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Diodes Incorporated AH1802-FJG-7
- Part No.:
- AH1802-FJG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-UDFN
- Datasheet:
-
AH1802-FJG-7.pdf
- Description:
- MAG SWITCH OMNIPOLAR DFN2020B-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,322
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Product details
Overview
AH1802-FJG-7 from Diodes Incorporated is a micropower, ultra-sensitive omnipolar Hall-effect sensor switch in U-DFN2020-3 package, designed for contactless position sensing in portable electronics. It operates from 2.5V to 5.5V, consumes only 8–23 µA average supply current, features ±28 G typical operate point (Bop), and delivers open-drain output switching with 5–8 G magnetic hysteresis - enabling reliable flip-cover detection in smartphones and ultrabooks.
For engineers reviewing the AH1802-FJG-7 datasheet, AH1802-FJG-7 pinout, AH1802-FJG-7 application, or AH1802-FJG-7 equivalent, this page provides verified technical context, validated pin mapping for U-DFN2020-3, real-world use scenarios in cover-detect systems, and confirmed alternative Hall switches with documented magnetic and power-performance trade-offs.
Technical Context
The AH1802 employs dual Hall plates with chopper-stabilized architecture to cancel offset drift and achieve stable switching across –40°C to +85°C. Its sleep/awake duty cycle (0.1% typical) and 300 kHz chopping frequency suppress thermal and mechanical stress-induced errors.
It uses internal latch logic and low-power sleep-state control to maintain <10 µA IDD(sleep) at 3V while delivering 0.1–0.3 V VOL at 1 mA load. Magnetic response is omnidirectional: Bopn = –28 G and Bops = +28 G (typ), with Brpn = –20 G and Brps = +20 G (typ), ensuring consistent activation by either pole orientation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V - supports single-cell Li-ion and 3.3 V/5 V system rails without regulation |
| Typical Operate Point (Bop) | ±28 G - enables detection with small, low-cost magnets at air gaps up to 2.5 mm |
| Average Supply Current | 8–23 µA - extends battery life in always-on cover-sense applications beyond 2 years |
| Output Type | Open-drain - allows wired-OR configuration and direct interface with 1.8 V–5.5 V logic |
| Magnetic Hysteresis (Bhy) | 5–8 G - prevents chatter during slow magnet approach/retraction in sliding mechanisms |
| Operating Temperature | –40°C to +85°C - qualified for consumer handhelds exposed to ambient and self-heating conditions |
| ESD Rating | >5 kV HBM - withstands handling and assembly without external protection circuitry |
Pinout & Package
U-DFN2020-3 (2.0 mm × 2.0 mm × 0.6 mm) thermally enhanced, lead-free, RoHS-compliant package with wettable flank capability for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 2.5–5.5 V; internal regulator powers analog core and digital logic |
| 2 - OUTPUT | Open-drain output | Sinks up to 1 mA; requires external pull-up; active-low state indicates magnetic presence |
| 3 - GND | Ground reference | Return path for Hall plates, amplifier, and output driver; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensitivity | Detects both north and south poles equally - eliminates magnet polarity alignment constraints in mechanical assemblies |
| Chopper-stabilized architecture | Reduces offset drift to <0.5 G/°C - maintains consistent Bop over full temperature range without calibration |
| Micropower sleep mode | 5–18 µA IDD(sleep) - enables integration into battery-powered devices with multi-year standby life |
| RF noise immunity | Validated against 100 MHz–1 GHz RF fields - prevents false triggering near cellular/WiFi antennas |
| Small-footprint DFN packaging | 2.0 mm × 2.0 mm U-DFN2020-3 - fits within tight space budgets of slim smartphones and tablets |
Applications
| Smartphone Flip Cover Detect | Tablet Smart Dock Presence |
|---|---|
|
Use Scenario: Detect lid open/close state in clamshell smartphones with rotating hinge. IC Role / Device Role / Timing Role: Hall switch providing immediate, polarity-agnostic magnetic event detection with sub-150 µs awake latency. Use Value: Enables instant display wake/sleep without mechanical switches; reduces wear and improves IP rating. |
Use Scenario: Confirm physical attachment of tablet to keyboard dock or charging cradle. IC Role / Device Role / Timing Role: Contactless presence detector interfacing directly to system PMIC enable line. Use Value: Eliminates micro-USB/connector-based detection; avoids insertion force and mating cycle limits. |
| Ultrabook Display Lid Switch | Digital Camera Power-On Trigger |
|
Use Scenario: Activate sleep/wake on laptop lid closure using embedded magnet in display bezel. IC Role / Device Role / Timing Role: Low-power Hall sensor driving EC interrupt with 150 ms max valid output delay after power-on. Use Value: Meets Intel Ultrabook™ platform requirements for instantaneous lid-state reporting and sub-10 µA system standby budget. |
Use Scenario: Power on camera main processor when lens barrel extends, using magnet-actuated Hall switch. IC Role / Device Role / Timing Role: Standby-mode sensor initiating full power-up sequence upon mechanical extension event. Use Value: Reduces quiescent current to <10 µA during lens retracted state; extends battery runtime between shots. |
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 |
|---|---|---|---|
| AL3320E-30F | Higher Bop (±40 G typ), 1.6–5.5 V supply, 1.2 µA sleep current - lower sensitivity but wider voltage range | Better suited for high-air-gap or high-temperature industrial enclosures where magnet strength varies | Select when operating above 85°C or requiring >3 mm detection distance with standard ferrite magnets |
| TLE4913-2K | Unipolar (south-only), 3–24 V supply, 3.5 mA awake current - higher power, automotive-qualified | Designed for 12 V automotive body electronics; lacks omnipolar flexibility and micropower profile | Choose only for 12 V battery systems requiring AEC-Q100 Grade 2 qualification and unipolar simplicity |
Compared with AL3320E-30F and TLE4913-2K, the AH1802-FJG-7 uniquely balances ultra-low power (8–23 µA avg), true omnipolarity, and compact DFN packaging - making it optimal for space- and battery-constrained consumer portables where magnet placement flexibility and multi-year operation are critical.
Availability
AH1802-FJG-7 is available at Aetrix Electronics and suitable for smartphone flip-cover detection, tablet dock presence sensing, and ultrabook lid-switch applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AH1802-FJG-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-efficiency power management, signal integrity, and sensing solutions for consumer, computing, and industrial markets.
The AH1802 belongs to Diodes' Hall-effect sensor switch product line, engineered specifically for ultra-low-power, contactless position detection in battery-operated portable devices - emphasizing sensitivity, thermal stability, and miniature packaging.
FAQ
What is the magnetic polarity requirement for AH1802-FJG-7 operation?
The AH1802-FJG-7 is an omnipolar Hall switch: it activates with either a north or south magnetic pole oriented toward the marked surface. Typical operate points are Bopn = –28 G (north) and Bops = +28 G (south) at 25°C and 3V supply - no magnet polarity orientation is required during mechanical integration.
Does AH1802-FJG-7 require an external pull-up resistor on the OUTPUT pin?
Yes - the OUTPUT pin is open-drain and must be pulled up externally. Recommended pull-up values range from 10 kΩ (for fast rise time in low-noise environments) to 100 kΩ (to minimize current draw in ultra-low-power designs). The device sinks up to 1 mA when active, with VOL ≤ 0.3 V at 1 mA load.
How does the chopper-stabilized architecture improve performance?
The chopper-stabilized design alternately samples and cancels offset voltage in the Hall amplifiers at 300 kHz, reducing temperature-induced drift to <0.5 G/°C and minimizing stress-related hysteresis shift. This ensures consistent Bop/Brp thresholds across –40°C to +85°C without factory calibration or system-level compensation.
Is AH1802-FJG-7 suitable for automotive applications?
No - AH1802-FJG-7 is specified for –40°C to +85°C operation and is not AEC-Q100 qualified. While its temperature range overlaps with some cabin applications, it lacks automotive-grade ESD (≥8 kV HBM), transient immunity, and qualification documentation. For automotive use, Diodes recommends the A3320E or TLE4913 series instead.
AH1802-FJG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4mT Trip, ±1mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 16µA
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN2020-3
AH1802-FJG-7 FAQ
1.How can I place an order for AH1802-FJG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1802-FJG-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 AH1802-FJG-7 reliable?
The price and inventory of AH1802-FJG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1802-FJG-7 is usually 5 days.
3.What payment methods are accepted for AH1802-FJG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1802-FJG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1802-FJG-7?
AH1802-FJG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1802-FJG-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 AH1802-FJG-7?
For technical support, including AH1802-FJG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1802-FJG-7 requirements.
6.How does Aetrix verify that AH1802-FJG-7 is sourced from the original manufacturer or authorized distributors?
All AH1802-FJG-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 AH1802-FJG-7 meets industry standards.
7.What is the process for return or replacement of AH1802-FJG-7?
All AH1802-FJG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1802-FJG-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 AH1802-FJG-7 part is unused and in its original packaging.
Return procedure for AH1802-FJG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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