KMG50VB331M10X16LL Equivalent & Substitute Parts

Part Overview

The KMG50VB331M10X16LL is a 330 µF, 50 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMG series. This radial, through-hole component is designed for general-purpose applications with a rated lifetime of 1000 hours at 105°C. The part is currently classified as obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility for ongoing system support and new production alternatives.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	50 V
Tolerance	±20%
ESR @ 120 Hz	603 mOhm
Lifetime @ 105°C	1000 Hrs
Operating Temperature Range	-55°C to 105°C
Ripple Current @ 120 Hz	410 mA
Ripple Current @ 100 kHz	615 mA
Lead Spacing	0.197" (5.00 mm)
Diameter	0.394" (10.00 mm)
Height	0.630" (16.00 mm)
Mounting Type	Through Hole Radial
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the KMG50VB331M10X16LL is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 50 V (exact match required)
Tolerance: ±20% (exact match required)
Operating Temperature Range: -55°C to 105°C (exact match required)
Ripple Current Ratings: 410 mA @ 120 Hz and 615 mA @ 100 kHz (exact match required)

Mechanical Equivalence Criteria:

Lead Spacing: 0.197" (5.00 mm) (exact match required)
Diameter: 0.394" (10.00 mm) (exact match required)
Mounting Type: Through Hole Radial (exact match required)
Package/Case: Radial, Can (exact match required)

Acceptable Variations:

Height: Substitute parts with height up to 0.689" (17.50 mm) are acceptable, provided PCB layout accommodates the increased dimension
ESR: Variations in ESR are acceptable when not specified in substitute data
Lifetime @ 105°C: Substitute parts with equal or greater lifetime (1000 Hrs or higher) are acceptable
Product Status: Active or Not For New Designs status does not disqualify electrical/mechanical equivalence
RoHS Compliance: Substitute parts with improved compliance (RoHS3) are acceptable

Parameter Comparison

Parameter	KMG50VB331M10X16LL	EKMG500ELL331MJ16S	UKT1H331MPD	UVZ1H331MPD
Manufacturer	Chemi-Con	Chemi-Con	Nichicon	Nichicon
Series	KMG	KMG	UKT	UVZ
Capacitance	330 µF	330 µF	330 µF	330 µF
Voltage Rating	50 V	50 V	50 V	50 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ 105°C	1000 Hrs	1000 Hrs	1000 Hrs	2000 Hrs
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Ripple Current @ 120 Hz	410 mA	410 mA	410 mA	410 mA
Ripple Current @ 100 kHz	615 mA	615 mA	Not Specified	Not Specified
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Height (Max)	0.630" (16.00 mm)	0.689" (17.50 mm)	0.630" (16.00 mm)	0.689" (17.50 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package/Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Polarization	Polar	Polar	Polar	Polar
Product Status	Obsolete	Active	Not For New Designs	Not For New Designs
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

EKMG500ELL331MJ16S (Chemi-Con KMG Series)

This substitute is the primary equivalent for the KMG50VB331M10X16LL. Both components are from the same manufacturer and series, ensuring design continuity. The EKMG500ELL331MJ16S maintains all critical electrical parameters and mechanical dimensions. The part is currently in active production status, providing long-term supply availability. RoHS3 compliance offers regulatory advantage over the original obsolete part. Height increase to 0.689" (17.50 mm) requires PCB layout verification but does not affect electrical performance. This part is recommended for direct replacement in existing designs and new production.

UKT1H331MPD (Nichicon UKT Series)

This Nichicon substitute provides electrical and mechanical equivalence with identical height to the original part (0.630"). The UKT series is classified as Not For New Designs, indicating limited future availability. RoHS3 compliance is present. This part is suitable for legacy system repairs where exact height matching is critical and supply of the original KMG part is unavailable. The UKT1H331MPD is not recommended for new design implementations.

UVZ1H331MPD (Nichicon UVZ Series)

This Nichicon substitute offers extended lifetime rating of 2000 hours at 105°C, compared to the 1000-hour specification of the original part. All electrical parameters match the KMG50VB331M10X16LL. Height is increased to 0.689" (17.50 mm), requiring PCB layout confirmation. The UVZ series is classified as Not For New Designs. RoHS3 compliance is present. This part is suitable for applications requiring enhanced thermal endurance in legacy system support scenarios where PCB space permits the increased height.

Frequently Asked Questions (FAQ)

Q: Can EKMG500ELL331MJ16S be used as a direct replacement for KMG50VB331M10X16LL?

A: Yes. The EKMG500ELL331MJ16S is electrically and mechanically equivalent. All critical parameters—capacitance, voltage rating, tolerance, operating temperature range, and ripple current specifications—are identical. The height difference (0.689" versus 0.630") must be verified against PCB layout constraints. This part is recommended for replacement.

Q: What is the significance of the height difference between substitute parts?

A: The KMG50VB331M10X16LL has a maximum seated height of 0.630" (16.00 mm). Substitute parts EKMG500ELL331MJ16S and UVZ1H331MPD have heights of 0.689" (17.50 mm). This 0.059" (1.50 mm) increase must be evaluated against available PCB clearance, component spacing, and enclosure dimensions. If PCB layout accommodates this dimension, the substitutes are mechanically compatible.

Q: Are there differences in ESR between the main part and substitutes?

A: The KMG50VB331M10X16LL specifies ESR of 603 mOhm @ 120 Hz. Substitute parts do not provide ESR specifications in the available data. ESR variations between manufacturers and series are normal within the aluminum electrolytic capacitor category. If ESR is a critical design parameter, ESR specifications for substitute parts must be obtained from manufacturer datasheets before final selection.

Q: Why is the KMG50VB331M10X16LL classified as obsolete?

A: Obsolescence indicates the part is no longer in active production. The EKMG500ELL331MJ16S, from the same KMG series and manufacturer, is currently in active production and provides equivalent functionality, making it the recommended replacement for ongoing supply requirements.

Q: What is the difference between "Not For New Designs" and "Active" product status?

A: "Active" status indicates the part is in current production and recommended for new designs. "Not For New Designs" indicates the part remains available but is being phased out; it is suitable for legacy system support and repairs but should not be selected for new product development. The EKMG500ELL331MJ16S (Active status) is preferred for new designs.

Q: Can UVZ1H331MPD be used in applications requiring extended thermal life?

A: Yes. The UVZ1H331MPD provides 2000 hours lifetime at 105°C, compared to 1000 hours for the original part. This extended rating is suitable for applications with demanding thermal environments. However, the part is classified as Not For New Designs. PCB layout must accommodate the 0.689" (17.50 mm) height.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (EKMG500ELL331MJ16S, UKT1H331MPD, and UVZ1H331MPD) are RoHS3 compliant. The original KMG50VB331M10X16LL is RoHS non-compliant. Substitution provides regulatory compliance improvement for systems subject to RoHS requirements.

Q: What parameters must remain identical for substitution to be valid?

A: Capacitance (330 µF), voltage rating (50 V), tolerance (±20%), operating temperature range (-55°C to 105°C), ripple current specifications (410 mA @ 120 Hz, 615 mA @ 100 kHz), lead spacing (0.197"/5.00 mm), diameter (0.394"/10.00 mm), and mounting type (through-hole radial) must all match exactly. These parameters determine electrical and mechanical compatibility.

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