ALA7DF391DC450 Equivalent & Substitute Parts

Part Overview

The ALA7DF391DC450 is a 390 µF, 450 V aluminum electrolytic capacitor manufactured by KEMET in the ALA7D series. This radial, can-style snap-in capacitor is designed for through-hole mounting and is rated for automotive applications under AEC-Q200 standards. The part is currently active in production with 917 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 stock sources are required.

Substiute Parts

ALA7DF391DC450

KEMETIn Stock: 1005ALA7DF391DC450 Datasheet

Current PartRFQ

ALA7DA391DC450

KEMETIn Stock: 2874ALA7DA391DC450 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALA7DF391DC450 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Capacitance: 390 µF
• Voltage Rating: 450 V
• Tolerance: ±20%
• ESR @ 100 Hz: 394 mOhm
• Lifetime @ Temperature: 15000 Hrs @ 85°C
• Operating Temperature Range: -40°C ~ 85°C

Mechanical Parameters (Must Match):

• Package Type: Radial, Can - Snap-In
• Mounting Type: Through Hole
• Size (Diameter): 1.378" (35.00 mm)
• Height (Seated Max): 1.457" (37.00 mm)
• Polarization: Polar

Compliance Parameters (Must Match):

• AEC-Q200 Rating
• RoHS3 Compliance
• Automotive Application Suitability

The substitute part ALA7DA391DC450 meets all critical electrical, mechanical, and compliance requirements for direct substitution. Both parts belong to the ALA7D series and share identical capacitance, voltage, tolerance, ESR, lifetime, temperature range, package configuration, and dimensional specifications.

Parameter Comparison

Engineering Selection Recommendations

The ALA7DA391DC450 is a direct parametric equivalent to the ALA7DF391DC450 for all critical electrical, mechanical, and compliance specifications. Both parts are manufactured by KEMET, carry AEC-Q200 automotive qualification, and comply with ROHS3 requirements. The parts are identical in capacitance (390 µF), voltage rating (450 V), tolerance (±20%), ESR (394 mOhm @ 100 Hz), lifetime (15000 Hrs @ 85°C), operating temperature range (-40°C ~ 85°C), package configuration (Radial, Can - Snap-In), and physical dimensions (1.378" diameter × 1.457" height).

Selection between these two part numbers should be based on availability and procurement requirements. The ALA7DA391DC450 offers higher ripple current capability and lower impedance, which may provide performance advantages in applications with elevated AC stress. The ALA7DA391DC450 also maintains significantly higher inventory levels (2784 pieces versus 917 pieces), supporting faster procurement cycles and supply chain resilience.

Both parts are suitable for direct substitution in automotive applications requiring 390 µF, 450 V aluminum electrolytic capacitors with snap-in through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can ALA7DA391DC450 be used as a direct replacement for ALA7DF391DC450?

A: Yes. Both parts are parametrically equivalent across all critical electrical specifications (capacitance, voltage, tolerance, ESR, lifetime, temperature range), mechanical configuration (package type, mounting style, dimensions), and compliance ratings (AEC-Q200, ROHS3). Direct substitution is supported without circuit redesign.

Q: What are the differences between these two part numbers?

A: The primary differences are in ripple current performance and impedance. The ALA7DA391DC450 provides higher ripple current ratings (2.7 A @ 100 Hz and 5.84 A @ 10 kHz versus 1.54 A and 3.69 A respectively) and lower impedance (163 mOhms versus 759.6 mOhms). These differences represent performance enhancements in the substitute part. Inventory availability also differs, with ALA7DA391DC450 maintaining higher stock levels.

Q: Are the physical dimensions identical?

A: Yes. Both parts share identical dimensions: 1.378 inches (35.00 mm) diameter and 1.457 inches (37.00 mm) seated height. They use the same radial, can-style snap-in package for through-hole mounting. PCB layout and mechanical fit are identical.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both ALA7DF391DC450 and ALA7DA391DC450 carry AEC-Q200 automotive qualification and are suitable for automotive applications. Both comply with ROHS3 environmental standards.

Q: Which part should be selected for new designs?

A: For new designs, ALA7DA391DC450 is the recommended selection. It provides superior ripple current performance and lower impedance while maintaining full parametric equivalence to ALA7DF391DC450. The higher inventory availability also supports manufacturing continuity.

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

A: Yes. The parts are mechanically and electrically interchangeable. No circuit modifications, PCB layout changes, or assembly procedure adjustments are required. The substitute part can be installed using identical assembly processes.

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

A: Both parts operate across -40°C to 85°C. Lifetime rating is specified as 15000 hours at 85°C for both parts.

Q: Are there any lead spacing or mounting considerations?

A: Both parts use through-hole radial, can-style snap-in mounting with identical physical dimensions. No special mounting considerations apply to either part. Standard through-hole assembly processes are appropriate for both.