ALC70D681DF400 Equivalent & Substitute Parts

Part Overview

The ALC70D681DF400 is a 680 µF, 400 V aluminum electrolytic capacitor manufactured by KEMET in the ALC70 series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is currently Active in product status with 800 pieces in stock. Equivalent substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative sourcing is required.

Substiute Parts

ALC70D681DF400

KEMETIn Stock: 878ALC70D681DF400 Datasheet

Current PartRFQ

ALC70A681DF400

KEMETIn Stock: 1800ALC70A681DF400 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALC70D681DF400 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Capacitance: 680 µF
• Tolerance: ±20%
• Voltage Rating: 400 V
• Operating Temperature Range: -40°C to 85°C
• Lifetime: 15000 Hours @ 85°C
• Ripple Current Ratings: 2.99 A @ 100 Hz and 6.92 A @ 10 kHz

Mechanical Parameters (Must Match):

• Lead Spacing: 10.00 mm
• Diameter: 35.00 mm
• Height: 52.00 mm (seated maximum)
• Package Type: Radial, Can - Snap-In
• Mounting Type: Through Hole

Compliance Parameters (Must Match):

• RoHS3 Compliant
• REACH Unaffected
• ECCN: EAR99

The ALC70A681DF400 meets all substitution criteria. Both parts belong to the KEMET ALC70 series and share identical electrical performance specifications, mechanical dimensions, and regulatory compliance status. The ESR variance (204.7 mOhm versus 205 mOhm) falls within acceptable engineering tolerance for this component category.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The ALC70D681DF400 is the specified component and should be used when available. Both the main part and substitute maintain Active product status with KEMET, ensuring long-term availability and consistent manufacturing quality.

Substitute Part Selection: The ALC70A681DF400 is a direct parametric equivalent and may be selected when the primary part number is unavailable. Both parts carry identical electrical ratings, mechanical dimensions, and regulatory compliance certifications (ROHS3 Compliant, REACH Unaffected, EAR99). The negligible ESR difference (204.7 mOhm versus 205 mOhm) does not affect circuit performance within the specified operating parameters.

Compliance Assurance: Both parts satisfy ROHS3 and REACH regulatory requirements. No additional compliance verification is required when substituting between these part numbers within the same application context.

Inventory Considerations: The ALC70A681DF400 currently has higher inventory availability (1770 pieces) compared to the ALC70D681DF400 (800 pieces), supporting supply chain flexibility for high-volume procurement scenarios.

Frequently Asked Questions (FAQ)

Q: Can the ALC70A681DF400 be used as a direct replacement for the ALC70D681DF400?

A: Yes. Both parts are parametrically equivalent across all critical electrical, mechanical, and compliance specifications. They share identical capacitance (680 µF), voltage rating (400 V), temperature range (-40°C to 85°C), ripple current ratings, physical dimensions, and mounting configuration. Direct substitution is supported without circuit redesign.

Q: What is the difference between the ALC70D and ALC70A designations?

A: The ALC70D and ALC70A are both part of the KEMET ALC70 series. The letter designation indicates internal design variants within the same series. Both variants meet identical performance specifications for the 680 µF, 400 V configuration, making them functionally interchangeable for this capacitance and voltage rating.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts have identical lead spacing (10.00 mm), diameter (35.00 mm), and seated height (52.00 mm). They use the same radial, can-style snap-in package and through-hole mounting configuration. PCB layout and mechanical assembly requirements are identical.

Q: Does the ESR difference affect circuit performance?

A: No. The ESR values (205 mOhm for ALC70D681DF400 and 204.7 mOhm for ALC70A681DF400) are equivalent within engineering tolerance. This 0.3 mOhm variance is negligible and does not impact filtering performance, ripple current handling, or thermal characteristics in typical applications.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the ALC70D681DF400 and ALC70A681DF400 are ROHS3 Compliant and REACH Unaffected. They carry identical regulatory classification (ECCN: EAR99) and meet all applicable environmental and trade compliance requirements.

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

A: Yes. No design changes are required. Both parts are pin-compatible, dimensionally identical, and electrically equivalent. Existing PCB layouts, schematics, and assembly procedures require no modification when substituting between these part numbers.

Q: What is the lead spacing specification?

A: Both parts have a lead spacing of 10.00 mm (0.394 inches), measured center-to-center. This dimension is critical for PCB footprint compatibility and through-hole mounting alignment.

Q: Are there any temperature or operating condition differences?

A: No. Both parts operate across the identical temperature range (-40°C to 85°C) and maintain the same lifetime rating of 15000 hours at 85°C. Ripple current specifications at both 100 Hz and 10 kHz are identical.