The 600 mΩ ESR sets the ripple-current ceiling — at 50 V the part can handle moderate ripple without excessive self-heating, but a higher-ripple bus (e.g., a switching regulator output) may need a lower-ESR polymer or multiple paralleled parts.
Military temperature range — where it runs
The 2924 (7361 Metric) case — 7.30 x 6.10 mm — provides enough anode surface to hold the 50 V rating without the voltage-derating penalty that smaller-case tantalums require at high temperature.
