Analog Devices Inc./Maxim Integrated ICL7665AESA+T

Overview

ICL7665AESA+T from Maxim Integrated is a dual over/undervoltage supervisor IC with precision internal 1.3V bandgap reference, two independent comparators, and open-drain N-channel OUT1/OUT2 plus open-drain P-channel HYS1/HYS2 outputs. It operates from 2.0V to 16V supply, draws 2.6µA typical quiescent current at 9V, features 2% VSET1 threshold accuracy at +25°C, and supports externally programmable trip points down to 1.3V for battery-backed microprocessor monitoring.

For engineers reviewing the ICL7665AESA+T datasheet, ICL7665AESA+T pinout, ICL7665AESA+T application, or ICL7665AESA+T equivalent, this device serves as a low-power, temperature-stable voltage monitor for brownout detection, power-fail warning, and battery switchover in space-constrained industrial and portable systems requiring precise dual-threshold supervision without external references.

Technical Context

The ICL7665AESA+T integrates a 1.3V bandgap reference with two high-impedance comparators (input bias <10nA), enabling resistor-programmable trip points via SET1/SET2 pins. Its dual-output architecture delivers independent inverting (OUT1) and noninverting (OUT2, HYS1, HYS2) signals with hysteresis controlled by external resistors connected to HYST1/HYST2.

It employs monolithic low-power CMOS design with SCR-latchup mitigation features, operates across –40°C to +85°C, and maintains 100ppm/°C VSET tempco. The 75µs typical propagation delay and 12pF load drive capability support fast, noise-immune voltage fault response in single- and multi-rail systems.

Key Specifications

Pinout & Package

ICL7665AESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with 1.27mm pitch and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold voltage monitoring applications.

Compared with TLV809E33DBZR and MAX6326UT46D3+, the ICL7665AESA+T uniquely supports resistor-programmable thresholds from 1.3V upward, integrated hysteresis control, and true dual independent detection - making it irreplaceable in adaptive battery management and multi-rail fault monitoring where flexibility and low IQ are critical.

Availability

ICL7665AESA+T is available at Aetrix Electronics and suitable for battery backup switchover, power-fail warning, and multi-rail power monitoring requiring stable component supply across industrial, medical, and portable electronics programs.

Supply support for ICL7665AESA+T 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The ICL7665AESA+T belongs to Maxim's voltage supervisor product line, engineered specifically for ultra-low-power, dual-threshold monitoring in battery-critical and fault-tolerant systems where accuracy, hysteresis control, and wide supply range are mandatory.

FAQ

What is the guaranteed VSET1 threshold accuracy of the ICL7665AESA+T over temperature?

The ICL7665AESA+T guarantees ±2.5% VSET1 threshold accuracy across its full operating temperature range of –40°C to +85°C, with ±2% accuracy specified at +25°C. This is achieved through trimmed bandgap reference and comparator offset compensation, ensuring reliable overvoltage detection even in thermally unstable enclosures. The ICL7665AESA+T maintains this performance without external calibration components.

Can the ICL7665AESA+T monitor voltages higher than its 16V supply rail?

Yes - the ICL7665AESA+T can monitor input voltages significantly above its V+ supply via resistor dividers connected to SET1 and SET2. Its input structure tolerates voltages up to several hundred volts when properly scaled, as confirmed by Maxim's Typical Operating Circuit examples. The ICL7665AESA+T's 1.3V internal reference and <10nA input bias enable high-impedance division without loading error, making it suitable for high-side monitoring in telecom or industrial power systems.

How does the hysteresis function work on the ICL7665AESA+T?

The ICL7665AESA+T implements hysteresis using dedicated HYST1 and HYST2 outputs - open-drain P-channel current sources tied to V+. When a comparator trips, its corresponding HYST pin pulls current from V+, shifting the effective divider ratio at SETx to create a lower (for undervoltage) or higher (for overvoltage) recovery threshold. This eliminates oscillation near trip points without external components. The ICL7665AESA+T's hysteresis is fully configurable via external resistors and independent per channel.

Is the ICL7665AESA+T pin-compatible with earlier ICL7665 variants?

Yes - the ICL7665AESA+T shares identical 8-pin SO packaging, pinout, and electrical interface with all ICL7665xSA variants (e.g., ICL7665CSA, ICL7665BCSA). The "A" suffix denotes improved VSET1 accuracy and guaranteed temperature performance, but no changes to pin function, timing, or drive strength. System-level replacement of ICL7665CSA with ICL7665AESA+T requires no PCB or firmware modifications.

What is the maximum sink current capability of the OUT1 and OUT2 pins on the ICL7665AESA+T?

The OUT1 and OUT2 pins of the ICL7665AESA+T can each sink up to 25mA continuously, verified per Absolute Maximum Ratings. At 5V supply and 2mA load, typical saturation voltage is 0.10V - well below TTL VOH requirements. This allows direct driving of LEDs, small relays, or microcontroller interrupt inputs without external buffers. The ICL7665AESA+T maintains this capability across its full –40°C to +85°C temperature range.