Equivalent & Substitute Parts for T491B335K035AT

Part Overview

The T491B335K035AT is a 3.3 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V with ±10% tolerance. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for general purpose applications in compact 1411 (3528 Metric) package form. The part maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified to support procurement flexibility, inventory optimization, and supply chain continuity while maintaining electrical and mechanical compatibility.

Substiute Parts

T491B335K035AT

KEMETIn Stock: 1504T491B335K035AT Datasheet

Current PartRFQ

T491B335M035AT

KEMETIn Stock: 8341T491B335M035AT Datasheet

SimilarRFQ

293D335X9035B2TE3

Vishay SpragueIn Stock: 12492293D335X9035B2TE3 Datasheet

DirectRFQ

TAJB335K035RNJ

KYOCERA AVXIn Stock: 10151TAJB335K035RNJ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491B335K035AT are grouped based on strict electrical and mechanical parameter alignment. All identified substitutes maintain the following critical parameters: 3.3 µF capacitance, 35 V voltage rating, 1411 (3528 Metric) package, 3.5 Ohm ESR, -55°C to 125°C operating temperature range, surface mount configuration, and ROHS3 compliance.

Group 1: Same Tolerance (±10%) Parts T491B335K035AT (KEMET) and 293D335X9035B2TE3 (Vishay Sprague) and TAJB335K035RNJ (KYOCERA AVX) share identical tolerance specifications. These parts are direct functional equivalents with no circuit re-validation required.

Group 2: Relaxed Tolerance (±20%) Part T491B335M035AT (KEMET) operates at ±20% tolerance instead of ±10%. This substitute is acceptable only when circuit design permits the wider capacitance variance. The relaxed tolerance does not affect other electrical or mechanical parameters.

All substitutes are Active products with ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (No Circuit Re-validation Required)

T491B335K035AT, 293D335X9035B2TE3, and TAJB335K035RNJ are direct functional equivalents. All three parts maintain identical electrical specifications (3.3 µF, ±10% tolerance, 35 V, 3.5 Ohm ESR) and mechanical compatibility (1411 package, surface mount). Selection among these three is based on availability, lead time, and procurement cost. All parts are Active products with ROHS3 compliance and MSL 1 rating.

Conditional Substitute (Circuit Validation Required)

T491B335M035AT is acceptable as a substitute only when the circuit design accommodates ±20% capacitance tolerance. The relaxed tolerance specification does not affect voltage rating, ESR, temperature range, or package compatibility. This part offers higher inventory availability (8320 Pcs) compared to the primary part (1452 Pcs). Circuit designers must confirm that the wider tolerance band does not impact filter response, timing accuracy, or other capacitance-dependent functions before implementation.

Compliance and Regulatory Status

All identified substitutes maintain ROHS3 compliance and REACH Unaffected status, ensuring compatibility with current environmental and regulatory requirements. MSL 1 rating across all parts indicates unlimited moisture sensitivity, supporting standard storage and handling procedures without special precautions.

Frequently Asked Questions (FAQ)

Q: Can T491B335M035AT replace T491B335K035AT in all applications?

A: T491B335M035AT differs only in tolerance specification (±20% versus ±10%). Substitution is valid only when circuit design permits the wider capacitance variance. Applications with strict capacitance requirements, such as precision filters or timing circuits, require circuit re-validation before substitution.

Q: Are the Vishay Sprague 293D335X9035B2TE3 and KYOCERA AVX TAJB335K035RNJ direct replacements?

A: Yes. Both parts match all critical electrical and mechanical parameters of the T491B335K035AT: 3.3 µF capacitance, ±10% tolerance, 35 V rating, 3.5 Ohm ESR, 1411 package, and surface mount configuration. No circuit modifications are required for substitution.

Q: What is the significance of the 1411 (3528 Metric) package specification?

A: The 1411 package designation defines the physical footprint and mounting pad layout on the PCB. All identified substitutes use this identical package, ensuring direct PCB compatibility without layout modifications. The package also specifies maximum height (2.10-2.11mm), critical for applications with space constraints.

Q: Does ESR (Equivalent Series Resistance) affect substitution decisions?

A: Yes. All identified substitutes maintain 3.5 Ohm ESR, matching the primary part specification. ESR directly impacts circuit performance in filtering, ripple current handling, and transient response. Substitutes with different ESR values would require circuit re-validation and are not included in this equivalency list.

Q: Are there packaging format differences among the substitutes?

A: The primary part and most substitutes are supplied in Tape & Reel (TR) format. TAJB335K035RNJ is available in Cut Tape (CT) & Digi-Reel® format. Both packaging formats are compatible with standard pick-and-place assembly equipment. Format selection depends on production volume and assembly line configuration.

Q: What is the operational temperature range significance?

A: All substitutes operate across -55°C to 125°C, matching the primary part specification. This range supports industrial and automotive applications. Substitutes with different temperature ranges are not included in this equivalency list, as they would not be suitable for applications requiring the full specified range.

Q: How does MSL 1 (Unlimited) rating affect handling and storage?

A: MSL 1 rating indicates the component has unlimited moisture sensitivity, requiring no special moisture control or baking procedures before soldering. All identified substitutes share this rating, ensuring identical handling and storage requirements across the entire substitute group.

Q: What inventory considerations apply to substitute selection?

A: Current inventory levels are: T491B335K035AT (1452 Pcs), T491B335M035AT (8320 Pcs), 293D335X9035B2TE3 (12400 Pcs), and TAJB335K035RNJ (10100 Pcs). Higher inventory availability for substitutes may support shorter lead times and reduced procurement costs, provided electrical and mechanical compatibility requirements are met.