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Diodes Incorporated AH9249NTR-G1
- Part No.:
- AH9249NTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH9249NTR-G1.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
AH9249NTR-G1 from Diodes Incorporated is an ultra-sensitive, micropower omnipolar Hall-effect switch with latched digital output, designed for battery-powered handheld equipment including notebook cover detection and low-duty-cycle magnet-actuated wake switches. It operates from 2.5V to 5.5V, draws only 6–10 μA in sleep mode, and features chopper-stabilized magnetic switching with ±30–55 G operating points and 10 G hysteresis.
For engineers reviewing the AH9249NTR-G1 datasheet, AH9249NTR-G1 pinout, AH9249NTR-G1 application, or AH9249NTR-G1 equivalent, key selection criteria include its omnidirectional pole sensitivity, sub-15 μA average current, TO-92S/SOT-23/DFN package options, built-in pull-up resistor, and NRND status requiring design migration planning.
Technical Context
The AH9249 implements a chopper-stabilized Hall sensor with sleep/awake timing logic to reduce average current consumption. Its comparator uses bipolar magnetic thresholds (BOPN/BOPS and BRPN/BRPS) enabling activation by either north or south pole, with hysteresis ensuring noise immunity.
Internal biasing, Hall plate sensing, and output latch are integrated in a single CMOS die. The device transitions between awake mode (150 μs response) and sleep mode (90–120 ms duration), maintaining output state during sleep while reducing supply current to ≤10 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - supports single-cell Li-ion or dual-cell alkaline battery operation without regulation |
| Average Current | 10–15 μA - enables multi-year battery life in low-duty-cycle wake-switch applications |
| Omnipolar BOP | ±30–55 G - detects either magnetic pole orientation without mechanical polarity alignment |
| Hysteresis | 10 G - prevents chatter near switching threshold under fluctuating or noisy fields |
| Sleep Current | 6–10 μA - maintains latched output state while minimizing quiescent power draw |
| Awake Time | 150 μs - ensures responsive detection of fast-moving magnets (e.g., clamshell lid closure) |
| Output Type | Open-drain with internal pull-up - simplifies PCB layout and eliminates external resistor requirement |
Pinout & Package
AH9249NTR-G1 is packaged in SOT-23-3, a surface-mount plastic case measuring 2.95 × 2.82 × 1.45 mm with gull-wing leads. Pin 1 (VCC) and Pin 3 (GND) provide power and reference; Pin 2 (OUTPUT) delivers open-drain latched signal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply input - must be decoupled with ≥10 nF capacitor near package |
| 2 | OUTPUT | Open-drain latched output - sinks up to 1 mA; pulled high internally to VCC |
| 3 | GND | Ground reference - connects to system ground plane for stable Hall sensing |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic detection | Enables use with unmarked or bidirectionally installed magnets-no polarity orientation required during assembly |
| Chopper stabilization | Compensates for offset drift over temperature and time, maintaining ±5 G BOP stability from –40°C to +85°C |
| Integrated pull-up resistor | Eliminates need for external pull-up, reducing BOM count and board space in space-constrained handheld designs |
| ESD robustness | 4000 V HBM / 600 V MM rating - withstands handling and system-level ESD events without protection diodes |
| Green RoHS compliance | Lead-free, halogen-free, antimony-free construction - meets EU Directive 2011/65/EU and JEDEC JS709C |
Applications
| Cover Switch in Notebook PC | Handheld Wireless Awake Switch |
|---|---|
|
Use Scenario: Detects lid open/close state in ultraportable notebooks and tablets. IC Role / Device Role / Timing Role: Latched Hall switch providing persistent ON/OFF state during sleep cycles. Use Value: Enables instant wake-from-sleep on lid opening while consuming <15 μA average current. |
Use Scenario: Activates Bluetooth/WiFi subsystem when user removes device from holster or pocket. IC Role / Device Role / Timing Role: Magnet-actuated wake trigger with 150 μs response and automatic sleep re-entry. Use Value: Extends standby battery life by >30% compared to always-on proximity sensors. |
| Magnet Switch in Low Duty Cycle Applications | Clamshell Phone Position Detection |
|
Use Scenario: Monitors position of industrial control panel doors or medical device access covers. IC Role / Device Role / Timing Role: Omnipolar latching switch with 10 G hysteresis for reliable edge detection. Use Value: Eliminates false triggers from vibration or stray fields in infrequently operated enclosures. |
Use Scenario: Determines flip-open status in legacy feature phones and ruggedized communication devices. IC Role / Device Role / Timing Role: Bidirectional pole detection enabling compact, symmetric magnet placement. Use Value: Reduces mechanical assembly complexity by removing magnet polarity marking requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latching switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH9247 | Same pinout and function but higher BOP (±45–70 G); no sleep mode - continuous 2–4 mA operation | Not suitable for battery-critical applications; used where faster response or higher field immunity is needed | Select AH9247 only if average current >10 μA is acceptable and magnetic environment exceeds ±55 G |
| AL3320EUTRT | Lower sensitivity (BOP ±60–100 G); no chopper stabilization; 3.3V-only supply; 1.5 μA sleep current | Requires stronger magnets; lacks temperature stability across –40°C to +85°C range | Prefer AL3320EUTRT only when ultra-low sleep current is primary requirement and field strength is consistently >60 G |
Compared with AH9249NTR-G1, AH9247 sacrifices battery life for higher magnetic immunity, while AL3320EUTRT trades sensitivity and thermal stability for lower sleep current - making AH9249NTR-G1 the optimal balance for general-purpose low-power omnipolar switching.
Availability
AH9249NTR-G1 is available at Aetrix Electronics and suitable for notebook cover detection, handheld wireless wake switching, and low-duty-cycle magnet actuation requiring stable component supply and long-term lifecycle support.
Supply support for AH9249NTR-G1 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 consumer, industrial, and automotive markets.
AH9249 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, battery-operated portable electronics requiring reliable magnetic presence detection with minimal footprint and BOM impact.
FAQ
Is AH9249NTR-G1 pin-compatible with other Diodes Hall switches?
AH9249NTR-G1 shares the SOT-23-3 pinout (VCC–OUTPUT–GND) with AH9247 and AH9250, but functional differences exist: AH9247 lacks sleep mode, and AH9250 is unipolar. Direct replacement requires validation of magnetic thresholds and current budget.
What does "NRND" mean for AH9249NTR-G1?
"NRND" (Not Recommended for New Design) indicates Diodes has superseded AH9249 with newer Hall switches like AH9251 or AH9260. Existing designs may continue using AH9249NTR-G1, but new projects should evaluate successors offering improved sensitivity or lower sleep current.
Can AH9249NTR-G1 operate from a 1.8V supply?
No. AH9249NTR-G1 requires minimum 2.5V supply per datasheet specifications. Operation below 2.5V risks undefined output behavior, failure to latch, or increased susceptibility to noise due to insufficient internal bias headroom.
Does AH9249NTR-G1 require an external pull-up resistor?
No. AH9249NTR-G1 integrates a pull-up resistor to VCC on the OUTPUT pin. Adding an external pull-up creates parallel resistance, weakening drive strength and potentially increasing power consumption without benefit.
AH9249NTR-G1 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:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±5.5mT Trip, ±0.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 2mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH9249NTR-G1 FAQ
1.How can I place an order for AH9249NTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH9249NTR-G1 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 AH9249NTR-G1 reliable?
The price and inventory of AH9249NTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9249NTR-G1 is usually 5 days.
3.What payment methods are accepted for AH9249NTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9249NTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH9249NTR-G1?
AH9249NTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH9249NTR-G1 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 AH9249NTR-G1?
For technical support, including AH9249NTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9249NTR-G1 requirements.
6.How does Aetrix verify that AH9249NTR-G1 is sourced from the original manufacturer or authorized distributors?
All AH9249NTR-G1 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 AH9249NTR-G1 meets industry standards.
7.What is the process for return or replacement of AH9249NTR-G1?
All AH9249NTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AH9249NTR-G1, 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 AH9249NTR-G1 part is unused and in its original packaging.
Return procedure for AH9249NTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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