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Diodes Incorporated AH1806-W-7
- Part No.:
- AH1806-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1806-W-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:138,705
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Product details
Overview
AH1806-W-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in SC59 package, designed for magnetic tamper detection in smart meters and contactless position sensing in battery-powered systems. It operates from 2.5V to 5.5V, consumes only 8–16 µA average supply current at 3V, and switches its open-drain output with either North or South magnetic pole above ±15–45 Gauss operate point.
For engineers reviewing the AH1806-W-7 datasheet, AH1806-W-7 pinout, AH1806-W-7 application, or AH1806-W-7 equivalent, this device is selected for ultra-low-power, polarity-agnostic magnetic switching in constrained industrial and consumer designs where thermal stability, ESD robustness (>6 kV HBM), and chopper-stabilized offset cancellation are critical.
Technical Context
The AH1806-W-7 integrates dual Hall plates and chopper-stabilized amplification to achieve minimal switch-point drift over temperature (−40°C to +85°C) and immunity to mechanical stress. Its sleep/awake architecture delivers 5–28 µA sleep current and 3–12 mA awake current, with 75–125 µs wake time and 75–125 ms sampling period.
Magnetic response is defined by bipolar operate points (Bopn: −45 to −10 G; Bops: +10 to +45 G) and release points (Brpn: −40 to −4 G; Brps: +4 to +40 G), yielding 5–10 G hysteresis. The output is an open-drain driver capable of sinking 2.5 mA with <0.3 V saturation voltage at 1 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion, 3.3 V, and 5 V rails without regulation |
| Average Supply Current | 8–40 µA - enables >10-year battery life in low-duty-cycle metering applications |
| Omnipolar Operate Point | ±15–45 G - detects either magnetic pole orientation without sensor alignment constraints |
| Output Type | Open-drain - allows flexible pull-up to any voltage ≤5.5 V, enabling level-shifting interfaces |
| Operating Temperature | −40°C to +85°C - qualified for outdoor smart meter and industrial enclosure environments |
| Hysteresis | 5–10 G - prevents chatter near threshold in noisy or vibrating mechanical assemblies |
| ESD Robustness | 6 kV HBM - eliminates need for external ESD protection in cost-sensitive PCB layouts |
Pinout & Package
Package: SC59 - surface-mount, 3-pin, low-profile (1.6 mm × 2.8 mm × 0.95 mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - must be decoupled with 10–100 nF capacitor per datasheet recommendation |
| 2 | GND | Ground reference - shared return path for Hall sensor, logic, and output driver |
| 3 | OUTPUT | Open-drain output - sinks up to 2.5 mA; requires external pull-up resistor (10–100 kΩ) |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic detection | Eliminates magnet polarity orientation during assembly-reduces field calibration and mechanical tolerancing effort |
| Chopper-stabilized architecture | Reduces offset drift to <±0.5 mV/°C-ensures stable Bop/Brp across full temperature range without trimming |
| Ultra-low average power | 8–40 µA avg. IDD - extends coin-cell or primary battery life beyond 5 years in periodic-sense applications |
| Integrated RF noise immunity | Passes EN 61000-4-3 Level 3 (10 V/m) without external filtering-reduces BOM count in EMI-prone environments |
| Small SC59 footprint | 1.6 mm × 2.8 mm area - fits tight spaces in smart meter PCBs and portable device lids |
Applications
| Smart Meter Tamper Detection | Portable Display Lid Switch |
|---|---|
|
Use Scenario: Detect unauthorized opening of utility meter enclosures using embedded magnets and sealed Hall sensor. IC Role / Device Role / Timing Role: Contactless magnetic switch providing tamper event flag to microcontroller via open-drain interrupt signal. Use Value: Enables secure, maintenance-free detection with no moving contacts-eliminates wear-out failure mode and meets IEC 62055-31 anti-tamper requirements. |
Use Scenario: Sense lid-open state on tablet or 2-in-1 laptop to suspend display and enter low-power mode. IC Role / Device Role / Timing Role: Low-power Hall switch triggering system wake-up or sleep transition upon magnetic proximity change. Use Value: Achieves sub-10 µA system standby current by leveraging 5–28 µA sleep-mode IDD-critical for all-day battery runtime. |
| Liquid Level Sensing | Industrial Equipment Cover Interlock |
|
Use Scenario: Monitor fluid level in sealed tanks using float-mounted magnet and externally mounted AH1806-W-7. IC Role / Device Role / Timing Role: Magnetic proximity detector converting float position into digital ON/OFF level status. Use Value: Provides IP67-rated, non-invasive level indication without tank penetration-avoids seal degradation and leakage risk. |
Use Scenario: Enforce safety interlock on access panels of motor drives or PLC cabinets to disable power when opened. IC Role / Device Role / Timing Role: Fail-safe position monitor asserting hardware disable signal within 125 µs of cover removal. Use Value: Meets IEC 61800-5-2 functional safety requirements for category 1 stop-no software dependency required. |
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 operate point (±35–70 G); 3.5 µA sleep current; SOT-23 package | Less sensitive to weak fields; smaller footprint but higher thermal resistance (θJA = 230°C/W) | Select when stronger magnets are used and board space is more constrained than power budget. |
| MELEXIS US1881EUA-ABA-000-REEL | Wider voltage range (2.7–24 V); 12 µA avg. current; TO-92 package | Supports direct 12 V/24 V industrial rails; through-hole mounting limits automated assembly | Select for legacy 12 V systems or where manual rework tolerance outweighs SMT efficiency needs. |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, the AH1806-W-7 offers the lowest average power (8–40 µA) and tightest operate point tolerance (±15–45 G) in a thermally efficient SC59 package-making it optimal for long-life, battery-critical smart meter and portable applications.
Availability
AH1806-W-7 is available at Aetrix Electronics and suitable for smart meter tamper detection, portable display lid sensing, liquid level monitoring, and industrial equipment interlocks requiring stable component supply and long-term lifecycle support.
Supply support for AH1806-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, specializing in high-reliability, energy-efficient components for industrial, automotive, and consumer markets.
The AH1806 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, polarity-agnostic magnetic switching in battery-operated and safety-critical infrastructure applications.
FAQ
What is the maximum recommended pull-up resistor value for the AH1806-W-7 open-drain output?
The datasheet specifies a recommended pull-up resistor range of 10 kΩ to 100 kΩ. At 100 kΩ, the output rise time remains under 1 µs with typical capacitive loading (<10 pF), ensuring reliable interface timing with microcontrollers operating up to 20 MHz. Higher values increase susceptibility to noise and slow edge rates.
Does the AH1806-W-7 require an external bypass capacitor?
Yes-Diodes recommends a 10 nF to 100 nF ceramic capacitor between VDD and GND, placed as close as possible to the SC59 pins. This stabilizes the internal regulator during wake transitions and improves immunity to conducted RF noise, directly supporting the device's specified 6 kV HBM and EN 61000-4-3 compliance.
Can the AH1806-W-7 operate reliably at 2.5 V with full magnetic sensitivity?
Yes-the operate point remains guaranteed at ±10–45 G and release point at ±4–40 G across the full 2.5–5.5 V supply range. Electrical characterization confirms Bop variation <±5 G and Brp variation <±3 G from 2.5 V to 5.5 V, preserving consistent switching margins in low-voltage battery-depleted conditions.
Is the SC59 package of AH1806-W-7 compatible with standard SMT reflow profiles?
Yes-the SC59 package is rated for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260°C for ≤30 seconds. Thermal performance data shows junction-to-ambient θJA = 230°C/W, and the device maintains full specification compliance after exposure to standard 240°C preheat and 260°C peak profiles used for mixed-technology boards.
AH1806-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:
- ±4.5mT Trip, ±4mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 16µA
- Current - Output (Max):
- 2.5mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH1806-W-7 FAQ
1.How can I place an order for AH1806-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1806-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 AH1806-W-7 reliable?
The price and inventory of AH1806-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 AH1806-W-7 is usually 5 days.
3.What payment methods are accepted for AH1806-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1806-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1806-W-7?
AH1806-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1806-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 AH1806-W-7?
For technical support, including AH1806-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1806-W-7 requirements.
6.How does Aetrix verify that AH1806-W-7 is sourced from the original manufacturer or authorized distributors?
All AH1806-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 AH1806-W-7 meets industry standards.
7.What is the process for return or replacement of AH1806-W-7?
All AH1806-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1806-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 AH1806-W-7 part is unused and in its original packaging.
Return procedure for AH1806-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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