BD235 BD237 Low voltage NPN power transistors Features ■ Low saturation voltage ■ NPN transistors Applications ■ Audio, power linear and switching applications 3 1 SOT-32 (TO-126) Description The devices are manufactured in Planar technology with “Base Island” layout. The resulting transistor shows exceptional high gain performance coupled with very low saturation voltage. The PNP type is BD238. Table 1. 2 Figure 1. Internal schematic diagram Device summary Order codes Marking Package Packaging BD235 BD235 SOT-32 Tube BD237 BD237 SOT-32 Tube June 2009 Doc ID 4189 Rev 3 1/9 www.st.com 9 Absolute maximum ratings 1 BD235, BD237 Absolute maximum ratings Table 2. Absolute maximum ratings Value Symbol Unit BD235 BD237 VCBO Collector-base voltage (IE = 0) 60 100 V VCER Collector-emitter voltage (RBE = 1 kΩ) 60 100 V VCEO Collector-emitter voltage (IB = 0) 60 80 V VEBO Emitter-base voltage (IC = 0) 5 V Collector current 2 A ICM Collector peak current (tp < ms) 6 A PTOT Total dissipation at Tcase = 25°C 25 W Tstg Storage temperature -65 to 150 °C 150 °C IC TJ 2/9 Parameter Max. operating junction temperature Doc ID 4189 Rev 3 BD235, BD237 2 Electrical characteristics Electrical characteristics (Tcase = 25°C; unless otherwise specified) Table 3. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit 0.1 mA 2 mA 1 mA Collector cut-off current VCB = rated VCBO (IE = 0) VCB = rated VCBO TC= 150°C Emitter cut-off current (IC = 0) VEB = 5V Collector-emitter sustaining voltage (IB = 0) IC = 100mA for BD235 for BD237 VCE(sat)(1) Collector-emitter saturation voltage IC = 1A __ IB = 0.1A - 0.6 V VBE(on)(1) Base-emitter on voltage IC = 1A ___ VCE = 2V - 1.3 V IC = 150mA _ VCE = 2V 40 IC = 1A_ VCE = 2V 25 ICBO IEBO VCEO(sus) (1) hFE(1) DC current gain - - 60 80 - V V - 1. Pulsed duration = 300 µs, duty cycle = 1.5 %. 2.1 Electrical characteristic (curves) Figure 2. Safe operating area Figure 3. Doc ID 4189 Rev 3 Derating curves 3/9 Electrical characteristics 4/9 BD235, BD237 Figure 4. DC current gain (VCE = 2 V) Figure 5. DC current gain (VCE = 4 V) Figure 6. Collector-emitter saturation voltage Figure 7. Base-emitter saturation voltage Figure 8. Base-emitter on voltage Figure 9. Resistive load switching time (on) Doc ID 4189 Rev 3 BD235, BD237 Electrical characteristics Figure 10. Resistive load switching time (off) 2.2 Test circuit Figure 11. Resistive load switching test circuit 1. Fast electronic switch 2. Non-inductive resistor Doc ID 4189 Rev 3 5/9 Package mechanical data 3 BD235, BD237 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 6/9 Doc ID 4189 Rev 3 BD235, BD237 Package mechanical data Doc ID 4189 Rev 3 7/9 Revision history BD235, BD237 4 Revision history Table 4. 8/9 Document revision history Date Revision Changes 11-Feb-2003 1 Initial release. 09-Jul-2007 2 Added: figures 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. 03-Jun-2009 3 Minor text changes. Doc ID 4189 Rev 3 BD235, BD237 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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