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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH1751-WG-7-A

Name: AH1751-WG-7-A
Brand: Diodes Incorporated
SKU: AH1751-WG-7-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH1751-WG-7-A

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AH1751-WG-7-A.pdf

Description:: MAGNETIC SWITCH LATCH SC59-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AH1751-WG-7-A from Diodes Incorporated is a bipolar Hall-effect latch sensor in SC59 (SOT23) package, operating from 3.5V to 20V with −40°C to +125°C temperature range, 50mA output sink current, and magnetic switching thresholds of B_op = 5–70 G (south pole), B_rp = −70 to −5 G, used for rotor position sensing in brushless DC motor commutation.

For engineers reviewing the AH1751-WG-7-A datasheet, AH1751-WG-7-A pinout, AH1751-WG-7-A application, or AH1751-WG-7-A equivalent, key selection considerations include open-collector pre-driver capability, chip-level reverse-polarity protection, magnetic hysteresis (≥75 G), thermal derating curves for SC59, and NRND status requiring legacy design validation.

Technical Context

The AH1751 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis, and open-collector output pre-driver-enabling latched digital output without external components. Its internal band-gap regulator provides temperature-compensated bias across the full 3.5–20 V supply range.

Magnetic response is bipolar: south-pole field ≥5 G turns output low (latched); removal to ≤−5 G releases latch. Output saturation voltage is ≤300 mV at 50 mA sink, supporting direct interface with logic-level inputs or MOSFET gate drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.5 V to 20 V - supports wide-input industrial power rails without external regulation
Output Sink Current	50 mA - drives standard logic inputs or small-signal MOSFET gates directly
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive and industrial motor control environments
Magnetic Hysteresis	≥75 G - prevents chatter near switching threshold in noisy EMI environments
Output Type	Open-collector pre-driver - enables wired-OR configuration and flexible pull-up voltage selection
Reverse-Polarity Protection	Integrated - eliminates need for external series diode in battery-powered applications

Pinout & Package

SC59 package (commonly known as SOT23 in Asia), 3-pin surface-mount, lead-free and halogen-free "Green" compound.

Pin/Terminal	Circuit Role	Design Meaning
1 - VCC	Positive supply input	Bias source for internal regulator, Hall element, and signal chain; accepts 3.5–20 V
2 - OUT	Open-collector output	Sinks up to 50 mA when active; requires external pull-up for logic-high state
3 - GND	Ground reference	Common return path for supply and output current; connects to system ground plane

Key Features

Feature	Design Value
Bipolar latch operation	Retains output state after magnetic field removal until opposite polarity threshold is crossed - enables position memory in rotating systems
On-chip band-gap regulator	Stabilizes internal bias over supply and temperature - ensures consistent B_op/B_rp across 3.5–20 V and −40°C to +125°C
Chip-level reverse-connection protection	Withstands reverse supply polarity up to −0.3 V - protects against accidental battery misconnection
Low-output saturation voltage	V_OUT(SAT) ≤ 300 mV @ 50 mA - minimizes power loss and heat generation during sustained ON state

Applications

Brushless DC Motor Commutation

Rotor Position Sensing

Use Scenario: Detecting permanent magnet rotor angular position in 3-phase BLDC motors for electronic commutation timing.

IC Role / Device Role / Timing Role: Bipolar latch provides edge-triggered, hysteresis-stabilized digital position feedback synchronized to magnetic pole transitions.

Use Value: Enables precise 6-step commutation without external debouncing; operates reliably at 125°C ambient near motor windings.

Use Scenario: Monitoring rotational speed and direction in industrial gearmotor feedback loops.

IC Role / Device Role / Timing Role: Latched output maintains state between successive N/S pole crossings - simplifies RPM calculation via microcontroller edge counting.

Use Value: Eliminates need for external Schmitt trigger; 75 G hysteresis rejects vibration-induced false triggers in high-shock environments.

Current Switch Interface

Encoder Signal Conditioning

Use Scenario: Converting magnetic actuation from reed-switch replacement or proximity detection into logic-compatible signals.

IC Role / Device Role / Timing Role: Open-collector pre-driver interfaces directly with 3.3 V or 5 V MCU GPIOs or optocoupler inputs.

Use Value: 50 mA sink current supports direct drive of LED indicators or small relays; reverse-polarity protection reduces BOM count.

Use Scenario: Providing clean, noise-immune quadrature A/B channel inputs for incremental optical or magnetic encoders.

IC Role / Device Role / Timing Role: Dual AH1751s generate complementary latched outputs from orthogonal magnetic fields - forming robust index and phase signals.

Use Value: On-chip hysteresis and 25°C typ. B_op = 30 G ensure stable zero-crossing detection even with field strength variation across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AH3774	Higher B_op (min 15 G), lower hysteresis (40 G), SC59R package only	Better suited for weaker-field or higher-speed rotation where tighter switching tolerance is needed	Select AH3774 if field strength is <15 G or if SC59R footprint matches existing layout
AL33023	Unipolar operation, 3.3 V fixed supply, I²C interface, ±10 G sensitivity	Designed for digital position reporting in smart sensors-not drop-in replacement for latch logic	Choose AL33023 only for systems requiring programmable thresholds or digital bus integration

Compared with AH3774 and AL33023, AH1751-WG-7-A offers wider supply range (3.5–20 V), higher hysteresis (≥75 G), and true bipolar latching-making it optimal for rugged industrial motor control where field strength varies and noise immunity is critical.

Availability

AH1751-WG-7-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, rotor position sensing, current switch interfaces, and encoder signal conditioning requiring stable component supply in legacy industrial and automotive programs.

Supply support for AH1751-WG-7-A 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, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial, automotive, and computing markets.

AH1751 belongs to Diodes' Hall-effect sensor product line, engineered for robust magnetic position detection in harsh thermal and electrical environments-particularly targeting motor control, safety-critical motion feedback, and legacy system maintenance.

FAQ

Is AH1751-WG-7-A pin-compatible with other SOT23 Hall sensors?

No-AH1751-WG-7-A uses SC59 (SOT23-3) pinout: Pin 1 = VCC, Pin 2 = OUT, Pin 3 = GND. This differs from common unipolar SOT23 Hall switches (e.g., OH34U) that place GND on Pin 2. Physical compatibility does not guarantee functional equivalence due to bipolar latch behavior and hysteresis profile.

What does "NRND" status mean for AH1751-WG-7-A?

"NRND" (Not Recommended for New Design) indicates Diodes Incorporated no longer promotes AH1751 for new projects due to newer alternatives like AH3774. However, the part remains fully manufactured, supported, and available for legacy program continuity, with no announced obsolescence date or last-time-buy requirement.

Can AH1751-WG-7-A operate from a 3.3 V supply?

No-AH1751-WG-7-A has a minimum supply voltage of 3.5 V per datasheet. At 3.3 V, internal regulator dropout and Hall element biasing become unreliable, leading to inconsistent B_op/B_rp and potential failure to latch. Use AH3774 or AL33023 for true 3.3 V operation.

How is magnetic polarity defined for AH1751-WG-7-A operation?

AH1751-WG-7-A activates (OUT = low) when a south pole approaches the branded top surface (marked side). It releases (OUT = high) only when a north pole of sufficient strength (≥5 G) is applied to the same surface. The device is sensitive to field direction-not just magnitude-and requires correct orientation relative to the magnet's pole face.

AH1751-WG-7-A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Latch

Technology:: Hall Effect

Polarization:: South Pole

Sensing Range:: 7mT Trip, -7mT Release

Test Condition:: 25°C

Voltage - Supply:: 3.5V ~ 20V

Current - Supply (Max):: 6mA

Current - Output (Max):: 100mA

Output Type:: Open Collector

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-59-3

AH1751-WG-7-A FAQ

1.How can I place an order for AH1751-WG-7-A through Aetrix?

Please submit a Request for Quotation (RFQ) for AH1751-WG-7-A 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 AH1751-WG-7-A reliable?

The price and inventory of AH1751-WG-7-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1751-WG-7-A is usually 5 days.

3.What payment methods are accepted for AH1751-WG-7-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1751-WG-7-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH1751-WG-7-A?

AH1751-WG-7-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH1751-WG-7-A 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 AH1751-WG-7-A?

For technical support, including AH1751-WG-7-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1751-WG-7-A requirements.

6.How does Aetrix verify that AH1751-WG-7-A is sourced from the original manufacturer or authorized distributors?

All AH1751-WG-7-A 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 AH1751-WG-7-A meets industry standards.

7.What is the process for return or replacement of AH1751-WG-7-A?

All AH1751-WG-7-A units undergo pre-shipment inspection (PSI). If there is an issue with AH1751-WG-7-A, 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 AH1751-WG-7-A part is unused and in its original packaging.

Return procedure for AH1751-WG-7-A:

1.Submit a request within 90 days.

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

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