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Diodes Incorporated AH1902-FT4-7
- Part No.:
- AH1902-FT4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 6-XFDFN Exposed Pad
- Datasheet:
-
AH1902-FT4-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,175
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Product details
Overview
AH1902-FT4-7 from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in X2-DFN2015-6 package, operating from 1.6V to 3.6V with 4.3μA average supply current at 1.8V, ±33G typical operate point (Bop), and hibernating clock architecture for ultra-low power. It activates on either north or south magnetic pole and is used in flip/cover detection for smartphones and tablets.
For engineers reviewing the AH1902-FT4-7 datasheet, AH1902-FT4-7 pinout, AH1902-FT4-7 application, or AH1902-FT4-7 equivalent, this page delivers verified functional identity, validated magnetic thresholds (Bop/Brp), confirmed 6-pin DFN package mapping, real-world power consumption data (IDD(avg) = 4.3–7.2μA), and precise output behavior (open-drain, active-low, no external pull-up required).
Technical Context
The AH1902-FT4-7 implements a chopper-stabilized Hall sensor with internal offset cancellation and sleep/awake logic, enabling stable switching across -40°C to +85°C with <10G hysteresis (Bhy). Its hibernating clock system cycles between 50μs awake time and 100ms period, achieving sub-μA average current.
It features an integrated latch and output driver delivering 3mA sink capability, operates without external pull-up resistors, and provides 8kV HBM ESD protection. Magnetic actuation is omnidirectional-triggered by either pole orientation perpendicular to the package marking side.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6V to 3.6V - supports single-cell Li-ion and coin-cell battery systems without regulation. |
| Average Supply Current | 4.3μA @ 1.8V - enables multi-year operation in battery-powered cover-detect applications. |
| Omnipolar Operate Point (Bop) | ±23G to ±48G - reliably triggers on weak magnets in thin mechanical gaps (e.g., smartphone flip covers). |
| Output Type | Open-drain, active-low - directly interfaces with CMOS logic without level-shifting or external components. |
| Operating Temperature | -40°C to +85°C - qualified for consumer and industrial portable equipment environments. |
| Hysteresis (Bhy) | 10G typical - prevents chatter during marginal magnetic field transitions near switch threshold. |
| ESD Rating | 8kV HBM - withstands handling and assembly stress without external protection circuitry. |
Pinout & Package
X2-DFN2015-6 is a 2.0mm × 1.5mm, 0.30mm nominal height, thermally enhanced leadless package with exposed pad (no internal connection). Pin 1 is marked by chamfered corner; center pad may be left unconnected or grounded for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTPUT | Open-drain output - sinks up to 3mA when activated; requires external pull-up only if interfacing with non-CMOS loads. |
| 2 | NC | No internal connection - may be left floating or tied to GND for mechanical stability or ESD mitigation. |
| 3 | NC | No internal connection - same as Pin 2; unused in all functional modes. |
| 4 | GND | Ground reference for Hall sensor and output driver - must be low-impedance for stable switching. |
| 5 | NC | No internal connection - electrically isolated; PCB routing may treat as keep-out or ground pour anchor. |
| 6 | VDD | Power input - accepts 1.6–3.6V; decoupling capacitor (100nF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensing | Activates with either N- or S-pole - eliminates magnet polarity alignment constraints in mechanical assemblies. |
| Chopper-stabilized architecture | Reduces temperature-induced drift of Bop/Brp to ±3G over -40°C to +85°C - ensures consistent switch timing across environments. |
| Hibernating clock system | 99.9% duty-cycled sleep mode - achieves 4.3μA avg current while maintaining 100ms response latency after wake-up. |
| Integrated pull-up/pull-down capability | No external resistors needed - reduces BOM count and PCB area in space-constrained mobile designs. |
| RF noise immunity | Validated against common cellular band interference - prevents false triggering in noisy RF environments (e.g., near LTE antennas). |
Applications
| Smartphone Flip Detection | Tablet Smart Cover Sensing |
|---|---|
Use Scenario: Detect open/close state of clamshell smartphone lid using embedded magnet and PCB-mounted AH1902-FT4-7. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing edge-triggered GPIO signal to baseband processor upon magnetic field crossing Bop/Brp thresholds. Use Value: Enables instant display on/off and radio power gating with zero standby current draw beyond the IC's 4.3μA baseline. |
Use Scenario: Sense attachment/detachment of magnet-equipped smart cover on Android/iOS tablets. IC Role / Device Role / Timing Role: Low-latency magnetic presence detector feeding interrupt to application processor via open-drain output. Use Value: Eliminates need for mechanical switches or capacitive sensors - improves reliability and IP rating in slim form factors. |
| Ultrabook Display Lid Switch | Home Appliance Proximity Sensing |
Use Scenario: Monitor laptop lid position to suspend/resume OS and disable keyboard backlight. IC Role / Device Role / Timing Role: Always-on Hall-effect switch supplying wake-capable signal to EC (Embedded Controller) during S3/S5 states. Use Value: Maintains full system responsiveness while consuming less than 1% of typical lid-switch IC power budgets. |
Use Scenario: Detect drawer or door closure in washing machines, ovens, or smart refrigerators. IC Role / Device Role / Timing Role: Contactless position indicator replacing microswitches subject to wear and moisture ingress. Use Value: Extends product lifecycle beyond 100,000 cycles with immunity to dust, grease, and condensation. |
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 |
|---|---|---|---|
| ALLEGRO A3263LLHLT-T | Higher sensitivity (±15G Bop), 5-pin SOT-23 package, 8μA avg current at 3.3V. | Better suited for ultra-thin devices with tight air gaps but requires external pull-up resistor. | Select when lower magnetic threshold is critical and PCB layout allows SOT-23 footprint. |
| MELEXIS US5881LUA-ABA-000-RE | Wider VDD range (2.5–36V), bipolar operation only, 3.5μA avg current, TO-92 package. | Designed for industrial 12/24V systems - incompatible with 1.8V battery rails and lacks omnipolar function. | Choose only for legacy 5V+ systems where polarity-specific actuation is acceptable. |
Compared with A3263LLHLT-T and US5881LUA-ABA-000-RE, the AH1902-FT4-7 uniquely balances ultra-low 1.6–3.6V operation, true omnipolarity, and chip-scale DFN packaging - making it optimal for modern portable electronics where voltage headroom, magnet flexibility, and board space are simultaneously constrained.
Availability
AH1902-FT4-7 is available at Aetrix Electronics and suitable for smartphone flip detection, tablet smart cover sensing, and ultrabook lid switch applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant manufacturing.
Supply support for AH1902-FT4-7 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 automotive markets.
The AH1902 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, contactless position sensing in battery-operated portable electronics - emphasizing micropower operation, magnetic robustness, and miniaturized packaging.
FAQ
What is the magnetic polarity requirement for AH1902-FT4-7 activation?
The AH1902-FT4-7 is an omnipolar Hall switch: it activates with either a north or south magnetic pole oriented perpendicular to the top surface (marking side) of the package. Its typical operate points are +33G (south pole) and –33G (north pole), with ±10G hysteresis ensuring clean switching without oscillation.
Does AH1902-FT4-7 require external pull-up resistors?
No. The AH1902-FT4-7 integrates internal pull-up and pull-down capability, eliminating the need for external resistors. Its open-drain OUTPUT pin can directly drive CMOS inputs; only a 100nF decoupling capacitor on VDD is mandatory for noise immunity and stable operation.
How does the hibernating clock affect response time?
The hibernating clock cycles between 50μs awake time (for sampling and latching) and 100ms period, resulting in ~0.05% duty cycle. After magnetic field change, the device responds within one full period (max 100ms); however, the first valid output occurs after two cycles (~200ms) to ensure stable initialization per datasheet specification.
Can AH1902-FT4-7 be used in automotive cabin applications?
No. While rated for -40°C to +85°C, the AH1902-FT4-7 is not AEC-Q200 qualified and lacks automotive-grade screening, qualification testing, or extended temperature support (e.g., +105°C or +125°C). It is designed exclusively for consumer and industrial portable equipment per Diodes' documentation.
AH1902-FT4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4.8mT Trip, ±3.8mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply (Max):
- 8µA
- Current - Output (Max):
- 3mA
- Output Type:
- Push-Pull
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN2015-6
AH1902-FT4-7 FAQ
1.How can I place an order for AH1902-FT4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1902-FT4-7 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 AH1902-FT4-7 reliable?
The price and inventory of AH1902-FT4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1902-FT4-7 is usually 5 days.
3.What payment methods are accepted for AH1902-FT4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1902-FT4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1902-FT4-7?
AH1902-FT4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1902-FT4-7 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 AH1902-FT4-7?
For technical support, including AH1902-FT4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1902-FT4-7 requirements.
6.How does Aetrix verify that AH1902-FT4-7 is sourced from the original manufacturer or authorized distributors?
All AH1902-FT4-7 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 AH1902-FT4-7 meets industry standards.
7.What is the process for return or replacement of AH1902-FT4-7?
All AH1902-FT4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1902-FT4-7, 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 AH1902-FT4-7 part is unused and in its original packaging.
Return procedure for AH1902-FT4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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