T494B686M010AT Equivalent & Substitute Parts

Part Overview

The T494B686M010AT is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 10 V operation in a 1411 (3528 Metric) surface mount package. This component is designed for general-purpose applications requiring stable capacitance and low equivalent series resistance (ESR) in compact form factors. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements permit tolerance of variations in specific electrical parameters while maintaining functional compatibility within the same package footprint and voltage rating.

Substiute Parts

T494B686M010AT

KEMETIn Stock: 1950T494B686M010AT Datasheet

Current PartRFQ

T491B686M010AT

KEMETIn Stock: 67294T491B686M010AT Datasheet

UpgradeRFQ

TPSB686K010R0600

KYOCERA AVXIn Stock: 53880TPSB686K010R0600 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T494B686M010AT is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 10 V (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)

Allowable Variation Parameters:

• Tolerance: ±20% (main part) to ±10% (substitute) — tighter tolerance is acceptable
• ESR (Equivalent Series Resistance): 1.5 Ohm (main part) to 1 Ohm or 600 mOhm (substitutes) — lower ESR is acceptable
• Manufacturer: KEMET or alternative qualified manufacturers (KYOCERA AVX)
• Series designation: T494, T491, or TPS series

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

T491B686M010AT (KEMET Upgrade Substitute):

The T491B686M010AT is a direct upgrade substitute within the KEMET product family. It maintains identical capacitance, voltage rating, package dimensions, and temperature operating range. The primary improvement is reduced ESR from 1.5 Ohm to 1 Ohm, which decreases impedance and heat generation in the circuit. Both parts carry identical RoHS3 compliance, MSL 1 rating, and REACH unaffected status. This substitute is suitable for applications where lower ESR performance is beneficial or required.

TPSB686K010R0600 (KYOCERA AVX Similar Substitute):

The TPSB686K010R0600 from KYOCERA AVX meets all mandatory electrical and mechanical parameters. It provides further ESR reduction to 600 mOhm and tighter capacitance tolerance (±10% versus ±20%), both of which represent performance improvements. The part maintains identical package footprint, voltage rating, temperature range, and compliance certifications. This substitute is suitable for applications requiring enhanced electrical performance or tighter capacitance specifications.

Both substitutes are in active production with confirmed inventory availability and full regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can T491B686M010AT replace T494B686M010AT in any application?

A: Yes. The T491B686M010AT is a direct substitute. Both parts share identical capacitance (68 µF), voltage rating (10 V), package (1411/3528 Metric), temperature range (-55°C to 125°C), and physical dimensions. The T491B686M010AT offers improved performance with lower ESR (1 Ohm versus 1.5 Ohm).

Q: What is the difference between ±20% and ±10% tolerance?

A: Tolerance specifies the allowable deviation from the nominal 68 µF capacitance value. ±20% tolerance permits values between 54.4 µF and 81.6 µF. ±10% tolerance permits values between 61.2 µF and 74.8 µF. The ±10% tolerance of TPSB686K010R0600 is tighter and more restrictive, suitable for applications requiring closer capacitance accuracy.

Q: Does lower ESR affect circuit performance?

A: ESR (Equivalent Series Resistance) directly impacts impedance and heat dissipation. Lower ESR reduces impedance and heat generation. Both substitute parts (1 Ohm and 600 mOhm) have lower ESR than the main part (1.5 Ohm), resulting in improved electrical performance. Circuit compatibility is maintained across all three parts.

Q: Are all three parts physically interchangeable?

A: Yes. All three parts use the 1411 (3528 Metric) package with identical dimensions: 0.138" L x 0.110" W (3.50mm x 2.80mm) and maximum height of 0.083" (2.10mm). They are directly interchangeable on PCBs designed for this package footprint.

Q: Do compliance certifications differ between the parts?

A: No. All three parts carry identical compliance status: ROHS3 Compliant, MSL 1 (Unlimited), REACH Unaffected, and ECCN EAR99. Regulatory and environmental requirements are met uniformly across all substitutes.

Q: What is the lifetime specification for these capacitors?

A: The T494B686M010AT and T491B686M010AT specify 2000 hours lifetime at 125°C. The TPSB686K010R0600 does not provide a specified lifetime value in the available data.

Q: Which substitute should be selected for new designs?

A: Selection depends on application requirements. For direct replacement with improved ESR, select T491B686M010AT. For maximum performance with tighter tolerance and lowest ESR, select TPSB686K010R0600. All three parts are suitable for general-purpose applications within the specified electrical and thermal parameters.