PD75R-124K Equivalent & Substitute Parts

Part Overview

The PD75R-124K is a 120 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 680 mA continuous current with a maximum DC resistance of 570 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

PD75R-124K

API Delevan Inc.In Stock: 719PD75R-124K Datasheet

Current PartRFQ

SDR0805-121KL

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PD75R-124K is determined by the following critical parameters:

• Inductance Value: 120 µH ±10% tolerance
• Current Rating: Minimum 680 mA saturation current
• DC Resistance: Maximum 570 mOhm
• Core Type: Ferrite drum core, unshielded
• Mounting: Surface mount configuration
• Temperature Range: Support for -55°C to 125°C operation
• Compliance: ROHS3 compliance and MSL 1 rating

The SDR0805-121KL from Bourns Inc. meets all substitution criteria. It maintains the same 120 µH inductance value with ±10% tolerance, ferrite drum core construction, and unshielded configuration. The current rating of 660 mA is within acceptable operating margins relative to the 680 mA specification, and the DC resistance of 480 mOhm is superior to the 570 mOhm maximum. Both components share identical RoHS3 compliance and MSL 1 ratings, ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SDR0805-121KL is the qualified substitute for the PD75R-124K based on the following engineering criteria:

Product Status: The SDR0805-121KL maintains active production status with 9,340 units in stock, compared to the obsolete PD75R-124K with limited inventory of 673 units. This ensures long-term availability and supply chain stability.

Electrical Compatibility: Both components share identical inductance specifications (120 µH ±10%) and ferrite drum core construction. The SDR0805-121KL provides superior saturation current performance (1 A versus 680 mA) and lower DC resistance (480 mOhm versus 570 mOhm maximum), resulting in reduced power dissipation and improved thermal performance.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL 1 ratings, ensuring compatibility with current manufacturing and environmental standards.

Temperature Consideration: The SDR0805-121KL operates across -40°C to 125°C, which covers the upper portion of the PD75R-124K's -55°C to 125°C range. Applications requiring operation below -40°C require design review.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-121KL directly replace the PD75R-124K in existing designs?

A: Yes, for applications operating at or above -40°C. Both components share identical inductance values, tolerance specifications, and core construction. The SDR0805-121KL provides improved electrical performance with lower DC resistance and higher saturation current.

Q: What is the impact of the 20 mA difference in current rating?

A: The SDR0805-121KL is rated for 660 mA continuous current versus 680 mA for the PD75R-124K. For applications operating at or below 660 mA, this difference is not significant. Applications requiring the full 680 mA rating require thermal and saturation analysis.

Q: Are there package dimension differences between these parts?

A: Both components are surface mount inductors with similar footprints. The PD75R-124K measures 0.303" L × 0.272" W × 0.197" H (7.70mm × 6.91mm × 5.00mm), while the SDR0805-121KL measures 0.307" L × 0.307" W × 0.209" H (7.80mm × 7.80mm × 5.30mm). PCB layout verification is recommended for space-constrained applications.

Q: What is the significance of the lower DC resistance in the SDR0805-121KL?

A: The SDR0805-121KL's 480 mOhm maximum DC resistance compared to 570 mOhm reduces I²R power dissipation by approximately 16% at rated current, resulting in lower operating temperatures and improved reliability.

Q: Does the SDR0805-121KL support the full -55°C to 125°C temperature range?

A: The SDR0805-121KL is rated for -40°C to 125°C operation. Applications requiring operation below -40°C must use the original PD75R-124K or identify alternative components with extended low-temperature specifications.