744775133 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744775133 is a 33 µH unshielded drum core wirewound inductor rated for 1.35 A continuous current with a maximum DC resistance of 130mOhm. This surface mount component operates across the -40°C to 125°C temperature range and is ROHS3 compliant. The part is currently active in production with 16,300 units in stock. Substitute parts are identified when equivalent inductance values, current ratings, and thermal specifications meet or exceed the original component's performance envelope while maintaining compatible package dimensions and mounting characteristics.

Substiute Parts

744775133

Würth ElektronikIn Stock: 16345744775133 Datasheet

Current PartRFQ

SDR0805-330KL

Bourns Inc.In Stock: 4476SDR0805-330KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 744775133 are qualified based on the following critical parameters:

• Inductance Value: 33 µH ±10% tolerance maintained
• Current Rating: Minimum 1.2 A continuous current capability
• DC Resistance: Maximum 140mOhm (allowing up to 10mOhm variance from original specification)
• Core Type: Ferrite drum core, wirewound construction
• Shielding Configuration: Unshielded
• Operating Temperature: -40°C to 125°C minimum range
• Mounting: Surface mount, nonstandard package dimensions
• Compliance: ROHS3 compliant, REACH unaffected status

The Bourns SDR0805-330KL meets these substitution criteria with equivalent inductance, ferrite core construction, and compatible thermal specifications. The 1.2 A current rating represents a 11% reduction from the original 1.35 A specification, acceptable for applications where the design margin permits. DC resistance increases by 10mOhm, remaining within acceptable tolerance for this inductor category.

Parameter Comparison

Engineering Selection Recommendations

Both the 744775133 and SDR0805-330KL are active production components with ROHS3 compliance and unlimited moisture sensitivity ratings, suitable for industrial and commercial applications. The primary selection criterion is current capacity: the original 744775133 supports 1.35 A continuous current, while the Bourns substitute provides 1.2 A. Selection of the substitute part is appropriate for circuits where the maximum operating current does not exceed 1.2 A. The 10mOhm increase in DC resistance (130mOhm to 140mOhm) results in proportionally higher resistive losses and should be evaluated in power-sensitive applications. Both components maintain identical inductance values, core materials, and thermal operating ranges, ensuring functional equivalence within the specified current envelope.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-330KL directly replace the 744775133 in all applications?

A: Direct substitution is valid for circuits where the maximum continuous current requirement does not exceed 1.2 A. If the design operates at currents between 1.2 A and 1.35 A, thermal and saturation margin analysis is required before substitution.

Q: What is the impact of the 10mOhm increase in DC resistance?

A: The SDR0805-330KL exhibits 140mOhm maximum DC resistance compared to 130mOhm for the 744775133. In a 1.2 A circuit, this represents approximately 7.7% additional resistive loss. Power dissipation increases proportionally; thermal design review is recommended for high-current or thermally constrained applications.

Q: Are the physical dimensions compatible?

A: Both components are nonstandard package types with surface mount configuration. The 744775133 measures 7.80mm L × 7.00mm W × 5.50mm H (seated), while the SDR0805-330KL measures 7.80mm L × 7.80mm W × 5.30mm H (seated). The width difference of 0.80mm and height difference of 0.20mm must be verified against PCB layout constraints and clearance requirements.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 744775133 and SDR0805-330KL are ROHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited moisture sensitivity). Both are classified under ECCN EAR99 and HTSUS 8504.50.4000.

Q: What is the saturation current difference between these parts?

A: The 744775133 saturates at 1.47 A, while the SDR0805-330KL saturates at 1.9 A. Although the substitute exhibits higher saturation current, its continuous current rating of 1.2 A remains the limiting factor for sustained operation.