Key Specifications

Complete manufacturer part number	TYN840RG
Manufacturer	STMicroelectronics
Description	40 A standard SCRs
Package / case	TO-220AB
Product category	SCR thyristors
Pins	3
Repetitive peak off-state voltage (VDRM/VRRM)	800 V
Operating junction temperature (TJ; manufacturer rated interval)	-40 °C to 125 °C
RMS on-state current (180-degree conduction angle; TC 95 C)	40 A
Gate trigger current limits (VD12 V, RL33 ohm, TJ25 C)	3.5 mA minimum; 35 mA maximum
Maximum peak reverse gate voltage	5 V
Storage junction temperature (Tstg; not operating)	-40 C to 150 C
Electrical characterization context	TJ25 C unless the individual row specifies otherwise; current ratings use case temperature and conduction angle, not ambient temperature.
Packing type	Tube
RoHS compliant	Ecopack2
Grade	Industrial
In stock	Contact for availability
Unit price	Request a quote
Lead time	To be confirmed

Technical documentation and image source

Exact ST ordering page verified on 2026-11-04. Temperature labels preserve manufacturer ordering scope; ambient or junction basis is not inferred. Package reference image is not a stock-lot photograph. Consult the datasheet for electrical limits and test conditions.

Manufacturer package reference image for TO-220AB. Confirm electrical pin functions in the datasheet. Actual lot appearance and top marking require current-lot confirmation.

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