Datasheet

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DB3 DB4 SMDB3

October 2001 - Ed: 2B

DIAC

DO-35

(DB3 and DB4)

■

: 32V and 40V

■

LOW BREAKOVER CURRENT

FEATURES

Functioning as a trigger diode with a fixed voltage

reference, the DB3/DB4 series can be used in

conjunction with triacs for simplified gate control

circuits or as a starting element in fluorenscent

lamp ballasts.

A new surface mount version is now available in

SOT-23 package, providing reduced space and

compatibility with automatic pick and place

equipment.

DESCRIPTION

Symbol Parameter Value Unit

TRM

Repetitive peak on-state current

tp=20µs F= 120 Hz

SMDB3

1.00 A

DB3 / DB4

2.00

Tstg

Storage temperature range

Operating junction temperature range

-40to+125 °C

ABSOLUTE MAXIMUM RATINGS (limiting values)

SOT-23

(SMDB3)*

Pin 1 and 3 must be shorted

together

Note: * SMDB3 indicated as Preliminary spec as product is still in development stage.

Summary of content (5 pages)

PAGE 1
DB3 DB4 SMDB3 ® DIAC FEATURES ■ ■ VBO : 32V and 40V LOW BREAKOVER CURRENT DO-35 (DB3 and DB4) DESCRIPTION Functioning as a trigger diode with a fixed voltage reference, the DB3/DB4 series can be used in conjunction with triacs for simplified gate control circuits or as a starting element in fluorenscent lamp ballasts. A new surface mount version is now available in SOT-23 package, providing reduced space and compatibility with automatic pick and place equipment.
PAGE 2
DB3 DB4 SMDB3 ELECTRICAL CHARACTERISTICS (Tj = 25°C unless otherwise specified) Symbol Parameter Test Conditions VBO Breakover voltage * C = 22nF ** SMDB3 DB3 DB4 Unit MIN. 28 28 35 V TYP. 32 32 40 MAX. 36 36 45 I VBO1 - VBO2 I Breakover voltage symmetry C = 22nF ** MAX. ∆V Dynamic breakover voltage * VBO and VF at 10mA MIN. 10 5 V VO Output voltage * see diagram 2 (R=20Ω) MIN. 10 5 V IBO Breakover current * C = 22nF ** MAX. 10 50 µA see diagram 3 MAX. 0.
PAGE 3
DB3 DB4 SMDB3 OTHER INFORMATION Part Number Marking Weight Base Quantity Packing Mode SMDB3 DB3 0.01 g 3000 Tape & Reel DB3 DB3 (Blue Body Coat) 0.15 g 5000 Tape & Reel DB4 DB4 (Blue Body Coat) 0.15 g 5000 Tape & Reel Diagram 1: Voltage - current characteristic curve. Diagram 2: Test circuit. 10 kΩ 220 V + IF 500 kΩ D.U.T Rs=0 I C=0.1µF 50 Hz P Vo 10mA T410 R=20 Ω -V IBO IB + V Diagram 3: Rise time measurement.
PAGE 4
DB3 DB4 SMDB3 Fig. 1: Relative variation of VBO versus junction temperature (typical values). Fig. 2: Repetitive peak pulse current versus pulse duration (maximum values). ITRM(A) VBO [Tj] / VBO [Tj=25°C] 20.0 1.10 1.05 F=120Hz Tj initial=25°C 10.0 DB3/DB4 DB3/DB4 1.00 0.95 SMDB3 1.0 SMDB3 0.90 0.85 tp(µs) Tj(°C) 0.80 25 50 75 100 125 0.1 1 10 100 Fig. 3: Time duration while current pulse is higher 50mA versus C and Rs (typical values).
PAGE 5
DB3 DB4 SMDB3 PACKAGE MECHANICAL DATA (in millimeters) SOT-23 REF. A E DIMENSIONS Millimeters e D e1 B S Inches Min. Max. Min. Max. A 0.89 1.4 0.035 0.055 A1 0 0.1 0 0.004 B 0.3 0.51 0.012 0.02 c 0.085 0.18 0.003 0.007 D 2.75 3.04 0.108 0.12 e 0.85 1.05 0.033 0.041 e1 1.7 2.1 0.067 0.083 E 1.2 1.6 0.047 0.063 H 2.1 2.75 0.083 0.108 A1 L H L 0.6 typ. 0.024 typ. c S 0.35 0.65 0.014 0.026 FOOTPRINT 0.9 0.035 1.1 0.043 0.9 0.035 2.35 0.