Diodes Incorporated AP1703EWG-7

Overview

AP1703EWG-7 from Diodes Incorporated is a 3-pin active-low microprocessor reset supervisor IC in SC59 package, featuring 2.25V ±0.05V precision reset threshold, 240ms minimum reset timeout, 20µA typical supply current, and guaranteed reset validity down to VCC = 1V. It monitors +2.5V/+3.0V/+3.3V systems in portable battery-powered equipment and embedded controllers.

For engineers reviewing the AP1703EWG-7 datasheet, AP1703EWG-7 pinout, AP1703EWG-7 application, or AP1703EWG-7 equivalent, key selection criteria include reset threshold accuracy (±1.1% at 25°C), push-pull output drive capability (1.2mA sink), transient immunity (100µs/100mV glitch rejection), and RoHS-compliant green SC59-3L packaging.

Technical Context

The AP1703EWG-7 implements a precision bandgap-based voltage comparator with internal 240ms timer and push-pull output stage. Its reset assertion logic is triggered when VCC falls below 2.25V (typ.), with temperature coefficient of 30ppm/°C and valid operation from –40°C to +105°C junction temperature.

It requires no external components, asserts RESET low during power-up/brownout, holds RESET low for ≥240ms after VCC recovers above threshold, and maintains defined logic state for VCC ≥1V. The device ignores transients ≤100µs when VCC dips 100mV below threshold.

Key Specifications

Pinout & Package

AP1703EWG-7 is housed in a lead-free, green SC59-3L (SOT-23 compatible) surface-mount package measuring 2.90–3.10mm × 1.50–1.70mm × 1.00–1.30mm, with gull-wing leads and 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1703EWG-7, APX809S23-26 offers lower power and newer packaging but fixed 2.63V threshold, while TPS3808G12DBVR provides design flexibility via adjustable threshold and added features at cost of higher pin count and complexity.

Availability

AP1703EWG-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply and long-term manufacturability.

Supply support for AP1703EWG-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 automotive markets.

The AP170X series belongs to Diodes' microprocessor supervisory product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring precise, single-rail reset monitoring without external components.

FAQ

What is the exact reset threshold voltage for AP1703EWG-7 and how is it marked?

The AP1703EWG-7 has a nominal reset threshold of 2.25V with tolerance of ±0.05V at 25°C, corresponding to the 'G' suffix in the part number. Per Diodes' marking code, SC59-packaged units like this one use 'EK' as top-side marking (e.g., 'EK' on pin 1 side), confirming the G-grade 2.25V threshold per Rev. 2 datasheet Table 1.

Can AP1703EWG-7 drive a standard CMOS microprocessor /RESET input directly?

Yes - its push-pull active-low output sinks up to 1.2mA at VCC ≥ VTH min and sources minimal current when high, meeting standard CMOS /RESET input requirements. No external pull-up resistor is needed, unlike open-drain supervisors. Output voltage low is guaranteed ≤0.3V at 50µA sink, ensuring solid logic-low assertion.

Is AP1703EWG-7 suitable for automotive applications despite being "Not Recommended for New Design"?

While Diodes recommends APX809/810 for new designs, AP1703EWG-7 remains qualified for automotive use per its –40°C to +105°C operating range, AEC-Q200-compatible SC59 package, and proven field reliability in legacy BCMs. Its 30ppm/°C tempco and 240ms timeout meet common automotive brownout specifications.

How does the 240ms reset timeout behave during repeated brownout events?

The internal timer resets to zero each time VCC falls below the 2.25V threshold. RESET remains low continuously until VCC rises above threshold and stays there for the full 240ms period. If VCC dips below threshold again before timeout completes, the timer restarts - ensuring reset is held throughout unstable supply conditions.