UNUUNCTIONS CONVENTIONAL General Electric produces a very broad line of standard UJTs. The TO-5 ceramic disc bar structure device has been the workhorse of the unijunction industry for over 10 years. MIL versions are available on the 2N489-494 series. Equivalent types are available in TO-18 packages where small size is required. The cube structure TO-18 series offers excellent value for those requiring proved, low cost units. Applications Oscillators SCR Triggers Timers Frequency Divider Sawtooth Generators Stable Voltage Sensing Raso Ip leo Vou: Interbase n lv Peak Point Emitter Base One Resistance Intrinsic Valley Emitter Reverse Current Peak Pulse Specifi- @ Var = 3V Standoff Current Current r_- Voltage Package cation GE ft = 0 Ratio Min. Max. Max. Ti= 25C Min. Comments Outline Sheet Type (Ki) @ Vex == 10V = (mA) (uA) (uA) @ Vex (V} No. No. 2N489 ee ne 2 : _ : : ae 2N4894 * 6.8. .51-,62 12 3 2N489B 6 3 2N490 o 12 490A* - oe 12 3 2N490B 51-620 8 6 3 2N490C : 2 3 2N491 me 12 _ 2N491A * .56-.68 12 3 w _ 2N491B 6 3 = = -2Na92 12 BS 2N492A* og 56-.68 12 3 & wasp 56-. 6 3 2 -2N4920 2 3 Co - -2N493 oe Bene 12 = a >. 2N493A * HeT~ BB .62-.75 a 12 3 31 60.10 S 2N493B - ae ee 6 3 a 2naa4 : 12 2N494A * 12 3 2N494B 62-.75 6 3 2N494 2 3 QNIG71 os oe 25 coos 2N16710 4 . 5 7 oNeaiB Ad 9.1 : 47-62 SAB 23 3 31 60:50 2N1671 Tes 2 3 ae 2N2160 0 AOEZO 47-800 BO. 25 3 31 60.53 2N2417 ka = 12 ee QN2417A 4. Te By .51-.62 S 12 } QN27B oh 6 3 % 10 | 2N2418 5 62 . ae 12 _ : QN2418N .- 6292. 51-62 2 8 12 | 2N24188 Es es 6 3 30 80.10 eH . 8 3 2 9A .56-.68 12 5 B _2n24198 2 30 60.10 = 2N2420 12 : 2N24204 .56-.68 12 3 3 gig ai 5 2N24203 6 3 0 S010 = aNeaatA ao use 12 T 421A .62-.75 ar 1 ei SO = 224218 . a 3 30 $0.40 2N2422 12 2N2422A .62-.75 10 2N24228 2 3 30 60.10 p5G514 25 D5G515 25 DSG516 47-62 6 3 30 = ~ ee 2 3 SS 2N2646 56.750 5 3 29 60.62 Sy 2N2647 .68-.82 = 2 6 az 3S 2 29 60.62 = S DS5E-43 a -68-.82 2 5 29 * 60,42 2 pse-aa 1 68.820 4 29 60.13 2N2840 814 .62 Typical Qe 10 29 60.56 2 yan & JANTX types available See selector guideUnijunctions, Triggers, Switches page 33. 34