urigger Devices UJT Ox) UNIJUNCTION TRANSISTORS UJT Highly stable devices for general-purpose trigger applica- tions and as pulse generators (oscillators) and timing circuits. Useful at frequencies ranging (generally) from 1 Hz to 1 MHz. Available in low-cost plastic package TO-226AA (TO-92) nes PROGRAMMABLE UNIJUNCTION TRANSISTORS UT Similar to UJTs, except that ly, dp and intrinsic standoff voltage are programmable (adjustable) by means of external voltage divider. This stabilizes circuit performance for variations in device parameters. General ope- rating frequency range is from 0.01 Hz to 10 kHz, making them suitable for long-duration timer circuits. Two-package availabi- lity provides cost option. ... Wide Range of Sensitivities ... Input Characteristics for Most Applications ... Industry Standards, with a variety of Custom Specifications available. QO @ SBS } SILICON BIDIRECTIONAL SWITCH SBS Applications similar to DIAC, but has gate electrode that permits synchronization. UNIJUNCTION TRANSISTORS (UJT) Pack Device IP 'EB20 lv ackage Type Min Max uA Max LA Max mA Min Plastic 2N4870 0.56 0.75 5.0 1.0 2.0 Case 29-02 2N4871 0.70 | 0.85 5.0 1.0 4.0 TO-226AA MU4891 0.55 0.82 5.0 0.01 2.0 (TO-92) MU4892 0.51 0.69 2.0 0.01 2.0 MU4893 0.55 0.82 2.0 0.01 2.0 MU4894 0.74 0.86 1.0 0.01 2.0 Metal 2N2646 0.56 0.75 5.0 12 4.0 Case 22A-01 2N2647 0.68 0.82 2.0 0.2 8.0 TO-220AB . (TO-18) PROGRAMMABLE UNIJUNCTION TRANSISTORS (PUT) Ip ly Re= | RG= IGAo Re= | Re= 10kQ | 1.0 MQ 40 V | 10 kQ | 1.0 MQ Device Package Type uA Max nA Max | vA Min | uA Max . . 2N6027 | 5.0 | 2.0 10 70 50 Plastic A = Case 29-02 G = 2N6028 1.0 0.15 10 25 25 TO-226AA k (TO-92) SILICON BIDIRECTIONAL SWITCH (SBS) Vs Voits Device Ig Ix Package Type Min Max uA Max mA Max Plastic Case 29-02 MBS4991 6.0 10 500 1.5 TO-2264A MBS4992 7.56 9.0 120 0.5 (TO-92) MOTOROLA EUROPEAN MASTER SELECTION GUIDE 3-101