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Diodes Incorporated AH9251-W-7
- Part No.:
- AH9251-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH9251-W-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,284
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Product details
Overview
AH9251-W-7 from Diodes Incorporated is a medium-sensitivity, micropower omnipolar Hall-effect switch in SC59 package, featuring chopper stabilization, 8µA average supply current at 3V, ±60G typical operate/release points, and built-in output pull-up. It serves as a low-power magnetic position sensor in battery-operated lid detection, liquid level sensing, and industrial proximity applications.
For engineers reviewing the AH9251-W-7 datasheet, AH9251-W-7 pinout, AH9251-W-7 application, or AH9251-W-7 equivalent, this page delivers verified electrical specs, SC59 terminal mapping, real-world use cases, and validated alternative parts with documented magnetic and timing differences.
Technical Context
The AH9251 employs a chopper-stabilized Hall plate and sleep/awake timing logic to achieve thermal stability of magnetic thresholds (±10G hysteresis) and ultra-low power operation. Its digital output toggles on either north or south pole exposure above BOP (±40–80G), latching during 100ms sleep intervals.
Internal biasing, comparator, and output driver are integrated into a single die. The device operates across 2.5–5.5V supply and maintains functional performance from –40°C to +85°C, with ESD robustness rated at 5000V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - supports direct connection to Li-ion, 3.3V, or 5V rails without regulation |
| Average Supply Current | 8µA typ @3V - enables multi-year battery life in coin-cell-powered sensors |
| Operating Point (BOP) | ±40G to ±80G - detects weak magnets at >3mm air gap in compact enclosures |
| Hysteresis (BHYS) | 10G min - prevents chatter near threshold in vibrating or noisy mechanical environments |
| Sleep Mode Current | 4µA typ @3V - reduces quiescent load during 99.9% of duty cycle in periodic wake-up systems |
| Awake Time (tAW) | 150µs typ - ensures reliable sampling within fast-moving mechanical actuation windows |
| Output Type | Open-drain with internal 100kΩ pull-up - simplifies PCB layout by eliminating external resistor |
Pinout & Package
Package: SC59 - surface-mount, low-profile (0.5mm max height), 3-pin plastic package with standardized pad layout per AP02001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for Hall sensor and output driver; must be connected to system ground plane |
| 2 | OUTPUT | Open-drain digital output; sinks up to 1mA; pulled high internally to VDD |
| 3 | VDD | Power supply input; decoupling capacitor (10nF) required between VDD and GND |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar switching | Detects both north and south magnetic poles - eliminates magnet polarity orientation constraints in assembly |
| Chopper stabilization | Compensates for offset drift over temperature - maintains ±10G hysteresis stability from –40°C to +85°C |
| Integrated pull-up resistor | 100kΩ internal - removes need for external component, reducing BOM count and board area |
| Micropower sleep mode | 4µA current draw - extends battery life in intermittent-sensing applications like smart meter tamper detection |
| ESD robustness | 5000V HBM - withstands handling and assembly without additional protection circuitry |
Applications
| Lid/Door Position Detection | Liquid Level Sensing |
|---|---|
Use Scenario: Detect open/closed state of laptop lid, appliance door, or equipment cover using a small magnet mounted on moving part. IC Role / Device Role / Timing Role: Digital magnetic switch providing clean, debounced logic-level output synchronized to mechanical motion. Use Value: 150µs awake time ensures response within <1ms of magnet approach; 8µA average current enables >5-year operation on CR2032 cell. | Use Scenario: Monitor fluid level in tank via float-mounted magnet passing fixed Hall sensor at threshold positions. IC Role / Device Role / Timing Role: Threshold-triggered binary indicator for high/low level alarms in battery-powered water meters or chemical dispensers. Use Value: ±60G operate point allows reliable detection through 2–4mm plastic wall; hysteresis prevents false triggers from sloshing. |
| Handheld Wireless Proximity | Battery-Powered Industrial Sensor |
Use Scenario: Enable/disable display backlight or radio subsystem when smartphone or remote control is docked or stowed. IC Role / Device Role / Timing Role: Low-power presence detector interfacing directly to MCU GPIO with no external components. Use Value: Omnipolar operation tolerates magnet misalignment during docking; SC59 footprint fits tight PCB spaces under bezels. | Use Scenario: Monitor actuator position or safety interlock status in factory automation panels powered by 3.3V backup batteries. IC Role / Device Role / Timing Role: Fail-safe magnetic position monitor with guaranteed operation across industrial temperature range. Use Value: –40°C to +85°C rating and 5000V HBM ensure reliability in uncontrolled environments; TO92S/SC59 dual sourcing avoids single-package risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL33030W-7 | Higher sensitivity (BOP ±25G), no internal pull-up, 12µA avg current | Better for weak-field detection but requires external pull-up and consumes more power | Select when detecting smaller magnets at longer distances; avoid if minimizing BOM count is critical |
| US1881N-7 | Unipolar (south-only), 10µA avg current, 100µs awake time | Lower cost but requires precise magnet polarity alignment and offers less noise immunity | Select for cost-sensitive, polarity-controlled designs where magnet orientation is fixed and predictable |
Compared with AL33030W-7 and US1881N-7, the AH9251-W-7 uniquely balances low power (8µA), built-in pull-up, and true omnipolarity-making it optimal for space-constrained, battery-dependent systems requiring field-agnostic mounting and minimal external components.
Availability
AH9251-W-7 is available at Aetrix Electronics and suitable for lid position detection, liquid level sensing, handheld proximity monitoring, and battery-powered industrial sensor applications requiring stable component supply and long-term lifecycle support.
Supply support for AH9251-W-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 AH9251 belongs to Diodes' Hall-effect switch product line, engineered specifically for ultra-low-power magnetic sensing in portable and maintenance-free systems where battery longevity and mechanical simplicity are primary design drivers.
FAQ
What is the maximum recommended operating voltage for AH9251-W-7?
The absolute maximum VDD is 7V, but the recommended operating range is strictly 2.5V to 5.5V. Operation above 5.5V risks permanent damage and is not guaranteed for functionality or reliability. Designers should use voltage regulators or LDOs to maintain VDD within spec, especially in 5V systems with rail tolerance.
Does AH9251-W-7 require an external pull-up resistor?
No. The AH9251-W-7 integrates a 100kΩ pull-up resistor on the OUTPUT pin. This eliminates the need for external components in standard open-drain configurations, reducing PCB area and BOM cost. External pull-ups are only required if stronger drive capability or faster rise time is needed beyond the internal resistor's limits.
How does the sleep/awake timing affect system responsiveness?
The AH9251-W-7 wakes every ~100ms (tSL), samples magnetic field for 150µs (tAW), then returns to sleep. This yields a worst-case latency of 100ms, making it suitable for non-real-time detection (e.g., lid open/close) but unsuitable for high-speed rotation counting. For faster response, consider continuous-mode Hall switches like AH3366Q.
Can AH9251-W-7 be used in automotive under-hood applications?
No. While rated for –40°C to +85°C, the AH9251-W-7 is not AEC-Q200 qualified and lacks automotive-specific qualification (e.g., extended temperature grade, enhanced ESD, or PPAP documentation). It is intended for industrial and consumer applications; automotive under-hood use requires qualified alternatives such as the ZMD31050 or HAL15xy series.
AH9251-W-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:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±8mT Trip, ±7mT Release
- Test Condition:
- -40°C ~ 85°C
- Voltage - Supply:
- 2.5V ~ 5.5V
- Current - Supply (Max):
- 15µA
- Current - Output (Max):
- 2mA
- Output Type:
- Digital
- Features:
- Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH9251-W-7 FAQ
1.How can I place an order for AH9251-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH9251-W-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 AH9251-W-7 reliable?
The price and inventory of AH9251-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9251-W-7 is usually 5 days.
3.What payment methods are accepted for AH9251-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9251-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH9251-W-7?
AH9251-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH9251-W-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 AH9251-W-7?
For technical support, including AH9251-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9251-W-7 requirements.
6.How does Aetrix verify that AH9251-W-7 is sourced from the original manufacturer or authorized distributors?
All AH9251-W-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 AH9251-W-7 meets industry standards.
7.What is the process for return or replacement of AH9251-W-7?
All AH9251-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH9251-W-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 AH9251-W-7 part is unused and in its original packaging.
Return procedure for AH9251-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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