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Diodes Incorporated AH1903-FA-7
- Part No.:
- AH1903-FA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
AH1903-FA-7.pdf
- Description:
- MAG SWITCH OMNIPOLAR/UNIPLR 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,776
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Product details
Overview
AH1903-FA-7 from Diodes Incorporated is a high-sensitivity, micropower Hall-effect switch IC with user-selectable unipolar or omnipolar magnetic detection mode, 1.6V–3.6V supply range, 4.3µA average current at 1.8V, and X1-DFN1216-4 package; used in flip-cover detection for smartphones and ultrabooks.
For engineers reviewing the AH1903-FA-7 datasheet, AH1903-FA-7 pinout, AH1903-FA-7 application, or AH1903-FA-7 equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), SEL pin logic configuration, chopper-stabilized temperature stability, and ultra-low sleep-mode current for battery-constrained designs.
Technical Context
The AH1903 implements a chopper-stabilized Hall sensor architecture to suppress offset drift and enhance thermal stability across –40°C to +85°C. Its hibernating clocking system alternates between 100µs awake periods and ~100ms sleep intervals, achieving sub-5µA average supply current at 1.8V.
Operation mode is determined by the SEL pin: open/high enables unipolar detection (South pole only on marked side), while grounded SEL enables omnipolar detection (North or South pole). Output is open-drain, actively pulled low when B > Bop and released when B < Brp, with 10G typical hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 3.6V - supports single-cell Li-ion and coin-cell battery systems without regulation |
| Average Supply Current | 4.3µA @ 1.8V - enables multi-year operation in always-on cover-detect applications |
| Unipolar Bop (Typ) | 33 Gauss - detects weak magnets at ≥2.5mm air gap in smartphone flip mechanisms |
| Omnipolar Bop (Typ) | ±33 Gauss - enables bidirectional lid sensing without magnet polarity alignment |
| Output Type | Open-drain - eliminates need for external pull-up resistor; compatible with 1.8V/3.3V logic |
| Operating Temperature | –40°C to +85°C - qualified for consumer and industrial portable equipment environments |
| Hysteresis (Bhy) | 10 Gauss - prevents chatter near switching threshold under vibration or field fluctuation |
Pinout & Package
Package: X1-DFN1216-4 (1.2mm × 1.6mm × 0.5mm, 4-pin, exposed VDD pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTPUT) | Open-drain output | Active-low signal; sinks up to 3mA; requires no external pull-up |
| 2 (GND) | Ground reference | Return path for supply and output current; connects to PCB ground plane |
| 3 (SEL) | Mode select input | Logic-high (≥1.4V) = unipolar; logic-low (≤0.5V) = omnipolar; internal 50kΩ pull-up active during awake phase |
| 4 (VDD) | Power supply input | 1.6V–3.6V supply; center exposed pad internally tied to VDD - must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized sensing | Reduces temperature-induced offset drift to <0.1G/°C, enabling stable switching across full operating range |
| Configurable magnetic polarity response | Single SEL pin toggles between unipolar (directional) and omnipolar (bidirectional) detection without hardware change |
| Micropower hibernation cycle | 100µs awake time + 100ms sleep period yields 0.1% duty cycle, minimizing average current draw |
| Integrated pull-up on SEL | 50kΩ internal resistor allows unconnected SEL to default to unipolar mode - reduces BOM count and layout complexity |
| High ESD immunity | 8kV HBM on VDD/GND/OUTPUT pins - eliminates need for external TVS in handheld device designs |
Applications
| Smartphone Flip Cover Detection | Ultrabook Display Lid Switch |
|---|---|
Use Scenario: Detect open/close state of clamshell phone covers using embedded magnet and PCB-mounted sensor. IC Role / Device Role / Timing Role: Hall-effect switch providing digital enable/disable signal to suspend/resume baseband processor. Use Value: 4.3µA average current extends standby battery life beyond 12 months; 33G Bop ensures reliable actuation with low-cost ferrite magnets. | Use Scenario: Sense lid position in ultrabook chassis to trigger display power-on/off and OS sleep/wake transitions. IC Role / Device Role / Timing Role: Bidirectional position detector interfacing directly with EC (Embedded Controller) GPIO. Use Value: Omnipolar mode eliminates magnet orientation constraints during assembly; X1-DFN1216-4 footprint saves >60% board area vs. SOT-23. |
| Tablet Smart Dock Presence | Home Appliance Door Interlock |
Use Scenario: Confirm secure attachment of tablet to keyboard dock or charging cradle via magnetic alignment. IC Role / Device Role / Timing Role: Proximity switch signaling mechanical mating status to application processor. Use Value: SEL pin controlled by host MCU enables runtime reconfiguration between docked/undocked modes without firmware update. | Use Scenario: Safety interlock for microwave oven or washing machine door to disable power when opened. IC Role / Device Role / Timing Role: Fail-safe position monitor with hysteresis preventing false triggers from vibration or field noise. Use Value: 10G hysteresis and 8kV ESD rating ensure robust operation in electrically noisy, high-humidity environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3320EUST-7 | Fixed omnipolar mode only; no SEL pin; 5.5µA avg current at 1.8V | Lacks programmable polarity - requires fixed magnet orientation in design | Select when omnipolar-only function suffices and SEL control adds unnecessary complexity |
| TMAG5170AHQDBVR | 3-axis linear Hall sensor with SPI interface; 12-bit output; 150µA active current | Provides analog field strength data instead of digital switch output; requires MCU firmware support | Select when position angle or field magnitude measurement is required beyond simple on/off detection |
Compared with AL3320EUST-7 and TMAG5170AHQDBVR, the AH1903-FA-7 uniquely balances ultra-low power, pin-selectable polarity, and integrated output drive - making it optimal for cost-sensitive, battery-powered mechanical presence detection where simplicity and longevity are critical.
Availability
AH1903-FA-7 is available at Aetrix Electronics and suitable for smartphone cover detection, ultrabook lid sensing, and home appliance interlocks requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AH1903-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, computing, and industrial markets.
The AH1903 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, space-constrained mechanical sensing applications in portable electronics and smart appliances.
FAQ
What is the function of the exposed thermal pad on the AH1903-FA-7 package?
The center exposed pad is internally connected to VDD and must remain unconnected on the PCB. It is not a ground pad or thermal relief path. Connecting it to GND or other signals risks latch-up or functional failure. Layout guidelines require leaving the pad floating per Diodes AP02001.
How does the SEL pin behave when left unconnected?
When unconnected, the SEL pin is pulled high internally via a 50kΩ resistor during the awake phase, configuring the device for unipolar operation. No external pull-up is needed. This default behavior simplifies designs where only South-pole detection is required.
Can the AH1903-FA-7 operate reliably at 1.6V supply voltage?
Yes - the AH1903-FA-7 is fully specified down to 1.6V. At this voltage, Bop remains 21–48 Gauss and average current is 4.3–8µA. Performance is validated across –40°C to +85°C, making it suitable for single-cell alkaline or LiFePO₄ battery systems.
What is the timing requirement after changing the SEL pin state?
After changing SEL logic level, the output becomes valid only after two complete awake periods. Given a typical 100ms period, this takes ≥200ms. During this interval, the output may be indeterminate - firmware must delay reading until stabilization completes.
AH1903-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, Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4.8mT Trip, ±3.8mT Release; 4.8mT Trip, 0.9mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply (Max):
- 8µA
- Current - Output (Max):
- 3mA
- Output Type:
- Push-Pull
- Features:
- Programmable Function
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1216-4
AH1903-FA-7 FAQ
1.How can I place an order for AH1903-FA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1903-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 AH1903-FA-7 reliable?
The price and inventory of AH1903-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 AH1903-FA-7 is usually 5 days.
3.What payment methods are accepted for AH1903-FA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1903-FA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1903-FA-7?
AH1903-FA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1903-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 AH1903-FA-7?
For technical support, including AH1903-FA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1903-FA-7 requirements.
6.How does Aetrix verify that AH1903-FA-7 is sourced from the original manufacturer or authorized distributors?
All AH1903-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 AH1903-FA-7 meets industry standards.
7.What is the process for return or replacement of AH1903-FA-7?
All AH1903-FA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1903-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 AH1903-FA-7 part is unused and in its original packaging.
Return procedure for AH1903-FA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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