Diodes Incorporated AH1899S-FS4-7

Overview

AH1899S-FS4-7 from Diodes Incorporated is an ultra-low-voltage, high-sensitivity micropower omnipolar Hall-effect switch IC in X2-DFN1010-4 (Type B) package, operating from 1.1V to 2.0V supply, consuming only 5.1µA average current at 1.2V, with ±30G typical operate point and internal pull-up/pull-down capability-designed for cover-detect and open/close sensing in battery-powered portable electronics.

For engineers reviewing the AH1899S-FS4-7 datasheet, AH1899S-FS4-7 pinout, AH1899S-FS4-7 application, or AH1899S-FS4-7 equivalent, this page delivers verified magnetic thresholds (Bop/Brp), sleep/awake current values, chopper-stabilized temperature stability, NC pin handling guidance, and real-world use cases in cellular phone hinge detection and tablet cover switches.

Technical Context

The AH1899S-FS4-7 implements a chopper-stabilized Hall sensor with integrated latch and output driver, enabling stable switching across -40°C to +85°C without external components. Its hibernating clocking system alternates between awake periods (45–90µs) and sleep intervals (5.6–11ms), achieving sub-6µA average supply current at 1.2V.

Omnipolar operation allows activation by either north or south magnetic pole perpendicular to the package marking side, with magnetic hysteresis (Bhy) of 10G typical-ensuring noise-immune, bounce-free switching. The internal pull-up/pull-down eliminates need for external resistors while maintaining VOH = VDD − 0.2V and VOL = 0.2V at 0.5mA load.

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.39mm height, lead-free, halogen-free surface-mount package with exposed thermal pad (not electrically connected). Pin 3 is NC (no internal connection) and may be left floating or tied to GND for mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL33201ELTTR and TMAG5170AHQDBVR, the AH1899S-FS4-7 uniquely combines 1.1V operation, 5.1µA average current, and true omnipolar switching in a 1.0mm² footprint-making it the only viable choice for ultra-low-power, cost-sensitive, mechanically constrained portable cover-detect applications.

Availability

AH1899S-FS4-7 is available at Aetrix Electronics and suitable for clamshell phone detection, tablet cover switching, and digital camera lens cap sensing requiring stable component supply, consistent parametric performance across production lots, and full traceability from Diodes Incorporated's IATF 16949-certified facility.

Supply support for AH1899S-FS4-7 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 ASE, J-Devices, and its own facilities.

The AH1899S belongs to Diodes' ultra-low-power Hall-effect switch product line, engineered specifically for battery-operated portable electronics where sub-6µA quiescent current, 1.1V minimum operation, and mechanical simplicity are primary design drivers.

FAQ

What is the maximum recommended supply voltage for continuous operation of AH1899S-FS4-7?

The absolute maximum VDD rating is 2.2V, but this is a transient stress limit-not a functional operating condition. For reliable continuous operation, Diodes specifies 1.1V to 2.0V per the Recommended Operating Conditions table. Exceeding 2.0V risks accelerated parametric shift and reduced long-term reliability, especially at elevated temperatures.

Can Pin 3 (NC) be used as a thermal pad or grounded for improved heat dissipation?

No-Pin 3 is internally unconnected and not bonded to the die or thermal slug. It serves no electrical or thermal function. Grounding it provides no thermal benefit and may introduce solder bridging risk. The X2-DFN1010-4 (Type B) package relies on the exposed copper pad (center thermal pad, not pin 3) for thermal conduction, which must be soldered to a PCB thermal plane per Diodes' suggested pad layout.

How does the chopper stabilization affect magnetic sensitivity accuracy over temperature?

Chopper stabilization actively cancels offset voltage drift in the Hall amplifier, limiting Bop/Brp variation to ±3G over -40°C to +85°C (per DS46195 Figure 6). This ensures consistent magnetic actuation thresholds across environmental extremes-critical for consumer devices shipped globally and operated in uncontrolled ambient conditions.

Is an external capacitor (CIN) mandatory for stable operation?

Yes-Diodes specifies a 10nF to 100nF ceramic capacitor between VDD and GND, placed as close as possible to Pins 1 and 2. This stabilizes the internal regulator during wake cycles and suppresses RF noise coupling into the Hall plate. Omitting CIN increases susceptibility to false triggering from GSM bursts or nearby DC-DC converters, as confirmed in EMI testing per IEC 61000-4-3.