T355F685M035AT Equivalent & Substitute Parts

Part Overview

The T355F685M035AT is a 6.8 µF conformal coated tantalum capacitor rated for 35 V operation in a radial through-hole package. Manufactured by KEMET as part of the T355 UltraDip II series, this component is designed for general-purpose applications requiring reliable energy storage in compact form factors. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design optimization, or application-specific tolerance requirements.

Substiute Parts

T355F685M035AT

KEMETIn Stock: 1149T355F685M035AT Datasheet

Current PartRFQ

T355F685K035AT

KEMETIn Stock: 970T355F685K035AT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T355F685M035AT is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance value: 6.8 µF
• Rated voltage: 35 V
• Mounting type: Through Hole
• Package type: Radial
• Physical dimensions: 0.236" diameter, 0.441" maximum height, 0.125" lead spacing
• ESR specification: 2.5 Ohm @ 100kHz
• Operating temperature range: -55°C to 125°C
• Conformal coating type
• Series designation: T355 UltraDip II

Allowable Variation Parameters:

• Tolerance: Tighter tolerance specifications (±10%) are acceptable substitutes for ±20% applications

The substitute part T355F685K035AT meets all mandatory matching parameters while providing improved tolerance specification, making it functionally and mechanically interchangeable.

Parameter Comparison

Engineering Selection Recommendations

Both the T355F685M035AT and T355F685K035AT are Active products with full regulatory compliance. Selection between these parts is based on tolerance requirements and application specifications:

T355F685M035AT Selection Criteria:

• Applications tolerating ±20% capacitance variation
• Cost-optimized designs where tighter tolerance is not required
• General-purpose filtering and energy storage functions

T355F685K035AT Selection Criteria:

• Applications requiring ±10% capacitance tolerance
• Precision circuits where tighter tolerance improves performance predictability
• Designs where tolerance stack-up analysis demands superior component accuracy

Both parts maintain identical electrical performance characteristics (ESR, voltage rating, temperature range) and mechanical compatibility (footprint, lead spacing, package dimensions). The substitute part T355F685K035AT provides enhanced tolerance specification without any compromise to physical or electrical parameters, making it universally compatible with T355F685M035AT applications.

Frequently Asked Questions (FAQ)

Q: Can T355F685K035AT replace T355F685M035AT in existing designs?

A: Yes. The T355F685K035AT is mechanically and electrically compatible with T355F685M035AT. All physical dimensions, lead spacing, voltage rating, ESR characteristics, and operating temperature range are identical. The substitute part provides tighter tolerance specification (±10% versus ±20%), which is an improvement for the original application.

Q: What is the primary difference between these two parts?

A: The sole difference is capacitance tolerance. T355F685M035AT specifies ±20% tolerance, while T355F685K035AT specifies ±10% tolerance. All other electrical and mechanical parameters are identical.

Q: Are both parts suitable for the same PCB footprint?

A: Yes. Both parts share identical physical dimensions: 0.236" diameter, 0.441" maximum seated height, and 0.125" lead spacing. They are direct mechanical substitutes requiring no PCB layout modifications.

Q: Do these parts have the same regulatory compliance?

A: Yes. Both T355F685M035AT and T355F685K035AT are ROHS3 compliant and REACH unaffected. Both maintain Active product status with identical environmental and regulatory designations.

Q: Which part should be selected for new designs?

A: Selection depends on tolerance requirements. For applications where ±10% tolerance improves circuit performance or meets design specifications, T355F685K035AT is the appropriate choice. For applications where ±20% tolerance is acceptable, either part is suitable based on availability and cost considerations.

Q: Are the ESR and operating temperature specifications identical?

A: Yes. Both parts specify 2.5 Ohm ESR @ 100kHz and identical operating temperature range of -55°C to 125°C. Electrical performance characteristics are equivalent.