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Home > Products > Sensors, Transducers > Magnetic Sensors > Linear, Compass (ICs)

Allegro MicroSystems A1373LKB

Name: A1373LKB
Brand: Allegro MicroSystems
SKU: A1373LKB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1373LKB

Manufacturer:: Allegro MicroSystems

Category:: Linear, Compass (ICs)

Package:: 3-SIP

Datasheet:: A1373LKB.pdf

Description:: SENSOR HALL EFFECT ANALOG 3SIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A1373LKB from Allegro MicroSystems is a discontinued high-precision, output-pin-programmable linear Hall effect sensor IC designed for automotive and industrial position-sensing applications. It features chopper-stabilized architecture (200 kHz clock), programmable quiescent output voltage (0.7–4.5 V), sensitivity (1.75–11.25 mV/G), temperature coefficient (±0.016 to ±0.104 %/°C), and rail-to-rail or clamped output operation - enabling precise analog magnetic field measurement in throttle, pedal, and suspension height sensors.

For engineers reviewing the A1373LKB datasheet, A1373LKB pinout, A1373LKB application, or A1373LKB equivalent, this page delivers verified technical context, confirmed package mapping (3-pin SIP KB), validated programming parameters, real-world application integration constraints, and two documented alternative parts with explicit functional and thermal-range differences.

Technical Context

The A1373LKB implements dynamic offset cancellation via a 200 kHz chopper-stabilized Hall element and sample-and-hold demodulation, achieving <±40 mV quiescent output drift over –40°C to +150°C. Its on-chip regulator provides EMI robustness and over/under-voltage protection while supporting ratiometric operation (±0.25% V_OUT(Q), ±1.0% sensitivity).

Programming occurs via serial voltage pulses applied to the V_OUT pin: coarse/fine gain (2+9 bits), quiescent voltage (2+9 bits), polarity (1 bit), clamp level (10%/20%/none), and sensitivity temperature coefficient (5 bits). One-time locking is achieved by blowing internal fuses at 25–27 V, with no PCB changes required for field calibration.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Temperature	–40°C to +150°C (Range L); enables under-hood automotive use without external thermal derating
Supply Voltage	4.5–5.5 V; ratiometric output ensures stable scaling across supply variation
Chopping Frequency	200 kHz; enables high-frequency signal processing and low-drift performance
Internal Bandwidth	2.5 kHz (A1373); supports dynamic position sensing up to ~400 Hz mechanical input
Noise (peak-to-peak)	6–16 mV (A1373); defines minimum resolvable magnetic field change (~4.6–12.2 G)
Output Sink Current	10 mA; sufficient to drive 4.7 kΩ load with <0.25 V dropout at low output
Quiescent Output Drift	±40 mV (V_OUT(Q) = LOW/MID), ±55 mV (HIGH); sets absolute accuracy limit over full temp range

Pinout & Package

Package: 3-pin single inline package (SIP), KB suffix, wide lead spacing, Pb-free matte tin plating.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (GND)	Ground reference	Return path for supply current and output sink; must be low-impedance for noise immunity
Pin 2 (V_OUT)	Programmable analog output / programming interface	Delivers linear Hall voltage (0.7–4.5 V) and accepts 25–27 V programming pulses for fuse-blowing
Pin 3 (V_CC)	Regulated power input	Accepts 4.5–5.5 V; internal regulator provides EMI filtering and over/under-voltage protection

Key Features

Feature	Design Value
Output pin programming	Enables full configuration (gain, offset, TC, clamp, polarity) without dedicated programming hardware - only V_OUT pulse train required
Chopper-stabilized architecture	Reduces offset drift to <±40 mV over –40°C to +150°C, eliminating need for external calibration
Ratiometric output	Ensures V_OUT(Q), sensitivity, and clamp voltages scale linearly with V_CC (±0.25% error), simplifying ADC reference design
Selectable output clamping	Configurable 10% or 20% high/low clamps (e.g., 0.4–0.6 V low clamp) prevent saturation in noisy magnetic environments
One-time programmable lock	Blows internal fuses after final configuration, preventing accidental reprogramming in production assembly

Applications

Throttle Position Sensing	Pedal Position Sensing
Use Scenario: Non-contact measurement of engine throttle plate angle in gasoline direct injection systems. IC Role / Device Role / Timing Role: Linear Hall sensor converting magnetic flux from rotating ferrous target into analog voltage proportional to angular position. Use Value: Eliminates potentiometer wear and contact bounce; ±0.5% linearity and ±40 mV V_OUT(Q) drift ensure repeatable idle-to-WOT mapping over 150°C under-hood operation.	Use Scenario: Detection of accelerator pedal displacement in brake-by-wire and electronic throttle control systems. IC Role / Device Role / Timing Role: Analog magnetic position transducer providing continuous feedback to ECU with fail-safe diagnostics. Use Value: Programmable quiescent voltage (0.7–4.5 V) allows unipolar/bipolar operation matching OEM signal conditioning; ratiometric output maintains accuracy across battery voltage fluctuations.
Suspension Height Sensing	Industrial Linear Actuator Feedback
Use Scenario: Monitoring ride height in adaptive air suspension systems using magnet-on-spring configurations. IC Role / Device Role / Timing Role: High-stability linear Hall device measuring axial displacement of magnet attached to suspension linkage. Use Value: 2.5 kHz bandwidth and <16 mV peak-to-peak noise enable sub-millimeter resolution; wide temp range avoids recalibration during cold-soak or hot-soak cycles.	Use Scenario: Closed-loop position control of hydraulic/pneumatic cylinders in factory automation equipment. IC Role / Device Role / Timing Role: Field-programmable analog sensor calibrated per actuator stroke length and magnetic circuit geometry. Use Value: Output pin programming allows end-of-line trim for gain (1.75–11.25 mV/G) and offset, reducing manufacturing tolerance stack-up and eliminating post-assembly calibration fixtures.

Throttle Position Sensing

Pedal Position Sensing

Use Scenario: Non-contact measurement of engine throttle plate angle in gasoline direct injection systems.

IC Role / Device Role / Timing Role: Linear Hall sensor converting magnetic flux from rotating ferrous target into analog voltage proportional to angular position.

Use Value: Eliminates potentiometer wear and contact bounce; ±0.5% linearity and ±40 mV V_OUT(Q) drift ensure repeatable idle-to-WOT mapping over 150°C under-hood operation.

Use Scenario: Detection of accelerator pedal displacement in brake-by-wire and electronic throttle control systems.

IC Role / Device Role / Timing Role: Analog magnetic position transducer providing continuous feedback to ECU with fail-safe diagnostics.

Use Value: Programmable quiescent voltage (0.7–4.5 V) allows unipolar/bipolar operation matching OEM signal conditioning; ratiometric output maintains accuracy across battery voltage fluctuations.

Suspension Height Sensing

Industrial Linear Actuator Feedback

Use Scenario: Monitoring ride height in adaptive air suspension systems using magnet-on-spring configurations.

IC Role / Device Role / Timing Role: High-stability linear Hall device measuring axial displacement of magnet attached to suspension linkage.

Use Value: 2.5 kHz bandwidth and <16 mV peak-to-peak noise enable sub-millimeter resolution; wide temp range avoids recalibration during cold-soak or hot-soak cycles.

Use Scenario: Closed-loop position control of hydraulic/pneumatic cylinders in factory automation equipment.

IC Role / Device Role / Timing Role: Field-programmable analog sensor calibrated per actuator stroke length and magnetic circuit geometry.

Use Value: Output pin programming allows end-of-line trim for gain (1.75–11.25 mV/G) and offset, reducing manufacturing tolerance stack-up and eliminating post-assembly calibration fixtures.

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
A1373EKB–T	Identical functionality and pinout; rated for –40°C to +85°C (Range E) instead of –40°C to +150°C (Range L)	Not suitable for under-hood automotive locations exceeding 85°C ambient; acceptable for cabin or industrial control panels	Select when operating temperature remains ≤85°C and cost optimization is prioritized over extended thermal margin
ACS724LLCTR-20AU-T	Integrated current sensor (20 A range), not field-programmable; fixed 100 mV/A output, ±1.5% total error, –40°C to +150°C	Designed for current sensing, not position sensing; lacks magnetic gain/offset/TC programming capability	Choose only if application requires current measurement rather than magnetic field position detection

Compared with A1373LKB, A1373EKB–T offers identical programmability but reduced thermal rating, while ACS724LLCTR-20AU-T serves a fundamentally different measurement domain (current vs. position) with no field-programming capability - neither is a drop-in replacement, but both address adjacent sensing needs in automotive and industrial systems.

Availability

A1373LKB is available at Aetrix Electronics and suitable for automotive throttle sensing, industrial actuator feedback, and suspension height monitoring requiring stable component supply despite end-of-life status.

Supply support for A1373LKB 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 designs high-performance magnetic sensing and power ICs for automotive safety, electrification, and industrial motion control markets.

The A1373LKB belongs to Allegro's high-precision linear Hall effect sensor family, engineered specifically for non-contact position sensing in harsh thermal environments where reliability and programmability outweigh cost sensitivity.

FAQ

What is the operating temperature range of the A1373LKB?

The A1373LKB is rated for –40°C to +150°C (Range L), making it suitable for under-hood automotive applications such as throttle and suspension sensors where ambient temperatures exceed 85°C. This extended range is confirmed in the Selection Guide table and Absolute Maximum Ratings section of the official datasheet.

Is the A1373LKB still in production?

No, the A1373LKB is a discontinued product. The datasheet explicitly states "These devices are no longer in production. The devices should not be purchased for new design applications. Samples are no longer available." Aetrix Electronics provides legacy supply support, but new designs should consider alternatives.

How is the A1373LKB programmed, and what parameters can be configured?

The A1373LKB is programmed via voltage pulses applied to the V_OUT pin: coarse/fine gain (2+9 bits), quiescent output voltage (2+9 bits), sensitivity temperature coefficient (5 bits), output clamp level (10%/20%/none), and polarity (1 bit). Programming uses 25–27 V pulses to blow internal fuses, with permanent locking enabled after final configuration.

What is the difference between A1373LKB and A1373EKB–T?

The A1373LKB and A1373EKB–T share identical functionality, pinout, and programming interface. Their sole difference is operating temperature range: A1373LKB supports –40°C to +150°C (Range L), while A1373EKB–T is limited to –40°C to +85°C (Range E). Both use the same KB package and 3-pin SIP footprint.

Does the A1373LKB support ratiometric output, and why does it matter?

Yes, the A1373LKB provides ratiometric output: its quiescent voltage (±0.25%), sensitivity (±1.0%), and clamp voltage (±1.5%) all scale linearly with V_CC. This eliminates errors caused by supply voltage variation and simplifies system-level ADC design, as the same reference can be used for both sensor supply and analog-to-digital conversion.

A1373LKB Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

Product Status:: Obsolete

Technology:: Hall Effect

Axis:: Single

Output Type:: Analog Voltage

Sensing Range:: -

Voltage - Supply:: 4.5V ~ 5.5V

Current - Supply (Max):: 10mA

Current - Output (Max):: 10mA

Resolution:: -

Bandwidth:: 2.5kHz

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Features:: Programmable

Supplier Device Package:: 3-SIP

Mounting Type:: Through Hole

A1373LKB FAQ

1.How can I place an order for A1373LKB through Aetrix?

Please submit a Request for Quotation (RFQ) for A1373LKB 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 A1373LKB reliable?

The price and inventory of A1373LKB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1373LKB is usually 5 days.

3.What payment methods are accepted for A1373LKB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1373LKB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1373LKB?

A1373LKB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1373LKB 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 A1373LKB?

For technical support, including A1373LKB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1373LKB requirements.

6.How does Aetrix verify that A1373LKB is sourced from the original manufacturer or authorized distributors?

All A1373LKB 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 A1373LKB meets industry standards.

7.What is the process for return or replacement of A1373LKB?

All A1373LKB units undergo pre-shipment inspection (PSI). If there is an issue with A1373LKB, 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 A1373LKB part is unused and in its original packaging.

Return procedure for A1373LKB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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