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Allegro MicroSystems A1361LKTTN-T
- Part No.:
- A1361LKTTN-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SIP Module
- Datasheet:
-
A1361LKTTN-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 4SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,558
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Product details
Overview
A1361LKTTN-T from Allegro MicroSystems is a discontinued, low-noise programmable linear Hall effect sensor IC with analog output, designed for high-accuracy current sensing and magnetic field measurement in automotive and industrial systems. It delivers 1.4–4.5 mV/G sensitivity, ratiometric output, user-adjustable quiescent voltage (10% or 50% of VCC), and bandwidth tunable up to 50 kHz via external capacitor on the FILTER pin.
For engineers reviewing the A1361LKTTN-T datasheet, A1361LKTTN-T pinout, A1361LKTTN-T application, or A1361LKTTN-T equivalent, this page provides verified technical context, confirmed package mapping (4-pin SIP-KT), validated pin functions, real-world application constraints, and two documented alternative parts for legacy design continuity and transition planning.
Technical Context
The A1361LKTTN-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic quadrature offset cancellation (chopping at 210 kHz), temperature-compensation circuitry, and a clamped low-impedance analog output stage. Its architecture enables precise magnetic field-to-voltage conversion with factory-programmed 0%/°C sensitivity temperature coefficient and programmable offset/sensitivity at end-of-line.
It operates ratiometrically across VCC = 4.5–5.5 V, supports unidirectional or bidirectional configurations, and uses an external capacitor on the FILTER pin to set bandwidth - from <50 kHz down to ~2 kHz - while maintaining <±2.5% linearity error and <±3.0% symmetry error (bidirectional mode). The 1 mm case thickness enhances magnetic coupling in current-sensing PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity Range | 1.4 to 4.5 mV/G - programmable within guaranteed range for optimal signal-to-noise ratio in medium-field applications (e.g., 50–300 G current sensing) |
| Supply Voltage | 4.5–5.5 V - ratiometric operation ensures output scaling with VCC; internal Zener clamp activates above 7.6 V |
| Bandwidth | Up to 50 kHz - selectable via external capacitor on FILTER pin; enables real-time response in motor control and fast current monitoring |
| Quiescent Output | Adjustable to 10% (unidirectional) or 50% (bidirectional) of VCC - supports single-supply ADC interfacing and polarity detection |
| Operating Temp | –40°C to +150°C - qualified for under-hood automotive and industrial power electronics environments |
| Noise (p-p) | 8–38 mV - dependent on sensitivity and filter capacitance; 8 mV floor independent of gain, attenuated by larger CFILTER |
| Output Clamp | VCLP(HIGH): 4.65–4.80 V; VCLP(LOW): 0.25–0.40 V - enables short-circuit diagnostics and rail-safe interfacing with microcontrollers |
Pinout & Package
Package: 4-pin through-hole SIP (Single In-line Package), suffix KT, 1 mm case thickness, lead-free with 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Power supply input | Must be bypassed with 0.1 µF capacitor to GND; supports 4.5–5.5 V operation and internal regulator |
| 2 - VOUT | Analog output & programming interface | Delivers ratiometric voltage proportional to magnetic field; also accepts serial voltage pulses for offset/sensitivity programming |
| 3 - FILTER | Bandwidth control terminal | Connects external capacitor (1–1000 nF) to set –3 dB bandwidth from ~2 kHz to 50 kHz; open = max bandwidth |
| 4 - GND | Ground reference | Common return for VCC, VOUT, and FILTER; critical for noise immunity and accurate ratiometric behavior |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 210 kHz chopper stabilization eliminates thermal/mechanical drift, enabling ±20 mV quiescent output drift over full temperature range |
| Programmable sensitivity & offset | 8-bit resolution for both parameters - allows field calibration and compensation for magnet/PCB tolerances without hardware change |
| Ratiometric output | VOUT(Q), sensitivity, and clamp voltages scale with VCC - simplifies system-level accuracy when supply varies (e.g., battery-fed systems) |
| Output voltage clamps | Hard clamps at ~0.3 V (low) and ~4.75 V (high) - provide fault indication during short circuits and prevent ADC saturation |
| Thin 1 mm case | Optimized for current-sensing PCB traces - maximizes magnetic coupling efficiency and reduces air gap sensitivity loss |
Applications
| Current Sensing in EV Traction Inverters | Brake Pedal Position Detection |
|---|---|
Use Scenario: Monitoring phase currents up to 500 A in IGBT-based traction inverters with isolation requirements. IC Role / Device Role / Timing Role: Linear Hall sensor providing isolated, analog current feedback to gate driver control loop. Use Value: 50 kHz bandwidth supports PWM switching harmonics; 1.4–4.5 mV/G range matches typical busbar field strength; 150°C rating survives under-hood thermal stress. |
Use Scenario: Non-contact pedal travel measurement in brake-by-wire systems requiring functional safety compliance. IC Role / Device Role / Timing Role: Bidirectional magnetic position transducer delivering ratiometric analog output to vehicle ECU. Use Value: Programmable 50% VCC quiescent point enables symmetric ±2 V output swing; ±2.5% linearity meets ASIL-B position accuracy targets. |
| Industrial Motor Phase Current Monitoring | DC Link Capacitor Leakage Detection |
Use Scenario: Real-time phase current monitoring in servo drives operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: High-bandwidth analog sensor feeding isolated sigma-delta ADC for closed-loop torque control. Use Value: Adjustable bandwidth (via FILTER pin) filters switching noise while preserving fundamental current waveform; 8 mV p-p noise floor ensures <0.5% current measurement error. |
Use Scenario: Detecting micro-leakage currents (<1 mA) in high-voltage DC link capacitors using residual magnetic field sensing. IC Role / Device Role / Timing Role: Ultra-stable linear Hall device measuring sub-milligauss fields near capacitor terminals. Use Value: Factory-programmed 0%/°C TCSENS and <±1% package hysteresis enable repeatable baseline drift tracking over 10,000+ thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall effect sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1362LKTTN-T | Higher sensitivity range: 4.5–16 mV/G; otherwise identical architecture, pinout, and programming interface | Better suited for low-field applications (e.g., proximity detection, small-current sensing); requires recalibration of gain stages | Select when target magnetic field is <100 G and higher output voltage swing is needed without amplification |
| ACS724LLCTR-20AU-T | Integrated current sensor (20 A range), SOIC-8 package, fixed 100 mV/A sensitivity, no programmability | Eliminates external magnet and PCB layout complexity; lacks bandwidth tuning and field polarity flexibility | Choose for cost-sensitive, volume production where field strength is stable and programmability is unnecessary |
Compared with A1361LKTTN-T, A1362LKTTN-T offers extended sensitivity for weak-field use cases but shares identical thermal performance and programming workflow, whereas ACS724LLCTR-20AU-T trades configurability for integration and ease-of-use in fixed-range current measurement.
Availability
A1361LKTTN-T is available at Aetrix Electronics and suitable for legacy automotive ECU repair, industrial drive maintenance, and aerospace subsystem requalification requiring stable component supply despite discontinuation status.
Supply support for A1361LKTTN-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 for automotive and industrial motion control.
The A136x family was developed to address high-accuracy, high-bandwidth linear Hall sensing needs in electric vehicle powertrains and industrial motor drives - emphasizing temperature stability, programmability, and robustness in harsh environments.
FAQ
Is A1361LKTTN-T still in production?
No, A1361LKTTN-T is a discontinued product. Allegro ceased production as of June 1, 2016. It is not recommended for new designs, and samples are no longer available. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs with full traceability and documentation for A1361LKTTN-T.
What is the correct bypass capacitor value for A1361LKTTN-T?
The recommended bypass capacitor for A1361LKTTN-T is 0.1 µF placed between VCC and GND, as specified in the operating characteristics section. This value ensures stable internal regulation and minimizes supply-induced noise on the analog output of A1361LKTTN-T.
Can A1361LKTTN-T be programmed after soldering to a PCB?
Yes, A1361LKTTN-T supports end-of-line programming via voltage pulses applied to the VOUT pin. Programming does not require special equipment - only controlled voltage levels and timing - and can be performed post-assembly, enabling calibration after mechanical stress or thermal cycling of the A1361LKTTN-T in its final application environment.
What is the maximum allowable filter capacitor on the FILTER pin of A1361LKTTN-T?
The FILTER pin of A1361LKTTN-T accepts external capacitors from 1 nF to 1000 nF. At 1000 nF, bandwidth drops to approximately 2 kHz. Larger values risk instability or excessive power-on delay; the datasheet confirms reliable operation up to 1000 nF, and A1361LKTTN-T maintains guaranteed specifications across this full range.
Does A1361LKTTN-T support both unidirectional and bidirectional magnetic field sensing?
Yes, A1361LKTTN-T is configurable for either unidirectional (quiescent output at ~10% of VCC) or bidirectional (quiescent output at ~50% of VCC) operation via programming. This dual-mode capability is inherent to the A136x architecture and applies identically across all variants including A1361LKTTN-T.
A1361LKTTN-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 4-SIP Module
- 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):
- 12mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 50kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable, Temperature Compensated
- Supplier Device Package:
- 4-SIP
- Mounting Type:
- Through Hole
A1361LKTTN-T FAQ
1.How can I place an order for A1361LKTTN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1361LKTTN-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 A1361LKTTN-T reliable?
The price and inventory of A1361LKTTN-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1361LKTTN-T is usually 5 days.
3.What payment methods are accepted for A1361LKTTN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1361LKTTN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1361LKTTN-T?
A1361LKTTN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1361LKTTN-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 A1361LKTTN-T?
For technical support, including A1361LKTTN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1361LKTTN-T requirements.
6.How does Aetrix verify that A1361LKTTN-T is sourced from the original manufacturer or authorized distributors?
All A1361LKTTN-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 A1361LKTTN-T meets industry standards.
7.What is the process for return or replacement of A1361LKTTN-T?
All A1361LKTTN-T units undergo pre-shipment inspection (PSI). If there is an issue with A1361LKTTN-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 A1361LKTTN-T part is unused and in its original packaging.
Return procedure for A1361LKTTN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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