PD73R-124K Equivalent & Substitute Parts

Part Overview

The PD73R-124K is a 120 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 450 mA continuous current with a maximum DC resistance of 570 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the temperature range of -55°C to 125°C and complies with RoHS3 and REACH requirements.

Substiute Parts

PD73R-124K

API Delevan Inc.In Stock: 1079PD73R-124K Datasheet

Current PartRFQ

SDR0805-121KL

Bourns Inc.In Stock: 9373SDR0805-121KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PD73R-124K is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 120 µH ±10%
• Core type: Ferrite drum core, unshielded
• Mounting: Surface mount configuration
• Inductance test frequency: 1 kHz

Secondary Compatibility Criteria:

• Current rating must equal or exceed 450 mA
• DC resistance must not exceed 570 mOhm
• Operating temperature range must encompass -55°C to 125°C or be compatible with application requirements
• RoHS3 and REACH compliance status

The SDR0805-121KL from Bourns Inc. meets all primary matching criteria and exceeds secondary performance specifications, providing enhanced current handling capability (660 mA vs. 450 mA) and lower DC resistance (480 mOhm vs. 570 mOhm).

Parameter Comparison

Engineering Selection Recommendations

The SDR0805-121KL is a direct functional substitute for the obsolete PD73R-124K. Both components maintain identical inductance values, tolerance specifications, and core material composition. The substitute part is manufactured by Bourns Inc., an active supplier with 9,340 units in current inventory, ensuring procurement availability.

The SDR0805-121KL provides superior electrical performance characteristics: current rating increased from 450 mA to 660 mA, saturation current increased from 450 mA to 1 A, and DC resistance reduced from 570 mOhm to 480 mOhm. These improvements provide additional design margin without compromising compatibility.

Both parts maintain ROHS3 compliance and REACH unaffected status. The operating temperature range of the substitute part (-40°C to 125°C) covers the upper operating limit of the original part. Applications requiring the full -55°C lower temperature specification of the PD73R-124K must evaluate whether the -40°C minimum of the SDR0805-121KL is acceptable for the specific use case.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-121KL directly replace the PD73R-124K in existing designs?

A: Yes. Both components share identical inductance values (120 µH ±10%), core material (ferrite), shielding configuration (unshielded), and mounting type (surface mount). The substitute part meets or exceeds all electrical specifications of the original component.

Q: What are the physical dimension differences between these parts?

A: The PD73R-124K measures 0.303" L × 0.272" W × 0.138" H (7.70mm × 6.91mm × 3.50mm). The SDR0805-121KL measures 0.307" L × 0.307" W × 0.209" H (7.80mm × 7.80mm × 5.30mm). The substitute part is slightly larger in all dimensions. PCB layout verification is required to confirm fit within available space constraints.

Q: Are there packaging differences between the original and substitute parts?

A: The PD73R-124K packaging is listed as nonstandard. The SDR0805-121KL is supplied in Tape & Reel (TR) format, which is standard for high-volume procurement and automated assembly processes.

Q: What is the significance of the lower operating temperature limit difference?

A: The PD73R-124K operates from -55°C to 125°C, while the SDR0805-121KL operates from -40°C to 125°C. Applications requiring operation below -40°C must evaluate whether this temperature specification gap affects system performance or reliability requirements.

Q: How do the DC resistance specifications compare?

A: The PD73R-124K specifies a maximum DC resistance of 570 mOhm, while the SDR0805-121KL specifies 480 mOhm maximum. The lower resistance of the substitute part reduces power dissipation and heat generation in the inductor, providing improved efficiency.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the PD73R-124K and SDR0805-121KL are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.