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Diodes Incorporated AH1381-SA-7
- Part No.:
- AH1381-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1381-SA-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SSOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
AH1381-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 from 1.6V to 5.5V, draws only 1.6μA average supply current at 3V, and activates on south-pole magnetic fields with BOPS = 18G (typ) and BRPS = 11G (typ), enabling reliable lid-open detection in smart meters and smoke detectors.
For engineers reviewing the AH1381-SA-7 datasheet, AH1381-SA-7 pinout, AH1381-SA-7 application, or AH1381-SA-7 equivalent, key selection criteria include its hibernating clock architecture, chopper-stabilized temperature stability, SOT23 (Type S) package compatibility, and unipolar south-pole activation behavior - all critical for low-power IoT and appliance sensing designs.
Technical Context
The AH1381-SA-7 implements a chopper-stabilized Hall sensor with sleep/awake logic that cycles between ultra-low-power hibernation (IDD(SLEEP) = 0.6–1μA) and brief active sampling (tAWAKE = 30–80μs), achieving IDD(AVG) = 1.6–9μA across temperature and voltage. Its latch-and-output driver delivers open-drain output with VOL = 0.15–0.25V @ 1mA sink and VOH = VDD−0.25V @ −1mA source.
Magnetic switching is defined by BOPS = 10–26G and BRPS = 3–19G (at +25°C), with hysteresis BHY ≥ 2G, ensuring noise-immune transitions. The device supports full operating range from −40°C to +85°C and withstands 8kV HBM ESD without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.6V to 5.5V - enables direct interface with low-voltage MCUs and extends battery life in coin-cell-powered devices. |
| Average Supply Current | 1.6μA (typ) at 3V - allows >10-year operation on CR2032 batteries in smoke detectors and gas meters. |
| Operating Point (BOPS) | 10–26G (south pole) - provides reliable activation with common NdFeB magnets at air gaps up to 3mm. |
| Release Point (BRPS) | 3–19G (south pole) - ensures clean hysteresis margin to prevent chatter near threshold. |
| Output Type | Open-drain, active-low - eliminates need for external pull-up resistor and simplifies PCB layout. |
| ESD Rating | 8kV HBM - reduces system-level ESD protection component count in consumer and industrial enclosures. |
| Operating Temperature | −40°C to +85°C - supports deployment in outdoor smart meters and kitchen appliances without derating. |
Pinout & Package
Package: SOT23 (Type S), 3-pin surface-mount package with exposed pad not internally connected; footprint compatible with JEDEC TO-236AB standard.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - must be decoupled with 100nF capacitor placed adjacent to pin for noise immunity. |
| 2 | OUTPUT | Open-drain output - sinks up to 1mA; pulled low when B ≥ BOPS, high-impedance otherwise. |
| 3 | GND | Ground reference - forms return path for output current and internal bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernating clocking system | Reduces average current to 1.6μA while maintaining 30–80μs wake latency for responsive detection. |
| Chopper-stabilized architecture | Minimizes switch-point drift over temperature (±2G max variation from −40°C to +85°C). |
| No external pull-up required | Integrated output stage eliminates BOM cost and board space for discrete pull-up resistors. |
| High ESD robustness | 8kV HBM rating allows direct PCB mounting without guard rings or TVS diodes in most enclosures. |
| Unipolar south-pole activation | Simplifies mechanical design - only one magnet polarity needed; no polarity alignment ambiguity. |
Applications
| Smart Meter Lid Detection | Smoke Detector Cover Status |
|---|---|
Use Scenario: Detect opening of utility meter enclosure to trigger tamper alert or data logging. IC Role / Device Role / Timing Role: Unipolar Hall switch providing latched open/closed state via magnetic proximity. Use Value: Ultra-low power enables continuous monitoring on primary battery for >10 years without maintenance. |
Use Scenario: Monitor removable cover on residential smoke detector to disable alarm during battery replacement. IC Role / Device Role / Timing Role: Magnetic presence sensor asserting low output when cover is closed. Use Value: 1.6μA average current extends CR123A battery life beyond UL 217 certification requirements. |
| Laptop/Tablet Smart Cover | Appliance Door Position Sensing |
Use Scenario: Trigger sleep/wake on clamshell closure of Chromebook or Android tablet using embedded magnet. IC Role / Device Role / Timing Role: Digital Hall-effect switch interfacing directly with SoC GPIO interrupt pin. Use Value: Fast 30–80μs wake time ensures immediate system response without perceptible latency. |
Use Scenario: Confirm door closure in washing machine or refrigerator before initiating cycle or compressor start. IC Role / Device Role / Timing Role: Robust position indicator immune to vibration, dust, and humidity. Use Value: Chopper stabilization prevents false triggers during motor-induced mechanical stress or thermal cycling. |
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 A1104LLHLT-T | Higher BOPS = 35G (min), 3.5μA avg current, SOIC-8 package - larger footprint and higher power. | Requires stronger magnets or tighter air gaps; less suitable for thin-profile battery devices. | Select when higher magnetic immunity is needed in noisy industrial environments. |
| MELEXIS US1881EUA-ABA-000-REEL | BOPS = 20G (typ), 2.5μA avg current, TSOT-23 package - slightly higher power and narrower VDD range (2.5–5.5V). | Not compatible with 1.6V–2.4V microcontrollers; unsuitable for single-cell alkaline or LiFePO₄ systems. | Choose only if existing design uses Melexis ecosystem and requires identical pinout migration. |
Compared with A1104LLHLT-T and US1881EUA, the AH1381-SA-7 offers the lowest average current (1.6μA), widest supply range (1.6–5.5V), and smallest SOT23 footprint - making it optimal for space- and energy-constrained consumer and utility meter designs where south-pole-only activation suffices.
Availability
AH1381-SA-7 is available at Aetrix Electronics and suitable for smart meter tamper detection, smoke detector cover monitoring, and laptop lid-sensing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AH1381-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 industrial, consumer, and automotive markets.
The AH1381-SA-7 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic position sensing in battery-operated and energy-harvesting systems.
FAQ
What is the magnetic polarity requirement for AH1381-SA-7 activation?
The AH1381-SA-7 activates exclusively with the south pole of a magnet applied to the marked side of the package. North-pole exposure produces no output change. This unipolar behavior simplifies mechanical integration and eliminates polarity-matching errors during assembly.
Does AH1381-SA-7 require an external pull-up resistor?
No. The AH1381-SA-7 features an open-drain output stage capable of sinking 1mA, and its internal design eliminates the need for an external pull-up resistor. This reduces BOM count, saves PCB area, and improves reliability in high-volume consumer applications.
How does the hibernating clock architecture reduce power consumption?
The hibernating clock cycles the Hall sensor and signal chain into deep sleep between measurements, drawing only 0.6–1μA. It wakes every 30–80ms for <80μs to sample magnetic field and update output - achieving 1.6μA average current while retaining sub-100μs responsiveness.
Can AH1381-SA-7 operate reliably at 1.6V supply voltage?
Yes. The AH1381-SA-7 is fully specified down to 1.6V, with guaranteed performance including BOPS/BRPS thresholds, output drive strength, and wake timing across −40°C to +85°C. This enables direct use with single-cell alkaline, NiMH, or LiFePO₄ batteries without regulation.
AH1381-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:
- 3mT Trip, 2mT 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
AH1381-SA-7 FAQ
1.How can I place an order for AH1381-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1381-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 AH1381-SA-7 reliable?
The price and inventory of AH1381-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 AH1381-SA-7 is usually 5 days.
3.What payment methods are accepted for AH1381-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1381-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1381-SA-7?
AH1381-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1381-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 AH1381-SA-7?
For technical support, including AH1381-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1381-SA-7 requirements.
6.How does Aetrix verify that AH1381-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH1381-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 AH1381-SA-7 meets industry standards.
7.What is the process for return or replacement of AH1381-SA-7?
All AH1381-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1381-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 AH1381-SA-7 part is unused and in its original packaging.
Return procedure for AH1381-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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