BU508AF High voltage NPN power transistor for standard definition CRT display Features State-of-the-art technology: - Diffused collector "Enhanced generation" Stable performances versus operating temperature variation Low base-drive requirement Tight hFE range at operating collector current High ruggedness Fully insulated power package U.L. compliant 3 1 2 ISOWATT218FX Applications Horizontal deflection output for CRT TV Switch mode power supplies for CRT TV Figure 1. Internal schematic diagram Description The BU508AF is manufactured using diffused collector in planar technology adopting new and enhanced high voltage structure for updated performance to the horizontal deflection stage. Table 1. Device summary Order code Marking Package Packaging BU508AF BU508AF ISOWATT218FX Tube August 2007 Rev 2 1/11 www.st.com 11 Content BU508AF Content 1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2/11 BU508AF 1 Electrical ratings Electrical ratings Table 2. Absolute maximum rating Symbol Parameter Value Unit VCES Collector-emitter voltage (VBE = 0) 1500 V VCEO Collector-emitter voltage (IB = 0) 700 V VEBO Collector-base voltage (IC = 0) 9 V Collector current 8 A Collector peak current (tP < 5ms) 15 A Base current 4 A PTOT Total dissipation at Tc = 25C 50 W Vins Insulation withstand voltage (RMS) from all three leads to external heatsink 2500 V Tstg Storage temperature IC ICM IB TJ Table 3. Symbol -65 to 150 C Max. operating junction temperature 150 Thermal data Parameter Rthj-case Thermal resistance junction-case _______________max Value Unit 2.5 C/W 3/11 Electrical characteristics 2 BU508AF Electrical characteristics (Tcase = 25C unless otherwise specified) Table 4. Symbol Electrical characteristics Parameter ICES Collector cut-off current (VBE =0) IEBO Emitter cut-off current (IC =0) Collector-emitter VCEO(sus) (1) sustaining voltage (IC =0) Test conditions VCE = 1500V; VEB = 9V IC = 100mA IB = 1.6A VBE(sat) (1) Base-emitter saturation voltage IC = 4.5A IB = 2A IC = 0.1A VCE = 5V IC = 4.5A VCE = 5V IC = 4.5A IB(on) = 0.5A tf Inductive load Storage time Fall time VBE(off) = -2.7V fh = 16KHz LBB(off) = 4.5H 1. Pulsed: Pulse duration = 300 ms, duty cycle 1.5 % Max. Unit 0.2 2 mA mA 1 mA 700 IC = 4.5A ts 4/11 TC= 125C Collector-emitter saturation voltage DC current gain Typ. VCE = 1500V VCE(sat) (1) hFE (1) Min. V 10 5 1 V 1.1 V 30 2.5 0.2 s s BU508AF 2.1 Electrical characteristics Electrical characteristics (curves) Figure 2. Safe operating area Figure 3. Derating curve Figure 4. DC current gain Figure 5. DC current gain Figure 6. Collector-emitter saturation voltage Figure 7. Base-emitter saturation voltage 5/11 Electrical characteristics Figure 8. 6/11 Output characteristics BU508AF BU508AF 2.2 Electrical characteristics Test circuits Figure 9. Power losses and inductive load switching Figure 10. Reverse biased safe operating area 7/11 Package mechanical data 3 BU508AF Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 8/11 BU508AF Package mechanical data ISOWATT218FX mechanical data Dim. Min. mm. Typ Max. A 5.30 5.70 C 2.80 3.20 D 3.10 3.50 D1 1.80 2.20 E 0.80 1.10 F 0.65 0.95 F2 1.80 2.20 G 10.30 11.50 G1 5.45 H 15.30 15.70 L 9 10.20 L2 22.80 23.20 L3 26.30 26.70 L4 43.20 44.40 L5 4.30 4.70 L6 24.30 24.70 L7 14.60 15 N 1.80 2.20 R 3.80 4.20 Dia 3.40 3.80 7627132 B 9/11 Revision history 4 BU508AF Revision history Table 5. 10/11 Document revision history Date Revision Changes 02-Mar-2007 1 Initial release 14-Aug-2007 2 Complete document, added all curves (2.1: Electrical characteristics (curves) BU508AF Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. 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