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Allegro MicroSystems A1356LKB-T
- Part No.:
- A1356LKB-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SIP
- Datasheet:
-
A1356LKB-T.pdf
- Description:
- SENSOR HALL EFFECT PWM 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,899
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Product details
Overview
A1356LKB-T from Allegro MicroSystems is a discontinued high-precision, programmable open-drain Hall-effect linear sensor IC with pulse-width modulated (PWM) output. It delivers magnetic field–proportional duty cycle output (40–60% quiescent range), operates from 4.5–18 V, supports –40°C to 150°C ambient, and features factory-programmed temperature compensation for sensitivity and quiescent duty cycle drift - used in automotive throttle position and industrial rotary encoder feedback systems.
For engineers reviewing the A1356LKB-T datasheet, A1356LKB-T pinout, A1356LKB-T application, or A1356LKB-T equivalent, key selection considerations include its 3-pin SIP (KB) package, end-of-line programmability of PWM carrier frequency (1.8–2.2 kHz), sensitivity (45–75 m%/G), and quiescent duty cycle (±0.35% D drift over temperature), plus open-drain output with short-circuit diagnostic clamping.
Technical Context
The A1356LKB-T integrates a Hall element, BiCMOS signal conditioning, chopper-stabilized offset cancellation (200 kHz chopping frequency), and PWM conversion circuitry. Its differential signal path and proprietary on-chip filters achieve ±3.0% linearity error and ±1.5% symmetry error across full temperature range.
Programming occurs via voltage-pulse sequences applied to the VCC pin (VP(LOW) = 5 V, VP(MID) = 15 V, VP(HIGH) = 27 V), supporting Try mode (temporary), Blow mode (fuse-based permanent programming), and Lock mode (full protection). The device uses dynamic offset cancellation to suppress thermal stress–induced drift and enables precise recoverability after temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Open-drain PWM with 5–95% clamp range and ±0.090% D jitter (3σ) |
| Supply Range | 4.5–18 V - supports wide automotive battery and industrial supply variations |
| Operating Temp | –40°C to 150°C - qualified for under-hood and motor-control environments |
| Quiescent Duty Cycle | Programmable 40–60% range with ±0.35% D max drift over temperature |
| Sensitivity Range | 45–75 m%/G, 8-bit programmability enabling fine-tuned magnetic response |
| Carrier Frequency | 1.8–2.2 kHz (4-bit programmable), ±140 Hz step size for timing-critical feedback |
| Internal Bandwidth | 400 Hz (–3 dB) - suitable for slow-to-moderate speed rotational sensing |
| Power-On Time | ≤4 ms - ensures rapid system readiness after cold start |
Pinout & Package
Package: 3-pin single inline package (SIP), lead (Pb)-free, 100% matte tin leadframe plating, KB suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Input power supply and programming interface | Accepts 4.5–18 V supply; also receives VP(LOW)/VP(MID)/VP(HIGH) pulses for register selection and fuse blowing |
| 2 - GND | Ground reference | Common return for supply, output, and internal biasing; requires low-inductance connection for noise immunity |
| 3 - PWMOUT | Open-drain PWM output | Sinks up to 60 mA; clamps at 90–95% (HIGH) and 5–10% (LOW) for fault detection; requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | 200 kHz chopping clock reduces residual Hall offset and thermal drift, enabling <±1% total output error over temperature |
| End-of-line programmability | VCC-pin pulse protocol allows final calibration after assembly - eliminates pre-mount trimming and improves BOM yield |
| PWM noise immunity | Digital PWM output provides >40 dB common-mode rejection vs. analog outputs, critical in high-EMI motor drive environments |
| Short-circuit diagnostics | Output duty cycle clamps (5–10% LOW / 90–95% HIGH) enable real-time wiring fault detection without additional circuitry |
| Temperature-compensated drift | Factory-programmed 0.03%/°C sensitivity TC and 0%/°C quiescent duty cycle TC minimize recalibration in thermal cycling applications |
| Calibration test mode | 50 ms automatic 49–51% duty cycle self-test at power-up verifies functional integrity before system initialization |
Applications
| Automotive Throttle Position Sensing | Industrial Rotary Encoder Feedback |
|---|---|
Use Scenario: Measures angular position of engine throttle plate via magnet attached to shaft rotation. IC Role / Device Role / Timing Role: Linear Hall sensor converting magnetic flux into proportional PWM duty cycle for ECU interpretation. Use Value: Factory-trimmed temperature coefficients ensure <±0.35% D quiescent drift over –40°C to 150°C, eliminating need for software compensation tables. | Use Scenario: Provides absolute angle feedback in servo motor position loops using ring magnet and PCB-mounted sensor. IC Role / Device Role / Timing Role: High-resolution magnetic field transducer delivering noise-immune digital PWM output synchronized to mechanical rotation. Use Value: 400 Hz bandwidth and ±3.0% linearity support accurate closed-loop control up to 24 rpm without aliasing or gain error. |
| Electric Power Steering (EPS) Torque Sensing | Industrial Hydraulic Valve Position Monitoring |
Use Scenario: Detects torsion bar twist in EPS column by measuring differential magnetic field between two magnets. IC Role / Device Role / Timing Role: Bipolar linear Hall sensor providing symmetric positive/negative field response with ±1.5% symmetry error. Use Value: Chopper-stabilized architecture ensures stable zero-point recovery after thermal shock, critical for ASIL-B functional safety compliance. | Use Scenario: Monitors spool displacement in proportional hydraulic valves using embedded magnet and linear Hall sensing. IC Role / Device Role / Timing Role: Robust magnetic transducer operating in oil-contaminated, vibration-prone environments with no moving contacts. Use Value: 150°C rated operation and mechanical stress resistance allow direct mounting on valve bodies without heat sinking or isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1324LUA-T | Analog ratiometric output (not PWM); fixed sensitivity (1.3 mV/G); no programmability; 3-pin SOT23 package | Lacks PWM noise immunity and end-of-line calibration; suited for cost-sensitive, low-EMI analog signal chains | Select when system already uses ADC-based signal acquisition and does not require fault diagnostics or field calibration. |
| ACS724LLCTR-20AU-T | Current sensor IC (not Hall-field sensor); 20 A range; bidirectional analog output; SOIC-8 package | Measures current, not magnetic field; incompatible pinout and signal chain; requires shunt-less current sensing topology | Choose only if application requires current measurement instead of position/angle; not a functional substitute for A1356LKB-T. |
Compared with A1356LKB-T, A1324LUA-T offers lower system cost but sacrifices noise immunity and programmability; ACS724LLCTR-20AU-T serves a fundamentally different measurement domain (current vs. field) and cannot replace A1356LKB-T in magnetic position sensing roles.
Availability
A1356LKB-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial rotary encoder feedback, electric power steering torque sensing, and hydraulic valve position monitoring requiring stable component supply despite end-of-life status.
Supply support for A1356LKB-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.
The A1356 product line was designed for high-accuracy, temperature-stable magnetic position and motion feedback in harsh environments - emphasizing programmability, chopper stabilization, and diagnostic-ready PWM output.
FAQ
Is A1356LKB-T still in production?
No, A1356LKB-T is a discontinued product. Allegro MicroSystems ceased production effective September 29, 2023. It should not be purchased for new design applications, and samples are no longer available. Aetrix Electronics maintains limited legacy stock with full traceability for existing production continuity support.
What is the function of the VCC pin on A1356LKB-T beyond power supply?
The VCC pin on A1356LKB-T serves dual functions: it supplies 4.5–18 V power and acts as the sole interface for programming. Voltage pulses (VP(LOW), VP(MID), VP(HIGH)) applied to VCC configure PWM carrier frequency, sensitivity, and quiescent duty cycle - enabling end-of-line calibration without additional programming hardware.
Can A1356LKB-T be used in safety-critical automotive systems?
A1356LKB-T incorporates features aligned with ASIL-B requirements - including chopper-stabilized offset cancellation, precise temperature drift control (<±0.35% D), and built-in diagnostics (duty cycle clamping). However, formal ASIL certification documentation is not published for A1356LKB-T; system-level validation per ISO 26262 remains the responsibility of the end customer.
What is the maximum sink current capability of the A1356LKB-T PWMOUT pin?
The A1356LKB-T PWMOUT pin supports a maximum sink current of 60 mA (typical) with internal current limiting. At 20 mA load, saturation voltage is ≤0.6 V; at 10 mA, it drops to ≤0.5 V. This allows direct interfacing with standard logic-level inputs or optocouplers without external drivers - provided external pull-up resistance is sized accordingly (e.g., 2 kΩ for 5 V logic).
Does A1356LKB-T support unipolar or bipolar magnetic field sensing?
A1356LKB-T supports both unipolar and bipolar magnetic field sensing. Its sensitivity specification covers both configurations: unipolar (D(BPOS) – D(Q))/BPOS and bipolar (D(BPOS) – D(BNEG))/(BPOS – BNEG). Symmetry error (±1.5%) applies only to bipolar use cases, while linearity error (±3.0%) is specified for both modes - confirmed in the A1356 datasheet Section 9, Characteristic Definitions.
A1356LKB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- PWM
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 18V
- Current - Supply (Max):
- 10mA
- Current - Output (Max):
- 25mA
- Resolution:
- -
- Bandwidth:
- 400Hz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable, Temperature Compensated
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1356LKB-T FAQ
1.How can I place an order for A1356LKB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1356LKB-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 A1356LKB-T reliable?
The price and inventory of A1356LKB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1356LKB-T is usually 5 days.
3.What payment methods are accepted for A1356LKB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1356LKB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1356LKB-T?
A1356LKB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1356LKB-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 A1356LKB-T?
For technical support, including A1356LKB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1356LKB-T requirements.
6.How does Aetrix verify that A1356LKB-T is sourced from the original manufacturer or authorized distributors?
All A1356LKB-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 A1356LKB-T meets industry standards.
7.What is the process for return or replacement of A1356LKB-T?
All A1356LKB-T units undergo pre-shipment inspection (PSI). If there is an issue with A1356LKB-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 A1356LKB-T part is unused and in its original packaging.
Return procedure for A1356LKB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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