Diodes Incorporated ATS137-WL-7-A

Overview

ATS137-WL-7-A from Diodes Incorporated is a single-pole, unipolar Hall-effect switch IC in SC59-3L (SOT-23) package, designed for contactless position and proximity sensing. It operates from 3.5V to 20V, delivers 25mA sinking output current, features reverse polarity protection, temperature compensation, and open-collector output - enabling reliable detection in CD/DVD tray status and appliance door sensors.

For engineers reviewing the ATS137-WL-7-A datasheet, ATS137-WL-7-A pinout, ATS137-WL-7-A application, or ATS137-WL-7-A equivalent, key selection criteria include magnetic operate/release points (≤100 G / ≥10 G), output saturation voltage (≤700 mV at 20 mA), supply current (≤10 mA), operating temperature range (–20°C to +85°C), and SC59-3L thermal derating profile.

Technical Context

The ATS137 integrates a Hall plate, chopper-stabilized amplifier, Schmitt trigger with built-in hysteresis (≥80 G), and open-collector NPN pre-driver stage. Its bandgap-regulated architecture enables stable operation across 3.5V–20V supply while maintaining consistent magnetic thresholds over temperature.

It responds exclusively to south-pole magnetic flux applied to the branded surface, switching low when B ≥ B_op (≤100 G) and releasing high when B ≤ B_rp (≥10 G). No external biasing or timing components are required - only a pull-up resistor on DO.

Key Specifications

Pinout & Package

ATS137-WL-7-A uses the SC59-3L (SOT-23) package: 3-pin, surface-mount, lead-free, green molding compound. Dimensions: 2.90–3.10 mm × 1.30–1.70 mm × 1.00–1.30 mm (L×W×H), with 0.95 mm pin pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect switch applications.

Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, ATS137-WL-7-A uniquely combines reverse polarity tolerance, factory-compensated magnetic thresholds, and SC59-3L thermal performance up to 85°C - making it optimal for cost-sensitive, high-volume appliance designs requiring field-reliable contactless sensing.

Availability

ATS137-WL-7-A is available at Aetrix Electronics and suitable for CD/DVD tray detection, home appliance cover sensing, and smart home safety monitoring requiring stable component supply across multi-year production cycles.

Supply support for ATS137-WL-7-A 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, cost-optimized solutions for consumer, industrial, and computing markets.

The ATS137 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free contactless switching in electromechanical interfaces - prioritizing magnetic stability, wide supply tolerance, and SMT manufacturability.

FAQ

What is the magnetic polarity sensitivity of ATS137-WL-7-A?

The ATS137-WL-7-A responds only to south-pole magnetic flux applied to its branded surface. It activates when flux density exceeds the operate point (B_op ≤ 100 G) and deactivates when flux falls below the release point (B_rp ≥ 10 G). North-pole exposure produces no switching action.

Can ATS137-WL-7-A drive an LED directly?

Yes - its 25mA maximum sink current supports direct LED drive with appropriate current-limiting resistor. For example, with V_CC = 5V and red LED V_F = 1.8V, a 120Ω resistor limits current to ~25mA while maintaining V_CE(SAT) < 700mV.

Is external capacitor filtering required on V_CC?

No external capacitor is mandatory, but a 0.1µF ceramic capacitor placed within 2mm of the V_CC and GND pins is recommended to suppress high-frequency noise from nearby switching circuits and ensure stable Schmitt trigger operation.

How does the SC59-3L package affect thermal performance?

The SC59-3L package has a maximum power dissipation of 230mW at 25°C, derating linearly to 0mW at 150°C. At 85°C ambient, usable dissipation is ~120mW - sufficient for 25mA sink at ≤5V drop, but requires board-level copper pour for higher-power continuous operation.