ALF20C471DF450 Equivalent & Substitute Parts

Part Overview

The ALF20C471DF450 is a 470 µF, 450 V aluminum electrolytic capacitor manufactured by KEMET in the ALF20 series. This radial, can-style, press-fit component is designed for general-purpose applications requiring high voltage energy storage and filtering. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when inventory constraints, lead time requirements, or application-specific performance parameters necessitate alternative component selection while maintaining electrical and mechanical compatibility.

Substiute Parts

ALF20C471DF450

KEMETIn Stock: 853ALF20C471DF450 Datasheet

Current PartRFQ

ALF70C471DF450

KEMETIn Stock: 1822ALF70C471DF450 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ALF20C471DF450 is permissible with the ALF70C471DF450 based on the following criteria:

Matching Parameters (Substitution Basis):

• Capacitance: 470 µF (identical)
• Voltage - Rated: 450 V (identical)
• Tolerance: ±20% (identical)
• Operating Temperature Range: -40°C ~ 85°C (identical)
• Lifetime @ Temperature: 15000 Hrs @ 85°C (identical)
• Mounting Type: Through Hole, Press-Fit (identical)
• Package / Case: Radial, Can - Press-Fit - 4 Lead (identical)
• Lead Spacing: 22.50 mm (identical)
• Size / Dimension: 35.00 mm Dia (identical)
• Height - Seated (Max): 52.00 mm (identical)
• Polarization: Polar (identical)
• RoHS Status: ROHS3 Compliant (identical)

Varying Parameters (Performance Differences):

• ESR (Equivalent Series Resistance): 252 mOhm vs. 299 mOhm @ 100 Hz
• Ripple Current @ Low Frequency: 2.43 A vs. 2.54 A @ 100 Hz
• Ripple Current @ High Frequency: 4.03 A vs. 6.07 A @ 10 kHz
• Impedance: 155 mOhms vs. 167 mOhms

The ALF70C471DF450 represents a variant within the same electrical and mechanical envelope, differing only in internal construction characteristics that affect ESR and ripple current handling.

Parameter Comparison

Engineering Selection Recommendations

Both ALF20C471DF450 and ALF70C471DF450 maintain Active product status with identical RoHS3 compliance and REACH unaffected designation. Selection between these parts is determined by application-specific requirements for ESR and ripple current performance:

ALF20C471DF450 Selection Criteria:

• Applications requiring lower ESR (252 mOhm @ 100 Hz)
• Circuits with lower high-frequency ripple current demands (4.03 A @ 10 kHz)
• Lower impedance requirement (155 mOhms)

ALF70C471DF450 Selection Criteria:

• Applications requiring higher ripple current handling at high frequency (6.07 A @ 10 kHz)
• Circuits tolerant of slightly elevated ESR (299 mOhm @ 100 Hz)
• Higher impedance tolerance (167 mOhms)

Both parts share identical electrical ratings (470 µF, 450 V, ±20%), mechanical dimensions (35.00 mm Dia, 52.00 mm height, 22.50 mm lead spacing), mounting configuration (Through Hole, Press-Fit), and thermal characteristics (15000 Hrs @ 85°C). Substitution is mechanically and electrically valid for applications where the performance parameter variations are acceptable.

Frequently Asked Questions (FAQ)

Q: Can ALF70C471DF450 directly replace ALF20C471DF450 in existing designs?

A: Direct mechanical and electrical substitution is valid. Both parts share identical capacitance (470 µF), voltage rating (450 V), tolerance (±20%), operating temperature range (-40°C ~ 85°C), lifetime rating (15000 Hrs @ 85°C), and physical dimensions (35.00 mm Dia, 52.00 mm height, 22.50 mm lead spacing). The ALF70C471DF450 exhibits higher ESR (299 mOhm vs. 252 mOhm @ 100 Hz) and higher ripple current capability at 10 kHz (6.07 A vs. 4.03 A). Substitution is valid when the application tolerates these performance variations.

Q: What are the key differences between ALF20C471DF450 and ALF70C471DF450?

A: The primary differences are internal construction characteristics affecting ESR and ripple current performance. ALF20C471DF450 provides lower ESR (252 mOhm) and lower high-frequency ripple current (4.03 A @ 10 kHz). ALF70C471DF450 provides higher ESR (299 mOhm) but superior high-frequency ripple current handling (6.07 A @ 10 kHz). All other electrical and mechanical parameters are identical.

Q: Are both parts RoHS3 compliant?

A: Yes. Both ALF20C471DF450 and ALF70C471DF450 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the lead spacing for these components?

A: Both parts feature 22.50 mm lead spacing with identical through-hole, press-fit mounting configuration. PCB footprints are interchangeable.

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

A: ALF70C471DF450 is specified for higher ripple current handling, particularly at high frequency (6.07 A @ 10 kHz vs. 4.03 A @ 10 kHz for ALF20C471DF450). Selection depends on circuit ripple current requirements at the operating frequency.

Q: Are these parts suitable for general-purpose applications?

A: Yes. Both ALF20C471DF450 and ALF70C471DF450 are designated for General Purpose applications with 450 V rated voltage and 470 µF capacitance, suitable for energy storage and filtering in industrial and commercial equipment.