T491C106M016AS Equivalent & Substitute Parts

Part Overview

The T491C106M016AS is a 10 µF molded tantalum capacitor rated at 16 V with ±20% tolerance, manufactured by KEMET in the 2312 (6032 Metric) package. This part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Suitable alternatives maintain the core electrical specifications while offering improved availability and product status.

Key Parameters

Parameter	Value
Capacitance	10 µF
Voltage Rating	16 V
Tolerance	±20%
Type	Molded Tantalum
ESR (Equivalent Series Resistance)	1.8 Ohm
Operating Temperature Range	-55°C to 125°C
Package / Case	2312 (6032 Metric)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the T491C106M016AS is determined by the following criteria:

Direct Electrical Equivalents maintain identical capacitance (10 µF), voltage rating (16 V), tolerance (±20%), ESR (1.8 Ohm), and package (2312/6032 Metric). These parts differ only in packaging format (Tape & Reel vs. bulk) or minor manufacturing code variations, making them pin-for-pin compatible.

Tolerance Upgrades provide tighter tolerance (±10% instead of ±20%) while maintaining all other electrical parameters and the same package. These are suitable when improved capacitance accuracy is required.

Voltage Upgrades increase the rated voltage to 20 V while preserving capacitance, tolerance options, and package dimensions. These provide additional voltage margin and are backward-compatible in applications where the original 16 V rating is sufficient.

Extended Temperature Variants (T499 series) operate to 175°C instead of 125°C, maintaining all other specifications. These are suitable for high-temperature applications.

Similar Package Alternatives (T494 series) use the 2311 (6028 Metric) package with slightly different dimensions and lower ESR (1 Ohm), providing functional equivalence with minor footprint differences.

Cross-Manufacturer Equivalents (Vishay Sprague 293D series) provide identical electrical and mechanical specifications with different manufacturer sourcing.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR	Package	Temp Range	Product Status	RoHS
T491C106M016AS	KEMET	10 µF	16 V	±20%	1.8 Ω	2312	-55 to 125°C	Obsolete	ROHS3
T491C106M016AT	KEMET	10 µF	16 V	±20%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3
T491C106K016AH	KEMET	10 µF	16 V	±10%	1.8 Ω	2312	-55 to 125°C	Active	Non-compliant
T491C106K016AT	KEMET	10 µF	16 V	±10%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3
T491C106K020AT	KEMET	10 µF	20 V	±10%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3
T491C106M020AT	KEMET	10 µF	20 V	±20%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3
T491U106K020AT	KEMET	10 µF	20 V	±10%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3
T499C106K016ATE1K8	KEMET	10 µF	16 V	±10%	1.8 Ω	2312	-55 to 175°C	Active	ROHS3
T499C106K020ATE1K8	KEMET	10 µF	20 V	±10%	1.8 Ω	2312	-55 to 175°C	Active	ROHS3
T494U106M016AH	KEMET	10 µF	16 V	±20%	1.0 Ω	2311	-55 to 125°C	Active	Non-compliant
293D106X0016C2TE3	Vishay Sprague	10 µF	16 V	±20%	1.8 Ω	2312	-55 to 125°C	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: T491C106M016AT

This part is the direct active equivalent of T491C106M016AS. It maintains identical electrical specifications (10 µF, 16 V, ±20%, 1.8 Ω ESR) and package (2312/6032 Metric). The only difference is packaging format (Tape & Reel vs. bulk). Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Secondary Recommendation: T491C106K016AT

This part upgrades tolerance to ±10% while maintaining all other specifications and the 2312 package. It is active and ROHS3 compliant. Select this variant when improved capacitance accuracy is required.

Voltage Margin Option: T491C106M020AT or T491C106K020AT

These parts increase voltage rating to 20 V while preserving capacitance and package. Both are active and ROHS3 compliant. Use when additional voltage headroom is beneficial for circuit reliability.

Extended Temperature Option: T499C106K016ATE1K8 or T499C106K020ATE1K8

These automotive-grade parts (AEC-Q200) extend operating temperature to 175°C. Select for high-temperature applications. Both are active and ROHS3 compliant.

Cross-Manufacturer Alternative: 293D106X0016C2TE3

Vishay Sprague TANTAMOUNT™ series provides identical specifications to the original part. This option enables dual-source qualification and supply chain diversification. Active status and ROHS3 compliance are confirmed.

Avoid: T491C106K016AH and T494U106M016AH

These parts carry RoHS non-compliance status and should not be selected for new designs requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can T491C106M016AT be used as a direct replacement for T491C106M016AS?

A: Yes. Both parts share identical electrical specifications (10 µF, 16 V, ±20%, 1.8 Ω ESR) and the same 2312 (6032 Metric) package. The difference is packaging format (Tape & Reel vs. bulk). Electrical and mechanical compatibility is complete.

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

A: Tolerance defines the allowable deviation from the nominal 10 µF capacitance value. ±20% allows deviation from 8 µF to 12 µF, while ±10% restricts deviation to 9 µF to 11 µF. Select ±10% when tighter capacitance accuracy is required for circuit performance.

Q: Can I use a 20 V rated part in place of a 16 V part?

A: Yes. A higher voltage rating is backward-compatible. The 20 V variants (T491C106M020AT, T491C106K020AT, T491U106K020AT) can be used in circuits designed for 16 V operation, providing additional voltage margin without affecting capacitance or other electrical characteristics.

Q: What is the significance of the T499 series extended temperature range?

A: The T499 series operates to 175°C compared to 125°C for standard T491 parts. These automotive-grade variants (AEC-Q200 rated) are required for high-temperature applications. Electrical specifications remain identical; the difference is thermal capability and automotive qualification.

Q: Why is the T494 series listed as a similar alternative rather than a direct substitute?

A: The T494U106M016AH uses the 2311 (6028 Metric) package instead of 2312, resulting in different footprint dimensions (0.236" L x 0.110" W vs. 0.236" L x 0.126" W). While electrically equivalent, PCB layout changes are required. Additionally, ESR is lower (1.0 Ω vs. 1.8 Ω) and RoHS compliance status differs.

Q: Is the Vishay Sprague 293D106X0016C2TE3 a suitable alternative?

A: Yes. This part provides identical electrical and mechanical specifications to T491C106M016AS. It enables cross-manufacturer sourcing and supply chain flexibility. Both parts are active and ROHS3 compliant.

Q: What packaging formats are available, and how do they differ?

A: Tape & Reel (TR) packaging is standard for automated assembly lines. Cut Tape (CT) & Digi-Reel® is suitable for lower-volume or mixed-component applications. Both formats contain the same component; the difference is presentation and handling method. Select based on assembly process requirements.

Q: Are there any compliance or regulatory differences between substitute options?

A: Most active substitutes are ROHS3 compliant. Exceptions include T491C106K016AH and T494U106M016AH, which are RoHS non-compliant and should not be selected for new designs. The T499 series carries AEC-Q200 automotive qualification, required only for automotive applications.

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