KY50VB331M10X25LL Equivalent & Substitute Parts

Part Overview

The KY50VB331M10X25LL is a 330 µF, 50 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 requiring stable capacitance and ripple current handling. The part is currently active in production and available in bulk packaging with 962 units in stock.

Substitute parts are necessary when the original KY50VB331M10X25LL becomes unavailable, when design requirements demand extended operational lifetime, improved compliance status, or when higher ripple current capability is required for circuit optimization.

Substiute Parts

KY50VB331M10X25LL

Chemi-ConIn Stock: 1012KY50VB331M10X25LL Datasheet

Current PartRFQ

EKY-500ELL331MJ25S

Chemi-ConIn Stock: 2609EKY-500ELL331MJ25S Datasheet

UpgradeRFQ

50ZLH330MEFC10X23

RubyconIn Stock: 1276150ZLH330MEFC10X23 Datasheet

UpgradeRFQ

63ZLH330MEFC10X23

RubyconIn Stock: 2751263ZLH330MEFC10X23 Datasheet

UpgradeRFQ

UHE1H331MPD

NichiconIn Stock: 11585UHE1H331MPD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KY50VB331M10X25LL is determined by the following critical parameters:

Primary Substitution Criteria:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 50 V minimum (equal or higher voltage acceptable)
• Polarization: Polar (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can (exact match required)
• Lead Spacing: 5.00 mm (exact match required)
• Diameter: 10.00 mm (exact match required)

Secondary Substitution Criteria (Performance Enhancement):

• Lifetime @ 105°C: 7000 hours minimum
• Operating Temperature Range: -40°C to 105°C minimum
• Ripple Current Capability: Equal or greater than specified values
• Impedance: Lower impedance values indicate improved performance

Substitute parts are classified into two categories:

Upgrade Substitutes: Parts that maintain all primary criteria while offering enhanced performance characteristics (extended lifetime, improved ripple current, lower impedance, or improved compliance status).

Parametric Equivalents: Parts that match all primary criteria and performance specifications but may have different product status or compliance designations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile):

The EKY-500ELL331MJ25S from Chemi-Con is the primary direct substitute. It maintains identical electrical specifications (330 µF, 50 V, 7000 Hrs @ 105°C) and mechanical dimensions as the KY50VB331M10X25LL. The only dimensional difference is a maximum seated height of 26.50 mm versus 25.00 mm. This part achieves ROHS3 compliance, addressing regulatory requirements where the original part does not. Product status is Active, ensuring long-term availability.

For Enhanced Reliability (Extended Lifetime):

The 50ZLH330MEFC10X23 from Rubycon provides a 43% increase in operational lifetime (10000 hours versus 7000 hours at 105°C) while maintaining the 50 V voltage rating and identical mechanical footprint. This part delivers superior ripple current performance (1.029 A @ 120 Hz and 1.87 A @ 100 kHz) and significantly lower impedance (28 mOhms versus 55 mOhms), resulting in reduced heat generation and improved circuit stability. ROHS3 compliance is included. Inventory availability is substantial at 12716 units.

For Voltage Margin (Higher Voltage Rating):

The 63ZLH330MEFC10X23 from Rubycon provides a 26% voltage margin above the original 50 V specification while maintaining 330 µF capacitance and identical mechanical dimensions. This part also offers 10000-hour lifetime at 105°C and ROHS3 compliance. The higher voltage rating provides additional safety margin in applications subject to voltage transients or supply variations. Inventory availability is the highest among all substitutes at 27476 units.

For Parametric Equivalence (Legacy Designs):

The UHE1H331MPD from Nichicon matches all primary electrical and mechanical specifications of the KY50VB331M10X25LL. However, this part carries a "Not For New Designs" product status and is affected by REACH regulations. This part is suitable only for sustaining production of existing designs where component qualification has already been completed and design changes are not feasible.

Frequently Asked Questions (FAQ)

Q: Can the EKY-500ELL331MJ25S be used as a direct drop-in replacement for the KY50VB331M10X25LL?

A: The EKY-500ELL331MJ25S is electrically and mechanically compatible with the KY50VB331M10X25LL. The maximum seated height difference is 1.50 mm (26.50 mm versus 25.00 mm). Verify that the PCB layout and enclosure clearances accommodate this height increase before implementation.

Q: What is the advantage of selecting the 50ZLH330MEFC10X23 over the original part?

A: The 50ZLH330MEFC10X23 offers three primary advantages: (1) Extended operational lifetime of 10000 hours at 105°C compared to 7000 hours, (2) Superior ripple current capability with 43% higher performance at 120 Hz and 30% higher at 100 kHz, and (3) Lower impedance (28 mOhms versus 55 mOhms) resulting in reduced thermal stress. All mechanical dimensions remain identical.

Q: Is the 63ZLH330MEFC10X23 suitable for circuits designed for 50 V operation?

A: Yes. The 63ZLH330MEFC10X23 is rated for 63 V operation, which exceeds the 50 V requirement of the original design. Higher voltage-rated capacitors are backward-compatible with lower voltage circuits. The 26% voltage margin provides additional protection against transient overvoltages. All other electrical parameters (capacitance, tolerance, temperature range) remain equivalent.

Q: Why is the UHE1H331MPD marked "Not For New Designs"?

A: The "Not For New Designs" designation indicates that the manufacturer (Nichicon) has discontinued active development and marketing of this part for new applications. While the part remains available for sustaining existing production, it is not recommended for new circuit designs. Additionally, this part is REACH-affected, which may introduce regulatory compliance considerations.

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

A: RoHS3 compliance certifies that the component meets Restriction of Hazardous Substances regulations, restricting the use of lead, cadmium, mercury, and other hazardous materials. The original KY50VB331M10X25LL is RoHS non-compliant. All substitute parts (EKY-500ELL331MJ25S, 50ZLH330MEFC10X23, 63ZLH330MEFC10X23, and UHE1H331MPD) are ROHS3 compliant, making them suitable for applications subject to environmental and regulatory requirements.

Q: Can height differences between substitute parts affect PCB assembly?

A: Yes. The EKY-500ELL331MJ25S has a maximum seated height of 26.50 mm compared to 25.00 mm for the original part. This 1.50 mm difference may affect wave soldering profiles, conformal coating processes, or enclosure clearances. Verify PCB layout and manufacturing process parameters before substitution. The 50ZLH330MEFC10X23 and 63ZLH330MEFC10X23 maintain the original 25.00 mm height and do not introduce this consideration.

Q: How does impedance affect circuit performance?

A: Impedance directly influences the capacitor's ability to supply ripple current and respond to transient voltage changes. Lower impedance values (such as 28 mOhms in the 50ZLH330MEFC10X23) result in reduced voltage drop across the capacitor during high-frequency current transients and lower heat dissipation. Higher impedance values (such as 69 mOhms in the 63ZLH330MEFC10X23) may increase thermal stress in high-ripple-current applications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in bulk packaging with through-hole radial can configuration, identical lead spacing (5.00 mm), and identical diameter (10.00 mm). Packaging format compatibility is confirmed across all substitutes.