Equivalent & Substitute Parts for KY25VB331M8X15LL

Part Overview

The KY25VB331M8X15LL is a 330 µF, 25 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KY series. This radial, through-hole component is rated for 7000 hours at 105°C and is designed for general-purpose applications. The part is currently obsolete, making equivalent and substitute components necessary for ongoing system support, repairs, and new production alternatives.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	25 V
Tolerance	±20%
Lifetime @ 105°C	7000 Hrs
Operating Temperature Range	-40°C ~ 105°C
Lead Spacing	0.138" (3.50 mm)
Case Diameter	0.315" (8.00 mm)
Height	0.591" (15.00 mm)
Mounting Type	Through Hole, Radial
Polarization	Polar

Substitute Part Grouping Explanation

Substitution for the KY25VB331M8X15LL is determined by strict equivalence in the following parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 25 V (exact match required)
Tolerance: ±20% (exact match required)
Lead Spacing: 0.138" (3.50 mm) (exact match required for PCB compatibility)
Case Diameter: 0.315" (8.00 mm) (exact match required for mechanical fit)
Mounting Type: Through Hole, Radial (exact match required)
Polarization: Polar (exact match required)

Substitute parts are grouped into three categories based on product status and performance characteristics:

Direct Substitutes (Active Status): EKYB250ELL331MHB5D, EKZM250ELL331MHB5D, 25ZLH330MEFC8X11.5, ESL337M025AGMAA

Upgrade Option (Enhanced Lifetime): EEU-EB1E331

Parametric Equivalent (Legacy Status): UHE1E331MPD

All substitute parts maintain identical electrical specifications (capacitance, voltage, tolerance) and mechanical dimensions (lead spacing, case diameter, mounting configuration) as the original KY25VB331M8X15LL.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Lead Spacing	Case Dia	Height	Product Status	RoHS Status
KY25VB331M8X15LL	Chemi-Con	KY	330 µF	25 V	±20%	7000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.591" (15.00 mm)	Obsolete	Non-compliant
EKYB250ELL331MHB5D	Chemi-Con	KYB	330 µF	25 V	±20%	7000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.512" (13.00 mm)	Active	ROHS3 Compliant
EKZM250ELL331MHB5D	Chemi-Con	KZM	330 µF	25 V	±20%	8000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.512" (13.00 mm)	Active	ROHS3 Compliant
25ZLH330MEFC8X11.5	Rubycon	ZLH	330 µF	25 V	±20%	8000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.512" (13.00 mm)	Active	ROHS3 Compliant
ESL337M025AGMAA	KEMET	ESL	330 µF	25 V	±20%	10000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.531" (13.50 mm)	Active	ROHS3 Compliant
EEU-EB1E331	Panasonic Electronic Components	EB-A	330 µF	25 V	±20%	10000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.630" (16.00 mm)	Active	ROHS3 Compliant
UHE1E331MPD	Nichicon	UHE	330 µF	25 V	±20%	7000 Hrs	0.138" (3.50 mm)	0.315" (8.00 mm)	0.591" (15.00 mm)	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement in Active Production:

EKYB250ELL331MHB5D (Chemi-Con KYB series) is the primary direct substitute. It maintains identical electrical specifications and mechanical lead spacing as the KY25VB331M8X15LL. The part is ROHS3 compliant and in active production status. Height is reduced to 0.512" (13.00 mm), which may require PCB layout verification for clearance compatibility.

For Enhanced Reliability:

EKZM250ELL331MHB5D (Chemi-Con KZM series) and 25ZLH330MEFC8X11.5 (Rubycon ZLH series) both offer 8000-hour lifetime ratings at 105°C, compared to the original 7000-hour specification. Both are ROHS3 compliant and active production parts. ESL337M025AGMAA (KEMET ESL series) provides the highest lifetime rating at 10000 hours with ROHS3 compliance.

For Maximum Height Compatibility:

EEU-EB1E331 (Panasonic EB-A series) matches the original height of 0.591" (15.00 mm) most closely at 0.630" (16.00 mm), providing the best mechanical fit for legacy PCB designs. This part offers 10000-hour lifetime and ROHS3 compliance.

For Legacy System Support:

UHE1E331MPD (Nichicon UHE series) is electrically and mechanically equivalent to the original part with matching 7000-hour lifetime and 0.591" height. However, this part is designated "Not For New Designs" and carries REACH Affected status. Use only for repair and maintenance of existing systems.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different height?

A: Height differences must be evaluated against PCB clearance requirements. EKYB250ELL331MHB5D, EKZM250ELL331MHB5D, and 25ZLH330MEFC8X11.5 are 0.512" (13.00 mm) tall, compared to the original 0.591" (15.00 mm). ESL337M025AGMAA is 0.531" (13.50 mm). EEU-EB1E331 is 0.630" (16.00 mm). Verify PCB layout clearance before substitution.

Q: Are all substitute parts RoHS compliant?

A: All active production substitutes (EKYB250ELL331MHB5D, EKZM250ELL331MHB5D, 25ZLH330MEFC8X11.5, ESL337M025AGMAA, EEU-EB1E331) are ROHS3 compliant. The original KY25VB331M8X15LL is RoHS non-compliant. UHE1E331MPD is ROHS3 compliant but not recommended for new designs.

Q: What is the difference between direct substitutes and upgrade options?

A: Direct substitutes maintain the original 7000-hour lifetime specification. Upgrade options (EKZM250ELL331MHB5D, 25ZLH330MEFC8X11.5, ESL337M025AGMAA, EEU-EB1E331) provide extended lifetime ratings of 8000 to 10000 hours at 105°C, improving system reliability without changing electrical or mechanical compatibility.

Q: Can I use UHE1E331MPD in new designs?

A: UHE1E331MPD is designated "Not For New Designs" by Nichicon. This part is suitable only for repair and maintenance of existing systems. For new production, use active status alternatives: EKYB250ELL331MHB5D, EKZM250ELL331MHB5D, 25ZLH330MEFC8X11.5, ESL337M025AGMAA, or EEU-EB1E331.

Q: Do all substitutes have the same lead spacing?

A: Yes. All substitute parts maintain 0.138" (3.50 mm) lead spacing, identical to the original KY25VB331M8X15LL. This ensures direct PCB footprint compatibility without layout modifications.

Q: What is the REACH status difference between parts?

A: Most substitute parts are REACH Unaffected. UHE1E331MPD is REACH Affected. For applications subject to REACH compliance requirements, use EKYB250ELL331MHB5D, EKZM250ELL331MHB5D, 25ZLH330MEFC8X11.5, ESL337M025AGMAA, or EEU-EB1E331.

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