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Diodes Incorporated AH1803-SNG-7
- Part No.:
- AH1803-SNG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AH1803-SNG-7.pdf
- Description:
- MAG SWITCH OMNIPOLAR DFN2020-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AH1803-SNG-7 from Diodes Incorporated is an ultra-sensitive, micropower Hall effect switch with dual Hall plates and CMOS output driver, designed for battery-powered portable electronics. It operates from 2.4–5.5 V, consumes only 8–27 µA average supply current at 3 V, features ±3 mT operate point (Bop), 1 mT hysteresis (Bhy), and functions across –40°C to +85°C - enabling reliable magnetic detection in flip covers and proximity sensing for smartphones.
For engineers reviewing the AH1803-SNG-7 datasheet, AH1803-SNG-7 pinout, AH1803-SNG-7 application, or AH1803-SNG-7 equivalent, key selection criteria include ultra-low power consumption (<30 µA avg), bipolar magnetic sensitivity (north/south pole activation), SC59/DFN2020-6 package compatibility, chopper-stabilized offset cancellation, and RF noise immunity in space-constrained handheld designs.
Technical Context
The AH1803-SNG-7 implements a chopper-stabilized architecture with two independent Hall plates and offset-cancelling amplifiers to suppress thermal drift and mechanical stress effects. Its logical latch ensures stable output state retention until magnetic flux drops below the release point (Brp), delivering clean digital switching without external debouncing.
It uses internal power-switching and sampling control with a 75–150 µs awake time and 75–150 ms period, ensuring predictable timing behavior during wake-up and low-power operation. The device's bipolar magnetic response (±2–4 mT Bop) and 0.5–1 mT hysteresis enable robust operation under varying temperature and mechanical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4–5.5 V - supports single-cell Li-ion and alkaline battery systems without regulation |
| Avg. Supply Current | 8–27 µA @ 2.4–5.5 V - enables multi-year operation in coin-cell–powered devices |
| Operate Point (Bop) | ±2 to ±4 mT - detects weak magnetic fields from small magnets in compact enclosures |
| Hysteresis (Bhy) | 0.5–1 mT - prevents output oscillation near switching threshold under field noise |
| Output Type | CMOS push-pull - drives logic inputs directly without pull-up resistor |
| Operating Temp. | –40°C to +85°C - qualified for consumer handheld and industrial edge-sensing environments |
| ESD (HBM) | >4 kV (DFN2020-6) - withstands handling and assembly ESD events |
Pinout & Package
AH1803-SNG-7 is packaged in the DFN2020-6 (2.0 × 2.0 mm, 0.65 mm pitch) lead-free, halogen-free "Green" package. Pin 1 = Vdd, Pin 2 = NC (recommended tied to GND), Pin 3 = Output, Pin 4 = NC, Pin 5 = GND, Pin 6 = NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vdd) | Power supply input | Accepts 2.4–5.5 V; decoupling capacitor (10–100 nF) required at this node for noise immunity |
| 2 (NC) | No connection | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction |
| 3 (Output) | Digital output | CMOS push-pull - sinks 1 mA / sources –1 mA; active-low when magnet present |
| 4 (NC) | No connection | Internally unconnected; recommended to tie to GND |
| 5 (GND) | Ground reference | Must be low-impedance return path; shares reference with Vdd and Output |
| 6 (NC) | No connection | Internally unconnected; recommended to tie to GND |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 8–27 µA average supply current enables >5-year battery life in always-on proximity detection |
| Bipolar magnetic sensitivity | Responds to either north or south pole - simplifies mechanical design and magnet orientation |
| Chopper stabilization | Eliminates offset drift over temperature and time - maintains consistent Bop/Brp across –40°C to +85°C |
| RF noise immunity | Immune to common cellular and Bluetooth band interference - no external filtering needed |
| Stress-insensitive design | Unaffected by PCB warpage or molding stress - ensures reliability after reflow soldering |
Applications
| Smartphone Flip Cover Detection | Wireless Headset Lid Sensing |
|---|---|
Use Scenario: Detects open/closed state of clamshell or folio-style smartphone covers using embedded magnet. IC Role / Device Role / Timing Role: Hall switch providing TTL-compatible on/off signal to baseband processor GPIO. Use Value: Enables automatic screen on/off with <27 µA quiescent current - extends standby battery life by months. | Use Scenario: Monitors charging case lid position in true wireless stereo (TWS) earbud systems. IC Role / Device Role / Timing Role: Proximity sensor triggering charge management and Bluetooth pairing state transitions. Use Value: Bipolar operation allows flexible magnet placement; chopper stabilization ensures consistent trip points after thermal cycling. |
| Cordless Phone Base Station Presence | PDA Docking Status Monitoring |
Use Scenario: Confirms handset placement in cradle via magnetic coupling between dock and handset. IC Role / Device Role / Timing Role: Low-power wake-up trigger for charging and sync circuitry upon insertion. Use Value: 75–150 µs awake time ensures rapid response; 0.5–1 mT hysteresis prevents false triggers from vibration. | Use Scenario: Detects PDA insertion into expansion dock or sync cradle. IC Role / Device Role / Timing Role: Digital presence indicator interfaced to microcontroller I/O with internal pull-up. Use Value: DFN2020-6 footprint saves board area in space-limited PDAs; green RoHS-compliant package meets export requirements. |
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 A3212LLHLT-T | Higher Bop (±5 mT); 3.3–5.5 V only; SOT23-3 package | Requires stronger magnet; not suitable for 2.4 V coin-cell operation | Select if higher magnetic immunity is needed and supply ≥3.3 V |
| MELEXIS US1881EUA-ABA-000-REEL | Unipolar (south-only); 3–24 V range; TO-92 package | Larger footprint; incompatible with DFN2020-6 layout; requires different magnet polarity | Select for high-voltage industrial use where bipolar operation is unnecessary |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, AH1803-SNG-7 uniquely supports 2.4 V operation, bipolar detection, and ultra-low µA-level current draw in a 2.0×2.0 mm DFN - making it optimal for miniaturized, long-life battery devices where magnet strength and voltage headroom are constrained.
Availability
AH1803-SNG-7 is available at Aetrix Electronics and suitable for smartphone flip cover detection, TWS earbud lid sensing, and cordless phone cradle presence monitoring requiring stable component supply and long-term lifecycle support.
Supply support for AH1803-SNG-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 consumer, industrial, and computing markets.
AH1803 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power magnetic switching in portable battery-operated equipment - emphasizing micropower operation, bipolar sensitivity, and robustness in thermally variable environments.
FAQ
What is the magnetic polarity requirement for AH1803-SNG-7?
AH1803-SNG-7 responds to both north and south magnetic poles applied to the branded side of the package. Its bipolar operation eliminates magnet orientation constraints during mechanical integration - a key advantage over unipolar Hall switches that require strict pole alignment.
Does AH1803-SNG-7 require an external pull-up resistor?
No. AH1803-SNG-7 features a CMOS push-pull output stage capable of actively driving high or low without external components. The output delivers VOH ≥ Vdd−0.2 V and VOL ≤ 0.1 V at rated load, enabling direct interface to standard logic inputs.
Is AH1803-SNG-7 suitable for automotive applications?
AH1803-SNG-7 is specified for –40°C to +85°C operation and meets AEC-Q200 stress test recommendations for passive components, but it is not AEC-Q100 qualified. It is intended for consumer and industrial portable electronics, not safety-critical automotive subsystems.
Why does the datasheet mark AH1803-SNG-7 as "NRND"?
"NRND" (Not Recommended for New Design) indicates Diodes Incorporated has introduced newer-generation Hall switches (e.g., AH1806) with enhanced features. However, AH1803-SNG-7 remains fully manufactured, stocked, and supported - ideal for legacy designs, cost-sensitive projects, or where its specific Bop/Bhy profile is preferred.
AH1803-SNG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4mT Trip, ±1mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.4V ~ 5.5V
- Current - Supply (Max):
- 16µA
- Current - Output (Max):
- -
- Output Type:
- Push-Pull
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-6
AH1803-SNG-7 FAQ
1.How can I place an order for AH1803-SNG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1803-SNG-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 AH1803-SNG-7 reliable?
The price and inventory of AH1803-SNG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1803-SNG-7 is usually 5 days.
3.What payment methods are accepted for AH1803-SNG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1803-SNG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1803-SNG-7?
AH1803-SNG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1803-SNG-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 AH1803-SNG-7?
For technical support, including AH1803-SNG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1803-SNG-7 requirements.
6.How does Aetrix verify that AH1803-SNG-7 is sourced from the original manufacturer or authorized distributors?
All AH1803-SNG-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 AH1803-SNG-7 meets industry standards.
7.What is the process for return or replacement of AH1803-SNG-7?
All AH1803-SNG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1803-SNG-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 AH1803-SNG-7 part is unused and in its original packaging.
Return procedure for AH1803-SNG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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