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Diodes Incorporated AH1751-PG-A-A
- Part No.:
- AH1751-PG-A-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH1751-PG-A-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
AH1751-PG-A-A from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position and RPM sensing in automotive and industrial motor control systems. It operates from 3.5V to 20V, delivers 50mA sink current, features open-collector output with 200mV saturation voltage at 50mA, and supports -40°C to +125°C operation with ±70G magnetic operate/release thresholds.
For engineers reviewing the AH1751-PG-A-A datasheet, AH1751-PG-A-A pinout, AH1751-PG-A-A application, or AH1751-PG-A-A equivalent, key selection criteria include magnetic hysteresis (75G), reverse-polarity protection, SIP3 package thermal derating, and latch behavior requiring south-pole activation and north-pole release.
Technical Context
The AH1751 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis, and open-collector pre-driver - all powered by an internal band-gap regulator enabling wide-supply operation. Its latch function maintains output state until magnetic polarity reversal crosses Brp (-5G), eliminating need for external latching logic.
Magnetic switching is polarity-specific: south-pole field ≥5G activates output (low), and output remains latched until north-pole field ≤-5G releases it. The device's 75G hysteresis ensures robust noise immunity in electrically noisy motor environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5V–20V DC: Enables direct connection to 12V automotive rails or industrial 24V systems without external regulation. |
| Output Sink Current | 50mA max: Drives standard optocouplers, PLC inputs, or MOSFET gate resistors without external buffer. |
| Magnetic Bop / Brp | +5G to +70G / -70G to -5G: Supports reliable detection of small permanent magnets at air gaps up to 2.5mm in motor commutation. |
| Hysteresis (Bhy) | 75G typical: Prevents chatter during slow-field transitions near threshold, critical for accurate RPM counting. |
| Operating Temperature | -40°C to +125°C: Qualified for under-hood automotive locations and industrial motor drive enclosures. |
| Output Type | Open-collector pre-driver: Allows wired-OR configuration and flexible pull-up voltage selection (up to 20V). |
| Power Dissipation (SIP3) | 550mW @ 25°C, derates linearly to 0mW at 150°C: Requires minimal PCB copper area for thermal management in SIP3 layout. |
Pinout & Package
SIP3 (3-pin single-inline package) with gull-wing leads, commonly used for through-hole mounting in cost-sensitive industrial controls. Dimensions: 2.00mm × 1.15mm × 0.51mm height; branded surface indicates active side orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Accepts 3.5–20V; powers internal regulator and sensing circuitry; reverse-polarity protected. |
| 2 - OUT | Open-collector digital output | Sinks up to 50mA when active; requires external pull-up; low-state voltage ≤300mV at 50mA load. |
| 3 - GND | Ground reference | Common return for supply and output; must be low-impedance to maintain magnetic noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch functionality | Requires opposite-polarity fields to switch: south pole turns ON, north pole turns OFF - eliminates need for dual-sensor setups in direction detection. |
| Integrated reverse-polarity protection | Withstands accidental VCC–GND reversal up to 20V without damage - reduces system-level fuse and diode count. |
| Temperature-compensated band-gap regulator | Maintains stable internal bias across -40°C to +125°C, ensuring consistent Bop/Brp thresholds over full operating range. |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); fully RoHS 3 compliant (2015/863/EU) for global automotive and industrial shipments. |
Applications
| Brushless DC Motor Commutation | Automotive Fan Speed Monitoring |
|---|---|
Use Scenario: Detecting rotor magnet position in 3-phase BLDC motors to sequence phase energization. IC Role / Device Role / Timing Role: Bipolar latch provides edge-triggered, polarity-discriminating feedback for precise 6-step commutation timing. Use Value: Eliminates need for dual Hall sensors per phase; 75G hysteresis prevents false triggering during rapid pole transitions. | Use Scenario: Measuring rotational speed of engine cooling fans via magnet-embedded fan hub. IC Role / Device Role / Timing Role: Converts magnet passage into clean, debounced digital pulses for microcontroller RPM calculation. Use Value: Open-collector output interfaces directly to 3.3V/5V MCU inputs; -40°C to +125°C rating matches under-hood thermal profile. |
| Industrial Conveyor Belt Encoder | Home Appliance Drum Rotation Sensing |
Use Scenario: Counting gear teeth or embedded magnets on conveyor shafts for position and speed feedback. IC Role / Device Role / Timing Role: Latch output holds state between magnet passes, enabling reliable low-speed detection down to 0.5 RPM. Use Value: 50mA sink current drives long cable runs to PLC inputs; SIP3 package allows compact PCB placement near shaft encoder ring. | Use Scenario: Detecting drum rotation direction and speed in washing machines using multi-pole ring magnet. IC Role / Device Role / Timing Role: South-pole activation followed by north-pole release enables bidirectional sensing with single device. Use Value: Green compound meets IEC 62474 VOC requirements for white goods; 3.5V min supply supports battery-backed standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3774 | Higher sensitivity (Bop = ±30G), lower hysteresis (40G), SC59R package only | Better for low-field, high-precision position sensing; less immune to EMI in noisy motor environments | Select when tighter magnetic tolerance is required and thermal derating is less critical than noise immunity |
| Melexis US1881 | Wider supply range (2.7–24V), integrated Zener clamp, higher temp rating (+150°C junction) | Supports direct battery monitoring and higher ambient temperature zones; lacks reverse-polarity protection | Choose for battery-powered tools or extended-temperature industrial controllers where reverse-connection risk is mitigated externally |
Compared with AH1751-PG-A-A, AH3774 offers finer magnetic resolution but reduced noise margin, while US1881 extends voltage and temperature range at the cost of added external protection components - making AH1751 optimal for cost-sensitive, high-noise, reverse-wiring-prone motor control applications.
Availability
AH1751-PG-A-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, automotive fan speed monitoring, and industrial conveyor belt encoder applications requiring stable component supply and long-term obsolescence management.
Supply support for AH1751-PG-A-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AH1751 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ruggedized position and speed sensing in automotive powertrain, industrial motor drives, and appliance control systems.
FAQ
Is AH1751-PG-A-A pin-compatible with AH3774?
No. AH1751-PG-A-A uses SIP3 packaging with pin 1=VCC, pin 2=OUT, pin 3=GND. AH3774 is only offered in SC59R (SOT-23 variant) with pin 1=VCC, pin 2=GND, pin 3=OUT - pinout and footprint differ, requiring PCB redesign.
What is the minimum magnetic field strength required to activate AH1751-PG-A-A?
The minimum operate point (Bop) is +5 Gauss (0.5 mT) for south-pole field applied to the branded side. Activation occurs reliably above this level; typical Bop is +30G, with maximum specified at +70G per datasheet DS31436 Rev. 4-3.
Does AH1751-PG-A-A require an external pull-up resistor on the OUT pin?
Yes. As an open-collector output, AH1751-PG-A-A requires an external pull-up resistor to a positive voltage (≤20V). Typical values range from 1kΩ to 10kΩ depending on rise time and bus capacitance; 4.7kΩ is recommended for 5V MCU interfacing.
Why is AH1751 marked "Not Recommended for New Design"?
Diodes Incorporated designated AH1751 as NRND due to newer alternatives (e.g., AH3774) offering improved sensitivity and package options. However, AH1751-PG-A-A remains fully manufactured, supported, and stocked for legacy program continuity and cost-sensitive applications where its SIP3 form factor and reverse-protection are advantageous.
AH1751-PG-A-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH1751-PG-A-A FAQ
1.How can I place an order for AH1751-PG-A-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1751-PG-A-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-PG-A-A reliable?
The price and inventory of AH1751-PG-A-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-PG-A-A is usually 5 days.
3.What payment methods are accepted for AH1751-PG-A-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1751-PG-A-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1751-PG-A-A?
AH1751-PG-A-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1751-PG-A-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-PG-A-A?
For technical support, including AH1751-PG-A-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1751-PG-A-A requirements.
6.How does Aetrix verify that AH1751-PG-A-A is sourced from the original manufacturer or authorized distributors?
All AH1751-PG-A-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-PG-A-A meets industry standards.
7.What is the process for return or replacement of AH1751-PG-A-A?
All AH1751-PG-A-A units undergo pre-shipment inspection (PSI). If there is an issue with AH1751-PG-A-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-PG-A-A part is unused and in its original packaging.
Return procedure for AH1751-PG-A-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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