T520D477M004ASE040 Equivalent & Substitute Parts

Part Overview

The T520D477M004ASE040 is a 470 µF molded tantalum polymer capacitor rated for 4 V operation in a 2917 (7343 Metric) surface mount package. This component is manufactured by KEMET under the KO-CAP® T520 series and is classified as obsolete. The part features 40 mOhm equivalent series resistance at 100 kHz and operates across a temperature range of -55°C to 105°C with a 2000-hour lifetime rating at 105°C.

Due to the obsolete status of the T520D477M004ASE040, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

T520D477M004ASE040

KEMETIn Stock: 808T520D477M004ASE040 Datasheet

Current PartRFQ

T520D477M004ATE040

KEMETIn Stock: 2336T520D477M004ATE040 Datasheet

DirectRFQ

TCJY477M004R0040

KYOCERA AVXIn Stock: 3543TCJY477M004R0040 Datasheet

DirectRFQ

TCJY477M004R0040E

KYOCERA AVXIn Stock: 2611TCJY477M004R0040E Datasheet

DirectRFQ

T55D477M004C0025

Vishay SpragueIn Stock: 1547T55D477M004C0025 Datasheet

SimilarRFQ

TCJD477M004R0040

KYOCERA AVXIn Stock: 4851TCJD477M004R0040 Datasheet

Parametric EquivalentRFQ

TCJD477M004R0040E

KYOCERA AVXIn Stock: 2703TCJD477M004R0040E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T520D477M004ASE040 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Capacitance: 470 µF (exact match required)
• Voltage Rating: 4 V (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Molded Tantalum Polymer (exact match required)
• Tolerance: ±20% (exact match required)
• Operating Temperature Range: -55°C to 105°C (exact match required)
• ESR @ 100 kHz: 40 mOhm (exact match required for direct equivalents)

Secondary Consideration:

• Physical dimensions and height may vary within the same package designation
• ESR values of 25 mOhm represent improved performance characteristics while maintaining functional compatibility

Substitute parts are classified into two categories: Direct Equivalents (matching all primary criteria including ESR) and Similar Parts (matching all primary criteria with improved ESR performance).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

T520D477M004ATE040 (KEMET) is the direct equivalent of the obsolete T520D477M004ASE040. This part maintains identical electrical specifications, physical dimensions, and height characteristics. The primary distinction is product status: T520D477M004ATE040 is active and ROHS3 compliant, addressing the regulatory compliance gap of the obsolete original part. Packaging format differs (Tape & Reel versus the original specification), but electrical performance is identical.

Parametric Equivalents (Matching ESR and Dimensions):

TCJD477M004R0040 and TCJD477M004R0040E (KYOCERA AVX) provide parametric equivalence with identical ESR (40 mOhm) and maximum height (0.122" / 3.10 mm) matching the original part. Both are active products with ROHS3 compliance. These parts are suitable for applications where height clearance and ESR performance are critical design constraints.

Compact Profile Alternatives (Reduced Height):

TCJY477M004R0040 and TCJY477M004R0040E (KYOCERA AVX) maintain all electrical specifications and ESR performance while offering reduced maximum height (0.079" / 2.00 mm). These parts are active and ROHS3 compliant. Selection of these variants is appropriate for space-constrained applications where the lower profile does not conflict with circuit board layout requirements.

Performance-Enhanced Alternative:

T55D477M004C0025 (Vishay Sprague vPolyTan™ T55 series) provides improved ESR performance at 25 mOhm compared to the 40 mOhm specification of the original part. This part is active and maintains identical capacitance, voltage rating, package, and height dimensions. Selection of this part is appropriate for applications where lower ESR provides performance benefits such as reduced ripple current or improved transient response.

All substitute parts maintain the required operating temperature range (-55°C to 105°C), moisture sensitivity level (MSL 3), and general-purpose application classification.

Frequently Asked Questions (FAQ)

Q: Can T520D477M004ATE040 be used as a direct replacement for T520D477M004ASE040?

A: Yes. T520D477M004ATE040 is the direct equivalent with identical electrical specifications (470 µF, 4 V, 40 mOhm ESR), physical dimensions, and height. The primary difference is that T520D477M004ATE040 is an active product with ROHS3 compliance, whereas the original is obsolete and non-compliant.

Q: What is the difference between TCJY and TCJD variants from KYOCERA AVX?

A: Both TCJY and TCJD variants from KYOCERA AVX maintain identical electrical specifications (470 µF, 4 V, 40 mOhm ESR). The distinction is physical height: TCJY variants have a maximum height of 0.079" (2.00 mm), while TCJD variants have a maximum height of 0.122" (3.10 mm). Selection depends on available board space and height clearance requirements.

Q: Is the Vishay Sprague T55D477M004C0025 compatible with the original part?

A: T55D477M004C0025 is functionally compatible with the original part across all critical parameters: 470 µF capacitance, 4 V voltage rating, 2917 package, and identical physical dimensions. The key difference is improved ESR performance at 25 mOhm compared to the original 40 mOhm specification. This lower ESR represents enhanced performance and is suitable for applications where reduced impedance is beneficial.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except T55D477M004C0025, for which RoHS status is not specified in the provided data. The original T520D477M004ASE040 is RoHS non-compliant. If RoHS compliance is a design requirement, KEMET T520D477M004ATE040 or KYOCERA AVX TCJ series parts (TCJY and TCJD variants) are appropriate selections.

Q: What is the significance of the "E" suffix in part numbers TCJY477M004R0040E and TCJD477M004R0040E?

A: The "E" suffix designation is present in the provided part numbers but no functional or specification difference is documented between parts with and without this suffix. Both variants maintain identical electrical specifications and are active products with ROHS3 compliance.

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

A: Substitution is appropriate when the substitute part meets or exceeds the electrical specifications of the original design. All listed substitute parts maintain the required 470 µF capacitance, 4 V voltage rating, and operating temperature range. Physical height differences (0.079" versus 0.122") must be evaluated against available board clearance. ESR values of 25 mOhm (Vishay part) represent improved performance and are compatible with designs specified for 40 mOhm ESR.

Q: What is the Moisture Sensitivity Level (MSL) and why is it important?

A: All parts listed, including the original and all substitutes, have MSL 3 (168 Hours). This specification indicates the maximum time the component can be exposed to ambient conditions of 30°C and 85% relative humidity before soldering. MSL 3 requires baking of the component prior to reflow soldering if the 168-hour exposure window has been exceeded. This specification is identical across all parts and does not affect substitution decisions.