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Diodes Incorporated AH1801-WG-7
- Part No.:
- AH1801-WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1801-WG-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
AH1801-WG-7 from Diodes Incorporated is a micropower, ultra-sensitive Hall effect switch with inverted output logic, designed for battery-operated handheld devices. It operates from 2.5V to 5.5V, consumes only 8–27 µA average supply current at 3V, features ±40–60 Gauss operate point (Bop), and uses SC59 (SOT23) packaging. Its chopper-stabilized architecture ensures stable switching in cellular phone flip detection circuits.
For engineers reviewing the AH1801-WG-7 datasheet, AH1801-WG-7 pinout, AH1801-WG-7 application, or AH1801-WG-7 equivalent, key selection criteria include magnetic sensitivity (Bop/Brp), ultra-low power consumption (<30 µA avg), inverted output behavior, SC59 package compatibility, and operating temperature range (−40°C to +85°C).
Technical Context
The AH1801-WG-7 integrates dual Hall plates with offset cancellation and a chopper-stabilized amplifier to suppress thermal drift and mechanical stress effects. Its internal latch holds output state until magnetic field drops below release point (Brp), enabling clean hysteresis-based switching without external components.
It delivers inverted logic: output is high (ON) with no magnetic field and turns low (OFF) when B > Bop (e.g., ≥40 Gauss south pole). Wake-up time is 75–150 µs, and sampling period is 75–150 ms - optimized for intermittent sensing in portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - supports single-cell Li-ion or alkaline battery operation without regulation. |
| Average Supply Current | 8–27 µA at VDD = 2.5–5.5V - enables multi-year battery life in low-duty-cycle detection. |
| Operate Point (Bop) | ±40–60 Gauss - detects weak magnetic fields from small magnets in clamshell or slider mechanisms. |
| Hysteresis (Bhy) | ≥10 Gauss - prevents chatter during slow magnetic transitions near threshold. |
| Output Logic | Inverted - high-Z output pulled up externally; active-low signal simplifies interface with microcontroller GPIO. |
| Operating Temperature | −40°C to +85°C - qualified for consumer handheld environments including outdoor use. |
| ESD Rating (HBM) | >6 kV (SC59) - robust against handling and assembly ESD events in manufacturing. |
Pinout & Package
Package: SC59 (commonly known as SOT23 in Asia), 3-pin surface-mount, low-profile (1.3 mm max height), RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VDD | Power Supply Input | Accepts 2.5–5.5V; internal regulator supplies bias to Hall plates and logic. |
| 2. GND | Ground Reference | Return path for supply and output stage; must be low-impedance for noise immunity. |
| 3. Output | Open-Drain Output | Active-low, requires external pull-up (10–100 kΩ); sinks ≤1 mA at 0.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 24 µW typical at 3V - reduces quiescent load on coin-cell or single-Li-ion batteries. |
| Chopper Stabilization | Eliminates offset drift over temperature and time - maintains consistent Bop/Brp across −40°C to +85°C. |
| Pole-Agnostic Sensing | Responds to either north or south pole - simplifies magnet orientation in mechanical assemblies. |
| RF Noise Immunity | Validated against common-band interference - reliable operation near GSM/Bluetooth antennas in phones. |
| Stress Insensitivity | Unaffected by PCB bending or encapsulation pressure - stable performance in thin, flexible handheld housings. |
Applications
| Clamshell Phone Detection | Wireless Headset Lid Sensing |
|---|---|
Use Scenario: Detects open/closed state of flip-style mobile phone covers using embedded magnet and PCB-mounted sensor. IC Role / Device Role / Timing Role: Hall switch providing latched ON/OFF signal to baseband processor GPIO, eliminating need for polling. Use Value: Enables instant sleep/wake transition with <27 µA average current draw - extends standby time by months. | Use Scenario: Monitors charging case lid position in true wireless stereo (TWS) earbud systems. IC Role / Device Role / Timing Role: Inverted-output switch triggers MCU wake-up only when lid opens, reducing false triggers from vibration. Use Value: Hysteresis (≥10 G) prevents bounce during lid flex; SC59 footprint fits tight space constraints. |
| Remote Control Power Management | Smartpen Cap Detection |
Use Scenario: Detects removal of battery compartment cover in IR remote controls to enable low-power mode. IC Role / Device Role / Timing Role: Standby-state high output pulls MCU interrupt line; magnet presence forces low to disable peripherals. Use Value: 2.5V minimum supply allows direct connection to alkaline cells; no LDO needed. | Use Scenario: Identifies cap-on/cap-off state in digital stylus pens to activate/deactivate Bluetooth pairing. IC Role / Device Role / Timing Role: Ultra-sensitive Bop (40 G typ.) works with tiny neodymium magnets embedded in plastic caps. Use Value: SC59 package (2.9 × 1.3 × 1.3 mm) fits inside pen barrel diameter <10 mm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3212LLHLT-T | Higher supply current (12 µA typ.), wider Bop range (±25–75 G), same SC59 package. | Less sensitive at low field; better for industrial proximity where field strength varies widely. | Select if higher hysteresis margin or extended temperature range (+150°C) is required. |
| MELEXIS US1881EUA-ABA-000-REEL | Lower Bop (±15–35 G), 5 µA avg current, DFN2020-3 package only - no SC59 option. | More sensitive but less robust to mechanical stress; requires re-layout for smaller footprint. | Choose only if board space is constrained and ultra-low field detection is mandatory. |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, AH1801-WG-7 uniquely balances ultra-low power (8–27 µA), SC59 compatibility, and 40–60 G operate point - making it optimal for cost-sensitive, space-constrained consumer handhelds where battery life and layout continuity are critical.
Availability
AH1801-WG-7 is available at Aetrix Electronics and suitable for cellular phone clamshell detection, wireless headset lid sensing, and remote control power management requiring stable component supply and long-term manufacturability.
Supply support for AH1801-WG-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 and manufacturing operations across Asia and the Americas.
The AH1801 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic sensing in battery-powered consumer electronics - emphasizing sensitivity, stability, and package flexibility.
FAQ
What is the magnetic polarity response of AH1801-WG-7?
The AH1801-WG-7 responds to both north and south magnetic poles - output turns OFF when either pole exceeds the operate point (Bop ≈ ±40–60 G). This eliminates magnet orientation constraints during mechanical integration, supporting simplified assembly in handheld enclosures.
Does AH1801-WG-7 require an external pull-up resistor?
Yes - its open-drain output requires an external pull-up resistor (10–100 kΩ recommended) to VDD. Without it, the output remains floating when inactive. The device sinks ≤1 mA when active, ensuring compatibility with standard microcontroller input thresholds.
Is AH1801-WG-7 suitable for automotive applications?
No - AH1801-WG-7 is specified for −40°C to +85°C operation and lacks AEC-Q200 qualification. It is intended for consumer portable electronics. For automotive use, Diodes offers the AH336xQ series, qualified to AEC-Q100 Grade 2 (−40°C to +105°C).
Why does AH1801-WG-7 have inverted output logic?
The inverted logic (output HIGH with no field, LOW when magnet present) enables direct wake-up of microcontrollers via interrupt pins without level-shifting. This reduces BOM count and simplifies firmware - especially valuable in battery-critical designs where minimizing active time is essential.
AH1801-WG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SC-59-3
AH1801-WG-7 FAQ
1.How can I place an order for AH1801-WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1801-WG-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-WG-7 reliable?
The price and inventory of AH1801-WG-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-WG-7 is usually 5 days.
3.What payment methods are accepted for AH1801-WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1801-WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1801-WG-7?
AH1801-WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1801-WG-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-WG-7?
For technical support, including AH1801-WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1801-WG-7 requirements.
6.How does Aetrix verify that AH1801-WG-7 is sourced from the original manufacturer or authorized distributors?
All AH1801-WG-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-WG-7 meets industry standards.
7.What is the process for return or replacement of AH1801-WG-7?
All AH1801-WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1801-WG-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-WG-7 part is unused and in its original packaging.
Return procedure for AH1801-WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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