Equivalent & Substitute Parts for T491B106M010AT4021

Part Overview

The T491B106M010AT4021 is a 10 µF molded tantalum capacitor manufactured by KEMET, rated at 10 V with ±20% tolerance. This component operates across the temperature range of -55°C to 125°C with a lifetime specification of 2000 hours at 125°C. The part is housed in a 1411 (3528 Metric) surface mount package with 3Ohm equivalent series resistance and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when design requirements allow for variations in tolerance, ESR characteristics, or manufacturer selection while maintaining the core electrical and mechanical specifications: 10 µF capacitance, 10 V rated voltage, 1411 package, and surface mount configuration.

Key Parameters

Parameter	Value	Criticality for Substitution
Capacitance	10 µF	Fixed - must match exactly
Voltage Rating	10 V	Fixed - must match exactly
Tolerance	±20%	Variable - ±10% acceptable as tighter tolerance
Package / Case	1411 (3528 Metric)	Fixed - must match exactly
Mounting Type	Surface Mount	Fixed - must match exactly
ESR	3Ohm	Variable - lower ESR acceptable
Operating Temperature	-55°C ~ 125°C	Fixed - must match exactly
Lifetime @ Temp.	2000 Hrs @ 125°C	Fixed - must match exactly
Type	Molded Tantalum	Fixed - must match exactly

Substitute Part Grouping Explanation

Substitution logic is based on the following allowed parameter variations:

Fixed Parameters (No Variation Allowed):

Capacitance: 10 µF
Voltage Rating: 10 V
Package / Case: 1411 (3528 Metric)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 125°C
Lifetime: 2000 Hrs @ 125°C
Type: Molded Tantalum

Variable Parameters (Substitution Allowed):

Tolerance: ±20% (main part) can be substituted with ±10% (tighter tolerance acceptable)
ESR: 3Ohm (main part) can be substituted with lower ESR values (750mOhm, 800mOhm, 2.1Ohm)
Manufacturer: KEMET or Cal-Chip Electronics, Inc.
Series: T491, T494, T495, or TC series
RoHS Status: ROHS3 Compliant or RoHS Compliant acceptable; RoHS non-compliant noted where applicable

Substitute parts are grouped into two categories:

Category A - Same Tolerance (±20%):

T491B106M010AT7280 (KEMET T491 series, different tape code)
T495B106M010ATE750 (KEMET T495 series, lower ESR)
TCMIA106BT (Cal-Chip Electronics TC series, lower ESR)

Category B - Tighter Tolerance (±10%):

T491B106K010AT7280 (KEMET T491 series)
T494B106K010AH (KEMET T494 series, lower ESR, RoHS non-compliant)
T495B106K010ATE3K0 (KEMET T495 series, lower ESR)
TCKIA106BT (Cal-Chip Electronics TC series, lower ESR)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance	Tolerance	Voltage	Package	ESR	Operating Temp.	Lifetime @ 125°C	RoHS Status	Inventory (Pcs)
T491B106M010AT4021	KEMET	T491	10 µF	±20%	10 V	1411	3Ohm	-55°C ~ 125°C	2000 Hrs	ROHS3	846
T491B106M010AT7280	KEMET	T491	10 µF	±20%	10 V	1411	3Ohm	-55°C ~ 125°C	2000 Hrs	ROHS3	8652
T491B106K010AT7280	KEMET	T491	10 µF	±10%	10 V	1411	3Ohm	-55°C ~ 125°C	2000 Hrs	ROHS3	8309
T494B106K010AH	KEMET	T494	10 µF	±10%	10 V	1411	800mOhm @ 100kHz	-55°C ~ 125°C	2000 Hrs	RoHS non-compliant	2909
T495B106K010ATE3K0	KEMET	T495	10 µF	±10%	10 V	1411	3Ohm @ 100kHz	-55°C ~ 125°C	2000 Hrs	ROHS3	1847
T495B106M010ATE750	KEMET	T495	10 µF	±20%	10 V	1411	750mOhm @ 100kHz	-55°C ~ 125°C	2000 Hrs	ROHS3	4111
TCKIA106BT	Cal-Chip Electronics	TC	10 µF	±10%	10 V	1411	2.1Ohm	-55°C ~ 125°C	2000 Hrs	RoHS Compliant	129007
TCMIA106BT	Cal-Chip Electronics	TC	10 µF	±20%	10 V	1411	2.1Ohm	-55°C ~ 125°C	2000 Hrs	RoHS Compliant	129118

Engineering Selection Recommendations

For Direct Replacement (Same Tolerance ±20%):

T491B106M010AT7280 is the primary equivalent, offering identical electrical specifications and ROHS3 compliance with significantly higher inventory availability (8652 pcs vs. 846 pcs). This part differs only in tape code designation.

T495B106M010ATE750 provides equivalent functionality with reduced ESR (750mOhm @ 100kHz vs. 3Ohm), maintaining ±20% tolerance and ROHS3 compliance. Lower ESR may improve high-frequency performance characteristics.

TCMIA106BT (Cal-Chip Electronics) offers equivalent specifications with lower ESR (2.1Ohm) and RoHS compliance, with substantially higher inventory (129118 pcs). This part is suitable for applications where manufacturer diversification is acceptable.

For Tighter Tolerance Applications (±10%):

T491B106K010AT7280 maintains KEMET T491 series consistency with ±10% tolerance and ROHS3 compliance, offering higher inventory (8309 pcs).

T495B106K010ATE3K0 provides ±10% tolerance with 3Ohm ESR @ 100kHz and ROHS3 compliance, suitable for precision applications.

TCKIA106BT (Cal-Chip Electronics) delivers ±10% tolerance with lower ESR (2.1Ohm) and RoHS compliance, with the highest inventory availability (129007 pcs).

Not Recommended for New Designs:

T494B106K010AH is RoHS non-compliant and should not be selected for applications requiring regulatory compliance.

Compliance Considerations:

All recommended substitutes maintain the required operating temperature range (-55°C ~ 125°C), lifetime specification (2000 Hrs @ 125°C), and MSL 1 (Unlimited) moisture sensitivity level. ROHS3 compliance is maintained across KEMET T491, T495 series and Cal-Chip TC series parts. RoHS compliance (non-ROHS3) is available through Cal-Chip Electronics TC series.

Frequently Asked Questions (FAQ)

Q: Can T491B106K010AT7280 (±10% tolerance) be used in place of T491B106M010AT4021 (±20% tolerance)?

A: Yes. The ±10% tolerance is tighter than the ±20% specification, making it electrically compatible. The part operates within the same voltage, capacitance, temperature, and lifetime parameters. This substitution is suitable for applications where tighter tolerance improves circuit performance.

Q: What is the difference between KEMET T491, T494, and T495 series?

A: All three series share identical capacitance (10 µF), voltage (10 V), package (1411), and temperature specifications. The primary differences are ESR characteristics and RoHS compliance status. T491 series has 3Ohm ESR. T494 series has 800mOhm ESR but is RoHS non-compliant. T495 series has lower ESR (750mOhm or 3Ohm depending on part number) and is ROHS3 compliant.

Q: Can Cal-Chip Electronics TCKIA106BT or TCMIA106BT replace KEMET parts?

A: Yes. Both Cal-Chip parts maintain identical capacitance, voltage, package, temperature range, and lifetime specifications. They feature lower ESR (2.1Ohm) and are RoHS compliant. Manufacturer substitution is acceptable when circuit design does not require specific KEMET series characteristics.

Q: Does ESR variation affect circuit performance?

A: ESR is provided as a specified parameter. Lower ESR values (750mOhm, 800mOhm, 2.1Ohm) compared to the main part (3Ohm) may alter high-frequency impedance characteristics. Circuit design determines whether ESR variation is acceptable. No testing or verification is required if the substitute part's ESR is within the application's design tolerance.

Q: Are all substitute parts in the same 1411 (3528 Metric) package?

A: Yes. All substitute parts listed use the 1411 (3528 Metric) surface mount package with identical dimensions (0.138" L x 0.110" W / 3.50mm x 2.80mm) and maximum seated height (0.083" / 2.10mm). Direct PCB footprint compatibility is confirmed.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 refers to compliance with the third iteration of the Restriction of Hazardous Substances directive. RoHS Compliant indicates general RoHS compliance. Both designations indicate the part meets hazardous substance restrictions. ROHS3 is the current standard. Parts marked as RoHS non-compliant do not meet these restrictions and should not be used in applications requiring regulatory compliance.

Q: Can I use T495B106M010ATE750 if my circuit requires 3Ohm ESR?

A: No. T495B106M010ATE750 has 750mOhm ESR @ 100kHz, which differs from the 3Ohm specification. If circuit design requires 3Ohm ESR, select T491B106M010AT7280, T491B106K010AT7280, or T495B106K010ATE3K0.

Q: Which substitute offers the best inventory availability?

A: TCKIA106BT (Cal-Chip Electronics) has the highest inventory at 129007 pcs, followed by TCMIA106BT at 129118 pcs. Both Cal-Chip parts offer substantially higher availability than KEMET alternatives.

Q: Is tape code designation (AT4021 vs. AT7280) significant for substitution?

A: Tape code designation indicates packaging configuration for automated assembly. T491B106M010AT4021 and T491B106M010AT7280 are electrically and mechanically identical; the tape code difference does not affect component performance or compatibility.

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