Diodes Incorporated ATS177-PL-A-B

Overview

ATS177-PL-A-B from Diodes Incorporated is a bipolar Hall-effect latch sensor for brushless DC motor commutation, featuring 3.5–20 V operation, -40°C to +125°C operating range, 25 mA max output sink current, and open-collector DO output with built-in reverse polarity protection. It operates by switching low when magnetic flux exceeds B_op (5–70 G), holding state until flux falls below B_rp (-70 to -5 G), enabling reliable rotor position sensing in fan and motor control.

For engineers reviewing the ATS177-PL-A-B datasheet, ATS177-PL-A-B pinout, ATS177-PL-A-B application, or ATS177-PL-A-B equivalent, key selection criteria include magnetic operate/release thresholds (B_op/B_rp), open-collector drive capability, temperature-compensated bandgap regulation, SIP-3L package thermal derating, and RoHS-compliant green molding compound.

Technical Context

The ATS177 integrates a Hall plate, amplifier, Schmitt trigger with hysteresis (≥80 G), and bandgap-regulated internal supply-enabling stable operation across voltage (3.5–20 V) and temperature (-40°C to +125°C). Its bipolar latching behavior requires opposite-polarity magnetic fields to toggle output, eliminating need for external bias magnets in BLDC rotor position detection.

Output stage is open-collector NPN with 300–700 mV saturation voltage at 20 mA, supporting direct interface to NPN pre-driver stages (e.g., Q1/Q2 in typical fan circuit). Reverse polarity protection prevents damage during incorrect supply connection, and leakage current remains <0.1 µA at 14 V.

Key Specifications

Pinout & Package

SIP-3L package: 3-pin single-inline plastic package with straight leads (Bulk pack), 2.00 ±0.10 mm body width, 1.15 ±0.10 mm height, 0.51 mm nominal active area depth, branded surface indicating Hall sensing side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3291LUA-T and US1881EUA, ATS177-PL-A-B offers optimal balance of SIP-3L footprint compatibility, bipolar latching behavior, and 25 mA drive strength for cost-sensitive BLDC fan and motor designs requiring no external components.

Availability

ATS177-PL-A-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, BLDC fan control, revolution counting, and speed measurement applications requiring stable component supply across automotive, industrial, and computing thermal management programs.

Supply support for ATS177-PL-A-B 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 power management, signal integrity, and sensing solutions for industrial, automotive, and consumer markets.

The ATS177 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-cost electronic commutation in brushless DC motors and fans-emphasizing magnetic stability, wide supply range, and integrated protection features.

FAQ

What is the magnetic polarity requirement for ATS177-PL-A-B operation?

The ATS177-PL-A-B is a bipolar latch: it turns ON when a south pole approaches the branded side (B > +5 G), and remains ON until a north pole (B < -5 G) causes turn-OFF. This behavior enables self-commutating rotor position detection without external biasing or polarity correction circuits.

Can ATS177-PL-A-B drive a MOSFET gate directly?

No-it provides open-collector NPN output with 25 mA sink capability and ~0.5 V saturation voltage, designed to drive the base of NPN transistors (e.g., Q1/Q2 in the typical application circuit). For MOSFET gate drive, an additional NPN/PNP pair or dedicated gate driver IC is required to provide sufficient voltage swing and current.

Is ATS177-PL-A-B qualified for automotive under-hood use?

Yes-the device is rated for -40°C to +125°C operating ambient temperature and has been validated for use in BLDC cooling fans and auxiliary pumps. Its SIP-3L package meets JEDEC moisture sensitivity level 1, and the green molding compound complies with RoHS Directive 2002/95/EC exemptions.

How does the internal bandgap regulator affect performance stability?

The integrated bandgap regulator maintains constant internal supply voltage across 3.5–20 V input and -40°C to +125°C temperature, ensuring stable Hall plate sensitivity, comparator offset, and Schmitt trigger thresholds-resulting in minimal drift in B_op and B_rp values over voltage and temperature extremes.