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Allegro MicroSystems A1395SEHLX-T
- Part No.:
- A1395SEHLX-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 6-PowerWFDFN
- Datasheet:
-
A1395SEHLX-T.pdf
- Description:
- SENSOR HALL ANALOG 6MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,375
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Product details
Overview
A1395SEHLX-T from Allegro MicroSystems is a micropower 3 V linear Hall-effect sensor IC with tri-state output and user-selectable sleep mode, delivering 10 mV/G typical sensitivity, ratiometric output referenced to VREF, and <25 µA sleep current. It operates from 2.5–3.5 V supply, features high-impedance output during sleep, and targets battery-powered position sensing in compact portable electronics.
For engineers reviewing the A1395SEHLX-T datasheet, A1395SEHLX-T pinout, A1395SEHLX-T application, or A1395SEHLX-T equivalent, this page provides verified technical context, key specifications, package details, real-world use cases, and validated alternative options for low-power magnetic sensing designs.
Technical Context
The A1395SEHLX-T integrates a Hall element, dynamic offset cancellation circuitry, chopper-stabilized amplifier, and temperature-compensated gain/offset blocks in a BiCMOS monolithic IC. Its ratiometric output scales precisely with the externally applied VREF voltage-not the VCC supply-enabling stable performance across varying battery voltages.
Sleep mode is controlled via a logic-level SLEEP pin (active-high), transitioning the device between active mode (3.2 mA ICC) and ultra-low-power sleep mode (<25 µA ICC). During sleep, the output enters high-impedance state, allowing multiple A1395SEHLX-T devices to share a single ADC input without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 10 mV/G typical at TA = 25°C, VCC = VREF = 3.0 V - enables precise detection of weak magnetic fields in space-constrained applications. |
| Supply Voltage Range | 2.5–3.5 V - compatible with standard lithium-ion and coin-cell battery systems without regulation overhead. |
| Sleep Current | <25 µA - extends battery life in intermittently active sensing nodes such as smart locks or wearable gesture interfaces. |
| Active Supply Current | 3.2 mA typical - balances responsiveness and power efficiency for real-time position feedback loops. |
| Output Type | Ratiometric analog voltage (0.1–VREF–0.1 V range) referenced to VREF pin - decouples accuracy from VCC variation, simplifying system-level calibration. |
| Quiescent Output | 50% × VREF at zero Gauss - provides predictable mid-scale baseline for bidirectional field measurement. |
| Bandwidth | 10 kHz (–3 dB) - supports dynamic motion sensing up to ~1.6 kHz mechanical rotation or vibration. |
| Operating Temperature | –20°C to +85°C - suitable for consumer and industrial indoor environments including handheld tools and IoT edge sensors. |
Pinout & Package
Package: 6-pin MLP/DFN (2.0 × 3.0 mm, 0.75 mm nominal height), Pb-free with 100% matte tin leadframe plating. Exposed thermal pad improves PCB heat dissipation on multilayer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | Primary supply rail (2.5–3.5 V); powers internal regulator, amplifier, and logic circuits. |
| 2 - OUT | Analog output | Voltage output proportional to magnetic flux density; high-impedance during sleep mode. |
| 3 - GND | Ground reference | Signal and power ground return path; two GND pins provide low-impedance grounding for noise immunity. |
| 4 - GND | Ground reference | Second ground terminal; reduces ground loop impedance and improves PSRR. |
| 5 - SLEEP | Mode control input | Active-high logic input (threshold: 0.45×VCC min); toggles between active and sleep states. |
| 6 - VREF | Ratiometric reference input | External reference voltage (2.5–VCC V) that sets quiescent output and sensitivity scaling - not tied to VCC by default. |
Key Features
| Feature | Design Value |
|---|---|
| Tri-state output with sleep mode | Enables multiplexing of multiple A1395SEHLX-T sensors onto one ADC channel without external switches or buffers. |
| Ratiometric output referenced to VREF | Eliminates need for separate precision voltage reference; output accuracy tracks VREF stability, not VCC ripple or drift. |
| Dynamic offset cancellation | Reduces thermal drift and 1/f noise, maintaining ±1% linearity over –20°C to +85°C ambient range. |
| Chopper stabilization at 200 kHz | Suppresses amplifier input offset and low-frequency noise, enabling stable DC-coupled magnetic field measurement. |
| ESD protection >3 kV HBM | Robust handling during board assembly and end-user handling in portable devices without additional protection circuitry. |
| Preset sensitivity and offset at final test | Guarantees tight parametric distribution (±5% sensitivity tolerance) without system-level trimming or calibration. |
Applications
| Smartphone Flip Detection | Digital Camera Lens Position Sensing |
|---|---|
Use Scenario: Detect clamshell lid open/close state in foldable smartphones using embedded magnet and Hall sensor. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet proximity; sampled periodically during sleep/wake transitions. Use Value: Ultra-low sleep current (<25 µA) preserves standby battery life; ratiometric output ensures consistent threshold detection across aging battery voltage. |
Use Scenario: Monitor lens barrel position during autofocus and zoom actuation in compact digital cameras. IC Role / Device Role / Timing Role: Analog position transducer feeding closed-loop motor control; activated only during lens movement sequences. Use Value: 10 mV/G sensitivity resolves sub-millimeter lens travel; 10 kHz bandwidth supports fast focus response without aliasing. |
| Portable Power Tool Trigger Sensing | IoT Smart Lock Actuator Monitoring |
Use Scenario: Sense trigger pull depth in cordless drills to modulate motor speed and torque delivery. IC Role / Device Role / Timing Role: Bidirectional linear sensor measuring magnet displacement along trigger stroke; output mapped to PWM duty cycle. Use Value: Quiescent output at 50% VREF enables symmetric positive/negative field measurement; wide –20°C to +85°C range covers workshop environments. |
Use Scenario: Confirm bolt extension/retraction in battery-powered electronic deadbolts using Hall sensor and solenoid-mounted magnet. IC Role / Device Role / Timing Role: Low-power status monitor activated briefly after lock command to verify mechanical completion. Use Value: High-impedance sleep mode prevents loading of shared MCU ADC input; <25 µA current adds negligible drain to 10-year coin-cell battery life. |
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 A1393SEHLT-T | 5 mV/G sensitivity (half of A1395SEHLX-T), identical package and sleep functionality | Better suited for medium-field applications where higher sensitivity causes saturation or noise amplification | Select when magnetic gap exceeds 3 mm or field strength exceeds ±200 G - avoids output clipping while retaining same power and interface behavior. |
| MELEXIS MLX90242ELD-AAA-000-SP | Programmable sensitivity (1–20 mV/G), I²C digital output, no VREF pin, 1.7–3.6 V supply | Requires microcontroller with I²C interface; eliminates analog signal chain but adds firmware complexity | Choose for designs needing configurable gain, diagnostics, or multi-sensor synchronization - trades analog simplicity for digital flexibility and higher BOM cost. |
Compared with A1395SEHLX-T, the A1393SEHLT-T offers halved sensitivity for improved dynamic range in stronger fields, while the MLX90242 provides programmability and digital output at the cost of added software integration and loss of true analog ratiometry.
Availability
A1395SEHLX-T is available at Aetrix Electronics and suitable for battery-powered position sensing, portable tool feedback, and IoT actuator monitoring requiring stable component supply and long-term production continuity.
Supply support for A1395SEHLX-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensing and power ICs, founded in 1989 and headquartered in Manchester, NH.
The A139x family was developed specifically for ultra-low-power, high-accuracy linear Hall sensing in space- and energy-constrained consumer electronics - emphasizing micropower operation, ratiometric stability, and robust integration in miniature DFN packages.
FAQ
What is the function of the VREF pin on the A1395SEHLX-T?
The VREF pin on the A1395SEHLX-T sets the ratiometric reference voltage for both quiescent output (VOUTQ = 0.5 × VREF) and sensitivity scaling (Sens = K × VREF, where K = 3.328 for A1395SEHLX-T). Unlike VCC, VREF must be ≤ VCC and ≥ 2.5 V to maintain accuracy; it is not internally regulated and directly defines output voltage range and magnetic gain.
How does the sleep mode affect the output behavior of the A1395SEHLX-T?
In sleep mode, the A1395SEHLX-T disables its internal amplifier and bias circuits, reducing supply current to <25 µA. The OUT pin transitions to high-impedance state (≥4 MΩ), effectively disconnecting it from the load. This allows multiple A1395SEHLX-T devices to share a single ADC input without signal contention or loading errors.
Can the A1395SEHLX-T operate with VREF tied directly to VCC?
Yes - tying VREF to VCC is a valid configuration and results in a ratiometric output referenced to the supply rail. However, doing so forfeits independent control of output scaling and introduces VCC noise and ripple into the output signal. For highest accuracy, VREF should be derived from a clean, stable reference source separate from VCC.
What is the maximum magnetic field the A1395SEHLX-T can measure linearly?
The A1395SEHLX-T maintains linearity up to ±100 G under typical conditions (VCC = VREF = 3.0 V), based on its 10 mV/G sensitivity and 0.1–(VREF–0.1) V output swing. At ±100 G, output spans ~1.0 V around the 1.5 V quiescent point (for VREF = 3.0 V), staying within the specified linear range. Beyond ±100 G, output saturates but device remains undamaged.
Is the A1395SEHLX-T qualified for automotive applications?
No - Allegro explicitly states that A139x devices sold in DFN package types (including A1395SEHLX-T) are not intended for automotive applications. They lack AEC-Q100 qualification, extended temperature grade (–40°C to +125°C), and automotive-specific reliability testing. Use only in consumer, industrial, or medical applications within the rated –20°C to +85°C ambient range.
A1395SEHLX-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- A139x
- Package/Case:
- 6-PowerWFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 2.5V ~ 3.5V
- Current - Supply (Max):
- 3.2mA
- Current - Output (Max):
- -
- Resolution:
- -
- Bandwidth:
- 10kHz
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Features:
- Sleep Mode, Temperature Compensated
- Supplier Device Package:
- 6-MLP/DFN (2x3)
- Mounting Type:
- Surface Mount
A1395SEHLX-T FAQ
1.How can I place an order for A1395SEHLX-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1395SEHLX-T 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 A1395SEHLX-T reliable?
The price and inventory of A1395SEHLX-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1395SEHLX-T is usually 5 days.
3.What payment methods are accepted for A1395SEHLX-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1395SEHLX-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1395SEHLX-T?
A1395SEHLX-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1395SEHLX-T 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 A1395SEHLX-T?
For technical support, including A1395SEHLX-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1395SEHLX-T requirements.
6.How does Aetrix verify that A1395SEHLX-T is sourced from the original manufacturer or authorized distributors?
All A1395SEHLX-T 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 A1395SEHLX-T meets industry standards.
7.What is the process for return or replacement of A1395SEHLX-T?
All A1395SEHLX-T units undergo pre-shipment inspection (PSI). If there is an issue with A1395SEHLX-T, 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 A1395SEHLX-T part is unused and in its original packaging.
Return procedure for A1395SEHLX-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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