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Diodes Incorporated AH3776-SA-7
- Part No.:
- AH3776-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3776-SA-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,648
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Product details
Overview
AH3776-SA-7 from Diodes Incorporated is a high-voltage, medium-sensitivity bipolar Hall-effect latch IC designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features ±110G typical operate/release points (BOP/BRP), 800kHz chopper frequency, -40°C to +125°C temperature range, and open-drain output with 30–55mA current limit.
For engineers reviewing the AH3776-SA-7 datasheet, AH3776-SA-7 pinout, AH3776-SA-7 application, or AH3776-SA-7 equivalent, key selection criteria include magnetic sensitivity stability over voltage/temperature, reverse-battery protection capability, output current limiting behavior, and compatibility with SOT23 PCB layouts in space-constrained BLDC control modules.
Technical Context
The AH3776 employs chopper-stabilized architecture with dynamic offset cancellation and internal bandgap regulation to maintain stable BOP/BRP across supply voltage (3–28V) and temperature (-40°C to +125°C). Its hysteresis of 160–280G ensures noise-immune latching behavior in electrically noisy motor environments.
It integrates reverse-blocking diode and Zener clamp on VDD, plus output Zener clamp and overcurrent limiting (30–55mA), enabling robust operation in automotive-grade and industrial power systems where supply transients and load faults occur. The single open-drain output requires external pull-up and supports direct interface to microcontroller GPIOs or logic-level MOSFET gates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - Supports wide-input industrial power rails without external regulators |
| Operate Point (BOP) | +110G typical - Enables reliable activation with standard ferrite magnets at ≥1.5mm air gap |
| Release Point (BRP) | -110G typical - Ensures clean, hysteresis-based latching without chatter near zero field |
| Output Type | Open-drain, 60mA max continuous - Allows flexible pull-up voltage selection and wired-OR configuration |
| Chopping Frequency | 800kHz - Suppresses low-frequency drift and enhances immunity to mechanical stress and thermal gradients |
| Startup Time | 10µs typical - Enables fast response in high-RPM motor commutation (e.g., >100k RPM detection) |
| ESD Rating (HBM) | 6kV - Provides handling robustness during automated assembly and field service |
Pinout & Package
Package: SOT23 - Surface-mount, 3-pin, JEDEC-standard footprint (2.9mm × 1.3mm × 1.0mm), compatible with standard reflow profiles and AOI inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0–28V; includes reverse-blocking diode and 28V Zener clamp for transient protection |
| 2 - GND | Ground reference | Common return for internal regulator, Hall sensor, and output switch; must be low-impedance |
| 3 - OUTPUT | Open-drain output | Sinks up to 55mA when active; requires external pull-up; clamped to 28V for fault tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates (pulls output low); North pole releases - enables direction-agnostic rotor position detection |
| Chopper-stabilized sensing | 800kHz modulation eliminates 1/f noise and reduces thermal drift to <±0.5G/°C - critical for precision RPM measurement |
| Integrated supply protection | Reverse-blocking diode + 28V Zener clamp - withstands -28V reverse battery events without external components |
| Output current limiting | 30–55mA active clamp - prevents damage during short-circuit or excessive pull-up voltage conditions |
| High-temperature operation | -40°C to +125°C ambient - qualified for under-hood and enclosed motor drive environments |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Six-step commutation in 3-phase fan or pump motors using three AH3776 sensors spaced 60° mechanically. IC Role / Device Role / Timing Role: Position sensor providing synchronized digital edge transitions to MCU timer capture inputs. Use Value: Enables precise 120° electrical phase alignment with ±2° angular accuracy over full temperature range and supply variation. |
Use Scenario: Counting magnetic pole transitions on rotating shaft for real-time speed feedback in HVAC blowers. IC Role / Device Role / Timing Role: Digital pulse generator with sub-10µs startup and consistent edge timing independent of magnet strength. Use Value: Delivers stable 10kHz+ pulse trains at 30k RPM with jitter <1µs, supporting closed-loop PID control bandwidths >1kHz. |
| Flow Meter Sensing | Linear Encoder Interface |
Use Scenario: Detecting rotation of turbine blades in water/gas meters with embedded permanent magnets. IC Role / Device Role / Timing Role: Magnetic threshold detector converting mechanical flow rate into proportional pulse frequency. Use Value: Maintains ±3% pulse count accuracy across 0.5–28V supply and -40°C to +85°C, meeting MID Class B metrology requirements. |
Use Scenario: Reading position of linear actuator via alternating-pole magnetic strip in printer/cartridge positioning. IC Role / Device Role / Timing Role: Edge-triggered position index marker generating quadrature-ready signals with hysteresis filtering. Use Value: Resolves 1mm increments reliably at 2m/s velocity with no missed counts due to EMI or vibration-induced bounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3716-SA-7 | Lower BOP/BRP (±60G typical), 2.7–26V supply, 10µA lower IDD, same SOT23 package | Better suited for weak-field or close-proximity sensing; reduced sensitivity improves noise margin in high-EMI environments | Select when magnet gap <1.0mm or supply is constrained below 3.0V |
| AL3776QSA-7 | AEC-Q100 Grade 0 qualified, extended TJ = +150°C, tighter BOP/BRP tolerance (±10G), same pinout | Required for automotive under-hood BLDC fans, radiator fans, and EPS sensors | Choose for automotive production programs requiring PPAP and IATF 16949 traceability |
Compared with AH3776-SA-7, AH3716-SA-7 trades sensitivity for lower power and wider low-voltage margin, while AL3776QSA-7 adds automotive qualification and tighter magnetic tolerances at higher cost-neither is drop-in but both share identical SOT23 layout and interface logic.
Availability
AH3776-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor control, flow metering, and linear position sensing requiring stable component supply across industrial automation, home appliance, and personal care product lifecycles.
Supply support for AH3776-SA-7 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 power management, signal integrity, and sensor solutions for industrial, computing, and consumer markets.
The AH3776 belongs to Diodes' Hall-effect sensor product line, engineered for high-reliability magnetic position and speed sensing in cost-sensitive, high-volume motor and metering applications with extended temperature and voltage requirements.
FAQ
What is the minimum required pull-up resistor value for the AH3776-SA-7 output?
The output can sink up to 55mA continuously. For a 5V pull-up with 0.4V maximum VOUT_ON, the minimum RL is (5V − 0.4V)/55mA ≈ 84Ω. However, typical designs use 1kΩ–10kΩ to limit power and match MCU input thresholds. Lower values improve rise time but increase quiescent current.
Does the AH3776-SA-7 require an external bypass capacitor?
Yes - a 10nF to 100nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal bandgap regulator and improve RF noise immunity. Placement within 2mm of the SOT23 pins is critical for effectiveness in motor-drive EMI environments.
Can the AH3776-SA-7 operate with a 2.5V supply?
No - the absolute minimum operating supply is 3.0V per Recommended Operating Conditions. At 2.5V, internal circuitry (including bandgap regulator and chopper amplifier) fails to bias correctly, resulting in undefined output state and potential latch-up. Use AH3716 for 2.7V operation.
Is the AH3776-SA-7 pin-compatible with other Diodes Hall latches in SOT23?
Yes - all Diodes SOT23 Hall latches (e.g., AH3716, AH3772, AH3782) share identical pin 1 (VDD), pin 2 (GND), pin 3 (OUTPUT) assignment and SOT23 footprint. However, magnetic thresholds, supply ranges, and output drive strength differ - verify functional compatibility before substitution.
AH3776-SA-7 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:
- 14mT Trip, -14mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3776-SA-7 FAQ
1.How can I place an order for AH3776-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3776-SA-7 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 AH3776-SA-7 reliable?
The price and inventory of AH3776-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3776-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3776-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3776-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3776-SA-7?
AH3776-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3776-SA-7 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 AH3776-SA-7?
For technical support, including AH3776-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3776-SA-7 requirements.
6.How does Aetrix verify that AH3776-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3776-SA-7 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 AH3776-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3776-SA-7?
All AH3776-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3776-SA-7, 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 AH3776-SA-7 part is unused and in its original packaging.
Return procedure for AH3776-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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