SPD125-823M Equivalent & Substitute Parts

Part Overview

The SPD125-823M is a 82 µH shielded inductor manufactured by API Delevan Inc., rated for 1.4 A maximum current with 190 mOhm DC resistance. This component is designed for surface mount applications in nonstandard package configurations. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

SPD125-823M

API Delevan Inc.In Stock: 1082SPD125-823M Datasheet

Current PartRFQ

SRR1206-820YL

Bourns Inc.In Stock: 1786SRR1206-820YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD125-823M is based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 82 µH (exact match required)
• Shielding type: Shielded configuration
• Core material: Ferrite
• Mounting type: Surface Mount
• Package class: Nonstandard

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 1.2 A (≥85% of original 1.4 A rating)
• DC resistance: Substitute must not exceed 190 mOhm significantly
• Operating temperature range: Substitute must cover or exceed -55°C ~ 125°C
• Physical dimensions: Substitute footprint must be compatible with PCB layout constraints

The SRR1206-820YL from Bourns Inc. meets these substitution criteria with matching inductance, shielding, core material, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SRR1206-820YL is a valid functional equivalent for the SPD125-823M based on matching inductance, shielding configuration, core material, and surface mount technology. The substitute is currently in active production status, ensuring long-term availability compared to the obsolete original part.

Compliance Considerations:

The SRR1206-820YL meets ROHS3 compliance requirements, whereas the SPD125-823M is RoHS non-compliant. For applications subject to RoHS regulations, the substitute provides regulatory alignment. Both parts are REACH Unaffected and classified under ECCN EAR99.

Current Rating Differential:

The substitute part is rated for 1.2 A maximum current, compared to the original 1.4 A rating. This represents an 85.7% capacity retention. Applications operating at or near the original 1.4 A specification require circuit-level analysis to confirm the substitute's adequacy. The substitute's saturation current of 2.1 A exceeds the original specification, providing additional margin in transient conditions.

Physical Footprint:

The SRR1206-820YL has a larger footprint (12.70 mm x 12.70 mm vs. 12.00 mm x 12.00 mm) and greater height (6.50 mm vs. 6.00 mm). PCB layout verification is required to confirm clearance compatibility with existing designs.

Temperature Range:

The substitute operates from -40°C to 125°C, compared to the original -55°C to 125°C. Applications requiring operation below -40°C cannot use this substitute without additional thermal analysis.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-820YL directly replace the SPD125-823M without PCB modifications?

A: Direct replacement depends on PCB layout constraints. The substitute is 0.70 mm larger in length and width and 0.50 mm taller. Physical clearance verification is required. If the original footprint accommodates these dimensional increases, replacement is feasible without PCB changes.

Q: What is the impact of the 1.2 A vs. 1.4 A current rating difference?

A: The substitute supports 85.7% of the original current rating. For applications operating below 1.2 A, the substitute is fully compatible. For applications requiring 1.2 A to 1.4 A, circuit analysis must confirm that the substitute's performance meets system requirements, including thermal and efficiency considerations.

Q: Are there electrical performance differences between these parts?

A: Both parts have identical inductance (82 µH) and shielding configuration. The substitute has lower DC resistance (185 mOhm vs. 190 mOhm), which reduces resistive losses. The substitute has tighter inductance tolerance (±15% vs. ±20%), providing better consistency. These differences are favorable for the substitute.

Q: Does the operating temperature range difference affect compatibility?

A: The substitute's minimum operating temperature is -40°C, compared to the original -55°C. For applications operating above -40°C, there is no impact. For applications requiring operation at -55°C or below, the substitute is not suitable without additional thermal management or design modification.

Q: What is the significance of the RoHS compliance difference?

A: The original part is RoHS non-compliant, while the substitute is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute provides regulatory alignment. For legacy systems without RoHS requirements, this difference is not functionally significant.

Q: Is the substitute available in the same packaging format?

A: The original part uses nonstandard packaging, while the substitute is available in Tape & Reel (TR) format. Standard packaging improves handling, storage, and automated assembly compatibility. This is an advantage for production environments.

Q: What parameters must remain identical for substitution to be valid?

A: Inductance value (82 µH), shielding type (shielded), core material (ferrite), and mounting type (surface mount) must match exactly. These parameters define the functional equivalence class. Variations in current rating, DC resistance, tolerance, and temperature range require application-specific evaluation.