Diodes Incorporated APX809-46SAG-7

Overview

APX809-46SAG-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with active-low push-pull RESET output, precision 4.63 V reset threshold (±0.07 V over -40°C to +85°C), 200 ms typical reset timeout, 30 µA supply current, and guaranteed operation down to VCC = 1 V. It monitors 5 V power rails in embedded microcontroller systems to prevent erroneous code execution during power-up, brownout, or shutdown.

For engineers reviewing the APX809-46SAG-7 datasheet, APX809-46SAG-7 pinout, APX809-46SAG-7 application, or APX809-46SAG-7 equivalent, this page delivers verified electrical parameters, SOT23 package mapping, functional role in power sequencing, and validated drop-in alternatives for industrial control and portable equipment design.

Technical Context

The APX809-46SAG-7 integrates a precision voltage comparator with internal reference and a fixed 200 ms reset timeout timer. Its reset assertion logic is triggered when VCC falls below 4.54–4.72 V (min/max over temperature), and RESET remains low for ≥240 ms after VCC recovers above threshold.

Designed for single-supply monitoring, it features push-pull output capable of sinking 1.2 mA at VOL ≤ 0.3 V (VCC = VTH − 0.2 V), operates across −40°C to +85°C ambient, and maintains valid reset state down to VCC = 1 V - enabling robust behavior during deep brownouts.

Key Specifications

Pinout & Package

SOT23-3 (SA package) surface-mount package with 2.4 mm × 1.3 mm footprint, 0.95 mm height, and lead-free "Green" molding compound compliant with RoHS, halogen-free, and antimony-free standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G33DBVR, the APX809-46SAG-7 offers optimal balance of precision 5 V rail monitoring, guaranteed 240 ms minimum timeout, and SOT23-3 simplicity - making it preferred for cost-sensitive, space-constrained industrial and portable applications where fixed-function reset supervision suffices.

Availability

APX809-46SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for APX809-46SAG-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 APX809/810 series was designed specifically for cost-effective, single-function microprocessor reset supervision in space-constrained embedded systems - emphasizing precision threshold accuracy, minimal external components, and wide-temperature operation.

FAQ

Is APX809-46SAG-7 pin-compatible with APX809-46SAK-7?

No. APX809-46SAG-7 uses the SA (SOT23-3) package with green molding compound, while APX809-46SAK-7 is obsolete and used a different die variant with non-identical thermal resistance and ESD performance. The SA and SR packages share identical pinout but differ in leadframe geometry and moisture sensitivity level - SA is recommended for new designs.

Can APX809-46SAG-7 monitor a 3.3 V supply?

No. Its 4.63 V reset threshold is optimized for 5 V systems. Monitoring 3.3 V rails requires APX809-31SAG-7 (3.08 V threshold) or APX809-29SAG-7 (2.93 V). Using the -46 variant on 3.3 V would result in permanent reset assertion since VCC never reaches the threshold.

Does APX809-46SAG-7 require an external capacitor on the RESET pin?

No. The device has an internal timer and push-pull output - no external capacitor is needed for reset timing. A 100 nF bypass capacitor on VCC is recommended per datasheet, but RESET pin is directly compatible with standard CMOS inputs without pull-up or filtering components.

What is the maximum sink current capability of the RESET output?

The RESET output can sink up to 1.2 mA while maintaining VOL ≤ 0.3 V at VCC = VTH − 0.2 V, and up to 3.2 mA with VOL ≤ 0.4 V. This supports direct interface with most µP /RESET inputs rated for 1–2 mA sink current without additional buffering.