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Diodes Incorporated AH477AZ4-AG1
- Part No.:
- AH477AZ4-AG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH477AZ4-AG1.pdf
- Description:
- IC MOTOR DRIVER 3.5V-18V TO94
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
AH477AZ4-AG1 from BCD Semiconductor Manufacturing Limited is a single-phase Hall-effect latch IC with integrated H-bridge output driver, designed for brushless DC motor commutation. It features on-chip Hall sensing, amplifier/comparator with 70 G hysteresis, dual bi-directional outputs (DO/DOB), 3.5–18 V supply range, and operates from –20 °C to 85 °C in TO-94 (SIP-4L) package. Used in single-coil BLDC fans and PWM-controlled motor speed systems.
For engineers reviewing the AH477AZ4-AG1 datasheet, AH477AZ4-AG1 pinout, AH477AZ4-AG1 application, or AH477AZ4-AG1 equivalent, key selection criteria include magnetic switching thresholds (BOP/BRP), continuous 250 mA output current capability, H-bridge sink/driver polarity reversal behavior, and compatibility with 0.1–25 kHz PWM power supply control.
Technical Context
The AH477AZ4-AG1 implements a latching Hall sensor architecture with Schmitt-trigger comparator and pre-driver stage controlling complementary DO/DOB outputs. Its internal bandgap regulator provides temperature-compensated bias across the full operating voltage range (3.5–18 V).
Magnetic actuation follows bipolar latching behavior: DO sinks and DOB drives when flux exceeds +5–70 G (Grade A), and reverses only after flux falls below –5 to –70 G. Output saturation voltages are specified at 0.45–0.65 V (sink) and VCC–1.3 to VCC–1.0 V (drive) under 200 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 18 V - supports wide-input industrial and automotive 12 V rail operation without external regulation |
| Operating Temperature | –20 °C to 85 °C - qualified for fan and motor control in ambient-ventilated enclosures |
| Output Current (Continuous) | 250 mA - sufficient to directly drive small single-coil BLDC motor windings |
| Magnetic Operating Point (BOP) | 5–70 G (Grade A) - enables reliable activation with low-strength ferrite magnets at air gaps up to 2 mm |
| Hysteresis (BHYS) | 70 G - prevents chatter during slow or noisy magnetic field transitions |
| ESD Rating (HBM) | 6000 V - robust handling in manual assembly and board-level integration |
| Output Rise/Fall Time | 0.5–1.0 µs - supports clean switching at PWM frequencies up to 25 kHz |
Pinout & Package
Supplied in low-profile TO-94 (SIP-4L) package with 3.71–3.91 mm body width, 14.0–15.3 mm length, and 1.27 mm lead pitch. Pin 1 (VCC) is marked by notch orientation; device is mounted with marking side facing up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Accepts 3.5–18 V; powers internal regulator, Hall sensor, and output drivers |
| 2 - DO | Output 1 (sink/driver) | Sinks current when magnet North pole approaches; drives high when South pole approaches |
| 3 - DOB | Output 2 (complementary) | Complements DO state - drives when DO sinks, sinks when DO drives |
| 4 - GND | Ground reference | Common return path for supply and both outputs; must be low-impedance for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| H-bridge output topology | Enables bidirectional coil current control using only two pins - eliminates need for external half-bridge drivers |
| Integrated bandgap regulator | Stabilizes internal bias over temperature and supply variation - ensures consistent BOP/BRP across operating range |
| Low-output switching noise | Minimizes EMI in motor drive circuits - critical for EMC-compliant fan and appliance designs |
| TO-94 (SIP-4L) package | Through-hole mounting with 1.27 mm lead pitch - compatible with standard wave-solder processes and mechanical retention in rotating assemblies |
| Pb-free & RoHS compliant (G1 suffix) | Meets global environmental compliance requirements without performance trade-offs |
Applications
| Single-Coil BLDC Fan Control | Small Appliance Motor Commutation |
|---|---|
Use Scenario: Brushless DC cooling fan in network switch chassis requiring silent, reliable speed control via PWM. IC Role / Device Role / Timing Role: Hall latch providing rotor position feedback and driving coil current direction via DO/DOB outputs. Use Value: Eliminates external driver ICs and reduces BOM count while maintaining precise 0.1–25 kHz PWM responsiveness. | Use Scenario: Compact vacuum cleaner motor with single-phase winding and hall-based commutation. IC Role / Device Role / Timing Role: Latching sensor detecting magnet polarity to sequence coil energization timing. Use Value: Enables compact motor design with direct drive capability and thermal stability up to 85 °C ambient. |
| Automotive HVAC Blower | Industrial Pump Speed Regulation |
Use Scenario: Cabin air blower motor in entry-level automotive HVAC system with 12 V battery supply. IC Role / Device Role / Timing Role: Magnetic latch interfacing with rotor-mounted magnet to generate commutation signals. Use Value: Operates across full 3.5–18 V range - tolerates cold-crank and load-dump transients without reset or latch-up. | Use Scenario: Low-power diaphragm pump in medical analyzer requiring precise flow rate control. IC Role / Device Role / Timing Role: Hall-based commutator enabling variable-speed operation via analog or PWM input. Use Value: 250 mA continuous output sustains torque at low RPM; 70 G hysteresis prevents false triggering from vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL477A-S12-TB | Same functional block diagram but uses SOT-23-3 package; single output only (no DOB); no H-bridge | Limited to unidirectional load control; requires external P-channel driver for full bridge | Select only if space-constrained PCB and coil drive is unidirectional |
| US1881EUA-AAA-000 | Open-drain output (not push-pull); 100 mA max sink current; no internal regulator - requires stable 5 V supply | Cannot drive coils directly; needs external MOSFET stage for motor loads | Choose only for low-power sensing-only roles where external drive is already present |
Compared with AL477A-S12-TB and US1881EUA-AAA-000, the AH477AZ4-AG1 uniquely integrates complementary H-bridge outputs and internal regulation - enabling direct single-coil BLDC drive from raw 12 V without auxiliary circuitry or voltage translation.
Availability
AH477AZ4-AG1 is available at Aetrix Electronics and suitable for single-coil BLDC fan control, automotive HVAC blowers, and industrial pump speed regulation requiring stable component supply and long-term lifecycle support.
Supply support for AH477AZ4-AG1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer and foundry partner, specializing in high-reliability power management and sensor interface solutions for industrial and automotive markets.
The AH477A product line targets cost-sensitive, high-volume brushless motor applications requiring integrated Hall sensing and robust output drive - emphasizing simplicity, thermal resilience, and direct coil interface capability.
FAQ
What is the magnetic polarity response of AH477AZ4-AG1?
The device latches on North pole approach (BOP > +5–70 G) with DO sinking and DOB driving; it releases only upon South pole approach (BRP < –5 to –70 G), reversing output states. This bipolar latching behavior ensures stable commutation without continuous magnetic field monitoring.
Can AH477AZ4-AG1 drive a coil directly without external transistors?
Yes - its DO and DOB outputs each support 250 mA continuous current and feature complementary push-pull drive/sink capability. The integrated H-bridge allows direct connection to a single motor coil, eliminating external MOSFETs or driver ICs in typical fan and small-appliance motors.
Is AH477AZ4-AG1 compatible with 24 V systems?
No - absolute maximum supply voltage is 20 V, and recommended operating range is 3.5–18 V. Applying 24 V exceeds rating and risks permanent damage. For 24 V systems, use an external 18 V LDO or DC-DC converter to power the device.
How does the internal bandgap regulator affect performance?
The regulator stabilizes bias currents across temperature and supply variations, ensuring consistent magnetic thresholds (BOP/BRP), output saturation voltages, and switching hysteresis. This enables reliable operation from –20 °C to 85 °C without external compensation components.
AH477AZ4-AG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 7mT Trip, -7mT Release
- Test Condition:
- -
- Voltage - Supply:
- 3.5V ~ 18V
- Current - Supply (Max):
- 16mA
- Current - Output (Max):
- -
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-94
AH477AZ4-AG1 FAQ
1.How can I place an order for AH477AZ4-AG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH477AZ4-AG1 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 AH477AZ4-AG1 reliable?
The price and inventory of AH477AZ4-AG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH477AZ4-AG1 is usually 5 days.
3.What payment methods are accepted for AH477AZ4-AG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH477AZ4-AG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH477AZ4-AG1?
AH477AZ4-AG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH477AZ4-AG1 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 AH477AZ4-AG1?
For technical support, including AH477AZ4-AG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH477AZ4-AG1 requirements.
6.How does Aetrix verify that AH477AZ4-AG1 is sourced from the original manufacturer or authorized distributors?
All AH477AZ4-AG1 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 AH477AZ4-AG1 meets industry standards.
7.What is the process for return or replacement of AH477AZ4-AG1?
All AH477AZ4-AG1 units undergo pre-shipment inspection (PSI). If there is an issue with AH477AZ4-AG1, 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 AH477AZ4-AG1 part is unused and in its original packaging.
Return procedure for AH477AZ4-AG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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