Equivalent & Substitute Parts for 337KXM050M

Part Overview

The 337KXM050M is a 330 µF, 50 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the KXM series. This radial, through-hole component is designed for general-purpose applications with a rated lifetime of 4000 hours at 105°C. The part is currently active in production and ROHS3 compliant. Substitute parts are identified to provide alternatives with equivalent electrical and mechanical specifications, extended operational life, or improved availability.

Key Parameters

Parameter	Specification
Capacitance	330 µF
Voltage Rating	50 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Maximum Height	1.063" (27.00 mm)
Operating Temperature Range	-55°C to 105°C
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the 337KXM050M is determined by strict equivalence in the following parameters:

Capacitance Value: 330 µF (exact match required)
Voltage Rating: 50 V (exact match required)
Tolerance: ±20% (exact match required)
Package Configuration: Radial, Can format with through-hole mounting
Physical Dimensions: Lead spacing of 0.197" (5.00 mm), case diameter of 0.394" (10.00 mm), and maximum seated height within compatible range
Operating Temperature Range: -55°C to 105°C (minimum requirement)
Polarization: Polar (exact match required)

The substitute part ELXZ500ELL331MJ25S meets all these criteria. Additional considerations include lifetime rating at 105°C, ESR characteristics, ripple current handling, and compliance certifications. The substitute demonstrates extended operational life and improved electrical performance while maintaining mechanical and electrical compatibility.

Parameter Comparison

Parameter	337KXM050M (Cornell Dubilier)	ELXZ500ELL331MJ25S (Chemi-Con)
Capacitance	330 µF	330 µF
Voltage Rating	50 V	50 V
Tolerance	±20%	±20%
Operating Temperature	-55°C to 105°C	-55°C to 105°C
Lifetime @ 105°C	4000 Hrs	5000 Hrs
ESR @ 120 Hz	502.4 mOhm	Not specified
Impedance	85 mOhms	73 mOhms
Ripple Current @ 120 Hz	935 mA	625 mA
Ripple Current @ 100 kHz	1.87 A	1.25 A
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)
Maximum Height	1.063" (27.00 mm)	1.043" (26.50 mm)
Package Type	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both the 337KXM050M and ELXZ500ELL331MJ25S are active production components with full ROHS3 compliance and REACH unaffected status. The substitute part ELXZ500ELL331MJ25S offers the following advantages:

Extended Lifetime: 5000 hours at 105°C compared to 4000 hours, providing 25% longer operational life under thermal stress
Lower Impedance: 73 mOhms versus 85 mOhms, resulting in improved high-frequency performance
Automotive Qualification: AEC-Q200 rating indicates suitability for automotive applications with enhanced reliability standards
Mechanical Compatibility: Maximum height of 1.043" (26.50 mm) is 0.020" lower than the original, ensuring fit within existing PCB layouts designed for the 337KXM050M

Selection between these parts depends on application requirements. The 337KXM050M remains suitable for general-purpose applications with standard reliability requirements. The ELXZ500ELL331MJ25S is appropriate for applications requiring extended thermal life, automotive-grade reliability, or improved impedance characteristics.

Frequently Asked Questions (FAQ)

Q: Can ELXZ500ELL331MJ25S be used as a direct replacement for 337KXM050M?

A: Yes. Both parts share identical capacitance (330 µF), voltage rating (50 V), tolerance (±20%), lead spacing (5.00 mm), case diameter (10.00 mm), and operating temperature range (-55°C to 105°C). Physical dimensions are compatible, with the substitute being 0.020" shorter in height.

Q: What are the key differences between these two parts?

A: The primary differences are lifetime rating (5000 hours versus 4000 hours at 105°C), impedance (73 mOhms versus 85 mOhms), and automotive qualification (AEC-Q200 for the substitute). Ripple current specifications differ, with the original part rated higher at both 120 Hz and 100 kHz.

Q: Are there any PCB layout considerations when substituting?

A: The substitute part is 0.020" shorter in maximum height. This presents no compatibility issues for existing designs. Lead spacing remains identical at 0.197" (5.00 mm), ensuring through-hole mounting compatibility without modification.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant and REACH unaffected. The substitute additionally carries AEC-Q200 automotive qualification.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For general-purpose applications, either part is suitable. For applications requiring extended thermal life or automotive-grade reliability, the ELXZ500ELL331MJ25S is appropriate.

Q: Are inventory levels a consideration?

A: The substitute part ELXZ500ELL331MJ25S has higher inventory availability (2939 pieces) compared to the original 337KXM050M (940 pieces), which may influence procurement decisions.

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