T491C685M035AS Equivalent & Substitute Parts

Part Overview

The T491C685M035AS is a 6.8 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V with ±20% tolerance and 1.8Ω equivalent series resistance (ESR). This component is housed in a 2312 (6032 Metric) surface mount package and operates across a temperature range of -55°C to 125°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Capacitance	6.8 µF
Voltage Rating	35 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	1.8Ω
Package / Case	2312 (6032 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Type	Molded Tantalum
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the T491C685M035AS is determined by strict equivalence across the following critical parameters: capacitance value (6.8 µF), voltage rating (35 V), package form factor (2312/6032 Metric), ESR specification (1.8Ω), and mounting type (surface mount). Parts are grouped into three categories based on their relationship to the main part:

Direct Equivalents maintain identical electrical specifications and package dimensions, differing only in packaging format or product status. These parts are interchangeable without circuit modification.

Upgrade Substitutes provide improved tolerance (±10% versus ±20%) or extended operating temperature range while maintaining all other critical parameters. These parts offer enhanced performance characteristics within the same physical footprint.

Similar Alternatives share the same electrical and mechanical specifications but originate from different manufacturers or product series. These parts provide functional equivalence with potential differences in supplier availability and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR	Package	Temp. Range	Product Status	RoHS Status
T491C685M035AS	KEMET	6.8 µF	35 V	±20%	1.8Ω	2312 (6032)	-55°C ~ 125°C	Obsolete	RoHS Non-Compliant
T491C685M035AT	KEMET	6.8 µF	35 V	±20%	1.8Ω	2312 (6032)	-55°C ~ 125°C	Active	RoHS3 Compliant
TH3C685M035E1800	Vishay Sprague	6.8 µF	35 V	±20%	1.8Ω	2312 (6032)	-55°C ~ 150°C	Active	RoHS Non-Compliant
TAJC685K035H	KYOCERA AVX	6.8 µF	35 V	±10%	1.8Ω	2312 (6032)	-55°C ~ 125°C	Active	RoHS Non-Compliant
TH3C685K035E1800	Vishay Sprague	6.8 µF	35 V	±10%	1.8Ω	2312 (6032)	-55°C ~ 150°C	Active	RoHS Non-Compliant
TH3C685M035F1800	Vishay Sprague	6.8 µF	35 V	±20%	1.8Ω	2312 (6032)	-55°C ~ 150°C	Active	RoHS Non-Compliant
293D685X0035C2TE3	Vishay Sprague	6.8 µF	35 V	±20%	1.8Ω	2312 (6032)	-55°C ~ 125°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with RoHS3 Compliance: The T491C685M035AT (KEMET) is the primary direct equivalent, maintaining identical electrical specifications and package dimensions while offering active product status and RoHS3 compliance. This part is recommended for applications requiring regulatory compliance and long-term supply continuity.

For RoHS3 Compliance with Extended Temperature Range: The 293D685X0035C2TE3 (Vishay Sprague) provides RoHS3 compliance and active product status. This part maintains the original operating temperature range of -55°C to 125°C and is suitable for applications with strict environmental compliance requirements.

For Extended Operating Temperature Range: The TH3C685M035E1800 and TH3C685M035F1800 (Vishay Sprague) extend the operating temperature range to -55°C to 150°C while maintaining all other electrical parameters. These parts are applicable to designs requiring operation at elevated temperatures. The TH3C685M035E1800 carries AEC-Q200 automotive qualification.

For Improved Tolerance Specification: The TAJC685K035H (KYOCERA AVX) and TH3C685K035E1800 (Vishay Sprague) provide ±10% tolerance in place of the original ±20%, offering tighter capacitance control. The TH3C685K035E1800 combines improved tolerance with extended temperature range (-55°C to 150°C) and AEC-Q200 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can T491C685M035AT be used as a direct replacement for T491C685M035AS?

A: Yes. The T491C685M035AT is electrically and mechanically identical to the T491C685M035AS, with the primary differences being active product status and RoHS3 compliance. The only distinction is packaging format (Tape & Reel versus bulk).

Q: What is the difference between ±20% and ±10% tolerance specifications?

A: Tolerance defines the allowable deviation of the actual capacitance value from the nominal specification. ±20% tolerance permits a range of 5.44 µF to 8.16 µF, while ±10% tolerance restricts the range to 6.12 µF to 7.48 µF. Applications requiring tighter capacitance control should specify ±10% tolerance parts.

Q: Are Vishay Sprague TH3 series parts compatible with the KEMET T491 series in the same circuit?

A: Yes, provided all electrical parameters match. The TH3C685M035E1800, TH3C685M035F1800, and TH3C685K035E1800 share identical capacitance, voltage rating, ESR, and package dimensions with the T491C685M035AS. Physical footprint and electrical performance are equivalent.

Q: What does AEC-Q200 qualification indicate?

A: AEC-Q200 is an automotive qualification standard. Parts bearing this rating (TH3C685M035E1800 and TH3C685K035E1800) have undergone additional reliability testing and are approved for automotive applications. This certification does not affect compatibility with non-automotive designs.

Q: Does RoHS3 compliance affect electrical performance?

A: No. RoHS3 compliance indicates the absence of restricted substances (lead, cadmium, mercury, etc.) but does not alter electrical characteristics. RoHS3 compliant parts (T491C685M035AT and 293D685X0035C2TE3) perform identically to non-compliant equivalents in circuit operation.

Q: Can parts with extended temperature range (-55°C to 150°C) be used in applications rated for -55°C to 125°C?

A: Yes. Extended temperature range capability is a superset of the original specification. Parts rated for -55°C to 150°C operate within the -55°C to 125°C range without performance degradation and provide additional margin for thermal stress conditions.

Q: What is the significance of the 1.8Ω ESR specification?

A: ESR (Equivalent Series Resistance) represents the internal resistance of the capacitor and affects ripple current handling and voltage drop characteristics. All substitute parts maintain the 1.8Ω ESR specification, ensuring equivalent performance in high-frequency and high-current applications.

Q: Are there inventory considerations when selecting substitute parts?

A: Yes. Current inventory levels vary by part number and supplier. T491C685M035AT (5196 pcs), 293D685X0035C2TE3 (2623 pcs), and TH3C685K035E1800 (1021 pcs) show higher availability compared to other alternatives. Procurement timelines should account for supplier stock levels.

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