SPD73R-333M Equivalent & Substitute Parts

Part Overview

The SPD73R-333M is a 33 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications requiring moderate current handling and low DC resistance. This component operates across an industrial temperature range of -55°C to 125°C and is ROHS3 compliant. The part is currently active in production with 662 pieces available in inventory. Substitute parts may be required due to inventory constraints, lead time considerations, or specific application requirements related to DC resistance characteristics or operating temperature ranges.

Substiute Parts

SPD73R-333M

API Delevan Inc.In Stock: 735SPD73R-333M Datasheet

Current PartRFQ

SRR0745A-330M

Bourns Inc.In Stock: 950405SRR0745A-330M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-333M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 33 µH (exact match required)
• Inductance tolerance: ±20% (must be equal or tighter)
• Current rating: 1.35 A minimum (equal or higher acceptable)
• Shielding: Shielded (required for EMI performance)
• Core material: Ferrite (required for frequency response characteristics)
• Mounting type: Surface Mount (required for PCB compatibility)
• Package footprint: 7.30 x 7.30 mm (required for board layout compatibility)

Secondary Consideration Parameters:

• DC Resistance: 240 mOhm maximum (lower values acceptable; higher values require application verification)
• Operating temperature range: -55°C to 125°C minimum (extended ranges acceptable)
• Saturation current: 1.35 A minimum (higher values acceptable)
• RoHS and REACH compliance status (must maintain regulatory alignment)

The SRR0745A-330M qualifies as a substitute based on matching all primary criteria and offering improved DC resistance characteristics (150 mOhm maximum versus 240 mOhm maximum).

Parameter Comparison

Engineering Selection Recommendations

SPD73R-333M Selection Criteria:

• Applications requiring extended low-temperature operation below -40°C
• Designs with strict height constraints (3.90 mm maximum seated height)
• Specifications requiring maximum DC resistance tolerance of 240 mOhm
• Tape & Reel packaging requirements for automated assembly processes

SRR0745A-330M Selection Criteria:

• Applications where lower DC resistance (150 mOhm maximum) reduces power dissipation and improves efficiency
• Designs tolerating the increased seated height of 4.70 mm
• Operating temperature range limited to -40°C to 125°C
• Applications benefiting from higher saturation current rating (1.45 A versus 1.35 A)
• Cut Tape or Digi-Reel® packaging compatibility
• AEC-Q200 automotive qualification requirement

Both parts maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and identical inductance and current specifications. The substitute part offers superior DC resistance characteristics, making it suitable for applications where thermal management or efficiency is a design priority.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-330M replace SPD73R-333M in all applications?

A: Substitution is valid for applications where the operating temperature range does not require operation below -40°C and where the increased seated height of 4.70 mm (versus 3.90 mm) does not create PCB layout conflicts. The lower DC resistance of the substitute part is beneficial in most applications.

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

A: The SRR0745A-330M has a maximum DC resistance of 150 mOhm compared to 240 mOhm for the SPD73R-333M. Lower DC resistance reduces resistive losses and heat generation during operation. For applications carrying sustained current near the 1.35 A rating, the substitute part will dissipate approximately 37.5% less power due to resistance.

Q: Are the package footprints identical?

A: Yes, both parts have identical footprint dimensions of 7.30 x 7.30 mm, allowing direct PCB layout compatibility. However, the seated height differs: SPD73R-333M is 3.90 mm maximum, while SRR0745A-330M is 4.70 mm maximum. Verify clearance in your specific PCB assembly before substitution.

Q: What packaging formats are available for each part?

A: The SPD73R-333M is supplied in Tape & Reel (TR) format. The SRR0745A-330M is available in Cut Tape (CT) and Digi-Reel® formats. Confirm packaging compatibility with your procurement and assembly processes.

Q: Do both parts meet the same regulatory standards?

A: Yes, both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8504.50.4000. Both maintain MSL 1 (unlimited) moisture sensitivity rating.

Q: What is the temperature range limitation for the substitute part?

A: The SRR0745A-330M operates from -40°C to 125°C, compared to the SPD73R-333M range of -55°C to 125°C. If your application requires operation below -40°C, the original part must be used.

Q: Is the AEC-Q200 rating on the substitute part significant?

A: The SRR0745A-330M carries AEC-Q200 automotive qualification, indicating compliance with automotive reliability standards. The SPD73R-333M does not list this certification. If automotive qualification is required, the substitute part provides this advantage.