PM1608-3R3M Equivalent & Substitute Parts

Part Overview

The PM1608-3R3M is a 3.3 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2 A continuous current with 80 mOhm maximum DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part operates across the temperature range of -40°C to 85°C and is mounted as a surface mount device in a nonstandard package configuration.

Key Parameters

Parameter	Value
Inductance	3.3 µH
Inductance Tolerance	±20%
Current Rating	2 A
Current - Saturation (Isat)	2 A
DC Resistance (DCR)	80 mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Type	Drum Core, Wirewound
Mounting Type	Surface Mount
Operating Temperature	-40°C to 85°C
Inductance Test Frequency	100 kHz
Size / Dimension	0.260" L x 0.175" W (6.60 mm x 4.45 mm)
Height - Seated (Max)	0.115" (2.92 mm)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PM1608-3R3M is determined by the following critical parameters:

Inductance value: 3.3 µH (±20% tolerance)
Current rating: minimum 2 A continuous
DC resistance: maximum 80 mOhm
Core material: Ferrite
Shielding configuration: Unshielded
Mounting type: Surface Mount
Physical dimensions: compatible with 0.260" L x 0.175" W footprint
Inductance test frequency: 100 kHz

Parts meeting all these criteria are classified as direct substitutes. Parts with reduced current ratings or slightly elevated DC resistance are classified as similar substitutes and require application-level verification of thermal and performance margins.

Parameter Comparison

Parameter	PM1608-3R3M	SDR6603-3R3M	SDR0703-3R3ML	IDC2512ER3R3M
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Vishay Dale
Inductance	3.3 µH	3.3 µH	3.3 µH	3.3 µH
Inductance Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	2 A	2 A	1.65 A	2 A
Current - Saturation (Isat)	2 A	2 A	2.35 A	2 A
DC Resistance (DCR)	80 mOhm Max	80 mOhm Max	75 mOhm Max	80 mOhm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Type	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Inductance Test Frequency	100 kHz	100 kHz	100 kHz	100 kHz
Size / Dimension	0.260" L x 0.175" W (6.60 mm x 4.45 mm)	0.260" L x 0.175" W (6.60 mm x 4.45 mm)	0.256" L x 0.177" W (6.50 mm x 4.50 mm)	0.260" L x 0.175" W (6.60 mm x 4.45 mm)
Height - Seated (Max)	0.115" (2.92 mm)	0.115" (2.92 mm)	0.106" (2.70 mm)	0.115" (2.92 mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SDR6603-3R3M is the primary direct substitute for PM1608-3R3M. Both parts share identical electrical specifications (3.3 µH, 2 A, 80 mOhm DCR), physical dimensions, and footprint. The SDR6603-3R3M offers extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and is ROHS3 compliant with active product status, making it suitable for new designs and ongoing production.

IDC2512ER3R3M from Vishay Dale is a direct electrical and dimensional equivalent with identical current rating, inductance, and DC resistance specifications. This part is ROHS3 compliant and active. Selection between Bourns and Vishay alternatives depends on supply chain availability and established vendor relationships.

SDR0703-3R3ML is classified as a similar substitute due to reduced continuous current rating (1.65 A versus 2 A) and lower DC resistance (75 mOhm maximum). Physical dimensions are marginally different (0.256" L x 0.177" W versus 0.260" L x 0.175" W) and seated height is reduced (0.106" versus 0.115"). This part is suitable only for applications where the 1.65 A rating meets system requirements.

Frequently Asked Questions (FAQ)

Q: Can SDR6603-3R3M directly replace PM1608-3R3M without circuit modification?

A: Yes. SDR6603-3R3M matches all critical electrical parameters (inductance, current rating, DC resistance) and physical dimensions. The extended operating temperature range and ROHS3 compliance provide additional design margin.

Q: What is the difference between PM1608-3R3M and SDR0703-3R3ML?

A: The primary difference is continuous current rating: PM1608-3R3M is rated for 2 A while SDR0703-3R3ML is rated for 1.65 A. DC resistance is also lower in the SDR0703 (75 mOhm max versus 80 mOhm max). Physical dimensions differ slightly. SDR0703-3R3ML is suitable only for applications with current requirements at or below 1.65 A.

Q: Are all substitute parts ROHS3 compliant?

A: SDR6603-3R3M and IDC2512ER3R3M are ROHS3 compliant. PM1608-3R3M is RoHS non-compliant. SDR0703-3R3ML is ROHS3 compliant. Compliance requirements depend on end-use application and regional regulations.

Q: Do the substitute parts have identical package dimensions?

A: SDR6603-3R3M and IDC2512ER3R3M have identical dimensions to PM1608-3R3M (0.260" L x 0.175" W, height 0.115"). SDR0703-3R3ML has slightly different dimensions (0.256" L x 0.177" W, height 0.106") and requires footprint verification before PCB layout commitment.

Q: What is the operating temperature difference between PM1608-3R3M and its substitutes?

A: PM1608-3R3M operates from -40°C to 85°C. SDR6603-3R3M, SDR0703-3R3ML, and IDC2512ER3R3M all operate from -40°C to 125°C, providing 40°C additional high-temperature margin.

Q: Can IDC2512ER3R3M from Vishay Dale be used in place of the Bourns PM1608-3R3M?

A: Yes. IDC2512ER3R3M is electrically and dimensionally equivalent with matching inductance (3.3 µH), current rating (2 A), and DC resistance (80 mOhm). Both are surface mount ferrite drum core wirewound inductors with identical footprints.

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