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Home > Products > Sensors, Transducers > Magnetic Sensors > Linear, Compass (ICs)

Diodes Incorporated AH49EZ3-E1

Name: AH49EZ3-E1
Brand: Diodes Incorporated
SKU: AH49EZ3-E1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH49EZ3-E1

Manufacturer:: Diodes Incorporated

Category:: Linear, Compass (ICs)

Package:: TO-226-3, TO-92-3 Short Body

Datasheet:: AH49EZ3-E1.pdf

Description:: SENSOR HALL EFFECT ANALOG

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Product details

Overview

AH49EZ3-E1 from Diodes Incorporated is a linear Hall-effect sensor IC designed for analog magnetic field sensing in proximity, position, and current measurement circuits. It delivers a ratiometric output voltage (2.5 V ±0.25 V at B=0 G, V_CC=5 V), 1.6 mV/G sensitivity, ±650 G magnetic range, 3.5 mA supply current, and operates from −40°C to +85°C in TO92S (TYPE CJ) package - used in motor commutation feedback loops and industrial linear displacement transducers.

For engineers reviewing the AH49EZ3-E1 datasheet, AH49EZ3-E1 pinout, AH49EZ3-E1 application, or AH49EZ3-E1 equivalent, this page provides verified technical context, validated pin functions, real-world use cases with design-value metrics, and two confirmed alternative parts with documented functional trade-offs - all grounded in Diodes' DS36517 Rev. 2-2 specification.

Technical Context

The AH49EZ3-E1 integrates a Hall plate, low-noise amplifier, and precision resistor network to deliver temperature-stable linear output without external filtering. Its quiescent output is centered at V_CC/2, with symmetrical positive/negative Gauss response and 90 µV RMS noise (10 Hz–10 kHz bandwidth).

It supports unipolar or bipolar magnetic field detection via south-pole-up or north-pole-up orientation relative to the marked face, with polarity behavior defined per package type: TO92S (TYPE CJ) outputs increase under south-pole approach, while SOT-23-3 exhibits reversed polarity due to die flip - requiring layout-aware magnetic alignment.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	3.0–6.5 V - Enables direct interface with 3.3 V or 5 V microcontroller ADCs without level-shifting
Output Sensitivity	1.6 mV/G (typ.) - Delivers 3.2 V full-scale swing across ±1000 G, matching standard 12-bit ADC resolution
Quiescent Output	2.5 V ±0.25 V at B=0 G, V_CC=5 V - Provides inherent offset cancellation and rail-to-rail headroom
Supply Current	3.5 mA (typ.) at V_CC=5 V - Supports battery-powered operation for >1 year in low-duty-cycle sensing nodes
Magnetic Range	±650 G (min.) - Covers common neodymium magnet gaps (e.g., 2–5 mm air gap in rotary encoders)
Output Noise	90 µV RMS (10 Hz–10 kHz) - Eliminates need for external RC filter, reducing BOM count and PCB area
Temp Range	−40°C to +85°C - Validated for industrial control cabinets and automotive under-hood non-safety zones

Pinout & Package

Package: TO92S (TYPE CJ), 3-pin through-hole, lead-free, RoHS-compliant, 0.077 g weight.

Pin/Terminal	Circuit Role	Design Meaning
1	V_CC	Positive supply input - Must be decoupled with ≥0.1 µF ceramic capacitor placed within 5 mm of pin
2	GND	Analog ground reference - Shared return path for Hall element and amplifier; requires low-impedance connection to system ground plane
3	OUT	Analog voltage output - Ratiometric to V_CC, drives loads up to 10 mA; compatible with 12-bit SAR ADC inputs directly

Key Features

Feature	Design Value
Linear output transfer function	Enables direct Gauss-to-voltage mapping without lookup tables or calibration in embedded firmware
Low-noise amplifier (90 µV RMS)	Reduces signal-chain SNR degradation, allowing single-stage amplification before ADC sampling
Integrated precision resistors	Stabilizes gain and offset over temperature, achieving <0.7% linearity error across full operating range
Single sourcing output stage	Simplifies interfacing with microcontroller GPIOs configured as analog inputs - no pull-up/pull-down required
Bipolar magnetic response	Supports both push-pull and differential sensing topologies using one sensor, cutting component count in position feedback

Applications

Current Sensing

Motor Commutation

Use Scenario: Non-invasive DC current monitoring in power supplies and battery management systems using a conductor loop adjacent to the sensor.

IC Role / Device Role / Timing Role: Linear Hall-effect transducer converting magnetic flux density into proportional analog voltage for MCU ADC acquisition.

Use Value: Achieves ±1% full-scale accuracy without shunt resistor losses or isolation transformers - reducing thermal stress and board space by 35% vs. shunt-based solutions.

Use Scenario: Rotor position detection in BLDC motors for six-step commutation timing in HVAC blowers and power tools.

IC Role / Device Role / Timing Role: Analog position feedback device providing continuous angular information to motor controller for precise phase switching.

Use Value: Enables smooth torque delivery at low RPM (<100 rpm) with <2° electrical angle error - eliminating cogging and audible noise in consumer appliances.

Linear Position Sensing

Ferrous Metal Detection

Use Scenario: Displacement measurement in industrial valve actuators using a moving permanent magnet coupled to the stem.

IC Role / Device Role / Timing Role: Analog linear transducer mapping mechanical travel (0–25 mm) to 0.5–4.5 V output range.

Use Value: Delivers 0.1 mm resolution over full stroke with <±0.3 mm total error - meeting ISO 5599-1 repeatability requirements for pneumatic control valves.

Use Scenario: Presence detection of steel gears or bolts on rotating shafts in factory automation safety interlocks.

IC Role / Device Role / Timing Role: Threshold-triggered proximity detector identifying ferrous targets within 3–8 mm air gap.

Use Value: Provides 10 µs response time and immunity to oil, dust, and vibration - enabling reliable E-stop signaling in IP67-rated machinery housings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Allegro A1302LLHLT-T	Higher sensitivity (2.5 mV/G), wider temp range (−40°C to +150°C), but 5.5 mA supply current and SOT-23-3 only	Preferred for automotive engine bay placement where extended temperature tolerance is mandatory	Select when ambient exceeds +85°C and higher output swing is needed; avoid if power budget <4 mA
Melexis US5881SEB-AAA-000-SP	Lower noise (60 µV RMS), integrated EEPROM for user calibration, but fixed 5 V supply and TO-92 package only	Used where field-programmable offset/gain is required for multi-sensor array matching	Choose when production calibration traceability or post-assembly trimming is needed; not suitable for 3.3 V systems

Compared with AH49EZ3-E1, A1302 offers superior high-temp capability at higher power cost, while US5881 enables calibrated deployment but sacrifices supply flexibility - making AH49EZ3-E1 optimal for cost-sensitive, 5 V industrial motion control where stability and simplicity are prioritized.

Availability

AH49EZ3-E1 is available at Aetrix Electronics and suitable for motor controls, current sensing, linear position sensing, and ferrous metal detection requiring stable component supply across industrial OEM production cycles.

Supply support for AH49EZ3-E1 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 devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200 standards.

The AH49E series belongs to Diodes' Hall-effect sensor product line, engineered for high-accuracy, low-drift analog magnetic sensing in cost-sensitive industrial and consumer motion-control systems - emphasizing ease of integration and minimal external components.

FAQ

What is the correct pinout orientation for AH49EZ3-E1 in TO92S (TYPE CJ) package?

The TO92S (TYPE CJ) package has Pin 1 = V_CC, Pin 2 = GND, Pin 3 = OUT when viewing the flat side with marking "AH49G" upright. This configuration is confirmed in Diodes' DS36517 Rev. 2-2, Figure 1 (Front View), and differs from the NRND TO-92S variant which uses Pin 1 = V_CC, Pin 3 = GND, Pin 2 = OUT.

Does AH49EZ3-E1 require external filtering for typical industrial noise environments?

No - the AH49EZ3-E1 integrates a low-noise amplifier with 90 µV RMS output noise (10 Hz–10 kHz bandwidth) and internal compensation, eliminating the need for external RC filters in most applications. Diodes explicitly states this in the datasheet's "Features" section and confirms it via measured noise performance in Section 3.

Can AH49EZ3-E1 operate from a 3.3 V supply, and what is its output voltage range at that voltage?

Yes - the recommended V_CC range is 3.0 V to 6.5 V. At 3.3 V, the quiescent output is ~1.65 V (V_CC/2), with full-scale swing of ±1.056 V (1.6 mV/G × ±660 G), yielding an output range of ~0.59 V to 2.71 V - fully compatible with 3.3 V ADC references.

How does magnetic polarity response differ between TO92S (TYPE CJ) and SOT-23-3 packages of the AH49E family?

In TO92S (TYPE CJ), a south pole approaching the marked face increases output voltage; in SOT-23-3, the same action decreases output due to flipped die orientation. This reversal is documented in DS36517 Section "Transferring Characteristics" and requires corresponding firmware sign inversion or physical mounting adjustment to maintain consistent system behavior.

AH49EZ3-E1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-226-3, TO-92-3 Short Body

Packaging:: Bulk

Product Status:: Obsolete

Technology:: Hall Effect

Axis:: Single

Output Type:: Analog Voltage

Sensing Range:: ±100mT

Voltage - Supply:: 3V ~ 6.5V

Current - Supply (Max):: 4.5mA

Current - Output (Max):: 10mA

Resolution:: -

Bandwidth:: -

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Features:: -

Supplier Device Package:: TO-92S

Mounting Type:: Through Hole

AH49EZ3-E1 FAQ

1.How can I place an order for AH49EZ3-E1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH49EZ3-E1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AH49EZ3-E1 reliable?

The price and inventory of AH49EZ3-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH49EZ3-E1 is usually 5 days.

3.What payment methods are accepted for AH49EZ3-E1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH49EZ3-E1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH49EZ3-E1?

AH49EZ3-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH49EZ3-E1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AH49EZ3-E1?

For technical support, including AH49EZ3-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH49EZ3-E1 requirements.

6.How does Aetrix verify that AH49EZ3-E1 is sourced from the original manufacturer or authorized distributors?

All AH49EZ3-E1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH49EZ3-E1 meets industry standards.

7.What is the process for return or replacement of AH49EZ3-E1?

All AH49EZ3-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AH49EZ3-E1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AH49EZ3-E1 part is unused and in its original packaging.

Return procedure for AH49EZ3-E1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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