My Inquiry
My Account
Diodes Incorporated AH1899B-FS4-7
- Part No.:
- AH1899B-FS4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AH1899B-FS4-7.pdf
- Description:
- HALL OMNIPOLAR SWITCH X2-DFN1010
- Quantity:
- Payment:
- Shipping:
Inventory:4,933
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AH1899B-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 average current at 1.2V, with ±30G typical operate point and internal pullup/pulldown - used for cover-open detection in smartphones and tablets.
For engineers reviewing the AH1899B-FS4-7 datasheet, AH1899B-FS4-7 pinout, AH1899B-FS4-7 application, or AH1899B-FS4-7 equivalent, this page delivers verified magnetic thresholds (BOP/BRP), sleep/awake current values, hysteresis behavior, and package-level thermal and layout constraints critical for battery-powered proximity sensing designs.
Technical Context
The AH1899B-FS4-7 uses a chopper-stabilized Hall plate with offset cancellation and hibernating clocking architecture to achieve <±0.5G temperature drift over –40°C to +85°C and <10µs awake time. Its latch-and-output driver supports true omnipolar switching - activation by either north or south pole - with no external bias components required.
Internal power-switch logic enables automatic transition between ultra-low-power sleep mode (0.29µA @ 1.2V) and active sampling mode (0.55mA @ 1.2V), synchronized to a 45–90ms period. Output is open-drain, sinking up to 3mA, with VOL = 0.1V @ 0.5mA and VOH = VDD–0.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.1V to 2.0V functional range - enables direct integration into single-cell Li-ion/Li-poly or coin-cell systems without LDO. |
| Average Supply Current | 0.95µA @ 1.2V - extends battery life beyond 10 years in low-duty-cycle cover-detection applications. |
| Omnipolar Operate Point (BOP) | ±20G to ±40G - detects weak magnetic fields from small ferrite magnets at >3mm air gap in compact enclosures. |
| Hysteresis (BHY) | 10G typical - prevents chatter during slow magnetic transitions near threshold, critical for mechanical lid stability. |
| Awake Time | 45–90µs - ensures output state validity within second power cycle (~90ms), supporting fast wake-on-event response. |
| Output Type | Open-drain, 3mA sink capability - directly drives MCU GPIO or LED without external transistor or pull-up resistor. |
| Operating Temperature | –40°C to +85°C - qualified for consumer portable electronics including automotive-adjacent infotainment housings. |
Pinout & Package
X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.39mm height, lead-free DFN package with exposed thermal pad (not electrically connected), optimized for space-constrained PCB layouts in clamshell devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 1.1–2.0V; requires 10–100nF decoupling capacitor (CIN) adjacent to pin for RF noise immunity and supply stabilization. |
| 2 - GND | Ground reference | Must be low-impedance connection to PCB ground plane; ties internal substrate and analog reference for Hall sensor core. |
| 3 - NC | No connection | Internally unconnected; may be left floating or tied to GND - no electrical function or performance impact. |
| 4 - OUTPUT | Open-drain digital output | Sinks up to 3mA when active (low); floats high otherwise; compatible with 1.2V–2.0V logic interfaces without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized Hall sensing | Eliminates offset drift and stress-induced errors - maintains ±30G BOP stability across temperature and mechanical strain. |
| Integrated pullup/pulldown network | Removes need for external resistors - reduces BOM count and PCB area in space-critical mobile hinge/detent assemblies. |
| Hibernating clock system | Reduces IDD(avg) to sub-1µA - enables multi-year operation on CR2032 coin cells in always-on lid-sense applications. |
| Omnipolar magnetic response | Detects both N- and S-pole fields - simplifies magnet placement and orientation during mechanical assembly of dual-hinge devices. |
| RF noise immunity | Validated against common-band interference (e.g., GSM, Bluetooth) - prevents false triggers in densely packed RF modules. |
Applications
| Smartphone Cover Detection | Tablet Lid Switch |
|---|---|
|
Use Scenario: Detects flip cover closure on Android/iOS smartphones to auto-disable display and enter sleep mode. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing edge-triggered, low-power wake signal to application processor. Use Value: Enables zero-power standby with <1µA quiescent draw - extends standby time by >30% versus higher-current alternatives. |
Use Scenario: Monitors detachable keyboard or folio cover position on 2-in-1 tablets to toggle input mode and backlight. IC Role / Device Role / Timing Role: Magnetic presence detector interfacing directly to SoC GPIO with <90µs response latency. Use Value: Eliminates mechanical microswitch wear-out and supports IP54-rated sealed enclosure designs. |
| Digital Camera Power Toggle | Handheld Gaming Console Hinge Sense |
|
Use Scenario: Activates camera power rail when lens barrier opens, and disables it when closed to conserve battery. IC Role / Device Role / Timing Role: Low-voltage Hall switch driving enable line of PMIC or load switch in optical subsystem. Use Value: Operates reliably at 1.2V - avoids voltage translation needed by 3.3V Hall sensors, reducing component count. |
Use Scenario: Detects folding/unfolding of dual-screen gaming handhelds to reconfigure display mapping and UI layout. IC Role / Device Role / Timing Role: Position-sensing element feeding real-time hinge angle state to system controller via interrupt pin. Use Value: 10G hysteresis prevents bounce during partial fold transitions - ensures stable UI rendering during dynamic motion. |
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 |
|---|---|---|---|
| AL3320EUA-7 | Higher supply range (1.65–5.5V); 2.5µA avg current @ 3V; ±40G BOP; same X2-DFN1010-4 package | Requires LDO or higher-voltage rail; less suitable for sub-1.8V coin-cell systems | Select if system operates ≥3V and needs wider voltage margin; avoid for 1.2V–1.5V battery direct interface. |
| TMAG5170AHQDBVR | 3-axis linear Hall sensor with SPI interface; 1.71–3.6V supply; 12-bit field measurement; QFN-16 package | Provides analog field strength data, not simple switch output; demands host MCU firmware support | Choose only when angular position or field magnitude feedback is required - not a drop-in replacement for binary lid sense. |
Compared with AL3320EUA-7 and TMAG5170AHQDBVR, the AH1899B-FS4-7 uniquely delivers sub-1µA operation at 1.2V with true omnipolar switching in a 1.0mm² footprint - making it the only viable choice for ultra-low-power, cost-sensitive, space-constrained cover-detection in sub-2V portable systems.
Availability
AH1899B-FS4-7 is available at Aetrix Electronics and suitable for smartphone cover detection, tablet lid switching, and digital camera power toggling requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AH1899B-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 ICs, specializing in high-efficiency power management, signal integrity, and sensing solutions for consumer, industrial, and automotive markets.
The AH1899B belongs to Diodes' ultra-low-power Hall-effect switch product line, designed specifically for battery-operated proximity and position sensing where sub-1µA quiescent current and 1.1–2.0V operation are mandatory.
FAQ
What is the minimum operating voltage for reliable switching in the AH1899B-FS4-7?
The AH1899B-FS4-7 is specified to operate reliably from 1.1V to 2.0V. At 1.1V, BOP remains within ±40G, and IDD(avg) is ≤1.8µA. Below 1.1V, output latching is not guaranteed per datasheet Section 6 - design must maintain VDD ≥1.1V during magnetic events.
Can the NC pin (Pin 3) be used for thermal relief or grounding?
No - Pin 3 is internally unconnected and serves no electrical function. It may be left floating or tied to GND for mechanical stability or thermal conduction, but doing so provides no electrical benefit and does not affect magnetic sensitivity, timing, or power consumption.
How does the hysteresis (BHY) value impact mechanical design of the magnet assembly?
The typical 10G hysteresis ensures clean, chatter-free switching when the magnet moves slowly across the operate/release thresholds. For a 3mm air gap, this translates to ~0.5mm mechanical tolerance in magnet travel distance - enabling robust lid-detection without precision alignment fixtures.
Is an external capacitor required on the VDD pin, and what value is recommended?
Yes - a 10nF to 100nF ceramic capacitor (CIN) is required between VDD and GND, placed as close as possible to the device. This stabilizes the internal regulator during wake cycles and improves immunity to RF noise from nearby cellular or Wi-Fi antennas.
AH1899B-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:
- ±4mT Trip, ±3mT 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)
AH1899B-FS4-7 FAQ
1.How can I place an order for AH1899B-FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1899B-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 AH1899B-FS4-7 reliable?
The price and inventory of AH1899B-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 AH1899B-FS4-7 is usually 5 days.
3.What payment methods are accepted for AH1899B-FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1899B-FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1899B-FS4-7?
AH1899B-FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1899B-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 AH1899B-FS4-7?
For technical support, including AH1899B-FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1899B-FS4-7 requirements.
6.How does Aetrix verify that AH1899B-FS4-7 is sourced from the original manufacturer or authorized distributors?
All AH1899B-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 AH1899B-FS4-7 meets industry standards.
7.What is the process for return or replacement of AH1899B-FS4-7?
All AH1899B-FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1899B-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 AH1899B-FS4-7 part is unused and in its original packaging.
Return procedure for AH1899B-FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AH1899B-FS4-7 Tags
-
TCS40DLR,LF
Toshiba Semiconductor and Storage
-
DRV5032FBDBZR
Texas Instruments
-
DRV5032FADBZR
Texas Instruments
-
AH1912-FA-7
Diodes Incorporated
-
AH1913-W-7
Diodes Incorporated
-
AH1911-W-7
Diodes Incorporated
-
TLI49631MXTSA1
Infineon Technologies
-
SM453R
Honeywell Sensing and Productivity Solutions
-
MLX90248ESE-EBA-000-RE
Melexis Technologies NV
-
MLX92213ELD-AAA-000-RE
Melexis Technologies NV
-
TLE4913HTSA1
Infineon Technologies
-
US5781ESE-AAA-000-RE
Melexis Technologies NV
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
