Diodes Incorporated APX803S00-26SA-7

Overview

APX803S00-26SA-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with open-drain active-low RESET output, 2.63 V ±0.04 V precision reset threshold, 1.7 ms typical reset timeout, 10 µA typical supply current, and guaranteed operation down to VCC = 1 V. It monitors 2.5–5.0 V power rails in embedded microcontroller systems requiring reliable brownout detection and power-on reset assertion.

For engineers reviewing the APX803S00-26SA-7 datasheet, APX803S00-26SA-7 pinout, APX803S00-26SA-7 application, or APX803S00-26SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04 V), ultra-low quiescent current (10 µA), fixed 1.7 ms timeout timing, open-drain interface compatibility with bidirectional µP reset pins, and SOT23-3 (SA) package footprint.

Technical Context

The APX803S00-26SA-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco and internal timer circuitry that asserts RESET low when VCC falls below 2.63 V and holds it for ≥1 ms after VCC rises above threshold. Its open-drain output requires an external pull-up resistor and supports level-shifting across supply domains.

It guarantees valid logic-low RESET output for VCC ≥ 1 V, ignores fast transients on VCC via built-in noise immunity, and maintains correct output state across –40°C to +85°C ambient temperature range without external trimming components.

Key Specifications

Pinout & Package

The APX803S00-26SA-7 is housed in a RoHS-compliant, lead-free SOT23-3 (SA) surface-mount package with 2.9 mm × 1.3 mm footprint and 0.95 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S00-26SA-7, the APX809S-26SA-7 simplifies BOM by removing the pull-up resistor but sacrifices multi-device reset coordination, while the MAX809SEUR+T trades shorter timeout for 6× lower ICC and longer qualification history in automotive-grade programs.

Availability

APX803S00-26SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for APX803S00-26SA-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.

The APX803S series belongs to Diodes' µP supervisor product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring precision voltage monitoring and deterministic reset timing without external components.

FAQ

What is the exact reset threshold voltage for APX803S00-26SA-7?

The APX803S00-26SA-7 has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.59 V to 2.67 V at +25°C. This value is factory-trimmed and specified over the full –40°C to +85°C operating temperature range with a maximum tempco of 30 ppm/°C.

Does APX803S00-26SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 4.7 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements. No pull-up is needed if driving a CMOS input with internal weak pull-up enabled.

Can APX803S00-26SA-7 supervise a 2.5 V supply rail?

Yes - its 2.63 V threshold is optimized for reliable supervision of 2.5 V systems, providing ~5% headroom above nominal rail voltage to accommodate tolerance stack-up and ripple. The device remains fully functional down to VCC = 1.0 V, ensuring valid reset assertion even during severe brownout.

How does the 1.7 ms reset timeout compare to other APX803S variants?

The "00" suffix denotes the shortest timeout option: 1.7 ms typical (≥1 ms min), distinct from "05" (50 ms) and blank-suffix (240 ms) variants. This timing is engineered for fast-boot µPs and SoCs where extended reset hold would delay system responsiveness without adding safety benefit.