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Diodes Incorporated AH1902-FA-7
- Part No.:
- AH1902-FA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
AH1902-FA-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,507
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Product details
Overview
AH1902-FA-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in X1-DFN1216-4 package, operating from 1.6V to 3.6V with 4.3μA average supply current at 1.8V and ±23G typical operate point (Bop) for both north and south poles. It integrates internal pull-up/pull-down, uses chopper stabilization for thermal stability, and targets battery-powered portable electronics requiring contactless position sensing.
For engineers reviewing the AH1902-FA-7 datasheet, AH1902-FA-7 pinout, AH1902-FA-7 application, or AH1902-FA-7 equivalent, this device delivers ultra-low-power magnetic switching with guaranteed hysteresis (10G), RF noise immunity, and -40°C to +85°C operation - critical for flip-phone detection, smart cover sensing, and industrial proximity switches where PCB space and battery life are constrained.
Technical Context
The AH1902 employs a chopper-stabilized Hall plate with offset cancellation and sleep/awake logic to achieve <0.1μA leakage and 100μs awake time. Its hibernating clocking system cycles between active sampling (50–100μs) and deep sleep (50–100ms), enabling 4.3μA average current at 1.8V.
Omnipolar latching behavior is implemented via dual magnetic thresholds: Bopn/Bops (±23G typ.) and Brpn/Brps (±12G typ.), delivering 10G hysteresis. Output is open-drain, actively pulled low when triggered, with VOL = 0.2V max at 1mA sink - compatible with 1.8V logic interfaces without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 3.6V - supports single-cell Li-ion, NiMH, and coin-cell batteries without regulation. |
| Average Supply Current | 4.3μA at 1.8V - enables multi-year battery life in always-on sensing applications. |
| Omnipolar Operate Point (Bop) | ±23G typ. - activates with either magnetic pole, simplifying mechanical design of magnets and mounting. |
| Hysteresis (Bhy) | 10G - prevents chatter near threshold and ensures stable output during slow field transitions. |
| Output Type | Open-drain, active-low - directly interfaces with microcontroller GPIOs; no external pull-up required. |
| Operating Temperature | -40°C to +85°C - qualified for consumer, industrial, and automotive cabin environments. |
| ESD Rating | 8kV HBM - withstands handling and assembly stress without protection circuitry. |
Pinout & Package
X1-DFN1216-4 is a 1.2mm × 1.6mm, 0.5mm pitch, low-profile 4-pin DFN package with exposed thermal pad (unconnected). Pin 1 is OUTPUT, Pin 2 is GND, Pin 3 is NC (no internal connection), Pin 4 is VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTPUT) | Open-drain output | Drives low when magnetic field exceeds Bop; requires external pull-up only if interfacing with higher-voltage logic. |
| 2 (GND) | Ground reference | Return path for supply and output current; must be low-impedance for stable switching. |
| 3 (NC) | No connection | Internally unconnected; may be left floating or tied to GND for mechanical stability. |
| 4 (VDD) | Power supply input | Accepts 1.6–3.6V; decoupling capacitor (100nF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic activation | Eliminates magnet polarity orientation constraints in mechanical assemblies - reduces BOM and assembly cost. |
| Chopper-stabilized architecture | Reduces temperature-induced switch-point drift to ±1G/°C, ensuring consistent performance across -40°C to +85°C. |
| Integrated pull-up/pull-down capability | Removes need for external resistors, saving PCB area and reducing component count in space-constrained designs. |
| Hibernating clocking system | Dynamically adjusts sampling duty cycle (0.1% typical), achieving 4.3μA avg. current without sacrificing response latency. |
| RF noise immunity | Validated against common cellular and Wi-Fi band interference - prevents false triggers in smartphones and tablets. |
Applications
| Flip/Slide Phone Detection | Smart Cover Sensing |
|---|---|
|
Use Scenario: Detect lid open/close state in clamshell mobile phones using embedded magnet and PCB-mounted AH1902-FA-7. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing latched ON/OFF signal to baseband processor upon magnetic field crossing Bop/Brp thresholds. Use Value: Enables instant wake-from-sleep on lid opening and power-off on closing - extending standby battery life by eliminating polling. |
Use Scenario: Sense attachment/detachment of magnetic smart covers on tablets and ultrabooks. IC Role / Device Role / Timing Role: Contactless position detector generating interrupt-capable output to SoC GPIO, synchronized with cover motion. Use Value: Eliminates mechanical wear and moisture ingress risks while supporting fast, reliable cover-state reporting within 100ms. |
| Industrial Proximity Switching | Home Appliance Lid Monitoring |
|
Use Scenario: Monitor door or tray position in vending machines, test equipment, or automated dispensers. IC Role / Device Role / Timing Role: Low-power magnetic presence sensor interfacing with PLC or microcontroller I/O, operating from 2.5V–3.3V rails. Use Value: Delivers 10-year operational life on primary batteries and resists EMI in electrically noisy factory environments. |
Use Scenario: Detect washing machine or microwave oven door closure for safety interlock and control activation. IC Role / Device Role / Timing Role: Fail-safe position monitor with hysteresis preventing bounce-induced false unlocks during vibration or thermal expansion. Use Value: Meets IEC 60335-1 requirements for appliance safety via robust magnetic threshold margin and 8kV ESD tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar omnipolar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL33020QRTT-7 | Higher sensitivity (±15G Bop), 2.7–5.5V supply, 8μA avg. current - lacks hibernation mode. | Requires regulated 3.3V rail; less suitable for coin-cell or single-Li-ion systems below 2.7V. | Select when tighter magnetic threshold control is needed and higher supply voltage is available. |
| TLE4913HTSA1 | Bipolar operation only (north-only), 3.0–24V supply, 3.5mA IDD - not micropower. | Designed for automotive 12V systems; incompatible with sub-2V battery operation. | Choose only for 12V industrial or automotive proximity sensing where power budget is unconstrained. |
Compared with AL33020QRTT-7 and TLE4913HTSA1, the AH1902-FA-7 uniquely combines 1.6V operation, 4.3μA average current, and true omnipolarity - making it the sole fit for compact, long-life, dual-pole magnetic sensing in portable consumer devices.
Availability
AH1902-FA-7 is available at Aetrix Electronics and suitable for flip phone detection, smart cover sensing, and industrial proximity switching requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for AH1902-FA-7 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 high-reliability, energy-efficient components for consumer, industrial, and computing markets.
The AH1902 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, contactless position sensing in space- and battery-constrained portable electronics.
FAQ
What is the minimum supply voltage for reliable operation of AH1902-FA-7?
The AH1902-FA-7 operates reliably down to 1.6V, with specified magnetic thresholds and timing parameters fully guaranteed across this range. Below 1.6V, output behavior is undefined and not characterized - use only within the 1.6V–3.6V recommended operating window.
Does AH1902-FA-7 require an external decoupling capacitor?
Yes - a 100nF ceramic capacitor must be placed as close as possible to the VDD pin to stabilize the internal regulator and suppress RF noise. Omitting it degrades magnetic sensitivity and increases susceptibility to false triggering from EMI.
Can the NC pin on the X1-DFN1216-4 package be used for thermal relief?
No - Pin 3 is internally unconnected and provides no electrical or thermal path. It may be left floating or tied to GND solely for mechanical anchoring; connecting it to any voltage rail risks latch-up or damage due to unintended coupling paths.
How does the hibernating clocking system affect response time?
The AH1902-FA-7 wakes every 50–100ms to sample the magnetic field, with 50–100μs active sampling time. Maximum latency from field change to output transition is therefore one full period - up to 100ms - which is acceptable for human-interface applications like lid detection but unsuitable for high-speed rotor counting.
AH1902-FA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4.8mT Trip, ±3.8mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply (Max):
- 8µA
- Current - Output (Max):
- 3mA
- Output Type:
- Push-Pull
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1216-4
AH1902-FA-7 FAQ
1.How can I place an order for AH1902-FA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1902-FA-7 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 AH1902-FA-7 reliable?
The price and inventory of AH1902-FA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1902-FA-7 is usually 5 days.
3.What payment methods are accepted for AH1902-FA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1902-FA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1902-FA-7?
AH1902-FA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1902-FA-7 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 AH1902-FA-7?
For technical support, including AH1902-FA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1902-FA-7 requirements.
6.How does Aetrix verify that AH1902-FA-7 is sourced from the original manufacturer or authorized distributors?
All AH1902-FA-7 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 AH1902-FA-7 meets industry standards.
7.What is the process for return or replacement of AH1902-FA-7?
All AH1902-FA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1902-FA-7, 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 AH1902-FA-7 part is unused and in its original packaging.
Return procedure for AH1902-FA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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