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Diodes Incorporated AH276Q-PL-B-B
- Part No.:
- AH276Q-PL-B-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH276Q-PL-B-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 4SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,004
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Product details
Overview
AH276Q-PL-B-B from Diodes Incorporated is a complementary-output Hall-effect latch IC designed for electronic commutation in brushless DC fans and dual-coil motors. It integrates a Hall plate, amplifier, comparator, voltage regulator, protection diode, and open-collector DO/DOB outputs. Key specs: ±50 G operate/release points (B grade), 3.5–20 V supply, -20°C to +85°C operation, SIP-4L package, and 400 mA continuous output current.
For engineers reviewing the AH276Q-PL-B-B datasheet, AH276Q-PL-B-B pinout, AH276Q-PL-B-B application in BLDC fan commutation, or AH276Q-PL-B-B equivalent for magnetic latching sensing, this page delivers verified functional identity, validated pin roles, confirmed B-grade magnetic thresholds, thermal derating curves, and RoHS-compliant green packaging details.
Technical Context
The AH276Q-PL-B-B implements a bipolar latching Hall sensor with hysteresis of 75 G, enabling stable state retention until magnetic flux crosses Brp (−50 G min) or Bop (+50 G max). Its complementary open-collector outputs (DO low / DOB high when B > Bop) provide direct drive capability for external NPN/PNP transistor pairs in motor phase control.
Internal regulation supports wide 3.5–20 V supply range, while the integrated reverse-polarity protection diode safeguards only the IC side-not the coil side-requiring external diode addition for full system-level reverse-current blocking in fan applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 20 V - enables direct use with 5 V, 12 V, or 24 V fan power rails without external regulation |
| Operating Temperature | −20°C to +85°C - qualified for industrial and consumer fan environments |
| Magnetic Bop / Brp (B grade) | +5 G to +70 G / −70 G to −5 G - provides robust latching margin against mechanical vibration and field drift |
| Output Current (Continuous) | 400 mA - drives standard small-signal transistors or logic-level MOSFET gates directly |
| Package Thermal Resistance | θJA = 227°C/W - requires minimal PCB copper area for thermal management at ≤550 mW dissipation |
| Output Saturation Voltage | 0.6 V typ @ 400 mA - ensures low conduction loss and compatible with TTL/CMOS input thresholds |
| Supply Current | 7–25 mA - enables low-power standby operation in always-on fan control circuits |
Pinout & Package
SIP-4L (Single In-line Package, 4-pin, lead-free, green molding compound) with 1.95 mm pin pitch and 5.22 mm body length. Pin 1 (VCC) and Pin 4 (GND) define the power rail; Pins 2 and 3 deliver complementary digital outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power Supply Input | Accepts 3.5–20 V; powers internal regulator, Hall sensor, and output drivers |
| 2: DO | Complementary Output A | Open-collector, active-low output; sinks current when B > Bop |
| 3: DOB | Complementary Output B | Open-collector, active-high output; sources current when B < Brp |
| 4: GND | Ground Reference | Common return path for supply and output loads; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Stable state retention without external feedback; eliminates need for microcontroller polling in fan commutation |
| Integrated reverse-polarity protection diode | Protects IC-side circuitry from accidental VCC reversal-but not coil-side back-EMF; external diode required for full system safety |
| B-grade magnetic sensitivity | Optimized for ±50 G typical switching thresholds-ideal for compact fan rotor magnets with limited air-gap flux density |
| Lead-free, halogen-free "Green" package | SIP-4L meets RoHS 2 (2011/65/EU) and Diodes Inc.'s <900 ppm Br/Cl, <1000 ppm Sb requirements |
| Thermal derating curve provided | Power dissipation linearly reduces from 550 mW at 25°C to 0 mW at 150°C-enables accurate ambient temperature margining |
Applications
| Brushless DC Fan Commutation | Dual-Coil Motor Control |
|---|---|
Use Scenario: Electronic commutation of 2-phase, 4-pole BLDC fans in servers and telecom equipment. IC Role / Device Role / Timing Role: Hall latch providing rotor position feedback to drive external H-bridge transistors with precise 180° phase alignment. Use Value: Eliminates mechanical brushes and enables >50,000-hour fan life with consistent speed regulation across temperature. | Use Scenario: Directional control of small dual-winding DC motors in HVAC dampers and actuator modules. IC Role / Device Role / Timing Role: Magnetic state detector generating complementary enable signals for forward/reverse winding energization. Use Value: Reduces component count by replacing discrete Hall sensors + logic gates; supports bidirectional rotation with single IC. |
| Revolution Counting | Speed Measurement |
Use Scenario: Monitoring rotational cycles of cooling fans for predictive maintenance alerts in industrial PLC cabinets. IC Role / Device Role / Timing Role: Digital edge generator synchronized to magnet passage-each pole pair produces one DO/DOB toggle cycle. Use Value: Enables accurate RPM calculation using microcontroller timer capture without signal conditioning or debouncing. | Use Scenario: Real-time fan speed feedback in closed-loop thermal management systems for CPU/GPU coolers. IC Role / Device Role / Timing Role: Pulse train source with fixed duty cycle derived from rotor pole count and angular velocity. Use Value: Delivers jitter-free frequency output proportional to RPM-compatible with standard counter/timer peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH276Z4-AG1 | Successor part with identical SIP-4L footprint, same B-grade magnetic thresholds, but enhanced ESD rating (±4 kV HBM) and updated green compound formulation | Drop-in replacement for new designs; supports same fan commutation and counting functions | Select for new production-AH276Z4-AG1 maintains full functional compatibility while offering improved robustness and lifecycle availability |
| US1881 | Single-output Hall latch (DO only); no complementary DOB; operates from 3–24 V; Bop/Brp ±30 G typical; TO-92 package | Requires external inverter for complementary output; unsuitable for direct dual-transistor drive without added components | Consider only if board space allows TO-92 and design can accommodate discrete inversion logic |
Compared with AH276Z4-AG1, the AH276Q-PL-B-B lacks updated ESD protection and has discontinued status, while US1881 sacrifices complementary output integration-making AH276Q-PL-B-B uniquely suited for legacy fan designs requiring matched DO/DOB timing without external logic.
Availability
AH276Q-PL-B-B is available at Aetrix Electronics and suitable for brushless DC fan commutation, dual-coil motor control, revolution counting, and speed measurement applications requiring stable component supply during end-of-life transition phases.
Supply support for AH276Q-PL-B-B 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 sensing solutions for industrial, computing, and consumer markets.
The AH276 product line targets cost-sensitive, high-volume motion sensing applications-specifically electronic commutation in brushless DC fans-where integrated regulation, complementary outputs, and SIP-4L manufacturability reduce total BOM cost and assembly complexity.
FAQ
Is AH276Q-PL-B-B still in production?
No-AH276Q-PL-B-B is officially obsolete per Diodes Incorporated's documentation (DS31066 Rev. 7-4, Feb 2019). It has been superseded by AH276Z4-AG1. Aetrix Electronics maintains limited legacy stock for continuity support but does not accept new production orders beyond existing inventory.
What does the "B" suffix in AH276Q-PL-B-B indicate?
The final "B" denotes B-grade magnetic characteristics: operate point (Bop) of +5 G to +70 G and release point (Brp) of −70 G to −5 G, with 75 G hysteresis. This grade balances sensitivity and noise immunity for standard fan rotor magnets operating at typical air gaps.
Can AH276Q-PL-B-B drive a MOSFET gate directly?
Yes-its 400 mA continuous output current and 0.6 V typical saturation voltage allow direct connection to logic-level N-channel MOSFET gates (e.g., Si2302, DMN2004) without series resistors, provided gate charge and switching frequency remain within safe SOA limits.
Why is an external diode needed despite the internal protection diode?
The internal diode protects only the IC's VCC pin from reverse polarity-it does not block reverse current induced by motor coil back-EMF during deceleration. An external flyback diode across the coil is mandatory to prevent damage to both the AH276Q-PL-B-B and driving transistors.
AH276Q-PL-B-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- 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):
- 25mA
- Current - Output (Max):
- 400mA
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 4-SIP
AH276Q-PL-B-B FAQ
1.How can I place an order for AH276Q-PL-B-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH276Q-PL-B-B 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 AH276Q-PL-B-B reliable?
The price and inventory of AH276Q-PL-B-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH276Q-PL-B-B is usually 5 days.
3.What payment methods are accepted for AH276Q-PL-B-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH276Q-PL-B-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH276Q-PL-B-B?
AH276Q-PL-B-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH276Q-PL-B-B 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 AH276Q-PL-B-B?
For technical support, including AH276Q-PL-B-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH276Q-PL-B-B requirements.
6.How does Aetrix verify that AH276Q-PL-B-B is sourced from the original manufacturer or authorized distributors?
All AH276Q-PL-B-B 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 AH276Q-PL-B-B meets industry standards.
7.What is the process for return or replacement of AH276Q-PL-B-B?
All AH276Q-PL-B-B units undergo pre-shipment inspection (PSI). If there is an issue with AH276Q-PL-B-B, 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 AH276Q-PL-B-B part is unused and in its original packaging.
Return procedure for AH276Q-PL-B-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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