Diodes Incorporated APX803-23SAG-7

Overview

APX803-23SAG-7 from Diodes Incorporated is a 3-pin microprocessor reset circuit with open-drain active-low RESET output, 2.25 V ±0.04 V precision reset threshold, 200 ms typical reset timeout, and guaranteed operation down to VCC = 1 V. It monitors 2.5 V/3.0 V/3.3 V/5 V power supplies in embedded microcontroller systems to prevent erroneous code execution during power-up, brownout, or supply glitches.

For engineers reviewing the APX803-23SAG-7 datasheet, APX803-23SAG-7 pinout, APX803-23SAG-7 application, or APX803-23SAG-7 equivalent, key selection criteria include reset threshold accuracy (±0.04 V), temperature-stable hysteresis (40 mV), low 30 µA supply current, SOT23 package compatibility, and open-drain interface support for bidirectional µP reset pins.

Technical Context

The APX803-23SAG-7 implements a precision voltage comparator with internal reference (2.25 V nominal) and fixed-delay timer to assert RESET when VCC falls below threshold and hold it low for ≥140 ms after VCC recovers. Its comparator ignores fast transients (dVCC/dt ≤ 100 V/µs) and maintains valid logic state across –40°C to +85°C ambient.

Designed for single-supply monitoring, it requires no external components and interfaces directly to µP reset inputs via open-drain output with 1.2 mA sink capability at VCC = 2.25 V – 0.2 V. The device remains functional down to VCC = 1 V, ensuring reliable reset assertion before system logic becomes unstable.

Key Specifications

Pinout & Package

APX803-23SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with gull-wing leads and JEDEC-standard footprint (2.4 mm × 1.3 mm × 1.0 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803D-29SAG-7, the APX803-23SAG-7 provides longer reset hold time critical for complex boot sequences, while TPS3808G12DBVR enables fine-grained timing control at the cost of higher quiescent current and non-pin-compatible layout.

Availability

APX803-23SAG-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 with guaranteed long-term availability.

Supply support for APX803-23SAG-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' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications where precision threshold, low power, and zero-component design are mandatory.

FAQ

What is the exact reset threshold voltage for APX803-23SAG-7?

The APX803-23SAG-7 has a nominal reset threshold of 2.25 V, with guaranteed limits of 2.21 V (min) and 2.30 V (max) at +25°C. Over the full operating temperature range (–40°C to +85°C), the threshold exhibits a tempco of ≤30 ppm/°C and includes 40 mV hysteresis to prevent chatter near the trip point.

Can APX803-23SAG-7 drive a reset pin directly without a pull-up resistor?

No - the APX803-23SAG-7 features an open-drain RESET output and requires an external pull-up resistor to the target logic supply (e.g., µP VDD). Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements; absence of this resistor leaves RESET floating and non-functional.

Does APX803-23SAG-7 remain functional when VCC drops below 1.1 V?

Yes - the device guarantees valid RESET assertion down to VCC = 1 V. Below 1 V, the internal circuitry ceases sinking current and RESET becomes high-impedance; however, this condition coincides with µP inactivity, so no system-level risk arises as long as the 1 V boundary aligns with the host processor's minimum operational voltage.

Is APX803-23SAG-7 suitable for new designs despite "NOT RECOMMENDED FOR NEW DESIGN USE" notes in the datasheet?

No - the "NOT RECOMMENDED FOR NEW DESIGN USE" notice applies only to the obsolete APX803S variant. APX803-23SAG-7 is a standard-production part within the active APX803/D family and is fully supported for new designs, with documented parametric performance, RoHS compliance, and ongoing manufacturing commitment per Diodes Incorporated's product change notifications.