Diodes Incorporated ATS137-WG-7-A

Overview

ATS137-WG-7-A from Diodes Incorporated is a single-pole, open-collector Hall-effect switch IC designed for contactless position and proximity sensing. It operates from 3.5V to 20V DC, delivers up to 25mA sink current, features built-in temperature compensation and reverse polarity protection, and is housed in a lead-free SC59-3L (SOT-23) package. It is used in cover detection, CD/DVD tray sensing, and home appliance door monitoring.

For engineers reviewing the ATS137-WG-7-A datasheet, ATS137-WG-7-A pinout, ATS137-WG-7-A application, or ATS137-WG-7-A equivalent, key selection considerations include magnetic operate/release points (Bop ≤100 G, Brp ≥10 G), output saturation voltage (≤700 mV at 20 mA), supply current (5–10 mA), operating temperature range (–20°C to +85°C), and SC59-3L thermal derating curve (230 mW at 25°C).

Technical Context

The ATS137 integrates a Hall plate, chopper-stabilized amplifier, Schmitt trigger with 80 G hysteresis, and open-collector NPN pre-driver - enabling robust digital switching under varying temperature and supply conditions. Its bandgap-regulated internal supply ensures stable operation across 3.5V–20V input.

Magnetic actuation is unidirectional (south pole to branded side), with Bop ≤100 G and Brp ≥10 G for Grade A devices. The output remains latched low until flux drops below Brp, rejecting noise via hysteresis and supporting reliable edge detection in mechanical motion interfaces.

Key Specifications

Pinout & Package

ATS137-WG-7-A is packaged in SC59-3L (industry-standard SOT-23), a surface-mount, lead-free, green compound package with 1.90 mm × 2.90 mm footprint and 1.15 mm height. Thermal performance follows the SC59-3L power dissipation curve (230 mW @ 25°C, 0 mW @ 150°C).

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-001-SP, ATS137-WG-7-A offers integrated reverse polarity protection and lower cost for consumer-grade applications where 85°C ambient suffices and open-collector flexibility is preferred.

Availability

ATS137-WG-7-A is available at Aetrix Electronics and suitable for CD/DVD loader detection, home appliance door monitoring, and window/door security sensing requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.

Supply support for ATS137-WG-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The ATS137 belongs to Diodes' Hall-effect sensor product line, engineered specifically for cost-sensitive, high-volume contactless switching in consumer and white-goods applications - emphasizing reliability, ease of integration, and qualification across commercial temperature ranges.

FAQ

What is the magnetic polarity requirement for ATS137-WG-7-A operation?

The ATS137-WG-7-A activates when a south pole approaches the branded side of the package. It is unidirectional and will not respond to north-pole actuation. Magnetic operate point (Bop) is ≤100 G, and release point (Brp) is ≥10 G, with 80 G typical hysteresis - verified per DS31045 Rev. 10 magnetic characterization tables.

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

Yes - with appropriate current-limiting. At VCC = 5 V and assuming 1.8 V LED forward drop, a 120 Ω resistor yields ~26.7 mA sink current, within the 25 mA absolute maximum rating. Derate for ambient temperature using the SC59-3L power dissipation curve; at 70°C ambient, max safe continuous current drops to ~18 mA.

Is ATS137-WG-7-A pin-compatible with other Diodes Hall switches in SC59-3L?

No - while ATS137-WG-7-A uses SC59-3L, its pinout (Vcc–GND–DO) differs from Diodes' dual-output or latching Hall sensors (e.g., AH336Q, which has Vcc–OUT1–OUT2). Always verify functional block diagram and pin assignment per datasheet; no cross-package pin compatibility is guaranteed.

Does ATS137-WG-7-A require an external capacitor on VCC?

No external bypass capacitor is mandated in the datasheet, but a 0.1 µF ceramic capacitor placed near the Vcc pin is strongly recommended to suppress high-frequency noise and stabilize the internal regulator during magnetic transients - consistent with Diodes' AP02001 pad layout guidance for SC59-3L.