B43231B9826M Equivalent & Substitute Parts

Part Overview

The B43231B9826M is an 82 µF, 400 V aluminum electrolytic capacitor manufactured by EPCOS - TDK Electronics. This radial, can-style snap-in component is designed for general-purpose applications requiring reliable energy storage and filtering in power supply circuits. The part is currently active in production with 817 units in stock. Equivalent and substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements allow for upgraded electrical characteristics within the same mechanical footprint.

Substiute Parts

B43231B9826M

EPCOS - TDK ElectronicsIn Stock: 834B43231B9826M Datasheet

Current PartRFQ

ESMM451VSN820MQ20S

Chemi-ConIn Stock: 2031ESMM451VSN820MQ20S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B43231B9826M is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Capacitance: 82 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Lead Spacing: 10.00 mm (exact match required)
• Physical Dimensions: 25.40 mm diameter, 22.00 mm height maximum (exact match required)
• Mounting Type: Through Hole, Radial, Can - Snap-In (exact match required)
• Polarization: Polar (exact match required)
• Operating Temperature Range: -25°C ~ 85°C (exact match required)

Allowable Upgrade Parameters:

• Voltage Rating: May be equal to or higher than 400 V
• Lifetime @ 85°C: May be equal to or higher than 2000 Hrs
• ESR: Lower values are acceptable
• Ripple Current: Higher values are acceptable

The ESMM451VSN820MQ20S from Chemi-Con qualifies as a direct substitute because it maintains all critical matching parameters while offering upgraded electrical characteristics in voltage rating (450 V vs. 400 V) and lifetime (3000 Hrs vs. 2000 Hrs).

Parameter Comparison

Engineering Selection Recommendations

Both the B43231B9826M and ESMM451VSN820MQ20S are active production components with full regulatory compliance. The ESMM451VSN820MQ20S offers measurable advantages in voltage margin (450 V vs. 400 V) and operational lifetime (3000 Hrs vs. 2000 Hrs at 85°C), making it suitable for applications where extended service life or higher voltage transient tolerance is beneficial. Both components maintain ROHS compliance and are rated for identical operating temperature ranges. Selection between these parts should be based on supply availability, cost considerations, and whether the upgraded electrical characteristics align with circuit design requirements.

Frequently Asked Questions (FAQ)

Q: Can the ESMM451VSN820MQ20S replace the B43231B9826M in existing designs?

A: Yes. The ESMM451VSN820MQ20S is a direct mechanical and electrical substitute. It maintains identical capacitance (82 µF), tolerance (±20%), lead spacing (10.00 mm), physical dimensions (25.40 mm diameter, 22.00 mm height), and mounting configuration (through-hole, radial, snap-in). The substitute operates within the same temperature range (-25°C ~ 85°C) and offers upgraded voltage rating and lifetime specifications.

Q: What are the key differences between these two parts?

A: The primary differences are voltage rating (450 V vs. 400 V), lifetime at 85°C (3000 Hrs vs. 2000 Hrs), and ESR specification (4.043 Ohm @ 120 Hz provided for the substitute). These represent upgrades rather than deviations, making the ESMM451VSN820MQ20S suitable for applications requiring higher voltage margin or extended operational life.

Q: Are there any compatibility concerns with PCB layout or mounting?

A: No. Both components share identical lead spacing (10.00 mm), diameter (25.40 mm), and height (22.00 mm). They use the same through-hole, snap-in mounting configuration and require no PCB layout modifications.

Q: Do both parts meet regulatory requirements?

A: Yes. The B43231B9826M is ROHS3 compliant, and the ESMM451VSN820MQ20S is RoHS compliant. Both are REACH unaffected and classified under ECCN EAR99.

Q: Which part should be selected for new designs?

A: Selection depends on supply availability and design requirements. The ESMM451VSN820MQ20S provides higher voltage rating and longer lifetime, which may offer additional design margin. The B43231B9826M remains a valid choice if supply is preferred or cost is a primary consideration.