SPD73-334M Equivalent and Substitute Parts

Part Overview

The SPD73-334M is a 330 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 297 mA continuous current with a maximum DC resistance of 2.62 Ohm. This surface mount component operates across the temperature range of -55°C to 125°C and is classified as obsolete. Due to the obsolete product status, identifying equivalent substitute parts with compatible electrical and mechanical specifications is essential for design continuity and procurement flexibility.

Substiute Parts

SPD73-334M

API Delevan Inc.In Stock: 836SPD73-334M Datasheet

Current PartRFQ

CDRH73NP-331MC-B

Sumida America Components Inc.In Stock: 992CDRH73NP-331MC-B Datasheet

SimilarRFQ

SRR0745A-331M

Bourns Inc.In Stock: 1762SRR0745A-331M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD73-334M are qualified based on the following electrical and mechanical parameters:

Core Substitution Criteria:

• Inductance value: 330 µH (±20% tolerance maintained)
• Core material: Ferrite shielded construction
• Inductance frequency test: 1 kHz
• Mounting type: Surface Mount
• Package footprint: 0.287" L × 0.287" W (7.30mm × 7.30mm)

Current and Thermal Performance Criteria:

• Current rating must support or exceed the design requirement of 297 mA
• DC resistance must not exceed 2.62 Ohm to maintain acceptable circuit performance
• Operating temperature range must accommodate the application requirements

The substitute parts CDRH73NP-331MC-B and SRR0745A-331M meet these criteria while offering improved product status (Active) and enhanced compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

CDRH73NP-331MC-B (Sumida America Components Inc.) This substitute offers active product status with ROHS3 compliance and MSL 1 rating. The current rating of 280 mA is marginally below the original 297 mA specification. DC resistance matches the original at 2.62 Ohm Max. The operating temperature range (-40°C ~ 100°C) is narrower than the original (-55°C ~ 125°C), requiring verification for applications requiring extended low-temperature or high-temperature operation. Available in Tape & Reel packaging with 933 units in stock.

SRR0745A-331M (Bourns Inc.) This substitute provides active product status with ROHS3 compliance, MSL 1 rating, and AEC-Q200 qualification. The current rating of 340 mA exceeds the original specification with enhanced DC resistance of 1.5 Ohm Max, delivering lower power dissipation. The operating temperature range (-40°C ~ 125°C) supports the upper temperature limit of the original design. Available in Tape & Reel packaging with 1734 units in stock.

Frequently Asked Questions (FAQ)

Q: Can CDRH73NP-331MC-B replace SPD73-334M in all applications? The CDRH73NP-331MC-B shares identical inductance, tolerance, DC resistance, and package footprint. However, its current rating of 280 mA falls below the original 297 mA specification. Applications operating near the 297 mA threshold require detailed circuit analysis to confirm margin. The narrower operating temperature range (-40°C ~ 100°C versus -55°C ~ 125°C) eliminates this part from applications requiring low-temperature performance below -40°C or sustained operation above 100°C.

Q: Which substitute offers the best electrical performance? SRR0745A-331M provides superior electrical characteristics with a current rating of 340 mA and reduced DC resistance of 1.5 Ohm Max compared to the original 2.62 Ohm Max specification. This reduces power dissipation and thermal stress in the circuit. The full temperature range support (-40°C ~ 125°C) matches the original design envelope.

Q: Are both substitutes surface mount compatible with the original footprint? Both CDRH73NP-331MC-B and SRR0745A-331M maintain the identical footprint of 0.287" L × 0.287" W (7.30mm × 7.30mm) and are surface mount devices. PCB land pattern verification is necessary as height differences exist: SRR0745A-331M has a seated height of 0.185" (4.70mm) versus CDRH73NP-331MC-B at 0.134" (3.40mm) and the original at 0.154" (3.90mm).

Q: What compliance advantages do the substitutes offer? Both substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity levels, compared to the original RoHS non-compliant status. SRR0745A-331M includes AEC-Q200 qualification for automotive-grade reliability, providing additional assurance for harsh environment applications.

Q: How do inductance tolerances affect substitution? All three inductors share ±20% inductance tolerance at 1 kHz. Circuit designs relying on tight inductance matching should implement component selection protocols to ensure the specific tolerance band meets system requirements.