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BD235 BD237
NPN power transistors
Features
.
NPN transistors
Applications
Audio, power linear and switching application
3 2 1
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 types are BD236 and BD238 respectively. SOT-32 (TO-126) Figure 1.
Internal schematic diagram
Table 1.
Device summary
Marking BD235 BD237 Package SOT-32 SOT-32 Packaging Tube Tube
Order code BD235 BD237
July 2007
Rev 2
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Absolute maximum ratings
BD235 BD237
1
Absolute maximum ratings
Table 2.
Symbol
Absolute maximum ratings
Parameter Value BD235 BD237 100 100 80 5 2 6 25 -65 to 150 150 V V V V A A W C C Unit
VCBO VCER VCEO VEBO IC ICM PTOT Tstg TJ
Collector-base voltage (IE = 0) Collector-emitter voltage (RBE = 1K) Collector-emitter voltage (IB = 0) Emitter-base voltage (IC = 0) Collector current Collector peak current (tp < ms) Total dissipation at Tcase = 25C Storage temperature Max. operating junction temperature
60 60 60
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BD235 BD237
Electrical characteristics
2
Electrical characteristics
(Tcase = 25C; unless otherwise specified) Table 3.
Symbol ICBO IEBO
Electrical characteristics
Parameter Collector cut-off current (IE = 0) Emitter cut-off current (IC = 0) Test Conditions VCB = rated VCBO VCB = rated VCBO TC= 150C VEB = 5V IC = 100mA for BD235 for BD237 IC = 1A __ IC = 1A ___ IB = 0.1A V CE = 2V 40 25 Min. Typ. Max. 0.1 2 1 Unit mA mA mA
Collector-emitter VCEO(sus)(1) sustaining voltage (IB = 0) VCE(sat)(1) VBE(1) hFE(1) Collector-emitter saturation voltage Base-emitter voltage DC current gain
60 80 0.6 1.3
V V V V
IC = 150mA _ VCE = 2V VCE = 2V IC = 1A_
1. Pulsed duration = 300 ms, duty cycle 1.5%.
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Electrical characteristics
BD235 BD237
2.1
Electrical characteristic (curves)
Figure 2. Safe operating area Figure 3. Derating curves
Figure 4.
DC current gain
Figure 5.
DC current gain
Figure 6.
Collector-emitter saturation voltage
Figure 7.
Base-emitter saturation voltage
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BD235 BD237 Figure 8. Base-emitter on voltage Figure 9.
Electrical characteristics Resistive load switching time
Figure 10.
Resistive load switching time Figure 11. Capacitance curves
2.2
Test circuit
Figure 12. Resistive load switching test circuit
1) Fast electronic switch 2) Non-inductive resistor
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Package mechanical data
BD235 BD237
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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BD235 BD237
Package mechanical data
SOT-32 (TO-126) mechanical data
DIM. A B B1 D E e e1 L P Q Q1 H2 I 1 2.15 1.27 mm. MIN. 2.4 0.64 0.39 10.5 7.4 2.04 4.07 15.3 2.9 3.8 1.52 2.29 4.58 TYP MAX. 2.9 0.88 0.63 11.05 7.8 2.54 5.08 16 3.2
0016114E
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Revision history
BD235 BD237
4
Table 4.
Revision history
Revision history
Revision 1 2 Initial Release Figures: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and figure 12 have been added. Changes
Date 11-Feb-2003 09-Jul-2007
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BD235 BD237
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