Diodes Incorporated AH3327-P-B

Overview

AH3327-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC designed for proximity and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 28V, features open-drain output with 60mA continuous current rating, BOP of 95–140G (typ. 115G), BRP of 70–120G (typ. 90G), and operates across –40°C to +125°C.

For engineers reviewing the AH3327-P-B datasheet, AH3327-P-B pinout, AH3327-P-B application, or AH3327-P-B equivalent, key selection criteria include magnetic operate/release thresholds, supply voltage range compatibility, open-drain drive capability, thermal derating in SIP-3 bulk packaging, and polarity-dependent mounting orientation for South-pole actuation.

Technical Context

The AH3327-P-B uses chopper-stabilized architecture with dynamic offset cancellation to achieve minimal switch-point drift (<±10G over temperature) and superior temperature stability. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, enabling consistent operation across –40°C to +125°C ambient.

It integrates reverse-blocking diode and zener clamps on both VDD and OUTPUT pins for robustness against supply transients and ESD events (8kV HBM). The single open-drain output switches low when perpendicular magnetic flux exceeds BOP (115G typ.), latching until flux drops below BRP (90G typ.), with 25G typical hysteresis for noise immunity.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin, straight-lead, surface-mount package with 2.3mm body width and 0.65mm lead pitch; optimized for automated bulk handling and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3326-P-B, AH3327-P-B delivers higher magnetic sensitivity for compact magnet integration, while AL3327Q-P-B adds automotive reliability at no magnetic performance trade-off-making AH3327-P-B the optimal choice for cost-sensitive, high-volume appliance and industrial sensing where AEC-Q100 is unnecessary.

Availability

AH3327-P-B is available at Aetrix Electronics and suitable for appliance door detection, industrial flow metering, personal care device position sensing, and building automation contactless switching requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3327-P-B 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and automotive markets.

The AH332X series belongs to Diodes' high-voltage Hall-effect switch product line, engineered specifically for robust, maintenance-free position and proximity sensing in harsh environments where reliability and wide supply range are critical.

FAQ

What is the correct magnet polarity and orientation for AH3327-P-B activation?

For the SIP-3 (Bulk Pack) package, a South pole must be presented to the part-marking side of the device. This is confirmed in the datasheet's magnetic polarity diagram and differs from SC59 packages, which require South pole on the non-marking side. Incorrect orientation results in no switching action.

Does AH3327-P-B require an external bypass capacitor?

Yes - a 10nF to 100nF ceramic capacitor (C_IN) between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve RF noise immunity. Omitting it may cause erratic switching under EMI or supply ripple conditions.

Can AH3327-P-B drive an LED directly?

No - while its 60mA continuous output current rating exceeds typical LED requirements, the open-drain output requires an external pull-up resistor to VDD. Direct LED connection would leave the cathode floating during OFF state; proper implementation uses LED anode tied to VDD and cathode to OUTPUT.

How does thermal derating affect AH3327-P-B in SIP-3 Bulk packaging?

In SIP-3 Bulk (P-B), power dissipation drops linearly from 550mW at 25°C to 0mW at 150°C. At 100°C ambient, maximum allowable dissipation is ~198mW - limiting continuous output current to ~45mA at 28V, requiring layout attention to copper area and airflow in sealed enclosures.