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Diodes Incorporated AH1801-FJG-7
- Part No.:
- AH1801-FJG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-UDFN
- Datasheet:
-
AH1801-FJG-7.pdf
- Description:
- MAG SWITCH OMNIPOLAR DFN2020B-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
AH1801-FJG-7 from Diodes Incorporated is a micropower, ultra-sensitive Hall effect switch with inverted output logic (ON with no magnetic field), operating from 2.5V to 5.5V, consuming only 8–27 µA average supply current at 3V, and featuring ±40–60 Gauss operate points for both north and south poles - designed for battery-powered mobile devices including cellular phones and PDAs.
For engineers reviewing the AH1801-FJG-7 datasheet, AH1801-FJG-7 pinout, AH1801-FJG-7 application, or AH1801-FJG-7 equivalent, key selection considerations include its chopper-stabilized architecture, -40°C to +85°C operating range, DFN2020-3 package footprint, ultra-low 24 µW power consumption at 3V, and magnetic hysteresis of ≥10 Gauss for noise-immune switching in handheld equipment.
Technical Context
The AH1801-FJG-7 integrates dual Hall plates with offset cancellation and a chopper-stabilized amplifier to suppress thermal drift and mechanical stress effects, enabling stable operation across temperature and physical vibration. Its logical latch ensures clean output state retention until magnetic flux drops below the release point (Brp).
It operates in a low-duty-cycle sampling mode: awake time is 75–150 µs, period is 75–150 ms, and DC duty cycle is 0.1%, minimizing average current draw. Output is open-drain with <0.3 V on-voltage at 1 mA and <1 µA leakage when off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V - supports single-cell Li-ion and alkaline battery systems without regulation |
| Average Supply Current | 8–27 µA at VDD = 2.5–5.5 V - enables multi-year battery life in always-on sensing nodes |
| Operate Point (Bop) | ±40–60 Gauss - detects weak magnetic fields from small magnets in flip covers or sliders |
| Hysteresis (Bhy) | ≥10 Gauss - prevents chatter during slow magnetic transitions near threshold |
| Output Type | Open-drain, inverted logic - pulls low when magnet present, high-Z when absent; requires external pull-up |
| Operating Temperature | -40°C to +85°C - qualified for consumer portable electronics ambient environments |
| ESD Rating (HBM) | >5 kV - robust against handling discharge in assembly and end-user environments |
Pinout & Package
Package: DFN2020-3 (2.0 mm × 2.0 mm × 0.6 mm, 3-pin, exposed thermal pad not electrically connected). Pin 1 = VDD, Pin 2 = GND, Pin 3 = Output (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Power supply input | Accepts 2.5–5.5 V; internal regulator supplies bias to Hall plates and logic |
| 2 (GND) | Ground reference | Common return for supply and output stage; must be low-impedance for stable switching |
| 3 (Output) | Open-drain digital output | Inverted logic: high-impedance when no magnet, pulled low when B > Bop; requires external pull-up resistor (10–100 kΩ) |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Eliminates offset drift over temperature and time, ensuring consistent Bop/Brp across -40°C to +85°C |
| Ultra-low power sampling | 75–150 µs awake time per 75–150 ms period reduces average current to ≤27 µA |
| North/south pole sensitivity | Dual Hall plate architecture enables activation by either pole - simplifies mechanical magnet placement |
| RF noise immunity | Integrated filtering and chopper design rejects common-mode EMI in cellular-band environments |
| Stress-insensitive layout | Die mounting and Hall plate orientation minimize output shift due to PCB flex or thermal expansion |
Applications
| Flip Cover Detection | Slider Position Sensing |
|---|---|
Use Scenario: Detecting open/closed state of clamshell phone or tablet cover using a small embedded magnet. IC Role / Device Role / Timing Role: Hall switch providing inverted logic output to MCU GPIO, signaling cover closure via magnetic field presence. Use Value: 24 µW typical power enables continuous monitoring without measurable impact on battery runtime. | Use Scenario: Identifying extended/retracted position of sliding keypad or camera module in compact handsets. IC Role / Device Role / Timing Role: Magnetic position detector interfacing directly to baseband processor interrupt line. Use Value: ±40–60 Gauss operate point allows use of miniature 2 mm × 1 mm neodymium magnets placed within tight mechanical tolerances. |
| Wireless Headset Lid Switch | PDA Stylus Dock Presence |
Use Scenario: Activating sleep/wake function when wireless headset charging case lid is closed. IC Role / Device Role / Timing Role: Low-power Hall sensor driving wake signal to Bluetooth SoC upon magnetic closure. Use Value: 0.1% duty cycle and sub-30 µA average current meet strict energy budgets for BLE accessories. | Use Scenario: Confirming stylus insertion into PDA cradle before initiating charging or sync sequence. IC Role / Device Role / Timing Role: Digital proximity indicator feeding status to application controller via I²C-compatible GPIO. Use Value: ≥10 Gauss hysteresis prevents false triggers during stylus insertion/removal vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3320EUSTT1 | Higher Bop (±60–90 Gauss), 3.3 µA avg. IDD, SC70-3 package | Requires stronger magnet; better suited for industrial encoders than consumer flip covers | Select if higher magnetic immunity needed and space allows SC70 footprint |
| DRV5013AJQDBVR | Bipolar latching output, 2.7–38 V supply, 3.6 mA IDD, SOT-23 | Not micropower; intended for automotive body control, not battery-constrained devices | Choose only for non-battery applications requiring latch behavior and wide voltage range |
Compared with AL3320EUSTT1 and DRV5013AJQDBVR, the AH1801-FJG-7 uniquely balances ultra-low power (≤27 µA), DFN2020-3 miniaturization, and bipolar sensitivity - making it optimal for space- and energy-constrained consumer portables where magnet strength is limited.
Availability
AH1801-FJG-7 is available at Aetrix Electronics and suitable for flip cover detection, slider position sensing, wireless headset lid switches, and PDA stylus dock presence applications requiring stable component supply and long-term manufacturability support.
Supply support for AH1801-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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.
The AH1801 belongs to Diodes' micropower Hall-effect switch product line, engineered specifically for battery-operated portable electronics where minimal current draw, small footprint, and reliable magnetic actuation are critical.
FAQ
What is the magnetic polarity response of the AH1801-FJG-7?
The AH1801-FJG-7 responds to both north and south magnetic poles with identical operate (Bop) and release (Brp) thresholds - ±40–60 Gauss for Bop and ±10–30 Gauss for Brp - due to its dual-Hall-plate architecture. This eliminates magnet orientation constraints during mechanical integration.
Does the AH1801-FJG-7 require an external capacitor?
Yes - a 10 nF to 100 nF ceramic decoupling capacitor between VDD and GND is recommended per the datasheet to stabilize the internal supply and improve RF noise immunity. Placement within 2 mm of the VDD/GND pins is critical for optimal performance.
Is the AH1801-FJG-7 pin-compatible with other Diodes Hall switches?
No - the AH1801-FJG-7 uses a 3-pin DFN2020-3 package with VDD-GND-OUT pinout, while alternatives like AH1808 (SC59) or AH336Q (SOT-23) have different pin assignments and footprints. PCB layout must be specific to DFN2020-3 mechanical dimensions and thermal pad requirements.
Why is AH1801-FJG-7 marked "NRND" in the ordering table?
"NRND" (Not Recommended for New Design) indicates Diodes Incorporated no longer promotes this part for new projects due to newer-generation alternatives (e.g., AH181x series), though it remains fully manufactured, stocked, and supported for legacy designs and existing production ramps through Aetrix Electronics.
AH1801-FJG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT 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
AH1801-FJG-7 FAQ
1.How can I place an order for AH1801-FJG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1801-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 AH1801-FJG-7 reliable?
The price and inventory of AH1801-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 AH1801-FJG-7 is usually 5 days.
3.What payment methods are accepted for AH1801-FJG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1801-FJG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1801-FJG-7?
AH1801-FJG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1801-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 AH1801-FJG-7?
For technical support, including AH1801-FJG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1801-FJG-7 requirements.
6.How does Aetrix verify that AH1801-FJG-7 is sourced from the original manufacturer or authorized distributors?
All AH1801-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 AH1801-FJG-7 meets industry standards.
7.What is the process for return or replacement of AH1801-FJG-7?
All AH1801-FJG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1801-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 AH1801-FJG-7 part is unused and in its original packaging.
Return procedure for AH1801-FJG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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