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Diodes Incorporated AH1808-Z-7
- Part No.:
- AH1808-Z-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-553
- Datasheet:
-
AH1808-Z-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR SOT553
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
AH1808-Z-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in SOT553 package. It detects magnetic fields from either North or South poles, operates from 2.5V to 5.5V, consumes only 5–10 µA in sleep mode at +25°C, and features 20–60 Gauss operate point (Bop) for reliable contactless switching in battery-powered systems.
For engineers reviewing the AH1808-Z-7 datasheet, AH1808-Z-7 pinout, AH1808-Z-7 application, or AH1808-Z-7 equivalent, this device is selected for low-power magnetic position sensing where supply voltage range, magnetic sensitivity tolerance, temperature stability, and open-drain output compatibility with microcontroller GPIOs are critical design factors.
Technical Context
The AH1808-Z-7 uses dual Hall plates with chopper-stabilized architecture to cancel offset drift and ensure stable switching thresholds across -40°C to +85°C. Its sleep/awake duty cycle (0.1% typical) enables ultra-low average current draw (8–16 µA at 3V).
It implements latched logic with built-in hysteresis (5–10 Gauss), delivering robust immunity to mechanical vibration and EMI. The single open-drain output requires an external pull-up resistor (10kΩ–100kΩ) and supports sink currents up to 2.5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - compatible with Li-ion, coin cell, and 3.3V/5V system rails |
| Sleep Current | 5–10 µA @ +25°C - enables multi-year battery life in tamper-detection applications |
| Operate Point (Bop) | 20–60 Gauss - detects weak magnets at >3 mm air gap in smart meter enclosures |
| Hysteresis (Bhy) | 5–10 Gauss - prevents chatter during slow magnet approach or thermal drift |
| Output Type | Open-drain - interfaces directly with 1.8V–5.5V logic without level-shifting |
| ESD Rating | >6 kV HBM - survives handling and assembly without additional protection circuitry |
| Operating Temp | -40°C to +85°C - qualified for industrial and outdoor metering environments |
Pinout & Package
SOT553 is a 5-pin, low-profile surface-mount package with two no-connect (NC) pins. Pin 1 and Pin 3 are NC and may be left floating or grounded; Pin 2 is GND; Pin 4 is VDD; Pin 5 is OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connection | Internally unconnected - no electrical function; may be tied to GND for mechanical stability |
| Pin 2 | GND | Reference ground for Hall sensor and output driver - must be low-impedance path to system ground |
| Pin 3 | No Connection | Internally unconnected - no routing or decoupling required |
| Pin 4 | VDD | Power input - requires 10nF–100nF ceramic bypass capacitor near pin for noise immunity |
| Pin 5 | OUTPUT | Open-drain output - sinks current when active; requires external pull-up to logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic detection | Responds to either North or South pole - eliminates magnet orientation constraints in mechanical assemblies |
| Chopper-stabilized architecture | Reduces offset drift to <0.1 mV/°C - maintains Bop/Brp stability over full temperature range |
| Micropower sleep mode | 24 µW typical power at 3V - enables operation on CR2032 for >5 years in intermittent-sense applications |
| RF noise immunity | Validated against 100 MHz–1 GHz RF fields - prevents false triggers in wireless-enabled smart meters |
| Lead-free & green packaging | Meets RoHS 3, halogen-free (<900 ppm Br+Cl), antimony-free - compliant for global consumer and industrial shipments |
Applications
| Smart Meter Tamper Detection | Lid/Door Position Sensing |
|---|---|
Use Scenario: Detecting unauthorized enclosure opening in utility smart meters using embedded magnet and reed-switch replacement. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing tamper event flag to meter's MCU via open-drain interrupt line. Use Value: 20–60 Gauss operate point ensures reliable actuation through plastic housing; 5–10 µA sleep current extends battery backup life beyond 10 years. | Use Scenario: Monitoring closure state of laptop lid, tablet cover, or appliance door in portable equipment. IC Role / Device Role / Timing Role: Low-power proximity detector triggering system suspend/resume via GPIO wake signal. Use Value: Omnipolar operation allows use of low-cost ferrite magnets; SOT553 footprint minimizes PCB area vs. SC59 or SIP-3 alternatives. |
| Liquid Level Detection | On/Off Switch for Cameras & PDAs |
Use Scenario: Detecting coffee level in drip machines or detergent volume in washing machines using float-mounted magnet. IC Role / Device Role / Timing Role: Contactless level threshold indicator driving status LED or MCU input. Use Value: 5–10 Gauss hysteresis prevents oscillation near transition point; -40°C to +85°C rating covers appliance thermal cycling. | Use Scenario: Power-on activation in digital cameras or handheld PDAs when sliding cover is removed. IC Role / Device Role / Timing Role: Wake-up sensor enabling zero-power standby until user interaction. Use Value: 75–125 µs awake time ensures sub-millisecond response; 2.5V minimum supply supports aging batteries down to 2.6V. |
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 |
|---|---|---|---|
| AL33035Q-7 | Higher Bop (35–75 Gauss); 1.6–5.5V supply; 1.2 µA sleep current | Better suited for high-temperature automotive under-hood use (-40°C to +125°C) | Select if extended temperature range or lower sleep current outweighs cost premium |
| TMAG5170AHQ1 | 3-axis linear Hall sensor with SPI interface; 2.7–3.6V; 1.5 mA active current | Provides analog field strength data - not a drop-in switch replacement | Choose only when directional sensing or field magnitude measurement is required |
Compared with AL33035Q-7 and TMAG5170AHQ1, the AH1808-Z-7 delivers optimal balance of ultra-low power, wide supply range, and true omnipolar switching in compact SOT553 - making it ideal for cost-sensitive, battery-constrained industrial and consumer position sensing where digital on/off output suffices.
Availability
AH1808-Z-7 is available at Aetrix Electronics and suitable for smart meter tamper detection, lid/door position sensing, liquid level detection, and portable device on/off switching requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AH1808-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 ICs, specializing in high-reliability, energy-efficient components for industrial, computing, and consumer markets.
The AH1808 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, contactless position and proximity detection in battery-operated and energy-conscious systems.
FAQ
What is the recommended pull-up resistor value for the AH1808-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 and noise margin for 3.3V or 5V logic, while 100 kΩ minimizes current draw in high-impedance monitoring circuits. Values outside this range may cause slow switching or excessive power loss.
Does the AH1808-Z-7 require an external bypass capacitor?
Yes - a 10 nF to 100 nF ceramic capacitor must be placed between VDD and GND, as close as possible to the device pins. This stabilizes the internal regulator, suppresses supply noise, and improves RF immunity per the functional block diagram and typical application circuit in the datasheet.
Can the AH1808-Z-7 operate reliably at 2.5V supply?
Yes - the device is fully specified down to 2.5V. At this minimum voltage, the sleep current remains ≤28 µA over -40°C to +85°C, and the operate point stays within 20–60 Gauss. Performance validation includes characterization across the entire 2.5V–5.5V range per Recommended Operating Conditions table.
How does the SOT553 package differ electrically from SC59 or SIP-3 variants of AH1808?
Electrically identical - all AH1808 variants share the same die, specifications, and functionality. SOT553 differs only mechanically: it has five pins (two NC), smaller footprint (1.6 × 1.6 mm), and lower thermal resistance than SIP-3. No electrical derating or parameter change is required when substituting packages.
AH1808-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:
- ±6mT Trip, ±5mT Release
- Test Condition:
- -40°C ~ 85°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:
- SOT-553
AH1808-Z-7 FAQ
1.How can I place an order for AH1808-Z-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1808-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 AH1808-Z-7 reliable?
The price and inventory of AH1808-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 AH1808-Z-7 is usually 5 days.
3.What payment methods are accepted for AH1808-Z-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1808-Z-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1808-Z-7?
AH1808-Z-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1808-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 AH1808-Z-7?
For technical support, including AH1808-Z-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1808-Z-7 requirements.
6.How does Aetrix verify that AH1808-Z-7 is sourced from the original manufacturer or authorized distributors?
All AH1808-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 AH1808-Z-7 meets industry standards.
7.What is the process for return or replacement of AH1808-Z-7?
All AH1808-Z-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1808-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 AH1808-Z-7 part is unused and in its original packaging.
Return procedure for AH1808-Z-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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