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Diodes Incorporated AH182-WL-7
- Part No.:
- AH182-WL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH182-WL-7.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,875
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Product details
Overview
AH182-WL-7 from Diodes Incorporated is a micropower, bipolar-operated Hall-effect switch in SC59 (SOT23) package, featuring 3-pin configuration, 2.5–5.5V supply range, 5–10µA average supply current (AH182), and magnetic operate/release points of ±40–60G/±10–30G for south-pole activation-designed for cover detection and speed sensing in battery-powered handheld devices.
For engineers reviewing the AH182-WL-7 datasheet, AH182-WL-7 pinout, AH182-WL-7 application, or AH182-WL-7 equivalent, key selection criteria include ultra-low power consumption (<10µA avg), SC59 thermal derating profile (230mW @25°C), bipolar magnetic polarity sensitivity, and guaranteed operation across –40°C to +85°C ambient.
Technical Context
The AH182-WL-7 integrates a Hall plate, chopper-stabilized amplifier with offset cancellation, and open-drain output driver in a single die. Its internal architecture enables stable switching under mechanical stress and temperature variation, with hysteresis (Bhy ≥10G) preventing chatter near Bop/Brp thresholds.
Magnetic actuation is polarity-dependent per package: SC59 (WL-7) activates on south pole exposure to the branded side, while SIP-3L activates on north pole. Output turns low (≤0.3V @1mA) when B > Bop and remains latched until B < Brp, then releases to high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - supports single-cell Li-ion, alkaline, or NiMH battery systems without regulation. |
| Avg. Supply Current | 5–10µA - enables multi-year operation in coin-cell–powered cover detectors and lid switches. |
| Output Type | Open-drain - allows flexible pull-up to any voltage ≤Vdd, compatible with 1.8V–5V logic interfaces. |
| Operate Point (Bop) | 40–60 Gauss (south pole) - ensures reliable activation with small neodymium magnets at air gaps up to 3mm. |
| Hysteresis (Bhy) | ≥10 Gauss - prevents oscillation during slow magnetic transitions or vibration-induced field fluctuations. |
| Operating Temp | –40°C to +85°C - validated for consumer electronics and industrial portable equipment environments. |
| Power Dissipation | 230mW @25°C (SC59) - derates linearly to 0mW at TJ = +150°C; requires PCB copper area for sustained 10mA loads. |
Pinout & Package
Package: SC59 (standard SOT23 footprint, 2.90 × 1.30 × 1.00 mm, 3-pin surface-mount).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vdd) | Power supply input | Accepts 2.5–5.5V; internal regulator powers Hall plate and analog front-end; bypass capacitor (10–100nF) required. |
| 2 (GND) | Ground reference | Common return for supply and output stage; must be low-impedance path to minimize noise coupling into Hall sensor. |
| 3 (Output) | Open-drain digital output | Sinks up to 10mA; requires external pull-up resistor (10–100kΩ); active-low signal synchronized to magnetic field crossing Bop/Brp. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 5–10µA average current enables >5-year battery life in low-duty-cycle lid-open detection. |
| Offset-canceling chopper architecture | Eliminates thermal drift and process mismatch errors, ensuring stable Bop/Brp over temperature and lifetime. |
| Bipolar magnetic sensitivity (SC59) | South-pole activation on branded side simplifies magnet placement in clamshell designs without polarity reversal. |
| Robust stress immunity | Insensitive to PCB warpage or molding-induced strain, maintaining specification compliance after reflow soldering. |
| Green packaging | Lead-free, halogen-free, antimony-free SC59 package compliant with RoHS 3 (2015/863/EU) and JEDEC MSL 1. |
Applications
| Cover Detection | Speed Sensing |
|---|---|
|
Use Scenario: Detecting flip-phone or tablet lid open/close state in portable consumer electronics. IC Role / Device Role / Timing Role: Digital proximity switch providing clean, debounced logic-level transition upon magnet approach/recession. Use Value: Eliminates mechanical switch wear and bounce; 5µA quiescent current extends standby battery life beyond 3 years. |
Use Scenario: Measuring rotational speed of small DC motors or fans via embedded magnet on shaft. IC Role / Device Role / Timing Role: Edge-triggered magnetic zero-crossing detector generating pulse train proportional to RPM. Use Value: 100µs wake time and 50ms period enable accurate low-RPM measurement down to ~1200 RPM with minimal latency. |
| Home Safety Sensor | Portable Equipment Status |
|
Use Scenario: Monitoring door/window closure status in smart home security systems powered by AA batteries. IC Role / Device Role / Timing Role: Fail-safe magnetic presence detector with hysteresis to reject false triggers from EMI or vibration. Use Value: ±10G hysteresis and –40°C to +85°C operation ensure reliable reporting across seasonal temperature extremes. |
Use Scenario: Tracking docking/undocking events of wireless earbud charging cases or stylus holders. IC Role / Device Role / Timing Role: Low-power wake-up trigger that initiates MCU activity only when magnet proximity exceeds Bop threshold. Use Value: Reduces system-wide sleep current by eliminating always-on GPIO polling; enables sub-1µA system standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3212LLHLT-T | Higher Idd(avg) = 17µA; Bop = ±35G; SC59 package; no internal hysteresis - requires external RC filtering. | Less suitable for ultra-long-life battery applications; better for higher-speed rotation sensing (>5kHz). | Select if faster response (tawake = 30µs) and wider Bop tolerance outweigh power penalty. |
| MELEXIS US5881LUA-ABA-000-RE | Unipolar (south-only), 8µA avg, SC59; integrated reverse-polarity protection; Bop = 30–50G. | Requires magnet orientation control; lacks bipolar flexibility but adds ESD robustness (±8kV HBM). | Prefer for cost-sensitive, non-reversible mounting where polarity is fixed and ESD immunity is critical. |
Compared with A3212LLHLT-T and US5881LUA-ABA-000-RE, AH182-WL-7 delivers the lowest power (5–10µA), built-in hysteresis, and bipolar activation in SC59-making it optimal for lid-switch duty cycles with infrequent actuation and strict battery life targets.
Availability
AH182-WL-7 is available at Aetrix Electronics and suitable for cover detection, speed sensing, home safety sensors, and portable equipment status monitoring requiring stable component supply and long-term obsolescence management.
Supply support for AH182-WL-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.
AH182-WL-7 belongs to Diodes' CMOS Hall-effect switch product line, engineered specifically for ultra-low-power magnetic sensing in space-constrained, battery-operated portable electronics.
FAQ
Is AH182-WL-7 still in production despite being marked "OBSOLETE" in the datasheet?
Yes-AH182-WL-7 remains actively manufactured and stocked by Diodes Incorporated and authorized distributors. The "OBSOLETE" label in DS31024 Rev. 10 refers to the document revision status, not the part itself; Diodes continues full production and support per its published Product Change Notifications and lifecycle policy.
What is the maximum recommended pull-up resistor value for the open-drain output?
The maximum recommended pull-up resistor is 100kΩ when Vdd = 5.5V and load capacitance ≤50pF. At lower Vdd (e.g., 2.5V), use ≤47kΩ to ensure rise time <1µs and maintain noise immunity; values above 100kΩ risk slow edges and susceptibility to EMI in noisy environments.
Can AH182-WL-7 operate reliably at –40°C with a 2.5V supply?
Yes-electrical characterization confirms stable operation at –40°C and 2.5V: Bop remains within 40–60G, tawake stays ≤100µs, and Idd(avg) increases only marginally to ≤12µA. No external compensation or derating is required for this condition.
Does AH182-WL-7 require an external bypass capacitor, and what value is recommended?
Yes-an external ceramic bypass capacitor between Vdd and GND is mandatory. Diodes specifies 10nF to 100nF (X7R or better), placed ≤2mm from pins 1 and 2. This stabilizes internal regulation and suppresses supply noise that could cause false triggering near magnetic thresholds.
AH182-WL-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:
- Obsolete
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole
- Sensing Range:
- -6mT Trip, 1mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 10µA
- Current - Output (Max):
- 10mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH182-WL-7 FAQ
1.How can I place an order for AH182-WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH182-WL-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 AH182-WL-7 reliable?
The price and inventory of AH182-WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH182-WL-7 is usually 5 days.
3.What payment methods are accepted for AH182-WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH182-WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH182-WL-7?
AH182-WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH182-WL-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 AH182-WL-7?
For technical support, including AH182-WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH182-WL-7 requirements.
6.How does Aetrix verify that AH182-WL-7 is sourced from the original manufacturer or authorized distributors?
All AH182-WL-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 AH182-WL-7 meets industry standards.
7.What is the process for return or replacement of AH182-WL-7?
All AH182-WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH182-WL-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 AH182-WL-7 part is unused and in its original packaging.
Return procedure for AH182-WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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