Diodes Incorporated AH1895-Z-7

Overview

AH1895-Z-7 from Diodes Incorporated is a medium-sensitivity, micropower omnipolar Hall-effect switch IC in SOT553 package, operating from 1.6V to 3.6V supply with 4.3µA average current at 1.85V. It activates on either north or south magnetic pole, delivers open-drain output (pulled low when active), and features chopper stabilization for thermal stability and stress immunity-used in cover-detect and position-sensing functions in portable electronics.

For engineers reviewing the AH1895-Z-7 datasheet, AH1895-Z-7 pinout, AH1895-Z-7 application, or AH1895-Z-7 equivalent, key selection factors include its 60G typical operate point, -40°C to +85°C temperature range, 8kV HBM ESD rating, no external pull-up requirement, and dual-package availability (SOT553/X1-DFN1216-4) for space-constrained PCB layouts.

Technical Context

The AH1895-Z-7 implements a chopper-stabilized Hall sensor with hibernating clocking architecture, enabling ultra-low power operation via periodic wake-up sampling (100ms typical period). Its internal pull-up/pull-down circuitry eliminates external bias components, and magnetic switching thresholds are defined per polarity (Bopn/Bops ≈ ±60G, Brpn/Brps ≈ ±50G) with 10G typical hysteresis.

It operates as a digital proximity detector: output transitions low when perpendicular magnetic flux exceeds Bop, remains latched until flux drops below Brp, and stays high (open-drain pulled up externally or internally) in absence of field. The SOT553 variant uses 5-pin configuration with three NC pins, grounding flexibility, and optimized thermal resistance for handheld device integration.

Key Specifications

Pinout & Package

Package: SOT553 - 1.6mm × 1.6mm × 0.6mm low-profile surface-mount package with exposed pad for thermal relief and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3263LUA-T and US5881LUA-ABA-000-RE, the AH1895-Z-7 offers optimal balance of ultra-low power (4.3µA), compact SOT553 size, and proven performance in consumer-grade portable systems-making it ideal for cost-sensitive, space-constrained, battery-operated applications where +85°C suffices.

Availability

AH1895-Z-7 is available at Aetrix Electronics and suitable for smartphone cover detection, tablet holster sensing, and portable PC lid-switch applications requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for AH1895-Z-7 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 U.S.

The AH1895 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, high-reliability position and proximity detection in portable and battery-powered consumer electronics.

FAQ

What is the magnetic polarity response of the AH1895-Z-7?

The AH1895-Z-7 is an omnipolar Hall switch: it activates (output low) when exposed to either a sufficient north pole or south pole magnetic field perpendicular to the package top surface. Its operate points are Bopn ≈ –60G (north) and Bops ≈ +60G (south), with release points Brpn ≈ –50G and Brps ≈ +50G-ensuring consistent behavior regardless of magnet orientation.

Does the AH1895-Z-7 require external pull-up resistors?

No. The AH1895-Z-7 integrates internal pull-up and pull-down circuitry, eliminating the need for external bias resistors. Its open-drain OUTPUT pin can be directly connected to a host MCU GPIO with internal pull-up enabled, or used with an external pull-up for voltage-level translation-reducing BOM count and PCB area.

How does the hibernating clock system reduce power consumption?

The hibernating clock system powers the Hall sensor and signal chain only during brief awake periods (~100µs every ~100ms), achieving 4.3µA average current at 1.85V. This duty-cycled operation minimizes active time while retaining fast response (<100µs) upon magnetic event detection-enabling multi-year battery life in always-on sensing roles.

Can the NC pins on the SOT553 package be grounded?

Yes. Pins 2 and 3 of the SOT553 package are No Connection (NC) and not bonded internally. They may be left floating or tied to GND without affecting functionality-common practice to improve mechanical stability, enhance thermal conduction, or reduce EMI susceptibility in high-density layouts.