T491B335M035AS Equivalent & Substitute Parts

Part Overview

The T491B335M035AS is a 3.3 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V with ±20% tolerance and 3.5Ω equivalent series resistance (ESR). This component operates across the temperature range of -55°C to 125°C and is housed in a 1411 (3528 Metric) surface mount package. 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	3.3 µF
Voltage Rating	35 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	3.5Ω
Package / Case	1411 (3528 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 T491B335M035AS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 3.3 µF (exact match required)
Voltage Rating: 35 V (exact match required)
Package / Case: 1411 (3528 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
ESR: 3.5Ω (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

Tolerance: ±20% or ±10% (tighter tolerance acceptable as upgrade)
Operating Temperature Range: -55°C ~ 125°C or -55°C ~ 150°C (extended range acceptable as upgrade)
Product Status: Active substitutes preferred over obsolete
RoHS Compliance: Upgrades to compliant versions where available

Substitute parts are grouped into two categories: direct equivalents (matching tolerance) and upgrade alternatives (improved tolerance or temperature range).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage	ESR	Package	Temp. Range	Product Status	RoHS Status
T491B335M035AS	KEMET	3.3 µF	±20%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 125°C	Obsolete	RoHS non-compliant
T491B335M035AT	KEMET	3.3 µF	±20%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 125°C	Active	RoHS3 Compliant
T491B335K035AH	KEMET	3.3 µF	±10%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 125°C	Active	RoHS non-compliant
TH3B335M035E3500	Vishay Sprague	3.3 µF	±20%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 150°C	Active	RoHS non-compliant
TH3B335K035E3500	Vishay Sprague	3.3 µF	±10%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 150°C	Active	RoHS non-compliant
TH3B335M035F3500	Vishay Sprague	3.3 µF	±20%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 150°C	Active	RoHS non-compliant
TH3B335K035F3500	Vishay Sprague	3.3 µF	±10%	35 V	3.5Ω	1411 (3528 Metric)	-55°C ~ 150°C	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Direct Equivalent: T491B335M035AT (KEMET) is the direct functional equivalent to T491B335M035AS. Both components share identical electrical specifications (3.3 µF, ±20% tolerance, 35 V, 3.5Ω ESR) and mechanical packaging (1411 / 3528 Metric). The T491B335M035AT is active in production and RoHS3 compliant, addressing the obsolescence of the original part while maintaining full electrical compatibility.

Upgrade Alternatives with Improved Tolerance: T491B335K035AH (KEMET) and TH3B335K035E3500 / TH3B335K035F3500 (Vishay Sprague) provide ±10% tolerance, a tighter specification than the original ±20%. These parts are suitable for applications requiring improved capacitance accuracy. The Vishay Sprague variants additionally extend the operating temperature range to -55°C ~ 150°C and carry AEC-Q200 automotive qualification.

Upgrade Alternatives with Extended Temperature Range: TH3B335M035E3500 and TH3B335M035F3500 (Vishay Sprague) maintain the ±20% tolerance while extending the operating temperature range to -55°C ~ 150°C. These parts are qualified to AEC-Q200 automotive standards and are suitable for applications requiring enhanced thermal performance.

Compliance Considerations: For applications requiring RoHS3 compliance, T491B335M035AT is the only option among active parts. All Vishay Sprague alternatives (TH3 series) are RoHS non-compliant but carry AEC-Q200 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can T491B335K035AH replace T491B335M035AS directly? A: Yes. T491B335K035AH is electrically and mechanically compatible. The ±10% tolerance is tighter than the original ±20%, making it suitable as an upgrade. Both operate across -55°C ~ 125°C and use the 1411 (3528 Metric) package.

Q: What is the difference between KEMET T491 series and Vishay Sprague TH3 series substitutes? A: Both series meet the core electrical requirements (3.3 µF, 35 V, 3.5Ω ESR, 1411 package). Vishay Sprague TH3 variants extend the operating temperature to -55°C ~ 150°C and carry AEC-Q200 automotive qualification. KEMET T491B335M035AT offers RoHS3 compliance.

Q: Are the Vishay Sprague TH3B335M035F3500 and TH3B335K035F3500 interchangeable? A: Both parts are mechanically and electrically compatible with T491B335M035AS. The difference is tolerance: TH3B335M035F3500 has ±20% tolerance (direct match), while TH3B335K035F3500 has ±10% tolerance (upgrade). Both operate -55°C ~ 150°C.

Q: Does packaging differ between substitute parts? A: No. All substitute parts use the 1411 (3528 Metric) surface mount package with identical dimensions: 0.138" L × 0.110" W (3.50mm × 2.80mm) and maximum seated height of 0.083" (2.10mm).

Q: Which substitute is recommended for new designs? A: T491B335M035AT (KEMET) for RoHS3-compliant applications, or TH3B335M035F3500 / TH3B335K035F3500 (Vishay Sprague) for automotive applications requiring AEC-Q200 qualification and extended temperature range.

Q: Is ESR specification identical across all substitutes? A: Yes. All substitute parts maintain 3.5Ω ESR, matching the original T491B335M035AS specification.

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