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Diodes Incorporated AH49FQ-W-7
- Part No.:
- AH49FQ-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Linear, Compass (ICs)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH49FQ-W-7.pdf
- Description:
- HALL LINEAR SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
AH49FQ-W-7 from Diodes Incorporated is a linear Hall effect IC designed for contactless magnetic field sensing in automotive and industrial systems. It delivers a ratiometric analog voltage output (2.5 V ±0.25 V at B=0 G, 5 V supply), with sensitivity of 2.1 mV/Gauss, ±800 Gauss linear range, and operates from 3 V to 8 V supply across –40°C to +105°C. Used in position, liquid level, and motor control sensing.
For engineers reviewing the AH49FQ-W-7 datasheet, AH49FQ-W-7 pinout, AH49FQ-W-7 application, or AH49FQ-W-7 equivalent, this page provides verified functional specifications, SC59 package layout, AEC-Q100 Grade 2 qualification status, temperature-stable quiescent output, and real-world use cases in ferrous detection and rotary encoders.
Technical Context
The AH49FQ-W-7 integrates a Hall sensor element, low-noise amplifier, and precision resistor network on a single die to deliver stable, temperature-compensated analog output. Its architecture supports bidirectional magnetic field response (±Gauss) without polarity switching circuitry.
It features a single sourcing output stage with 60–120 Ω output impedance, enabling direct interface to ADCs or op-amps without external buffering. The device's 410 Hz–10 kHz noise bandwidth (90 μV RMS) eliminates need for external RC filtering in most motion-sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 8 V - Supports standard 5 V and 3.3 V rails; max 8 V enables margin for transient spikes |
| Quiescent Output Voltage | 2.5 V ±0.25 V @ B=0 G, VCC=5 V - Enables mid-rail referencing for bipolar field measurement |
| Sensitivity | 2.1 mV/Gauss (typ) - Delivers 4.2 V full-scale swing over ±200 G, suitable for precise displacement detection |
| Linear Magnetic Range | ±800 Gauss - Covers strong neodymium magnet fields and moderate electromagnet excitation |
| Output Noise (RMS) | 90 μV - Allows sub-Gauss resolution without external filtering in 410 Hz–10 kHz band |
| Operating Temperature | –40°C to +105°C - Validated for under-hood automotive and industrial ambient conditions |
| ESD Rating | HBM 3000 V / CDM 2000 V - Robust against handling and board-level ESD events |
Pinout & Package
Package: SC59 - Surface-mount, 3-pin, low-profile (max height 0.575 mm), lead-free matte tin finish, moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts 3–8 V DC; internal regulator not present-supply must be clean and stable |
| 2 (OUT) | Analog voltage output | Current-sourcing, 60–120 Ω impedance; connects directly to 12-bit+ ADC or instrumentation amp |
| 3 (GND) | Reference ground | Must be low-impedance return path; shared with VCC return to minimize offset drift |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise analog output | 90 μV RMS noise eliminates need for external RC filter in most motion-sensing designs |
| Temperature-stable quiescent voltage | 2.5 V ±0.3 V over –40°C to +105°C enables reliable zero-field calibration across environments |
| Bidirectional magnetic response | Detects both North and South pole approach without polarity inversion circuitry or software logic |
| AEC-Q100 Grade 2 qualification | Validated for automotive applications requiring operation up to +105°C ambient and PPAP compliance |
| High instantaneous supply tolerance | Withstands 50 V transients-supports robustness in 12 V automotive power domains with load-dump immunity |
Applications
| Position Sensing | Liquid Level Sensing |
|---|---|
Use Scenario: Detecting angular or linear displacement of mechanical components using a moving magnet. IC Role / Device Role / Timing Role: Linear Hall sensor providing analog voltage proportional to magnet position relative to IC surface. Use Value: Sub-millimeter resolution enabled by ±800 G linear range and 2.1 mV/G sensitivity, eliminating need for optical or potentiometric feedback. | Use Scenario: Measuring fluid height in tanks via float-mounted magnet moving along a guide rod. IC Role / Device Role / Timing Role: Analog magnetic field transducer converting vertical magnet position into ratiometric voltage output. Use Value: Immune to condensation, vapor, and non-ferrous tank materials; stable over –40°C to +105°C without recalibration. |
| Rotary Encoders | Motor Controls |
Use Scenario: Converting shaft rotation into analog signal for speed or direction estimation in BLDC commutation. IC Role / Device Role / Timing Role: Bidirectional linear Hall element detecting alternating North/South pole passage on rotating ring magnet. Use Value: Enables smooth analog interpolation between poles; avoids digital encoder quantization error in low-speed torque control. | Use Scenario: Monitoring current in motor phase legs via magnetic field around conductor or shunt magnet. IC Role / Device Role / Timing Role: Contactless current sensor using field from conductor or integrated flux concentrator. Use Value: Galvanic isolation achieved without current transformer size/weight; 90 μV noise supports accurate <1 A detection at 5 V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1302LLHLT-T | Higher sensitivity (5 mV/G), wider supply (4.5–6 V), no AEC-Q100 Grade 2 rating | Preferred for high-resolution lab equipment; unsuitable for automotive production without additional qualification | Select when higher sensitivity outweighs automotive compliance requirements |
| Melexis MLX90242ESE-AAA-000-SP | Programmable gain/output offset, I²C interface, ±1000 G range, SC-59 compatible footprint | Supports digital calibration and multi-sensor synchronization; adds firmware overhead vs. analog simplicity | Select when system-level calibration flexibility and digital bus integration are required |
Compared with A1302LLHLT-T and MLX90242ESE-AAA-000-SP, the AH49FQ-W-7 offers best-in-class noise performance (90 μV) and guaranteed AEC-Q100 Grade 2 qualification at minimal BOM cost, making it optimal for volume automotive and industrial analog sensing where deterministic analog output and qualification traceability are mandatory.
Availability
AH49FQ-W-7 is available at Aetrix Electronics and suitable for position sensing, liquid level monitoring, and motor control applications requiring stable component supply, automotive-grade reliability, and RoHS-compliant manufacturing.
Supply support for AH49FQ-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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The AH49FQ belongs to Diodes' linear Hall effect sensor product line, engineered specifically for contactless analog position and current sensing in harsh environments where AEC-Q100 compliance and temperature stability are critical.
FAQ
What is the recommended bypass capacitor for AH49FQ-W-7?
A 100 nF ceramic capacitor placed between VCC and GND, within 2 mm of the SC59 pins, is specified in the datasheet to suppress high-frequency supply noise and stabilize quiescent output. Larger bulk capacitance (e.g., 1 µF) may be added upstream but does not replace the local 100 nF requirement.
Can AH49FQ-W-7 operate from a 3.3 V supply?
Yes-AH49FQ-W-7 is fully specified down to 3 V supply. At 3.3 V, quiescent output is ~1.65 V (ratiometric), sensitivity drops to ~1.4 mV/G, and output span narrows to ~0.8–2.5 V, remaining usable for medium-range field detection with appropriate ADC reference scaling.
Is AH49FQ-W-7 sensitive to magnet orientation relative to the package marking?
Yes-the Hall element is located beneath the top surface marked "AH49FQ" on the SC59 package. Maximum sensitivity occurs when the magnetic field vector is perpendicular to that surface (i.e., axial field). Lateral or tangential fields yield reduced response and require characterization per application.
Does AH49FQ-W-7 require external temperature compensation?
No-internal precision resistors provide factory-trimmed temperature compensation, maintaining quiescent output within ±0.3 V and sensitivity variation within ±15% over –40°C to +105°C. No external circuitry is needed for automotive-grade thermal stability.
AH49FQ-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
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- ±80mT
- Voltage - Supply:
- 3V ~ 8V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- -
- Resolution:
- -
- Bandwidth:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Supplier Device Package:
- SC-59-3
- Mounting Type:
- Surface Mount
AH49FQ-W-7 FAQ
1.How can I place an order for AH49FQ-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH49FQ-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 AH49FQ-W-7 reliable?
The price and inventory of AH49FQ-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 AH49FQ-W-7 is usually 5 days.
3.What payment methods are accepted for AH49FQ-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH49FQ-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH49FQ-W-7?
AH49FQ-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH49FQ-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 AH49FQ-W-7?
For technical support, including AH49FQ-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH49FQ-W-7 requirements.
6.How does Aetrix verify that AH49FQ-W-7 is sourced from the original manufacturer or authorized distributors?
All AH49FQ-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 AH49FQ-W-7 meets industry standards.
7.What is the process for return or replacement of AH49FQ-W-7?
All AH49FQ-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH49FQ-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 AH49FQ-W-7 part is unused and in its original packaging.
Return procedure for AH49FQ-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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