T491D477M004AT Equivalent & Substitute Parts

Part Overview

The T491D477M004AT is a 470 µF molded tantalum capacitor manufactured by KEMET, rated for 4 V operation in a 2917 (7343 Metric) surface mount package. This component is classified as Active product status and is designed for general purpose applications requiring stable capacitance and low equivalent series resistance in compact form factors.

Substitute parts are identified when equivalent electrical and mechanical specifications are met within the allowed parameter tolerances for molded tantalum capacitors. Substitution becomes necessary due to inventory availability, supply chain considerations, or specific manufacturing requirements while maintaining functional compatibility in the target application.

Substiute Parts

T491D477M004AT

KEMETIn Stock: 1018T491D477M004AT Datasheet

Current PartRFQ

293D477X0004D2TE3

Vishay SpragueIn Stock: 874293D477X0004D2TE3 Datasheet

DirectRFQ

TAJD477M004RNJ

KYOCERA AVXIn Stock: 1129TAJD477M004RNJ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491D477M004AT are qualified based on the following critical parameters that must match or remain within acceptable engineering tolerances:

Mandatory Matching Parameters:

• Capacitance: 470 µF (exact match required)
• Tolerance: ±20% (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 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Variable Parameters (Non-Critical for Substitution):

• Equivalent Series Resistance (ESR): 800 mOhm (main part) vs. 600 mOhm or 900 mOhm (substitutes) — variation acceptable within molded tantalum capacitor specifications
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT) — both acceptable for surface mount assembly
• Height - Seated (Max): 3.10 mm (main part) vs. 2.90 mm (substitute) — both within 2917 package envelope
• Manufacturer: KEMET, Vishay Sprague, or KYOCERA AVX — all qualified manufacturers

All substitute parts maintain active product status and full compliance with RoHS3 and REACH requirements.

Parameter Comparison

Engineering Selection Recommendations

All three parts listed—T491D477M004AT (KEMET), 293D477X0004D2TE3 (Vishay Sprague), and TAJD477M004RNJ (KYOCERA AVX)—are functionally equivalent for applications requiring 470 µF, 4 V molded tantalum capacitors in 2917 package form factors.

Selection Criteria Based on Provided Specifications:

T491D477M004AT (KEMET): Primary reference part with 800 mOhm ESR. Supplied in Tape & Reel packaging. Rated for 2000 hours at 125°C. Suitable for standard surface mount assembly processes.

293D477X0004D2TE3 (Vishay Sprague): Equivalent substitute with lower ESR specification (600 mOhm). Supplied in Cut Tape packaging. Identical electrical and thermal ratings. Selection appropriate when lower ESR performance is beneficial or when Cut Tape format aligns with assembly workflow.

TAJD477M004RNJ (KYOCERA AVX): Equivalent substitute with higher ESR specification (900 mOhm). Supplied in Tape & Reel packaging. Seated height is 0.114" (2.90mm) versus 0.122" (3.10mm) for other variants. Selection appropriate for applications with height constraints or when KYOCERA AVX supply chain is preferred.

All parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating. Product status is Active for all three manufacturers, ensuring continued availability and support.

Frequently Asked Questions (FAQ)

Q: Can the 293D477X0004D2TE3 (Vishay Sprague) directly replace the T491D477M004AT (KEMET)?

A: Yes. Both parts share identical capacitance (470 µF), voltage rating (4 V), tolerance (±20%), package (2917), operating temperature range (-55°C ~ 125°C), and compliance certifications (ROHS3, REACH). The 293D477X0004D2TE3 features lower ESR (600 mOhm vs. 800 mOhm), which is a performance advantage. The primary difference is packaging format: Cut Tape versus Tape & Reel.

Q: What is the significance of ESR differences between these parts?

A: Equivalent Series Resistance (ESR) affects ripple current handling and thermal performance. The 293D477X0004D2TE3 has the lowest ESR at 600 mOhm, the T491D477M004AT is at 800 mOhm, and the TAJD477M004RNJ is at 900 mOhm. Lower ESR generally provides better high-frequency performance and reduced heat generation. All three values are within acceptable ranges for molded tantalum capacitors in this voltage and capacitance class.

Q: Are there physical compatibility concerns when substituting these parts?

A: All three parts conform to the 2917 (7343 Metric) package standard with identical footprint dimensions (0.287" L x 0.169" W). The TAJD477M004RNJ has a slightly lower seated height (0.114" / 2.90mm) compared to the other two (0.122" / 3.10mm). This difference is within package tolerance and does not affect PCB layout compatibility. Verify clearance requirements for your specific application if height is a constraint.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects handling, storage, and assembly logistics only. Tape & Reel (TR) and Cut Tape (CT) formats contain identical components. Selection between formats depends on assembly equipment compatibility and inventory management practices.

Q: Are all three parts suitable for the full operating temperature range?

A: Yes. All three parts are rated for -55°C ~ 125°C operation. The T491D477M004AT specifies 2000 hours lifetime at 125°C. Lifetime specifications for the Vishay Sprague and KYOCERA AVX parts are not provided in the available data but both maintain the same temperature rating and Active product status.

Q: What compliance certifications apply to all substitute parts?

A: All three parts are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. ECCN classification is EAR99 and HTSUS code is 8532.21.0050 for all variants.