Diodes Incorporated APX811-46UG-7

Overview

APX811-46UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input, precision 4.63 V reset threshold, push-pull active-low RESET output, and 200 ms power-on reset delay. It operates across –40°C to +85°C in SOT143 package and monitors 5.0 V supply rails in embedded controllers and portable equipment.

For engineers reviewing the APX811-46UG-7 datasheet, APX811-46UG-7 pinout, APX811-46UG-7 application, or APX811-46UG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), MR input compatibility with TTL/CMOS logic, guaranteed RESET assertion down to VCC = 1.0 V, and industrial-grade thermal performance in space-constrained designs.

Technical Context

The APX811-46UG-7 implements a precision bandgap-based voltage monitor with internal 240 ms timeout timer and active-low push-pull output stage. Its reset threshold is trimmed to 4.63 V ±1.5% at 25°C and maintains stability across –40°C to +85°C.

It features a dedicated active-low manual reset (MR) input that forces RESET assertion independent of VCC level, and guarantees valid RESET output for VCC ≥ 1.0 V - requiring external pull-down only if operation below 1.0 V is needed.

Key Specifications

Pinout & Package

APX811-46UG-7 is housed in a lead-free, RoHS-compliant SOT143 (TO-236) surface-mount package measuring 2.9 mm × 1.3 mm × 1.0 mm, with gull-wing leads optimized for automated assembly and thermal dissipation (θJA = 240°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX811-46UG-7 uniquely combines 5 V-specific 4.63 V threshold accuracy, integrated MR input, push-pull output, and SOT143 footprint-making it optimal for cost-sensitive, space-constrained 5 V microcontroller supervision where manual reset and zero-BOM reset drive are required.

Availability

APX811-46UG-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX811-46UG-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The APX811/812 series belongs to Diodes' microprocessor supervisor product line, engineered specifically for precision voltage monitoring and deterministic reset generation in resource-constrained embedded systems operating across industrial temperature ranges.

FAQ

What is the exact reset threshold voltage and its tolerance for APX811-46UG-7?

The APX811-46UG-7 has a nominal reset threshold of 4.63 V, with a guaranteed tolerance of ±1.5% over the full operating temperature range (–40°C to +85°C). This value is laser-trimmed during production and confirmed per Electrical Characteristics table on page 4 of DS31960 Rev. 2. At 25°C, typical variation is ±0.03 V (4.60–4.66 V).

Does APX811-46UG-7 require an external pull-up resistor on the RESET pin?

No. The APX811-46UG-7 features a push-pull output stage, so RESET actively drives low and high without needing an external pull-up. This reduces component count and improves transition speed. Only if RESET must remain valid below VCC = 1.0 V (e.g., for ultra-low-voltage brownout handling) is a 100 kΩ pull-down recommended per Application Information section on page 7.

How does the manual reset (MR) input behave during power-up or brownout?

The MR input is active-low and fully functional across the entire VCC operating range (1.1 V to 5.5 V). When MR is pulled low, RESET asserts immediately regardless of VCC level or threshold crossing. During brownout, MR retains validity - enabling system-level reset even when VCC dips below 4.63 V but remains above 1.1 V, ensuring fail-safe control.

Is APX811-46UG-7 qualified for automotive applications?

The APX811-46UG-7 is specified for industrial temperature range (–40°C to +85°C) and RoHS-compliant, but it is not AEC-Q100 qualified. Diodes Incorporated does not list it in their automotive-grade portfolio. For automotive body electronics, users must perform their own qualification per application requirements; the device is commonly used in non-safety-critical BCM subsystems where full AEC-Q100 is not mandated.