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Diodes Incorporated AH1899A-FS4-7
- Part No.:
- AH1899A-FS4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AH1899A-FS4-7.pdf
- Description:
- HALL OMNIPOLAR SWITCH X2-DFN1010
- Quantity:
- Payment:
- Shipping:
Inventory:4,885
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Product details
Overview
AH1899A-FS4-7 from Diodes Incorporated is an ultra-low-voltage, high-sensitivity micropower omnipolar Hall-effect switch IC in X2-DFN1010-4 (Type B) package, operating from 1.1V to 2.0V supply, consuming only 0.95µA avg at 1.2V, with BOP of ±6–30 Gauss and BRP of ±2–24 Gauss, used for cover/open detection in cellular phones and portable PCs.
For engineers reviewing the AH1899A-FS4-7 datasheet, AH1899A-FS4-7 pinout, AH1899A-FS4-7 application, or AH1899A-FS4-7 equivalent, key selection factors include micropower sleep current (0.29–0.7µA), hibernating clock architecture, omnipolar magnetic response, internal pullup/pulldown capability, and operation down to 1.1V for battery-constrained designs.
Technical Context
The AH1899A employs chopper-stabilized Hall sensing with offset cancellation and a sleep/awake logic controller that cycles at ~22 Hz (tperiod = 45–90 ms), reducing average current while maintaining reliable magnetic detection. Its hibernating clock system enables ultra-low IDD(avg) without sacrificing BOP/BRP repeatability.
It delivers true omnipolar switching-activating on either North or South pole exposure-with hysteresis (BHY = 6 Gauss typ) ensuring noise-immune state retention. The output is open-drain, internally pulled low when active (VOL ≤ 0.2 V @ 0.5 mA), and floats high when inactive (VOH ≥ VDD − 0.2 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1 V to 2.0 V - supports single-cell Li-ion/Li-poly and coin-cell systems without regulation |
| Avg Supply Current | 0.95 µA @ 1.2 V - enables multi-year battery life in always-on cover-detect applications |
| Operate Point (BOP) | ±6 to ±30 Gauss - detects weak magnetic fields from small magnets in thin bezels |
| Release Point (BRP) | ±2 to ±24 Gauss - provides 6 Gauss typical hysteresis for bounce-free switching |
| Output Type | Open-drain with internal pulldown - eliminates need for external resistor, saves PCB area |
| Awake Time | 45–90 µs - ensures fast response after wake event without compromising sleep efficiency |
| Operating Temp | −40°C to +85°C - qualified for consumer portable and industrial edge devices |
Pinout & Package
Package: X2-DFN1010-4 (Type B), 1.0 mm × 1.0 mm × 0.39 mm, lead-free, halogen-free, RoHS-compliant surface-mount package with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 1.1–2.0 V; internal LDO not present - requires stable low-noise source or 10–100 nF bypass capacitor |
| 2 - GND | Ground reference | Return path for Hall sensor, logic, and output driver; must be low-impedance for noise immunity |
| 3 - NC | No connection | Internally unconnected; may be left floating or tied to GND for mechanical stability |
| 4 - OUTPUT | Open-drain output | Pulled low when magnetic field exceeds BOP; floats high otherwise - compatible with 1.2–2.0 V host logic |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic activation | Detects either North or South pole - simplifies magnet placement and orientation in clamshell designs |
| Chopper-stabilized Hall plate | Reduces temperature drift of BOP/BRP to < ±0.5 Gauss/°C - maintains consistent switching across −40°C to +85°C |
| Hibernating clock architecture | Enables 0.29–0.7 µA sleep current - extends battery life beyond 5 years in typical cover-switch usage |
| Integrated pulldown resistor | Eliminates external pullup/pulldown components - reduces BOM count and PCB footprint by >0.5 mm² |
| RF noise immunity | Validated against common cellular band interference - prevents false triggers during GSM/UMTS/LTE transmission |
Applications
| Cover/Open Detection | Holster Detection |
|---|---|
Use Scenario: Detecting flip cover closure on smartphones or clamshell laptop lids. IC Role / Device Role / Timing Role: Hall-effect switch providing digital open/closed status to baseband processor via GPIO. Use Value: Enables automatic screen on/off with <1.0 µA avg current draw - preserves battery during standby. | Use Scenario: Sensing insertion/removal of a smartphone into a magnetic holster or dock. IC Role / Device Role / Timing Role: Magnetic presence detector triggering wake/sleep transitions in power management unit. Use Value: Eliminates mechanical switches prone to wear; operates reliably after >100k actuations. |
| Display Switch | Contactless UI Toggle |
Use Scenario: Activating/disabling display backlight in portable PCs or tablets when lid is closed. IC Role / Device Role / Timing Role: Low-power proximity sensor interfacing directly with EC (Embedded Controller) interrupt line. Use Value: Supports 1.1 V operation - compatible with ultra-low-voltage EC domains without level-shifting. | Use Scenario: Enabling silent, wear-free UI toggles in handheld gaming consoles or digital cameras. IC Role / Device Role / Timing Role: Omnipolar switch driving microcontroller input with hysteresis-filtered edge detection. Use Value: 6 Gauss hysteresis prevents chatter from vibration or weak stray fields near speakers/motors. |
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 |
|---|---|---|---|
| AL33100A-30DQ4 | Higher supply range (1.65–5.5 V); 1.8 µA avg current at 1.8 V; BOP = ±10 Gauss min | Requires ≥1.65 V - unsuitable for sub-1.6 V coin-cell or deep-discharge Li-ion systems | Select if system voltage ≥1.65 V and higher magnetic sensitivity margin is needed |
| TLE4913 | Automotive-grade AEC-Q100 qualified; 3.3–5.5 V operation; 3.5 mA supply current | Not micropower - incompatible with battery-life-critical portable applications | Select only for automotive interior sensing where qualification and higher voltage are mandatory |
Compared with AL33100A-30DQ4 and TLE4913, the AH1899A-FS4-7 uniquely enables sub-1.2 V operation and sub-1 µA average current - making it the only viable choice for multi-year battery life in compact, low-voltage portable devices.
Availability
AH1899A-FS4-7 is available at Aetrix Electronics and suitable for cover detection, holster sensing, and display switch applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AH1899A-FS4-7 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-efficiency power management, signal integrity, and sensing solutions for consumer, industrial, and computing markets.
The AH1899A belongs to Diodes' micropower Hall-effect switch product line, designed specifically for ultra-low-energy magnetic sensing in space-constrained, battery-powered portable electronics.
FAQ
What is the minimum operating voltage for AH1899A-FS4-7?
The AH1899A-FS4-7 operates down to 1.1 V per its Recommended Operating Conditions. Below this, magnetic response becomes unreliable and output behavior is undefined. It is validated for stable switching at 1.1 V with BOP/BRP within spec, enabling direct use with partially discharged lithium coin cells or single-cell Li-ion batteries.
Does AH1899A-FS4-7 require an external pull-up resistor?
No. The AH1899A-FS4-7 integrates internal pulldown circuitry and does not require an external pull-up resistor. Its open-drain output pulls low when active and floats high when inactive, allowing direct interface with 1.2–2.0 V logic inputs without additional components.
How does the hibernating clock affect response time?
The hibernating clock wakes the device every 45–90 ms (tperiod), with each awake period lasting 45–90 µs (tawake). Magnetic events occurring between wake cycles are not detected until the next sample window - resulting in maximum latency of one full period (~90 ms), which is acceptable for cover/holster detection but not for high-speed rotation sensing.
Is AH1899A-FS4-7 suitable for automotive applications?
No. The AH1899A-FS4-7 is specified for −40°C to +85°C operation and is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives (e.g., AH189x-Q series) with PPAP support, IATF 16949 manufacturing, and extended temperature validation - required for under-hood or cabin-mounted automotive sensors.
AH1899A-FS4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±3mT Trip, ±2.4mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 1.1V ~ 2V
- Current - Supply (Max):
- 2.2µA
- Current - Output (Max):
- 3mA
- Output Type:
- Analog Voltage
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AH1899A-FS4-7 FAQ
1.How can I place an order for AH1899A-FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1899A-FS4-7 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 AH1899A-FS4-7 reliable?
The price and inventory of AH1899A-FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1899A-FS4-7 is usually 5 days.
3.What payment methods are accepted for AH1899A-FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1899A-FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1899A-FS4-7?
AH1899A-FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1899A-FS4-7 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 AH1899A-FS4-7?
For technical support, including AH1899A-FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1899A-FS4-7 requirements.
6.How does Aetrix verify that AH1899A-FS4-7 is sourced from the original manufacturer or authorized distributors?
All AH1899A-FS4-7 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 AH1899A-FS4-7 meets industry standards.
7.What is the process for return or replacement of AH1899A-FS4-7?
All AH1899A-FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1899A-FS4-7, 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 AH1899A-FS4-7 part is unused and in its original packaging.
Return procedure for AH1899A-FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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