PM1608-1R0M Equivalent & Substitute Parts

Part Overview

The PM1608-1R0M is a 1 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2.9 A with a maximum DC resistance of 50 mOhm. 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 mounted as a surface mount device in a nonstandard package configuration.

Key Parameters

Parameter	Value
Inductance	1 µH
Inductance Tolerance	±20%
Current Rating	2.9 A
DC Resistance (DCR)	50 mOhm Max
Core Type	Ferrite Drum Core
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature	-40°C to 85°C
Package Type	Nonstandard
Physical Dimensions	0.260" L x 0.175" W (6.60mm x 4.45mm)
Height (Seated Max)	0.115" (2.92mm)

Substitute Part Grouping Explanation

Substitution eligibility for the PM1608-1R0M is determined by the following critical parameters:

Inductance Value: Must be 1 µH with ±20% tolerance
Current Rating: Minimum 2.9 A saturation current
DC Resistance: Maximum 50 mOhm
Core Material & Type: Ferrite drum core or equivalent wirewound construction
Shielding Configuration: Unshielded
Mounting: Surface mount with compatible footprint dimensions (0.260" L x 0.175" W / 6.60mm x 4.45mm)
Package Classification: Nonstandard package with height ≤ 0.115" (2.92mm)

Parts meeting all these criteria are classified as direct equivalents. Parts meeting core electrical specifications but with minor dimensional or performance variations are classified as similar substitutes.

Parameter Comparison

Parameter	PM1608-1R0M	SDR6603-1R0M	SDR0703-1R0ML	P0770.102NL
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Pulse Electronics
Inductance	1 µH	1 µH	1 µH	1 µH
Inductance Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	2.9 A	2.9 A	2.2 A	2.9 A
Current - Saturation (Isat)	2.9 A	2.9 A	3.2 A	2.9 A
DC Resistance (DCR)	50 mOhm Max	50 mOhm Max	42 mOhm Max	50 mOhm Max
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core	Wirewound
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 130°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Type	Nonstandard	Nonstandard	Nonstandard	Nonstandard
Physical Dimensions	0.260" L x 0.175" W (6.60mm x 4.45mm)	0.260" L x 0.175" W (6.60mm x 4.45mm)	0.256" L x 0.177" W (6.50mm x 4.50mm)	0.260" L x 0.175" W (6.60mm x 4.45mm)
Height (Seated Max)	0.115" (2.92mm)	0.115" (2.92mm)	0.106" (2.70mm)	0.115" (2.92mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred): SDR6603-1R0M is the primary direct equivalent. It maintains identical electrical specifications (1 µH, 2.9 A, 50 mOhm DCR), matching footprint dimensions, and identical core construction. The part is active in production with RoHS3 compliance, providing long-term availability and regulatory alignment.

Similar Substitute (Secondary Option): SDR0703-1R0ML is a similar substitute from Bourns Inc. with identical inductance and tolerance but reduced current rating (2.2 A vs. 2.9 A) and lower DCR (42 mOhm vs. 50 mOhm). Dimensional variation is minimal (0.256" L x 0.177" W vs. 0.260" L x 0.175" W; height 0.106" vs. 0.115"). This part is suitable only for applications where the 2.2 A rating is sufficient. RoHS3 compliance and active status support long-term procurement.

Cross-Manufacturer Substitute: P0770.102NL from Pulse Electronics matches all critical electrical parameters (1 µH, 2.9 A, 50 mOhm DCR) and physical dimensions. The part is active with RoHS3 compliance and extended temperature range (-40°C to 130°C). Core material specification is not provided; verification of electromagnetic performance characteristics is necessary for applications with specific EMI/EMC requirements.

Frequently Asked Questions (FAQ)

Q: Can SDR6603-1R0M directly replace PM1608-1R0M without PCB modification? A: Yes. SDR6603-1R0M is a direct equivalent with identical electrical specifications, footprint dimensions (0.260" L x 0.175" W), and height (0.115"). No PCB layout changes are required.

Q: What is the key difference between SDR6603-1R0M and SDR0703-1R0ML? A: The primary difference is current rating: SDR6603-1R0M is rated for 2.9 A, while SDR0703-1R0ML is rated for 2.2 A. SDR0703-1R0ML also has lower DCR (42 mOhm vs. 50 mOhm) and slightly smaller dimensions. SDR0703-1R0ML is suitable only for applications where 2.2 A current capacity is adequate.

Q: Is P0770.102NL from Pulse Electronics a suitable replacement? A: P0770.102NL meets all critical electrical specifications and physical dimensions. However, the core material is not specified in the datasheet. For applications with specific electromagnetic performance or EMI/EMC requirements, cross-manufacturer substitution should be evaluated against detailed performance data.

Q: Why is PM1608-1R0M obsolete? A: PM1608-1R0M is classified as obsolete by the manufacturer. SDR6603-1R0M is the active production equivalent and is recommended for new designs and ongoing procurement.

Q: Are all substitute parts RoHS3 compliant? A: Yes. SDR6603-1R0M, SDR0703-1R0ML, and P0770.102NL are all RoHS3 compliant. PM1608-1R0M is RoHS non-compliant, making the active substitutes necessary for regulatory compliance in new applications.

Q: What is the temperature operating range difference? A: PM1608-1R0M operates from -40°C to 85°C. SDR6603-1R0M and SDR0703-1R0ML extend to -40°C to 125°C. P0770.102NL extends to -40°C to 130°C. Substitutes provide wider temperature margins for thermal design flexibility.

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