SPD127R-684M Equivalent & Substitute Parts

Part Overview

The SPD127R-684M is a 680 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 700 mA and maximum DC resistance of 1.22 Ohm. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application.

Substiute Parts

SPD127R-684M

API Delevan Inc.In Stock: 993SPD127R-684M Datasheet

Current PartRFQ

SRR1208-681KL

Bourns Inc.In Stock: 2916SRR1208-681KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127R-684M is determined by the following critical parameters:

Inductance Value: 680 µH nominal inductance is the primary electrical specification. Substitute parts must maintain this value within acceptable tolerance ranges.

Current Rating: The SPD127R-684M supports 700 mA continuous current. Substitute parts must support equal or greater current capacity to ensure thermal and electrical performance equivalence.

DC Resistance: Maximum DC resistance of 1.22 Ohm establishes the upper limit for power dissipation characteristics. Substitute parts with equal or lower DCR values maintain or improve efficiency.

Core Type and Shielding: Ferrite core material with shielding configuration must be preserved to maintain electromagnetic performance and EMI containment.

Mounting and Package: Surface mount configuration with nonstandard package dimensions requires mechanical compatibility verification.

Compliance Standards: ROHS3 compliance and operating temperature range (-55°C to 125°C) establish regulatory and environmental operating boundaries.

The SRR1208-681KL from Bourns Inc. qualifies as a substitute based on matching inductance value, ferrite shielded drum core construction, surface mount configuration, and ROHS3 compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The SPD127R-684M remains the specified component when the application requires the full 700 mA current rating and extended low-temperature operation down to -55°C.

Substitute Consideration: The SRR1208-681KL from Bourns Inc. is electrically compatible for applications where the current requirement does not exceed 600 mA continuous operation. The Bourns part provides advantages in DC resistance (1.0 Ohm vs. 1.22 Ohm maximum) and inductance tolerance (±10% vs. ±20%), resulting in improved efficiency and tighter performance specifications.

Mechanical Compatibility: PCB layout verification is required when substituting the SRR1208-681KL, as the footprint is 0.70mm larger in length and width (12.70mm vs. 12.00mm) and 0.5mm taller in height (8.50mm vs. 8.00mm). Clearance validation for surrounding components is necessary.

Temperature Range Consideration: Applications requiring operation below -40°C must retain the SPD127R-684M, as the Bourns substitute is rated only to -40°C minimum.

Compliance Status: Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring regulatory equivalence for supply chain and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the SRR1208-681KL directly replace the SPD127R-684M in all applications?

A: Direct replacement is possible only when the application current requirement does not exceed 600 mA continuous operation and the minimum operating temperature does not fall below -40°C. PCB layout modifications may be required due to larger package dimensions.

Q: What is the significance of the inductance tolerance difference between these parts?

A: The SPD127R-684M has ±20% tolerance while the SRR1208-681KL has ±10% tolerance. The Bourns part provides tighter inductance accuracy, which may be beneficial for applications with strict frequency response or filtering requirements. However, both parts meet the 680 µH nominal specification.

Q: How does the DC resistance difference affect circuit performance?

A: The SRR1208-681KL has lower maximum DC resistance (1.0 Ohm vs. 1.22 Ohm), resulting in reduced power dissipation and improved efficiency. For low-current applications, this difference may be negligible; for high-current or thermal-sensitive designs, the lower DCR of the Bourns part is advantageous.

Q: Are there physical space constraints when using the SRR1208-681KL as a substitute?

A: Yes. The Bourns part has a larger footprint (12.70mm x 12.70mm vs. 12.00mm x 12.00mm) and greater height (8.50mm vs. 8.00mm). Verify available PCB space and clearance to adjacent components before substitution.

Q: Do both parts meet the same regulatory and environmental standards?

A: Yes. Both the SPD127R-684M and SRR1208-681KL are ROHS3 compliant, have MSL 1 (unlimited moisture sensitivity), and are classified as REACH Unaffected with ECCN EAR99 designation.

Q: What is the current saturation rating and why does it matter?

A: The SPD127R-684M has saturation current of 700 mA, while the SRR1208-681KL has 820 mA. Saturation current represents the point at which inductance begins to degrade significantly. The Bourns part has higher saturation margin, providing better performance under transient overcurrent conditions.

Q: Which part should be selected for new designs?

A: For new designs, evaluate the specific current and temperature requirements. If the application operates at or below 600 mA and above -40°C, the SRR1208-681KL offers superior DC resistance and tighter tolerance specifications. If extended low-temperature operation or full 700 mA rating is required, specify the SPD127R-684M.