Diodes Incorporated APX803S-46SA-7

Overview

APX803S-46SA-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with open-drain active-low RESET output, precision 4.63 V reset threshold (±0.07 V), 240 ms minimum reset timeout, 10 µA typical supply current, and guaranteed operation down to VCC = 1 V. It monitors 5.0 V power rails in embedded microcontroller systems to prevent erroneous code execution during power-up, brownout, or supply glitches.

For engineers reviewing the APX803S-46SA-7 datasheet, APX803S-46SA-7 pinout, APX803S-46SA-7 application, or APX803S-46SA-7 equivalent, key selection criteria include reset threshold accuracy at temperature, open-drain drive capability into external pull-ups, fixed 240 ms timeout duration, low-voltage validity (VCC ≥ 1 V), and SOT23-3 (SA) package compatibility with space-constrained PCB layouts.

Technical Context

The APX803S-46SA-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco and internal timing circuitry that asserts RESET low for ≥140 ms (typ. 240 ms) after VCC rises above 4.63 V. Its open-drain output requires an external pull-up resistor and supports bidirectional reset interfacing with microcontrollers like the Motorola 68HC11.

It ignores fast transients on VCC via built-in noise immunity and guarantees valid logic-low RESET output for VCC ≥ 1 V. Below 1 V, the output becomes high-impedance - a design feature aligned with system-level power sequencing where µP functionality ceases below 1 V.

Key Specifications

Pinout & Package

SOT23-3 (SA package), surface-mount, 2.9 mm × 1.3 mm footprint, 0.95 mm max height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX809S-46SA-7 and MAX809SEUR+T, the APX803S-46SA-7 offers lowest quiescent current and flexible open-drain interfacing, making it optimal for multi-rail or shared-reset architectures where external pull-up control is preferred.

Availability

APX803S-46SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for APX803S-46SA-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 automotive markets.

The APX803S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained embedded systems needing precise, low-power reset assertion across standard logic supply rails.

FAQ

What is the exact reset threshold voltage for APX803S-46SA-7?

The APX803S-46SA-7 has a nominal reset threshold of 4.63 V, with a guaranteed range of 4.56 V to 4.70 V at +25°C and ±30 ppm/°C temperature coefficient over –40°C to +85°C. This value is laser-trimmed during production and verified per DS39161 Rev. 2-2.

Can APX803S-46SA-7 drive a 10 kΩ pull-up resistor to 3.3 V?

Yes - its open-drain RESET output sinks ≥1.2 mA at VOL ≤ 0.3 V when VCC ≥ VTH − 0.2 V, enabling reliable low-state drive into a 10 kΩ pull-up to 3.3 V (resulting in <0.3 V logic low). Verified per Electrical Characteristics table in DS39161.

Does APX803S-46SA-7 assert reset during fast VCC transients?

No - the internal comparator incorporates noise immunity circuitry that rejects transients shorter than ~20 µs (tS = 20 µs max), preventing false resets from switching noise or ESD-induced supply spikes. This behavior is confirmed in the Timing Diagram and Functional Description sections.

Is the SOT23-3 (SA) package footprint compatible with JEDEC MO-178AA?

Yes - the SA package matches JEDEC MO-178AA mechanical dimensions: 2.90 mm × 1.30 mm body, 0.95 mm max height, 0.915 mm lead pitch, and 0.535 mm lead width. Diodes' official package outline PDF confirms full compliance with this standard.