Diodes Incorporated APX803S05-26SR-7

Overview

APX803S05-26SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 2.63 V ±0.04 V supply monitoring in embedded systems. It asserts an active-low RESET signal during power-up, brownout, or voltage dip below threshold and maintains it for 50 ms (typ.) after VCC recovers. Used in portable equipment and µP-based controllers where low quiescent current (10 µA typ.) and guaranteed reset validity down to VCC = 1 V are critical.

For engineers reviewing the APX803S05-26SR-7 datasheet, APX803S05-26SR-7 pinout, APX803S05-26SR-7 application, or APX803S05-26SR-7 equivalent, key selection criteria include reset threshold accuracy (2.59–2.67 V), timeout duration (20–70 ms), open-drain output compatibility with bidirectional µP reset pins, and operation across –40°C to +85°C ambient temperature.

Technical Context

The APX803S05-26SR-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco to detect VCC drops below 2.63 V. Its internal timer initiates only after VCC rises above the threshold, ensuring deterministic 50 ms (typ.) reset assertion independent of transient noise.

With open-drain RESET output, it supports wired-OR configurations and level-shifting across supply domains. The device guarantees valid logic-low output for VCC ≥ 1 V and enters high-impedance state below 1 V - eliminating false releases during deep undervoltage conditions.

Key Specifications

Pinout & Package

APX803S05-26SR-7 is housed in a RoHS-compliant SOT23-3 (SR package) with gull-wing leads and standard 0.95 mm pitch. Thermal resistance is θ_JA = 232°C/W, suitable for PCBs with minimal copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S05-26SA-7, the SR variant offers identical supervision performance but different mechanical mounting orientation and thermal path; versus TPS3808G01DBVR, it trades longer timeout and enable flexibility for lower cost, smaller size, and simpler integration in fixed-timing applications.

Availability

APX803S05-26SR-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.

Supply support for APX803S05-26SR-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, specializing in high-reliability power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precision voltage thresholds and guaranteed low-power operation across extended temperature ranges.

FAQ

What is the exact reset threshold voltage range for APX803S05-26SR-7?

The APX803S05-26SR-7 has a guaranteed reset threshold range of 2.59 V (minimum) to 2.67 V (maximum) at +25°C, with ±0.04 V tolerance maintained over –40°C to +85°C ambient temperature per datasheet DS39161 Rev. 2–2. This corresponds to a nominal 2.63 V trip point with 30 ppm/°C tempco.

Can APX803S05-26SR-7 drive a reset line shared with other open-drain devices?

Yes - its open-drain RESET output is explicitly designed for wired-OR configurations. Multiple APX803S05-26SR-7 units or compatible supervisors can share one reset bus with a single pull-up resistor. No level-shifting or isolation is required as long as all devices reference the same ground and pull-up voltage domain.

Does APX803S05-26SR-7 assert reset during fast VCC transients?

No - the internal comparator is designed to reject fast transients on VCC, with dVCC/dt immunity up to 100 V/µs. Reset assertion occurs only when VCC remains below the 2.63 V threshold for longer than the internal sampling window, preventing false triggers from switching noise or ESD-induced spikes.

What happens to the RESET output when VCC falls below 1 V?

When VCC drops below 1 V, the APX803S05-26SR-7 ceases to sink current on the RESET pin and transitions to a high-impedance state. This is intentional: since most µPs are nonfunctional below 1 V, the open-circuit condition avoids contention and eliminates leakage paths that could impede system shutdown or battery preservation.