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Diodes Incorporated AH1391-HK4-7
- Part No.:
- AH1391-HK4-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 4-XFDFN Exposed Pad
- Datasheet:
-
AH1391-HK4-7.pdf
- Description:
- HALL OMNIPOLAR SWITCH X2-DFN1410
- Quantity:
- Payment:
- Shipping:
Inventory:3,715
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Product details
Overview
AH1391-HK4-7 from Diodes Incorporated is a high-sensitivity, ultra-low-power digital dual-output unipolar Hall effect switch IC in X2-DFN1410-4 package, designed for magnetic pole detection in battery-powered systems. It features independent North-pole–activated Output1 (BOPN = −25 G typical) and South-pole–activated Output2 (BOPS = +25 G typical), 1.6 V to 5.5 V supply range, 1.1 µA average current at 1.85 V, and 6 kV HBM ESD rating.
For engineers reviewing the AH1391-HK4-7 datasheet, AH1391-HK4-7 pinout, AH1391-HK4-7 application, or AH1391-HK4-7 equivalent, this device supports contactless position sensing with dual-pole discrimination, micropower sleep mode timing, and robust operation across −40°C to +85°C - critical for smart cover detection, lid switches, and industrial proximity sensing.
Technical Context
The AH1391-HK4-7 integrates two monolithic unipolar Hall switches with chopper-stabilized amplifiers and internal offset cancellation, enabling stable magnetic threshold performance over temperature and supply voltage. Its dual-output architecture allows simultaneous, independent detection of North and South magnetic poles perpendicular to the part marking surface.
Sleep/awake logic cycles the sensor at ~30 ms period (typical), achieving ultra-low average current while maintaining fast awake time (45 µs typical). Each output is open-drain with internal pull-down capability and operates with guaranteed VOL ≤ 0.25 V at 1 mA sink, VOH ≥ VDD−0.15 V at −1 mA source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6 V to 5.5 V - supports direct interface with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting. |
| Average Supply Current | 1.1 µA at 1.85 V - enables multi-year battery life in coin-cell–powered devices like smart covers. |
| Output Configuration | Two open-drain outputs with internal pull-down - simplifies PCB layout by eliminating external resistors for active-low switching. |
| Magnetic Sensitivity | BOPN = −25 G (North), BOPS = +25 G (South) - provides reliable activation with small, low-cost magnets at air gaps up to 3 mm. |
| Hysteresis | 5 G typical - prevents output chatter near switch points under fluctuating field conditions. |
| ESD Rating | 6 kV HBM on VDD and outputs - eliminates need for external TVS diodes in handheld and appliance designs. |
| Operating Temperature | −40°C to +85°C - qualified for indoor industrial and consumer environments without derating. |
Pinout & Package
Package: X2-DFN1410-4 (1.4 mm × 1.0 mm × 0.37 mm height), thermally enhanced with exposed center pad tied to GND for improved thermal dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VDD) | Power supply input | Accepts 1.6–5.5 V; requires 100 nF decoupling capacitor placed adjacent to pin for noise immunity. |
| Pin 2 (GND) | Ground reference | Common return path for supply and outputs; center thermal pad must be connected to GND plane. |
| Pin 3 (Output2) | South-pole–activated output | Open-drain output pulled low when B ≥ +25 G; compatible with 1.8 V–5.5 V logic interfaces. |
| Pin 4 (Output1) | North-pole–activated output | Open-drain output pulled low when B ≤ −25 G; electrically isolated from Output2 for independent sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent unipolar detection | Enables single-sensor implementation of bidirectional position sensing (e.g., open/closed + direction) without mechanical toggles. |
| Chopper-stabilized architecture | Reduces offset drift to < ±0.5 G/°C, ensuring stable BOP/BRP thresholds across −40°C to +85°C. |
| Ultra-low-power sleep cycling | 30 ms sampling period with 45 µs wake latency - balances responsiveness and energy efficiency for intermittent sensing. |
| Integrated ESD protection | 6 kV HBM on all pins eliminates need for discrete ESD components in cost-sensitive consumer designs. |
| Small-footprint DFN packaging | X2-DFN1410-4 occupies only 1.4 mm² PCB area - ideal for space-constrained mobile and wearable applications. |
Applications
| Smart Cover Detection | Lid/Tray Position Sensing |
|---|---|
Use Scenario: Detecting flip-open/closed state of tablet or laptop smart covers using embedded magnets. IC Role / Device Role / Timing Role: Dual-output Hall switch providing separate N- and S-pole signals to distinguish cover orientation and motion direction. Use Value: Eliminates mechanical switches, reduces system power via 1.1 µA sleep current, and enables reliable detection with low-profile 1.4 mm × 1.0 mm footprint. | Use Scenario: Monitoring open/closed status of refrigerator doors, washing machine lids, or server tray positions. IC Role / Device Role / Timing Role: Contactless position switch with hysteresis to prevent false triggers from vibration or magnet misalignment. Use Value: Supports wide operating temperature (−40°C to +85°C), withstands repeated mechanical stress, and interfaces directly with 3.3 V PLC inputs. |
| Digital Camera Lens Position | Handheld Gaming Console Docking |
Use Scenario: Sensing lens barrel extension/retraction in compact digital still/video cameras. IC Role / Device Role / Timing Role: Unipolar Hall sensor detecting magnet polarity shift during lens movement to trigger focus or power sequencing. Use Value: Dual outputs allow single-sensor detection of both extension (S-pole) and retraction (N-pole) events, reducing BOM count. | Use Scenario: Detecting docking alignment and orientation of handheld gaming consoles into charging cradles or display docks. IC Role / Device Role / Timing Role: Magnetic polarity discriminator confirming correct physical insertion before enabling USB-C data/power negotiation. Use Value: 6 kV ESD rating protects against user-handling discharge; 1.6 V minimum supply ensures compatibility with low-voltage dock controllers. |
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 US5781 | Single-output, higher sensitivity (BOP = ±15 G), no integrated sleep mode - IDD(avg) = 3.5 µA at 3 V. | Requires external logic for dual-pole interpretation; less suitable for ultra-low-power battery operation. | Select when higher magnetic sensitivity is needed and power budget allows >3× higher average current. |
| Allegro A1174LUA-T | Dual-output, but bipolar latching architecture (not unipolar); BOP/BRP symmetric ±30 G; no sleep mode - IDD = 4.5 mA active. | Designed for motor commutation or rotary encoding, not low-power presence detection. | Select only for applications requiring latched output behavior and continuous active monitoring. |
Compared with US5781 and A1174LUA-T, the AH1391-HK4-7 uniquely delivers true dual unipolar detection with micropower sleep, making it the only option among the three qualified for multi-year battery life in portable cover and lid-sensing applications.
Availability
AH1391-HK4-7 is available at Aetrix Electronics and suitable for smart cover detection, lid/tray position sensing, digital camera lens actuation, and handheld gaming console docking requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AH1391-HK4-7 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 solutions for consumer, industrial, and computing markets.
The AH1391 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, dual-pole magnetic position detection in space- and battery-constrained portable electronics.
FAQ
What is the function of the exposed thermal pad on the AH1391-HK4-7?
The center exposed pad on the X2-DFN1410-4 package is internally unconnected but must be soldered to a GND plane for optimal thermal dissipation and RF noise immunity. It improves junction-to-board thermal resistance by ~40% and reduces susceptibility to electromagnetic interference in noisy environments.
Can AH1391-HK4-7 drive an LED directly?
No. AH1391-HK4-7 outputs are open-drain with 2.5 mA maximum sink current and no internal pull-up. To drive an LED, an external pull-up resistor (e.g., 10 kΩ to VDD) and current-limiting resistor (e.g., 1 kΩ in series with LED) are required; the IC itself does not source or sink sufficient current for direct LED biasing.
How does the sleep mode affect response time in real-world use?
Sleep mode introduces a fixed 30 ms sampling period (typical), meaning the maximum latency between magnetic event occurrence and output change is one full cycle plus 45 µs wake time - ~30.045 ms. This is acceptable for human-interface detection (e.g., cover open/close) but unsuitable for high-speed rotor counting or motor control feedback.
Is AH1391-HK4-7 qualified for automotive applications?
No. AH1391-HK4-7 is specified for −40°C to +85°C operation and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AH1391Q) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening - contact Diodes sales for qualified alternatives.
AH1391-HK4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XFDFN 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-DFN1410-4
AH1391-HK4-7 FAQ
1.How can I place an order for AH1391-HK4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1391-HK4-7 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-HK4-7 reliable?
The price and inventory of AH1391-HK4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1391-HK4-7 is usually 5 days.
3.What payment methods are accepted for AH1391-HK4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1391-HK4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1391-HK4-7?
AH1391-HK4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1391-HK4-7 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-HK4-7?
For technical support, including AH1391-HK4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1391-HK4-7 requirements.
6.How does Aetrix verify that AH1391-HK4-7 is sourced from the original manufacturer or authorized distributors?
All AH1391-HK4-7 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-HK4-7 meets industry standards.
7.What is the process for return or replacement of AH1391-HK4-7?
All AH1391-HK4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1391-HK4-7, 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-HK4-7 part is unused and in its original packaging.
Return procedure for AH1391-HK4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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