SPD73R-334M Equivalent & Substitute Parts

Part Overview

The SPD73R-334M is a 330 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a 500 mA current rating and 2.62Ohm maximum DC resistance. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs, particularly when primary part availability is limited or alternative sourcing is required.

Key Parameters

Parameter	Value	Unit
Inductance	330	µH
Inductance Tolerance	±20%	-
Current Rating	500	mA
DC Resistance (Max)	2.62	Ohm
Shielding	Shielded	-
Core Material	Ferrite	-
Mounting Type	Surface Mount	-
Package Dimensions	7.30 x 7.30 x 3.90	mm
Operating Temperature Range	-55°C to 125°C	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-334M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 330 µH (±20% tolerance band)
Core material: Ferrite shielded construction
Mounting type: Surface Mount (SMD)
Package footprint: 7.30mm x 7.30mm base dimensions
Inductance test frequency: 1 kHz

Secondary Compatibility Factors:

Current rating: Substitute must support minimum 500 mA operation
DC resistance: Lower DCR values are acceptable; higher values require circuit analysis
Operating temperature range: Substitute must cover or exceed -55°C to 125°C
Regulatory compliance: ROHS3 and REACH status alignment

The SRR0745A-331M from Bourns Inc. meets the primary matching criteria with identical inductance specification, ferrite core material, surface mount configuration, and matching 7.30mm x 7.30mm footprint. Differences in current rating (340 mA vs 500 mA) and DC resistance (1.5Ohm vs 2.62Ohm) require application-specific evaluation.

Parameter Comparison

Parameter	SPD73R-334M (API Delevan)	SRR0745A-331M (Bourns)	Compatibility Notes
Inductance	330 µH	330 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating	500 mA	340 mA	Substitute rated lower; application dependent
Current - Saturation	500 mA	400 mA	Substitute rated lower
DC Resistance (Max)	2.62 Ohm	1.5 Ohm	Substitute has lower resistance
Shielding	Shielded	Shielded	Identical
Core Material	Ferrite	Ferrite	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package Dimensions (L x W)	7.30 x 7.30 mm	7.30 x 7.30 mm	Identical footprint
Height (Max)	3.90 mm	4.70 mm	Substitute 0.80 mm taller
Operating Temperature	-55°C to 125°C	-40°C to 125°C	Substitute narrower low-end range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Identical
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

SPD73R-334M Selection Criteria:

Applications requiring 500 mA continuous current operation
Designs operating at temperatures below -40°C
Circuits where DC resistance of 2.62Ohm maximum is specified
Systems with height constraints up to 3.90mm

SRR0745A-331M Selection Criteria:

Applications with current requirements up to 340 mA
Operating temperature range of -40°C to 125°C is acceptable
Lower DC resistance (1.5Ohm) provides thermal efficiency benefits
PCB height tolerance accommodates 4.70mm maximum seated height
AEC-Q200 automotive qualification required

Both parts maintain ROHS3 compliance and identical inductance specifications at 1 kHz test frequency. The SRR0745A-331M carries AEC-Q200 automotive-grade certification, which may be required for specific applications. Selection between these parts depends on current rating requirements and operating temperature range specifications of the target circuit.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-331M replace SPD73R-334M in all applications?

A: Direct replacement is possible only when circuit current requirements do not exceed 340 mA and operating temperature remains above -40°C. The lower current rating and saturation current of the SRR0745A-331M must be verified against actual circuit operating conditions.

Q: What is the impact of different DC resistance values?

A: The SRR0745A-331M has 1.5Ohm maximum DC resistance compared to 2.62Ohm for the SPD73R-334M. Lower resistance reduces power dissipation and heat generation. This difference is beneficial in most applications but may affect circuit behavior in designs where DCR is a critical parameter.

Q: Are the package dimensions compatible?

A: Both parts share identical 7.30mm x 7.30mm footprints and are surface mount compatible. However, the SRR0745A-331M is 0.80mm taller (4.70mm vs 3.90mm seated height). PCB clearance and component stacking must be verified for height-constrained designs.

Q: What is the significance of AEC-Q200 certification on the Bourns part?

A: AEC-Q200 is an automotive-grade qualification standard. The SRR0745A-331M meets this specification, making it suitable for automotive and high-reliability applications. The SPD73R-334M does not list this certification.

Q: Do both parts meet the same regulatory requirements?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control. Both carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory compliance is equivalent between the two parts.

Q: What is the operating temperature consideration?

A: The SPD73R-334M operates from -55°C to 125°C, while the SRR0745A-331M operates from -40°C to 125°C. Applications requiring operation below -40°C must use the SPD73R-334M.

Q: How does inductance tolerance affect substitution?

A: Both parts carry ±20% inductance tolerance at 1 kHz test frequency. This identical tolerance specification ensures equivalent performance in circuits designed around the 330 µH nominal value.

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