MAX809SQ308T1G

The MAX809SQ308T1G is a Maxim (now Analog Devices) microprocessor supervisory/reset IC. It monitors the supply (Vcc) and generates a reset signal for a microcontroller when the supply falls below its fixed threshold (308 = about 3.08 V) and releases reset once the voltage is back above the threshold with a defined delay. It also provides a manual reset input for an external push-button. The reset output is a logic-compatible signal (active-low on most versions) suitable for MCU reset lines. This device is designed for robust MCU startup/shutdown handling in 3V–5V systems, with low quiescent current and fast, clean reset timing. Package SQ308 in T1G is a small RoHS-compliant package. For exact electrical specs, pinout, and timing (including reset delay and hysteresis), refer to the datasheet.

MAX809SQ308T1G is a 3.08 V reset supervisor in SOT-23. Equivalents from other vendors include: TI TLV803 or TPS3700 family (3.08 V option); Microchip MCP1316/1317; Analog Devices ADM803/ADM809; Onsemi NCP431/NCP431A (3.0–3.3 V options). Check exact threshold, hysteresis, output type (push-pull/open-drain), voltage range, and package in datasheets.

Here are the typical features of MAX809SQ308T1G:
- Fixed reset threshold of 3.08V (for 3V systems)
- Active-low RESET output (RST#), push-pull drive
- Automatic power-on reset with safe release after VCC stabilizes
- Very low quiescent current (low-power operation)
- No external components required
- SmallPb-free package (T1G), 6-pin footprint (compact package)
- Wide operating voltage range (suitable for 2.7V–5.5V systems)
- Broad temperature range (-40°C to +125°C) for industrial/automotive use
- Robust ESD protection
Note: exact specs (tolerances, current values, and package details) can vary by revision; consult the datasheet for precise numbers.

- Pin count: 8 pins (SQ package)
- Function: Single‑channel voltage supervisor/reset IC. Monitors Vcc and generates a reset signal for microcontrollers, providing proper power‑on and power‑down reset behavior.

Manufacturer: Maxim Integrated Products (now part of Analog Devices, Inc.).
What kind of company: A semiconductor company that designs and manufactures analog and mixed-signal integrated circuits (Maxim was an independent fabless producer; now integrated into Analog Devices).

MAX809SQ308T1G is a voltage supervisor/reset generator. Typical application areas:
- Microcontroller/microprocessor reset supervision with power-on and brown-out protection
- Power-on reset generation for digital ICs (FPGAs, DSPs, ASICs)
- Monitoring supply rails in battery-powered/portable devices and IoT
- Reset signaling in consumer electronics (routers, printers, set-top boxes, hard drives)
- Any design requiring a clean, deterministic reset derived from Vcc during power-up/power-down or voltage dips
In short: ensure reliable system resets across embedded, consumer, and mixed-signal electronics.

SC-70 (SOT-23-3) 3-pin surface-mount package; RoHS lead-free.