SRR1208-100M Equivalent & Substitute Parts

Part Overview

The SRR1208-100M is a 10 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 5 A continuous current with a maximum DC resistance of 21 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently listed as obsolete, making identification of suitable equivalents essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	10 µH
Current Rating	5 A
DC Resistance (DCR)	21 mOhm Max
Tolerance	±20%
Core Type	Ferrite, Shielded Drum Core
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Package Type	Nonstandard
Size	12.70mm x 12.70mm x 8.50mm (Max Height)

Substitute Part Grouping Explanation

Substitute parts for the SRR1208-100M are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Inductance value: 10 µH (exact match required)
Current rating: minimum 5 A continuous
DC resistance: 21 mOhm or lower
Core material: Ferrite, shielded construction
Mounting: Surface mount
Temperature range: -40°C to 125°C minimum
Tolerance: ±20%

Two substitute parts meet these criteria with varying degrees of direct equivalence. The SRR1208-100ML is a direct manufacturer equivalent from Bourns Inc. with identical electrical specifications but active product status. The DR127-100-R from Eaton Electronics Division provides functional equivalence with enhanced current rating and lower DC resistance, though with minor dimensional variations.

Parameter Comparison

Parameter	SRR1208-100M (Main)	SRR1208-100ML (Direct)	DR127-100-R (Alternative)
Manufacturer	Bourns Inc.	Bourns Inc.	Eaton - Electronics Division
Inductance	10 µH	10 µH	10 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	5 A	5 A	6.04 A
Current - Saturation (Isat)	6.7 A	6.7 A	11.2 A
DC Resistance (DCR)	21 mOhm Max	21 mOhm Max	17.2 mOhm
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Size / Dimension	12.70mm x 12.70mm	12.70mm x 12.70mm	12.50mm x 12.50mm
Height - Seated (Max)	8.50mm	8.50mm	8.00mm
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SRR1208-100ML is the primary substitute for the obsolete SRR1208-100M. Both parts are manufactured by Bourns Inc. within the same SRR1208 series and share identical electrical specifications, tolerance, and thermal ratings. The SRR1208-100ML maintains active product status with higher inventory availability, ensuring long-term supply continuity. Both parts carry ROHS3 compliance and unlimited moisture sensitivity rating.

The DR127-100-R from Eaton Electronics Division serves as a functional alternative when the Bourns equivalent is unavailable. This part exceeds the minimum current rating requirement (6.04 A versus 5 A) and provides superior DC resistance performance (17.2 mOhm versus 21 mOhm maximum). Dimensional differences are minimal, with the DR127-100-R measuring 12.50mm x 12.50mm versus 12.70mm x 12.70mm, and seated height of 8.00mm versus 8.50mm. The DR127-100-R also maintains ROHS3 compliance and unlimited moisture sensitivity rating across the required operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the SRR1208-100ML directly replace the SRR1208-100M?

A: Yes. The SRR1208-100ML is a direct equivalent with identical inductance (10 µH), current rating (5 A), DC resistance (21 mOhm maximum), tolerance (±20%), core material (ferrite shielded), and operating temperature range (-40°C to 125°C). The primary difference is product status: SRR1208-100M is obsolete while SRR1208-100ML is active.

Q: What are the key differences between the SRR1208-100ML and DR127-100-R?

A: Both parts meet the 10 µH inductance and 5 A current rating requirements. The DR127-100-R provides higher saturation current (11.2 A versus 6.7 A) and lower DC resistance (17.2 mOhm versus 21 mOhm). Dimensional variations are minor: the DR127-100-R is 0.2mm smaller in length and width, and 0.5mm shorter in seated height. The SRR1208-100ML is the direct Bourns equivalent, while the DR127-100-R is a cross-manufacturer alternative.

Q: Are there packaging differences between these substitutes?

A: The SRR1208-100M and SRR1208-100ML use nonstandard packaging. The SRR1208-100M is supplied as standard packaging, while the SRR1208-100ML is available in Cut Tape (CT) and Digi-Reel format. The DR127-100-R is supplied in Tape & Reel (TR) format. All three parts are surface mount components with identical mounting compatibility.

Q: Do all substitutes meet compliance requirements?

A: Yes. The SRR1208-100M, SRR1208-100ML, and DR127-100-R are all ROHS3 compliant with REACH unaffected status. All three parts carry ECCN EAR99 classification and HTSUS code 8504.50.4000. Moisture sensitivity level is 1 (unlimited) for all parts.

Q: Which substitute should be selected for new designs?

A: The SRR1208-100ML is recommended for new designs as the active direct equivalent from the original manufacturer. The DR127-100-R is suitable when the Bourns part is unavailable or when the enhanced current rating and lower DC resistance provide design advantages.

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