Diodes Incorporated AH1390-HK4-7

Overview

AH1390-HK4-7 from Diodes Incorporated is an ultra-sensitive dual-output unipolar Hall effect switch IC in X2-DFN1410-4 package, designed for pole-discriminative position sensing. It operates from 1.6V to 3.6V, draws only 1.3μA average supply current at 1.85V, and features independent North-pole–activated Output1 (BOPN = −17G typ.) and South-pole–activated Output2 (BOPS = +17G typ.), enabling contactless detection in space-constrained portable electronics.

For engineers reviewing the AH1390-HK4-7 datasheet, AH1390-HK4-7 pinout, AH1390-HK4-7 application, or AH1390-HK4-7 equivalent, key selection criteria include magnetic operate/release thresholds, dual-output polarity independence, micropower sleep mode timing (tAWAKE = 45μs typ., tPERIOD = 45ms typ.), ESD robustness (2kV HBM), and compatibility with low-voltage microcontrollers in battery-powered systems.

Technical Context

The AH1390 integrates two monolithic unipolar Hall switches with chopper-stabilized amplifiers and offset cancellation, delivering stable magnetic switching across −40°C to +85°C. Each output is latched independently: Output1 activates when perpendicular flux density falls below BOPN (−17G typ.) and releases above BRPN (−11G typ.); Output2 activates above BOPS (+17G typ.) and releases below BRPS (+11G typ.).

Sleep/awake logic cycles the device at ~22 Hz (tPERIOD = 45ms typ.), reducing average current to 1.3μA while maintaining 30–80μs awake time for reliable sampling. Internal pull-up capability eliminates external resistors, and the exposed thermal pad is electrically isolated but recommended for GND connection to improve thermal performance.

Key Specifications

Pinout & Package

Package: X2-DFN1410-4 - 1.4mm × 1.0mm, 0.4mm height, low-profile DFN with exposed thermal pad (electrically isolated, recommended tied to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output Hall switch applications.

Compared with AL3320EUST-7 and TMAG5170AHQDBVR, the AH1390-HK4-7 uniquely delivers true dual-output unipolar switching in a micropower, pin-efficient package - eliminating both external logic and host processing overhead for binary pole-discriminative applications.

Availability

AH1390-HK4-7 is available at Aetrix Electronics and suitable for smart cover detection, camera position sensing, and appliance door monitoring requiring stable component supply and long-term manufacturability.

Supply support for AH1390-HK4-7 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 integrated circuits, specializing in high-performance, energy-efficient solutions for consumer, industrial, and automotive markets.

The AH1390 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, dual-threshold magnetic position detection in space- and battery-constrained portable and home appliance systems.

FAQ

What is the minimum detectable magnetic field strength for Output1 activation?

Output1 activates when perpendicular magnetic flux density falls below BOPN = −17G (typical) at 1.85V and +25°C. Over full temperature and voltage range (−40°C to +85°C, 1.6V–3.6V), BOPN is guaranteed between −25G and −6G. This ensures reliable North-pole detection even under worst-case conditions such as cold ambient or low battery voltage.

Can Output1 and Output2 be used simultaneously without interference?

Yes - Output1 and Output2 operate independently with separate magnetic thresholds and internal latching. Their states update synchronously during each 45ms awake cycle, but neither output affects the other's switching behavior. This allows concurrent detection of opposing magnet orientations, e.g., distinguishing "lid fully closed" (South pole) from "lid partially open" (North pole).

Is the exposed thermal pad electrically connected internally?

No - the center exposed pad in the X2-DFN1410-4 package is electrically isolated from all internal circuitry. It may be left floating or soldered to GND for improved thermal dissipation; doing so lowers junction temperature by ~15°C under continuous operation, enhancing long-term reliability without affecting electrical functionality.

Does the AH1390 require an external decoupling capacitor?

Yes - a 100nF ceramic capacitor must be placed as close as possible to the VDD pin to stabilize supply during the 720μA awake-current pulse and suppress RF noise. Omitting it risks erratic output behavior, especially in noisy environments like motor-driven appliances or near wireless transceivers, as confirmed in Diodes' DS42181 Rev. 3 Figure 5.