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Diodes Incorporated AH1891-CA4-7
- Part No.:
- AH1891-CA4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-UFBGA, WLBGA
- Datasheet:
-
AH1891-CA4-7.pdf
- Description:
- MAGNETIC SWITCH OMNI UWLB0808-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
AH1891-CA4-7 from Diodes Incorporated is a miniature micropower omnipolar Hall effect switch IC with dual complementary outputs, designed for battery-powered portable electronics. It operates from 1.8V to 3.3V, draws only 7µA average supply current, and integrates internal pull-up/pull-down circuitry. Its U-WLB0808-4 CSP package (0.8mm × 0.8mm) enables ultra-compact placement in space-constrained applications like smartphone flip detection and portable PC lid sensing.
For engineers reviewing the AH1891-CA4-7 datasheet, AH1891-CA4-7 pinout, AH1891-CA4-7 application, or AH1891-CA4-7 equivalent, key selection criteria include its dual-output polarity behavior, 20–60 Gauss operate point, chopper-stabilized architecture for thermal stability, and RoHS-compliant U-WLB0808-4 packaging with verified 4-pin terminal mapping.
Technical Context
The AH1891-CA4-7 implements a chopper-stabilized Hall sensor with dual latched outputs: Output 1 is active-low, Output 2 is active-high and inverted relative to Output 1. Magnetic actuation occurs at ±20–60 Gauss (Bop) with 15 Gauss typical hysteresis, supporting reliable switching under varying temperature and supply voltage conditions.
Its internal power management includes a sleep mode enabling 7µA average current draw, while the integrated pull-up/pull-down network eliminates external resistors. The device maintains stable operation across –40°C to +85°C and exhibits >4kV HBM ESD immunity-critical for handheld device integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8V to 3.3V - supports single-cell Li-ion and Li-poly battery systems without regulation |
| Avg. Supply Current | 7µA - enables multi-year battery life in always-on sensing applications |
| Operate Point (Bop) | ±20–60 Gauss - detects weak magnetic fields from small magnets in tight mechanical gaps |
| Hysteresis (Bhy) | 15 Gauss typ. - prevents output chatter near threshold during slow field transitions |
| Output Configuration | Dual complementary (Out1 low / Out2 high on activation) - simplifies interface to MCU GPIO or logic gates |
| ESD Rating | >4kV HBM - withstands handling and assembly stress in consumer electronics manufacturing |
| Operating Temp. | –40°C to +85°C - qualified for full industrial ambient range in portable equipment |
Pinout & Package
The AH1891-CA4-7 is housed in a 0.8mm × 0.8mm U-WLB0808-4 wafer-level chip-scale package with bottom-side solder bumps and no exposed leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Out1 | Active-low output; sinks current when magnetic field exceeds Bop |
| A2 | Out2 | Active-high, inverted output; sources current when Out1 is active |
| B1 | GND | Ground reference for Hall sensor, amplifier, and output drivers |
| B2 | Vdd | Primary power input; supplies internal regulator, Hall plate, and logic |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensitivity | Detects either North or South pole - eliminates magnet orientation constraints in mechanical assembly |
| Chopper-stabilized architecture | Reduces offset drift to <±0.5mV/°C - ensures consistent Bop/Brp over temperature without calibration |
| Integrated pull-up/pull-down | Removes need for four external resistors - saves PCB area and BOM cost in dual-output configurations |
| Ultra-low quiescent current | 7µA avg. - extends battery runtime in devices requiring continuous hall sensing (e.g., clamshell open/close monitoring) |
Applications
| Smartphone Flip Detection | Digital Camera Lens Cover Sensing |
|---|---|
Use Scenario: Detects lid open/close state in foldable smartphones using embedded magnet and PCB-mounted AH1891. IC Role / Device Role / Timing Role: Hall effect switch providing deterministic, bounce-free digital state transition with <100µs wake time. Use Value: Enables instant system wake/sleep without polling; 7µA current allows 24/7 monitoring on single-cell battery. | Use Scenario: Senses lens cover position in compact digital cameras to enable/disable autofocus and image capture. IC Role / Device Role / Timing Role: Dual-output Hall switch delivering complementary signals to camera SoC GPIO pins for fail-safe status verification. Use Value: Eliminates need for external pull resistors and reduces footprint by 0.64mm² versus discrete solutions. |
| Portable PC Lid Switch | Wireless Headset Case Detection |
Use Scenario: Monitors clamshell lid position in ultraportable laptops to trigger sleep/wake and display enable/disable. IC Role / Device Role / Timing Role: Omnipolar Hall switch interfacing directly to EC (Embedded Controller) with no external components. Use Value: Guaranteed operation down to 1.8V ensures compatibility with low-voltage EC I/O domains. | Use Scenario: Detects charging case closure in true wireless stereo (TWS) earbud systems to initiate charging and power-down sequencing. IC Role / Device Role / Timing Role: Micropower Hall sensor with dual outputs used for redundant status confirmation between earbuds and case MCU. Use Value: 0.8mm × 0.8mm CSP footprint fits within tight TWS case cavity; 15G hysteresis prevents false triggers during pocket carry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar omnipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH1892-CA4-7 | Same package and pinout; higher Bop (30–70G) and lower Idd(avg) (5µA) | Better suited for applications with larger air gaps or tighter power budgets | Select when stronger magnetic fields are available or sub-7µA average current is required |
| AH1898-CA4-7 | Same footprint; bipolar (not omnipolar) operation; higher ESD (8kV HBM) | Requires magnet polarity alignment; preferred in high-noise industrial environments | Choose only if polarity control is feasible and enhanced ESD robustness is critical |
Compared with AH1892-CA4-7 and AH1898-CA4-7, the AH1891-CA4-7 offers the broadest magnetic sensitivity range (±20–60G) and true omnipolar flexibility-making it optimal for consumer portable designs where magnet placement tolerance and ease of assembly are prioritized over minimal current or polarity control.
Availability
AH1891-CA4-7 is available at Aetrix Electronics and suitable for smartphone flip detection, portable PC lid sensing, and wireless headset case monitoring requiring stable component supply and long-term design continuity.
Supply support for AH1891-CA4-7 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, computing, and industrial markets.
The AH1891 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power, space-constrained portable electronics requiring robust magnetic sensing without external passive components.
FAQ
What is the magnetic polarity requirement for AH1891-CA4-7 operation?
The AH1891-CA4-7 is an omnipolar Hall switch: it activates with either a North or South magnetic pole presented to the branded side of the package. No polarity alignment is needed during mechanical integration-simplifying assembly and reducing magnet cost in consumer devices.
Can AH1891-CA4-7 drive an LED directly?
No. AH1891-CA4-7 outputs are CMOS-compatible push-pull structures rated for ±0.5mA load current. While Output 1 can sink up to 0.5mA and Output 2 can source up to 0.5mA, driving even low-current LEDs requires external current-limiting resistors and may exceed safe operating limits under temperature variation.
Is AH1891-CA4-7 pin-compatible with AH1892-CA4-7?
Yes. AH1891-CA4-7 and AH1892-CA4-7 share identical U-WLB0808-4 packaging, pin assignment (A1=Out1, A2=Out2, B1=GND, B2=Vdd), and footprint. They are drop-in replacements except for differences in magnetic thresholds and average supply current.
What is the recommended PCB pad layout for U-WLB0808-4?
Diodes specifies a land pattern with four 0.172mm × 0.172mm solder pads spaced 0.4mm center-to-center (AP02001). Use non-solder-mask-defined (NSMD) pads with 0.05mm solder mask clearance to ensure reliable reflow and avoid bridging in this 0.8mm CSP package.
AH1891-CA4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-UFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT Trip, ±1.2mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 1.8V ~ 3.3V
- Current - Supply (Max):
- 12µA
- 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-WLB0808-4
AH1891-CA4-7 FAQ
1.How can I place an order for AH1891-CA4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1891-CA4-7 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 AH1891-CA4-7 reliable?
The price and inventory of AH1891-CA4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1891-CA4-7 is usually 5 days.
3.What payment methods are accepted for AH1891-CA4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1891-CA4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1891-CA4-7?
AH1891-CA4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1891-CA4-7 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 AH1891-CA4-7?
For technical support, including AH1891-CA4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1891-CA4-7 requirements.
6.How does Aetrix verify that AH1891-CA4-7 is sourced from the original manufacturer or authorized distributors?
All AH1891-CA4-7 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 AH1891-CA4-7 meets industry standards.
7.What is the process for return or replacement of AH1891-CA4-7?
All AH1891-CA4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1891-CA4-7, 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 AH1891-CA4-7 part is unused and in its original packaging.
Return procedure for AH1891-CA4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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