![]() I am somewhat surprised that region is so large. It is not hard to imagine that there is a transition region between the gate drive being required, and the gate completely losing control. At very small currents (below the latching current) the gate drive is required to maintain conduction. However at lower and lower currents the amount of that feedback is reduced and the gate current becomes significant. ![]() It relies on feedback (essentially) to turn fully on. The reason they don't turn off is that the gate exerts a relatively small influence on the behaviour of the device. ![]() Indeed if you were to make a device from 2 transistors connected together you almost certainly could turn the device off from the gate. If you compare a gate-turn-off thyristor with a normal one, you'll see that the basic structure is exactly the same. I thought you could ground the gate ater exceeding the latching current without interrupting the anode - cathode current flow?įirstly, let me say that I've never observed the behaviour you're talking about. but can someone please confirm that this is normal behaviour for a thyristor? #Persamaan bt169d series#If you send the gate to 0V below 80mA, the thyristor turns off again.Īs a workaround, I can place a diode in series with the gate. On further investigation, it would appear that the device will latch below 80mA, but only if the gate goes to high impedance after switch on (instead of to 0V). 1st non sponsored link back takes you to the datasheet. I have to add additional resistors in paralle with the 1k to get the current above 80mA.Įither NXP have sent out a bad batch of thyristors, or I'm missing something. I've had 10mA into the gate (way above the gate threshold), and it still doesn't latch. Above 80mA it behaves like a thyristor would (remove th gate current and the current still flows between a->c). The datasheet specifies 4mA latching current (anode to cathode), and yet I cannot get the device to latch below 80mA. Thyristor, 400 V, 200 A, 0.5 A, 0.I've received a batch of bt169d (nxt semi) thyristors from farnells. of Pins:3Pins,Peak Non Rep RoHS Compliant: Yes SCR THYRISTOR, 0.8A, 400V, TO-92,Peak Repetitive Off-State Voltage, Vdrm:400V,Gate Trigger Current Max, Igt:50♚,Current It av:500mA,On State RMS Current IT(rms):800mA,Thyristor Case Style:TO-92,No. Thyristor SCR 400V 9A 3-Pin SPT Ammo - Ammo Pack (Alt: BT169D/DG,126) ![]() Thyristor SCR 400V 9A 3-Pin SPT T/R - Tape and Reel (Alt: BT169D-L,116) ![]() Thyristor SCR 400V 9A 3-Pin SPT Bulk - Rail/Tube (Alt: BT169D-L,112) Thyristor SCR 400V 9A 3-Pin SPT Ammo - Bulk (Alt: BT169D126) Thyristor SCR 400V 9A 3-Pin SPT Ammo - Ammo Pack (Alt: BT169D,126) Thyristor SCR 400V 9A 3-Pin SPT Ammo (Alt: BT169D,126) Thyristor SCR 400V 9A 3-Pin SPT T/R - Bulk (Alt: BT169D116) Thyristor SCR 400V 9A 3-Pin SPT T/R - Tape and Reel (Alt: BT169D,116) Thyristor SCR 400V 9A 3-Pin SPT Bulk (Alt: BT169D,112) RS Components Logic Thyristor 400V 0.8A BT169D OMO Electronic Thyristor logic level Newark THYRISTOR, 0.8A, 400V, TO-92 Thyristor/Triac Type:Thyristor Peak Repetitive Off-State Voltage, Vdrm:400V Current, It RMS:0.8A Current, Itsm:9A Current, Igt:200♚ Voltage, Vgt:0.5V Case Style:TO-92 Termination Type:Through RoHS Compliant: Yes Farnell THYRISTOR, 0.8A, 400V, TO-92 Thyristor/Triac Type:Thyristor Peak Repetitive Off-State Voltage, Vdrm:400V Current, It RMS:0.8A Current, Itsm:9A Current, Igt:200♚ Voltage, Vgt:0.5V Case Style:TO-92 Termination Type:Through Hole Current, It AV:0.5A Voltage, Vrrm:400V element14 APAC THYRISTOR, 0.8A, 400V, TO-92 Peak Repetitive Off-State Voltage, Vdrm:400V Gate Trigger Current Max, Igt:200♚ Current It av:0.5A On State RMS Current IT(rms):0.8A Peak Non Rep Surge Current Itsm 50Hz:8A Holding Current Max Ih:5mA Gate Trigger Voltage Max Vgt:0.5V Operating Temperature Range:-40☌ to +150☌ SVHC:No SVHC (1) Current Itsm:9A Package / Case:TO-92 Repetitive Reverse Voltage Vrrm Max:400V Termination Type:Through Hole Thyristor Type:ThyristorīT169D/TO-92/STANDARD MARKING - Rail/Tube (Alt: BT169DEP) ![]()
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