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Diodes Incorporated AH1751-PG-B-A
- Part No.:
- AH1751-PG-B-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH1751-PG-B-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,747
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Product details
Overview
AH1751-PG-B-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.
For engineers reviewing the AH1751-PG-B-A datasheet, AH1751-PG-B-A pinout, AH1751-PG-B-A application, or AH1751-PG-B-A equivalent, key selection criteria include magnetic operate/release thresholds (Bop = 5–70 G, Brp = –70 to –5 G), hysteresis (75 G typical), temperature-compensated band-gap regulation, and SIP3 package compatibility with standard SOT23 footprints.
Technical Context
The AH1751 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis, and open-collector pre-driver - enabling robust digital switching in noisy environments. Its internal band-gap regulator ensures stable internal biasing across 3.5–20V supply and full temperature range.
Magnetic response is bipolar latching: south-pole field ≥5 G turns output low and latches until field reverses below –5 G; north-pole field is not required for release. Output remains stable during supply transients due to regulated core voltage and reverse-polarity protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - supports wide-input industrial and automotive battery rails without external regulation. |
| Output Sink Current | 50mA - directly drives logic-level inputs, small relays, or LED indicators without external buffer. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and motor-adjacent placement in automotive and industrial systems. |
| Magnetic Hysteresis | 75 G typical - prevents chatter near switching threshold in vibration-prone applications like encoder wheels. |
| Output Saturation Voltage | 200 mV max at 50mA - ensures low power loss and reliable TTL/CMOS logic-low recognition. |
| Power Dissipation (SIP3) | 550 mW at 25°C, derates linearly to 0 mW at 150°C - defines thermal design margin for PCB layout. |
Pinout & Package
Package: SIP3 (3-pin single-inline package), commonly footprint-compatible with SOT23 layouts in Asia; green molding compound, lead-free, RoHS 3 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts 3.5–20V; powers internal regulator, Hall element, and output stage. |
| 2 (OUT) | Open-collector digital output | Sinks up to 50mA; requires external pull-up for logic-high state; latched on/off per magnetic polarity. |
| 3 (GND) | Ground reference | Common return for supply and output; provides reverse-polarity protection path. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching logic | Enables position detection with single magnet rotation - no need for alternating pole pairs or external timing circuitry. |
| Chip-level reverse-polarity protection | Prevents damage during incorrect wiring in field service or assembly - eliminates need for external diode. |
| Temperature-compensated band-gap regulator | Maintains consistent switching thresholds and output drive strength across –40°C to +125°C ambient. |
| Green molding compound (Br/Sb-free) | Meets halogen-free requirements per IEC 61249-2-21; <900 ppm Br, <900 ppm Cl, <1000 ppm Sb. |
Applications
| Rotor Position Sensing | Current Switch |
|---|---|
Use Scenario: Detecting angular position of permanent-magnet rotors in BLDC motors or stepper motors. IC Role / Device Role / Timing Role: Digital latch providing edge-triggered commutation signals synchronized to magnet pole transitions. Use Value: Enables precise 6-step commutation without analog signal conditioning; hysteresis rejects mechanical vibration noise. | Use Scenario: Monitoring current flow via magnetic field around conductor in overcurrent protection circuits. IC Role / Device Role / Timing Role: Magnetic switch that activates when conductor current exceeds threshold set by field strength. Use Value: Provides galvanically isolated current detection with no insertion loss or power dissipation in primary path. |
| Encoder | RPM Detection |
Use Scenario: Counting gear teeth or slots on rotating shafts using ferrous targets or embedded magnets. IC Role / Device Role / Timing Role: Edge-detecting latch generating clean quadrature or pulse train outputs for direction-agnostic counting. Use Value: Eliminates contact wear and EMI susceptibility of mechanical switches; supports >10 kHz pulse rates. | Use Scenario: Measuring rotational speed of fans, pumps, or conveyor belts in HVAC or factory automation. IC Role / Device Role / Timing Role: Pulse generator whose frequency correlates directly to shaft speed; output latched for stable period measurement. Use Value: Delivers jitter-free timing edges for microcontroller input-capture peripherals, even at low speeds (<1 Hz). |
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 Bop (15–100 G) and Brp (–100 to –10 G); wider hysteresis (90 G typ); same SIP3/SC59 packages. | Better noise immunity in high-vibration environments; suited for larger air gaps or weaker magnets. | Select AH3774 when magnetic field strength varies significantly or target magnet size is constrained. |
| DRV5013AQDBZR | Push-pull output (no pull-up needed); higher supply range (2.7–38 V); integrated diagnostics; SOIC-5 package. | Reduces BOM count and PCB area; adds fault reporting capability for functional safety designs. | Choose DRV5013AQDBZR for new designs requiring diagnostic readiness or simplified interface. |
Compared with AH1751-PG-B-A, AH3774 offers enhanced magnetic noise margin but shares identical pinout and thermal profile, while DRV5013AQDBZR replaces open-collector simplicity with push-pull convenience and diagnostic features - making it suitable for next-generation systems where reliability monitoring is mandated.
Availability
AH1751-PG-B-A is available at Aetrix Electronics and suitable for rotor position sensing, RPM detection, encoder feedback, and current-switch applications requiring stable component supply in extended-temperature environments.
Supply support for AH1751-PG-B-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 components for automotive, industrial, and computing markets.
The AH1751 belongs to Diodes' Hall-effect sensor product line, engineered for robust magnetic switching in harsh thermal and electromagnetic environments - particularly targeting motor control and motion feedback systems.
FAQ
What does "NRND" mean for AH1751-PG-B-A?
"NRND" stands for "Not Recommended for New Design." Diodes Incorporated continues to manufacture and support AH1751-PG-B-A for existing programs, but advises new designs to consider alternatives like AH3774 or DRV5013AQDBZR due to improved performance or feature sets. Lifecycle notifications and last-time-buy options remain available through authorized channels.
Can AH1751-PG-B-A operate with a 24V supply?
No - the absolute maximum supply voltage is 20V. Applying 24V exceeds the Absolute Maximum Rating and risks immediate or latent device failure. For 24V systems, use a series resistor or LDO to regulate down to ≤20V, or select a higher-voltage-rated Hall latch such as AH3774 (20V max) with appropriate external clamping if transient overshoot is expected.
Is the SIP3 package of AH1751-PG-B-A compatible with standard SOT23 footprints?
Yes - the SIP3 package is dimensionally compatible with common SOT23 land patterns used in Asia, though pin 1 orientation differs (SIP3 has staggered leads; SOT23 is symmetrical). Diodes provides recommended pad layouts on its website; verify alignment using the top-view marking diagram showing branded surface and pin 1 location before PCB fabrication.
Does AH1751-PG-B-A require an external pull-up resistor?
Yes - because it features an open-collector output, AH1751-PG-B-A requires an external pull-up resistor to VCC or another logic rail to establish a defined HIGH state when the output is not sinking current. Typical values range from 1kΩ to 10kΩ depending on rise time and bus loading requirements; ensure resistor power rating accommodates worst-case sink current (50mA).
AH1751-PG-B-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- 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-B-A FAQ
1.How can I place an order for AH1751-PG-B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1751-PG-B-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-B-A reliable?
The price and inventory of AH1751-PG-B-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-B-A is usually 5 days.
3.What payment methods are accepted for AH1751-PG-B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1751-PG-B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1751-PG-B-A?
AH1751-PG-B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1751-PG-B-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-B-A?
For technical support, including AH1751-PG-B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1751-PG-B-A requirements.
6.How does Aetrix verify that AH1751-PG-B-A is sourced from the original manufacturer or authorized distributors?
All AH1751-PG-B-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-B-A meets industry standards.
7.What is the process for return or replacement of AH1751-PG-B-A?
All AH1751-PG-B-A units undergo pre-shipment inspection (PSI). If there is an issue with AH1751-PG-B-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-B-A part is unused and in its original packaging.
Return procedure for AH1751-PG-B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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