T494C685M035AT Equivalent & Substitute Parts

Part Overview

The T494C685M035AT is a 6.8 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V operation with ±20% capacitance tolerance. This component is designed for surface mount applications in the 2312 (6032 Metric) package format. The part maintains Active product status and is ROHS3 compliant, making it suitable for current production environments. Identifying equivalent substitute parts becomes necessary when managing inventory constraints, lead time variations, or when alternative suppliers offer improved availability without compromising electrical or mechanical compatibility.

Substiute Parts

T494C685M035AT

KEMETIn Stock: 774T494C685M035AT Datasheet

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T491C685M035AT

KEMETIn Stock: 5267T491C685M035AT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T494C685M035AT are identified based on strict electrical and mechanical parameter matching. The substitution logic requires:

Mandatory Matching Parameters:

• Capacitance value: 6.8 µF (exact match)
• Voltage rating: 35 V (exact match)
• Capacitance tolerance: ±20% (exact match)
• Package format: 2312 (6032 Metric) (exact match)
• Mounting technology: Surface Mount (exact match)
• Operating temperature range: -55°C ~ 125°C (exact match)
• Component type: Molded Tantalum (exact match)
• Regulatory compliance: ROHS3 Compliant (exact match)

Variable Parameters Permitted in Substitutes:

• ESR (Equivalent Series Resistance): May differ based on series design
• Manufacturer series designation: May differ (T491 vs T494)
• Inventory availability: Independent variable

The T491C685M035AT qualifies as a direct substitute because it maintains identical values across all mandatory parameters while offering a different ESR characteristic through its T491 series design.

Parameter Comparison

Engineering Selection Recommendations

T494C685M035AT Selection Criteria:

• Primary choice when ESR specification of 900 mOhm is a circuit requirement
• Applications requiring lower equivalent series resistance for high-frequency filtering
• Designs where ESR-dependent performance characteristics are critical

T491C685M035AT Selection Criteria:

• Direct functional substitute when ESR is not a limiting circuit parameter
• Applications where higher ESR (1.8 Ohm) is acceptable within circuit tolerance
• Situations requiring improved inventory availability (5196 Pcs vs 731 Pcs in stock)
• Both parts maintain identical compliance status (ROHS3, REACH Unaffected) and regulatory certifications

Interchangeability Statement: Both parts are electrically and mechanically interchangeable at the PCB level for applications where ESR tolerance permits the 1.8 Ohm specification of the T491 series. Circuit validation is required only if ESR is a specified design parameter.

Frequently Asked Questions (FAQ)

Q: Can T491C685M035AT replace T494C685M035AT in any application?

A: Both parts share identical capacitance (6.8 µF), voltage rating (35 V), tolerance (±20%), package (2312/6032 Metric), and operating temperature range (-55°C ~ 125°C). The primary difference is ESR: T494 = 900 mOhm, T491 = 1.8 Ohm. Substitution is valid when circuit design does not specify ESR as a critical parameter. If ESR is a design constraint, circuit validation is required.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both T494C685M035AT and T491C685M035AT use the 2312 (6032 Metric) package with identical dimensions: 0.236" L x 0.126" W (6.00mm x 3.20mm) and maximum seated height of 0.110" (2.80mm). PCB footprints are identical.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and maintain Active product status. Moisture sensitivity level is 1 (Unlimited) for both, indicating no special handling requirements during storage or assembly.

Q: What is the significance of the different ESR values?

A: ESR (Equivalent Series Resistance) affects high-frequency performance and ripple current handling. The T494 series (900 mOhm) has lower ESR, suitable for applications requiring superior high-frequency filtering. The T491 series (1.8 Ohm) has higher ESR but remains within the molded tantalum capacitor performance envelope. Selection depends on circuit requirements.

Q: Are both parts available in the same packaging format?

A: Yes. Both T494C685M035AT and T491C685M035AT are supplied in Tape & Reel (TR) packaging, suitable for automated surface mount assembly processes.

Q: What is the lifetime specification for these capacitors?

A: Both parts specify 2000 hours lifetime at 125°C maximum operating temperature, indicating equivalent reliability characteristics under thermal stress conditions.