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Allegro MicroSystems A1395SEHLT-T
- Part No.:
- A1395SEHLT-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 6-PowerWFDFN
- Datasheet:
-
A1395SEHLT-T.pdf
- Description:
- SENSOR HALL ANALOG 6MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:95,225
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Product details
Overview
A1395SEHLT-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, <25 µA sleep current, and ratiometric output referenced to the VREF pin. It operates from 2.5–3.5 V supply, features dynamic offset cancellation, and targets battery-powered position sensing in portable electronics.
For engineers reviewing the A1395SEHLT-T datasheet, A1395SEHLT-T pinout, A1395SEHLT-T application, or A1395SEHLT-T equivalent, key selection criteria include its 10 mV/G sensitivity grade, 6-pin MLP/DFN package, tri-state output behavior during sleep, ratiometric reference architecture using VREF, and compatibility with multi-sensor sharing of a single ADC input.
Technical Context
The A1395SEHLT-T integrates a Hall element, BiCMOS amplifier, chopper-stabilized dynamic offset cancellation circuitry, and temperature-compensated gain/offset programming. Its output voltage is ratiometric to the externally supplied VREF voltage-not the VCC supply-enabling precise magnetic field measurement independent of VCC variation.
Sleep mode is controlled via a logic-level SLEEP pin: high (>0.45×VCC) enables active operation (3.2 mA typical ICC); low (<0.20×VCC) forces high-impedance output and reduces current to <25 µA. Power-on time is 40–60 µs; power-off time is ≤1 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 10 mV/G typical at TA = 25°C, VCC = VREF = 3.0 V - defines magnetic field resolution per unit output voltage swing. |
| Sleep Current | <25 µA - enables multi-year battery life in always-on portable sensors. |
| Active Supply Current | 3.2 mA typical - balances responsiveness and power budget for periodic wake-up sensing. |
| Supply Range | 2.5 V to 3.5 V - compatible with single-cell Li-ion and Li-poly battery systems. |
| Output Type | Tri-state analog voltage - high-impedance during sleep allows multiplexing multiple A1395SEHLT-T outputs onto one ADC channel. |
| Ratiometric Reference | VREF pin (2.5–VCC V range) - decouples output scaling from VCC noise, improving measurement accuracy when VREF is derived from stable source. |
| Quiescent Output | 0.500 × VREF - provides predictable zero-field baseline independent of VCC drift. |
| Operating Temperature | –20°C to +85°C - supports consumer and industrial indoor environments without derating. |
Pinout & Package
Package: 6-pin MLP/DFN (2.0 × 3.0 mm, 0.75 mm height), Pb-free, 100% matte tin leadframe plating, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | Primary device supply rail (2.5–3.5 V); powers internal regulator and analog circuits. |
| 2 - OUT | Analog output | Linear voltage output (0.1 V to VREF – 0.1 V) proportional to applied magnetic field; tri-states to >4 MΩ in sleep mode. |
| 3 - GND | Ground reference | Primary ground return for VCC, OUT, and internal circuitry; pin 4 is second GND connection for low-impedance return path. |
| 4 - GND | Ground reference | Dual ground terminal improves noise immunity and thermal dissipation; must be connected to PCB ground plane. |
| 5 - SLEEP | Mode control input | Logic-controlled enable: HIGH (>0.45×VCC) activates device; LOW (<0.20×VCC) forces sleep and high-Z output. |
| 6 - VREF | Ratiometric reference input | Defines output scaling and quiescent point (VOUTQ = 0.5×VREF); must be ≤ VCC and ≥2.5 V for full accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Tri-state output with sleep mode | Enables shared ADC inputs across multiple A1395SEHLT-T sensors without external multiplexers or isolation circuitry. |
| Ratiometric output referenced to VREF | Eliminates VCC supply noise coupling into magnetic measurement, enabling accurate field sensing even with noisy battery rails. |
| Dynamic offset cancellation | Reduces thermal drift and 1/f noise, maintaining ±1% linearity and symmetry over –20°C to +85°C ambient range. |
| Preset sensitivity and offset at final test | Guarantees 10 mV/G sensitivity and 50% VREF quiescent output without system-level calibration. |
| Chopper stabilization at 200 kHz | Suppresses low-frequency drift and offset errors, supporting stable DC magnetic field measurements in static applications. |
| ESD protection >3 kV HBM | Provides robust handling during board assembly and end-user integration without additional protection components. |
Applications
| Smartphone Lid Detection | Digital Camera Lens Position |
|---|---|
Use Scenario: Detect open/closed state of flip covers or clamshell hinges in smartphones. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet proximity; sleep mode activated between lid events to conserve battery. Use Value: 25 µA sleep current extends standby battery life to multi-month duration; 10 mV/G sensitivity resolves sub-millimeter hinge movement. | Use Scenario: Monitor lens barrel extension/retraction in compact digital cameras. IC Role / Device Role / Timing Role: Analog position transducer interfaced to camera MCU's ADC; triggered only during lens actuation to minimize power draw. Use Value: Tri-state output allows co-location with other Hall sensors on same ADC channel; ratiometric VREF reference ensures consistent focus calibration across battery discharge cycles. |
| Portable Power Tool RPM Sensing | Wearable Fitness Tracker Motion Capture |
Use Scenario: Measure motor rotation speed via embedded magnet on rotating shaft in cordless drills or saws. IC Role / Device Role / Timing Role: Magnetic field amplitude sensor sampling at ~10 kHz bandwidth; active only during tool operation. Use Value: 10 kHz output bandwidth supports up to 60,000 RPM sensing; 3.2 mA active current enables real-time feedback without overheating in confined tool housings. | Use Scenario: Track joint angle or limb orientation using magnets on wearable bands and inertial fusion. IC Role / Device Role / Timing Role: Low-power magnetic position node synchronized with accelerometer data; sleeps between motion events. Use Value: Micropower design (<25 µA sleep) enables weeks of continuous wear; preset 10 mV/G sensitivity eliminates factory calibration per unit. |
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 |
|---|---|---|---|
| A1393SEHLT-T | 5 mV/G sensitivity (half that of A1395SEHLT-T); otherwise identical pinout, package, and electrical interface. | Lower sensitivity suits applications requiring wider magnetic field range or reduced signal amplification. | Select when magnetic gap is larger or signal conditioning headroom is constrained. |
| AL33030EUST-7 | 5.5 mV/G sensitivity, 1.8–5.5 V supply range, integrated EEPROM for user calibration; different 6-pin TDFN package (2.5 × 2.5 mm). | Supports wider supply voltage and field-programmable offset/sensitivity; lacks tri-state output and VREF-based ratiometry. | Choose when system requires programmability or dual-supply flexibility, accepting trade-offs in power efficiency and ADC sharing capability. |
Compared with A1393SEHLT-T, the A1395SEHLT-T delivers double sensitivity for finer position resolution in tight-gap designs; compared with AL33030EUST-7, it offers superior micropower performance and native ADC multiplexing but less configurability and narrower supply range.
Availability
A1395SEHLT-T is available at Aetrix Electronics and suitable for smartphone lid detection, digital camera lens positioning, portable power tool RPM sensing, and wearable fitness tracker motion capture requiring stable component supply and long-term production continuity.
Supply support for A1395SEHLT-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 engineered specifically for ultra-low-power, high-accuracy linear Hall-effect sensing in battery-operated consumer electronics, emphasizing micropower sleep modes, ratiometric stability, and system-level integration simplicity.
FAQ
What is the sensitivity of the A1395SEHLT-T, and how is it defined?
The A1395SEHLT-T has a typical sensitivity of 10 mV/G at 25°C with VCC = VREF = 3.0 V. This means its output voltage changes by approximately 10 millivolts per Gauss of applied magnetic flux density perpendicular to the package top surface. Sensitivity scales linearly with VREF voltage per the equation K × VREF, where K = 3.328 for the A1395SEHLT-T.
How does the A1395SEHLT-T achieve ultra-low power consumption in sleep mode?
The A1395SEHLT-T achieves <25 µA sleep current by disabling its internal amplifier, chopper circuitry, and Hall bias current when the SLEEP pin is driven LOW (<0.20×VCC). During this state, the output enters high-impedance mode, eliminating loading on downstream circuitry and enabling true zero-power sensing intervals in battery-constrained applications.
Can multiple A1395SEHLT-T sensors share a single ADC input, and how is this implemented?
Yes - the A1395SEHLT-T's tri-state output allows multiple units to connect to one ADC input. Only one A1395SEHLT-T is held in active mode (SLEEP HIGH) while others remain in sleep (SLEEP LOW), placing their outputs in high-impedance state. The microcontroller sequences SLEEP signals to read each sensor individually, eliminating need for external analog switches or multiplexers.
What is the role of the VREF pin on the A1395SEHLT-T, and why is it separate from VCC?
The VREF pin sets the ratiometric reference for both quiescent output (VOUTQ = 0.5×VREF) and sensitivity scaling. It is separate from VCC to decouple magnetic measurement accuracy from VCC supply noise or droop. When VREF is derived from a clean, stable source (e.g., precision LDO), the A1395SEHLT-T maintains consistent sensitivity and zero-point regardless of VCC fluctuations caused by load transients.
Is the A1395SEHLT-T suitable for automotive applications?
No - Allegro explicitly states that A139x devices sold in DFN package types, including the A1395SEHLT-T, are not intended for automotive applications. They are qualified for commercial/industrial temperature range (–20°C to +85°C) and lack AEC-Q200 qualification, automotive-grade ESD robustness, or extended temperature support required for under-hood or safety-critical vehicle systems.
A1395SEHLT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- A139x
- Package/Case:
- 6-PowerWFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
A1395SEHLT-T FAQ
1.How can I place an order for A1395SEHLT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1395SEHLT-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 A1395SEHLT-T reliable?
The price and inventory of A1395SEHLT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1395SEHLT-T is usually 5 days.
3.What payment methods are accepted for A1395SEHLT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1395SEHLT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1395SEHLT-T?
A1395SEHLT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1395SEHLT-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 A1395SEHLT-T?
For technical support, including A1395SEHLT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1395SEHLT-T requirements.
6.How does Aetrix verify that A1395SEHLT-T is sourced from the original manufacturer or authorized distributors?
All A1395SEHLT-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 A1395SEHLT-T meets industry standards.
7.What is the process for return or replacement of A1395SEHLT-T?
All A1395SEHLT-T units undergo pre-shipment inspection (PSI). If there is an issue with A1395SEHLT-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 A1395SEHLT-T part is unused and in its original packaging.
Return procedure for A1395SEHLT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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