Diodes Incorporated APX803S00-23SR-7

Overview

APX803S00-23SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for precision monitoring of 2.25V power rails. It asserts an active-low RESET signal during power-up, brownout, or supply glitches and holds it for a minimum 1ms timeout after VCC rises above 2.25V. Its 10µA typical supply current, guaranteed operation down to VCC = 1V, and immunity to fast VCC transients make it suitable for battery-powered embedded controllers and portable instrumentation.

For engineers reviewing the APX803S00-23SR-7 datasheet, APX803S00-23SR-7 pinout, APX803S00-23SR-7 application, or APX803S00-23SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), open-drain output compatibility with bidirectional µP reset pins, temperature-stable 30ppm/°C tempco, and SOT23-SR package footprint alignment with PCB layout constraints.

Technical Context

The APX803S00-23SR-7 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.25V (min 2.21V, max 2.30V at +25°C). Its internal timer initiates only after VCC exceeds the threshold, generating a fixed 1ms–3.3ms active-low reset pulse width.

It features an open-drain RESET output capable of sinking ≥1.2mA at 0.3V low-level voltage while operating across –40°C to +85°C ambient. The device remains functional with VCC as low as 1.0V, ensuring deterministic reset assertion during deep brownout conditions before system logic becomes unreliable.

Key Specifications

Pinout & Package

APX803S00-23SR-7 is housed in a RoHS-compliant SOT23-3 (SR variant) package with gull-wing leads, 1.3mm body width, and 2.9mm 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 APX803S00-23SR-7, the SA variant offers identical functionality but demands PCB layout revision, while the MAX809TRD3-T trades open-drain flexibility and ultra-low current for longer reset duration and push-pull drive-making it unsuitable for bidirectional reset interfaces or energy-constrained designs.

Availability

APX803S00-23SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical handheld diagnostics, and smart meter communication modules requiring stable component supply across extended product lifecycles.

Supply support for APX803S00-23SR-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 and consumer markets.

The APX803S series belongs to Diodes' precision voltage supervisor product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications demanding low quiescent current and wide temperature operation.

FAQ

What is the exact reset threshold voltage for APX803S00-23SR-7?

The APX803S00-23SR-7 has a nominal reset threshold of 2.25V, with a guaranteed range of 2.21V to 2.30V at +25°C. This value is specified in the Electrical Characteristics table of DS39161 Rev. 2–2, and its temperature coefficient is tightly controlled at 30ppm/°C across –40°C to +85°C.

Can APX803S00-23SR-7 drive a reset line shared with other open-drain devices?

Yes-the APX803S00-23SR-7's open-drain RESET output is explicitly designed for wired-OR configurations. When multiple supervisors share a single reset bus, each pulls low independently, and a single external pull-up resistor sets the high state, enabling coordinated system reset without contention.

Does APX803S00-23SR-7 require an external capacitor for timing?

No-APX803S00-23SR-7 uses an internal RC timer and requires no external timing components. Its 1.7ms typical reset timeout is factory-trimmed and fully specified across temperature; only a 100nF bypass capacitor on VCC is recommended for noise immunity per the Typical Applications Circuit.

Is APX803S00-23SR-7 compatible with 1.8V microcontrollers?

Yes-while its reset threshold is 2.25V, the device operates with VCC as low as 1.0V and guarantees valid RESET output down to that level. It can supervise a 2.5V rail powering a 1.8V µP, provided the RESET line is pulled up to the µP's I/O voltage (e.g., 1.8V) and the supervisor's VCC is derived from the monitored 2.5V rail.