Manufacturer Part Number

STWD100YNWWY3F

Description

Single-channel supervisor IC in a compact SOT-23-5 package. Provides an open drain (or open collector) output to monitor voltage levels. Includes a watchdog function to reset the system if it becomes unresponsive. Designed for automotive-grade applications with wide operating temperature range.

Specifications

Monitoring channels: 1 voltage

Output type: Open drain / open collector

Reset signal: Active low

Reset timeout minimum: 5.1 ms

Operating temperature range: -40°C to 125°C

Package: SOT-23-5 (SC-74A / SOT-753)

RoHS status: ROHS3 compliant

Moisture sensitivity level (MSL): 1 (unlimited)

Automotive grade with AEC-Q100 qualification

ECCN: EAR99

HTSUS code: 8542.39.0001

Device Structure

A single integrated circuit monitoring voltage with a built-in watchdog timer and reset output. The device is built using standard CMOS technology within a small surface-mount SOT-23-5 package designed for easy PCB mounting and space saving.

Performance Characteristics

Reliable voltage monitoring with a fixed or factory-set threshold

Open drain/open collector output allows straightforward external reset circuitry

Active low reset output guarantees system reset when voltage or watchdog timer triggers

Reset timeout ensures system stability during brown-out or system lockups

Automotive temperature and qualification ensure robustness in harsh environments

Low power consumption suitable for battery-operated or embedded systems

Application Environments

Automotive electronics systems requiring reliable power supervision

Microcontroller and microprocessor watchdog monitoring

Battery-powered and portable devices needing reliable voltage tracking

Industrial control systems requiring system reset and monitoring

Embedded systems where system uptime and integrity are critical

Selection Guidelines

Choose the STWD100YNWWY3F when you need a compact, single voltage monitor with watchdog capabilities in an automotive-qualified package. Ideal for space-constrained boards needing certified reliability and active reset control. Confirm voltage threshold requirements and reset timeout compatibility with system specs. Consider operating temperature range and RoHS compliance for your application environment.

Usage Considerations

Ensure proper PCB layout to minimize noise on the reset and voltage input pins

Confirm supply voltage matches device specifications to avoid false triggering

Use external pull-up resistor on the open drain reset output as per datasheet recommendations

Verify watchdog timeout and reset timing meet system recovery needs

Follow ESD precautions during handling and assembly to maintain device integrity

Confirm AEC-Q100 qualification matches required automotive quality standards

Potential Equivalent/Replacement Models

Equivalent or alternative models may exist within STMicroelectronics or other vendors, typically supervisor ICs or reset controllers with similar functionality and package types. Examples include:

STWD102 (similar watchdog supervisor with different thresholds or channels)

MAX809, MAX810 series (Maxim Integrated/Analog Devices, comparable reset supervisors)

TPS3839 series (Texas Instruments, similar watchdog and voltage monitoring)

If no direct equivalent fits your exact requirement or if you need specific part compatibility, please contact the Ariat-Tech sales team through our website for tailored assistance.

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