T491X687M004AT Equivalent & Substitute Parts

Part Overview

The T491X687M004AT is a 680 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 in compact form factors. The part is packaged in Tape & Reel (TR) format for automated assembly processes.

Equivalent and substitute parts are identified when alternative manufacturers offer components with matching or superior electrical and mechanical specifications within the same package envelope and functional category. Substitution becomes necessary due to inventory availability, supply chain considerations, or specific compliance requirements.

Substiute Parts

T491X687M004AT

KEMETIn Stock: 661T491X687M004AT Datasheet

Current PartRFQ

TPMD687M004H0025

KYOCERA AVXIn Stock: 1484TPMD687M004H0025 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491X687M004AT are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or exceed the main part specifications:

Critical Matching Parameters:

• Capacitance: 680 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 4 V (minimum requirement)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
• Type: Molded Tantalum (exact match required)

Performance Parameters:

• ESR (Equivalent Series Resistance): Lower values indicate superior performance
• Lifetime @ Temp.: 2000 Hrs @ 125°C (minimum requirement)

The TPMD687M004H0025 from KYOCERA AVX meets all critical matching parameters and demonstrates superior ESR performance (25 mOhm @ 100kHz versus 500 mOhm for the main part), making it a direct electrical equivalent with enhanced characteristics.

Parameter Comparison

Engineering Selection Recommendations

T491X687M004AT (KEMET):

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected
• ECCN: EAR99

This part is suitable for applications requiring full RoHS3 compliance and unrestricted moisture sensitivity handling. The ROHS3 compliance and MSL 1 rating provide maximum flexibility for storage and assembly processes without moisture bake-out requirements.

TPMD687M004H0025 (KYOCERA AVX):

• Product Status: Active
• RoHS Status: RoHS non-compliant
• Moisture Sensitivity Level (MSL): 3 (168 Hours)
• ECCN: EAR99

This part offers superior ESR performance (25 mOhm @ 100kHz) and lower seated height (3.10mm versus 4.30mm), providing advantages in applications where thermal performance or space constraints are critical. However, RoHS non-compliance and MSL 3 rating require consideration in regulated environments and assembly planning.

Selection between these parts depends on compliance requirements and thermal performance priorities. Both parts share identical electrical ratings and package dimensions, ensuring mechanical and electrical interchangeability within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can TPMD687M004H0025 directly replace T491X687M004AT in all applications?

A: Both parts share identical capacitance (680 µF), voltage rating (4 V), tolerance (±20%), package (2917/7343 Metric), and operating temperature range (-55°C ~ 125°C). Mechanical interchangeability is confirmed. However, RoHS compliance status differs: T491X687M004AT is ROHS3 compliant while TPMD687M004H0025 is RoHS non-compliant. Verify compliance requirements for your application before substitution.

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

A: The TPMD687M004H0025 has significantly lower ESR (25 mOhm @ 100kHz) compared to the T491X687M004AT (500 mOhm). Lower ESR reduces heat generation and improves transient response characteristics. This difference is relevant for applications with high ripple current or stringent thermal requirements.

Q: Are there package dimension differences that affect PCB layout?

A: Both parts use the 2917 (7343 Metric) package with identical length (0.287" / 7.30mm) and width (0.169" / 4.30mm). The seated height differs: T491X687M004AT is 0.169" (4.30mm) while TPMD687M004H0025 is 0.122" (3.10mm). The lower profile of TPMD687M004H0025 may provide advantages in space-constrained designs.

Q: What are the moisture sensitivity implications?

A: T491X687M004AT has MSL 1 (Unlimited), requiring no moisture bake-out before soldering. TPMD687M004H0025 has MSL 3 (168 Hours), requiring moisture bake-out if the part has been exposed to ambient conditions for extended periods. Assembly process planning must account for this difference.

Q: Are both parts available in Tape & Reel packaging?

A: Yes, both T491X687M004AT and TPMD687M004H0025 are supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly processes.

Q: What is the lifetime rating for both parts?

A: Both parts are rated for 2000 hours at 125°C, providing equivalent reliability under thermal stress conditions within the specified operating temperature range.