Diodes Incorporated AH1388-HK4-7

Overview

AH1388-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 12μA 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 AH1388-HK4-7 datasheet, AH1388-HK4-7 pinout, AH1388-HK4-7 application, or AH1388-HK4-7 equivalent, key selection considerations include magnetic operate/release thresholds (±17G/±11G), micropower sleep mode (0.36μA), dual open-drain outputs with internal pull-up capability, chopper-stabilized architecture for drift suppression, and −40°C to +85°C operating range.

Technical Context

The AH1388 integrates two monolithic unipolar Hall switches sharing a single chopper-stabilized amplifier and sleep/wake controller. Each output responds exclusively to one magnetic polarity: Output1 activates when perpendicular flux density falls below BOPN (−17G typ.), latching low until BRPN (−11G typ.) is exceeded; Output2 activates when flux rises above BOPS (+17G typ.), releasing at BRPS (+11G typ.).

Hysteresis of 6G (|BOPX| − |BRPX|) ensures noise-immune switching, while the 30–80μs awake time and 1.4–5.6ms sampling period support low-duty-cycle operation. Internal offset cancellation and temperature-compensated design deliver <0.1% typical switch-point drift over −40°C to +85°C.

Key Specifications

Pinout & Package

The AH1388-HK4-7 is housed in a lead-free, RoHS-compliant X2-DFN1410-4 package with an exposed thermal pad. Pin 1 (VDD) is located at the top-left corner when viewing the part marking surface; the center pad is electrically isolated and may be left floating or connected to GND for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with US5781 and A1174LUA-T, the AH1388-HK4-7 uniquely delivers true dual-pole discrimination, integrated pull-ups, and micropower sleep in a single 1.0×1.4mm package - making it the only solution for compact, battery-operated systems requiring independent North/South state reporting without external components.

Availability

AH1388-HK4-7 is available at Aetrix Electronics and suitable for smart cover detection, camera lens positioning, appliance door interlocks, and gaming console hatch sensing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AH1388-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 analog ICs, serving automotive, industrial, computing, and consumer markets with high-reliability, energy-efficient solutions.

The AH1388 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, dual-polarity position sensing in space-constrained portable and battery-powered equipment.

FAQ

What is the recommended bypass capacitor value for AH1388-HK4-7?

A 100nF ceramic capacitor is required between VDD and GND, placed as close as possible to the device pins. This stabilizes the supply during wake cycles and improves RF noise immunity, as specified in the Typical Applications Circuit. Larger values (>1μF) are not recommended due to potential startup timing violations.

Can AH1388-HK4-7 detect both magnetic poles simultaneously?

Yes - Output1 activates independently when a North pole exceeds BOPN (−17G typ.), and Output2 activates independently when a South pole exceeds BOPS (+17G typ.). Both outputs can be active concurrently if opposing poles are present, enabling three-state sensing (e.g., open, closed, misaligned) in mechanical assemblies.

Is the exposed thermal pad on X2-DFN1410-4 required to connect to GND?

No - the center exposed pad is electrically isolated and has no internal connection. It may be left floating or soldered to a GND copper pour solely for thermal dissipation. No electrical function is affected either way, and no voltage or current rating applies to the pad.

What is the minimum magnetic field strength needed to reliably trigger AH1388-HK4-7 across temperature?

Over −40°C to +85°C, the guaranteed operate points are BOPN = −25G (North) and BOPS = +6G (South). Reliable triggering requires ≥25G magnitude for North and ≥6G for South poles at worst-case temperature and voltage (1.6V), per the Recommended Operating Conditions table.