PM638S-680-RC Equivalent & Substitute Parts

Part Overview

The PM638S-680-RC is a 68 µH shielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications requiring moderate current handling and low DC resistance. This component is classified as Active product status with full RoHS3 compliance. Substitute parts become necessary when primary inventory is unavailable, when alternative packaging configurations are required, or when supply chain optimization demands component consolidation across similar electrical specifications.

Key Parameters

Parameter	Value
Inductance	68 µH
Inductance Tolerance	±30%
Current Rating	750 mA
Current - Saturation (Isat)	870 mA
DC Resistance (DCR)	234 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Q Factor @ Frequency	7.4 @ 2.52 MHz
Self Resonant Frequency	7.5 MHz
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Physical Dimensions	0.268" L x 0.268" W (6.80 mm x 6.80 mm)
Height - Seated (Max)	0.157" (4.00 mm)
Packaging	Tape & Reel (TR)

Substitute Part Grouping Explanation

Substitution eligibility for the PM638S-680-RC is determined by strict equivalence across the following critical parameters:

Inductance value must match at 68 µH with identical ±30% tolerance specification. Current rating and saturation current must both be 750 mA and 870 mA respectively. DC resistance must not exceed 234 mOhm maximum. Shielding configuration must be shielded drum core construction with ferrite core material. Operating temperature range must span -40°C to 125°C minimum. Physical dimensions must be 6.80 mm x 6.80 mm with maximum seated height of 4.00 mm. Mounting type must be surface mount with tape and reel packaging.

The SRR6038-680Y meets all these criteria and qualifies as a direct electrical and mechanical equivalent.

Parameter Comparison

Parameter	PM638S-680-RC	SRR6038-680Y	Match Status
Inductance	68 µH	68 µH	Equivalent
Inductance Tolerance	±30%	±30%	Equivalent
Current Rating (Amps)	750 mA	750 mA	Equivalent
Current - Saturation (Isat)	870 mA	870 mA	Equivalent
DC Resistance (DCR)	234 mOhm Max	234 mOhm Max	Equivalent
Shielding	Shielded	Shielded	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Q @ Freq	7.4 @ 2.52 MHz	7.4 @ 2.52 MHz	Equivalent
Frequency - Self Resonant	7.5 MHz	7.5 MHz	Equivalent
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Physical Dimensions	6.80 mm x 6.80 mm	6.80 mm x 6.80 mm	Equivalent
Height - Seated (Max)	4.00 mm	4.00 mm	Equivalent
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Equivalent
Product Status	Active	Active	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Both PM638S-680-RC and SRR6038-680Y are Active status components with identical RoHS3 compliance certification and REACH unaffected status. Selection between these parts should be based on inventory availability and supply chain lead times. The SRR6038-680Y currently maintains higher stock levels at 2370 pieces compared to 1178 pieces for the PM638S-680-RC. Both components meet identical electrical performance requirements and physical form factor specifications, making them interchangeable at the circuit design level. No design modifications or re-qualification testing is required when substituting between these two part numbers.

Frequently Asked Questions (FAQ)

Q: Can SRR6038-680Y be used as a direct replacement for PM638S-680-RC in existing designs?

A: Yes. Both inductors share identical electrical specifications including 68 µH inductance, 750 mA current rating, 234 mOhm maximum DC resistance, and ferrite shielded drum core construction. Physical dimensions and mounting characteristics are identical, enabling direct PCB-level substitution without design changes.

Q: Are there any compliance or certification differences between these parts?

A: No. Both components carry identical RoHS3 compliance certification, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental compliance requirements are met equally by both part numbers.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by matching inductance value (68 µH), inductance tolerance (±30%), current rating (750 mA), saturation current (870 mA), DC resistance (234 mOhm max), core material (ferrite), shielding configuration (shielded), operating temperature range (-40°C to 125°C), physical dimensions (6.80 mm x 6.80 mm), and mounting type (surface mount). All these parameters must match exactly for parts to be considered equivalent.

Q: Are there any frequency response differences between PM638S-680-RC and SRR6038-680Y?

A: No. Both inductors exhibit identical Q factor (7.4 @ 2.52 MHz) and self-resonant frequency (7.5 MHz) characteristics. Frequency-dependent performance is equivalent across the operating bandwidth.

Q: What is the difference between the PM638S and SRR6038 series designations?

A: The series designation reflects Bourns Inc. internal product line categorization. PM638S and SRR6038 represent different product families within Bourns' inductor portfolio, but the specific models PM638S-680-RC and SRR6038-680Y are electrically and mechanically equivalent for this 68 µH application.

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