ALA7DF821DF400 Equivalent & Substitute Parts

Part Overview

The ALA7DF821DF400 is a 820 µF, 400 V aluminum electrolytic capacitor manufactured by KEMET in the ALA7D series. This radial, can-style snap-in capacitor is designed for through-hole mounting applications and is rated for automotive use under AEC-Q200 standards. The component is currently in active production status with 763 units in stock.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity. Alternative components must maintain identical or superior electrical performance characteristics and physical compatibility within the specified application parameters.

Substiute Parts

ALA7DF821DF400

KEMETIn Stock: 790ALA7DF821DF400 Datasheet

Current PartRFQ

ALA7DA821DF400

KEMETIn Stock: 1309ALA7DA821DF400 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALA7DF821DF400 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Capacitance value: 820 µF (exact match)
• Voltage rating: 400 V (exact match)
• Tolerance: ±20% (exact match)
• Operating temperature range: -40°C to 85°C (exact match)
• Lifetime specification: 15000 Hrs @ 85°C (exact match)
• Polarization: Polar (exact match)

Mechanical Compatibility Requirements:

• Mounting type: Through Hole (exact match)
• Package style: Radial, Can - Snap-In (exact match)
• Physical dimensions: 1.378" Dia (35.00 mm) × 2.047" Height (52.00 mm) (exact match)

Compliance & Certification Requirements:

• AEC-Q200 automotive rating (exact match)
• RoHS3 compliance (exact match)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match)

Substitute parts must satisfy all electrical, mechanical, and compliance criteria simultaneously. Deviations in any parameter disqualify a component from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The ALA7DA821DF400 is a direct parametric equivalent to the ALA7DF821DF400. Both components are manufactured by KEMET within the ALA7D series and satisfy identical electrical, mechanical, and compliance specifications.

Selection Basis:

Both parts maintain active product status and full AEC-Q200 automotive certification. Both are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1), suitable for automotive and industrial applications requiring high reliability.

The ALA7DA821DF400 demonstrates superior performance in ripple current handling (3.2 A @ 100 Hz versus 2.68 A, and 6.45 A @ 10 kHz versus 6.06 A) and lower impedance (136 mOhms versus 357.6 mOhms). These characteristics indicate improved thermal stability and reduced voltage drop under load conditions.

Inventory availability is higher for the ALA7DA821DF400 (1276 units versus 763 units), supporting supply chain continuity and procurement flexibility.

Selection between these components should be based on application-specific ripple current requirements, thermal management constraints, and inventory availability. Both components are electrically and mechanically interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the ALA7DA821DF400 be used as a direct replacement for the ALA7DF821DF400?

A: Yes. Both components are parametric equivalents with identical capacitance (820 µF), voltage rating (400 V), tolerance (±20%), operating temperature range (-40°C to 85°C), lifetime specification (15000 Hrs @ 85°C), and physical dimensions (1.378" Dia × 2.047" Height). Both are AEC-Q200 rated and RoHS3 compliant. Mechanical compatibility is confirmed through identical through-hole mounting and radial snap-in package configuration.

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

A: The primary differences are performance enhancements in the ALA7DA821DF400: ripple current capacity is higher (3.2 A @ 100 Hz and 6.45 A @ 10 kHz versus 2.68 A and 6.06 A respectively), and impedance is lower (136 mOhms versus 357.6 mOhms). These differences indicate improved thermal performance and reduced voltage drop under load. Inventory availability is also higher for the substitute part.

Q: Are there any physical dimension differences that would affect PCB layout or mounting?

A: No. Both components have identical physical dimensions: 1.378" diameter (35.00 mm) and maximum seated height of 2.047" (52.00 mm). Both use through-hole radial snap-in mounting. PCB footprints and mounting hole spacing are identical.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both the ALA7DF821DF400 and ALA7DA821DF400 carry AEC-Q200 automotive qualification ratings. Both are RoHS3 compliant and have unlimited moisture sensitivity (MSL 1), meeting automotive reliability and environmental requirements.

Q: Which part should be selected for high ripple current applications?

A: The ALA7DA821DF400 is suitable for applications requiring higher ripple current handling. It supports 3.2 A @ 100 Hz and 6.45 A @ 10 kHz, compared to 2.68 A and 6.06 A for the ALA7DF821DF400. The lower impedance (136 mOhms) also provides better performance under transient load conditions.

Q: Are there any compatibility issues with existing circuit designs?

A: No compatibility issues exist. Both components are pin-compatible through-hole devices with identical electrical specifications. Existing circuit designs require no modification for component substitution.

Q: What is the difference in ESR between these parts?

A: Both components have identical ESR specifications of 219.6 mOhm @ 100 Hz. ESR equivalence ensures consistent voltage regulation and thermal performance in the application circuit.

Q: Can inventory availability influence the selection decision?

A: Yes. The ALA7DA821DF400 has higher inventory availability (1276 units versus 763 units). For applications with extended lead times or high-volume procurement requirements, the substitute part may offer supply chain advantages while maintaining full electrical and mechanical compatibility.