BD235 - STMicroelectronics

July 2007 Rev 2 1/9

BD235

BD237

NPN power transistors

Features

■NPN transistors

Applications

■Audio, power linear and switching application

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.

Figure 1. Internal schematic diagram

SOT-32

321

(TO-126)

www.st.com

Table 1. Device summary

Order code Marking Package Packaging

BD235

BD237

BD235

BD237

SOT-32

Tube

Absolute maximum ratings BD235 BD237

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1 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

BD235 BD237

VCBO Collector-base voltage (IE = 0) 60 100 V

VCER Collector-emitter voltage (RBE = 1KΩ) 60 100 V

VCEO Collector-emitter voltage (IB = 0) 60 80 V

VEBO Emitter-base voltage (IC = 0) 5 V

ICCollector 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

TJMax. operating junction temperature 150 °C

BD235 BD237 Electrical characteristics

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2 Electrical characteristics

(Tcase = 25°C; unless otherwise specified)

Table 3. Electrical characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

ICBO

Collector cut-off current

(IE = 0)

VCB = rated VCBO

VCB = rated VCBO TC= 150°C

0.1

IEBO

Emitter cut-off current

(IC = 0) VEB = 5V 1mA

VCEO(sus)(1)

1. Pulsed duration = 300 ms, duty cycle ≥1.5%.

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(1) Base-emitter voltage IC = 1A ___ VCE = 2V 1.3 V

hFE(1) DC current gain IC = 150mA _ VCE = 2V

IC = 1A_ VCE = 2V

Electrical characteristics BD235 BD237

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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

BD235 BD237 Electrical characteristics

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2.2 Test circuit

Figure 12. Resistive load switching test circuit

Figure 8. Base-emitter on voltage

Figure 9. Resistive load switching time

Figure 10. Resistive load switching time Figure 11. Capacitance curves

1) Fast electronic switch

2) Non-inductive resistor

Package mechanical data BD235 BD237

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3 Package mechanical data

In order to meet environmental requirements, ST offers these devices in

ECOPACK® 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

BD235 BD237 Package mechanical data

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DIM. mm.

MIN. TYP MAX.

A2.4 2.9

B 0.64 0.88

B1 0.39 0.63

D10.5 11.05

E7.4 7.8

e 2.04 2.29 2.54

e1 4.07 4.58 5.08

L15.3 16

P2.9 3.2

Q3.8

Q1 1 1.52

H2 2.15

I1.27

SOT-32 (TO-126) mechanical data

0016114E

Revision history BD235 BD237

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4 Revision history

Table 4. Revision history

Date Revision Changes

11-Feb-2003 1 Initial Release

09-Jul-2007 2 Figures: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and figure 12 have been added.

BD235 BD237

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