Diodes Incorporated AP1701CWG-7

Overview

AP1701CWG-7 from Diodes Incorporated is a 3-pin active-low microprocessor reset supervisor IC in SC59 package, featuring 4.00V precision reset threshold, 240ms minimum reset timeout, 20µA typical supply current, and guaranteed reset validity down to VCC = +1V. It monitors +3.3V digital systems and asserts a push-pull RESET signal during power-up, brownout, or voltage sag to ensure reliable µP initialization in embedded controllers and portable equipment.

For engineers reviewing the AP1701CWG-7 datasheet, AP1701CWG-7 pinout, AP1701CWG-7 application, or AP1701CWG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), transient immunity against sub-100µs VCC glitches, push-pull output drive capability (1.2mA sink), and compatibility with low-voltage operation down to 1V - critical for battery-backed and automotive-grade power monitoring designs.

Technical Context

The AP1701CWG-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco and internal 240ms delay timer. Its reset assertion logic is triggered only when VCC falls below 4.00V (typ.), and remains asserted for ≥240ms after VCC rises above threshold - independent of input slew rate.

It uses a push-pull output stage (no external pull-up required) with VOL ≤ 0.3V at 1.2mA sink and VOH ≥ 0.8VCC at 500µA source. The device ignores transients ≤100µs wide and ≥100mV deep below threshold, ensuring glitch immunity without false resets in noisy power rails.

Key Specifications

Pinout & Package

AP1701CWG-7 is housed in a lead-free, green SC59-3L (SOT-23 compatible) surface-mount package with 2.90–3.10mm body length, 1.50–1.70mm width, and 1.00–1.30mm height. Pin 1 = GND, Pin 2 = VCC, Pin 3 = RESET (active-low push-pull).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1701CWG-7, APX809S24-7 offers lifecycle support and tighter initial threshold tolerance (±0.5%), while TPS3808G12DBVR trades fixed-threshold simplicity for flexibility and ultra-low power - making AP1701CWG-7 optimal for cost-sensitive, high-volume 3.3V reset applications where legacy compatibility is acceptable.

Availability

AP1701CWG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply and proven field reliability.

Supply support for AP1701CWG-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 AP170x family belongs to Diodes' microprocessor supervisory product line, designed specifically for cost-effective, single-function reset generation in space-constrained embedded systems with strict power and timing requirements.

FAQ

What is the exact reset threshold voltage for AP1701CWG-7, and how does it vary with temperature?

The AP1701CWG-7 has a nominal reset threshold of 4.00V (typ.), with a guaranteed range of 3.92V to 4.08V at 25°C. Over the full industrial temperature range (–40°C to +105°C), the threshold drift is limited to ±1.5% due to a 30 ppm/°C tempco - meaning worst-case variation is approximately ±0.06V across temperature, ensuring consistent brownout detection in 3.3V systems.

Can AP1701CWG-7 drive a 10kΩ pull-down load on its RESET pin?

No - AP1701CWG-7 features a push-pull output and does not require or support external pull-down resistors. Its RESET pin actively drives low (≤0.3V at 1.2mA sink) and high (≥0.8VCC at 500µA source). Adding a pull-down would conflict with the internal driver and may cause excessive current draw or logic contention during high-state assertion.

Is AP1701CWG-7 pin-compatible with AP1701ASA?

Yes - both AP1701CWG-7 (SC59-3L) and AP1701ASA (SOT23) share identical 3-pin pinout: Pin 1 = GND, Pin 2 = VCC, Pin 3 = RESET. Though SC59 and SOT23 have minor dimensional differences (SC59 body is slightly longer), their pad layouts are compatible per Diodes' AP02001 guideline, enabling drop-in replacement on properly designed footprints.

Why is AP1701CWG-7 marked "Not Recommended for New Design"?

Diodes Incorporated designated the AP170x series as "Not Recommended for New Design" in January 2007 due to the introduction of the enhanced APX809/810 family, which offers improved threshold accuracy (±0.5%), lower IQ (1.6µA), and active lifecycle support. AP1701CWG-7 remains fully functional and available for legacy design refresh, repair, and cost-sensitive production where qualification timelines preclude redesign.