ALA7DF391CF500 Equivalent & Substitute Parts

Part Overview

The ALA7DF391CF500 is a 390 µF, 500 V aluminum electrolytic capacitor manufactured by KEMET in the ALA7D series. This component is a radial, can-style snap-in capacitor designed for through-hole mounting in automotive applications. The part maintains an active product status and carries AEC-Q200 automotive qualification. Equivalent substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Substiute Parts

ALA7DF391CF500

KEMETIn Stock: 779ALA7DF391CF500 Datasheet

Current PartRFQ

ALA7DA391CF500

KEMETIn Stock: 1100ALA7DA391CF500 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALA7DF391CF500 is limited to parts meeting the following criteria:

Critical Electrical Parameters (Must Match Exactly):

• Capacitance: 390 µF
• Voltage Rating: 500 V
• Tolerance: ±20%
• ESR @ 100 Hz: 636 mOhm
• Lifetime @ 85°C: 13000 Hours
• Operating Temperature Range: -40°C to +85°C

Critical Mechanical Parameters (Must Match Exactly):

• Package Type: Radial, Can - Snap-In
• Mounting Type: Through Hole
• Physical Diameter: 1.181" (30.00 mm)
• Physical Height: 2.047" (52.00 mm)
• Polarization: Polar

Compliance & Certification (Must Match):

• AEC-Q200 Automotive Rating
• ROHS3 Compliance
• Moisture Sensitivity Level: 1 (Unlimited)

The ALA7DA391CF500 qualifies as a parametric equivalent substitute because it maintains identical values across all critical electrical and mechanical parameters, as well as automotive and environmental compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the ALA7DF391CF500 and ALA7DA391CF500 are active products manufactured by KEMET within the ALA7D series. Selection between these parts is based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical capacitance (390 µF), voltage rating (500 V), tolerance (±20%), and ESR specifications (636 mOhm @ 100 Hz). The ripple current ratings and impedance values differ slightly but remain within acceptable engineering tolerances for the specified application category.

Mechanical Compatibility: Both parts feature identical physical dimensions (1.181" diameter, 2.047" height), radial snap-in package configuration, and through-hole mounting interface. Direct board-level substitution is supported without PCB redesign or mechanical rework.

Compliance & Certification: Both parts carry AEC-Q200 automotive qualification, ROHS3 compliance, and MSL Level 1 rating. No compliance gaps exist between the two parts for automotive applications.

Inventory & Availability: The ALA7DA391CF500 maintains higher inventory availability (1042 pcs) compared to the ALA7DF391CF500 (751 pcs), supporting supply chain continuity and procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the ALA7DA391CF500 be used as a direct replacement for the ALA7DF391CF500 in automotive applications?

A: Yes. Both parts are KEMET ALA7D series aluminum electrolytic capacitors with identical electrical specifications (390 µF, 500 V, ±20% tolerance, 636 mOhm ESR), mechanical dimensions, and AEC-Q200 automotive qualification. Direct substitution is supported without circuit redesign.

Q: Are there differences in ripple current handling between these two parts?

A: Minor differences exist in ripple current ratings. The ALA7DF391CF500 specifies 2.42 A @ 100 Hz and 6.52 A @ 10 kHz, while the ALA7DA391CF500 specifies 2.4 A @ 100 Hz and 5.24 A @ 10 kHz. Both values remain within acceptable operating parameters for the 390 µF, 500 V capacitor category and do not affect substitution eligibility.

Q: Do both parts have identical physical dimensions for PCB mounting?

A: Yes. Both parts share identical dimensions: 1.181" (30.00 mm) diameter and 2.047" (52.00 mm) height. The radial snap-in package configuration and through-hole mounting interface are identical, enabling direct board-level substitution without mechanical modification.

Q: What is the operating temperature range for both parts?

A: Both the ALA7DF391CF500 and ALA7DA391CF500 operate across the temperature range of -40°C to +85°C with a rated lifetime of 13000 hours at 85°C. Operating temperature specifications are identical between the two parts.

Q: Are both parts RoHS compliant?

A: Yes. Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Environmental and regulatory compliance is identical between the two parts.

Q: What is the difference between the ALA7DF and ALA7DA base product numbers?

A: The ALA7DF391CF500 and ALA7DA391CF500 represent different internal KEMET product designations within the ALA7D series. Both maintain identical electrical and mechanical specifications for the 390 µF, 500 V capacitor configuration. The base product number difference does not affect functional equivalence or substitution eligibility.