| Distributor | Stock | Pricing | MOQ | PKG | Lead Time | Date Code | On Order Quantity | On Order Delivery | |
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2,500 pcs
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2500 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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The Union Semiconductor UM803RS is a 3-pin microprocessor supervisory circuit designed to monitor power supplies in digital systems. It provides a reliable reset signal when the VCC supply voltage falls below a preset threshold, maintaining the reset for at least 140ms after the voltage recovers. This circuit is suitable for use with +5V, +3.3V, +3.0V, or +2.5V powered systems.
Key features include a precision VCC monitoring capability with a reset threshold of 2.63V, an active-low open-drain output that requires a pull-up resistor, and guaranteed reset validity down to 1V. The UM803RS boasts low supply current of 2μA, making it ideal for portable and battery-powered equipment. It is designed to ignore fast transients on VCC and is fully specified over a wide operating temperature range of -40°C to +85°C.
This supervisor is available in a compact SOT-23-3 (TO-236-3, SC-59) surface-mount package, facilitating integration into space-constrained designs. Its simple, single-function operation and lack of external components contribute to its excellent circuit reliability and low cost.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.08 | $0.08 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The supply voltage is 2.63V.
The UM803RS is available in a SOT-23-3 surface mount package.
-40°C to 85°C.
Open drain or open collector.
Active low.
140ms minimum.
2μA typical.