PD75R-333K Equivalent & Substitute Parts

Part Overview

The PD75R-333K is a 33 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.3 A with a maximum DC resistance of 150 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is ROHS3 compliant. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	33 µH
Tolerance	±10%
Current Rating	1.3 A
DC Resistance (Max)	150 mOhm
Core Type	Ferrite, Unshielded Drum Core
Mounting Type	Surface Mount
Operating Temperature	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the PD75R-333K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 33 µH (exact match required)
Inductance tolerance: ±10%
Core material: Ferrite
Shielding: Unshielded
Mounting type: Surface Mount
Current rating: Equal to or greater than 1.3 A
DC resistance: Equal to or less than 150 mOhm
Operating temperature range: Must encompass or exceed -55°C to 125°C

Secondary Compatibility Factors:

RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)
Package classification: Nonstandard

The two identified substitutes meet these criteria with variations in current rating, DC resistance, and operating temperature limits.

Parameter Comparison

Parameter	PD75R-333K (Main)	CDH74NP-330KC	SDR0805-330KL
Manufacturer	API Delevan Inc.	Sumida America Components Inc.	Bourns Inc.
Inductance	33 µH	33 µH	33 µH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	1.3 A	1.45 A	1.2 A
DC Resistance (Max)	150 mOhm	170 mOhm	140 mOhm
Core Type	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-55°C to 125°C	-40°C to 100°C	-40°C to 125°C
Size / Dimension (L x W)	0.303" x 0.272" (7.70mm x 6.91mm)	0.315" x 0.287" (8.00mm x 7.30mm)	0.307" x 0.307" (7.80mm x 7.80mm)
Height - Seated (Max)	0.197" (5.00mm)	0.205" (5.20mm)	0.209" (5.30mm)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CDH74NP-330KC (Sumida America Components Inc.): This substitute offers the highest current rating at 1.45 A, exceeding the original specification. DC resistance is 170 mOhm, which is 20 mOhm higher than the PD75R-333K. The operating temperature range is -40°C to 100°C, which does not extend to the lower -55°C limit of the original part. This substitute is suitable for applications where the lower temperature extreme is not required. The part is active and ROHS3 compliant.

SDR0805-330KL (Bourns Inc.): This substitute has a current rating of 1.2 A, which is 0.1 A below the original specification, and a DC resistance of 140 mOhm, which is superior to the original 150 mOhm specification. The operating temperature range is -40°C to 125°C, which matches the upper limit but does not extend to -55°C. This substitute is suitable for applications where the lower temperature extreme is not required. The part is active and ROHS3 compliant.

Both substitutes are physically larger than the original part. PCB layout verification is necessary to confirm fit within available space constraints.

Frequently Asked Questions (FAQ)

Q: Can CDH74NP-330KC be used as a direct replacement for PD75R-333K?

A: CDH74NP-330KC meets the core electrical specifications (33 µH inductance, ±10% tolerance, ferrite unshielded drum core) and exceeds the current rating requirement. However, its operating temperature range (-40°C to 100°C) does not extend to the -55°C lower limit of the original part. Use this substitute only if your application does not require operation below -40°C. Physical dimensions are also slightly larger.

Q: Can SDR0805-330KL be used as a direct replacement for PD75R-333K?

A: SDR0805-330KL meets the core electrical specifications and offers superior DC resistance (140 mOhm vs. 150 mOhm). However, its current rating is 1.2 A, which is 0.1 A below the original specification, and its operating temperature range (-40°C to 125°C) does not extend to -55°C. Use this substitute only if your application does not require operation below -40°C and if the 1.2 A current rating is sufficient for your circuit.

Q: What are the key differences in physical dimensions?

A: The PD75R-333K measures 7.70mm x 6.91mm with a maximum seated height of 5.00mm. CDH74NP-330KC measures 8.00mm x 7.30mm with a height of 5.20mm. SDR0805-330KL measures 7.80mm x 7.80mm with a height of 5.30mm. All three parts are larger than typical 0805 package components. Verify PCB layout clearances before substitution.

Q: Are all substitutes RoHS3 compliant?

A: Yes. The PD75R-333K, CDH74NP-330KC, and SDR0805-330KL are all ROHS3 compliant with moisture sensitivity level 1 (Unlimited).

Q: Why is the PD75R-333K obsolete?

A: The product status indicates obsolescence. Active alternatives from Sumida America Components Inc. and Bourns Inc. are available for new designs and ongoing procurement.

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