance Test Frequency	1 kHz	100 kHz	1 kHz	1 kHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Type	Nonstandard	Nonstandard	Nonstandard	Nonstandard
Physical Dimensions (L x W)	12.00 mm x 12.00 mm	12.07 mm x 12.07 mm	12.50 mm x 12.50 mm	12.70 mm x 12.70 mm
Height (Max)	8.00 mm	9.02 mm	8.00 mm	8.50 mm
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HRSPD127-683M (Direct Equivalent - Preferred)

The HRSPD127-683M is the primary direct equivalent from the same manufacturer (API Delevan Inc.). It maintains identical inductance (68 µH), tolerance (±20%), and current rating (2.1 A) specifications. The DC resistance is improved at 125 mOhm maximum compared to 140 mOhm, and the operating temperature range extends to 130°C. Physical dimensions are nearly identical (12.07 mm vs. 12.00 mm), with a slightly increased height of 9.02 mm. This part is active in production and carries the same RoHS non-compliant status as the original. Selection of HRSPD127-683M is recommended for direct replacement in existing designs.

SCRH127-680 (Similar Alternative)

The SCRH127-680 from Signal Transformer meets all primary substitution criteria with 68 µH inductance, ±20% tolerance, and 2.23 A current rating (exceeding the 2.1 A requirement). DC resistance matches at 140 mOhm maximum. Physical dimensions are slightly larger at 12.50 mm x 12.50 mm with identical 8.00 mm height. This part is ROHS3 compliant, offering improved environmental compliance compared to the original. Operating temperature range is -40°C to 125°C, which does not extend to the lower -55°C limit. Selection is appropriate for applications where the -40°C minimum temperature is acceptable and RoHS compliance is required.

SRR1208-680YL (Similar Alternative - Current Derating)

The SRR1208-680YL from Bourns Inc. maintains 68 µH inductance with tighter ±15% tolerance and ferrite core construction. Current rating is 1.8 A, which is below the 2.1 A specification of the original part. DC resistance is 135 mOhm maximum, providing improved performance. Physical dimensions are larger at 12.70 mm x 12.70 mm with 8.50 mm height. This part is ROHS3 compliant and active in production. Selection is appropriate only for applications where the reduced 1.8 A current rating is acceptable, or where the improved tolerance and lower DCR provide design benefits that offset the current derating.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-683M be used as a direct replacement for SPD127-683M?

A: Yes. HRSPD127-683M is a direct equivalent manufactured by the same company (API Delevan Inc.) with identical inductance (68 µH), tolerance (±20%), and current rating (2.1 A). Physical dimensions are nearly identical, and DC resistance is improved. This is the recommended substitute.

Q: What is the key difference between SCRH127-680 and the original SPD127-683M?

A: SCRH127-680 has a slightly higher current rating (2.23 A vs. 2.1 A) and is ROHS3 compliant. However, the operating temperature range is -40°C to 125°C, which does not extend to the -55°C lower limit of the original. Physical dimensions are also slightly larger. This part is suitable for applications where -40°C minimum temperature is acceptable.

Q: Why is SRR1208-680YL listed as a substitute if its current rating is only 1.8 A?

A: SRR1208-680YL meets the inductance, tolerance, shielding, and core material requirements. However, its 1.8 A current rating is below the 2.1 A specification. This part should be selected only for applications where the actual circuit current does not exceed 1.8 A, or where design margins allow for the reduced rating. The improved DC resistance (135 mOhm) and tighter tolerance (±15%) may provide offsetting benefits in specific applications.

Q: Are there any RoHS compliance differences between these substitutes?

A: Yes. The original SPD127-683M and HRSPD127-683M are both RoHS non-compliant. SCRH127-680 and SRR1208-680YL are both ROHS3 compliant. If RoHS compliance is a design requirement, SCRH127-680 or SRR1208-680YL must be selected, with consideration given to their respective parameter differences.

Q: Do physical dimension differences affect PCB layout compatibility?

A: Yes. The original SPD127-683M is 12.00 mm x 12.00 mm x 8.00 mm. HRSPD127-683M is 12.07 mm x 12.07 mm x 9.02 mm (slightly larger height). SCRH127-680 is 12.50 mm x 12.50 mm x 8.00 mm. SRR1208-680YL is 12.70 mm x 12.70 mm x 8.50 mm. PCB footprints and clearance requirements must be verified before substitution, particularly for height-constrained applications.

Q: What is the significance of the inductance test frequency difference between parts?

A: The original SPD127-683M and SCRH127-680 are tested at 1 kHz, while HRSPD127-683M is tested at 100 kHz. SRR1208-680YL is tested at 1 kHz. The test frequency can affect measured inductance values, particularly in frequency-dependent applications. For circuits operating at frequencies significantly different from the test frequency, actual performance should be verified against the manufacturer's frequency response data.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Interchangeability in high-frequency applications depends on the specific frequency range and circuit requirements. SRR1208-680YL provides additional frequency response data (Q @ 2.52 MHz = 20, Self Resonant Frequency = 5 MHz), which may be beneficial for high-frequency designs. Other parts do not provide this data. Frequency response characteristics should be confirmed with manufacturer datasheets before selection for high-frequency applications.

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