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Diodes Incorporated AH1812-FA-7
- Part No.:
- AH1812-FA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
AH1812-FA-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
AH1812-FA-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC with open-drain output, designed for magnetic proximity detection in ultra-low-power portable systems. It operates from 1.6V to 3.6V, draws only 4.3µA average supply current at 1.85V, and activates on either North or South magnetic pole with Bop of ±16–40 Gauss. Used in cover-open detection for smartphones and tablet holsters.
For engineers reviewing the AH1812-FA-7 datasheet, AH1812-FA-7 pinout, AH1812-FA-7 application, or AH1812-FA-7 equivalent, key selection criteria include micropower sleep current (2.5µA), hysteresis (≥10 Gauss), operating temperature range (−40°C to +85°C), and X1-DFN1216-4 package compatibility with space-constrained PCB layouts.
Technical Context
The AH1812 employs chopper-stabilized architecture to cancel offset drift and ensure stable switching thresholds across temperature. Its hibernating clocking system alternates between ultra-low-power sleep mode (2.5µA) and brief awake periods (100µs pulse width, 100ms period) for magnetic sampling.
It features an internal Hall plate, amplifier, latch, and open-drain driver - all integrated in a single die. The NC pin (Pin 3) is unconnected internally and may be left floating or tied to GND without functional impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6V to 3.6V - supports single-cell Li-ion and coin-cell battery operation without regulation. |
| Avg. Supply Current | 4.3µA at 1.85V - enables multi-year battery life in always-on detection applications. |
| Omnipolar Bop | ±16–40 Gauss - detects either magnetic pole orientation, simplifying mechanical design of magnetic actuators. |
| Hysteresis (Bhy) | ≥10 Gauss - prevents chatter during slow magnetic transitions near threshold. |
| Output Type | Open-drain - allows flexible pull-up voltage selection (up to 5.5V) and wired-OR interfacing. |
| Operating Temp | −40°C to +85°C - qualified for consumer and industrial portable equipment environments. |
| Package | X1-DFN1216-4 - 1.2mm × 1.6mm × 0.5mm low-profile footprint saves >60% board area vs. SOT-23. |
Pinout & Package
Package: X1-DFN1216-4 - 4-terminal, no-lead, wettable flank package with exposed thermal pad (not electrically connected). Dimensions: 1.20mm × 1.60mm × 0.50mm height. Pin 1 marked by chamfered corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Accepts 1.6–3.6V; must be decoupled with 10–100nF capacitor for noise immunity. |
| GND (Pin 2) | Ground reference | Primary return path for supply and output current; connects to thermal pad for improved dissipation. |
| NC (Pin 3) | No internal connection | May be left unconnected or tied to GND; no electrical function or performance impact. |
| OUTPUT (Pin 4) | Open-drain output | Sinks up to 2mA; requires external pull-up resistor (10–100kΩ) to define logic-high level. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces offset drift to <0.1mV/°C, enabling stable Bop/Brp over −40°C to +85°C. |
| Hibernating clocking | Reduces average current to 4.3µA while maintaining 100ms response latency for wake-on-field events. |
| Omnipolar magnetic sensing | Eliminates need for polarity-specific magnet placement - reduces assembly cost and field validation effort. |
| RF noise immunity | Validated against IEC 61000-4-3 (10V/m, 80–1000MHz), ensuring reliable operation in noisy mobile environments. |
| Green packaging | Halogen- and antimony-free, fully RoHS-compliant (≤900ppm Br+Cl, ≤1000ppm Sb), suitable for eco-sensitive markets. |
Applications
| Smartphone Cover Detection | Tablet Holster Sensing |
|---|---|
Use Scenario: Detects flip-cover open/close state in Android/iOS smartphones using embedded magnet and Hall sensor. IC Role / Device Role / Timing Role: Omnipolar switch providing edge-triggered logic-low signal upon magnetic field crossing Bop threshold. Use Value: Enables automatic screen on/off with <4.3µA quiescent draw - extends standby battery life by >30% vs. non-hibernating alternatives. |
Use Scenario: Identifies when a tablet PC is inserted into or removed from a magnetic holster accessory. IC Role / Device Role / Timing Role: Magnetic presence detector with hysteresis to prevent false triggers during partial insertion/removal. Use Value: Delivers robust detection across −40°C to +85°C ambient with no calibration required due to chopper-stabilized architecture. |
| Digital Camera Lens Cap Switch | Portable PC Display Lid Sensor |
Use Scenario: Activates power management when lens cap is mounted/dismounted on DSLR or mirrorless cameras. IC Role / Device Role / Timing Role: Low-leakage (0.1µA max) omnipolar switch enabling instant wake from deep sleep. Use Value: Supports sub-100ms wake latency and eliminates need for mechanical microswitches - improves reliability and IP rating. |
Use Scenario: Signals lid-open event to suspend/resume OS in ultrabooks and 2-in-1 laptops. IC Role / Device Role / Timing Role: System-level proximity monitor interfaced directly to EC or PMIC via open-drain output. Use Value: Integrates into 1.2mm × 1.6mm footprint - fits beneath narrow display bezels where SOT-23 is mechanically infeasible. |
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-10X30F | Higher Bop (±50G), 5.5V max VDD, 6µA avg current - less sensitive but wider supply range. | Better suited for industrial sensors with stronger magnets; not optimized for coin-cell battery life. | Select if system uses >3.6V rails or requires higher magnetic immunity in EMI-heavy environments. |
| TLE4913-2D | Automotive-qualified (AEC-Q100), 3.3–24V operation, 12µA avg current - higher power, broader temp range (−40°C to +150°C). | Designed for under-hood automotive use; over-specified for portable consumer devices. | Choose only for automotive-grade designs requiring PPAP support and extended temperature compliance. |
Compared with AL3320E-10X30F and TLE4913-2D, the AH1812-FA-7 uniquely balances ultra-low power (4.3µA), compact DFN packaging, and consumer-grade temperature range - making it optimal for battery-powered portable electronics where size and energy efficiency are primary constraints.
Availability
AH1812-FA-7 is available at Aetrix Electronics and suitable for smartphone cover detection, tablet holster sensing, and portable PC lid monitoring requiring stable component supply and long-term lifecycle support despite its obsolete status.
Supply support for AH1812-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AH1812 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power magnetic position and proximity detection in portable consumer electronics.
FAQ
Is AH1812-FA-7 still in active production?
No - Diodes Incorporated has discontinued the AH1812-FA-7 and marked it as obsolete per DS36171 Rev. 4 (June 2022). However, Aetrix Electronics maintains legacy inventory and offers controlled distribution with full traceability, including original Diodes date-code marking (e.g., "H2" = 2022, week 2).
Can AH1812-FA-7 operate from a 1.5V alkaline cell?
No - the absolute minimum supply voltage is 1.6V per datasheet specifications. At 1.5V, the device will not reliably sample or latch magnetic fields; output behavior becomes undefined. Use only within 1.6–3.6V range, such as with regulated 1.8V or 3.3V rails or fresh Li-ion cells (3.0–3.6V).
What is the purpose of the NC pin (Pin 3)?
Pin 3 is a true no-connect terminal - it has no internal bond wire or silicon connection. It may be left floating or tied to GND per layout convenience; neither choice affects functionality, power consumption, or magnetic sensitivity. Do not route signals or decoupling capacitors to this pin.
Does AH1812-FA-7 require an external pull-up resistor?
Yes - the open-drain OUTPUT pin (Pin 4) must be pulled up externally. Diodes recommends 10kΩ to 100kΩ to VDD or another compatible logic rail. Without a pull-up, the output remains indeterminate (high-impedance) when inactive, preventing proper logic-level interpretation by downstream circuitry.
AH1812-FA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4mT Trip, ±3.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply (Max):
- 2.3mA (Typ)
- Current - Output (Max):
- 2mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1216-4
AH1812-FA-7 FAQ
1.How can I place an order for AH1812-FA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1812-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 AH1812-FA-7 reliable?
The price and inventory of AH1812-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 AH1812-FA-7 is usually 5 days.
3.What payment methods are accepted for AH1812-FA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1812-FA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1812-FA-7?
AH1812-FA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1812-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 AH1812-FA-7?
For technical support, including AH1812-FA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1812-FA-7 requirements.
6.How does Aetrix verify that AH1812-FA-7 is sourced from the original manufacturer or authorized distributors?
All AH1812-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 AH1812-FA-7 meets industry standards.
7.What is the process for return or replacement of AH1812-FA-7?
All AH1812-FA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1812-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 AH1812-FA-7 part is unused and in its original packaging.
Return procedure for AH1812-FA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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