Diodes Incorporated AH49FZ3-G1

Overview

AH49FZ3-G1 from Diodes Incorporated is a linear Hall effect sensor IC in TO92S (Type A) package, delivering proportional analog voltage output (2.5 V ±0.25 V at B=0 G) with 2.1 mV/G sensitivity, ±500 G linear magnetic range, and operation from 3 V to 8 V supply. It serves as a contactless magnetic field transducer in position, liquid level, and motor control systems requiring stable analog feedback under industrial temperature conditions (-40°C to +105°C).

For engineers reviewing the AH49FZ3-G1 datasheet, AH49FZ3-G1 pinout, AH49FZ3-G1 application, or AH49FZ3-G1 equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for magnetic sensing designs where quiescent output stability, low-noise analog output, and high ESD tolerance (6 kV HBM) are critical selection criteria.

Technical Context

The AH49FZ3-G1 integrates a Hall plate, low-noise amplifier, and precision resistor network to deliver ratiometric linear output voltage directly proportional to applied magnetic flux density. Its internal architecture eliminates need for external filtering due to <90 µV RMS noise (10 Hz–10 kHz bandwidth) and maintains ±0.7% linearity over ±500 G range.

It operates with single-supply voltage (3–8 V), draws only 3 mA typical at 5 V, and features polarity-agnostic response: south pole approaching the marked surface increases output voltage, north pole decreases it - consistent across TO92S (Type A), TO92S (Type CJ), and U-DFN2020-6 packages (SC59 exhibits inverted polarity response).

Key Specifications

Pinout & Package

Package: TO92S (Type A), 3-pin through-hole plastic package with 1.27 mm lead pitch, 4.0–4.2 mm body width, and 13.5–14.5 mm lead length. Marking surface faces upward in standard mounting orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall effect sensor applications.

Compared with AH49FZ3-G1, A1302 offers superior temperature range but reduced surge tolerance, while US5881 provides input flexibility at the cost of magnetic sensitivity and linearity - making AH49FZ3-G1 optimal for industrial 5 V systems demanding balanced performance, noise immunity, and ruggedness.

Availability

AH49FZ3-G1 is available at Aetrix Electronics and suitable for position sensing, liquid level monitoring, and motor control applications requiring stable component supply, RoHS-compliant packaging, and industrial temperature qualification.

Supply support for AH49FZ3-G1 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 company specializing in discrete, analog, and mixed-signal ICs, with design centers in Asia, Europe, and the U.S., and manufacturing in China, Taiwan, and Malaysia.

The AH49F series belongs to Diodes' linear Hall effect sensor product line, engineered for high-accuracy, low-noise analog magnetic field measurement in commercial, industrial, and automotive-adjacent applications where reliability and temperature stability are essential.

FAQ

What is the correct pin 1 orientation for AH49FZ3-G1 in TO92S (Type A) package?

Pin 1 (VCC) is located at the leftmost lead when viewing the part marking surface (with "49FG" text visible) and leads pointing downward. The standard TO92S (Type A) pinout is: Pin 1 = VCC, Pin 2 = GND, Pin 3 = OUT - confirmed by Diodes' DS36518 Rev. 4-2, page 2 and package outline drawing on page 9.

Can AH49FZ3-G1 operate from a 12 V supply?

No - the absolute maximum supply voltage is 10 V DC, and recommended operating range is 3 V to 8 V. Applying 12 V will exceed Absolute Maximum Ratings and may cause permanent damage. For 12 V systems, use external regulation to 5 V or 8 V, or select alternatives like US5881 with integrated 24 V input capability.

Does AH49FZ3-G1 require external filtering capacitors?

No - its internal low-noise design achieves 90 µV RMS output noise (10 Hz–10 kHz) without external filtering. A 0.1 µF ceramic capacitor between VCC and GND is still recommended for supply decoupling, but no RC network is needed at the OUT pin for typical 10 kΩ+ ADC loads.

How does magnetic polarity response differ between AH49FZ3-G1 and AH49FNTR-G1 (SC59 package)?

AH49FZ3-G1 (TO92S Type A) outputs higher voltage for south pole approaching the marked surface. AH49FNTR-G1 (SC59) exhibits reversed polarity due to flipped die orientation: south pole on its marked surface produces lower output voltage. This is documented in DS36518 Rev. 4-2, page 4, and must be accounted for in firmware or mechanical layout.