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 BU508AF
High voltage NPN Power transistor for standard Definition CRT display
Preliminary Data
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 In compliance with the 2002/93/EC European directive
1 2 3
ISOWATT218FX
Applications

Internal schematic diagram
Horizontal deflection output for CRT TV Switch mode power supplies for CRT TV
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.
Order codes
Part Number BU508AF Marking BU508AF Package ISOWATT218FX Packaging Tube
March 2007
Rev 1
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www.st.com 8
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
Electrical ratings
BU508AF
1
Electrical ratings
Table 1.
Symbol VCES VCEO VEBO IC ICM IB PTOT Vins Tstg TJ
Absolute maximum rating
Parameter Collector-emitter voltage (VBE = 0) Collector-emitter voltage (IB = 0) Collector-base voltage (IC = 0) Collector current Collector peak current (tP < 5ms) Base current Total dissipation at Tc = 25C Insulation withstand voltage (RMS) from all three leads to external heatsink Storage temperature Max. operating junction temperature Value 1500 700 9 8 15 4 50 2500 -65 to 150 C 150 Unit V V V A A A W V
Table 2.
Symbol
Thermal data
Parameter Value 2.5 Unit C/W
Rthj-case Thermal resistance junction-case _______________max
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BU508AF
Electrical characteristics
2
Electrical characteristics
(Tcase = 25C unless otherwise specified) Table 3.
Symbol ICES IEBO
Electrical characteristics
Parameter Collector cut-off current (VBE =0) Emitter cut-off current (IC =0) Test conditions VCE = 1500V VCE = 1500V; VEB = 9V TC= 125C Min. Typ. Max. 0.2 2 1 Unit mA mA mA
Collector-emitter VCEO(sus) (1) sustaining voltage (IC =0) VCE(sat) (1) VBE(sat) (1) hFE (1) Collector-emitter saturation voltage Base-emitter saturation voltage DC current gain Inductive load Storage time Fall time
IC = 100mA
700
V
IC = 4.5A IC = 4.5A IC = 0.1A IC = 4.5A IC = 4.5A
IB = 1.6A IB = 2A VCE = 5V VCE = 5V IB(on) = 0.5A 2.5 0.2 10 5
1 1.1 30
V V
ts tf
VBE(off) = -2.7V fh = 16KHz LBB(off) = 4.5H
s s
1. Pulsed: Pulse duration = 300 ms, duty cycle 1.5 %
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Electrical characteristics
BU508AF
2.1
Test circuits
Figure 1. Power losses and inductive load switching
Figure 2.
Reverse biased safe operating area
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BU508AF
Package mechanical data
3
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
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Package mechanical data
BU508AF
ISOWATT218FX MECHANICAL DATA
DIM. A C D D1 E F F2 G G1 H L L2 L3 L4 L5 L6 L7 N R Dia
MIN. 5.30 2.80 3.10 1.80 0.80 0.65 1.80 10.30 15.30 9 22.80 26.30 43.20 4.30 24.30 14.60 1.80 3.80 3.40
mm. TYP
MAX. 5.70 3.20 3.50 2.20 1.10 0.95 2.20 11.50 15.70 10.20 23.20 26.70 44.40 4.70 24.70 15 2.20 4.20 3.80
5.45
7627132 B
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BU508AF
Revision history
4
Revision history
Table 4.
Date 02-Mar-2007
Revision history
Revision 1 Initial release. Changes
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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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
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