686LMB450M2BD Equivalent & Substitute Parts Reference

Part Overview

The 686LMB450M2BD is a 68 µF, 450 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMB series. This radial, can-style snap-in capacitor is designed for general-purpose applications with a rated lifetime of 3000 hours at 105°C and an operating temperature range of -25°C to 105°C. The part is currently in active product status with 753 pieces in stock.

Equivalent and substitute parts are identified based on matching core electrical specifications: capacitance value (68 µF), voltage rating (450 V or higher), tolerance (±20%), polarization (polar), package type (radial, can - snap-in), and mechanical dimensions (0.866" diameter, 1.260" maximum height, 0.394" lead spacing). Substitutes must maintain through-hole mounting compatibility and comply with RoHS3 and REACH requirements.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	68	µF	Critical - must match exactly
Voltage - Rated	450	V	Critical - substitute must meet or exceed
Tolerance	±20%	-	Critical - must match
Polarization	Polar	-	Critical - must match
Package / Case	Radial, Can - Snap-In	-	Critical - must match for mechanical fit
Lead Spacing	0.394" (10.00 mm)	-	Critical - must match for PCB compatibility
Size / Dimension	0.866" Dia (22.00 mm)	-	Critical - must match for mechanical clearance
Height - Seated (Max)	1.260" (32.00 mm)	-	Critical - must match for vertical clearance
Mounting Type	Through Hole	-	Critical - must match
Lifetime @ Temp.	3000	Hrs @ 105°C	Important - affects reliability
Operating Temperature	-25°C ~ 105°C	-	Important - must support application range
RoHS Status	ROHS3 Compliant	-	Regulatory - must match

Substitute Part Grouping Explanation

Substitution logic for the 686LMB450M2BD is based on the following criteria:

Critical Matching Parameters:

Capacitance: 68 µF (exact match required)
Voltage Rating: 450 V minimum (equal or higher acceptable)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" / 10.00 mm (exact match required)
Physical Dimensions: 0.866" diameter / 22.00 mm, 1.260" height / 32.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Lifetime at 105°C: 3000 hours minimum
Operating Temperature Range: Must support -25°C to 105°C minimum
RoHS3 Compliance: Required
REACH Status: Unaffected (required)

All identified substitutes meet these criteria. Differences in ESR (Equivalent Series Resistance), ripple current ratings, and product status are noted but do not disqualify substitution eligibility when core parameters align.

Parameter Comparison

Parameter	686LMB450M2BD (Cornell Dubilier)	B43504A5686M000 (EPCOS - TDK)	B43509A5686M000 (EPCOS - TDK)	LGX2H680MELZ30 (Nichicon)
Capacitance	68 µF	68 µF	68 µF	68 µF
Voltage - Rated	450 V	450 V	450 V	500 V
Tolerance	±20%	±20%	±20%	±20%
Polarization	Polar	Polar	Polar	Polar
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Dimension	0.866" Dia (22.00 mm)	0.866" Dia (22.00 mm)	0.866" Dia (22.00 mm)	0.866" Dia (22.00 mm)
Height - Seated (Max)	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Lifetime @ Temp.	3000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C	5000 Hrs @ 105°C
Operating Temperature	-25°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-25°C ~ 105°C
ESR @ Reference Frequency	6.09509 Ohm @ 120 Hz	1.99 Ohm @ 100 Hz	1.4 Ohm @ 100 Hz	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Not For New Designs	Active	Active

Engineering Selection Recommendations

Direct Substitutes (Equal Voltage Rating - 450 V):

B43504A5686M000 (EPCOS - TDK Electronics): This part meets all critical electrical and mechanical parameters. However, it carries a "Not For New Designs" product status, indicating that EPCOS - TDK Electronics has designated this part as obsolete or transitional. Use this substitute only for legacy system maintenance or repair applications where the original part is unavailable. For new designs, alternative active-status parts are preferred.

B43509A5686M000 (EPCOS - TDK Electronics): This part is the recommended direct substitute. It matches all critical specifications and carries an "Active" product status, confirming ongoing manufacturer support and availability. The lower ESR (1.4 Ohm @ 100 Hz compared to 6.09509 Ohm @ 120 Hz in the original) indicates improved electrical performance characteristics. The extended operating temperature range (-40°C to 105°C versus -25°C to 105°C) provides additional thermal margin.

Upgrade Substitute (Higher Voltage Rating - 500 V):

LGX2H680MELZ30 (Nichicon): This part provides a voltage rating upgrade from 450 V to 500 V while maintaining all other critical specifications. The extended lifetime rating of 5000 hours at 105°C (versus 3000 hours) represents improved reliability. This part is suitable for applications requiring enhanced voltage margin or extended operational life. The higher voltage rating does not create compatibility issues in circuits designed for 450 V operation.

Compliance and Regulatory Status:

All identified substitutes comply with RoHS3 requirements and maintain REACH Unaffected status, matching the regulatory profile of the original 686LMB450M2BD. Selection among these substitutes should prioritize product status (Active preferred over Not For New Designs) and application-specific requirements for voltage margin and lifetime.

Frequently Asked Questions (FAQ)

Q: Can B43504A5686M000 be used as a direct replacement for 686LMB450M2BD?

A: B43504A5686M000 meets all critical electrical and mechanical specifications. However, its "Not For New Designs" status indicates manufacturer phase-out. It is suitable for repair and maintenance of existing systems but not recommended for new product designs.

Q: What is the difference between B43504A5686M000 and B43509A5686M000?

A: Both parts are 68 µF, 450 V aluminum electrolytic capacitors with identical mechanical dimensions and lead spacing. The primary differences are: B43509A5686M000 has lower ESR (1.4 Ohm versus 1.99 Ohm), carries "Active" product status (versus "Not For New Designs"), and has extended operating temperature range (-40°C to 105°C versus -40°C to 105°C). B43509A5686M000 is the preferred choice for new designs.

Q: Why is LGX2H680MELZ30 listed as an upgrade substitute?

A: LGX2H680MELZ30 provides a 500 V voltage rating compared to the original 450 V specification. This higher voltage rating offers additional safety margin in high-voltage applications. The extended lifetime of 5000 hours at 105°C (versus 3000 hours) improves long-term reliability. All other critical parameters remain identical, ensuring mechanical and electrical compatibility.

Q: Can I use a 500 V rated capacitor in a circuit designed for 450 V?

A: Yes. A higher voltage-rated capacitor is electrically compatible with circuits designed for lower voltage operation. The 500 V rating of LGX2H680MELZ30 does not create any functional issues when used in a 450 V application. This substitution is considered an upgrade.

Q: Are all substitutes mechanically identical to the original 686LMB450M2BD?

A: Yes. All identified substitutes share identical mechanical specifications: 0.866" diameter (22.00 mm), 1.260" maximum seated height (32.00 mm), 0.394" lead spacing (10.00 mm), and radial, can-style snap-in package. They are directly interchangeable on PCBs designed for the original part.

Q: What does "Not For New Designs" mean for B43504A5686M000?

A: This designation indicates that the manufacturer (EPCOS - TDK Electronics) has discontinued active development and promotion of this part. While existing inventory may be available, the manufacturer does not recommend its use in new product designs. This part should be reserved for repair, maintenance, and legacy system support only.

Q: Do all substitutes comply with RoHS3 and REACH requirements?

A: Yes. All identified substitutes—B43504A5686M000, B43509A5686M000, and LGX2H680MELZ30—are RoHS3 Compliant and REACH Unaffected, matching the regulatory compliance profile of the original 686LMB450M2BD.

Q: How do ESR differences affect circuit performance?

A: ESR (Equivalent Series Resistance) affects ripple current handling and heat dissipation. Lower ESR values (such as 1.4 Ohm in B43509A5686M000) indicate better performance in high-ripple-current applications. The original 686LMB450M2BD has higher ESR (6.09509 Ohm), which may be acceptable for general-purpose applications but represents a performance difference when substituting with lower-ESR alternatives.

Q: Which substitute should I choose for a new design?

A: For new designs, B43509A5686M000 is the recommended choice. It carries "Active" product status, ensuring long-term availability and manufacturer support. If your application requires higher voltage margin or extended operational life, LGX2H680MELZ30 is the preferred upgrade option.

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