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Allegro MicroSystems A1301KLHLX-T
- Part No.:
- A1301KLHLX-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1301KLHLX-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
A1301KLHLX-T from Allegro MicroSystems is a continuous-time, ratiometric, linear Hall-effect sensor IC optimized for accurate voltage output proportional to applied magnetic field. It delivers 2.5 mV/G typical sensitivity, 50% VCC quiescent output, and operates from –40°C to 125°C in a 3-pin SOT23W (LH) package. Used in industrial position sensing for linear and rotational motion where high-temperature stability and rail-to-rail analog output are required.
For engineers reviewing the A1301KLHLX-T datasheet, A1301KLHLX-T pinout, A1301KLHLX-T application, or A1301KLHLX-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The A1301KLHLX-T integrates a Hall element, linear amplifier, and CMOS Class A output stage on a single die, eliminating external signal conditioning for low-level analog magnetic sensing. Its ratiometric architecture ensures both quiescent output voltage (VOUTQ = 0.5 × VCC) and magnetic sensitivity remain proportional to supply voltage across operating conditions.
Internal end-of-line gain and offset trimming achieves ±2.5% linearity and ±3.0% symmetry over temperature, while fast 3–5 μs power-on time supports responsive motion detection. The device uses continuous-time sampling-no internal clock or digital conversion-making it immune to aliasing and suitable for analog feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G typical - enables precise analog position resolution down to ±0.4 G at 10 mV full-scale noise floor |
| Quiescent Output | 2.5 V @ VCC = 5 V - centered rail-to-rail output simplifies ADC interfacing and eliminates need for external biasing |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive and industrial motor control environments without derating |
| Supply Range | 4.5–6.0 V - compatible with standard 5 V logic rails and tolerant of battery droop in portable systems |
| Output Bandwidth | 20 kHz - supports real-time tracking of mechanical motion up to 3,180 RPM (for 1-pole target) |
| Power-On Time | 3–5 μs - allows rapid wake-up in duty-cycled sensing applications, reducing average system power |
| Noise (RMS) | 150 μV - enables sub-millimeter linear displacement resolution when paired with 12-bit ADC and low-pass filtering |
Pinout & Package
Package: 3-pin SOT23W (LH), surface-mount, Pb-free with 100% matte tin plating. Dimensions: 2.98 × 1.91 × 1.00 mm (L × W × H), branded face orientation defined per datasheet drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts 4.5–6.0 V; powers internal Hall element, amplifier, and output stage; bypass capacitor required at PCB level |
| VOUT (Pin 2) | Analog output terminal | CMOS Class A rail-to-rail output; sinks up to 10 mA; requires no pull-up; directly interfaces with SAR or sigma-delta ADC inputs |
| GND (Pin 3) | Reference ground | Common return for supply and output; must be connected to low-impedance system ground plane to maintain <±3% ratiometric accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric output | Both VOUTQ and sensitivity scale with VCC - eliminates calibration drift due to supply variation in unregulated 5 V systems |
| Factory-trimmed gain/offset | End-of-line laser trimming achieves ±2.5% linearity and ±3.0% symmetry - removes need for system-level calibration |
| Low-noise analog output | 150 μV RMS wideband noise - supports 12-bit effective resolution without oversampling or external filtering |
| Fast power-on response | 3–5 μs wake-up - enables microsecond-level motion event capture in burst-sensing architectures |
| High ESD robustness | Qualified to >4 kV HBM - survives handling and board assembly without additional protection circuitry |
Applications
| Brushless DC Motor Commutation | Linear Actuator Position Feedback |
|---|---|
|
Use Scenario: Detect rotor pole position in BLDC motors for electronic commutation without physical brushes. IC Role / Device Role / Timing Role: Analog angular position sensor providing continuous voltage output proportional to magnet angle relative to stator. Use Value: Enables smooth torque delivery and reduced acoustic noise vs. digital Hall latches; 20 kHz bandwidth supports >3,000 RPM operation. |
Use Scenario: Monitor extension/retraction of hydraulic or electric linear actuators in industrial automation. IC Role / Device Role / Timing Role: Linear displacement transducer converting magnet travel into proportional analog voltage for closed-loop control. Use Value: ±2.5% linearity and –40°C to 125°C operation ensure repeatable positioning accuracy across ambient extremes without recalibration. |
| Rotary Encoder Replacement | Valve Position Sensing |
|
Use Scenario: Replace optical or magnetic rotary encoders in cost-sensitive industrial controls requiring analog angle output. IC Role / Device Role / Timing Role: Continuous angular sensor delivering monotonic voltage vs. rotation for 0–360° measurement. Use Value: Ratiometric output maintains accuracy across 4.5–6.0 V supply range, eliminating need for precision voltage reference in encoder modules. |
Use Scenario: Monitor proportional valve stem position in pneumatic/hydraulic control systems for process regulation. IC Role / Device Role / Timing Role: Absolute linear position sensor mounted adjacent to moving ferrous core or permanent magnet. Use Value: 2.5 mV/G sensitivity and 150 μV noise enable sub-degree resolution in feedback loops controlling flow rate within ±0.5% setpoint accuracy. |
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-T | Higher sensitivity (5.0 mV/G), same LH package, but rated only to 85°C ambient | Limited to commercial-temperature applications; unsuitable for under-hood or high-temp industrial use | Select A1324LLHLT-T only if higher resolution is needed and ambient stays ≤85°C |
| MELEXIS MLX90242ESE-AAA-000-SP | Programmable sensitivity (1.0–10.0 mV/G), 3-pin SIP package, –40°C to 150°C rating | Requires I²C configuration; not drop-in; larger footprint than SOT23W; better for multi-sensitivity designs | Choose MLX90242ESE-AAA-000-SP when field-programmability or extended 150°C operation is required |
Compared with A1301KLHLX-T, A1324LLHLT-T trades temperature range for sensitivity, while MLX90242ESE-AAA-000-SP adds programmability and wider temperature capability at the cost of interface complexity and package size - neither is pin-compatible, but both serve overlapping linear sensing roles with distinct trade-offs.
Availability
A1301KLHLX-T is available at Aetrix Electronics and suitable for industrial motor control, hydraulic actuation, and high-temperature position sensing requiring stable component supply and long-term lifecycle support.
Supply support for A1301KLHLX-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 automotive and industrial markets since 1989.
The A1301 family was designed specifically for robust, analog-output position sensing in harsh environments - emphasizing ratiometric stability, wide temperature operation, and solid-state reliability over digital alternatives.
FAQ
What is the operating temperature range of the A1301KLHLX-T?
The A1301KLHLX-T is rated for an ambient operating temperature range of –40°C to 125°C. This K-grade qualification makes it suitable for under-hood automotive applications, industrial motor drives, and other high-temperature environments where standard E-grade sensors (–40°C to 85°C) would fail. The device maintains specified sensitivity and linearity across this full range without derating.
Does the A1301KLHLX-T require external calibration for accurate position sensing?
No, the A1301KLHLX-T does not require external calibration. It features factory-programmed end-of-line gain and offset trimming that achieves ±2.5% linearity and ±3.0% symmetry over temperature. Its ratiometric architecture also ensures quiescent output and sensitivity track supply voltage changes, eliminating drift-related recalibration in unregulated 5 V systems.
Can the A1301KLHLX-T be used with a 3.3 V supply?
No, the A1301KLHLX-T requires a minimum supply voltage of 4.5 V and is specified only for 4.5–6.0 V operation. Using 3.3 V will result in undefined behavior, including failure to power up correctly or deliver valid output. For 3.3 V systems, consider Allegro's A132x series or Melexis MLX902xx devices explicitly rated for lower supply rails.
What is the significance of the "LH" suffix in A1301KLHLX-T?
The "LH" suffix in A1301KLHLX-T denotes the 3-pin SOT23W surface-mount package. This compact, thermally efficient package measures 2.98 × 1.91 × 1.00 mm and is optimized for automated PCB assembly. The "X" in the suffix indicates tape-and-reel packaging (3,000 units per reel), while "T" confirms Pb-free construction with 100% matte tin plating.
How does the ratiometric output of the A1301KLHLX-T improve system accuracy?
The ratiometric output of the A1301KLHLX-T means both its quiescent output voltage (VOUTQ = 0.5 × VCC) and magnetic sensitivity scale proportionally with supply voltage. This eliminates errors caused by VCC drift or tolerance - for example, a ±5% change in VCC causes only ±3.0% error in output voltage, not the full ±5%. When paired with an ADC using the same VCC as its reference, ratiometry cancels supply-induced gain errors entirely.
A1301KLHLX-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 ~ 6V
- Current - Supply (Max):
- 11mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1301KLHLX-T FAQ
1.How can I place an order for A1301KLHLX-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1301KLHLX-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 A1301KLHLX-T reliable?
The price and inventory of A1301KLHLX-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1301KLHLX-T is usually 5 days.
3.What payment methods are accepted for A1301KLHLX-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1301KLHLX-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1301KLHLX-T?
A1301KLHLX-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1301KLHLX-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 A1301KLHLX-T?
For technical support, including A1301KLHLX-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1301KLHLX-T requirements.
6.How does Aetrix verify that A1301KLHLX-T is sourced from the original manufacturer or authorized distributors?
All A1301KLHLX-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 A1301KLHLX-T meets industry standards.
7.What is the process for return or replacement of A1301KLHLX-T?
All A1301KLHLX-T units undergo pre-shipment inspection (PSI). If there is an issue with A1301KLHLX-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 A1301KLHLX-T part is unused and in its original packaging.
Return procedure for A1301KLHLX-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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