Diodes Incorporated ATS137-PG-A-A

Overview

ATS137-PG-A-A from Diodes Incorporated is a single-pole, unipolar Hall-effect switch IC with open-collector output, operating from 3.5V to 20V DC, rated for -20°C to +85°C, delivering up to 25mA sink current, and featuring reverse polarity protection and temperature compensation - used in cover detection, CD/DVD tray sensing, and home appliance door monitoring.

For engineers reviewing the ATS137-PG-A-A datasheet, ATS137-PG-A-A pinout, ATS137-PG-A-A application, or ATS137-PG-A-A equivalent, key selection criteria include magnetic operate/release points (Bop ≤ 100 G, Brp ≥ 10 G), output saturation voltage (≤700 mV at 20 mA), supply current (≤10 mA), and SIP-3L package compatibility with lead-free, RoHS-compliant assembly.

Technical Context

The ATS137 integrates a Hall voltage generator, low-noise amplifier, Schmitt trigger with 80 G hysteresis, and open-collector NPN pre-driver stage - enabling robust contactless switching in noisy environments. Its bandgap-regulated internal supply ensures stable operation across the full 3.5–20 V range without external regulation.

It responds exclusively to south-pole magnetic flux applied to the branded side, with Bop ≤ 100 G and Brp ≥ 10 G (A-grade), and exhibits <0.1 µA output leakage at 14 V - critical for low-power battery-operated cover detectors and safety interlocks.

Key Specifications

Pinout & Package

ATS137-PG-A-A uses the SIP-3L package (3-pin single-inline, spread-lead), RoHS-compliant and green molding compound, with 2.00 mm ±0.10 mm body length and 1.15 mm ±0.10 mm width. Pin 1 is Vcc, Pin 2 is GND, Pin 3 is DO (open-collector digital output).

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-PG-A-A offers optimal balance of wide-voltage operation, SIP-3L mechanical robustness, and A-grade magnetic thresholds - making it preferred for cost-sensitive, high-volume consumer appliance designs where unipolar detection suffices.

Availability

ATS137-PG-A-A is available at Aetrix Electronics and suitable for CD/DVD loader sensing, refrigerator door detection, and microwave oven interlock applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ATS137-PG-A-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 centers across Asia and manufacturing in China, Taiwan, and the Philippines.

ATS137 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-reliability, low-cost contactless switching in consumer electronics, home appliances, and industrial controls - emphasizing robustness, magnetic consistency, and ease of integration.

FAQ

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

The ATS137-PG-A-A activates only when a south magnetic pole is presented to the branded side of the package. It does not respond to north poles or non-branded-side fields. The A-grade version has an operate point ≤100 G and release point ≥10 G, with 80 G hysteresis - ensuring stable switching under vibration or thermal drift.

Can ATS137-PG-A-A drive an LED directly without a current-limiting resistor?

No. While the device sinks up to 25 mA, an external current-limiting resistor is mandatory between Vcc and the LED anode to set forward current. For example, with 12 V supply and 2 V LED drop, a 400 Ω resistor yields ~25 mA. Omitting the resistor risks exceeding the 25 mA absolute maximum and damaging the output transistor.

Is ATS137-PG-A-A compatible with 3.3 V logic systems?

Yes - its open-collector output allows interfacing with 3.3 V logic by using a 3.3 V pull-up resistor on the DO line. The device itself requires ≥3.5 V on Vcc, so a separate 3.5–20 V supply (e.g., 5 V or 12 V rail) must power the IC, while the pulled-up DO node remains at 3.3 V logic levels.

Does ATS137-PG-A-A require a bypass capacitor on the Vcc pin?

A 0.1 µF ceramic capacitor between Vcc and GND is recommended within 5 mm of the SIP-3L pins to suppress high-frequency noise from motor loads or switching supplies. Though not strictly mandatory per datasheet, omission increases susceptibility to false triggering in electrically noisy environments like DVD loaders with spindle motors.