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Diodes Incorporated AH477AZ4-BG1
- Part No.:
- AH477AZ4-BG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH477AZ4-BG1.pdf
- Description:
- IC MOTOR DRIVER 3.5V-18V TO94
- Quantity:
- Payment:
- Shipping:
Inventory:961
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Product details
Overview
AH477AZ4-BG1 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, Schmitt-triggered magnetic switching (BOP = 5–70 G, BRP = –70 to –5 G), dual complementary outputs (DO/DOB), 3.5–18 V supply range, and ±250 mA continuous sink/source capability in TO-94 (SIP-4L) package.
For engineers reviewing the AH477AZ4-BG1 datasheet, AH477AZ4-BG1 pinout, AH477AZ4-BG1 application, or AH477AZ4-BG1 equivalent, this device serves as a magnetic position-sensing latch for unidirectional coil drive in BLDC fan and motor control circuits where precise polarity-dependent output state retention and wide-voltage operation are required.
Technical Context
The AH477AZ4-BG1 implements a bipolar latching Hall sensor with built-in hysteresis (BHYS = 70 G) to reject noise during magnetic field transitions. Its internal bandgap regulator ensures stable biasing across temperature and supply voltage variations.
The H-bridge output stage provides complementary push-pull drive: DO sinks current while DOB sources it when north-pole field exceeds BOP; states reverse when south-pole field falls below BRP. Output saturation voltages are specified at 0.45–0.65 V (sink) and VCC−1.3 to VCC−1.0 V (source), enabling efficient coil switching in single-coil BLDC topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 18 V - supports direct connection to 12 V automotive or industrial rails without external regulation |
| Operating Temperature | −20 °C to +85 °C - qualified for fan and motor control in ambient industrial environments |
| Output Current | ±250 mA continuous - drives typical single-coil BLDC loads without external buffer transistors |
| Magnetic Thresholds | BOP = 5–70 G, BRP = −70 to −5 G - enables reliable latching with standard ferrite magnets at air gaps up to 2 mm |
| ESD Rating | 6000 V HBM - withstands handling and board assembly without additional protection circuitry |
| Output Rise/Fall Time | 0.5–1.0 µs - supports PWM speeds up to 25 kHz for variable-speed fan control |
Pinout & Package
Package: TO-94 (SIP-4L), 4-pin single-inline package with 2.54 mm pitch, low-profile (5.28 mm height), RoHS-compliant "G1" green marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts 3.5–18 V; powers internal regulator, amplifier, and driver stages |
| 2 (DO) | Complementary output (sink) | Active-low output; sinks up to 250 mA when magnet polarity triggers latching |
| 3 (DOB) | Complementary output (source) | Active-high output; sources up to 250 mA opposite to DO state for H-bridge coil drive |
| 4 (GND) | Power ground reference | Common return path for supply and output currents; must be low-impedance for thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall sensor + amplifier + Schmitt trigger | Eliminates need for external signal conditioning; enables direct magnet-to-digital conversion with noise immunity |
| H-bridge output driver | Provides bidirectional coil current control using only two complementary outputs - reduces external component count |
| Internal bandgap regulator | Stabilizes internal bias over supply and temperature variation, ensuring consistent BOP/BRP across operating conditions |
| Low-output switching noise | Minimizes EMI in motor drive paths, easing EMC compliance for fan and appliance applications |
Applications
| Single-Coil BLDC Fan Control | Small Appliance Motor Commutation |
|---|---|
Use Scenario: Speed-regulated cooling fan in office equipment or network enclosures using PWM-controlled 12 V supply. IC Role / Device Role / Timing Role: Magnetic latch providing phase-commutated drive signals to single stator coil based on rotor magnet polarity. Use Value: Enables compact, low-cost fan module design with no external logic or gate drivers due to integrated H-bridge and wide supply range. | Use Scenario: Brushless motor in cordless power tools or kitchen appliances requiring reliable start-up and stall detection. IC Role / Device Role / Timing Role: Rotor position sensor and coil driver interface, converting Hall flux transitions into timed complementary drive pulses. Use Value: Delivers 250 mA coil drive directly, eliminating discrete MOSFETs and reducing PCB area and BOM cost. |
| Automotive HVAC Blower | Industrial Pump Driver |
Use Scenario: Cabin air blower motor in entry-level automotive HVAC systems with 12 V battery supply. IC Role / Device Role / Timing Role: Latching Hall switch generating commutation timing for single-phase BLDC motor under varying load and temperature. Use Value: Qualified for −20 °C to +85 °C operation and 6000 V HBM ESD, meeting automotive subsystem robustness requirements without added protection. | Use Scenario: Low-power fluid pump in building automation or medical devices requiring quiet, reliable rotation. IC Role / Device Role / Timing Role: Magnetic position detector and power-stage controller that alternately energizes coil ends to sustain rotation. Use Value: Hysteresis (70 G) prevents chatter near zero-crossing, ensuring smooth torque delivery and low acoustic noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch with H-bridge drive applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3425ELHLT-T | Higher BOP/BRP (±100 G), 30 V max supply, SOIC-8 package | Requires external pull-ups and level-shifting for 12 V coil drive; not pin-compatible | Preferred for higher magnetic sensitivity or extended voltage margin; needs PCB redesign |
| MELEXIS US1881EUA-ABA-002-SP | Open-drain outputs, 3.5–24 V, TO-92 package, no integrated H-bridge | Needs external dual-MOSFET half-bridge; lower integration but wider temp range (−40 to +150 °C) | Chosen when extreme temperature operation outweighs integration benefit |
Compared with A3425ELHLT-T and US1881EUA-ABA-002-SP, AH477AZ4-BG1 offers full H-bridge integration in SIP-4L, eliminating external drive components for single-coil BLDC - reducing system size and cost at the expense of package footprint and maximum voltage headroom.
Availability
AH477AZ4-BG1 is available at Aetrix Electronics and suitable for brushless DC fan control, small-appliance motor commutation, and automotive HVAC blower applications requiring stable component supply and RoHS-compliant green packaging.
Supply support for AH477AZ4-BG1 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 China-based analog and mixed-signal IC designer and foundry partner specializing in high-reliability power management and sensor interface solutions.
The AH477A product line targets cost-sensitive, high-volume motion control applications - delivering integrated Hall latches with on-chip drivers to replace discrete Hall + transistor combinations in BLDC motors and fans.
FAQ
What is the magnetic polarity response behavior of AH477AZ4-BG1?
The device latches on positive magnetic flux density exceeding BOP (5–70 G), turning DO low and DOB high. It remains latched until reverse polarity drops below BRP (−70 to −5 G), then flips outputs: DO goes high and DOB goes low. This bipolar latching enables unambiguous rotor position tracking in single-coil BLDC systems.
Can AH477AZ4-BG1 drive a 24 V coil directly?
No - its absolute maximum supply voltage is 20 V, and recommended operating range is 3.5–18 V. Driving a 24 V coil requires external level-shifting or a higher-voltage-rated alternative such as the A3425ELHLT-T (30 V max), as exceeding 20 V risks permanent damage per Absolute Maximum Ratings.
Is an external decoupling capacitor required?
Yes - a 0.1 µF ceramic capacitor between VCC and GND is specified in the typical application circuit (Figure 13) to suppress supply noise generated by switching output currents. Omitting it may cause erratic switching or increased EMI in motor drive paths.
Does AH477AZ4-BG1 support bidirectional rotation control?
No - it is a single-phase latch optimized for unidirectional rotation in fixed-configuration BLDC motors and fans. Bidirectional control requires either two independent Hall sensors with logic or a dedicated 3-phase controller IC; AH477AZ4-BG1 provides only one latched output pair per magnetic transition.
AH477AZ4-BG1 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:
- 10mT Trip, -10mT 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-BG1 FAQ
1.How can I place an order for AH477AZ4-BG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH477AZ4-BG1 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-BG1 reliable?
The price and inventory of AH477AZ4-BG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH477AZ4-BG1 is usually 5 days.
3.What payment methods are accepted for AH477AZ4-BG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH477AZ4-BG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH477AZ4-BG1?
AH477AZ4-BG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH477AZ4-BG1 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-BG1?
For technical support, including AH477AZ4-BG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH477AZ4-BG1 requirements.
6.How does Aetrix verify that AH477AZ4-BG1 is sourced from the original manufacturer or authorized distributors?
All AH477AZ4-BG1 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-BG1 meets industry standards.
7.What is the process for return or replacement of AH477AZ4-BG1?
All AH477AZ4-BG1 units undergo pre-shipment inspection (PSI). If there is an issue with AH477AZ4-BG1, 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-BG1 part is unused and in its original packaging.
Return procedure for AH477AZ4-BG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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