Analog Devices MAX6381LT46D3+T, Simple Reset/Power-On Reset IC, Active Low, Push-Pull Output, 4.63V Threshold, 140ms Minimum Reset Timeout, -40°C to 125°C, 6-WFDFN / 6-uDFN (1.5x1) Package, Surface Mount, ROHS3 Compliant.
| Parameter | Value |
|---|---|
| Type | Simple Reset/Power-On Reset |
| Mounting | Surface Mount |
| Voltage - threshold | 4.63V |
| Number of voltages monitored | 1 |
| Operating temperature | -40°C ~ 125°C (TA) |
| Reset | Active Low |
| Output | Push-Pull, Totem Pole |
| Package | Strip |
| Reset timeout | 140ms Minimum |
| Case | 6-WFDFN |
The 6-uDFN package (1.5x1 mm) is tiny — you will need a microscope to read the marking, but the footprint saves real estate on a dense board. Surface-mount only; no socket option here, so plan for reflow or hot-air rework.
ROHS3 compliant, so it clears European and global assembly lines without exemption paperwork.
The reset threshold voltage is 4.63V. This is the voltage at which the device asserts reset as the supply falls, and releases reset after the timeout once the supply rises above this level.
The MAX6381 family includes multiple threshold voltage options. The LT46D3 variant is fixed at 4.63V. If your design calls for a different threshold, you would need a different suffix within the MAX6381 family — they share the same pinout and package options, but the threshold is set at the factory and not adjustable.
Both are simple reset ICs, but the MAX6381 offers more threshold voltage options and a smaller package (6-uDFN vs SOT-23 for the MAX803). The MAX803 uses an open-drain output that requires an external pull-up resistor, while the MAX6381LT46D3+T uses a push-pull output that drives the reset line directly without a pull-up.