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KYOCERA AVX TAJB686K004RNJ — Specialty Capacitors

TAJB686K004RNJ – 68 µF Molded Tantalum Capacitor, 4 V

MPNTAJB686K004RNJ
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KYOCERA AVX TAJ series, molded tantalum capacitor, 68 µF, 4 V, ±10% tolerance, 1.8 Ohm ESR, -55°C to 125°C, size code B (1411 / 3528 Metric).

$0.7100Ref. price · indicative, final on quote
KYOCERA AVX TAJB686K004RNJ datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TAJB686K004RNJ specifications
ParameterValue
TypeMolded
SeriesTAJ
MountingSurface Mount
ESR1.8Ohm
Voltage - rated4 V
Operating temperature-55°C ~ 125°C
Size (Dimension)0.138\" L x 0.110\" W (3.50mm x 2.80mm)
Height - seated0.083\" (2.10mm)
PackageTape & Reel (TR) Cut Tape (CT)
FeaturesGeneral Purpose
Tolerance±10%
Capacitance68 µF
Case1411 (3528 Metric), 1210
Manufacturer size codeB

Product details

What the 1.8 Ohm ESR means for your rail

The TAJB686K004RNJ: At 68 µF and 4 V rated, this TAJ-series tantalum delivers bulk capacitance for decoupling or hold-up on low-voltage rails. The 1.8 Ohm ESR sets the ripple current ceiling — at 100 kHz, the self-heating from ripple current through that ESR limits how much AC current the cap can absorb before the internal temperature rise exceeds the datasheet derating. But if the ripple doubles, the dissipation quadruples — watch the ripple budget.

The molded case and surface-mount 1411 (3528 Metric) footprint keep the board profile low — 2.10 mm seated height — for dense layouts.

Frequently asked questions

What is the datasheet for TAJB686K004RNJ?

Engineers need full specs, dimensions, and ratings to validate fit in a design.

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Is TAJB686K004RNJ obsolete or still active?

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What is the equivalent or replacement for TAJB686K004RNJ?

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Does TAJB686K004RNJ have a specific footprint or package size?

Design engineers and maintenance techs need mechanical compatibility for PCB layout or replacement.

Can TAJB686K004RNJ be used in high-temperature applications?

Buyers evaluating reliability need to confirm the part meets their operating environment.