Sensitive SCRs E5 - Futurlec

Sensitive SCRsData Sheets12Average On-statePower Dissipation [P D(AV) ] – Watts108642CURRENT WAVEFORM: Half Sine WaveLOAD: Resistive or InductiveCONDUCTION ANGLE: 180˚6 A to 10 ATO-220, TO-202,TO-251, and TO-252+6 V DC–ResetNormally-closedPushbuttonV1D.U.T.1001 k(1%)I GTIN4001I GV GT100R100 2 4 6 8 10RMS On-state Current [I T(RMS) ] – AmpsFigure E5.17 Power Dissipation (Typical) versus RMS On-state CurrentI LI L (T C = 25 ˚C)Ratio of9.08.07.06.05.04.03.02.01.0See General Notes for specific deviceoperating temperature range.0-65 -40 -15 +25 +65 +110 +125Case Temperature (T C ) – ˚CFigure E5.18 Normalized DC Latching Current versus Case TemperatureFigure E5.19 Simple Test Circuit for Gate Trigger Voltage andCurrent MeasurementNote: V1 — 0 V to 10 V dc meterV GT — 0 V to 1 V dc meterI G — 0 mA to 1 mA dc milliammeterR1 — 1 k potentiometerTo measure gate trigger voltage and current, raise gate voltage(V GT ) until meter reading V1 drops from 6 V to 1 V. Gate triggervoltage is the reading on V GT just prior to V1 dropping. Gate triggercurrent I GT can be computed from the relationshipVI GT= I GTG– ------------ Amps1000where I G is reading (in amperes) on meter just prior to V1 dropping.Note: I GT may turn out to be a negative quantity (trigger currentflows out from gate lead). If negative current occurs, I GT value isnot a valid reading. Remove 1 k resistor and use I G as the morecorrect I GT value. This will occur on 12 µA gate products.http://www.littelfuse.com E5 - 10 ©2004 Littelfuse, Inc.+1 972-580-7777 Thyristor Product Catalog