ALS71U274NF040 Equivalent & Substitute Parts

Part Overview

The ALS71U274NF040 is a 270000 µF, 40 V aluminum electrolytic capacitor manufactured by KEMET in the ALS71 series. This radial, can-style capacitor with screw terminals is designed for general-purpose applications requiring high capacitance values in chassis-mount configurations. The part is currently active in production with 863 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part number becomes unavailable or when inventory constraints require component alternatives that maintain identical electrical and mechanical specifications.

Substiute Parts

ALS71U274NF040

KEMETIn Stock: 922ALS71U274NF040 Datasheet

Current PartRFQ

ALS70A274NF040

KEMETIn Stock: 866ALS70A274NF040 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ALS71U274NF040 are identified based on strict parametric equivalence. The substitution criteria are limited to the following electrical and mechanical parameters that must remain identical:

Electrical Parameters (Must Match Exactly):

• Capacitance: 270000 µF
• Voltage Rating: 40 V
• Tolerance: ±20%
• ESR @ 100Hz: 9 mOhm
• Lifetime @ 85°C: 20000 Hrs
• Operating Temperature Range: -40°C ~ 85°C
• Ripple Current @ 100 Hz: 27.8 A
• Ripple Current @ 10 kHz: 28.8 A
• Impedance: 10 mOhms

Mechanical Parameters (Must Match Exactly):

• Lead Spacing: 1.252" (31.80 mm)
• Diameter: 3.031" (77.00 mm)
• Height - Seated (Max): 4.213" (107.00 mm)
• Mounting Type: Chassis Mount
• Package / Case: Radial, Can - Screw Terminals

Compliance Parameters (Must Match Exactly):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The ALS70A274NF040 meets all substitution criteria and is classified as a parametric equivalent. The primary difference between the main part and substitute is the series designation (ALS71 versus ALS70), which reflects internal design evolution within KEMET's product line while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the ALS71U274NF040 and ALS70A274NF040 are active products manufactured by KEMET with full ROHS3 compliance and identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

Inventory Availability: The ALS71U274NF040 has 863 units in stock, while the ALS70A274NF040 has 795 units in stock. Either part is suitable for immediate procurement.

Product Status: Both parts maintain active production status, ensuring long-term availability and supply chain stability.

Compliance Certification: Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Series Designation: The ALS71 series (main part) and ALS70 series (substitute part) represent different design generations within KEMET's aluminum electrolytic capacitor portfolio. The ALS70 series represents an earlier design iteration, while the ALS71 series represents a more recent design. Both series maintain identical performance characteristics for this specific capacitance and voltage rating.

Application Compatibility: No application-specific restrictions exist between these parts. Both are rated for general-purpose applications and are suitable for direct substitution in existing designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the ALS70A274NF040 be used as a direct replacement for the ALS71U274NF040?

A: Yes. The ALS70A274NF040 is a parametric equivalent with identical electrical and mechanical specifications. All critical parameters including capacitance, voltage rating, ESR, ripple current ratings, physical dimensions, and lead spacing are identical. Direct substitution is supported without circuit modification.

Q: What is the difference between the ALS71 and ALS70 series?

A: The ALS71 and ALS70 series represent different design generations within KEMET's aluminum electrolytic capacitor product line. For the 270000 µF, 40 V rating, both series deliver identical electrical performance and physical characteristics. The series designation reflects internal design evolution rather than functional differences.

Q: Are the screw terminal connections identical between these parts?

A: Yes. Both the ALS71U274NF040 and ALS70A274NF040 use radial, can-style screw terminals with identical lead spacing of 1.252" (31.80 mm). Terminal compatibility is complete.

Q: Do these capacitors have the same physical footprint?

A: Yes. Both parts have identical dimensions: 3.031" diameter (77.00 mm) and 4.213" maximum seated height (107.00 mm). Chassis-mount installation is identical for both parts.

Q: What is the ESR specification, and is it the same for both parts?

A: ESR (Equivalent Series Resistance) is specified as 9 mOhm @ 100Hz for both parts. This parameter is critical for ripple current handling and thermal performance. Identical ESR values ensure equivalent performance in power supply and energy storage applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the ALS71U274NF040 and ALS70A274NF040 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing.

Q: What is the ripple current rating for these capacitors?

A: Both parts are rated for 27.8 A ripple current @ 100 Hz and 28.8 A ripple current @ 10 kHz. These ratings define the maximum AC current the capacitor can handle without exceeding temperature limits.

Q: What is the operating temperature range?

A: Both parts operate across -40°C to 85°C. The lifetime specification of 20000 hours applies at the maximum operating temperature of 85°C.

Q: Can these capacitors be used in series or parallel configurations?

A: The provided specifications do not include guidance on series or parallel operation. Application-specific circuit design considerations must be evaluated separately.

Q: What is the moisture sensitivity level, and what does it mean?

A: Both parts have Moisture Sensitivity Level (MSL) of 1, which indicates unlimited shelf life without moisture control measures. These capacitors do not require special moisture-barrier packaging or storage conditions.