The 13PD150-ST, an InGaAs photodiode with a 150mm-diameter photosensitive region packaged in a TO-46 header and aligned in an AT&T ST active device mount, is intended for high coupling efficiency to multi-mode fiber in moderate-to-high speed applications. Planar semiconductor design and dielectric passivation provide low noise performance. Reliability is assured by hermetic sealing and a 100% purge burn-in ( 200oC, 15 hours, Vr = 20V ). The ST receptacle is suitable for bulkhead and PC board mounting.