4.6V threshold — why this part exists
The BD4746G-TR is a single-channel voltage detector from ROHM's BD47xx series, with a fixed threshold of 4.6V. That's the number that matters: most supervisors trip at 2.5V, 3.3V, or 5.0V, but a 4.6V threshold sits right between a nominal 5V rail and its undervoltage lockout. If you're monitoring a 5V supply that must stay above 4.6V before the system is allowed to run, this is the part that keeps the MCU from booting into a brownout.
Open drain, active low — bench wiring
The reset output is open drain, active low.
Temperature range — indoor and mild environments
Rated -40°C to 75°C ambient.
Package and footprint — SC-74A / SOT-753
Housed in a 5-pin SC-74A (also marked SOT-753). The supplier device package is 5-SSOP.
Lifecycle — still in active production
ROHM lists the BD4746G-TR as Active. No last-time-buy notice, no EOL flag. For the BOM engineer, that means no supply-chain scramble for a drop-in replacement — this part is being manufactured today and will be for the foreseeable future. ROHS3 compliant, so it passes the environmental spec without an exemption.