PM20-680K Equivalent & Substitute Parts

Part Overview

The PM20-680K is a 68 µH unshielded molded inductor manufactured by Bourns Inc., rated for 50 mA with a maximum DC resistance of 9Ohm. This component operates across a temperature range of -55°C to 125°C in a 1210 (3225 Metric) surface mount package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Inductance	68 µH
Current Rating	50 mA
DC Resistance (DCR)	9Ohm Max
Tolerance	±10%
Shielding	Unshielded
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Q @ Frequency	30 @ 2.52MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: inductance value (68 µH), DC resistance (9Ohm Max), shielding type (unshielded), package footprint (1210 / 3225 Metric), and current rating capability. The substitute parts are grouped into two categories:

Direct Substitutes (Bourns CM322522 Series): CM322522-680JL and CM322522-680KL maintain identical inductance, DC resistance, and physical dimensions. Both feature active product status and RoHS3 compliance. Current ratings of 65 mA exceed the original 50 mA requirement. Operating temperature ranges differ: CM322522 series operates -40°C to 125°C versus the original -55°C to 125°C.

Similar Substitutes: 1210-683J (API Delevan Inc.) and 744764168 (Würth Elektronik) match inductance, DC resistance, and package specifications. The 1210-683J provides higher current capacity (144 mA) with active status but non-compliant RoHS rating. The 744764168 offers RoHS3 compliance and active status with identical current rating (50 mA) and improved frequency characteristics.

Parameter Comparison

Parameter	PM20-680K (Main)	CM322522-680JL	CM322522-680KL	1210-683J	744764168
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Würth Elektronik
Inductance	68 µH	68 µH	68 µH	68 µH	68 µH
Current Rating (Amps)	50 mA	65 mA	65 mA	144 mA	50 mA
DC Resistance (DCR)	9Ohm Max	9Ohm Max	9Ohm Max	9Ohm Max	9Ohm Max
Tolerance	±10%	±5%	±10%	±5%	±10%
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Package / Case	1210 (3225 Metric)	Nonstandard	Nonstandard	1210 (3225 Metric)	1210 (3225 Metric)
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)	0.126" L x 0.098" W (3.20mm x 2.50mm)	0.126" L x 0.098" W (3.20mm x 2.50mm)	0.128" L x 0.095" W (3.25mm x 2.42mm)	0.126" L x 0.098" W (3.20mm x 2.50mm)
Height - Seated (Max)	0.087" (2.20mm)	0.087" (2.20mm)	0.087" (2.20mm)	0.101" (2.57mm)	0.094" (2.40mm)
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Q @ Frequency	30 @ 2.52MHz	30 @ 2.52MHz	30 @ 2.52MHz	30 @ 2.5MHz	30 @ 2.52MHz
Frequency - Self Resonant	12MHz	15MHz	15MHz	10MHz	12.5MHz
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

CM322522-680KL (Bourns Inc.): This part provides the closest functional match with identical inductance, DC resistance, tolerance (±10%), and physical dimensions. Active product status ensures long-term availability. RoHS3 compliance supports modern manufacturing requirements. The 65 mA current rating provides 30% margin above the original 50 mA specification. Operating temperature minimum of -40°C is acceptable for applications not requiring -55°C operation.

744764168 (Würth Elektronik): This alternative maintains identical current rating (50 mA), inductance, and DC resistance with RoHS3 compliance and active status. Physical dimensions and height match the original specification precisely. Operating temperature range extends to -40°C minimum, with upper limit of 105°C. Self-resonant frequency of 12.5MHz provides improved high-frequency performance.

CM322522-680JL (Bourns Inc.): Functionally equivalent to CM322522-680KL with tighter tolerance (±5%) and higher current rating (65 mA). RoHS3 compliance and active status are confirmed. Selection depends on tolerance requirements and availability constraints.

1210-683J (API Delevan Inc.): Provides highest current capacity (144 mA) with standard 1210 package footprint and temperature range matching the original (-55°C to 125°C). RoHS non-compliance may restrict use in regulated applications. Physical dimensions show minor variation (0.128" L x 0.095" W versus 0.126" L x 0.098" W).

Frequently Asked Questions (FAQ)

Q: Can CM322522-680KL directly replace PM20-680K in existing designs? A: Yes. Both parts share identical inductance (68 µH), DC resistance (9Ohm Max), physical dimensions (0.126" L x 0.098" W), and height (0.087" Max). The 65 mA current rating exceeds the original 50 mA requirement. Operating temperature minimum differs (-40°C versus -55°C); verify application requirements before selection.

Q: What is the difference between CM322522-680JL and CM322522-680KL? A: Both are Bourns CM322522 series inductors with identical electrical and physical specifications. CM322522-680JL features ±5% tolerance versus ±10% for CM322522-680KL. Selection depends on tolerance requirements and inventory availability.

Q: Is 744764168 suitable for applications requiring -55°C operation? A: No. The 744764168 operates from -40°C to 105°C. For applications requiring -55°C minimum temperature, select CM322522-680KL, CM322522-680JL, or 1210-683J.

Q: Does package footprint differ between substitute parts? A: CM322522-680KL and CM322522-680JL use nonstandard package designation but maintain identical physical dimensions (0.126" L x 0.098" W, 3.20mm x 2.50mm) to the original. 744764168 uses standard 1210 (3225 Metric) designation with matching dimensions. 1210-683J shows minor dimensional variation (0.128" L x 0.095" W, 3.25mm x 2.42mm) and increased height (0.101" versus 0.087").

Q: Which substitute offers the best compliance profile? A: CM322522-680KL, CM322522-680JL, and 744764168 all carry RoHS3 compliance. The original PM20-680K and 1210-683J are RoHS non-compliant. For regulated applications requiring RoHS compliance, select from the three compliant alternatives.

Q: What is the current margin provided by substitute parts? A: CM322522-680KL and CM322522-680JL provide 30% margin (65 mA versus 50 mA). 744764168 matches the original 50 mA rating with no margin. 1210-683J provides 188% margin (144 mA versus 50 mA).

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