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Allegro MicroSystems A1382ELHLT-T
- Part No.:
- A1382ELHLT-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1382ELHLT-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:2,796
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Product details
Overview
A1382ELHLT-T from Allegro MicroSystems is a programmable linear Hall effect sensor IC with analog output, designed for high-accuracy magnetic field measurement in compact automotive and industrial systems. It delivers ratiometric 5 V operation, user-programmable quiescent voltage (2.3–2.6 V), sensitivity (4.00–6.25 mV/G), and polarity - all in a 3-pin SOT-23W surface-mount package rated for –40°C to 85°C ambient operation.
For engineers reviewing the A1382ELHLT-T datasheet, A1382ELHLT-T pinout, A1382ELHLT-T application, or A1382ELHLT-T equivalent, this page provides verified technical context, confirmed pin functions, real-world design meaning of key specs, and two validated alternative parts for continuity planning in legacy designs.
Technical Context
The A1382ELHLT-T integrates a BiCMOS Hall element, dynamic offset cancellation circuitry, and chopper-stabilized amplification operating at 170 kHz to suppress DC drift and mechanical stress effects. Its analog output is ratiometric to VCC, enabling direct interface with microcontroller ADCs without external scaling.
Programming occurs via voltage pulses applied to the VOUT pin - supporting Try mode (temporary parameter verification), Blow mode (permanent fuse-based configuration), and Lock mode (full write protection). Internal bandwidth is 17 kHz, with 27 µs typical power-on time and ±1.5% linearity/symmetry error over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V automotive and industrial rails; includes internal Zener clamp at 6–8.3 V for transient protection. |
| Sensitivity Range | 4.00–6.25 mV/G - enables precise field-to-voltage conversion across common displacement and current sensing ranges. |
| Quiescent Output | 2.3–2.6 V at B = 0 G - programmable around mid-supply for optimal ADC utilization and noise margin. |
| Internal Bandwidth | 17 kHz - supports fast-response applications like motor commutation timing and vibration monitoring. |
| Operating Temp | –40°C to +85°C - qualified for under-hood and industrial control environments without derating. |
| Output Clamps | VCLP(HIGH) = 4.35–4.65 V, VCLP(LOW) = 0.40–0.70 V - provide short-circuit diagnostics and rail-safe interfacing. |
| Noise (p-p) | 27 mV (no filter) - reduced to 4.7 mV with external 2 kHz low-pass filter, enabling high-SNR position feedback. |
Pinout & Package
Package: 3-pin SOT-23W (LH suffix), thin-profile surface-mount, 2.9 mm × 1.6 mm × 1.0 mm body height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power input | Must be bypassed with 0.1 µF capacitor to GND; supplies internal regulator and Hall bias circuitry. |
| 2 - GND | Ground reference | Common return for supply, output, and programming paths; critical for noise immunity and offset stability. |
| 3 - VOUT | Analog output & programming port | Delivers ratiometric voltage proportional to magnetic field; also accepts 14–28 V programming pulses for configuration. |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line programmability | Enables final calibration after PCB assembly - eliminates need for pre-trimmed sensors or system-level compensation. |
| Ratiometric output | Ensures consistent sensitivity and quiescent voltage across supply variations (±10%), simplifying power design in noisy environments. |
| Chopper-stabilized architecture | Reduces thermal drift and mechanical hysteresis - achieves ±50 mV quiescent output drift over full temperature range. |
| Output voltage clamps | Enable real-time short-circuit detection without external components - supports functional safety diagnostics per ISO 26262 ASIL-B concepts. |
| Programmable polarity | Allows field-direction inversion via single-bit setting - supports both north- and south-pole sensing without hardware change. |
Applications
| Throttle Position Sensing | Brake Pedal Position Monitoring |
|---|---|
Use Scenario: Non-contact angular measurement of throttle plate rotation in gasoline engines. IC Role / Device Role / Timing Role: Linear Hall sensor converting magnetic flux change into analog voltage proportional to shaft angle. Use Value: Enables closed-loop engine control with <±1.5% linearity error and stable output across –40°C to 85°C ambient. |
Use Scenario: Real-time detection of brake pedal travel for electronic stability control (ESC) systems. IC Role / Device Role / Timing Role: Analog-output Hall IC providing continuous position feedback to vehicle ECU. Use Value: Delivers 17 kHz bandwidth and ratiometric output for accurate pedal displacement tracking under varying battery voltage. |
| Current Sensing in Power Inverters | Rotary Encoder for HVAC Blower Motors |
Use Scenario: Isolated DC current measurement in 12 V automotive inverter modules. IC Role / Device Role / Timing Role: Hall sensor placed near current-carrying conductor to measure field strength proportional to load current. Use Value: Supports 4–6.25 mV/G sensitivity range and ±50 mV quiescent drift - enabling sub-5% total error over life cycle. |
Use Scenario: Compact angular position feedback for variable-speed blower motors in climate control systems. IC Role / Device Role / Timing Role: Surface-mount Hall IC detecting magnet rotation on motor shaft for speed/position loop closure. Use Value: SOT-23W footprint minimizes board space; chopper stabilization ensures repeatable zero-point after thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1389ELHLT-T | Successor device with extended temperature range (–40°C to 150°C), higher sensitivity resolution (0.125 mV/G step), and updated programming protocol. | Designed for new designs requiring AEC-Q100 Grade 0 qualification and enhanced thermal robustness in powertrain applications. | Select A1389ELHLT-T for new designs where long-term availability and extended temperature capability are required. |
| A1383ELHLT-T | Lower sensitivity range (2.75–4.25 mV/G), higher bandwidth (21 kHz), and identical pinout/package - but not pin-compatible due to different default programming states. | Better suited for high-speed current sensing where lower gain and faster response reduce phase lag in feedback loops. | Use A1383ELHLT-T only if recalibration and reprogramming are acceptable; not a drop-in replacement. |
Compared with A1382ELHLT-T, the A1389ELHLT-T offers guaranteed long-term supply and broader temperature support, while the A1383ELHLT-T trades sensitivity for speed - neither is pin- or code-compatible without firmware and calibration updates.
Availability
A1382ELHLT-T is available at Aetrix Electronics and suitable for throttle position sensing, brake pedal monitoring, current measurement in inverters, and HVAC blower motor control requiring stable component supply for legacy production and repair programs.
Supply support for A1382ELHLT-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 motion control solutions.
The A138x family was developed to deliver programmable, temperature-stable linear Hall sensors in miniature packages for automotive and industrial position/current sensing - balancing accuracy, size, and end-of-line flexibility.
FAQ
What is the operating temperature range of the A1382ELHLT-T?
The A1382ELHLT-T is specified for an operating ambient temperature range of –40°C to +85°C (Range E). This makes it suitable for under-dash and non-powertrain automotive applications, as well as industrial control panels and consumer appliances where extreme thermal stress is not expected. The device maintains its programmed sensitivity and quiescent output within datasheet limits across this full range.
Can the A1382ELHLT-T be used as a direct replacement for the A1381ELHLT-T?
No - the A1382ELHLT-T is not a direct replacement for the A1381ELHLT-T. While both share the same SOT-23W package and pinout, they differ in sensitivity range (A1381: 6.00–9.00 mV/G vs. A1382: 4.00–6.25 mV/G), internal bandwidth (12 kHz vs. 17 kHz), and pre-programmed quiescent voltage (2.1 V vs. 2.1 V but different trim distributions). System recalibration and reprogramming are required.
How is programming performed on the A1382ELHLT-T?
Programming the A1382ELHLT-T is done by applying precisely timed voltage pulses (14–28 V) to the VOUT pin - using VPM (mid-voltage) and VPH (high-voltage) sequences to select registers and blow fuses. The process supports Try mode (temporary), Blow mode (permanent), and Lock mode (write-protection). Allegro recommends using their official Sensor IC Evaluation Kit to ensure reliable fuse programming.
Does the A1382ELHLT-T require an external bypass capacitor?
Yes - the A1382ELHLT-T requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the device pins. This capacitor stabilizes the internal regulator, reduces supply noise coupling into the Hall element, and ensures proper power-on timing (tPO ≤ 27 µs) and clamp response (tCLP ≤ 30 µs). Omission causes erratic output and failed programming.
Is the A1382ELHLT-T still in active production?
No - the A1382ELHLT-T is a discontinued product. Allegro MicroSystems has ceased manufacturing the A138x family (including A1381/A1382/A1383/A1384) as of December 1, 2015. It is no longer recommended for new designs. For existing production, Aetrix Electronics maintains limited legacy stock with full traceability; contact sales for availability and last-time-buy terms.
A1382ELHLT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 8mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 17kHz
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable, Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1382ELHLT-T FAQ
1.How can I place an order for A1382ELHLT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1382ELHLT-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 A1382ELHLT-T reliable?
The price and inventory of A1382ELHLT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1382ELHLT-T is usually 5 days.
3.What payment methods are accepted for A1382ELHLT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1382ELHLT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1382ELHLT-T?
A1382ELHLT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1382ELHLT-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 A1382ELHLT-T?
For technical support, including A1382ELHLT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1382ELHLT-T requirements.
6.How does Aetrix verify that A1382ELHLT-T is sourced from the original manufacturer or authorized distributors?
All A1382ELHLT-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 A1382ELHLT-T meets industry standards.
7.What is the process for return or replacement of A1382ELHLT-T?
All A1382ELHLT-T units undergo pre-shipment inspection (PSI). If there is an issue with A1382ELHLT-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 A1382ELHLT-T part is unused and in its original packaging.
Return procedure for A1382ELHLT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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