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Allegro MicroSystems A1308LLHLX-5-T
- Part No.:
- A1308LLHLX-5-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1308LLHLX-5-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:1,584
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Product details
Overview
A1308LLHLX-5-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC designed for high-accuracy angular and displacement sensing in compact automotive and industrial systems. It delivers 5 mV/G sensitivity, operates from –40°C to 150°C, features programmable QVO temperature coefficient, and uses a 3-pin SOT-23W surface-mount package with 2 mm × 3 mm × 1 mm footprint.
For engineers reviewing the A1308LLHLX-5-T datasheet, A1308LLHLX-5-T pinout, A1308LLHLX-5-T application, or A1308LLHLX-5-T equivalent, this device supports precision magnetic field measurement in space-constrained, high-temperature environments requiring stable analog output, UVLO protection, and chopper-stabilized offset cancellation.
Technical Context
The A1308LLHLX-5-T integrates a BiCMOS monolithic circuit with Hall element, dynamic offset cancellation, temperature-compensating circuitry, and a clamped low-impedance output stage. Its high-speed chopping scheme (400 kHz) minimizes quiescent voltage output (QVO) drift across temperature, while end-of-line programming sets both sensitivity and QVO temperature coefficients at 150°C for L-temp variants.
This device implements ratiometric operation - VOUT(Q), sensitivity, and clamp voltages scale proportionally with VCC - and includes undervoltage lockout (UVLO) with 2.5 V turn-off and 3 V turn-on thresholds. Output voltage clamps (0.40–0.70 V low, 4.35–4.65 V high) enable short-circuit diagnostics without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 4.85–5.15 mV/G - enables precise analog field measurement with ±0.5% typical deviation at 25°C |
| Operating Temp Range | –40°C to +150°C - qualified for under-hood automotive and industrial motor control applications |
| Supply Voltage | 4.5–5.5 V - ratiometric output ensures consistent scaling across supply variation |
| Quiescent Output (QVO) | 2.488–2.512 V at 25°C - centered at 50% of VCC for maximum signal swing and noise margin |
| Internal Bandwidth | 20 kHz - supports real-time position feedback in fast-moving mechanical systems |
| Chopping Frequency | 400 kHz - suppresses thermal and mechanical stress-induced offset drift |
| Output Clamp Range | 0.40–0.70 V (low), 4.35–4.65 V (high) - provides built-in short-circuit fault detection |
Pinout & Package
Package: 3-pin SOT-23W, surface-mount, 2.0 mm × 3.0 mm × 1.0 mm, lead-free with 100% matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Must be bypassed with 0.1 µF capacitor to GND; powers internal regulator and analog circuitry |
| VOUT | Analog output signal | Ratiometric voltage proportional to magnetic field; low-impedance, clamped, supports ≤10 nF load capacitance |
| GND | Ground reference | Return path for supply current and output sink/source; critical for noise immunity and offset stability |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line optimized QVO & sensitivity | Nonvolatile memory stores calibrated values, ensuring accuracy across full temperature range without external trimming |
| Programmable QVO temperature coefficient | Set at Allegro's test line for L-temp devices (150°C), reducing ∆VOUT(Q) drift to ≤±30 mV over –40°C to +150°C |
| High-bandwidth analog output | 20 kHz small-signal bandwidth enables responsive position tracking in servo and actuator loops |
| Undervoltage lockout (UVLO) | Hysteresis between 2.5 V (turn-off) and 3 V (turn-on) prevents erratic output during brown-out conditions |
| Output voltage clamps | Integrated high/low clamps provide diagnostic capability - output saturates predictably during wiring faults or shorts |
Applications
| Automotive Throttle Position Sensing | Industrial Motor Commutation |
|---|---|
Use Scenario: Detecting rotational angle of throttle plate in ICE powertrain systems under hood temperatures up to 150°C. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage output proportional to magnetic field from rotating ferrous target. Use Value: Eliminates need for external calibration due to factory-programmed QVO TC and sensitivity TC, reducing BOM and assembly cost. |
Use Scenario: Rotor position feedback in brushless DC motors used in HVAC blowers and industrial pumps. IC Role / Device Role / Timing Role: Analog magnetic field transducer feeding ADC input of motor controller for commutation timing. Use Value: 20 kHz bandwidth and chopper stabilization ensure accurate phase alignment even during rapid acceleration/deceleration. |
| Electric Power Steering (EPS) Torque Sensing | Factory Automation Linear Displacement Monitoring |
Use Scenario: Measuring torsion bar twist in EPS column assemblies where mechanical stress and thermal cycling degrade conventional sensors. IC Role / Device Role / Timing Role: High-stability linear Hall sensor capturing differential field changes across dual magnet configuration. Use Value: Precise recoverability after temperature cycling (±2% sensitivity hysteresis) ensures long-term zero-point integrity without recalibration. |
Use Scenario: Non-contact position feedback for hydraulic cylinder rods in packaging machinery operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Compact surface-mount analog sensor interfaced directly to PLC analog input module. Use Value: SOT-23W footprint enables PCB integration into tight spaces; ratiometric output eliminates need for precision voltage reference. |
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 |
|---|---|---|---|
| A1308LLHLX-3-T | Sensitivity 3.125 mV/G (vs. 5 mV/G); identical package, temp range, and architecture | Better suited for medium-field applications where higher output swing isn't required and lower noise floor is prioritized | Select when magnetic field strength is ≥300 G and system gain budget allows reduced sensitivity |
| A1309LLHLX-9-T | Sensitivity 9 mV/G; same L-temp rating (–40°C to 150°C), SOT-23W package, but higher gain and tighter initial tolerance | Optimized for low-field detection (e.g., proximity sensing) where resolution below 100 G is critical | Choose for ultra-high-resolution applications requiring >1.5× sensitivity; verify output headroom against 5 V supply |
Compared with A1308LLHLX-3-T and A1309LLHLX-9-T, the A1308LLHLX-5-T offers balanced sensitivity for mid-range field detection (100–600 G), optimal signal-to-noise ratio in constrained PCB layouts, and proven robustness in high-thermal-cycling automotive deployments.
Availability
A1308LLHLX-5-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial BLDC motor commutation, electric power steering torque sensing, and factory automation linear displacement monitoring requiring stable component supply across extended temperature ranges.
Supply support for A1308LLHLX-5-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 A1308 family was developed specifically for high-accuracy, miniature linear Hall-effect sensing in automotive and industrial motion control systems demanding extended temperature operation and factory-calibrated stability.
FAQ
What is the operating temperature range of the A1308LLHLX-5-T?
The A1308LLHLX-5-T is rated for –40°C to +150°C ambient operation, matching the SOT-23W "L" temperature grade. This range is validated per AEC-Q100 qualification and supports under-hood automotive use cases such as throttle and transmission position sensing where junction temperatures may exceed 125°C.
Does the A1308LLHLX-5-T require an external bypass capacitor?
Yes - the A1308LLHLX-5-T requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the pins. This capacitor stabilizes the internal regulator, reduces noise coupling, and ensures proper operation of the chopper-stabilized amplifier and dynamic offset cancellation circuitry within the A1308LLHLX-5-T.
How does the A1308LLHLX-5-T achieve stable quiescent output over temperature?
The A1308LLHLX-5-T achieves stable quiescent output by programming both the QVO temperature coefficient and sensitivity temperature coefficient during Allegro's end-of-line test at 150°C. This factory calibration compensates for intrinsic Hall element drift, resulting in ≤±30 mV QVO drift across –40°C to +150°C - a key performance differentiator of the A1308LLHLX-5-T.
Can the A1308LLHLX-5-T be used in reverse-polarity magnetic field detection?
No - the A1308LLHLX-5-T is a forward-polarity linear Hall-effect sensor with positive sensitivity (+5 mV/G). For reverse-polarity detection, Allegro offers the A1309LLHLX-RP9-T (–9 mV/G), which shares the same SOT-23W package and temperature range but is functionally distinct from the A1308LLHLX-5-T.
What is the purpose of the output voltage clamps in the A1308LLHLX-5-T?
The A1308LLHLX-5-T includes integrated output clamps (0.40–0.70 V low, 4.35–4.65 V high) to provide diagnostic capability during wiring faults. When VOUT is shorted to GND or VCC, the clamps saturate predictably - enabling host controllers to detect open-load, short-to-rail, or connector disconnection without adding external circuitry, a critical safety feature in the A1308LLHLX-5-T.
A1308LLHLX-5-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 2mA
- Resolution:
- -
- Bandwidth:
- -
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1308LLHLX-5-T FAQ
1.How can I place an order for A1308LLHLX-5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1308LLHLX-5-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 A1308LLHLX-5-T reliable?
The price and inventory of A1308LLHLX-5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1308LLHLX-5-T is usually 5 days.
3.What payment methods are accepted for A1308LLHLX-5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1308LLHLX-5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1308LLHLX-5-T?
A1308LLHLX-5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1308LLHLX-5-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 A1308LLHLX-5-T?
For technical support, including A1308LLHLX-5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1308LLHLX-5-T requirements.
6.How does Aetrix verify that A1308LLHLX-5-T is sourced from the original manufacturer or authorized distributors?
All A1308LLHLX-5-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 A1308LLHLX-5-T meets industry standards.
7.What is the process for return or replacement of A1308LLHLX-5-T?
All A1308LLHLX-5-T units undergo pre-shipment inspection (PSI). If there is an issue with A1308LLHLX-5-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 A1308LLHLX-5-T part is unused and in its original packaging.
Return procedure for A1308LLHLX-5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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