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Diodes Incorporated AH1809-W-7
- Part No.:
- AH1809-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1809-W-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:23,384
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Product details
Overview
AH1809-W-7 from Diodes Incorporated is a low-sensitivity, micropower omnipolar Hall-effect switch IC in SC59 package. It operates from 2.5V to 5.5V, consumes only 8–16 µA average supply current at 3V, and switches its open-drain output on with either North or South magnetic pole. Its BOP of ±100–165 Gauss and BRP of ±90–150 Gauss enable reliable position sensing in battery-powered smart e-meters and tamper-detection systems.
For engineers reviewing the AH1809-W-7 datasheet, AH1809-W-7 pinout, AH1809-W-7 application, or AH1809-W-7 equivalent, key selection factors include its chopper-stabilized architecture for thermal stability, -40°C to +125°C operating range, 24 µW power consumption at 3V, and SC59 footprint compatibility with legacy Hall switch layouts.
Technical Context
The AH1809 employs dual Hall plates and chopper stabilization to suppress offset drift and achieve ±15 Gauss typical hysteresis (Bhy) across temperature. Its internal oscillator enables ultra-low-power sleep mode with 75–125 ms period and 0.1% duty cycle, reducing average current to single-digit µA.
It delivers robust magnetic switching with guaranteed operate/release points over full voltage (2.5–5.5V) and temperature (-40°C to +125°C) ranges. The open-drain output supports up to 2.5 mA sink current and interfaces directly with 3.3V/5V logic via external pull-up resistor (10kΩ–100kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - Enables direct use with Li-ion, alkaline, and regulated 3.3V/5V rails without LDO. |
| Average Supply Current | 8–16 µA @ 3V, 25°C - Supports >10-year battery life in coin-cell-powered metering applications. |
| Operate Point (BOP) | ±100–165 Gauss - Low sensitivity prevents false triggering from stray fields; requires deliberate magnet proximity. |
| Hysteresis (BHY) | 10–20 Gauss - Ensures clean, bounce-free switching in vibrating industrial environments. |
| Operating Temperature | -40°C to +125°C - Qualified for outdoor smart meter enclosures and industrial control panels. |
| ESD Rating | 6 kV HBM - Withstands handling and board-level ESD events without protection diodes. |
| Output Type | Open-drain - Allows wired-OR configuration and flexible logic-level translation via external pull-up. |
Pinout & Package
Package: SC59 (SOT-23 variant), 3-pin, surface-mount, lead-free, RoHS-compliant. Dimensions: 2.80 × 1.60 × 1.10 mm (L × W × H). Thermal resistance θJA = ~217°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 2.5–5.5V; internal UVLO ensures reset below 2.3V; decoupling capacitor (10–100 nF) required at pin. |
| 2 - GND | Ground reference | Low-impedance return path for Hall sensor core and output driver; must be connected before VDD during power-up. |
| 3 - OUTPUT | Open-drain output | Sinks up to 2.5 mA when active; requires external pull-up (10–100 kΩ); logic-low valid after second sampling cycle (~150 ms). |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic activation | Responds identically to North or South pole - eliminates magnet orientation dependency in mechanical assemblies. |
| Chopper-stabilized architecture | Reduces temperature-induced offset drift to <±0.5 Gauss/°C - maintains consistent BOP/BRP across -40°C to +125°C. |
| Micropower sleep mode | 24 µW typical power at 3V - achieves sub-10 µA average current with 0.1% duty cycle, extending battery life. |
| High RF noise immunity | Validated against EN 61000-4-3 (10 V/m, 80 MHz–1 GHz) - operates reliably near switching power supplies and wireless modules. |
| Small SC59 footprint | Compatible with SOT-23 PCB land patterns - enables drop-in replacement for legacy Hall switches without layout redesign. |
Applications
| Smart E-Meter Tamper Detection | Industrial Door Position Sensing |
|---|---|
|
Use Scenario: Detect unauthorized meter cover removal using embedded magnet and reed-switch-replacement Hall sensor. IC Role / Device Role / Timing Role: Omnipolar switch providing fail-safe, polarity-agnostic closure signal to microcontroller GPIO. Use Value: Eliminates mechanical wear and contact bounce; operates reliably after 10+ years in sealed outdoor enclosures. |
Use Scenario: Monitor access door status in factory automation cabinets with metal housing and EMI-rich environment. IC Role / Device Role / Timing Role: Magnetic position detector interfacing to PLC input with open-drain output and 2.5 mA sink capability. Use Value: Immune to conducted noise from nearby VFDs; withstands repeated thermal cycling from ambient -25°C to +70°C. |
| Home Appliance Lid Switch | Proximity-Based Level Detection |
|
Use Scenario: Confirm washing machine lid closure before spin cycle initiation using magnet on hinge and PCB-mounted sensor. IC Role / Device Role / Timing Role: Low-power Hall switch enabling always-on monitoring with <10 µA average current draw. Use Value: Extends battery backup runtime during power outages; meets IEC 60335 safety isolation requirements. |
Use Scenario: Detect liquid level in non-metallic tank via float magnet passing sensor array mounted externally on tank wall. IC Role / Device Role / Timing Role: Threshold-based magnetic field detector with 15 Gauss hysteresis preventing oscillation near trip point. Use Value: No tank penetration required; immune to condensation, corrosion, and chemical exposure inside sealed enclosures. |
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 |
|---|---|---|---|
| ALLEGRO A3212LLHLT-T | Higher sensitivity (BOP ±30 Gauss); 5V-only supply; 1.6 mA quiescent current. | Better for weak-field detection but unsuitable for battery life >2 years; no 2.5V operation. | Select if magnet gap exceeds 5 mm and system uses regulated 5V rail. |
| MELEXIS US5881LUA-AAA-000-SP | Lower power (3.5 µA avg), but SC-70 package; BOP ±150 Gauss; no SIP-3L option. | Superior battery life but incompatible with SC59 footprint; limited high-temp validation beyond 105°C. | Select for space-constrained designs where SC59 replacement isn't required and temp range ≤105°C. |
Compared with A3212LLHLT-T and US5881LUA-AAA-000-SP, AH1809-W-7 uniquely balances low sensitivity, SC59 compatibility, and full -40°C to +125°C qualification-making it optimal for cost-sensitive, long-life industrial metering where magnet placement is controlled and board real estate is constrained.
Availability
AH1809-W-7 is available at Aetrix Electronics and suitable for smart e-meter design, industrial tamper-protection systems, and home appliance lid-sensing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AH1809-W-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 centers across Asia and manufacturing in China, Taiwan, and Malaysia.
AH1809 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, high-reliability position and proximity detection in battery-operated and harsh-environment industrial systems.
FAQ
What is the minimum recommended pull-up resistor value for the AH1809-W-7 open-drain output?
The datasheet specifies a recommended pull-up range of 10 kΩ to 100 kΩ. At 10 kΩ, the output achieves <0.3 V VOL with 1 mA sink, ensuring solid logic-low levels for 3.3V CMOS inputs. Lower values increase power consumption unnecessarily; higher values risk slow rise time in noisy environments.
Does the AH1809-W-7 require an external bypass capacitor?
Yes - a 10 nF to 100 nF ceramic capacitor between VDD and GND is mandatory per the datasheet. It stabilizes the internal regulator, suppresses supply ripple from shared PCB rails, and enhances immunity to RF noise, especially critical in smart meter applications near switching regulators.
Can the AH1809-W-7 operate reliably at 2.5V supply voltage across its full temperature range?
Yes - the datasheet guarantees operation from 2.5V to 5.5V at -40°C to +125°C. At 2.5V and -40°C, maximum supply current remains ≤12 µA in awake mode and ≤28 µA in sleep mode, with BOP/BRP shifts fully characterized and bounded per magnetic specs table.
Is the SC59 package of AH1809-W-7 compatible with standard SOT-23 pick-and-place equipment?
Yes - SC59 is mechanically identical to JEDEC TO-236AB (SOT-23), with 0.95 mm pitch and 1.60 mm body width. Standard SOT-23 nozzles and stencil apertures (0.55 × 0.75 mm) accommodate AH1809-W-7 without retooling, verified by Diodes' AP02002 package drawing.
AH1809-W-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:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±18.5mT Trip, ±17mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 2.5mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH1809-W-7 FAQ
1.How can I place an order for AH1809-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1809-W-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 AH1809-W-7 reliable?
The price and inventory of AH1809-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1809-W-7 is usually 5 days.
3.What payment methods are accepted for AH1809-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1809-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1809-W-7?
AH1809-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1809-W-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 AH1809-W-7?
For technical support, including AH1809-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1809-W-7 requirements.
6.How does Aetrix verify that AH1809-W-7 is sourced from the original manufacturer or authorized distributors?
All AH1809-W-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 AH1809-W-7 meets industry standards.
7.What is the process for return or replacement of AH1809-W-7?
All AH1809-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1809-W-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 AH1809-W-7 part is unused and in its original packaging.
Return procedure for AH1809-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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