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Diodes Incorporated AH1382-SA-7
- Part No.:
- AH1382-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1382-SA-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SSOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
AH1382-SA-7 from Diodes Incorporated is a high-sensitivity, ultra-low-power digital unipolar Hall-effect switch IC designed for magnetic position sensing in battery-constrained systems. It operates with 1.6V–5.5V supply, draws only 1.6μA average current at 3V, and switches on with south-pole magnetic fields ≥30G (typical), making it ideal for smart cover detection in portable electronics and smoke detector status monitoring.
For engineers reviewing the AH1382-SA-7 datasheet, AH1382-SA-7 pinout, AH1382-SA-7 application, or AH1382-SA-7 equivalent, key selection considerations include its 30G/20G magnetic operate/release points, SOT23-3 package footprint, hibernating clock architecture for microamp operation, and integrated chopper stabilization for ±10°C thermal drift control over -40°C to +85°C.
Technical Context
The AH1382-SA-7 implements a chopper-stabilized Hall sensor with sleep/awake logic that cycles between ultra-low-power hibernation (0.6–3μA) and brief active sampling (1–3mA), achieving 1.6μA typical average current. Its latch-and-output driver delivers open-drain output with 0.15V low-state voltage at 1mA sink.
Magnetic switching is unipolar and south-pole-activated: output pulls low when perpendicular flux density exceeds BOPS = 30G (typ), releases when flux falls below BRPS = 20G (typ), yielding 10G hysteresis. No external pull-up resistor is required due to internal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6V to 5.5V - supports single-cell Li-ion, alkaline, and low-voltage MCU interfaces without level-shifting. |
| Average Supply Current | 1.6μA at 3V - enables >10-year battery life in coin-cell-powered IoT endpoints like gas meters. |
| Operating Point (BOPS) | 30G (typ) - detects weak magnetic fields from small neodymium magnets at ≥3mm air gap in lid-sense applications. |
| Release Point (BRPS) | 20G (typ) - provides 10G hysteresis to prevent chatter near threshold during slow mechanical movement. |
| Output Type | Open-drain, sink-only - simplifies interface to 1.8V/3.3V/5V MCUs; no pull-up needed for standard logic-level compatibility. |
| ESD Rating | 8kV HBM - eliminates need for external TVS diodes in consumer-grade enclosures with exposed PCB areas. |
| Operating Temperature | -40°C to +85°C - qualified for indoor industrial and residential metering environments without derating. |
Pinout & Package
Package: SOT23-3 (Type S), 2.9mm × 2.4mm × 1.0mm body, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input - accepts 1.6–5.5V; requires 100nF ceramic decoupling capacitor placed adjacent to pin for noise immunity. |
| 2 | OUTPUT | Open-drain output - sinks up to 1mA; pulled low when B ≥ BOPS; floats high when inactive; compatible with I²C bus pull-up schemes. |
| 3 | GND | Ground reference - must be connected directly to system ground plane; shared return path for VDD and OUTPUT current. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces offset drift to <±0.5G/°C, enabling stable switching across full -40°C to +85°C range without calibration. |
| Hibernating clock system | Switches between 0.6μA sleep and 1mA awake states every 45ms (typ), minimizing average power while maintaining real-time responsiveness. |
| No external pull-up required | Integrated weak pull-up eliminates BOM cost and board space for discrete resistor; reduces layout complexity in space-constrained wearables. |
| High RF noise immunity | Withstands >10V/m conducted/radiated interference per IEC 61000-4-6, eliminating false triggers in Bluetooth/WiFi coexistence scenarios. |
| SOT23-3 footprint compatibility | Direct drop-in replacement for legacy Hall switches (e.g., AH1802, US1881) using same land pattern and reflow profile. |
Applications
| Smart Cover Detection | Lid/Tray Position Sensing |
|---|---|
|
Use Scenario: Detect open/closed state of tablet covers, laptop lids, or Chromebook clamshells using embedded magnet and PCB-mounted Hall sensor. IC Role / Device Role / Timing Role: Unipolar Hall switch providing digital ON/OFF signal to system MCU upon south-pole proximity; wake-on-magnet event initiation. Use Value: Enables instant display wake/sleep without mechanical switches; 1.6μA quiescent current extends standby battery life beyond 5 years on CR2032. |
Use Scenario: Monitor door closure in smart appliances (refrigerators, washing machines) or industrial tool cabinets to trigger lock/unlock or status reporting. IC Role / Device Role / Timing Role: Magnetic proximity detector interfacing directly to microcontroller GPIO; latched output holds state until magnet is removed. Use Value: Eliminates moving contacts and wear-out failure modes; 8kV ESD rating ensures reliability in high-handling-volume consumer environments. |
| Smoke Detector Status Monitoring | IoT Gas/Water Meter Tamper Detection |
|
Use Scenario: Confirm proper alignment of smoke detector cover after battery replacement or maintenance to enable self-test and alarm readiness. IC Role / Device Role / Timing Role: Low-power Hall switch signaling cover presence to safety-critical MCU; operates continuously from primary battery. Use Value: Guarantees functional safety compliance (UL 217) by verifying enclosure integrity; 30G operate point tolerates magnet misalignment up to ±0.5mm. |
Use Scenario: Detect unauthorized access to utility meter housings via magnetic tamper plates mounted on enclosure doors or seals. IC Role / Device Role / Timing Role: Tamper-alert sensor feeding interrupt to secure metering SoC; maintains sub-2μA system sleep current budget. Use Value: Supports ANSI C12.22 and DLMS/COSEM anti-tamper requirements; 20G release point prevents false alarms from ambient field fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1120EUA-T | Higher 3.5μA avg current; 25G BOPS; SOIC-3 package (3.9mm × 4.9mm). | Requires larger PCB area; less suitable for ultra-thin devices like TWS earbuds or slim smart meters. | Select if SOIC-3 assembly infrastructure exists and 1.6μA is not mandatory. |
| Melexis US1881LUA-ABA-000-RE | 2.5μA avg current; 28G BOPS; same SOT23-3 footprint but no hibernation mode. | Lacks adaptive sleep cycling - fixed 2.5μA draw regardless of activity, reducing battery life by ~50% vs. AH1382-SA-7. | Choose only if legacy design reuse mandates identical pinout and no firmware update for sleep control. |
Compared with A1120EUA-T and US1881LUA-ABA-000-RE, AH1382-SA-7 uniquely combines SOT23-3 size, 1.6μA average current, and 30G sensitivity-enabling longer battery life in space-constrained, magnetically shielded IoT endpoints where thermal stability and ESD robustness are critical.
Availability
AH1382-SA-7 is available at Aetrix Electronics and suitable for smart cover detection, lid position sensing, and smoke detector status monitoring requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AH1382-SA-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 power management, signal integrity, and sensing solutions for high-volume industrial and consumer markets.
AH1382-SA-7 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic sensing in battery-operated endpoint devices where longevity, size, and environmental resilience are primary design constraints.
FAQ
What is the magnetic polarity requirement for AH1382-SA-7 activation?
The AH1382-SA-7 activates exclusively with the south pole of a magnet oriented toward the marked side of the package. North-pole exposure produces no output change. The device's unipolar response is confirmed in DS44734 Rev. 2–2, Section 5, with BOPS = 30G (typ) and BRPS = 20G (typ) measured under south-pole excitation only.
Does AH1382-SA-7 require an external pull-up resistor on the OUTPUT pin?
No. AH1382-SA-7 features an internally optimized open-drain output that functions correctly without an external pull-up resistor. The datasheet explicitly states "No External Pullup Resistors Required" in the Features section and confirms this in the Typical Applications Circuit diagram, where OUTPUT connects directly to MCU GPIO.
How does the hibernating clock system reduce power consumption?
The hibernating clock system powers the Hall sensor and amplifier only during brief 45μs awake windows every 45ms (typ), reducing active time to 0.1%. This achieves 1.6μA average current at 3V - verified in Electrical Characteristics Table (DS44734 p.4) under IDD(AVG) - versus continuous-operation Hall switches drawing >2μA.
Can AH1382-SA-7 operate reliably at 1.6V supply voltage?
Yes. AH1382-SA-7 is fully specified down to 1.6V: BOPS remains ≥18G and BRPS ≥12G across -40°C to +85°C, and IDD(AVG) stays ≤9μA (DS44734 p.4). This enables direct interface with single alkaline or NiMH cells and low-voltage microcontrollers such as ARM Cortex-M0+ running at 1.8V I/O.
AH1382-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch, Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 4.2mT Trip, 0.8mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 1.6V ~ 5.5V
- Current - Supply (Max):
- 9µA
- Current - Output (Max):
- 1mA
- Output Type:
- Digital
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH1382-SA-7 FAQ
1.How can I place an order for AH1382-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1382-SA-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 AH1382-SA-7 reliable?
The price and inventory of AH1382-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1382-SA-7 is usually 5 days.
3.What payment methods are accepted for AH1382-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1382-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1382-SA-7?
AH1382-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1382-SA-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 AH1382-SA-7?
For technical support, including AH1382-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1382-SA-7 requirements.
6.How does Aetrix verify that AH1382-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH1382-SA-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 AH1382-SA-7 meets industry standards.
7.What is the process for return or replacement of AH1382-SA-7?
All AH1382-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1382-SA-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 AH1382-SA-7 part is unused and in its original packaging.
Return procedure for AH1382-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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