SPD127-824M Equivalent & Substitute Parts Reference

Part Overview

The SPD127-824M is a 820 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 650 mA continuous current with a maximum DC resistance of 1.4 Ohm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for nonstandard package applications requiring ferrite core shielding.

The SPD127-824M carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Substiute Parts

SPD127-824M

API Delevan Inc.In Stock: 1079SPD127-824M Datasheet

Current PartRFQ

HRSPD127-824M

API Delevan Inc.In Stock: 842HRSPD127-824M Datasheet

DirectRFQ

SRR1208-821KL

Bourns Inc.In Stock: 1477SRR1208-821KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-824M are identified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Primary Matching Criteria:

• Inductance value: 820 µH (exact match required)
• Core material: Ferrite (shielded configuration)
• Mounting type: Surface Mount
• Shielding requirement: Shielded
• Current rating: Equal to or greater than 650 mA
• DC resistance: Equal to or lower than 1.4 Ohm
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Package classification: Nonstandard

Substitute Categories:

Direct Manufacturer Substitute (API Delevan Inc.): HRSPD127-824M represents an active product from the same manufacturer within the SPD127 series family. This part maintains identical inductance specification, current rating, and core material while offering improved DC resistance (1.35 Ohm Max) and extended temperature range (-55°C to 130°C). The part is available in Tape & Reel packaging with active product status.

Similar Manufacturer Substitute (Bourns Inc.): SRR1208-821KL is an active product from Bourns Inc. within the SRR1208 series. This part matches the 820 µH inductance specification and ferrite shielded core configuration. The current rating is 550 mA, which is lower than the original 650 mA specification. DC resistance is 1.15 Ohm Max, providing superior performance. This part includes RoHS3 compliance and tighter inductance tolerance (±10%).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): HRSPD127-824M is the recommended substitute when maintaining API Delevan Inc. product lineage is required. This part is active in production, maintains identical electrical specifications (820 µH, 650 mA, ±20% tolerance), and provides marginal improvements in DC resistance (1.35 Ohm vs. 1.4 Ohm) and operating temperature range (-55°C to 130°C vs. -55°C to 125°C). Physical dimensions are nearly identical with minimal height increase (9.02mm vs. 8.00mm). Tape & Reel packaging availability supports automated assembly processes.

For Alternative Sourcing: SRR1208-821KL from Bourns Inc. provides an alternative when supply constraints or cost optimization is prioritized. This part maintains the 820 µH inductance and ferrite shielded core configuration. Key considerations include: (1) reduced current rating of 550 mA versus the original 650 mA specification—this part is suitable only for applications where actual operating current does not exceed 550 mA; (2) superior DC resistance of 1.15 Ohm Max, providing lower power dissipation; (3) tighter inductance tolerance of ±10% versus ±20%; (4) RoHS3 compliance status; (5) slightly larger physical footprint (12.70mm x 12.70mm vs. 12.00mm x 12.00mm). Operating temperature range is -40°C to 125°C, which does not extend to the lower -55°C limit of the original specification.

Selection Criteria Summary:

• Use HRSPD127-824M when full electrical equivalence and active product status from the original manufacturer are required
• Use SRR1208-821KL when operating current remains below 550 mA, RoHS3 compliance is mandated, and PCB layout accommodates the larger footprint
• Verify PCB layout clearances for height differences before final selection

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-824M be used as a direct drop-in replacement for SPD127-824M?

A: HRSPD127-824M is electrically equivalent with identical inductance (820 µH), current rating (650 mA), and tolerance (±20%). Physical dimensions are nearly identical (12.07mm x 12.07mm x 9.02mm vs. 12.00mm x 12.00mm x 8.00mm). The height increase of 1.02mm must be verified against PCB clearance requirements. HRSPD127-824M is the preferred substitute due to active product status and improved DC resistance.

Q: What is the primary limitation of SRR1208-821KL as a substitute?

A: The SRR1208-821KL has a reduced current rating of 550 mA compared to the original 650 mA specification. This part is suitable only for applications where the actual operating current does not exceed 550 mA. Additionally, the operating temperature range begins at -40°C rather than -55°C, which may be a constraint for low-temperature applications.

Q: Are there compliance differences between the substitute parts?

A: Yes. The SPD127-824M and HRSPD127-824M are both RoHS non-compliant. The SRR1208-821KL is RoHS3 compliant. If RoHS compliance is a design requirement, only SRR1208-821KL meets this criterion, provided the current rating limitation is acceptable.

Q: How do physical dimensions affect PCB layout compatibility?

A: The SPD127-824M measures 12.00mm x 12.00mm x 8.00mm. HRSPD127-824M measures 12.07mm x 12.07mm x 9.02mm (0.07mm larger in length/width, 1.02mm taller). SRR1208-821KL measures 12.70mm x 12.70mm x 8.50mm (0.70mm larger in length/width, 0.50mm taller). PCB footprints and vertical clearances must be verified before substitution.

Q: What is the difference in DC resistance between these parts?

A: SPD127-824M has 1.4 Ohm Max DCR. HRSPD127-824M has 1.35 Ohm Max DCR (0.05 Ohm improvement). SRR1208-821KL has 1.15 Ohm Max DCR (0.25 Ohm improvement). Lower DC resistance reduces power dissipation and heat generation in the inductor.

Q: Can inductance tolerance differences affect circuit performance?

A: SPD127-824M and HRSPD127-824M both have ±20% inductance tolerance. SRR1208-821KL has ±10% tolerance, providing tighter control. For applications sensitive to inductance variation, SRR1208-821KL offers superior tolerance performance, provided current rating and temperature range requirements are met.

Q: What packaging formats are available?

A: SPD127-824M packaging format is not specified. HRSPD127-824M and SRR1208-821KL are both available in Tape & Reel (TR) format, supporting automated pick-and-place assembly processes.

Q: Is saturation current a critical parameter for substitution?

A: Saturation current (Isat) indicates the current level at which inductance begins to degrade. HRSPD127-824M specifies Isat of 620 mA, and SRR1208-821KL specifies Isat of 770 mA. For applications operating near maximum current ratings, saturation current should be considered to ensure inductance stability.