2N4870 2N4871 SILICON PN UNIJUNCTION TRANSISTORS w w w. c e n t r a l s e m i . c o m DESCRIPTION: The CENTRAL SEMICONDUCTOR 2N4870 and 2N4871 are silicon PN unijunction transistors designed for oscillator, triggering and timing applications. MARKING: FULL PART NUMBER TO-92 CASE MAXIMUM RATINGS: (TA=25C) Emitter Reverse Voltage Interbase Voltage SYMBOL VB2E VB2B1 30 UNITS V 35 V Ie ie 1.5 A 1.0 A 300 mW Operating Junction Temperature PD TJ -65 to +125 C Storage Temperature Tstg -65 to +150 C ELECTRICAL CHARACTERISTICS: (TA=25C) SYMBOL TEST CONDITIONS VB2B1=10V 2N4870 MIN MAX 0.56 0.75 2N4871 MIN MAX 0.70 0.85 RBB VB2B1=3.0V 4.0 9.1 4.0 9.1 k IEB2O VB2E=30V - 1.0 - 1.0 A IV VB2B1=20V, RB2=100 VB2B1=25V 2.0 - 4.0 - mA IP - 5.0 - 5.0 A VOB1 V1=20V 3.0 - 5.0 - V RMS Emitter Current Peak Emitter Current (Duty Cycle 1%, PRR=10pps) RMS Power Dissipation UNITS R1 (23-April 2013) 2N4870 2N4871 SILICON PN UNIJUNCTION TRANSISTORS TO-92 CASE - MECHANICAL OUTLINE LEAD CODE: 1) Base 1 2) Emitter 3) Base 2 MARKING: FULL PART NUMBER R1 (23-April 2013) w w w. c e n t r a l s e m i . c o m