Diodes Incorporated APX810S-40SA-7

Overview

APX810S-40SA-7 from Diodes Incorporated is a microprocessor supervisory IC with active-high push-pull reset output, precision 4.00 V threshold (±0.06 V), 240 ms minimum reset timeout, 7 µA typical supply current, and guaranteed operation down to VCC = 1.0 V - used for power-on reset and brownout detection in embedded microcontroller systems.

For engineers reviewing the APX810S-40SA-7 datasheet, APX810S-40SA-7 pinout, APX810S-40SA-7 application, or APX810S-40SA-7 equivalent, key selection criteria include reset threshold accuracy, temperature stability (30 ppm/°C), low-voltage validity (1.0 V), push-pull drive capability (500 µA source), and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The APX810S-40SA-7 integrates a precision voltage reference, comparator, and timed reset generator in a single die. Its reset assertion is triggered when VCC falls below 4.00 V (typ.), with hysteresis minimized to avoid chatter during slow supply ramps.

Reset deassertion occurs only after VCC exceeds the threshold by ≥20 mV and remains stable for ≥240 ms (typ.), ensuring reliable microprocessor initialization. The push-pull output eliminates need for external pull-up resistors and supports direct interface to CMOS inputs across 1.8–5.5 V logic families.

Key Specifications

Pinout & Package

APX810S-40SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 1.3 mm × 2.9 mm footprint and 1.1 mm height - optimized for automated placement and reflow soldering on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX809SEUR+T, APX810S-40SA-7 uniquely combines 4.0 V precision threshold, push-pull active-high output, and ultra-low 7 µA supply current - making it optimal for compact, battery-sensitive 5 V systems requiring self-contained reset assertion without external components.

Availability

APX810S-40SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX810S-40SA-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 automotive markets.

The APX809S/810S series belongs to Diodes' voltage supervisor product line, designed specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precision thresholds, low IQ, and robust thermal performance.

FAQ

What is the exact reset threshold voltage for APX810S-40SA-7?

The APX810S-40SA-7 has a nominal reset threshold of 4.00 V, with guaranteed min/max values of 3.94 V and 4.05 V at +25°C. Over the full −40°C to +125°C operating range, the threshold varies by ≤±0.012 V due to its 30 ppm/°C temperature coefficient.

Does APX810S-40SA-7 require an external pull-up resistor?

No. APX810S-40SA-7 features a push-pull output stage that actively drives both high and low states. It sources up to 500 µA at 0.8×VCC and sinks up to 1.2 mA at 0.3 V, eliminating the need for external pull-up components and reducing board area and BOM cost.

Can APX810S-40SA-7 operate with a 1.8 V supply rail?

No. While the device guarantees valid reset assertion down to VCC = 1.0 V, its 4.00 V threshold is intended for monitoring 5 V or regulated 4.x V rails. Using it on a 1.8 V rail would prevent threshold crossing and render reset functionality inoperative.

What is the meaning of "SA" in APX810S-40SA-7?

"SA" denotes the SOT23-3 package variant with standard pinout (VCC on pin 3, RESET on pin 2, GND on pin 1). This differs from "SR", which uses reversed pinout (VCC on pin 3, GND on pin 2, RESET on pin 1) - SA is the industry-standard configuration used in most reference designs.