LESHAN RADIO COMPANY, LTD. Bias Resistor Transistors NPN Silicon Surface Mount Transistors with Monolithic Bias Resistor Network This new series of digital transistors is designed to replace a single device and its external resistor bias network. The BRT (Bias Resistor Transistor) contains a single transistor with a monolithic bias network consisting of two resistors; a series base resistor and a base–emitter resistor. The BRT eliminates these individual components by integrating them into a single device. The use of a BRT can reduce both system cost and board space. The device is housed in the SOT-23 package which is designed for low power surface mount applications. LMUN2237LT1 CASE 318–08, STYLE 6 SOT– 23 (TO–236AB) • Simplifies Circuit Design • Reduces Board Space • Reduces Component Count PIN 2 BASE (INPUT) ESD Rating – R1 R2 PIN 3 COLLECTOR (OUTPUT) PIN 1 EMITTER (GROUND) MAXIMUM RATINGS (TA = 25°C unless otherwise noted) Symbol Value Unit Collector-Base Voltage VCBO 50 Vdc Collector-Emitter Voltage VCEO 50 Vdc IC 100 mAdc Symbol Max Unit PD 230 (Note 1) 338 (Note 2) 1.8 (Note 1) 2.7 (Note 2) mW Rating Collector Current THERMAL CHARACTERISTICS Characteristic Total Device Dissipation TA = 25°C Derate above 25°C °C/W Thermal Resistance – Junction-to-Ambient RθJA 540 (Note 1) 370 (Note 2) °C/W Thermal Resistance – Junction-to-Lead RθJL 264 (Note 1) 287 (Note 2) °C/W Junction and Storage Temperature Range TJ, Tstg –55 to +150 °C 1. FR–4 @ Minimum Pad 2. FR–4 @ 1.0 x 1.0 inch Pad LMUN2237LT1-1/4 LESHAN RADIO COMPANY, LTD. LMUN2237LT1 DEVICE MARKING AND RESISTOR VALUES Device Package Marking LMUN2237LT1 SOT-23 A8P R1 (K) R2 (K) 47 22 3. New devices. Updated curves to follow in subsequent data sheets. ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) (Continued) Symbol Min Typ Max Unit Collector-Base Cutoff Current (VCB = 40 V, IE = 0) ICBO – – 50 nAdc Collector-Emitter Cutoff Current (VCE = 40 V, IB = 0) ICEO – – 50 nAdc Emitter-Base Cutoff Current (VBE = 6.0 V, IC = 0) IEBO – – 0.13 Characteristic OFF CHARACTERISTICS mAdc Collector-Base Breakdown Voltage (IC = 10 µA, IE = 0) V(BR)CBO 50 – – Vdc Collector-Emitter Breakdown Voltage (Note 4) (IC = 2.0 mA, IB = 0) V(BR)CEO 50 – – Vdc hFE 80 140 – VCE(sat) – – 0.25 Vdc 0.2 Vdc ON CHARACTERISTICS (Note 4) DC Current Gain (VCE = 10 V, IC = 5.0 mA) Collector-Emitter Saturation Voltage (IC = 10 mA, IB = 5 mA) Output Voltage (on) (VCC = 5.0 V, VB = 4.0 V, RL = 1.0 kΩ) VOL Input Resistor R1 Resistor Ratio R1/R2 – 32.9 – 47 2.1 1.7 61.1 kΩ 2.6 4. Pulse Test: Pulse Width < 300 µs, Duty Cycle < 2.0% PD, POWER DISSIPATION (mW) 350 250 200 150 100 50 0 –50 RθJA = 370°C/W 0 50 100 TA, AMBIENT TEMPERATURE (°C) 150 Figure 1. Derating Curve LMUN2237LT1-2/4 LESHAN RADIO COMPANY, LTD. 1000 1 VCE = 10 V IC/IB = 10 75°C hFE, DC CURRENT GAIN VCE(sat), COLLECTOR VOLTAGE (VOLTS) TYPICAL ELECTRICAL CHARACTERISTICS – LMUN2237LT1 TA = –25°C 25°C 75°C 0.1 0.01 0 5 10 20 30 15 25 IC, COLLECTOR CURRENT (mA) 35 10 IC, COLLECTOR CURRENT (mA) 1 Figure 2. V CE(sat) versus IC 2 IC, COLLECTOR CURRENT (mA) 100 1.4 1.2 1 0.8 0.6 f = 1 MHz lE = 0 V TA = 25°C 75°C TA = –25°C 10 25°C 1 0.1 0.01 VO = 5 V 0.001 0 5 10 15 20 25 30 35 40 VR, REVERSE BIAS VOLTAGE (VOLTS) Figure 4. Output Capacitance 45 0 2 4 6 8 10 12 Vin, INPUT VOLTAGE (VOLTS) 14 16 Figure 5. Output Current versus Input Voltage 100 Vin, INPUT VOLTAGE (VOLTS) Cob, CAPACITANCE (pF) 1.6 0.2 0 100 Figure 3. DC Current Gain 1.8 0.4 25°C 10 1 40 TA = –25°C 100 VO = 0.2 V TA = –25°C 25°C 75°C 10 1 0 5 15 25 10 20 30 IC, COLLECTOR CURRENT (mA) 35 40 Figure 6. Input Voltage versus Output Current LMUN2237LT1-3/4 LESHAN RADIO COMPANY, LTD. LMUN2237LT1 SOT-23 NOTES: A 1. DIMENSIONING AND TOLERANCING PER ANSI L Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3 1 V 2 B S DIM G A B C D G H J K L S V C D H K J INCHES MIN MAX 0.1102 0.1197 0.0472 0.0551 0.0350 0.0440 0.0150 0.0200 0.0701 0.0807 0.0005 0.0040 0.0034 0.0070 0.0140 0.0285 0.0350 0.0401 0.0830 0.1039 0.0177 0.0236 MILLIMETERS MIN MAX 2.80 3.04 1.20 1.40 0.89 1.11 0.37 0.50 1.78 2.04 0.013 0.100 0.085 0.177 0.35 0.69 0.89 1.02 2.10 2.64 0.45 0.60 PIN 1. BASE 2. EMITTER 3. COLLECTOR 0.037 0.95 0.037 0.95 0.079 2.0 0.035 0.9 0.031 0.8 inches mm LMUN2237LT1-4/4