Diodes Incorporated APX803-44SAG-7

Overview

APX803-44SAG-7 from Diodes Incorporated is a 3-pin microprocessor reset circuit with open-drain active-low RESET output, precision 4.38 V reset threshold (±0.07 V), 200 ms typical reset timeout, and guaranteed operation down to VCC = 1 V. It monitors 5 V supply rails in embedded controllers and portable systems, asserting reset during power-up, brownout, or supply glitches without external components.

For engineers reviewing the APX803-44SAG-7 datasheet, APX803-44SAG-7 pinout, APX803-44SAG-7 application, or APX803-44SAG-7 equivalent, key selection criteria include reset threshold accuracy, timeout duration, open-drain drive capability, low 30 µA supply current, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803-44SAG-7 implements a voltage-monitoring comparator with internal hysteresis (40 mV) and a fixed-delay timer that initiates upon VCC crossing the 4.38 V threshold. Its open-drain output requires an external pull-up and supports bidirectional reset interfaces with microcontrollers like the Motorola 68HC11.

It operates across -40°C to +85°C ambient temperature, maintains valid reset assertion for VCC ≥ 1 V, and ignores fast transients on VCC due to built-in noise immunity-ensuring robust reset behavior during supply ripple or coupling events.

Key Specifications

Pinout & Package

APX803-44SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 2.4 mm × 1.3 mm footprint and 0.95 mm height. Thermal resistance is θ_JA = 201°C/W on standard FR-4 board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX809-44SAG-7, this part trades push-pull convenience for open-drain flexibility and lower cost; versus TPS3808G33DBVR, it offers higher threshold accuracy for 5 V rails but consumes more quiescent current-making it optimal for cost-sensitive industrial 5 V applications where 200 ms timeout and 4.38 V trip are mandatory.

Availability

APX803-44SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-lifecycle support.

Supply support for APX803-44SAG-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, computing, and consumer markets.

The APX803 series belongs to Diodes' µP supervisory product line, engineered specifically for cost-effective, component-free reset generation in 1.1 V–5.5 V digital systems-prioritizing threshold precision, temperature stability, and minimal footprint.

FAQ

What is the exact reset threshold voltage for APX803-44SAG-7, and how tightly is it specified?

The APX803-44SAG-7 has a nominal reset threshold of 4.38 V, with guaranteed limits of 4.31 V (min) and 4.45 V (max) across -40°C to +85°C. This ±0.07 V tolerance ensures consistent triggering on 5 V rails without requiring system-level calibration or margining adjustments.

Can APX803-44SAG-7 drive a reset line directly connected to a 3.3 V microcontroller?

Yes-the open-drain RESET output can interface with 3.3 V logic when pulled up to the 3.3 V rail. The device guarantees valid low-state output down to VCC = 1 V, and its 3.5 mA sink capability at VCC ≥ 4.0 V meets standard 3.3 V CMOS input requirements with margin.

Does APX803-44SAG-7 require any external passive components to function?

No external components are required for basic operation. Only an external pull-up resistor on the RESET pin is needed for open-drain functionality. No capacitors, resistors, or trimming elements are necessary-enabling true "single-chip" reset supervision in space-constrained designs.

Is APX803-44SAG-7 suitable for automotive applications per AEC-Q200?

No-APX803-44SAG-7 is not AEC-Q200 qualified. While it operates across -40°C to +85°C and exhibits robust transient immunity, Diodes Incorporated does not certify this variant for automotive use. For automotive-grade reset supervision, consider the AEC-Q200–qualified APX811 series instead.