T491A104M035AT7621 Equivalent & Substitute Parts

Part Overview

The T491A104M035AT7621 is a 0.1 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V with ±20% tolerance in a 1206 (3216 Metric) surface mount package. This component is classified as Active product status and is designed for general purpose applications requiring stable capacitance performance across industrial temperature ranges. Substitute parts are identified when equivalent electrical characteristics and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

T491A104M035AT7621

KEMETIn Stock: 1159T491A104M035AT7621 Datasheet

Current PartRFQ

TAJA104M035RNJ

KYOCERA AVXIn Stock: 3329TAJA104M035RNJ Datasheet

Parametric EquivalentRFQ

TCKIV104AT

Cal-Chip Electronics, Inc.In Stock: 47146TCKIV104AT Datasheet

Parametric EquivalentRFQ

TCMIV104AT

Cal-Chip Electronics, Inc.In Stock: 47124TCMIV104AT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491A104M035AT7621 is valid when the following core parameters remain constant:

• Capacitance Value: 0.1 µF (exact match required)
• Voltage Rating: 35 V (minimum requirement; higher ratings are not substitutable downward)
• Package / Case: 1206 (3216 Metric) (physical and electrical footprint compatibility)
• Mounting Type: Surface Mount (PCB assembly process compatibility)
• Operating Temperature Range: -55°C ~ 125°C (functional performance envelope)
• Type: Molded Tantalum (material and construction class)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (handling and storage requirements)

Tolerance variations (±10% versus ±20%) and ESR (Equivalent Series Resistance) differences within acceptable ranges do not preclude substitution when the primary electrical and mechanical parameters align. All substitute parts listed maintain Active product status and full compliance with applicable standards.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full compatibility with the T491A104M035AT7621 based on electrical and mechanical parameters. Selection among these alternatives is determined by the following factors:

TAJA104M035RNJ (KYOCERA AVX): This substitute provides exact tolerance matching (±20%) and equivalent ESR performance (24 Ohm @ 100kHz). It is suitable for direct replacement in applications where the original KEMET part is unavailable. Active product status and ROHS3 compliance ensure regulatory alignment.

TCKIV104AT (Cal-Chip Electronics, Inc.): This substitute offers tighter tolerance specification (±10%) compared to the original part (±20%). The ±10% tolerance provides enhanced capacitance accuracy for applications requiring stricter component value control. ESR is specified at 24 Ohm, which is within acceptable operational parameters. Active product status and ROHS3 compliance are maintained.

TCMIV104AT (Cal-Chip Electronics, Inc.): This substitute matches the original tolerance specification (±20%) and provides equivalent ESR performance (24 Ohm). It is functionally interchangeable with the T491A104M035AT7621 across all critical parameters. Active product status and ROHS3 compliance are confirmed.

All substitute parts are classified as Active products, ensuring continued availability and manufacturer support. ROHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) rating are consistent across all options, eliminating regulatory or handling concerns during substitution.

Frequently Asked Questions (FAQ)

Q: Can TCKIV104AT be used as a direct replacement for T491A104M035AT7621?

A: Yes. TCKIV104AT is a direct substitute. Both parts share identical capacitance (0.1 µF), voltage rating (35 V), package (1206), and operating temperature range (-55°C ~ 125°C). The primary difference is tolerance specification: TCKIV104AT offers ±10% tolerance versus the original ±20%. This tighter tolerance does not prevent substitution and may provide improved performance in applications sensitive to capacitance variation.

Q: What is the difference between TAJA104M035RNJ and TCMIV104AT?

A: Both parts are functionally equivalent to the original T491A104M035AT7621. TAJA104M035RNJ is manufactured by KYOCERA AVX, while TCMIV104AT is manufactured by Cal-Chip Electronics, Inc. Both maintain ±20% tolerance, 35 V rating, and 1206 package specifications. ESR values are comparable (24 Ohm @ 100kHz for TAJA104M035RNJ and 24 Ohm for TCMIV104AT). Selection between these two is based on supplier availability and procurement preferences.

Q: Are there any ESR differences that affect circuit performance?

A: The original T491A104M035AT7621 specifies 20 Ohm ESR, while all substitute parts specify 24 Ohm ESR. This 4 Ohm difference is within acceptable operational margins for general purpose tantalum capacitor applications. ESR impact on circuit performance is application-dependent; designs with strict ESR requirements should be evaluated against specific circuit parameters.

Q: Can these substitutes be used in high-temperature applications?

A: Yes. All substitute parts, including the original T491A104M035AT7621, are rated for operation across the -55°C ~ 125°C temperature range with 2000 hours lifetime at 125°C. They are suitable for high-temperature applications within this specification envelope.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All substitute parts listed are supplied in Tape & Reel (TR) packaging, matching the original part's packaging format. This ensures compatibility with automated PCB assembly processes.

Q: Do substitute parts meet the same compliance standards as the original?

A: Yes. All substitute parts are ROHS3 Compliant, REACH Unaffected, and classified as MSL 1 (Unlimited). Regulatory and environmental compliance is equivalent across all options.

Q: Which substitute should be selected for maximum capacitance accuracy?

A: TCKIV104AT offers ±10% tolerance, providing tighter capacitance accuracy compared to the original ±20% specification. This part is appropriate for applications requiring enhanced component value precision.