The XL0840 is a sensitive-gate silicon controlled rectifier in a TO-92-3 through-hole package, rated for 400 V off-state and 800 mA RMS on-state continuous current. The 200 µA maximum gate trigger current lets it switch directly from a microcontroller GPIO, a comparator output, or a low-side sensor — no separate driver transistor needed.
XL0840 SCR, Sensitive Gate, 400 V, 800 mA, TO-92-3
MPNXL0840
End of Life
XL0840, Sensitive Gate SCR, 400 V Off State, 800 mA RMS On State, 200 µA Gate Trigger, TO-92-3 Through Hole, -40°C to 125°C.
$0.55Ref. price · indicative, final on quote
PackagingTO-226-3, TO-92-3 (TO-226AA)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| SCR type | Sensitive Gate |
| Mounting | Through Hole |
| Voltage - off state | 400 V |
| Voltage - on state (Vtm) | 1.95 V |
| Voltage - gate trigger (Vgt) | 800 mV |
| Current - hold (Ih) | 5 mA |
| Current - off state | 1 µA |
| Current - gate trigger (Igt) | 200 µA |
| Current - on state (It (AV)) | 500 mA |
| Current - on state (It (RMS)) | 800 mA |
| Current - non rep. surge 50, 60Hz | 7A, 8A |
| Operating temperature | -40°C ~ 125°C |
| Package | Bag |
| Case | TO-226-3, TO-92-3 (TO-226AA) |
Product details
Frequently asked questions
What is the gate trigger current of the XL0840?
The maximum gate trigger current (Igt) is 200 µA. This low threshold lets the SCR be driven directly from a logic output or a low-current sensor without an intermediate driver stage.
What is the closest functional second-source for the XL0840?
The X00602MA 1AA2 is a sensitive-gate, through-hole, TO-92 SCR with a 600 V off-state rating. It is a functional alternative for designs that can accept the higher voltage headroom.