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Diodes Incorporated AH1912-W-7
- Part No.:
- AH1912-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1912-W-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:25,789
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Product details
Overview
AH1912-W-7 from Diodes Incorporated is an ultra-low power digital omnipolar Hall-effect switch IC designed for battery-constrained sensing applications. It operates from 1.6V to 5.5V, draws only 1.6μA average supply current at 3V, features ±30G typical operate points (BOP), and switches on with either north or south magnetic polarity. It is used in gas/water meters, smart covers, smoke detectors, and IoT endpoint sensors.
For engineers reviewing the AH1912-W-7 datasheet, AH1912-W-7 pinout, AH1912-W-7 application, or AH1912-W-7 equivalent, key selection criteria include its 1.6μA average current draw, omnipolar magnetic sensitivity (±21–39 G), SC59 package compatibility, chopper-stabilized temperature stability, and absence of external pull-up requirement.
Technical Context
The AH1912 employs a hibernating clocking system that alternates between ultra-low-power sleep mode (0.6–1 μA) and brief awake cycles (45 μs typical), enabling microamp-level average current consumption. Its chopper-stabilized architecture cancels offset drift, delivering <7 G hysteresis and stable BOP/BRP over –40°C to +85°C.
Magnetic actuation is polarity-agnostic: output pulls low when perpendicular flux density exceeds +21 G (south pole) or –21 G (north pole); release occurs at +14 G or –14 G. The open-drain output requires no external pull-up and supports direct interface with 1.6V–5.5V logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6V to 5.5V - enables direct connection to coin-cell, Li-ion, or low-voltage MCU I/O rails without regulation |
| Avg. Supply Current | 1.6μA at 3V - extends 10-year battery life in utility meters and smoke alarms |
| Operate Point (BOP) | ±21–39 G - detects weak magnets at >3 mm air gap in compact enclosures |
| Hysteresis (BHY) | 2–7 G - prevents chatter near threshold in vibrating or noisy mechanical environments |
| ESD Rating | 6 kV HBM - eliminates need for external ESD protection in consumer and industrial PCB layouts |
| Output Type | Open-drain - simplifies interfacing with any logic family; no pull-up resistor required |
| Operating Temp | –40°C to +85°C - validated for outdoor metering and uncontrolled indoor appliance environments |
Pinout & Package
Package: SC59 (SOT-23 variant), 3-pin, surface-mount, lead-free, RoHS-compliant. Exposed pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply input | Accepts 1.6–5.5V; internal regulator powers analog core and digital logic |
| 2 OUTPUT | Open-drain output | Sinks up to 1 mA; pulled low during magnetic activation; high-impedance otherwise |
| 3 GND | Ground reference | Return path for supply and output current; must be low-impedance for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic detection | Activates with either N- or S-pole - eliminates magnet orientation constraints in assembly |
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to <±0.5 G/°C - ensures consistent trip points across temperature |
| No external pull-up required | Integrated output stage drives logic directly - saves board space and BOM cost |
| RF noise immunity | Validated against 100 MHz–1 GHz RF fields - maintains reliable operation near wireless modules |
| Low-profile SC59 package | Max height 1.1 mm - fits under thin bezels in smartphones and wearables |
Applications
| Smart Cover Detection | Remote Utility Metering |
|---|---|
Use Scenario: Detect lid closure on tablet PC or clamshell phone using embedded magnet and PCB-mounted Hall sensor. IC Role / Device Role / Timing Role: Digital position switch providing wake/sleep control signal to host processor. Use Value: Enables zero-power standby via 1.6μA avg. current; SC59 footprint allows placement near hinge without mechanical interference. |
Use Scenario: Monitor dial rotation or turbine flow in battery-powered gas/water meters deployed for >10 years. IC Role / Device Role / Timing Role: Magnetic event counter input with hysteresis filtering to reject vibration-induced false triggers. Use Value: Stable BOP/BRP over –40°C to +85°C ensures accuracy across seasonal temperature swings; 6 kV ESD withstands field handling. |
| IoT End-Point Sensing | Smoke Detector Door Interlock |
Use Scenario: Monitor door/window status in battery-powered security nodes transmitting via NB-IoT or LoRaWAN. IC Role / Device Role / Timing Role: Low-duty-cycle wake trigger for ultra-low-power microcontroller and radio subsystem. Use Value: 45 μs awake time minimizes active energy per event; 3000-unit tape-and-reel packaging supports automated SMT production. |
Use Scenario: Confirm battery compartment or test-button cover is properly closed before arming smoke alarm self-test. IC Role / Device Role / Timing Role: Safety-critical proximity switch verifying mechanical enclosure integrity. Use Value: Omnipolar operation tolerates magnet misalignment during high-volume assembly; no external components reduce failure modes. |
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 A1174LLHLT-T | Higher avg. current (4.5μA), bipolar-only (N-pole only), SOIC-8 package | Requires precise magnet polarity alignment; less suitable for high-volume consumer assembly | Select if higher output drive (20mA sink) and SOIC thermal mass are prioritized over battery life |
| MELEXIS US5881LUA-ABA-000-REEL | Lower sensitivity (BOP = ±35G min), 2.7–24V supply, TSOT-23 package | Designed for industrial 24V systems; not optimized for sub-2V coin-cell operation | Select for wide-input industrial controls where 1.6V start-up and microamp sleep are not required |
Compared with A1174LLHLT-T and US5881LUA-ABA-000-REEL, the AH1912-W-7 uniquely balances ultra-low quiescent current, true omnipolarity, and 1.6V operation-making it optimal for long-life, high-assembly-yield battery endpoints where magnet orientation cannot be controlled.
Availability
AH1912-W-7 is available at Aetrix Electronics and suitable for remote utility metering, smart cover detection, and IoT endpoint sensing requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for AH1912-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 power management, signal integrity, and sensing solutions for industrial, consumer, and automotive markets.
The AH1912 belongs to Diodes' Hall-effect switch portfolio, engineered specifically for ultra-low-power magnetic sensing in battery-operated endpoints-emphasizing longevity, robustness, and ease of integration.
FAQ
What is the minimum operating voltage for reliable magnetic switching?
The AH1912-W-7 guarantees full functionality-including specified BOP/BRP thresholds and timing-from 1.6V to 5.5V. At 1.6V, typical operate point remains ±21 G, and average current stays ≤9 μA across –40°C to +85°C, making it viable for single alkaline or lithium primary cells.
Does the SC59 package require thermal pad connection?
No. The SC59 package has no internal connection to the exposed pad. Per Diodes' datasheet, the pad may be left unconnected or tied to GND for mechanical stability-no thermal or electrical benefit is gained from soldering it to a copper pour.
Can the AH1912-W-7 replace a reed switch in existing designs?
Yes-its open-drain output, 1.6V–5.5V compatibility, and 1 mA sink capability allow direct substitution for reed switches driving microcontroller GPIOs. Unlike reed switches, it offers superior shock/vibration resistance, no contact wear, and guaranteed 10+ year operational life.
Is an input capacitor required for stable operation?
Yes. A 100 nF ceramic capacitor (X7R, 0603) is recommended between VDD and GND, placed within 2 mm of the VDD pin. This stabilizes internal rail during wake cycles and improves RF noise immunity-omitting it risks erratic switching under EMI exposure.
AH1912-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:
- ±4.2mT Trip, ±3.3mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 1.6V ~ 5.5V
- Current - Supply (Max):
- 3µA
- Current - Output (Max):
- 1mA
- Output Type:
- Push-Pull
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH1912-W-7 FAQ
1.How can I place an order for AH1912-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1912-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 AH1912-W-7 reliable?
The price and inventory of AH1912-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 AH1912-W-7 is usually 5 days.
3.What payment methods are accepted for AH1912-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1912-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1912-W-7?
AH1912-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1912-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 AH1912-W-7?
For technical support, including AH1912-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1912-W-7 requirements.
6.How does Aetrix verify that AH1912-W-7 is sourced from the original manufacturer or authorized distributors?
All AH1912-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 AH1912-W-7 meets industry standards.
7.What is the process for return or replacement of AH1912-W-7?
All AH1912-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1912-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 AH1912-W-7 part is unused and in its original packaging.
Return procedure for AH1912-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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