The TAJC685K035H is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 6.8 µF capacitance with ±10% tolerance and a 35 V DC voltage rating. That 35 V rating gives 1.4× derating on a 24 V rail — enough margin for most industrial supplies without oversizing the case. The 2312 (6032 Metric) case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm max. That footprint matches the standard C-size tantalum pad layout — if your board already has a C-size footprint, this part drops in without a layout change.
ESR and temperature range — the bench-level details
ESR is 1.8 Ohm — typical for a 6.8 µF / 35 V tantalum in this case size. For a bulk decoupling cap on a 24 V rail drawing 200 mA, you have headroom. That means it survives cold-soak on an outdoor base station and still holds capacitance within spec when the enclosure hits 85°C on a summer afternoon.