PM1608-151M Equivalent & Substitute Parts

Part Overview

The PM1608-151M is a 150 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 250 mA with a maximum DC resistance of 2Ω. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across the temperature range of -40°C to 85°C and is tested at 100 kHz inductance frequency.

Key Parameters

Parameter	Value
Inductance	150 µH
Inductance Tolerance	±20%
Current Rating	250 mA
Current - Saturation (Isat)	270 mA
DC Resistance (DCR)	2Ω Max
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package Type	Nonstandard
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PM1608-151M is determined by the following critical parameters: inductance value (150 µH), current rating (250 mA minimum), DC resistance (2Ω maximum), core material (ferrite), and shielding type (unshielded). All substitute parts must maintain these electrical specifications to ensure functional equivalence in the circuit.

The substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications and are sourced from the same manufacturer (Bourns Inc.). These parts differ primarily in product status (active vs. obsolete) and compliance certifications.

Similar Alternatives provide the same inductance, current rating, and DC resistance but may originate from different manufacturers or have minor variations in tolerance, saturation current, or package dimensions. These parts are suitable when the primary equivalent is unavailable.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating	Isat	DCR	Operating Temp	Product Status	RoHS Status
PM1608-151M	Bourns Inc.	150 µH	±20%	250 mA	270 mA	2Ω Max	-40°C ~ 85°C	Obsolete	RoHS non-compliant
SDR6603-151M	Bourns Inc.	150 µH	±20%	250 mA	270 mA	2Ω Max	-40°C ~ 125°C	Active	ROHS3 Compliant
SDR0703-151KL	Bourns Inc.	150 µH	±10%	250 mA	340 mA	2Ω Max	-40°C ~ 125°C	Active	ROHS3 Compliant
IDC2512ER151M	Vishay Dale	150 µH	±20%	250 mA	270 mA	2Ω Max	-40°C ~ 125°C	Active	ROHS3 Compliant
CM453232-150KL	Bourns Inc.	15 µH	±10%	200 mA	—	2.5Ω Max	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: SDR6603-151M

The SDR6603-151M is the recommended direct equivalent. It maintains identical electrical specifications (150 µH, 250 mA, 2Ω DCR) and is manufactured by Bourns Inc. The part is active in production and ROHS3 compliant. The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin compared to the obsolete PM1608-151M.

Secondary Substitute: SDR0703-151KL

The SDR0703-151KL offers improved inductance tolerance (±10% vs. ±20%) and higher saturation current (340 mA vs. 270 mA), providing enhanced performance margins. This part is active and ROHS3 compliant with the same extended temperature range.

Alternative Substitute: IDC2512ER151M

The IDC2512ER151M, manufactured by Vishay Dale, provides identical electrical specifications and is active in production with ROHS3 compliance. This option is suitable when Bourns Inc. parts are unavailable. The package designation differs (2512 vs. nonstandard), requiring mechanical verification for board layout compatibility.

Not Recommended: CM453232-150KL

The CM453232-150KL has significantly different electrical specifications (15 µH inductance, 200 mA current rating) and is not suitable as a substitute for the PM1608-151M.

Frequently Asked Questions (FAQ)

Q: Can SDR6603-151M directly replace PM1608-151M in existing designs?

A: Yes. The SDR6603-151M maintains identical inductance (150 µH), current rating (250 mA), and DC resistance (2Ω Max). Both parts use ferrite drum core construction and are unshielded. The extended operating temperature range of the SDR6603-151M provides additional design margin.

Q: What is the difference between SDR6603-151M and SDR0703-151KL?

A: Both parts meet the core electrical requirements. The SDR0703-151KL offers tighter inductance tolerance (±10% vs. ±20%) and higher saturation current (340 mA vs. 270 mA). Selection depends on whether the additional performance margin justifies any cost or availability differences.

Q: Are there package compatibility concerns with IDC2512ER151M?

A: The IDC2512ER151M uses a 2512 (6432 Metric) package designation, while the PM1608-151M uses a nonstandard package. Physical dimensions are identical (0.260" L x 0.175" W, 2.92mm height), but PCB footprint design must be verified for compatibility.

Q: Why is CM453232-150KL listed as a substitute if it has different specifications?

A: CM453232-150KL is not a functional substitute. It has different inductance (15 µH vs. 150 µH) and current rating (200 mA vs. 250 mA). This part should not be used as a replacement for PM1608-151M.

Q: What compliance advantages do the active substitutes offer?

A: SDR6603-151M, SDR0703-151KL, and IDC2512ER151M are all ROHS3 compliant, whereas PM1608-151M is RoHS non-compliant. For new designs or procurement requiring regulatory compliance, the active substitutes are required.

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