T491C684M050AT Equivalent & Substitute Parts

Part Overview

The T491C684M050AT is a molded tantalum capacitor manufactured by KEMET, part of the T491 series. This component is rated at 0.68 µF capacitance with a 50 V voltage rating and ±20% tolerance. The device is designed for surface mount applications in the 2312 (6032 Metric) package format. The part is currently in active production status and is ROHS3 compliant. Equivalent and substitute parts are identified when design requirements allow for parameter variations within acceptable engineering tolerances, such as tolerance specifications or inventory availability considerations.

Substiute Parts

T491C684M050AT

KEMETIn Stock: 864T491C684M050AT Datasheet

Current PartRFQ

T491C684K050AT

KEMETIn Stock: 1401T491C684K050AT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491C684M050AT is determined by strict equivalence in the following critical parameters:

• Capacitance Value: 0.68 µF (exact match required)
• Voltage Rating: 50 V (exact match required)
• Package / Case: 2312 (6032 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Molded Tantalum (exact match required)
• ESR: 6.4 Ohm (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Lifetime @ Temp.: 2000 Hrs @ 125°C (exact match required)

The tolerance specification (±20% vs. ±10%) is the primary variable parameter that distinguishes substitute parts within this equivalence group. Substitutes maintain all other electrical and mechanical characteristics while offering alternative tolerance grades.

Parameter Comparison

Engineering Selection Recommendations

Selection between T491C684M050AT and T491C684K050AT is based on tolerance requirements and regulatory compliance:

T491C684M050AT (±20% Tolerance): Select this part when design specifications permit a wider capacitance tolerance band. Both parts maintain identical electrical performance characteristics, voltage ratings, and thermal specifications. This part is ROHS3 compliant and REACH unaffected.

T491C684K050AT (±10% Tolerance): Select this part when design specifications require tighter capacitance tolerance control. This substitute provides improved tolerance performance while maintaining all other electrical and mechanical parameters. This part is also ROHS3 compliant and REACH unaffected.

Both parts are active products from KEMET with identical product status, compliance certifications, and operational characteristics. Selection depends solely on tolerance requirements for the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can T491C684K050AT replace T491C684M050AT in my circuit?

A: Yes, T491C684K050AT is a direct substitute when tolerance requirements allow. The ±10% tolerance of the K-grade part is tighter than the ±20% tolerance of the M-grade part, making it suitable for applications requiring improved capacitance accuracy. All other electrical and mechanical parameters are identical.

Q: What is the difference between the M and K tolerance grades?

A: The M-grade (T491C684M050AT) specifies ±20% capacitance tolerance, while the K-grade (T491C684K050AT) specifies ±10% tolerance. Both grades maintain the same 0.68 µF nominal capacitance value at 50 V. The K-grade provides tighter tolerance control for applications requiring higher capacitance accuracy.

Q: Are both parts in the same physical package?

A: Yes. Both T491C684M050AT and T491C684K050AT use the identical 2312 (6032 Metric) package with dimensions of 0.236" L x 0.126" W (6.00mm x 3.20mm) and maximum seated height of 0.110" (2.80mm). They are directly interchangeable from a mechanical and PCB layout perspective.

Q: Do both parts have the same ESR specification?

A: Yes. Both parts specify 6.4 Ohm ESR (Equivalent Series Resistance), ensuring identical electrical performance characteristics in terms of series resistance behavior.

Q: Are both parts RoHS compliant?

A: Yes. Both T491C684M050AT and T491C684K050AT are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operating temperature range for both parts?

A: Both parts operate across the identical temperature range of -55°C to 125°C with a lifetime specification of 2000 hours at 125°C.

Q: Can I use these parts interchangeably on the same PCB assembly?

A: Yes. Both parts are surface mount components in the identical 2312 package format and can be used interchangeably from assembly and placement perspectives. Selection should be based on circuit tolerance requirements.