Diodes Incorporated ATS177-PL-B-B

Overview

ATS177-PL-B-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 output sink current, and open-collector DO output. It integrates on-chip Hall generator, amplifier, Schmitt trigger, and bandgap regulator for noise-immune magnetic switching in fan and motor control.

For engineers reviewing the ATS177-PL-B-B datasheet, ATS177-PL-B-B pinout, ATS177-PL-B-B application, or ATS177-PL-B-B equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), temperature-compensated supply regulation, SIP-3L package thermal derating, and bipolar latching behavior with hysteresis.

Technical Context

The ATS177 implements a monolithic Hall-effect latch with built-in hysteresis (≥80 Gauss) via Schmitt-triggered comparator, enabling robust magnetic state retention without external components. Its bandgap-regulated internal supply ensures stable operation across 3.5–20 V input while maintaining consistent Bop/Brp thresholds over temperature.

Magnetic sensing occurs at the branded surface of the SIP-3L package, with active area depth optimized for proximity detection in rotating assemblies. Output switching is unidirectional: DO pulls low when south-pole flux exceeds Bop (≤70 Gauss for Grade A, ≤100 Gauss for Grade B), and remains latched until reverse flux falls below Brp (≥5 Gauss negative for Grade A, ≥100 Gauss negative for Grade B).

Key Specifications

Pinout & Package

SIP-3L (Single In-line Package, 3-pin, straight lead, bulk packaging) with 2.00 mm ±0.10 mm body width, 1.15 mm ±0.10 mm height, and 0.51 mm nominal active area depth. Branded surface indicates magnetic sensing side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATS177-PL-B-B, A3291LUA-T offers extended thermal margin but lacks reverse polarity protection; US1881EUA-ABA-002-SP supports lower voltage operation and tighter Bop tolerance but requires external pull-up resistor optimization for 24 V systems.

Availability

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

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

The ATS177 belongs to Diodes' Hall-effect sensor product line, designed specifically for cost-sensitive, high-reliability rotor position and speed sensing in brushless DC motors and fans.

FAQ

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

The ATS177-PL-B-B activates (DO pulls low) when a south magnetic pole approaches the branded surface with flux density exceeding Bop (≤100 Gauss for Grade B). It releases (DO goes high-impedance) only when the field reverses polarity and falls below Brp (≥100 Gauss negative). North-pole-only or unipolar operation is not supported.

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

No - ATS177-PL-B-B's open-collector DO output sinks only 25 mA maximum and lacks voltage translation. It is intended to drive the base of an NPN transistor (e.g., Q1/Q2 in the typical application circuit) or interface with a logic-level input. Direct MOSFET gate driving requires external level-shifting and higher-current buffer stages.

How does the SIP-3L package affect thermal performance in continuous operation?

The SIP-3L package has a maximum power dissipation of 550 mW at 25°C, derating linearly to zero at 150°C junction temperature. At 85°C ambient, usable power drops to ~286 mW. PCB copper area under the pad and airflow must be designed to maintain TJ <125°C, especially when sinking 20 mA continuously at 20 V supply.

Is ATS177-PL-B-B RoHS-compliant and lead-free?

Yes - the "-PL-" in ATS177-PL-B-B denotes lead-free (Pb-free) construction with green molding compound (no bromine or antimony), compliant with EU Directive 2002/95/EC (RoHS) and all applicable exemptions. The "-B" suffix indicates Grade B magnetic characteristics (higher Bop/Brp tolerance), not material composition.