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Diodes Incorporated AH1751-RG-7-A
- Part No.:
- AH1751-RG-7-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1751-RG-7-A.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59R
- Quantity:
- Payment:
- Shipping:
Inventory:3,236
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Product details
Overview
AH1751-RG-7-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-RG-7-A datasheet, AH1751-RG-7-A pinout, AH1751-RG-7-A application, or AH1751-RG-7-A equivalent, key selection criteria include magnetic hysteresis (75 Gauss), BOP/BRP thresholds (±5–70 Gauss), thermal derating curves for SC59R package, and reverse-polarity protection for harsh environments.
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 latching behavior ensures stable digital output during magnetic field transitions without external feedback.
Magnetic switching is defined by bipolar thresholds: turn-on occurs when south-pole flux exceeds BOP (5–70 Gauss), and latched "on" state releases only when flux falls below BRP (-70 to -5 Gauss), delivering noise-immune edge detection in rotating machinery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - enables direct connection to 12V automotive rails or industrial 24V systems without external regulation |
| Output Sink Current | 50mA - drives standard optocouplers, logic-level MOSFET gates, or PLC input modules directly |
| BOP / BRP | +5 to +70G / -70 to -5G - provides robust switching margin against mechanical vibration and temperature drift |
| Hysteresis | 75G typical - eliminates chatter during slow or noisy magnetic field transitions |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
| VOUT(SAT) | 200mV max @ 50mA - ensures low power dissipation and reliable TTL/CMOS interface compatibility |
| Reverse Polarity Protection | Integrated - prevents damage if VCC and GND are swapped during installation or maintenance |
Pinout & Package
AH1751-RG-7-A uses the SC59R package (commonly known as SOT-23 in Asia), a 3-pin surface-mount package with gull-wing leads and branded top marking "SK" per Diodes Inc. documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Positive supply input | Accepts 3.5–20V DC; 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 level generation |
| 3: GND | Ground reference | Common return path for supply and output current; reverse-polarity protected |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Eliminates need for external Schmitt trigger or debounce circuitry in encoder and commutation applications |
| On-chip band-gap regulator | Stabilizes internal bias over full supply and temperature range, ensuring consistent BOP/BRP across 3.5–20V |
| Chip-level reverse-connection protection | Prevents catastrophic failure during board assembly or field wiring errors without external diode |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets RoHS 3 and automotive environmental compliance |
Applications
| Rotor Position Sensing | Current Switch |
|---|---|
Use Scenario: Detecting magnetic pole transitions on BLDC motor rotors for electronic commutation. IC Role / Device Role / Timing Role: Digital latch providing synchronized edge-triggered signals aligned to rotor angular position. Use Value: Enables precise 6-step commutation without timing drift across -40°C to 125°C ambient. | Use Scenario: Monitoring current flow via magnetic field around a conductor in overload protection circuits. IC Role / Device Role / Timing Role: Latching switch that remains active until magnetic field collapses below BRP threshold. Use Value: Provides fail-safe hold-on behavior during transient overcurrent events, improving system reliability. |
| Encoder | RPM Detection |
Use Scenario: Converting gear tooth or magnet array rotation into quadrature or pulse train outputs. IC Role / Device Role / Timing Role: Magnetic threshold detector generating clean digital pulses per feature passage. Use Value: Delivers jitter-free pulse edges with 75G hysteresis, supporting up to 20k RPM measurement accuracy. | Use Scenario: Measuring rotational speed of fans, pumps, or conveyor belts using embedded magnets. IC Role / Device Role / Timing Role: Pulse generator synchronized to magnetic pole crossings for frequency-based speed calculation. Use Value: Maintains stable pulse repetition rate across supply variations (3.5–20V) and temperature extremes. |
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/BRP (±100G), wider hysteresis (100G), same SC59R package and pinout | Better suited for high-air-gap or low-field applications where AH1751 may not reliably switch | Select AH3774 when operating with weak magnets or large mechanical tolerances |
| DRV5013A2QLPGM | 3.3V–36V supply, 100mA sink, integrated ESD protection (±4kV HBM), different pinout (VCC/OUT/GND vs VCC/GND/OUT) | Requires PCB layout change; offers higher ESD immunity and broader voltage range | Choose DRV5013A2QLPGM for new designs needing enhanced robustness and future-proof voltage scalability |
Compared with AH3774 and DRV5013A2QLPGM, AH1751-RG-7-A provides optimal cost-performance balance for established 12V motor control designs with moderate air gaps and existing SC59R footprint constraints, while offering proven thermal stability up to 125°C.
Availability
AH1751-RG-7-A is available at Aetrix Electronics and suitable for rotor position sensing, RPM detection, encoder interfaces, and current-switch applications requiring stable component supply in legacy industrial and automotive programs.
Supply support for AH1751-RG-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 components for automotive, industrial, and computing markets.
The AH1751 belongs to Diodes' Hall-effect sensor product line, engineered for contactless position and speed sensing in thermally demanding environments where latch stability and supply flexibility are critical.
FAQ
Is AH1751-RG-7-A pin-compatible with other Diodes Hall latches like AH3774?
Yes - AH1751-RG-7-A and AH3774 share identical SC59R package dimensions, pin numbering (VCC/OUT/GND), and pin functions. No PCB redesign is required for drop-in replacement, though magnetic thresholds differ and must be verified in final application.
What is the maximum continuous output sink current at 125°C ambient?
At TA = +125°C, the SC59R package's power dissipation limit drops to 46mW. With VOUT(SAT) ≤ 300mV, the maximum sustainable sink current is approximately 153mA - however, the absolute rated limit remains 100mA per Absolute Maximum Ratings, so 100mA is the safe design ceiling.
Does AH1751-RG-7-A require an external pull-up resistor on the OUT pin?
Yes - the open-collector output requires an external pull-up resistor to VCC or another logic rail. Typical values range from 1kΩ to 10kΩ depending on rise time and bus loading requirements; no internal pull-up is present.
Why is AH1751 marked "Not Recommended for New Design"?
Diodes Incorporated designated AH1751 as NRND due to newer alternatives (e.g., AH3774) offering improved magnetic sensitivity and hysteresis. However, AH1751-RG-7-A remains fully supported for legacy production, with guaranteed supply and unchanged specifications per DS31436 Rev. 4-3.
AH1751-RG-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:
- Obsolete
- 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-59R
AH1751-RG-7-A FAQ
1.How can I place an order for AH1751-RG-7-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1751-RG-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-RG-7-A reliable?
The price and inventory of AH1751-RG-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-RG-7-A is usually 5 days.
3.What payment methods are accepted for AH1751-RG-7-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1751-RG-7-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1751-RG-7-A?
AH1751-RG-7-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1751-RG-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-RG-7-A?
For technical support, including AH1751-RG-7-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1751-RG-7-A requirements.
6.How does Aetrix verify that AH1751-RG-7-A is sourced from the original manufacturer or authorized distributors?
All AH1751-RG-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-RG-7-A meets industry standards.
7.What is the process for return or replacement of AH1751-RG-7-A?
All AH1751-RG-7-A units undergo pre-shipment inspection (PSI). If there is an issue with AH1751-RG-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-RG-7-A part is unused and in its original packaging.
Return procedure for AH1751-RG-7-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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