Datasheet

ManualsBrandsST ManualsDiscrete SemiconductorsPower Transistor, SOT-32, NPN, 80V

June 2009 Doc ID 4189 Rev 3 1/9

BD235

BD237

Low voltage NPN power transistors

Features

■ Low saturation voltage

■ NPN transistors

Applications

■ Audio, power linear and switching applications

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.

Figure 1. Internal schematic diagram

SOT-32

(TO-126)

Table 1. Device summary

Order codes Marking Package Packaging

BD235 BD235 SOT-32 Tube

BD237 BD237 SOT-32 Tube

www.st.com

Summary of content (9 pages)

PAGE 1
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.
PAGE 2
Absolute maximum ratings 1 BD235, BD237 Absolute maximum ratings Table 2.
PAGE 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.
PAGE 4
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.
PAGE 5
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.
PAGE 6
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.
PAGE 7
BD235, BD237 Package mechanical data Doc ID 4189 Rev 3 7/9
PAGE 8
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.
PAGE 9
BD235, BD237 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.