PM75-151K Equivalent & Substitute Parts Reference

Part Overview

The PM75-151K is a 150 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 580 mA with a maximum DC resistance of 640mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -30°C to 100°C and is mounted as a surface mount nonstandard package device.

Key Parameters

Parameter	Value
Inductance	150 µH
Inductance Tolerance	±10%
Current Rating	580 mA
DC Resistance (DCR)	640mOhm Max
Core Type	Ferrite, Unshielded Drum Core
Mounting Type	Surface Mount
Operating Temperature Range	-30°C ~ 100°C
Self Resonant Frequency	6 MHz
Physical Dimensions	0.307" L x 0.307" W x 0.209" H (7.80mm x 7.80mm x 5.30mm)

Substitute Part Grouping Explanation

Substitution for the PM75-151K is determined by strict equivalence across the following critical parameters:

Inductance value: 150 µH with ±10% tolerance
Current rating: 580 mA minimum
DC resistance: 640mOhm maximum
Core material and type: Ferrite, unshielded drum core
Mounting configuration: Surface mount, nonstandard package
Physical footprint compatibility: 7.80mm x 7.80mm base dimensions
Self-resonant frequency: 6 MHz nominal

Two substitute parts meet these criteria with documented compatibility:

SDR0805-151KL (Bourns Inc., Active status) – Direct manufacturer equivalent with enhanced specifications and RoHS3 compliance.

CR75NP-151KC (Sumida America Components Inc., Active status) – Cross-manufacturer alternative with matching core specifications and RoHS3 compliance.

Parameter Comparison

Parameter	PM75-151K	SDR0805-151KL	CR75NP-151KC
Manufacturer	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.
Product Status	Obsolete	Active	Active
Inductance	150 µH	150 µH	150 µH
Inductance Tolerance	±10%	±10%	±10%
Current Rating (Amps)	580 mA	580 mA	580 mA
DC Resistance (DCR)	640mOhm Max	680mOhm Max	640mOhm Max
Core Type	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core
Shielding	Unshielded	Unshielded	Unshielded
Self Resonant Frequency	6 MHz	6 MHz	6.1 MHz
Operating Temperature Range	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Base Dimensions (L x W)	0.307" x 0.307" (7.80mm x 7.80mm)	0.307" x 0.307" (7.80mm x 7.80mm)	0.307" x 0.276" (7.80mm x 7.00mm)
Height - Seated (Max)	0.209" (5.30mm)	0.209" (5.30mm)	0.217" (5.50mm)
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SDR0805-151KL is the primary substitute for the obsolete PM75-151K. Both components are manufactured by Bourns Inc., ensuring design continuity. The SDR0805-151KL maintains identical inductance, current rating, and physical footprint while offering an extended operating temperature range (-40°C to 125°C versus -30°C to 100°C) and RoHS3 compliance. The DC resistance specification increases from 640mOhm to 680mOhm maximum, which remains within acceptable tolerance for most applications requiring 150 µH inductance at 580 mA. The SDR0805-151KL is actively manufactured with substantial inventory availability.

CR75NP-151KC serves as a secondary cross-manufacturer alternative from Sumida America Components Inc. This part matches the original PM75-151K DC resistance specification (640mOhm maximum) and maintains identical inductance and current ratings. Physical dimensions show minor variation in width (7.00mm versus 7.80mm) and height (5.50mm versus 5.30mm), requiring PCB layout verification. The CR75NP-151KC is RoHS3 compliant and actively produced with documented inventory.

Selection between SDR0805-151KL and CR75NP-151KC depends on PCB layout constraints and DC resistance tolerance requirements. SDR0805-151KL is recommended for designs where the extended temperature range and identical physical footprint provide operational advantage. CR75NP-151KC is suitable for applications where the lower DC resistance specification matches design requirements and minor dimensional variation is accommodated.

Frequently Asked Questions (FAQ)

Q: Can SDR0805-151KL directly replace PM75-151K without PCB modification?

A: Yes. The SDR0805-151KL maintains identical base dimensions (7.80mm x 7.80mm) and height (5.30mm maximum), ensuring direct footprint compatibility on existing PCB layouts designed for PM75-151K.

Q: What is the significance of the DC resistance difference between PM75-151K (640mOhm) and SDR0805-151KL (680mOhm)?

A: The 40mOhm increase represents a 6.25% rise in maximum DC resistance. For circuits where inductor losses are critical, this difference must be evaluated against application power dissipation budgets. Both values remain within the ±10% inductance tolerance specification.

Q: Does CR75NP-151KC require PCB layout changes?

A: CR75NP-151KC exhibits minor dimensional variations: width is 7.00mm (versus 7.80mm) and height is 5.50mm (versus 5.30mm). PCB footprints designed for PM75-151K must be verified for clearance compatibility, particularly in height-constrained applications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both SDR0805-151KL and CR75NP-151KC are RoHS3 compliant, whereas the original PM75-151K is RoHS non-compliant. This compliance upgrade is beneficial for applications subject to RoHS regulatory requirements.

Q: What is the inventory status of substitute parts?

A: SDR0805-151KL has 7,800 pieces in stock. CR75NP-151KC has 904 pieces in stock. Both are actively manufactured and available for procurement.

Q: Can both substitutes operate across the full temperature range of the original PM75-151K?

A: SDR0805-151KL exceeds the original range, operating from -40°C to 125°C. CR75NP-151KC operates from -40°C to 100°C, matching the upper limit of PM75-151K (-30°C to 100°C) and extending the lower limit to -40°C.

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