Diodes Incorporated AH1815-Z-7

Overview

AH1815-Z-7 from Diodes Incorporated is a low-sensitivity, micropower omnipolar Hall-effect switch IC in SOT553 package, designed for magnetic tamper detection in smart meters and position sensing in battery-powered consumer devices. It operates from 2.5V to 5.5V, consumes only 8–16 µA average supply current at 3V, features ±255–±540 Gauss operating points, and delivers open-drain output switching with either north or south magnetic pole.

For engineers reviewing the AH1815-Z-7 datasheet, AH1815-Z-7 pinout, AH1815-Z-7 application, or AH1815-Z-7 equivalent, key selection criteria include magnetic sensitivity range (Bop/Brp), ultra-low power consumption in sleep mode (≤28 µA over temperature), chopper-stabilized architecture for thermal stability, and SOT553 footprint compatibility with space-constrained PCB layouts.

Technical Context

The AH1815 employs dual Hall plates and chopper-stabilized amplification to cancel offset drift, enabling stable switching thresholds across −40°C to +125°C. Its latch-free architecture supports continuous sampling with 75–125 µs awake time and 75–125 ms period, delivering reliable on/off state transitions without hysteresis-induced chatter.

It integrates sleep/awake logic that reduces average current to ≤40 µA over full temperature and voltage range while maintaining magnetic responsiveness. The open-drain output is rated for 2.5 mA sink current and interfaces directly with standard pull-up resistors (10kΩ–100kΩ) and decoupling capacitors (10nF–100nF).

Key Specifications

Pinout & Package

SOT553 package: 1.2 mm × 1.6 mm × 0.6 mm low-profile surface-mount outline with exposed thermal pad (not electrically connected); pin 1 is NC, pin 2 is GND, pin 3 is NC, pin 4 is VDD, pin 5 is OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1174LUA-T and US1881EUA-ABA-000-SP, AH1815-Z-7 uniquely balances ultra-low power (≤16 µA avg.), wide magnetic tolerance (±255–±540 G), and fully integrated chopper architecture-making it optimal for sealed, maintenance-free, battery-operated industrial sensing where reliability trumps raw sensitivity.

Availability

AH1815-Z-7 is available at Aetrix Electronics and suitable for smart meter tamper detection, portable display control, coffee machine liquid level sensing, and industrial lid/door position monitoring requiring stable component supply across extended product lifecycles.

Supply support for AH1815-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 Malaysia.

AH1815 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, high-reliability magnetic switching in battery-operated and harsh-environment applications such as utility metering and home appliances.

FAQ

What is the maximum recommended supply voltage for continuous operation of AH1815-Z-7?

The absolute maximum VDD rating is 7V, but this is a transient stress limit-not a functional operating condition. Diodes specifies 2.5V to 5.5V as the continuous operating range. Exceeding 5.5V risks accelerated parametric shift and reduced long-term reliability, especially at elevated temperatures.

Can AH1815-Z-7 operate reliably at −40°C with a 2.5V supply?

Yes. Electrical characteristics including Bop/Brp, IDD(Sleep), and tAWAKE are guaranteed over −40°C to +125°C at VDD = 2.5V to 5.5V. At −40°C and 2.5V, typical IDD(Sleep) remains ≤28 µA and Bop stays within ±255–±540 Gauss per datasheet Table 4.

Is the SOT553 package of AH1815-Z-7 thermally adequate for 125°C ambient operation?

Yes. Thermal performance data shows PD = 230 mW at TA = 25°C, decreasing linearly to 0 mW at TA = 150°C. At 125°C ambient, allowable power dissipation is ~55 mW-well above the device's max IDD(Awake) × VDD = 12 µA × 5.5V ≈ 66 µW, confirming safe thermal margin.

Does AH1815-Z-7 require an external capacitor on VDD, and what value is recommended?

Yes. Diodes recommends a 10nF to 100nF ceramic capacitor between VDD and GND, placed as close as possible to the SOT553 pins. This stabilizes the internal regulator, suppresses supply noise, and improves RF immunity-critical for reliable operation near switching power supplies or wireless modules.