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Diodes Incorporated AH3574-P-B
- Part No.:
- AH3574-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3574-P-B.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
AH3574-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect omnipolar switch IC in SIP-3 (Bulk Pack) package, operating from 3.0V to 28V supply, with ±40G typical operate point (BOP), ±25G typical release point (BRP), and -40°C to +125°C temperature range-designed for non-contact position sensing in industrial flow meters and appliance door-open detection.
For engineers reviewing the AH3574-P-B datasheet, AH3574-P-B pinout, AH3574-P-B application, or AH3574-P-B equivalent, this device delivers chopper-stabilized magnetic switching with reverse battery protection, Zener clamping on VDD and output, open-drain output current limiting (30–55 mA), and robust ESD immunity (>6 kV HBM) for reliable operation in noisy, wide-voltage environments.
Technical Context
The AH3574 employs dynamic offset cancellation via chopper stabilization at 800 kHz, enabling minimal switch-point drift (<±15 G hysteresis) across -40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring stable BOP/BRP thresholds independent of VDD variation.
It integrates reverse-blocking diode and Zener clamps on both VDD and OUTPUT pins, supporting fault-tolerant operation under reverse-battery (-28 V) and overvoltage transients. The single open-drain output features active current limiting (IOCL = 30–55 mA) and low saturation voltage (VOUT_ON ≤ 0.4 V @ 20 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 28 V - supports direct connection to 24 V industrial rails without external regulation |
| Omnipolar Operate Point (BOP) | ±40 G typical - activates with either North or South pole, simplifying magnet placement |
| Hysteresis (BHY) | 15 G typical - prevents chatter near threshold in vibrating or noisy mechanical environments |
| Output Type | Open-drain with 60 mA continuous rating - compatible with standard pull-up resistors and microcontroller GPIO inputs |
| ESD Rating | >6 kV HBM - withstands handling and board-level electrostatic discharge without protection circuitry |
| Startup Time | 10 µs typical - enables fast response in real-time proximity monitoring applications |
| Chopping Frequency | 800 kHz - suppresses low-frequency noise and offsets while maintaining sub-µs response latency |
Pinout & Package
Package: SIP-3 (Bulk Pack), straight-lead, surface-mount package with 1.5 mm body width, 14.5 mm length, and 3.0 mm width - optimized for automated insertion and high-density PCB layouts in industrial sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and 28 V Zener clamp - tolerates -28 V reverse battery and transient overvoltage |
| 2 | GND | Ground reference for internal regulator and Hall sensor - shared return path for all analog and digital blocks |
| 3 | OUTPUT | Open-drain N-channel output with 30–55 mA current limit and 28 V Zener clamp - drives external pull-up to logic-high or sinks load directly |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensitivity | Activates with either pole orientation - eliminates need for magnet polarity alignment during assembly |
| Chopper-stabilized architecture | 800 kHz modulation reduces thermal drift and 1/f noise - maintains ±25 G BRP stability over full temperature range |
| Integrated reverse-battery protection | Withstands -28 V applied to VDD - protects downstream circuitry in automotive or field-service scenarios |
| Zener clamping on VDD and OUTPUT | Clamps transients to ≤28 V - avoids external TVS diodes in cost-sensitive industrial designs |
| Wide operating temperature range | -40°C to +125°C ambient - qualified for use inside sealed motor housings and HVAC control modules |
Applications
| Appliance Door Detection | Industrial Flow Meter Sensing |
|---|---|
|
Use Scenario: Detect open/closed state of refrigerator, washing machine, or oven doors without physical contact. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing clean, bounce-free digital signal to MCU upon magnet proximity change. Use Value: Eliminates mechanical switch wear and false triggers from vibration due to 15 G hysteresis and chopper noise rejection. |
Use Scenario: Sense rotation of turbine blades or paddle wheels in water/gas flow meters. IC Role / Device Role / Timing Role: Magnetic threshold detector triggering pulse output per revolution for flow rate calculation. Use Value: 10 µs startup time and 3.75 µs response delay enable accurate high-speed counting up to ~100 kHz. |
| Building Automation Position Sensing | Contactless Level Switch |
|
Use Scenario: Monitor damper or valve position in HVAC ducts using embedded magnets. IC Role / Device Role / Timing Role: Proximity sensor interfacing directly with PLC I/O modules via open-drain output. Use Value: 3.0–28 V supply range allows direct integration into 24 V DC control systems without level-shifting. |
Use Scenario: Detect liquid level in tanks via float-mounted magnet passing fixed sensor location. IC Role / Device Role / Timing Role: Threshold-triggered switch signaling fill/empty states to safety controller. Use Value: ±40 G BOP ensures reliable activation even with low-strength ferrite magnets and air gaps up to 4 mm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar omnipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3505-30D | Narrower supply range (2.5–24 V); lower BOP (±30 G); no reverse-battery rating | Limited to low-voltage consumer electronics; unsuitable for 28 V industrial rails or reverse-polarity environments | Select when cost is critical and system operates strictly within 24 V with controlled polarity. |
| US1881EUA-AMI | Higher BOP (±50 G); no Zener clamp on output; 50 mA IOCL only | Better for weak-field sensing but lacks output overvoltage protection needed in noisy industrial wiring | Prefer where magnetic field strength is marginal but system-level transient suppression is already implemented. |
Compared with AL3505-30D and US1881EUA-AMI, the AH3574-P-B uniquely combines 28 V operation, reverse-battery tolerance, dual Zener clamping, and ±40 G sensitivity-making it the only choice for unregulated 24 V industrial sensing with field-reversal risk and minimal external protection.
Availability
AH3574-P-B is available at Aetrix Electronics and suitable for industrial flow metering, appliance door detection, HVAC damper position feedback, and contactless tank level monitoring requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3574-P-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.
The AH3574 belongs to Diodes' Hall-effect sensor product line, engineered for robust, maintenance-free position and proximity sensing in harsh environments where reliability and wide supply range are critical.
FAQ
What is the maximum allowable reverse voltage on the VDD pin?
The AH3574-P-B incorporates an internal reverse-blocking diode and is rated for -28 V reverse supply voltage across the full operating temperature range (-40°C to +125°C). This allows safe operation in automotive or field-service scenarios where battery polarity may be inadvertently reversed, without requiring external protection components.
Does the AH3574-P-B require an external capacitor on the VDD pin?
Yes - a 10 nF to 100 nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND, placed as close as possible to the SIP-3 package. This stabilizes the internal bandgap regulator, improves noise immunity, and ensures reliable start-up within the specified 10 µs typical power-on time.
Can the AH3574-P-B drive an LED directly?
No - the AH3574-P-B has an open-drain output with 60 mA continuous current rating, but its output saturation voltage rises above 0.4 V at 20 mA. Driving an LED typically requires >1.8 V forward drop and stable current control; a dedicated driver or current-limiting resistor + external transistor is required for reliable LED indication.
Is the SIP-3 (Bulk Pack) variant pin-compatible with the SOT23 version?
No - AH3574-P-B (SIP-3 Bulk Pack) uses a 3-pin inline configuration (VDD-GND-OUTPUT), while AH3574-SA-7 (SOT23) follows standard SOT-23 pinout (VDD-OUTPUT-GND). Layouts, footprints, and PCB assembly processes differ; they are not mechanically or electrically interchangeable without redesign.
AH3574-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT Trip, ±1mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 55mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3574-P-B FAQ
1.How can I place an order for AH3574-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3574-P-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 AH3574-P-B reliable?
The price and inventory of AH3574-P-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3574-P-B is usually 5 days.
3.What payment methods are accepted for AH3574-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3574-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3574-P-B?
AH3574-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3574-P-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 AH3574-P-B?
For technical support, including AH3574-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3574-P-B requirements.
6.How does Aetrix verify that AH3574-P-B is sourced from the original manufacturer or authorized distributors?
All AH3574-P-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 AH3574-P-B meets industry standards.
7.What is the process for return or replacement of AH3574-P-B?
All AH3574-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3574-P-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 AH3574-P-B part is unused and in its original packaging.
Return procedure for AH3574-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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