PM3340-331M Equivalent & Substitute Parts

Part Overview

The Bourns PM3340-331M is a 330 µH unshielded drum core wirewound inductor rated for 600 mA with a maximum DC resistance of 700mOhm. This surface mount component operates across -55°C to 105°C and is classified as obsolete. Due to its obsolete status, identifying equivalent substitute parts with compatible electrical and mechanical specifications is essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Inductance	330 µH
Tolerance	±20%
Current Rating	600 mA
DC Resistance (DCR)	700mOhm Max
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 105°C
Package Type	Nonstandard

Substitute Part Grouping Explanation

Substitute parts for the PM3340-331M are qualified based on the following electrical and mechanical parameters:

Inductance value: 330 µH (exact match required)
Tolerance: ±20% (matching specification)
Shielding configuration: Unshielded (matching specification)
Mounting type: Surface Mount (matching specification)
DC Resistance: Must not exceed 700mOhm Max
Current Rating: Must meet or exceed 600 mA minimum
Package dimensions: Compatible with 0.512" L x 0.402" W footprint and 0.453" maximum height

The substitute parts identified below satisfy these core electrical and mechanical requirements while offering improved or equivalent performance characteristics.

Parameter Comparison

Parameter	PM3340-331M (Bourns)	PF0698.334NLT (Pulse Electronics)	PF0382.334NLT (Pulse Electronics)
Inductance	330 µH	330 µH	330 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	600 mA	950 mA	800 mA
Current - Saturation (Isat)	1.2A	1.35A	1.35A
DC Resistance (DCR)	700mOhm Max	580mOhm Max	580mOhm Max
Shielding	Unshielded	Unshielded	Unshielded
Operating Temperature	-55°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.512" L x 0.402" W (13.00mm x 10.20mm)	0.510" L x 0.370" W (12.95mm x 9.40mm)	0.510" L x 0.370" W (12.95mm x 9.40mm)
Height - Seated (Max)	0.453" (11.50mm)	0.445" (11.30mm)	0.445" (11.30mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both Pulse Electronics substitute parts satisfy the core electrical requirements of the PM3340-331M. The PF0698.334NLT and PF0382.334NLT offer improved DC resistance specifications (580mOhm Max versus 700mOhm Max) and higher current ratings (950 mA and 800 mA respectively versus 600 mA), providing enhanced performance margins.

The substitute parts are active products with ROHS3 compliance, addressing regulatory requirements that the obsolete PM3340-331M does not meet. Dimensional compatibility is maintained within acceptable tolerances for surface mount assembly.

Selection between PF0698.334NLT and PF0382.334NLT depends on application current requirements. The PF0698.334NLT provides maximum current capacity at 950 mA, while the PF0382.334NLT offers 800 mA rating. Both are suitable for applications requiring 600 mA or less.

Frequently Asked Questions (FAQ)

Q: Can PF0698.334NLT or PF0382.334NLT be used as direct replacements for PM3340-331M?

A: Yes. Both substitute parts match the critical electrical parameters: 330 µH inductance, ±20% tolerance, unshielded configuration, and surface mount package. Dimensional differences are minimal and within acceptable assembly tolerances.

Q: What are the key differences between the two substitute options?

A: The primary difference is current rating. PF0698.334NLT is rated for 950 mA, while PF0382.334NLT is rated for 800 mA. Both exceed the original 600 mA requirement. DC resistance is identical at 580mOhm Max for both parts.

Q: Does the lower DC resistance of substitute parts affect circuit performance?

A: Lower DC resistance (580mOhm versus 700mOhm) reduces resistive losses in the inductor, which is a performance improvement. This change is within normal component variation and does not introduce incompatibility.

Q: Are there temperature range considerations when substituting?

A: The substitute parts operate across -40°C to 125°C, compared to the original -55°C to 105°C. For applications requiring operation below -40°C or above 125°C, the original temperature range must be verified as a design requirement.

Q: What is the significance of RoHS3 compliance on the substitute parts?

A: RoHS3 compliance indicates the substitute parts meet current environmental and regulatory standards. The original PM3340-331M is RoHS non-compliant, making the compliant substitutes preferable for new designs and procurement.

Q: Are package dimensions identical between the original and substitute parts?

A: Dimensions are nearly identical with minor variations. Original: 0.512" L x 0.402" W x 0.453" H. Substitutes: 0.510" L x 0.370" W x 0.445" H. These differences are within standard PCB layout tolerances for surface mount assembly.

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