Diodes Incorporated APX809S-26SR-7

Overview

APX809S-26SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in embedded digital systems. It monitors +2.63 V supply rails with ±0.04 V threshold accuracy, asserts an active-low push-pull RESET signal for ≥240 ms after power recovery, and operates down to VCC = 1.0 V-enabling reliable reset generation in battery-powered controllers and portable instrumentation.

For engineers reviewing the APX809S-26SR-7 datasheet, APX809S-26SR-7 pinout, APX809S-26SR-7 application, or APX809S-26SR-7 equivalent, key selection criteria include reset threshold tolerance (±0.04 V), guaranteed operation at 1 V supply, 7 µA typical quiescent current, and SOT23-3 (SR) package compatibility with space-constrained PCB layouts.

Technical Context

The APX809S-26SR-7 integrates a precision bandgap reference, comparator, and push-pull output stage in a single die. Its reset assertion logic is triggered when VCC falls below 2.63 V (typ.), with hysteresis of ~0.04 V and temperature coefficient of 30 ppm/°C-ensuring stable trip points across −40°C to +125°C ambient.

Reset timeout is internally timed to 240 ms (typ.) after VCC exceeds the threshold, independent of external RC components. The output remains valid and monotonic over VCC = 1.0–5.5 V, with VOL ≤ 0.3 V at 1.2 mA sink and VOH ≥ 0.8×VCC at 500 µA source-supporting direct interfacing to 1.8 V–5 V logic families.

Key Specifications

Pinout & Package

SOT23-3 (SR) package: 1.30 mm × 2.40 mm × 0.915 mm body, gull-wing leads, RoHS-compliant "Green" molding compound (Br/Cl <1500 ppm total, Sb <1000 ppm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G12DBVR, APX809S-26SR-7 delivers lowest quiescent current (7 µA) and widest valid VCC range (1.0–5.5 V) in a no-component-required SOT23-3 package-making it optimal for ultra-low-power, space-constrained, and deep-discharge applications.

Availability

APX809S-26SR-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical sensors, smart metering terminals, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX809S-26SR-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for high-accuracy, low-power reset generation in battery-operated and thermally demanding embedded systems.

FAQ

What is the minimum VCC voltage at which APX809S-26SR-7 guarantees correct RESET output logic state?

The device guarantees valid RESET output behavior down to VCC = 1.0 V, as specified in the Recommended Operating Conditions table. At this voltage, the internal comparator remains functional and the push-pull output maintains correct logic levels-critical for systems powered by single-cell Li-ion or alkaline batteries nearing end-of-life.

Does APX809S-26SR-7 require an external capacitor for reset timing?

No. The 240 ms (typ.) reset timeout is generated by an internal oscillator and timer circuit-no external capacitor or resistor is needed. This simplifies layout, reduces bill-of-materials cost, and improves reliability compared to RC-based supervisors.

How does the APX809S-26SR-7 handle fast voltage transients on the VCC line?

The reset comparator incorporates built-in noise filtering that ignores transients shorter than 20 µs, as verified in the Electrical Characteristics table under t_S. This prevents false resets during switching regulator ripple, ESD events, or load-dump-induced spikes without requiring additional input filtering components.

Is the SOT23-3 (SR) package of APX809S-26SR-7 compatible with standard SOT23 reflow profiles?

Yes. The SR variant uses the same JEDEC-standard SOT23-3 footprint and thermal profile as SA. Its dimensions (1.30 mm × 2.40 mm × 0.915 mm) and lead pitch (0.95 mm) match IPC-7351B recommendations, supporting automated pick-and-place and standard lead-free reflow soldering (peak 260°C, 10 s max).