Diodes Incorporated AH1892-CD4-7

Overview

AH1892-CD4-7 from Diodes Incorporated is a programmable micropower omnipolar Hall-effect sensor switch IC with dual magnetic sensitivity bands (Bop/Brp), internal pull-up/pull-down, and hibernating clocking architecture. It operates from 1.6V to 3.6V, draws only 4.3µA typical average current at 1.8V, and delivers ±8kV HBM ESD protection on VDD, GND, and OUTPUT pins. Used in cover-detect, holster-detect, and position-sensing applications for battery-powered portable electronics.

For engineers reviewing the AH1892-CD4-7 datasheet, AH1892-CD4-7 pinout, AH1892-CD4-7 application, or AH1892-CD4-7 equivalent, key selection criteria include programmable BSEL-driven band selection (low/high sensitivity), ultra-low quiescent current, CSP package footprint (0.71mm × 0.71mm), guaranteed operation over –40°C to +85°C, and integrated output driver eliminating external pull resistors.

Technical Context

The AH1892 implements a chopper-stabilized Hall sensor with hibernating clocking to achieve micropower operation: it alternates between ultra-low-current sleep mode (2.5µA) and brief awake periods (100µs pulse width, 50–100ms period) for magnetic sampling. Band selection via BSEL pin directly configures two discrete magnetic thresholds without external components.

Omnipolar switching responds to either north or south pole field polarity. Output is open-drain, actively pulled low when |B| > Bop and released when |B| < Brp, with hysteresis of ≥10 Gauss. Internal BSEL pull-up (50kΩ) activates only during awake phase, enabling firmware-controlled sensitivity reconfiguration.

Key Specifications

Pinout & Package

Package: U-WLB0707-4 (0.71mm × 0.71mm chip-scale package), 4-terminal wafer-level ball grid array with solder bumps.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3263LLHLT-T and US5881LUA-ABA-000-REEL, the AH1892-CD4-7 uniquely combines BSEL-programmable sensitivity, 4.3µA ultra-low average current, and 0.71mm CSP packaging - making it the sole option meeting simultaneous requirements for firmware-tunable detection, multi-year coin-cell operation, and sub-1mm² PCB area in portable consumer devices.

Availability

AH1892-CD4-7 is available at Aetrix Electronics and suitable for smartphone cover detect, tablet dock sensing, and printer tray position monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AH1892-CD4-7 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, manufacturing, and sales operations across Asia, Europe, and North America.

The AH1892 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, space-constrained consumer electronics requiring reliable contactless position sensing with minimal bill-of-materials impact.

FAQ

What is the function of the BSEL pin, and how does it affect magnetic sensitivity?

The BSEL pin selects between two factory-trimmed magnetic sensitivity bands: logic low (≤0.5V) enables low-band operation (Bop = ±18–55G), while logic high (≥1.4V) or open-circuit enables high-band operation (Bop = ±43–80G). Band transition completes within 100–200.1ms after BSEL change, and output validity requires two full awake cycles. No external components are needed for configuration.

Can the AH1892-CD4-7 operate reliably at 1.6V supply voltage?

Yes - the AH1892-CD4-7 is fully specified to operate from 1.6V to 3.6V. At 1.6V, electrical characteristics including Bop/Brp, VOL, VOH, and IDD(avg) remain within datasheet limits. The chopper-stabilized core and hibernating clock ensure stable switching performance even at minimum supply, supporting direct connection to single-cell lithium batteries.

Is an external decoupling capacitor required, and what value is recommended?

Yes - a 100nF ceramic capacitor is required between VDD and GND, placed as close as possible to the U-WLB0707-4 package. This stabilizes the internal power rail during wake pulses and enhances RF noise immunity, preventing false triggering in electrically noisy environments such as cellular handsets or motor-driven peripherals.

How does the AH1892-CD4-7 handle temperature variation in magnetic switch points?

The AH1892 uses chopper stabilization to minimize temperature-induced offset drift. Typical switch-point variation is ±10% over –40°C to +85°C, with hysteresis maintained at ≥10 Gauss across temperature. Graphs in the datasheet (DS35092 Rev. 1–2, p.7) confirm stable Bop/Brp tracking versus temperature for both sensitivity bands under 1.8V and 3.6V supply conditions.