KMG25VB331M8X11LL Equivalent & Substitute Parts

Part Overview

The KMG25VB331M8X11LL is a 330 µF, 25 V aluminum electrolytic capacitor manufactured by Chemi-Con in radial, can package configuration. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for applications utilizing this capacitor specification.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	25 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.138" (3.50 mm)
Case Diameter	0.315" (8.00 mm)
Lifetime Rating	1000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Polarization	Polar

Substitute Part Grouping Explanation

Substitute parts for the KMG25VB331M8X11LL are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 25 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime: 1000 Hrs @ 105°C (exact match required)
Operating Temperature Range: -55°C ~ 105°C (exact match required)
Polarization: Polar (exact match required)

Mechanical Parameters:

Package Type: Radial, Can (exact match required)
Mounting Type: Through Hole (exact match required)
Lead Spacing: 0.138" (3.50 mm) (exact match required)
Case Diameter: 0.315" (8.00 mm) (exact match required)

Substitute parts meeting all electrical and mechanical parameters are classified as direct equivalents. Variations in height, ESR specifications, or ripple current ratings do not disqualify substitution when all primary parameters align.

Parameter Comparison

Parameter	KMG25VB331M8X11LL (Chemi-Con)	UKT1E331MPD (Nichicon)	ECA-1EHG331 (Panasonic)
Capacitance	330 µF	330 µF	330 µF
Voltage Rating	25 V	25 V	25 V
Tolerance	±20%	±20%	±20%
Package Type	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
Lead Spacing	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)
Case Diameter	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)
Height - Seated (Max)	0.453" (11.50 mm)	0.453" (11.50 mm)	0.492" (12.50 mm)
Lifetime @ Temp.	1000 Hrs @ 105°C	1000 Hrs @ 105°C	1000 Hrs @ 105°C
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Polarization	Polar	Polar	Polar
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

UKT1E331MPD (Nichicon): This part meets all electrical and mechanical substitution criteria. The product status is classified as "Not For New Designs," indicating limited future availability. RoHS3 compliance provides regulatory advantage over the original KMG25VB331M8X11LL. Inventory availability is 2,364 pieces. Height dimension matches the original specification at 0.453" (11.50 mm), ensuring direct PCB compatibility without layout modification.

ECA-1EHG331 (Panasonic): This part meets all electrical and mechanical substitution criteria with the exception of height dimension, which is 0.492" (12.50 mm) compared to the original 0.453" (11.50 mm). The additional 0.039" (1.00 mm) height requires verification of available clearance in the target application. Product status is Active, indicating ongoing manufacturer support and long-term availability. RoHS3 compliance is confirmed. Inventory availability is 119,223 pieces, providing superior supply chain security. Ripple current specifications match the original part exactly at 310 mA @ 120 Hz and 465 mA @ 100 kHz.

Frequently Asked Questions (FAQ)

Q: Can UKT1E331MPD be used as a direct replacement for KMG25VB331M8X11LL?

A: Yes. UKT1E331MPD meets all electrical and mechanical parameters. Dimensions are identical, including lead spacing (0.138" / 3.50 mm), case diameter (0.315" / 8.00 mm), and height (0.453" / 11.50 mm). No PCB layout modification is required.

Q: What is the height difference between ECA-1EHG331 and the original KMG25VB331M8X11LL?

A: ECA-1EHG331 has a maximum seated height of 0.492" (12.50 mm), compared to 0.453" (11.50 mm) for the original part. The difference is 0.039" (1.00 mm). Clearance verification is necessary before implementation.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both UKT1E331MPD and ECA-1EHG331 are ROHS3 compliant. The original KMG25VB331M8X11LL is RoHS non-compliant.

Q: Which substitute part has better long-term availability?

A: ECA-1EHG331 has Active product status, indicating ongoing manufacturer support. UKT1E331MPD is classified as "Not For New Designs," suggesting limited future availability. For new designs or long-term production, ECA-1EHG331 is the preferred selection.

Q: Do the substitute parts have identical ripple current ratings?

A: UKT1E331MPD has ripple current ratings of 290 mA @ 120 Hz and 435 mA @ 10 kHz. ECA-1EHG331 has ripple current ratings of 310 mA @ 120 Hz and 465 mA @ 100 kHz, matching the original KMG25VB331M8X11LL exactly. ESR data for UKT1E331MPD is not provided.

Q: Can these parts be used interchangeably in existing designs?

A: UKT1E331MPD provides direct interchangeability without modification. ECA-1EHG331 requires clearance verification due to the 1.00 mm height increase. Both parts maintain identical lead spacing and case diameter, ensuring PCB footprint compatibility.

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