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Allegro MicroSystems A1388LLHLX-2-T
- Part No.:
- A1388LLHLX-2-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1388LLHLX-2-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
A1388LLHLX-2-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC designed for high-accuracy angular and displacement sensing in constrained PCB spaces. It delivers 2.5 mV/G sensitivity, ±1.5% linearity error, and temperature-stable quiescent output (2.5 V at 5 V supply) across –40°C to 150°C, enabling precise position feedback in automotive throttle and industrial valve actuation.
For engineers reviewing the A1388LLHLX-2-T datasheet, A1388LLHLX-2-T pinout, A1388LLHLX-2-T application, or A1388LLHLX-2-T equivalent, this page provides verified package mapping (3-pin SOT-23W), end-of-line programmed QVO temperature coefficient, clamped analog output behavior, and real-world substitution guidance for automotive-grade Hall sensing designs.
Technical Context
The A1388LLHLX-2-T integrates a BiCMOS Hall element with dynamic offset cancellation and a high-speed 400 kHz chopping scheme to suppress thermal and mechanical drift. Its internal tuned filter and low-impedance output stage support 20 kHz bandwidth while maintaining <15 mVp-p output noise at 25°C.
End-of-line programming sets both sensitivity temperature coefficient (0.12%/°C typ) and QVO temperature coefficient to sustain accuracy across –40°C to 150°C. The device implements undervoltage lockout (VUVLOHI = 3 V, VUVLOLO = 2.5 V) and output voltage clamps (0.55 V / 4.5 V at 5 V supply) for fault diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G (typ) - enables 0.4 G resolution for sub-degree angular position detection |
| Quiescent Output Voltage | 2.5 V ±12 mV at 25°C (5 V supply) - centered ratiometric baseline for bidirectional field measurement |
| Operating Temperature | –40°C to 150°C - qualified for under-hood automotive and industrial motor control environments |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V rail; includes UVLO with 0.5 V hysteresis |
| Output Bandwidth | 20 kHz (–3 dB) - supports fast-response applications like crankshaft timing and servo loop feedback |
| Linearity Error | ±1.5% - ensures monotonic output over full magnetic range without calibration interpolation |
| QVO Drift (150°C) | –20 to 0 mV - minimized by end-of-line TC programming for stable zero-field reference |
Pinout & Package
Package: 3-pin SOT-23W (2 mm × 3 mm × 1 mm), surface-mount, lead-free with 100% matte-tin plating. Thermal resistance RθJA = 110°C/W on 2-layer PCB with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Must be bypassed with 0.1 µF capacitor to GND; powers internal regulator and Hall element |
| VOUT (Pin 2) | Analog output signal | Clamped ratiometric voltage (0.55–4.5 V at 5 V supply); drives ≥4.7 kΩ load |
| GND (Pin 3) | Reference ground | Return path for supply current and output sink; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line QVO & sensitivity TC programming | Enables <10 mV QVO drift over full temperature range without external calibration |
| High-speed chopping (400 kHz) | Reduces QVO drift due to thermal stress and eliminates 1/f noise for stable DC operation |
| Ratiometric output architecture | Maintains proportional relationship between VOUT, VCC, and magnetic field - simplifies supply tolerance design |
| Output voltage clamps | Provides short-circuit diagnostic capability: VCLPLOW = 0.55 V, VCLPHIGH = 4.5 V at 5 V supply |
| Undervoltage lockout (UVLO) | Prevents invalid output during power ramp-up/down with 0.5 V hysteresis for robust startup |
Applications
| Automotive Throttle Position Sensing | Industrial Linear Actuator Feedback |
|---|---|
|
Use Scenario: Detecting precise angular rotation of throttle plate in gasoline engine management systems. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet position on rotating shaft. Use Value: ±1.5% linearity and <20 mV QVO drift at 150°C ensure accurate air-fuel ratio control without recalibration across engine life. |
Use Scenario: Monitoring piston extension in hydraulic cylinders used in construction equipment. IC Role / Device Role / Timing Role: Displacement transducer converting magnet travel into ratiometric voltage output. Use Value: 20 kHz bandwidth and clamped output enable real-time closed-loop control with built-in short-circuit fault indication. |
| Electric Power Steering (EPS) Torque Sensing | Motor Commutation Timing |
|
Use Scenario: Measuring torsion bar twist in EPS column to derive driver steering torque input. IC Role / Device Role / Timing Role: High-accuracy analog sensor capturing differential magnetic field changes from dual magnets. Use Value: End-of-line TC programming ensures <±2% sensitivity hysteresis after thermal cycling - critical for torque repeatability. |
Use Scenario: Providing commutation signals for BLDC motors in HVAC blowers and industrial pumps. IC Role / Device Role / Timing Role: Analog Hall sensor feeding ADC input for microcontroller-based rotor position estimation. Use Value: 2.5 mV/G sensitivity and 20 kHz bandwidth support high-RPM motor control up to 30,000 RPM with minimal latency. |
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 A1324LLHLT-2-T | Lower sensitivity (1.3 mV/G), no end-of-line TC programming, wider QVO drift (±25 mV over temp) | Targeted at cost-sensitive consumer applications; not qualified for 150°C automotive use | Select only if ambient temperature stays below 125°C and ±2% sensitivity drift is acceptable |
| Melexis MLX90242ESE-AAA-000-SP | Programmable sensitivity (1.5–5.0 mV/G), integrated EEPROM, higher noise (25 mVp-p) | Supports multi-point calibration and field-programmable offsets; requires SPI interface for configuration | Choose when system-level calibration flexibility outweighs need for drop-in replacement and lower noise floor |
Compared with A1388LLHLX-2-T, the A1324 offers lower cost but sacrifices temperature stability and automotive qualification, while the MLX90242 adds programmability at the expense of analog simplicity and noise performance - making A1388LLHLX-2-T optimal for fixed-gain, high-reliability analog sensing.
Availability
A1388LLHLX-2-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial linear actuator feedback, and electric power steering torque sensing requiring stable component supply across extended temperature ranges.
Supply support for A1388LLHLX-2-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 magnetic sensing and power ICs, with core expertise in Hall-effect technology and high-reliability automotive solutions.
The A1388 product line was engineered specifically for high-accuracy, temperature-stable linear position sensing in space-constrained automotive and industrial systems - emphasizing end-of-line optimization and robust EMC performance.
FAQ
What is the operating supply voltage range for the A1388LLHLX-2-T?
The A1388LLHLX-2-T operates from 4.5 V to 5.5 V with undervoltage lockout thresholds at 2.5 V (power-off) and 3.0 V (power-on). Operation outside this range risks invalid output or latch-up; the internal Zener clamp activates above 7.3 V to protect against transient overvoltage.
How does the A1388LLHLX-2-T achieve stable quiescent output across temperature?
The A1388LLHLX-2-T achieves stable quiescent output via end-of-line programming of both QVO and sensitivity temperature coefficients at Allegro's test facility. This process compensates for intrinsic Hall element drift, resulting in ≤20 mV QVO shift from –40°C to 150°C - verified per the ∆VOUT(Q) specification.
Can the A1388LLHLX-2-T be used in through-hole designs?
No - the A1388LLHLX-2-T is exclusively packaged in the 3-pin SOT-23W surface-mount format (2 mm × 3 mm × 1 mm). For through-hole mounting, Allegro offers the pin-compatible A1388LUATN-2-T in ultramini SIP package, which shares identical electrical specs and programming.
What is the maximum recommended load capacitance on the A1388LLHLX-2-T VOUT pin?
The A1388LLHLX-2-T VOUT pin supports up to 10 nF load capacitance. Exceeding this value may cause instability or overshoot during magnetic step response; the Delay to Clamp (tCLP) spec of 30 µs assumes CL = 10 nF and is validated per Figure 2 in the datasheet.
Does the A1388LLHLX-2-T require an external bypass capacitor?
Yes - a 0.1 µF ceramic bypass capacitor must be placed between VCC and GND, as close as possible to the A1388LLHLX-2-T pins. This is required for stable operation and is specified in all electrical characteristics tables; omitting it degrades noise performance and may trigger UVLO false trips.
A1388LLHLX-2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 11.5mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1388LLHLX-2-T FAQ
1.How can I place an order for A1388LLHLX-2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1388LLHLX-2-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 A1388LLHLX-2-T reliable?
The price and inventory of A1388LLHLX-2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1388LLHLX-2-T is usually 5 days.
3.What payment methods are accepted for A1388LLHLX-2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1388LLHLX-2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1388LLHLX-2-T?
A1388LLHLX-2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1388LLHLX-2-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 A1388LLHLX-2-T?
For technical support, including A1388LLHLX-2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1388LLHLX-2-T requirements.
6.How does Aetrix verify that A1388LLHLX-2-T is sourced from the original manufacturer or authorized distributors?
All A1388LLHLX-2-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 A1388LLHLX-2-T meets industry standards.
7.What is the process for return or replacement of A1388LLHLX-2-T?
All A1388LLHLX-2-T units undergo pre-shipment inspection (PSI). If there is an issue with A1388LLHLX-2-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 A1388LLHLX-2-T part is unused and in its original packaging.
Return procedure for A1388LLHLX-2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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