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Diodes Incorporated AH276Z4-BG1
- Part No.:
- AH276Z4-BG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH276Z4-BG1.pdf
- Description:
- MAGNETIC SWITCH LATCH TO94
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
AH276Z4-BG1 from BCD Semiconductor Manufacturing Limited is a complementary-output Hall-effect latch IC designed for electronic commutation in brushless DC motors. It integrates a Hall sensor, amplifier, Schmitt trigger with hysteresis, temperature compensation, band-gap regulator, and dual open-collector drivers-supporting 3.5–16 V supply, ±20 °C to +85 °C operation, and 350 mA average sink current per output. Used in dual-coil BLDC fans and motor timing circuits.
For engineers reviewing the AH276Z4-BG1 datasheet, AH276Z4-BG1 pinout, AH276Z4-BG1 application, or AH276Z4-BG1 equivalent, key selection criteria include magnetic operating/releasing points (BOP/BRP), complementary output timing symmetry, thermal shutdown threshold (178 °C), reverse-voltage protection (−20 V), and TO-94 SIP-4L mechanical compatibility in space-constrained motor control PCBs.
Technical Context
The AH276Z4-BG1 implements a bipolar latching Hall sensor with built-in hysteresis (75 G typical) to reject noise during magnetic field transitions. Its dual open-collector outputs (DO and DOB) provide true complementary switching: DO sinks when flux exceeds BOP, DOB sinks when flux falls below BRP-enabling direct drive of two-phase motor coils without external logic inversion.
Internal temperature compensation maintains stable BOP/BRP across −20 °C to +85 °C ambient, while the integrated band-gap regulator ensures consistent biasing independent of VCC variation. Over-temperature protection triggers at 178 °C with 40 °C hysteresis, and reverse-supply protection withstands −20 V applied to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 16 V - supports wide-input industrial and automotive 12 V systems without external regulation |
| Output Sink Current | 350 mA avg / 750 mA peak - directly drives motor coil loads up to ~470 Ω at 14 V without external transistors |
| Magnetic BOP/BRP | ±5 to ±70 G (Grade B) - enables reliable switching with common ferrite magnets at air gaps ≤1.5 mm |
| Output Rise/Fall Time | 3.0–10 µs / 0.3–1.5 µs (RL=820 Ω, CL=20 pF) - ensures clean edge timing for motor phase sequencing up to ~100 kHz |
| Thermal Shutdown | 178 °C activation with 40 °C hysteresis - prevents latch damage during sustained overload or stalled-rotor conditions |
| ESD Rating | 300 V (Machine Model), 2500 V (HBM) - meets basic handling requirements for automated assembly lines |
| Operating Temperature | −20 °C to +85 °C - validated for fan and pump applications in enclosed industrial enclosures |
Pinout & Package
Package: TO-94 (SIP-4L), 4-pin single-inline package with 2.54 mm pitch, low-profile (5.28 mm height), lead-free and green-compliant (G1 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Bias source for internal regulator, amplifier, and driver stages; accepts 3.5–16 V with reverse-protection diode |
| 2 - DO | Complementary output 1 | Open-collector NPN output; sinks current when magnetic flux > BOP (e.g., North pole present) |
| 3 - DOB | Complementary output 2 | Open-collector NPN output; sinks current when magnetic flux < BRP (e.g., South pole present) |
| 4 - GND | Ground reference | Common return for internal circuits and external load paths; must be low-impedance for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall sensing + signal conditioning | Eliminates need for external sensor, op-amp, and comparator in BLDC rotor position detection |
| Complementary open-collector outputs | Enables direct push-pull-like coil driving with only two external pull-up resistors and no logic inversion |
| On-chip temperature compensation | Maintains ±15% BOP/BRP stability over full −20 °C to +85 °C range-critical for fan speed consistency |
| Reversed supply voltage protection | Withstands −20 V on VCC without damage-prevents field failure during battery polarity misconnection |
| Over-temperature shutdown | Auto-recovers after cooldown; protects against thermal runaway during locked-rotor or high-ambient conditions |
Applications
| Brushless DC Motor Commutation | Dual-Coil Fan Control |
|---|---|
Use Scenario: Rotor position sensing in 2-phase, 3-wire BLDC motors used in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Latching Hall sensor providing synchronized, hysteresis-stabilized phase enable signals to external half-bridge drivers. Use Value: Enables precise 120° electrical commutation with <10 µs output delay matching, reducing torque ripple vs. non-latching alternatives. |
Use Scenario: Speed-regulated cooling fans in network switches and industrial PLCs requiring silent, reliable airflow. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector feeding tachometer counter and PWM feedback loop. Use Value: Dual outputs allow simultaneous direction sensing and RPM counting using one IC-reducing BOM count by one Hall sensor. |
| Revolution Counting | Speed Measurement |
Use Scenario: Bidirectional rotation monitoring in conveyor belt encoders and metering pumps. IC Role / Device Role / Timing Role: Edge-triggered magnetic event counter with polarity discrimination via DO/DOB state pairing. Use Value: Eliminates need for XOR logic or microcontroller GPIO interrupts-direct connection to counter IC inputs. |
Use Scenario: Real-time RPM calculation in automotive radiator fans and medical centrifuges. IC Role / Device Role / Timing Role: High-fidelity pulse generator with <1.5 µs fall time ensuring accurate period measurement up to 100 kHz. Use Value: Sub-microsecond timing resolution enables ±0.5% speed accuracy at 3000 RPM without oversampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A3281LUA-T | Single-ended output, higher BOP (25–110 G), no integrated thermal shutdown | Requires external inverter for complementary drive; lacks auto-recovery thermal protection | Preferred where board space allows discrete inversion and thermal monitoring is handled system-wide |
| Melexis US1881EUA-ABA-000-SP | Complementary outputs, wider temp range (−40 °C to +150 °C), higher ESD (4 kV HBM) | Higher cost; overqualified for 85 °C fan applications but suitable for under-hood automotive use | Select when extended temperature or automotive qualification (AEC-Q100) is mandatory |
Compared with A3281LUA-T and US1881EUA-ABA-000-SP, AH276Z4-BG1 delivers optimal balance of complementary drive capability, thermal safety, and cost for industrial BLDC fans-offering integrated protection and proven reliability in TO-94 form factor without over-specifying for non-automotive environments.
Availability
AH276Z4-BG1 is available at Aetrix Electronics and suitable for brushless DC motor commutation, dual-coil fan control, and revolution counting applications requiring stable component supply, RoHS-compliant green packaging, and long-term industrial lifecycle support.
Supply support for AH276Z4-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 Shanghai-based analog and mixed-signal IC designer and foundry partner, specializing in high-reliability power management, Hall-effect sensors, and motor control solutions for industrial and consumer markets.
AH276Z4-BG1 belongs to BCD's Hall-effect latch product line, engineered specifically for cost-sensitive, high-volume BLDC motor timing and position feedback-emphasizing integration, thermal robustness, and mechanical compatibility with legacy TO-94 footprints.
FAQ
What is the magnetic sensitivity grade of AH276Z4-BG1?
AH276Z4-BG1 uses Grade B magnetic characteristics: BOP = +5 to +70 G and BRP = −70 to −5 G at 25 °C, with 75 G typical hysteresis. This grade is optimized for use with standard ferrite magnets in fan and motor applications where moderate air gap tolerance and noise immunity are required.
Can AH276Z4-BG1 drive motor coils directly without external transistors?
Yes-each output sinks up to 350 mA continuously (750 mA peak), enabling direct drive of typical BLDC fan coils (e.g., 470 Ω @ 14 V yields ~30 mA; lower-resistance coils require external limiting resistors). For >350 mA loads, external NPN/MOSFET buffers are recommended.
Does AH276Z4-BG1 require external pull-up resistors on DO and DOB?
Yes-both DO and DOB are open-collector outputs and require external pull-up resistors to VCC. Typical values are 820 Ω (per Figure 6 test circuit), selected to ensure <10 µs rise time while limiting power dissipation during active sinking.
Is AH276Z4-BG1 compatible with lead-free reflow soldering processes?
Yes-AH276Z4-BG1 carries the "G1" suffix indicating green, lead-free packaging compliant with JEDEC J-STD-020D moisture sensitivity level 3 and RoHS Directive 2011/65/EU. Peak reflow temperature is rated to 260 °C for 10 seconds.
AH276Z4-BG1 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 ~ 16V
- Current - Supply (Max):
- 16mA
- Current - Output (Max):
- 350mA
- Output Type:
- Open Collector
- Features:
- Temperature Compensated
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-94
AH276Z4-BG1 FAQ
1.How can I place an order for AH276Z4-BG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH276Z4-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 AH276Z4-BG1 reliable?
The price and inventory of AH276Z4-BG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH276Z4-BG1 is usually 5 days.
3.What payment methods are accepted for AH276Z4-BG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH276Z4-BG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH276Z4-BG1?
AH276Z4-BG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH276Z4-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 AH276Z4-BG1?
For technical support, including AH276Z4-BG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH276Z4-BG1 requirements.
6.How does Aetrix verify that AH276Z4-BG1 is sourced from the original manufacturer or authorized distributors?
All AH276Z4-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 AH276Z4-BG1 meets industry standards.
7.What is the process for return or replacement of AH276Z4-BG1?
All AH276Z4-BG1 units undergo pre-shipment inspection (PSI). If there is an issue with AH276Z4-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 AH276Z4-BG1 part is unused and in its original packaging.
Return procedure for AH276Z4-BG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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