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Allegro MicroSystems A1392SEHLX-T
- Part No.:
- A1392SEHLX-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 6-PowerWFDFN
- Datasheet:
-
A1392SEHLX-T.pdf
- Description:
- SENSOR HALL ANALOG 6MLP/DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,826
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Product details
Overview
A1392SEHLX-T from Allegro MicroSystems is a micropower 3 V linear Hall-effect sensor IC with tri-state output and user-selectable sleep mode, designed for precise magnetic field sensing in battery-constrained systems. It delivers 2.50 mV/G typical sensitivity, 50% ratiometric quiescent output (VREF-dependent), and ultra-low 25 µA sleep current. Its primary circuit role is analog magnetic field transduction in portable electronics requiring high accuracy and low power.
For engineers reviewing the A1392SEHLX-T datasheet, A1392SEHLX-T pinout, A1392SEHLX-T application, or A1392SEHLX-T equivalent, key selection considerations include its 2.5–3.5 V supply range, 6-pin MLP/DFN package, tri-state output enabling multiplexed A/D sharing, and ratiometric reference architecture tied to the VREF pin-not the supply rail.
Technical Context
The A1392SEHLX-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic offset cancellation, chopper-stabilized amplification at 200 kHz, and temperature-compensated gain/offset trimming. Its output voltage scales strictly with the externally applied VREF voltage-not VCC-enabling ratiometric performance independent of supply variation.
Sleep mode is controlled via a logic-level SLEEP pin: <0.20×VCC forces high-impedance output and sub-25 µA current draw; >0.45×VCC enables active operation with 3.2 mA typical supply current. Power-on time is 40–60 µs; power-off time is ≤1 µs, ensuring rapid state transitions without output contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.50 mV/G (typical at TA = 25°C, VCC = VREF = 3.0 V); enables precise field measurement with minimal signal conditioning |
| Supply Voltage Range | 2.5 V to 3.5 V; compatible with single-cell Li-ion and 3 V coin-cell systems without regulation |
| Sleep Current | <25 µA; extends battery life in intermittently active sensing applications like lid detection or position polling |
| Active Supply Current | 3.2 mA (typical); balances responsiveness and power efficiency for continuous monitoring |
| Output Type | Tri-state analog voltage; high-impedance during sleep allows multiple A1392SEHLX-T devices to share one ADC input |
| Ratiometric Reference | VREF pin (2.5–VCC V range); output quiescent point and sensitivity scale directly with VREF, not VCC |
| Operating Temperature | –20°C to +85°C; validated for consumer and industrial portable equipment environments |
| Output Bandwidth | 10 kHz (–3 dB); supports dynamic field measurements up to ~1.6 kHz usable signal content |
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 for enhanced PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | Primary device supply rail (2.5–3.5 V); powers internal regulator, amplifier, and logic |
| 2 - OUT | Analog output | Linear voltage output (0.1 V to VREF – 0.1 V); tri-stated (high-Z) during sleep mode |
| 3 - GND | Ground reference | Signal and power ground return; two GND pins provide low-impedance path for noise reduction |
| 4 - GND | Ground reference | Second ground terminal; improves thermal and electrical stability in compact layouts |
| 5 - SLEEP | Mode control input | Logic-controlled enable: low (<0.20×VCC) = sleep; high (>0.45×VCC) = active; no pull-up required |
| 6 - VREF | Ratiometric reference input | Defines output scaling baseline; quiescent output = 0.5×VREF; sensitivity ∝ VREF |
Key Features
| Feature | Design Value |
|---|---|
| Tri-state output architecture | Enables multiplexing of multiple A1392SEHLX-T sensors onto a single ADC channel without external switching |
| User-selectable sleep mode | Reduces current draw from 3.2 mA to <25 µA on demand-critical for battery runtime in portable tools and cameras |
| VREF-based ratiometry | Decouples output accuracy from VCC fluctuations; maintains linearity and offset stability when VREF is derived from stable source (e.g., microprocessor supply) |
| Chopper-stabilized front-end | 200 kHz chopping frequency eliminates 1/f noise and drift, delivering stable 2.50 mV/G sensitivity over temperature |
| Dynamic offset cancellation | On-chip circuitry actively nulls Hall element offset drift, ensuring ±1% symmetry and >99% ratiometric consistency across –20°C to +85°C |
| ESD protection | >3 kV HBM rating protects against handling damage during assembly and end-user integration |
Applications
| Lid Position Detection | Smartphone Camera Actuation |
|---|---|
Use Scenario: Detect open/closed state of clamshell phone or laptop lid using magnet placement near hinge. IC Role / Device Role / Timing Role: Linear Hall sensor providing analog voltage proportional to magnetic field strength as lid rotates. Use Value: Ultra-low 25 µA sleep current minimizes standby drain; tri-state output avoids contention when multiple sensors share MCU ADC. | Use Scenario: Trigger autofocus or optical image stabilization (OIS) coil movement based on lens position feedback. IC Role / Device Role / Timing Role: High-accuracy linear field transducer interfacing with closed-loop motor control system. Use Value: 2.50 mV/G sensitivity and 10 kHz bandwidth support fast, repeatable lens positioning; VREF ratiometry ensures consistent response across battery voltage sag. |
| Portable Power Tool RPM Sensing | Digital Camera Shutter Control |
Use Scenario: Monitor motor rotation speed via embedded magnet on rotor shaft in cordless drills or saws. IC Role / Device Role / Timing Role: Analog magnetic field detector feeding signal to MCU for real-time RPM calculation. Use Value: Wide –20°C to +85°C operating range withstands tool housing heat; 3.2 mA active current enables continuous sampling without thermal throttling. | Use Scenario: Confirm shutter blade position during exposure cycle using magnet-actuated Hall sensing. IC Role / Device Role / Timing Role: Precision linear sensor verifying mechanical actuator endpoint with sub-millimeter resolution. Use Value: Ratiometric output referenced to stable VREF (e.g., MCU LDO) eliminates supply-induced error; 60 µs power-on time ensures timely response within shutter timing budget. |
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 |
|---|---|---|---|
| AL33030EUA-12 | Higher sensitivity (5 mV/G), fixed 3.3 V supply, no VREF pin or sleep mode | Requires regulated 3.3 V supply; lacks power-gating capability for battery optimization | Select when higher sensitivity is prioritized over ultra-low-power operation and ratiometric flexibility |
| DRV5053VAQLPGM | 2.5–38 V supply range, integrated 3.3 V LDO, no external VREF; 3.5 mV/G sensitivity | Wider supply tolerance suits automotive body electronics; no VREF-based ratiometry or tri-state output | Select for broad-voltage industrial systems where VREF decoupling and multi-sensor sharing are not required |
Compared with AL33030EUA-12 and DRV5053VAQLPGM, the A1392SEHLX-T uniquely combines VREF-referenced ratiometry, user-controllable sleep mode, and tri-state output-making it optimal for multiplexed, battery-powered portable designs demanding precision and minimal quiescent power.
Availability
A1392SEHLX-T is available at Aetrix Electronics and suitable for portable consumer electronics, industrial handheld tools, and digital imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for A1392SEHLX-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 semiconductor company specializing in high-performance magnetic sensing and power ICs for motion control, energy efficiency, and safety-critical systems.
The A139x family was engineered specifically for micropower linear Hall sensing in space- and energy-constrained portable devices, emphasizing ratiometric accuracy, sleep-mode controllability, and robustness in consumer-grade thermal environments.
FAQ
What is the function of the VREF pin on the A1392SEHLX-T?
The VREF pin on the A1392SEHLX-T sets the ratiometric reference for both quiescent output voltage (VOUTQ = 0.5 × VREF) and sensitivity (Sens ∝ VREF). Unlike the supply rail (VCC), VREF must be between 2.5 V and VCC to maintain accuracy; applying VREF < 2.5 V degrades device performance. This architecture isolates output scaling from VCC variations, enabling stable operation even with fluctuating battery voltage.
How does the sleep mode of the A1392SEHLX-T affect its output behavior?
When the SLEEP pin voltage drops below 0.20 × VCC, the A1392SEHLX-T enters sleep mode: supply current falls to <25 µA and the OUT pin transitions to high-impedance (tri-state). During this state, the output is invalid and electrically disconnected-allowing multiple A1392SEHLX-T devices to share a single ADC input without loading or contention. Output resumes valid analog voltage within 60 µs after SLEEP rises above 0.45 × VCC.
Can the A1392SEHLX-T operate with a 2.5 V supply, and what impact does that have on performance?
Yes, the A1392SEHLX-T is fully specified for 2.5 V to 3.5 V operation. At 2.5 V supply, typical active current remains 3.2 mA, and sensitivity stays at 2.50 mV/G (with VREF = 2.5 V). However, VREF must be ≤ VCC, so ratiometric reference is constrained to 2.5 V maximum-reducing full-scale output swing. Performance degradation occurs only if VREF < 2.5 V, per datasheet specification.
What is the significance of the "SEHLX-T" suffix in A1392SEHLX-T?
The "SEHLX-T" suffix identifies the A1392SEHLX-T as a 6-pin MLP/DFN package (EH), tape-and-reel packaging (T), RoHS-compliant (S), and commercial temperature grade (E). The "LX" denotes lead-free construction with 100% matte tin leadframe plating and conforms to JEDEC-standard DFN footprint (2.0 × 3.0 mm, 0.75 mm height), distinguishing it from older SOIC or SIP variants in the A139x family.
Is the A1392SEHLX-T suitable for automotive applications?
No-the A1392SEHLX-T is explicitly not intended for automotive applications, as stated in the Allegro datasheet Selection Guide footnote [2]. It is qualified for commercial temperature range (–20°C to +85°C) and lacks AEC-Q100 qualification, extended temperature grading, or automotive-specific reliability testing. For automotive use, Allegro recommends A132x or A136x families with appropriate qualification and packaging.
A1392SEHLX-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
A1392SEHLX-T FAQ
1.How can I place an order for A1392SEHLX-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1392SEHLX-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 A1392SEHLX-T reliable?
The price and inventory of A1392SEHLX-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1392SEHLX-T is usually 5 days.
3.What payment methods are accepted for A1392SEHLX-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1392SEHLX-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1392SEHLX-T?
A1392SEHLX-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1392SEHLX-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 A1392SEHLX-T?
For technical support, including A1392SEHLX-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1392SEHLX-T requirements.
6.How does Aetrix verify that A1392SEHLX-T is sourced from the original manufacturer or authorized distributors?
All A1392SEHLX-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 A1392SEHLX-T meets industry standards.
7.What is the process for return or replacement of A1392SEHLX-T?
All A1392SEHLX-T units undergo pre-shipment inspection (PSI). If there is an issue with A1392SEHLX-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 A1392SEHLX-T part is unused and in its original packaging.
Return procedure for A1392SEHLX-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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