Diodes Incorporated APX803S00-40SR-7

Overview

APX803S00-40SR-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with open-drain active-low RESET output, 4.00 V reset threshold (±0.06 V), 1.7 ms typical reset timeout, and guaranteed operation down to VCC = 1.0 V. It monitors 5.0 V supply rails in embedded controllers and portable systems, asserting reset during power-up, brownout, or supply glitches.

For engineers reviewing the APX803S00-40SR-7 datasheet, APX803S00-40SR-7 pinout, APX803S00-40SR-7 application, or APX803S00-40SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06 V at +25°C), low 10 µA supply current, open-drain drive capability up to 3.5 mA sink, and SOT23-SR package compatibility with space-constrained PCB layouts.

Technical Context

The APX803S00-40SR-7 integrates a precision voltage comparator with internal hysteresis and a fixed-duration monostable timer. Its reset assertion logic responds to VCC falling below 4.00 V and holds RESET low for ≥1 ms after VCC rises above the threshold.

Designed for single-supply monitoring, it features ESD protection (3 kV HBM), operates across –40°C to +85°C, and guarantees valid RESET output state for VCC ≥ 1.0 V - enabling reliable boot sequencing even during deep brownout conditions.

Key Specifications

Pinout & Package

APX803S00-40SR-7 is housed in a RoHS-compliant SOT23-3 (SR) package with gull-wing leads, 1.3 mm body width, and 2.9 mm length per Diodes Incorporated package outline SOT23.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S00-40SA-7, the SR variant offers identical electrical performance with a different pin mapping optimized for specific routing constraints; compared with TPS3808G01DBVR, it trades threshold precision and quiescent current for faster reset release and open-drain flexibility in multi-rail systems.

Availability

APX803S00-40SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for APX803S00-40SR-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 consumer markets.

The APX803S series belongs to Diodes' microprocessor supervisory product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring precise, low-power reset functionality across wide temperature ranges.

FAQ

What is the minimum VCC required for valid RESET output assertion?

The APX803S00-40SR-7 guarantees correct RESET logic state (low when asserted) for VCC ≥ 1.0 V. Below 1.0 V, the output becomes high-impedance and cannot sink current - this aligns with typical µP inactivity thresholds and avoids undefined states during deep brownout.

Can APX803S00-40SR-7 interface directly with a microcontroller having a bidirectional RESET pin?

Yes. Its open-drain RESET output allows direct connection to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pull-up resistor. Either the APX803S or the µP can assert reset, enabling coordinated system-level recovery without additional logic.

How does the 1.7 ms reset timeout differ from other APX803S variants?

The "00" suffix denotes 1.7 ms typical timeout (≥1 ms min), distinct from "05" (50 ms) and base "blank" (240 ms) variants. This shorter duration reduces boot latency in time-critical applications while still exceeding minimum µP reset pulse width requirements (typically ≥100 µs).

Is an external pull-up resistor required on the RESET pin?

Yes. The open-drain RESET output requires an external pull-up resistor to the target logic supply (e.g., 3.3 V or 5.0 V). Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements; Diodes recommends verifying with actual board parasitics.