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Diodes Incorporated AH1809-Z-7
- Part No.:
- AH1809-Z-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-553
- Datasheet:
-
AH1809-Z-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR SOT553
- Quantity:
- Payment:
- Shipping:
Inventory:47,010
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Product details
Overview
AH1809-Z-7 from Diodes Incorporated is a low-sensitivity, micropower omnipolar Hall-effect switch IC in SOT553 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 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-Z-7 datasheet, AH1809-Z-7 pinout, AH1809-Z-7 application, or AH1809-Z-7 equivalent, key selection considerations include its chopper-stabilized architecture for thermal stability, -40°C to +125°C operation, 24 µW power budget at 3V, and SOT553 footprint compatibility with space-constrained industrial and consumer PCB layouts.
Technical Context
The AH1809-Z-7 integrates dual Hall plates and chopper stabilization to suppress offset drift and enhance immunity to mechanical stress and temperature variation. Its magnetic switching thresholds (BOP/BRP) are specified across -40°C to +125°C, with hysteresis of 10–20 Gauss at +25°C - ensuring robust bounce-free detection in noisy environments.
It features a single open-drain output capable of sinking up to 2.5 mA, requiring an external pull-up resistor (10kΩ–100kΩ). The device alternates between ultra-low-power sleep mode (5–10 µA typical at +25°C) and brief awake periods (75–125 µs), achieving <40 µA max average current over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V - supports direct connection to Li-ion, coin-cell, or 3.3V/5V system rails without regulation. |
| Average Supply Current | 8–16 µA @ +25°C, 3V - enables multi-year battery life in sealed smart meter modules. |
| Operating Temperature | -40°C to +125°C - qualified for industrial metering enclosures and outdoor utility installations. |
| Magnetic Operate Point (BOP) | ±100 to ±165 Gauss - low sensitivity prevents false triggers from stray fields while enabling detection through thick housings. |
| Hysteresis (BHY) | 10–20 Gauss - ensures clean, chatter-free switching during slow magnetic transitions (e.g., door closure). |
| Output Type | Open-drain - allows flexible voltage-level translation and wired-OR configuration with other sensors. |
| ESD Rating | 6 kV HBM - withstands handling and assembly without additional protection circuitry. |
Pinout & Package
Package: SOT553 - 1.6 mm × 1.6 mm × 0.6 mm low-profile surface-mount package with exposed pad for thermal performance and board-space efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; may be left floating or tied to GND for mechanical stability. |
| 2 | GND | Ground reference for analog core and output stage; must be low-impedance for noise immunity. |
| 3 | NC | No internal connection; same as Pin 1 - no electrical function. |
| 4 | VDD | Power input; requires 10nF–100nF bypass capacitor near pin for stable chopper operation. |
| 5 | OUTPUT | Open-drain output; sinks up to 2.5 mA; requires external pull-up to logic rail (e.g., 10kΩ to 3.3V). |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic activation | Responds identically to North or South pole - simplifies mechanical design by eliminating magnet orientation constraints. |
| Chopper-stabilized architecture | Reduces offset drift to <±0.5 mV/°C - maintains consistent BOP/BRP across temperature without calibration. |
| Ultra-low-power sleep mode | 5–10 µA typical IDD(sleep) at +25°C - extends battery life in intermittent-sensing applications like lid-open detection. |
| RF noise immunity | Validated against common industrial RF sources - eliminates need for shielding or filtering in EMI-prone metering environments. |
| Green packaging | Halogen- and antimony-free, fully RoHS-compliant SOT553 - meets global environmental compliance requirements for export. |
Applications
| Smart E-Meter Tamper Detection | Industrial Door Position Sensing |
|---|---|
Use Scenario: Detect unauthorized enclosure opening in utility smart meters using embedded magnets on cover latches. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing contactless, wear-free status indication with hysteresis to prevent vibration-induced toggling. Use Value: Enables tamper-event logging with <16 µA average current draw - preserving 10+ year battery life in sealed meter units. |
Use Scenario: Monitor safety-critical access doors on industrial control cabinets or HVAC enclosures. IC Role / Device Role / Timing Role: Low-power magnetic position sensor interfacing directly with microcontroller GPIO via open-drain output. Use Value: Operates reliably from -40°C to +125°C and withstands ESD events up to 6 kV - reducing field failure rates in harsh environments. |
| Consumer Appliance Lid Switch | Proximity-Based On/Off Control |
Use Scenario: Replace mechanical microswitches in washing machine detergent dispensers or coffee maker water tanks. IC Role / Device Role / Timing Role: Solid-state proximity detector activated by magnet embedded in moving lid or tray. Use Value: Eliminates contact wear and bounce; BOP tolerance accommodates manufacturing gap variance up to ±0.5 mm. |
Use Scenario: Enable hands-free power-on in portable medical devices or IoT sensors when a magnet-equipped accessory is docked. IC Role / Device Role / Timing Role: Micropower wake-up trigger that initiates system boot sequence upon magnetic approach. Use Value: Draws <10 µA in sleep - allows always-on readiness without compromising standby battery duration. |
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 |
|---|---|---|---|
| AL33035QRTT-7 | Higher sensitivity (BOP ±35 Gauss); 1.6–5.5V supply; 3.5 µA avg current; SOT23-3 package. | Better suited for thin-gap or weak-field detection but less immune to stray fields in dense PCB layouts. | Select when detecting small magnets at >3 mm air gap; avoid where ambient field interference is likely. |
| US1881EUA-12 | Unipolar (South-only) operation; 2.5–24V supply; 4 mA output sink; TO-92 package. | Larger footprint and higher power consumption; not suitable for space- or energy-constrained designs. | Choose only for legacy through-hole upgrades or high-voltage industrial rails beyond 5.5V. |
Compared with AL33035QRTT-7 and US1881EUA-12, the AH1809-Z-7 uniquely balances low sensitivity, micropower operation, and SOT553 miniaturization - making it optimal for battery-powered, space-limited, and EMI-resilient applications where magnet polarity cannot be controlled.
Availability
AH1809-Z-7 is available at Aetrix Electronics and suitable for smart e-meter production, industrial tamper-protection systems, and consumer appliance position sensing requiring stable component supply and long-term lifecycle support.
Supply support for AH1809-Z-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 integrated circuits, specializing in high-reliability, energy-efficient components for industrial, automotive, and consumer markets.
The AH1809 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, contactless position and proximity detection in battery-operated and thermally demanding applications.
FAQ
What is the recommended pull-up resistor value for the AH1809-Z-7 open-drain output?
The datasheet specifies a recommended pull-up resistor range of 10 kΩ to 100 kΩ. A 10 kΩ resistor ensures fast rise time (<1 µs) and strong noise immunity for 3.3V or 5V logic interfaces, while 100 kΩ minimizes current draw in ultra-low-power systems - with typical output leakage <0.1 µA guaranteeing valid high state.
Can the AH1809-Z-7 operate reliably at 2.5V supply voltage across its full temperature range?
Yes. The device is fully characterized for 2.5V to 5.5V operation across -40°C to +125°C. At 2.5V and -40°C, maximum average supply current remains ≤40 µA, and magnetic operate point is guaranteed ≥±90 Gauss - meeting specification limits for industrial metering applications.
Why does the SOT553 package have two NC pins, and how should they be handled on the PCB?
Pins 1 and 3 in the SOT553 package are internally unconnected. They may be left floating or tied to GND for mechanical reinforcement and thermal dissipation. No electrical function is affected, and soldering either configuration complies with IPC-A-610 Class 2 standards for automated assembly.
How does the chopper stabilization in the AH1809-Z-7 improve performance versus non-chopped Hall switches?
Chopper stabilization reduces input offset voltage drift to <±0.5 mV/°C and minimizes 1/f noise, resulting in stable BOP/BRP values across temperature and time. This eliminates the need for system-level calibration and prevents false triggering due to thermal gradients - critical for unattended smart meter deployments.
AH1809-Z-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-553
- 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:
- SOT-553
AH1809-Z-7 FAQ
1.How can I place an order for AH1809-Z-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1809-Z-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-Z-7 reliable?
The price and inventory of AH1809-Z-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-Z-7 is usually 5 days.
3.What payment methods are accepted for AH1809-Z-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1809-Z-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1809-Z-7?
AH1809-Z-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1809-Z-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-Z-7?
For technical support, including AH1809-Z-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1809-Z-7 requirements.
6.How does Aetrix verify that AH1809-Z-7 is sourced from the original manufacturer or authorized distributors?
All AH1809-Z-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-Z-7 meets industry standards.
7.What is the process for return or replacement of AH1809-Z-7?
All AH1809-Z-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1809-Z-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-Z-7 part is unused and in its original packaging.
Return procedure for AH1809-Z-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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