1N5221B-1 thru 1N5281B-1 Available on commercial .
1N5276B - SILICON PLANAR ZENER DIODES
1N5276B - Zener Diodes
1N5276B - SILICON ZENER DIODES
1N5276BUR-1 - METALLURGICALLY BONDED GLASS SURFACE MOUNT 500mW ZENERS
1N5276B-1 - ZENER DIODES