2N4851 2N4852 2N4853 PN SILICON UNIJUNCTION TRANSISTOR w w w. c e n t r a l s e m i . c o m DESCRIPTION: The CENTRAL SEMICONDUCTOR 2N4851, 2N4852, and 2N4853 are Silicon PN Unijunction Transistors designed for timing, sensing, and trigger circuits. MARKING: FULL PART NUMBER TO-18 (UJT) CASE MAXIMUM RATINGS: (TA=25°C) Emitter Reverse Voltage Interbase Voltage RMS Emitter Current Peak Emitter Current (Duty Cycle ≤1%, PRR≤10pps) SYMBOL VB2E VB2B1 Ie 30 UNITS V 35 V 50 mA 1.5 A 300 mW Operating Junction Temperature ie PD TJ -65 to +125 °C Storage Temperature Tstg -65 to +200 °C MAX 0.75 UNITS RMS Power Dissipation ELECTRICAL CHARACTERISTICS: (TA=25°C unless otherwise noted) SYMBOL TEST CONDITIONS MIN VB2B1=10V (2N4851) 0.56 VB2B1=10V (2N4852, 2N4853) 0.70 VB2B1=3.0V VB2E=30V (2N4851, 2N4852) 4.7 IEB2O IEB2O VB2E=30V (2N4853) IV IV VB2B1=20V, RB2=100Ω (2N4851) VB2B1=20V, RB2=100Ω (2N4852) VB2B1=20V, RB2=100Ω (2N4853) IP VB2B1=25V (2N4851, 2N4852) 2.0 μA IP 0.4 μA VOB1 VB2B1=25V (2N4853) V1=20V (2N4851) 3.0 V VOB1 V1=20V (2N4852) 5.0 V VOB1 V1=20V (2N4853) 6.0 V RBB IV 0.85 9.1 kΩ 100 nA 50 nA 2.0 mA 4.0 mA 6.0 mA R2 (13-December 2010) 2N4851 2N4852 2N4853 PN SILICON UNIJUNCTION TRANSISTOR TO-18 (UJT) CASE - MECHANICAL OUTLINE LEAD CODE: 1) Emitter 2) Base 1 3) Base 2 MARKING: FULL PART NUMBER R2 (13-December 2010) w w w. c e n t r a l s e m i . c o m