PM20-4R7K Equivalent & Substitute Parts

Part Overview

The PM20-4R7K is a 4.7 µH unshielded molded inductor manufactured by Bourns Inc., rated for 220 mA with a maximum DC resistance of 1.7Ohm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part is housed in a 1210 (3225 Metric) surface mount package and operates across a temperature range of -55°C to 125°C.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Current Rating	220 mA
DC Resistance (Max)	1.7Ohm
Package / Case	1210 (3225 Metric)
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PM20-4R7K is determined by the following critical parameters:

Inductance Value: Must be 4.7 µH (exact match required)
Current Rating: Must meet or exceed 220 mA
DC Resistance: Must not exceed 1.7Ohm maximum
Package / Case: Must be 1210 (3225 Metric) or mechanically equivalent
Mounting Type: Must be Surface Mount
Shielding: Must be Unshielded
Physical Dimensions: Must match or be compatible with 0.126" L x 0.098" W (3.20mm x 2.50mm) footprint

The following parts meet these substitution criteria:

CM322522-4R7JL (Bourns Inc.) – Active status, improved compliance
CM322522-4R7KL (Bourns Inc.) – Active status, improved compliance
1210-472J (API Delevan Inc.) – Active status, higher current rating
74476404 (Würth Elektronik) – Active status, improved compliance

Parameter Comparison

Parameter	PM20-4R7K	CM322522-4R7JL	CM322522-4R7KL	1210-472J	74476404
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Würth Elektronik
Inductance	4.7 µH	4.7 µH	4.7 µH	4.7 µH	4.7 µH
Tolerance	±10%	±5%	±10%	±5%	±10%
Current Rating (Amps)	220 mA	165 mA	165 mA	352 mA	220 mA
DC Resistance (Max)	1.7Ohm	1.5Ohm	1.5Ohm	1.5Ohm	1.5Ohm
Q @ Freq	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.9MHz	30 @ 7.96MHz
Frequency - Self Resonant	50MHz	55MHz	55MHz	45MHz	45MHz
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
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)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: CM322522-4R7JL, CM322522-4R7KL, and 74476404 are all ROHS3 compliant, making them suitable for applications requiring regulatory compliance. The PM20-4R7K and 1210-472J are RoHS non-compliant.

For Extended Low-Temperature Operation (-55°C): PM20-4R7K and 1210-472J support operation down to -55°C. CM322522-4R7JL, CM322522-4R7KL, and 74476404 are rated to -40°C minimum, which may be limiting for extreme cold environments.

For Higher Current Margin: 1210-472J provides the highest current rating at 352 mA, offering significant headroom above the 220 mA requirement of the original part.

For Reduced DC Resistance: All substitute parts feature 1.5Ohm maximum DC resistance, compared to the original 1.7Ohm specification, resulting in lower power dissipation.

For Mechanical Compatibility: 74476404, 1210-472J, and the CM322522 series maintain the 1210 (3225 Metric) package footprint. The CM322522 parts are designated as nonstandard package but share identical physical dimensions with the original part.

Frequently Asked Questions (FAQ)

Q: Can CM322522-4R7JL or CM322522-4R7KL be used as direct replacements despite their lower current rating of 165 mA?

A: No. The original PM20-4R7K is rated for 220 mA. Substitutes with current ratings below 220 mA do not meet the minimum electrical requirements and may cause component failure or circuit malfunction under specified operating conditions.

Q: What is the difference between CM322522-4R7JL and CM322522-4R7KL?

A: Both parts are manufactured by Bourns Inc. in the CM322522 series with identical electrical and mechanical specifications. The primary difference is inductance tolerance: CM322522-4R7JL specifies ±5% tolerance, while CM322522-4R7KL specifies ±10% tolerance. Selection depends on circuit tolerance requirements.

Q: Is 1210-472J suitable for applications requiring operation below -40°C?

A: 1210-472J supports operation down to -55°C, matching the original PM20-4R7K specification. This part is suitable for extended low-temperature applications.

Q: Why do the CM322522 parts list "Nonstandard" as the package designation when dimensions match the 1210 footprint?

A: The CM322522 series uses a drum core, wirewound construction classified as nonstandard by the manufacturer, despite maintaining 1210 (3225 Metric) footprint compatibility. Physical dimensions and PCB mounting are compatible with standard 1210 land patterns.

Q: Which substitute offers the best overall compliance profile?

A: 74476404 (Würth Elektronik) combines ROHS3 compliance, active product status, exact current rating match (220 mA), reduced DC resistance (1.5Ohm), and standard 1210 package designation. Operating temperature is limited to -40°C minimum.

Q: Are there height clearance concerns when substituting 1210-472J?

A: 1210-472J has a maximum seated height of 0.101" (2.57mm), compared to 0.087" (2.20mm) for the original part. Verify PCB clearance and component placement constraints before selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message