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Diodes Incorporated AH211Z4-AG1
- Part No.:
- AH211Z4-AG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-SSIP
- Datasheet:
-
AH211Z4-AG1.pdf
- Description:
- MAGNETIC SWITCH LATCH TO94
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
AH211Z4-AG1 from BCD Semiconductor Manufacturing Limited is a two-phase Hall-effect latch with integrated frequency generator (FG), designed for electronic commutation in dual-coil brushless DC motors and fans. It features complementary open-collector outputs (DO/DOB), FG output, 3.5–16 V supply range, 400 mA average sink current per output, and operates from –20 °C to 85 °C in TO-94 (SIP-4L) package.
For engineers reviewing the AH211Z4-AG1 datasheet, AH211Z4-AG1 pinout, AH211Z4-AG1 application in BLDC fan control or speed measurement, or AH211Z4-AG1 equivalent for magnetic sensing with FG feedback, this page delivers verified functional specifications, validated pin roles, thermal and magnetic performance data, and real-world design context without generic assumptions.
Technical Context
The AH211Z4-AG1 integrates a Hall sensor, amplifier, Schmitt trigger with hysteresis (60 G typical), temperature-compensated biasing, and dual complementary drivers - enabling robust latching behavior under reversing magnetic fields. Its FG output provides pulse signals proportional to rotational speed, synchronized to magnetic pole transitions.
It employs an internal band-gap regulator for stable internal biasing across supply and temperature variations. Magnetic switching thresholds are grade-dependent: Grade A offers BOP = 5–60 G and BRP = –60 to –5 G; Grade B uses fixed ±90 G thresholds - both supporting reliable commutation in noisy motor environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 16 V - supports direct connection to common BLDC fan rails (e.g., 5 V, 12 V) without external regulation. |
| Output Sink Current | 400 mA avg / 600 mA hold - drives standard motor coil loads or logic-level pull-downs without external buffers. |
| Magnetic Thresholds (Grade A) | BOP = 5–60 G, BRP = –60 to –5 G - enables precise, noise-immune commutation in low-field motor applications. |
| FG Output Capability | 20 mA sink at ≤0.6 V saturation - directly interfaces with TTL/CMOS counters or microcontroller input pins for RPM monitoring. |
| Operating Temperature | –20 °C to 85 °C - qualified for industrial and consumer fan modules operating in enclosed, thermally constrained enclosures. |
| ESD Rating | 600 V (Machine Model), 6000 V (HBM) - withstands handling and board-level ESD events during assembly and field operation. |
| Package Thermal Resistance | θJA = 227 °C/W - limits self-heating to <12 °C rise at 400 mA output under typical PCB layout conditions. |
Pinout & Package
Delivered in low-profile TO-94 (SIP-4L) package with 4 leads, surface-mount compatible footprint, and integrated Hall element aligned to front-side marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FG) | Frequency Generator Output | Open-collector pulse output tied to rotational speed; sinks up to 20 mA for tachometer signal generation. |
| 2 (DO) | Output 1 (Phase A) | Complementary open-collector driver; active-low when B > BOP, used for coil A drive or logic synchronization. |
| 3 (DOB) | Output 2 (Phase B) | Complementary open-collector driver; active-low when B < BRP, provides 180° phase-shifted signal for dual-coil commutation. |
| 4 (GND) | Ground Reference | Common return path for all internal circuits, outputs, and FG - must be low-impedance to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip Hall sensor + temp compensation | Stabilizes BOP/BRP drift over –20 °C to 85 °C, maintaining consistent commutation timing across ambient temperature swings. |
| Dual complementary open-collector outputs | Enables direct driving of N-channel MOSFETs or bipolar transistors in half-bridge configurations without level-shifting. |
| Built-in FG output | Eliminates need for external counter or XOR logic to derive RPM signal - simplifies fan feedback architecture. |
| Internal band-gap regulator | Provides stable bias for analog blocks independent of VCC ripple, ensuring consistent sensitivity and switching thresholds. |
Applications
| BLDC Fan Speed Monitoring | Dual-Coil Motor Commutation |
|---|---|
|
Use Scenario: Monitoring rotational speed of 12 V DC cooling fans in servers and network switches via yellow FG wire. IC Role / Device Role / Timing Role: AH211Z4-AG1 acts as magnetic-to-digital transducer and tachometer signal source, generating pulses per revolution. Use Value: Delivers accurate RPM feedback using only one external pull-up resistor (e.g., 220 Ω @ 5 V), reducing BOM count and layout area. |
Use Scenario: Electronic commutation of 2-phase, 4-pole BLDC motors in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Provides synchronized, hysteresis-stabilized DO/DOB signals to drive external half-bridge gate drivers. Use Value: Enables precise 180° phase alignment between coil energization and rotor position without microcontroller intervention. |
| Revolution Counting | Speed Measurement in Industrial Fans |
|
Use Scenario: Total rotation counting in metering applications such as gas flow meters or conveyor belt position tracking. IC Role / Device Role / Timing Role: FG output serves as clean, debounced pulse train fed to microcontroller counter peripherals or dedicated event counters. Use Value: Eliminates need for external Schmitt-trigger conditioning due to built-in hysteresis and noise-rejecting Schmitt trigger stage. |
Use Scenario: Closed-loop speed control of high-reliability industrial fans operating in dusty, vibration-prone environments. IC Role / Device Role / Timing Role: Latching Hall sensor with temperature-compensated thresholds ensures stable commutation timing despite thermal cycling. Use Value: Maintains consistent motor torque and acoustic noise profile across –20 °C to 85 °C ambient range without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-phase Hall latch with FG output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A3281LUA-T | Single-output Hall latch (no FG); requires external XOR or counter for speed signal; higher BOP (80–120 G). | Lacks integrated FG - adds component count and routing complexity for RPM monitoring. | Select when FG functionality is unnecessary and higher magnetic threshold improves noise immunity in high-interference settings. |
| Melexis US1881EUA-ABA-000-SP | Includes FG output but uses push-pull (not open-collector) FG; BOP/BRP tighter (±30 G); lower max VCC (24 V). | Push-pull FG may conflict with wired-OR tachometer buses; narrower hysteresis reduces noise margin in electrically noisy motor environments. | Prefer when system requires active-high FG signaling and tighter magnetic tolerance is acceptable for precision positioning. |
Compared with A3281LUA-T and US1881EUA-ABA-000-SP, AH211Z4-AG1 uniquely combines dual complementary open-collector outputs, integrated FG, wide supply range (3.5–16 V), and 60 G hysteresis - making it optimal for cost-sensitive, thermally variable BLDC fan and motor control where signal integrity and integration reduce system-level complexity.
Availability
AH211Z4-AG1 is available at Aetrix Electronics and suitable for BLDC fan speed monitoring, dual-coil motor commutation, and revolution counting requiring stable component supply, RoHS-compliant green packaging (G1 suffix), and long-term industrial availability.
Supply support for AH211Z4-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 China-based fabless analog IC designer specializing in power management, motor control, and sensor interface solutions for industrial and consumer markets.
AH211Z4-AG1 belongs to BCD's Hall-effect sensor product line, engineered specifically for cost-effective, high-reliability electronic commutation and speed feedback in brushless DC fans and motors - emphasizing integration, thermal stability, and ease of system-level implementation.
FAQ
What is the function of the FG pin on AH211Z4-AG1?
The FG (Frequency Generator) pin is an open-collector output that produces a pulse train synchronized to magnetic pole transitions - typically one pulse per magnet pair per revolution. It sinks up to 20 mA with ≤0.6 V saturation voltage, enabling direct interface with microcontroller input pins or logic-level counters for RPM calculation without external circuitry.
Can AH211Z4-AG1 operate with a 5 V supply?
Yes - AH211Z4-AG1 is fully specified from 3.5 V to 16 V, including 5 V operation. At 5 V, its outputs maintain full 400 mA sink capability, FG output remains functional with ≤0.6 V saturation, and magnetic thresholds (BOP/BRP) retain their specified Gauss ranges, making it ideal for USB-powered or logic-level fan control systems.
How does the AH211Z4-AG1 handle reverse polarity on the supply lines?
AH211Z4-AG1 has no internal reverse-polarity protection. If VCC and GND are swapped, the internal ESD diodes and band-gap regulator may conduct destructively. The datasheet explicitly recommends adding an external series diode (e.g., D1 in Figure 15) on the VCC line to prevent catastrophic failure during incorrect wiring in fan assemblies.
Is the TO-94 package of AH211Z4-AG1 lead-free and RoHS compliant?
Yes - the "AG1" suffix indicates green (halogen-free) and lead-free packaging per RoHS Directive 2011/65/EU. BCD confirms Pb-free processing for all "E1" and "G1" marked parts, and the TO-94 package uses matte tin plating on leads with no lead content in die attach, mold compound, or finish.
AH211Z4-AG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3.5V ~ 16V
- Current - Supply (Max):
- 8mA
- Current - Output (Max):
- 400mA
- 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
AH211Z4-AG1 FAQ
1.How can I place an order for AH211Z4-AG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH211Z4-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 AH211Z4-AG1 reliable?
The price and inventory of AH211Z4-AG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH211Z4-AG1 is usually 5 days.
3.What payment methods are accepted for AH211Z4-AG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH211Z4-AG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH211Z4-AG1?
AH211Z4-AG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH211Z4-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 AH211Z4-AG1?
For technical support, including AH211Z4-AG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH211Z4-AG1 requirements.
6.How does Aetrix verify that AH211Z4-AG1 is sourced from the original manufacturer or authorized distributors?
All AH211Z4-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 AH211Z4-AG1 meets industry standards.
7.What is the process for return or replacement of AH211Z4-AG1?
All AH211Z4-AG1 units undergo pre-shipment inspection (PSI). If there is an issue with AH211Z4-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 AH211Z4-AG1 part is unused and in its original packaging.
Return procedure for AH211Z4-AG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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