SPD127-684M

Part Overview

The SPD127-684M is a 680 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 700 mA continuous current with a maximum DC resistance of 1.22 Ohm. The component operates across an extended temperature range of -55°C to 125°C and features ferrite core construction with surface mount packaging. This part carries an Obsolete product status. Identification of equivalent substitute parts is necessary to support ongoing designs and procurement continuity, as original stock availability becomes limited.

Substiute Parts

SPD127-684M

API Delevan Inc.In Stock: 870SPD127-684M Datasheet

Current PartRFQ

HRSPD127-684M

API Delevan Inc.In Stock: 1434HRSPD127-684M Datasheet

DirectRFQ

CDRH127/HPNP-681MC

Sumida America Components Inc.In Stock: 850CDRH127/HPNP-681MC Datasheet

SimilarRFQ

SRR1208-681KL

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-684M are classified based on strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance: 680 µH (required match)
• Core Material: Ferrite (required match)
• Shielding: Shielded (required match)
• Mounting Type: Surface Mount (required match)
• DC Resistance: 1.22 Ohm Max or lower (electrical compatibility)
• Current Rating: 700 mA or greater (functional requirement)
• Operating Temperature Range: -55°C to 125°C minimum overlap (thermal compatibility)
• Package: Nonstandard, 12 mm x 12 mm footprint with 8 mm height tolerance (mechanical fit)

Substitute parts must maintain the same inductance value and tolerance band, ferrite core construction, electromagnetic shielding, and surface mount configuration. Physical dimensions and thermal characteristics must support drop-in replacement within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-684M (Direct Substitute - Preferred) The HRSPD127-684M is the primary equivalent substitute, manufactured by the same supplier (API Delevan Inc.) and maintains identical inductance and DC resistance specifications. The current rating is marginally reduced (680 mA versus 700 mA). This part carries Active product status with extended availability, supporting long-term procurement. However, it maintains RoHS non-compliant status consistent with the original part. The height increase from 8.00 mm to 9.02 mm requires verification of board layout clearance.

CDRH127/HPNP-681MC (Functional Equivalent - Secondary Option) This Sumida America component provides 680 µH inductance with superior current rating (720 mA) and saturation current specification (980 mA). DC resistance is slightly elevated (1.31 Ohm Max versus 1.22 Ohm Max). The footprint increase to 12.50 mm x 12.50 mm and height match (8.00 mm) may require PCB layout adjustment. Operating temperature range is reduced to -40°C to 100°C, which narrows the lower temperature boundary relative to the original specification. Active product status supports ongoing availability.

SRR1208-681KL (Functional Equivalent - Tertiary Option) The Bourns SRR1208-681KL provides 680 µH inductance with improved inductance tolerance (±10% versus ±20%), offering tighter value specification. Current rating is the lowest (600 mA), requiring careful thermal margin evaluation in applications exceeding 600 mA. DC resistance is optimized (1.00 Ohm Max), reducing power dissipation. This part carries ROHS3 compliance, representing advancement in environmental standards. Footprint is the largest (12.70 mm x 12.70 mm) with 8.50 mm height. Active product status ensures commercial availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute HRSPD127-684M for SPD127-684M in all applications? The HRSPD127-684M maintains the same electrical specifications (680 µH, 1.22 Ohm DCR) with a current rating of 680 mA versus 700 mA on the original. Design margin assessment is required if the application runs near or above 680 mA. Physical height increases from 8.00 mm to 9.02 mm; verify available PCB clearance above the inductor pad.

Q: What are the key differences affecting part selection? Current rating, DC resistance, and footprint dimensions are the primary differentiators. HRSPD127-684M provides the closest electrical match with minimal footprint impact. CDRH127/HPNP-681MC offers higher current capacity but requires larger footprint and accepts reduced temperature range. SRR1208-681KL provides lowest DC resistance and RoHS compliance but operates at the lowest rated current.

Q: Is RoHS compliance required for this substitution? Both the original SPD127-684M and HRSPD127-684M are RoHS non-compliant. If RoHS compliance is a design requirement, only SRR1208-681KL qualifies (ROHS3 compliant). However, this introduces current rating and tolerance trade-offs.

Q: Which part is best for thermal-sensitive applications? DC resistance directly impacts power dissipation (P = I²R). SRR1208-681KL has the lowest DCR (1.00 Ohm), followed by the original and HRSPD127-684M (1.22 Ohm), then CDRH127/HPNP-681MC (1.31 Ohm). For maximum thermal efficiency, SRR1208-681KL is optimal if current rating is sufficient.

Q: Can these parts be used in high-temperature applications below -40°C? The CDRH127/HPNP-681MC is limited to -40°C, which may not satisfy designs requiring -55°C operation. HRSPD127-684M and SRR1208-681KL both support the -55°C lower boundary. If extended low-temperature operation below -40°C is required, HRSPD127-684M or SRR1208-681KL are mandatory.

Q: Are these parts available in the same packaging format? All substitute parts are specified as Tape & Reel (TR) packaging with Nonstandard case type, supporting automated assembly processes consistent with the original SPD127-684M surface mount design. Confirm supplier packaging specifications during procurement.