PM1608-102M Equivalent & Substitute Parts

Part Overview

The PM1608-102M is a 1 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 70 mA maximum current with 13.8Ohm DC resistance. This component operates across the temperature range of -40°C to 85°C and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	1 mH
Current Rating	70 mA
DC Resistance (DCR)	13.8Ohm Max
Saturation Current (Isat)	100 mA
Core Material	Ferrite
Shielding	Unshielded
Tolerance	±20%
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	Nonstandard
Size	0.260" L x 0.175" W (6.60mm x 4.45mm)
Height	0.115" (2.92mm)

Substitute Part Grouping Explanation

Substitution eligibility for the PM1608-102M is determined by the following critical parameters: inductance value, current rating, DC resistance, core material, shielding configuration, and physical dimensions. Substitute parts must maintain the same inductance specification (1 mH) and operate within compatible current ranges to ensure functional equivalence in the target application.

The substitute parts are categorized as follows:

Direct Equivalent: SDR6603-102M matches the PM1608-102M across all primary electrical specifications including inductance (1 mH), current rating (70 mA), DC resistance (13.8Ohm Max), saturation current (100 mA), and physical dimensions. This part is classified as a direct replacement.

Similar Substitute: SDR0703-102KL maintains the same inductance (1 mH) and operates within a compatible current range (80 mA vs. 70 mA), with marginally higher DC resistance (14.2Ohm Max vs. 13.8Ohm Max) and improved saturation current (130 mA vs. 100 mA). Physical dimensions are comparable.

Alternative Substitute: CM453232-121KL represents a lower inductance option (120 µH vs. 1 mH) with higher current rating (110 mA) and lower DC resistance (8Ohm Max). This part is suitable only for applications where the lower inductance value is acceptable.

Parameter Comparison

Parameter	PM1608-102M	SDR6603-102M	SDR0703-102KL	CM453232-121KL
Inductance	1 mH	1 mH	1 mH	120 µH
Current Rating (Amps)	70 mA	70 mA	80 mA	110 mA
Saturation Current (Isat)	100 mA	100 mA	130 mA	—
DC Resistance (DCR)	13.8Ohm Max	13.8Ohm Max	14.2Ohm Max	8Ohm Max
Tolerance	±20%	±20%	±10%	±10%
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Size / Dimension	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)	0.177" L x 0.126" W (4.50mm x 3.20mm)
Height - Seated (Max)	0.115" (2.92mm)	0.115" (2.92mm)	0.106" (2.70mm)	0.134" (3.40mm)

Engineering Selection Recommendations

SDR6603-102M is the primary recommended substitute. It is electrically and mechanically identical to the PM1608-102M across all specified parameters, maintains active product status, and achieves ROHS3 compliance. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin compared to the original part.

SDR0703-102KL is a secondary option suitable for applications where the 10% inductance tolerance is preferable to the ±20% tolerance of the original part. The higher saturation current (130 mA) and marginally higher DC resistance (14.2Ohm Max) are acceptable for most circuit topologies. Physical dimensions are nearly identical, ensuring PCB layout compatibility.

CM453232-121KL is applicable only in circuits where the lower inductance value (120 µH) does not compromise circuit function. This part offers superior current handling (110 mA) and lower DC resistance (8Ohm Max), but the significant inductance reduction makes it unsuitable for direct substitution in most applications.

All substitute parts maintain ferrite core construction, unshielded configuration, and surface mount compatibility with the original PM1608-102M.

Frequently Asked Questions (FAQ)

Q: Can SDR6603-102M be used as a direct replacement for PM1608-102M?

A: Yes. SDR6603-102M is electrically and mechanically equivalent to PM1608-102M. Both parts specify 1 mH inductance, 70 mA current rating, 13.8Ohm DC resistance, and identical physical dimensions. SDR6603-102M is the recommended direct substitute.

Q: What is the difference between SDR0703-102KL and PM1608-102M?

A: SDR0703-102KL maintains the same 1 mH inductance and 70 mA current rating but features improved inductance tolerance (±10% vs. ±20%), higher saturation current (130 mA vs. 100 mA), and marginally higher DC resistance (14.2Ohm Max vs. 13.8Ohm Max). Physical dimensions are comparable. These differences are acceptable for most applications.

Q: Why is CM453232-121KL listed as a substitute if the inductance is different?

A: CM453232-121KL is listed as an alternative substitute for applications where lower inductance (120 µH) is functionally acceptable. It is not a direct replacement due to the significant inductance reduction. Use this part only if circuit analysis confirms compatibility with 120 µH operation.

Q: Are all substitute parts RoHS compliant?

A: Yes. SDR6603-102M, SDR0703-102KL, and CM453232-121KL are all ROHS3 compliant. The original PM1608-102M is RoHS non-compliant.

Q: Do the substitute parts fit the same PCB footprint?

A: SDR6603-102M and SDR0703-102KL have nearly identical physical dimensions to PM1608-102M and are compatible with the same PCB layout. CM453232-121KL has a smaller footprint (4.50mm x 3.20mm vs. 6.60mm x 4.45mm) and requires PCB layout verification before use.

Q: What is the operating temperature range for substitute parts?

A: SDR6603-102M and SDR0703-102KL both operate across -40°C to 125°C, exceeding the original PM1608-102M specification of -40°C to 85°C. CM453232-121KL also operates across -40°C to 125°C.

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