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Diodes Incorporated AH1888-FJG-7
- Part No.:
- AH1888-FJG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-UDFN
- Datasheet:
-
AH1888-FJG-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR 3DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
AH1888-FJG-7 from Diodes Incorporated is a micropower omni-polar Hall effect switch IC in U-DFN2020-3 package, designed for magnetic sensing in battery-powered portable electronics. It operates from 1.65V to 3.3V, consumes only 12.6µW at 1.8V, features active-low single output (Output 1), and switches reliably with either north or south magnetic pole exposure. Used in cellular phones and cordless handsets for contactless button detection.
For engineers reviewing the AH1888-FJG-7 datasheet, AH1888-FJG-7 pinout, AH1888-FJG-7 application, or AH1888-FJG-7 equivalent, key selection criteria include its 61–79 G operate point, -40°C to +85°C operating range, chopper-stabilized architecture for thermal stability, and dual-output variant compatibility (AH1888-FJRG-7).
Technical Context
The AH1888-FJG-7 integrates two Hall plates with chopper stabilization to cancel offset drift and enable stable switching across temperature. Its sleep/awake logic reduces average supply current to 7–12 µA while maintaining 50–100 µs wake-up latency.
It implements latched output behavior: Output 1 pulls low when B ≥ Bop (61–79 G), remains low until B ≤ Brp (35–53 G), and stays high with no field. The device uses internal pull-up on Vdd and requires no external components for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V to 3.3V - supports single-cell Li-ion and coin-cell battery systems without regulation. |
| Power Consumption | 12.6µW at 1.8V - enables multi-year operation in always-on sensor nodes. |
| Operate Point (Bop) | 61–79 Gauss - detects weak magnets at >3 mm air gap in compact enclosures. |
| Release Point (Brp) | 35–53 Gauss - provides 3–8 G hysteresis to prevent chatter near threshold. |
| Output Type | Active-low open-drain (Output 1) - interfaces directly with CMOS logic or microcontroller GPIO with internal pull-up. |
| Operating Temp | -40°C to +85°C - qualified for consumer handheld and automotive cabin ambient environments. |
| ESD Rating | HBM >5kV - withstands handling and assembly without external protection diodes. |
Pinout & Package
U-DFN2020-3 (2.0mm × 2.0mm, 0.5mm pitch, 3-pin) with wettable flank capability. Pin 1 = Vdd, Pin 2 = Output 1, Pin 3 = GND. Exposed thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Power input | Supplies internal regulator and Hall sensor chain; must be decoupled with 100nF capacitor within 2mm. |
| Output 1 | Signal output | Open-drain, active-low output; sinks up to 0.5mA; requires external pull-up for logic-high state. |
| GND | Reference ground | Return path for Hall sensor bias and output driver; connects to PCB ground plane under exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Omni-polar magnetic sensitivity | Detects both north and south poles - eliminates magnet orientation constraints during mechanical integration. |
| Chopper-stabilized architecture | Reduces switch-point drift to <±0.5 G/°C - maintains consistent actuation across -40°C to +85°C. |
| Micropower sleep mode | 5–8 µA disable current - enables ultra-low-power wake-on-magnetic-event architectures. |
| Integrated output pull-up | Eliminates need for external resistor in most microcontroller interface configurations. |
Applications
| Cellular Phone Keypad | Portable PC Lid Switch |
|---|---|
Use Scenario: Detect flip-open lid or slide cover position in smartphones and clamshell handsets. IC Role / Device Role / Timing Role: Hall switch providing digital open/closed status to baseband processor via GPIO interrupt. Use Value: Enables zero-power standby detection with 12.6µW active consumption and <100µs response latency. | Use Scenario: Sense laptop lid closure to trigger sleep/wake transition in Windows/Linux OS. IC Role / Device Role / Timing Role: Magnetic proximity detector interfacing directly with EC (Embedded Controller) GPIO. Use Value: Eliminates mechanical switch wear and supports IP54-rated sealed chassis designs. |
| Cordless Phone Base Station | Wireless Headset Charging Case |
Use Scenario: Confirm handset docked position in DECT cordless phone cradle. IC Role / Device Role / Timing Role: Latched Hall switch signaling presence/absence to charging controller IC. Use Value: Prevents false charging start due to vibration; hysteresis avoids bounce at docking edge. | Use Scenario: Detect earbud insertion into charging compartment of true wireless stereo case. IC Role / Device Role / Timing Role: Low-power magnetic presence detector enabling charge management and LED status feedback. Use Value: Extends case battery life by disabling charging circuitry when earbuds are absent. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3320EUST-7 | Unipolar, 2.5–5.5V supply, 3.5µA typical IDD, SOT-23-3 | Requires dedicated north-pole magnet; lower power but narrower voltage range | Select when unipolar operation suffices and supply exceeds 2.5V. |
| TLE4913HTSA1 | Bipolar, 3–24V supply, 3.5mA IDD, PG-SSO-3 | Higher voltage/current; automotive-qualified; no micropower mode | Choose for 12V industrial or automotive systems where power budget is less constrained. |
Compared with AL3320EUST-7 and TLE4913HTSA1, the AH1888-FJG-7 uniquely balances omni-polarity, sub-15µW operation, and 1.65V minimum supply-making it optimal for space-constrained, coin-cell–powered consumer devices requiring field-agnostic actuation.
Availability
AH1888-FJG-7 is available at Aetrix Electronics and suitable for cellular phone keypad sensing, portable PC lid detection, and cordless phone docking applications requiring stable component supply and RoHS-compliant green packaging.
Supply support for AH1888-FJG-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AH1888 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, high-reliability magnetic position and proximity detection in portable consumer electronics.
FAQ
What is the magnetic polarity requirement for AH1888-FJG-7 operation?
The AH1888-FJG-7 is omni-polar: it activates with either a north or south magnetic pole presented to the branded side of the package. No magnet orientation alignment is needed during mechanical integration, simplifying assembly and reducing field calibration steps in high-volume consumer device manufacturing.
Does AH1888-FJG-7 require an external pull-up resistor?
Yes - Output 1 is an open-drain, active-low terminal and requires an external pull-up resistor (typically 10kΩ to Vdd) to establish a defined logic-high state when inactive. The internal pull-up capability referenced in the datasheet applies only to internal bias networks, not the output driver stage.
Can AH1888-FJG-7 replace AH1888-ZG-7 in existing SOT553 designs?
No - AH1888-FJG-7 uses U-DFN2020-3 (2.0×2.0mm) while AH1888-ZG-7 uses SOT553 (1.7×1.2mm). Footprint, solder stencil, and thermal pad layout differ significantly. Migration requires PCB redesign and requalification per JEDEC J-STD-020 moisture sensitivity level MSL3.
What is the maximum recommended air gap between magnet and AH1888-FJG-7?
At 1.8V supply and 25°C, the device reliably switches with a neodymium N35 magnet (Br ≈ 1.17T) at up to 3.2mm air gap. Gap tolerance decreases with lower supply voltage or higher temperature; full characterization requires magnet strength verification per DS31565 Figure 7 and application-specific flux modeling.
AH1888-FJG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±7.9mT Trip, ±3.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 1.65V ~ 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:
- DFN2020-3
AH1888-FJG-7 FAQ
1.How can I place an order for AH1888-FJG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1888-FJG-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 AH1888-FJG-7 reliable?
The price and inventory of AH1888-FJG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1888-FJG-7 is usually 5 days.
3.What payment methods are accepted for AH1888-FJG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1888-FJG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1888-FJG-7?
AH1888-FJG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1888-FJG-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 AH1888-FJG-7?
For technical support, including AH1888-FJG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1888-FJG-7 requirements.
6.How does Aetrix verify that AH1888-FJG-7 is sourced from the original manufacturer or authorized distributors?
All AH1888-FJG-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 AH1888-FJG-7 meets industry standards.
7.What is the process for return or replacement of AH1888-FJG-7?
All AH1888-FJG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1888-FJG-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 AH1888-FJG-7 part is unused and in its original packaging.
Return procedure for AH1888-FJG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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