SPD73-184M Equivalent & Substitute Parts

Part Overview

The SPD73-184M is a 180 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 399 mA with a maximum DC resistance of 1.45Ohm. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device with nonstandard packaging.

Substiute Parts

SPD73-184M

API Delevan Inc.In Stock: 845SPD73-184M Datasheet

Current PartRFQ

CDRH73NP-181MC-B

Sumida America Components Inc.In Stock: 1100CDRH73NP-181MC-B Datasheet

SimilarRFQ

SRR0745A-181M

Bourns Inc.In Stock: 4118SRR0745A-181M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD73-184M are qualified based on the following electrical and mechanical parameters:

• Inductance Value: 180 µH (exact match required)
• Inductance Tolerance: ±20% (matching tolerance specification)
• Core Material: Ferrite (shielded construction)
• Shielding: Shielded (electromagnetic containment requirement)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• Package Footprint: 7.30mm x 7.30mm (physical board space constraint)
• Inductance Test Frequency: 1 kHz (measurement standard)

Substitutes must maintain these core parameters. Variations in current rating, DC resistance, and height are permissible within the constraints of the application circuit, provided the inductor does not saturate under operating conditions and thermal dissipation remains acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both CDRH73NP-181MC-B and SRR0745A-181M are active production alternatives to the obsolete SPD73-184M. Selection between these substitutes depends on application-specific requirements:

CDRH73NP-181MC-B (Sumida America Components Inc.) is suitable for applications where the current rating of 390 mA is sufficient and the reduced height of 3.40mm provides board space advantage. This part maintains the same DC resistance specification as the original and is ROHS3 compliant with MSL 1 rating.

SRR0745A-181M (Bourns Inc.) offers superior current handling at 460 mA with lower DC resistance of 820mOhm, reducing thermal dissipation. This part extends the upper operating temperature to 125°C, matching the original specification, and includes AEC-Q200 automotive qualification. ROHS3 compliance and MSL 1 rating are provided.

Both substitutes share identical footprint dimensions (7.30mm x 7.30mm) and inductance specifications with the original part. Height differences must be evaluated against PCB clearance constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can CDRH73NP-181MC-B replace SPD73-184M in all applications?

A: CDRH73NP-181MC-B is electrically compatible where the circuit current does not exceed 390 mA. The reduced operating temperature upper limit of 100°C versus 125°C must be verified against application thermal requirements. Physical height of 3.40mm is lower than the original 3.90mm, providing board clearance advantage.

Q: What is the primary advantage of SRR0745A-181M over the original SPD73-184M?

A: SRR0745A-181M provides 61 mA higher current rating (460 mA versus 399 mA) and significantly lower DC resistance (820mOhm versus 1.45Ohm), resulting in reduced power dissipation and heat generation. Operating temperature range extends to 125°C, matching the original specification. AEC-Q200 qualification provides automotive-grade reliability.

Q: Are all three parts pin-compatible?

A: All three parts share identical footprint dimensions of 7.30mm x 7.30mm and are surface mount devices. Height variations (3.90mm, 3.40mm, and 4.70mm respectively) must be confirmed against PCB assembly clearance requirements and solder reflow profile compatibility.

Q: What compliance differences exist between the original and substitutes?

A: SPD73-184M is RoHS non-compliant. Both CDRH73NP-181MC-B and SRR0745A-181M are ROHS3 compliant. For applications requiring RoHS compliance, either substitute is acceptable. Both substitutes carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: How do the DC resistance values affect circuit performance?

A: DC resistance directly impacts power dissipation and voltage drop across the inductor. SRR0745A-181M at 820mOhm generates less heat than SPD73-184M at 1.45Ohm under identical current conditions. CDRH73NP-181MC-B maintains the original 1.45Ohm specification, preserving thermal characteristics of the original design.