Diodes Incorporated AP1703DWG-7

Overview

AP1703DWG-7 from Diodes Incorporated is a 3-pin active-low microprocessor reset supervisor IC in SC59 package, monitoring +3.08V supply with ±1.5% threshold accuracy, 240ms minimum reset timeout, 20µA typical supply current, and guaranteed reset validity down to VCC = +1V. It provides push-pull RESET output for reliable power-on/brownout detection in embedded microcontroller systems.

For engineers reviewing the AP1703DWG-7 datasheet, AP1703DWG-7 pinout, AP1703DWG-7 application, or AP1703DWG-7 equivalent, key selection criteria include reset threshold tolerance, VCC immunity below 1V, push-pull drive strength, temperature-stable tempco (30 ppm/°C), and compatibility with +3.3V digital systems requiring deterministic reset assertion during supply transients.

Technical Context

The AP1703DWG-7 integrates a precision voltage comparator with internal reference and a 240ms reset timeout timer. Its reset threshold is fixed at 3.08V (±1.5% over temperature), optimized for +3.3V supply monitoring with 100µs setup time and glitch immunity against ≤100mV/100µs VCC transients.

It features push-pull output architecture enabling direct interface to CMOS microprocessor RESET inputs without external pull-up resistors. The device asserts active-low RESET until VCC rises above 3.08V and remains asserted for ≥240ms thereafter, with output valid down to VCC = +1V.

Key Specifications

Pinout & Package

AP1703DWG-7 is housed in a lead-free, green SC59-3L (SOT-23 compatible) surface-mount package with 2.90–3.10 mm body length, 1.50–1.70 mm width, and 1.00–1.30 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX809S23-30, AP1703DWG-7 offers identical threshold and timeout but uses legacy SC59 packaging and lacks ongoing production support; compared with MAX809TRD3, it delivers stronger drive and simpler interface at the cost of higher quiescent current-critical for cost-sensitive industrial controllers where layout simplicity outweighs nanoamp savings.

Availability

AP1703DWG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply despite its "Not Recommended for New Design" status.

Supply support for AP1703DWG-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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and protection applications.

The AP170x series belongs to Diodes' microprocessor supervisory product line, engineered for cost-effective, no-component-required reset generation in resource-constrained embedded systems operating from standard logic supply rails.

FAQ

What is the exact reset threshold voltage for AP1703DWG-7 and how is it marked?

The AP1703DWG-7 has a nominal reset threshold of 3.08V with ±1.5% tolerance over temperature. This value corresponds to the "D" suffix in the part numbering scheme (A=4.63V, B=4.38V, C=4.00V, D=3.08V). The marking code on the SC59 package is "EJ", per Diodes' marking documentation for AP1703DW variants.

Does AP1703DWG-7 require an external pull-up resistor on the RESET pin?

No. AP1703DWG-7 features a push-pull output stage that actively drives both high and low states, eliminating the need for an external pull-up resistor. The RESET pin sources up to 800µA when high and sinks ≥1.2mA when low, enabling direct connection to standard CMOS microprocessor reset inputs.

Can AP1703DWG-7 operate reliably during fast VCC transients?

Yes. The device is designed to ignore negative-going VCC transients ≤100mV in magnitude lasting ≤100µs, as confirmed by Diodes' transient immunity characterization. A 0.1µF ceramic capacitor placed adjacent to the VCC pin further enhances immunity to high-frequency supply noise.

Is AP1703DWG-7 pin-compatible with APX809S23-30?

No. Although both monitor ~3.0V supplies and share SOT-23 footprint compatibility, AP1703DWG-7 uses SC59-3L (mechanically identical to SOT-23 but with different land pattern recommendations per AP02001), while APX809S23-30 is specified for standard SOT-23. Pad layout must follow Diodes' AP02001 document for reliable soldering.