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Diodes Incorporated AH1391-FS4-7
- Part No.:
- AH1391-FS4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AH1391-FS4-7.pdf
- Description:
- HALL UNIPOLAR SWITCH X2-DFN1010-
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
AH1391-FS4-7 from Diodes Incorporated is a high-sensitivity, ultra-low-power digital dual-output unipolar Hall effect switch IC in X2-DFN1010-4 (Type B) package. It integrates two monolithic Hall switches for independent North-pole (Output1) and South-pole (Output2) detection, operates from 1.6V to 5.5V, draws only 1.1μA average supply current at 1.85V, and features ±25G typical operate points with 5G typical hysteresis - enabling reliable position sensing in battery-powered smart covers and industrial proximity switches.
For engineers reviewing the AH1391-FS4-7 datasheet, AH1391-FS4-7 pinout, AH1391-FS4-7 application, or AH1391-FS4-7 equivalent, key selection criteria include dual-pole magnetic sensitivity, micropower sleep mode timing (45μs awake time, 45ms period), chopper-stabilized offset cancellation, 6kV HBM ESD rating on all pins, and compatibility with low-voltage microcontrollers down to 1.6V.
Technical Context
The AH1391-FS4-7 implements two independent unipolar Hall switches with separate output drivers: Output1 activates (low) when perpendicular magnetic flux density falls below −25G (BOPN), releasing above −20G (BRPN); Output2 activates (low) above +25G (BOPS), releasing below +20G (BRPS). Both outputs feature internal pull-up capability and operate with chopper-stabilized amplification for drift suppression.
Sleep/awake logic cycles the device at ~22Hz (45ms period), achieving 1.1μA average current by powering the Hall plate and amplifier only during active sampling windows. The functional block includes dedicated offset cancellation, latch-and-driver stages per output, and GND-referenced exposed thermal pad - optimized for PCB space-constrained portable and industrial enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 5.5V - supports direct interface with 1.8V/3.3V/5V microcontrollers without level-shifting. |
| Average Supply Current | 1.1μA at 1.85V - enables multi-year operation on coin-cell batteries in lid-detect or smart-cover applications. |
| N-Pole Operate Point (BOPN) | −25G typical - detects weak North-pole fields from small magnets placed >1.5mm from marking surface. |
| S-Pole Operate Point (BOPS) | +25G typical - enables bidirectional sensing using single magnet orientation flip. |
| Hysteresis (BHY) | 5G typical - prevents chatter near threshold in noisy mechanical environments like appliance doors. |
| ESD Rating (HBM) | 6kV on VDD and both outputs - eliminates need for external TVS diodes in consumer-grade assemblies. |
| Operating Temperature | −40°C to +85°C - validated for use in home appliances and industrial control panels without derating. |
Pinout & Package
Package: X2-DFN1010-4 (Type B), 1.0mm × 1.0mm × 0.39mm body, 0.65mm pitch, exposed thermal pad (internally unconnected; recommended tied to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Power supply input | Accepts 1.6–5.5V; requires 100nF decoupling capacitor placed adjacent to pin for noise immunity. |
| 2 (GND) | Ground reference | Common return for Hall plate, logic, and outputs; connects to exposed thermal pad for thermal relief. |
| 3 (Output2) | South-pole output driver | Open-drain, active-low output; sinks up to 2.5mA; internally pulled up to VDD. |
| 4 (Output1) | North-pole output driver | Open-drain, active-low output; sinks up to 2.5mA; internally pulled up to VDD. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent unipolar Hall switches | Enables single-device detection of magnet polarity flip - e.g., open/closed state via one magnet repositioned over sensor face. |
| Chopper-stabilized architecture | Reduces offset drift to <±0.5G over temperature - maintains consistent operate/release points across −40°C to +85°C. |
| Micropower sleep cycling | 45ms sampling period with 45μs awake window - balances responsiveness and battery life better than continuous-mode Hall sensors. |
| Integrated pull-up on both outputs | Eliminates four external resistors in standard open-drain interface - reduces BOM count and PCB area in space-constrained designs. |
| 6kV HBM ESD protection | Protects against handling and assembly ESD events without external clamping - simplifies qualification for IEC 61000-4-2 Level 3. |
Applications
| Smart Cover Detection | Industrial Door Position Sensing |
|---|---|
|
Use Scenario: Detect open/closed state of tablet or laptop smart cover using a single embedded magnet. IC Role / Device Role / Timing Role: Dual-output Hall switch providing independent N-pole and S-pole detection to distinguish cover orientation without mechanical switches. Use Value: Eliminates sliding contacts and wear-out failure modes; 1.1μA average current extends cover-battery life beyond 5 years. |
Use Scenario: Monitor safety interlock status of access doors on industrial control cabinets or HVAC units. IC Role / Device Role / Timing Role: Magnetic proximity sensor verifying door closure before enabling high-voltage subsystems. Use Value: 6kV ESD rating ensures robustness in factory ESD-prone environments; −40°C to +85°C range supports outdoor-rated enclosures. |
| Digital Camera Lens Cap Detection | Home Appliance Tray Position Switch |
|
Use Scenario: Auto-disable image sensor and backlight when lens cap is mounted on DSLR or mirrorless camera. IC Role / Device Role / Timing Role: Low-power Hall switch triggering system sleep mode upon cap attachment/detachment. Use Value: 1.6V minimum supply allows direct connection to 1.8V camera SoC rails; 5G hysteresis prevents false triggers from vibration. |
Use Scenario: Confirm proper insertion of dishwasher detergent drawer or microwave turntable tray before cycle start. IC Role / Device Role / Timing Role: Bidirectional magnetic switch detecting tray presence and alignment via magnet polarity reversal. Use Value: Dual-output architecture replaces two discrete Hall sensors - cuts PCB area by 40% and reduces assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output unipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis US5781LUA-ABA-000-RE | Single-output, higher sensitivity (±15G), no sleep mode - 3.5μA typical IDD. | Lacks independent S/N pole outputs; requires two devices for same functionality. | Choose when only one polarity detection is needed and lower BOP is critical. |
| Allegro A1120ELHLT-T | Single-output, bipolar latching, 3.5–24V supply, 4mA IDD - no micropower mode. | Requires external pull-ups; not suitable for sub-2V systems or battery longevity. | Choose for high-voltage industrial systems where latch behavior and wide VDD range outweigh power concerns. |
Compared with US5781LUA-ABA-000-RE and A1120ELHLT-T, the AH1391-FS4-7 uniquely delivers dual independent unipolar outputs with micropower sleep mode in a 1.0mm² footprint - making it the only option for compact, long-life, bidirectional magnetic sensing at 1.6V.
Availability
AH1391-FS4-7 is available at Aetrix Electronics and suitable for smart cover detection, industrial door interlocks, camera lens cap sensing, and home appliance tray position monitoring requiring stable component supply, full RoHS/Green compliance, and traceable sourcing.
Supply support for AH1391-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-reliability, energy-efficient components for consumer, industrial, and automotive markets.
The AH1391 belongs to Diodes' Hall-effect sensor product line, designed specifically for ultra-low-power, dual-pole magnetic position detection in space- and battery-constrained portable and appliance applications.
FAQ
What is the function of the exposed thermal pad on the AH1391-FS4-7?
The center exposed pad on the X2-DFN1010-4 (Type B) package has no internal electrical connection but serves as a thermal conduction path. Diodes recommends soldering it to a GND copper pour to improve heat dissipation and stabilize junction temperature during extended operation - especially in enclosed industrial housings where ambient temperature may exceed 60°C.
Can AH1391-FS4-7 drive an LED directly without a transistor?
No. Each output is rated for 2.5mA sink current with VOL = 0.25V at 1mA load. Driving even a low-current indicator LED (typically requiring ≥5mA at ≥1.8V forward voltage) would exceed the output's voltage drop and current capability. A discrete N-MOSFET or NPN transistor is required for LED or relay loads.
How does the sleep/awake timing affect response latency in real-time position detection?
The AH1391-FS4-7 samples magnetic field every 45ms (typical period), with each awake window lasting 45μs. This results in a worst-case latency of 45ms between field change and output update. For applications requiring faster response (e.g., motor commutation), this part is unsuitable; it is optimized for static or slow-moving position detection like lid closure, not dynamic motion tracking.
Is the AH1391-FS4-7 qualified for automotive applications under AEC-Q100?
No. The AH1391-FS4-7 is specified for industrial and consumer temperature ranges (−40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AH1391Q series) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation - contact Diodes sales for Q-part availability and qualification reports.
AH1391-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:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±3.9mT Trip, ±3.4mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 1.6V ~ 5.5V
- Current - Supply (Max):
- 9µA
- Current - Output (Max):
- 2.5mA
- Output Type:
- Switch
- Features:
- Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AH1391-FS4-7 FAQ
1.How can I place an order for AH1391-FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1391-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 AH1391-FS4-7 reliable?
The price and inventory of AH1391-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 AH1391-FS4-7 is usually 5 days.
3.What payment methods are accepted for AH1391-FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1391-FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1391-FS4-7?
AH1391-FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1391-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 AH1391-FS4-7?
For technical support, including AH1391-FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1391-FS4-7 requirements.
6.How does Aetrix verify that AH1391-FS4-7 is sourced from the original manufacturer or authorized distributors?
All AH1391-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 AH1391-FS4-7 meets industry standards.
7.What is the process for return or replacement of AH1391-FS4-7?
All AH1391-FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1391-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 AH1391-FS4-7 part is unused and in its original packaging.
Return procedure for AH1391-FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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