BC237B General Purpose Transistor NPN Description: • General purpose NPN silicon planar epitaxial transistors, best suited for use in driver stages of audio amplifiers, low noise input stages of tape recorders. Hi-Fi amplifiers, signal processing circuits of television receivers. TO-92 Plastic Package Dimensions Minimum Maximum A 4.32 5.33 B 4.45 5.20 C 3.18 4.19 D 0.41 0.55 E 0.35 0.50 F 5° G 1.14 1.40 H 1.14 1.53 K 12.70 - L 1.982 2.082 Dimensions : Millimetres Pin Configuration: 1. Emitter 2. Base 3. Collector Page 1 10/05/08 V1.1 BC237B General Purpose Transistor NPN Parameter Symbol BC237B Collector-Emitter Voltage VCEO 45 Collector-Emitter Voltage VCES 50 Emitter-Base Voltage VEBO 6 IC 100 mA 350 2.8 mW mW/°C 1 8 W mW/°C Tj, Tstg -55 to + 150 °C Junction to Ambient Rth (j-a) 375 Junction to Case Rth (j-c) 125 Collector Current Continuous Power Dissipation at Ta = 25°C Derate Above 25°C PD Power Dissipation at Tc = 25°C Derate Above 25°C Operating and Storage Junction Temperature Range Units V Thermal Resistance ºC/W Electrical Characteristics (Ta = 25°C unless specified otherwise) Parameter Symbol Test Condition Minimum Typical Maximum Units Collector Emitter Voltage VCEO IC = 2mA, IB = 0 45 - - Emitter Base Voltage VEBO IE = 100µA, IC = 0 6 - - Collector Cut off Current ICES VCE = 50V, VBE = 0 VCE = 50V, VBE = 0, Ta = 125°C - - 15 4 nA µA DC Current Gain hFE IC = 2mA, VCE = 50V 200 290 460 - Collector Emitter Saturation Voltage VCE (sat) IC = 10mA, IB = 0.5mA IC = 100mA, IB = 5mA* - 0.07 0.2 0.2 0.6 Base Emitter Saturation Voltage VBE (sat) IC= 10mA, IB = 0.5mA IC= 100mA, IB = 0.5mA* - 0.6 0.83 1.05 VBE (on) IC = 100µA, VCE = 5V IC = 2mA, VCE = 5V IC = 100mA, VCE = 5V* fT IC = 0.5mA, VCE = 3V f = 100MHz IC = 10mA, VCE = 5V f = 100MHz V Base Emitter On Voltage 0.55 0.5 0.62 0.83 V 0.7 Dynamic Characteristics Transition Frequency Collector Output Capacitance Cob VCB = 10V, IE = 0 f = 1MHz - 100 150 200 - - - MHz 4.50 pF *Pulse Condition: Pulse Width 300µs, Duty Cycle 2%. Page 2 10/05/08 V1.1 BC237B General Purpose Transistor NPN Electrical Characteristics Continued (Ta = 25°C unless specified otherwise) Parameter Symbol Test Condition Minimum Typical Emitter Input Capacitance Cib VEB = 0.5V, IE = 0 f = 1MHz - 8.0 Noise Figure NF VCE = 5V, IC = 2mA Rs = 2.0kW, f = 1KHz F = 200Hz - 2 Maximum Units Dynamic Characteristics pF 10 dB Specifications VCEO (V) VCBO Maximum (V) IC (A) 45 50 0.1 hFE Minimum at IC = 2mA fT Minimum (MHz) Ptot (mW) Package Part Number 200 200 350 TO-92 BC237B Page 3 10/05/08 V1.1 BC237B General Purpose Transistor NPN Notes: International Sales Offices: AUSTRALIA – Farnell FINLAND – Farnell ITALY – Farnell SPAIN – Farnell Tel No: Tel No: Tel No: Tel No: ++61 1300 361 005 ++ 358 9 560 7780 ++ 39 02 93 995 200 901 20 20 80 Fax No: ++61 1300 361 225 Fax No: ++ 358 9 345 5411 Fax No: ++ 39 02 93 995 300 Fax No: 901 20 20 90 AUSTRIA – Farnell FRANCE – Farnell SWEDEN – Farnell Tel No: Tel No: Fax No: ++ 43 662 2180 670 Fax No: ++ 33 474 68 99 90 MALAYSIA – Farnell-Newark Tel No: ++ 60 3 7873 8000 Fax No: ++ 60 3 7873 7000 BELGIUM – Farnell GERMANY – Farnell NETHERLANDS – Farnell SWITZERLAND – Farnell Tel No: Tel No: Tel No: ++ 43 662 2180 680 ++ 33 474 68 99 99 Tel No: ++ 46 8 730 50 00 Fax No: ++ 46 8 83 52 62 Fax No: ++ 32 3 227 3648 Fax No: ++ 49 89 613 59 01 Fax No: ++ 31 30 241 7333 Tel No: ++ 44 204 64 64 Fax No: ++ 44 204 64 54 BRAZIL – Farnell-Newark HONG KONG – NEW ZEALAND – Farnell UK – Farnell Tel No: Tel No: ++ 32 3 475 2810 ++ 49 89 61 39 39 39 ++ 31 30 241 7373 ++ 55 11 4066 9400 Farnell-Newark Tel No: ++ 852 2268 9888 Fax No: ++ 55 11 4066 9410 Fax No: ++ 852 2268 9899 Fax No: 0800 90 80 81 Fax No: ++ 44 8701 200 201 CHINA – Farnell-Newark HUNGARY - Farnell NORWAY – Farnell UK – CPC Tel No: Tel No: Tel No: 800 146 70 ++ 44 8701 202 530 Tel No: ++86 10 6238 5152 ++ 44 870 1200 208 0800 90 80 80 ++ 44 8701 200 200 Fax No: ++86 10 6238 5022 Fax No: ++ 44 870 1200 209 Fax No: 800 146 76 ++ 44 8701 202 531 CZECH REPUBLIC - Farnell INDIA - Farnell PORTUGAL – Farnell USA – Tel No: Tel No: Tel No: ++ 44 870 1200 208 ++ 44 870 1200 208 Fax No: ++ 44 870 1200 209 Fax No: ++ 44 870 1200 209 Fax No: ++ 34 93 474 5288 DENMARK – Farnell IRELAND – Farnell RUSSIA – Farnell Tel No: Tel No: Tel No: ++ 45 44 53 66 44 Fax No: ++ 45 44 53 66 06 ++ 353 1 830 9277 ++ 44 870 1200 208 Fax No: ++ 44 870 1200 209 Fax No: ++ 353 1 830 9016 Newark ++ 34 93 475 8804 Tel No: export 800 463 9275 EXPORT – Farnell Tel No: ++ 44 8701 200 208 Fax No: ++ 44 8701 200 209 For enquiries from all other markets ESTONIA – Farnell ISRAEL – Farnell Tel No: Tel No: ++ 358 9 560 7780 Fax No: ++ 358 9 345 5411 SINGAPORE – Farnell-Newark Tel No: ++ 65 6788 0200 ++ 180 937 0015 Fax No: ++ 180 937 0014 Fax No: ++ 65 6788 0300 http://www.farnell.com http://www.newark.com http://www.cpc.co.uk Disclaimer This data sheet and its contents (the "Information") belong to the Premier Farnell Group (the "Group") or are licensed to it. 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