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Allegro MicroSystems A1365LKTTN-5-T
- Part No.:
- A1365LKTTN-5-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP Module
- Datasheet:
-
A1365LKTTN-5-T.pdf
- Description:
- PROGRAMMABLE LINEAR CURRENT SENS
- Quantity:
- Payment:
- Shipping:
Inventory:2,739
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Product details
Overview
A1365LKTTN-5-T from Allegro MicroSystems is a programmable linear Hall-effect sensor IC designed for high-accuracy current sensing in automotive HEV inverters and DC–DC converters. It delivers ratiometric analog output (0.6–6.4 mV/G sensitivity range), 120 kHz bandwidth, ±1% total error over –40°C to 150°C, and integrated self-test diagnostics for functional safety compliance.
For engineers reviewing the A1365LKTTN-5-T datasheet, A1365LKTTN-5-T pinout, A1365LKTTN-5-T application, or A1365LKTTN-5-T equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, automotive-grade fault diagnostics, and confirmed alternative options for current-sensing system design.
Technical Context
The A1365LKTTN-5-T implements proprietary segmented linear temperature compensation (TC) to achieve ≤±2.5% sensitivity drift across –40°C to 150°C and near-zero quiescent voltage drift. Its chopper-stabilized BiCMOS architecture enables 120 kHz small-signal bandwidth with <3.7 µs response time and 1.1 mG/√Hz noise floor.
It integrates a 6-bit programmable window comparator for Over Field Fault detection, with 2-bit hysteresis control and latching/non-latching modes. Fault triggering is ratiometric (0.12×VCC to 0.28×VCC low threshold; 0.72×VCC to 0.88×VCC high threshold), and responds in <4.5 µs transiently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity Range | 2.9–6.4 mV/G - factory-programmed coarse setting (SENS_COARSE = 10) enabling optimal TC performance without post-manufacture drift risk |
| Bandwidth | 120 kHz - supports fast current transients in HEV motor control and high-frequency DC–DC switching |
| Operating Temp | –40°C to +150°C - qualified for under-hood automotive environments including inverter coolant loops |
| Total Error | ≤±1% typical - achieved via segmented TC and factory-trimmed offset/sensitivity, eliminating need for system-level calibration |
| Fault Response Time | <4.5 µs - enables real-time magnetic over-field shutdown before power device damage in IGBT/SiC gate drivers |
| Self-Test Mode | User-activated diagnostic verifying sensitivity integrity and Over Field Fault functionality per ISO 26262 ASIL-B requirements |
| Output Clamps | VCLP(HIGH) = 4.55–4.85 V, VCLP(LOW) = 0.15–0.45 V - provides short-circuit detection and ADC interface robustness |
Pinout & Package
Package: 4-pin SIP (Single Inline Package), 1 mm thickness, lead-free with 100% matte-tin plating - optimized for minimal air gap in current-sensing cores to maximize magnetic coupling efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power supply input and programming interface | Accepts 4.5–5.5 V; used with VOUT for Manchester-encoded EEPROM programming; includes UVLO (4.0–4.3 V enable threshold) |
| 2: VOUT | Analog output and programming interface | Ratiometric voltage output (quiescent ~2.5 V); clamped at 0.15–0.45 V / 4.55–4.85 V; supports 1 nF load capacitance |
| 3: FAULT | Digital fault flag output | Open-drain output with internal 10 kΩ pull-up; asserts low on magnetic over-field; supports latching mode and <4.5 µs response |
| 4: GND | Ground reference and broken-wire detection node | Internal open-circuit detection circuitry triggers fault if ground connection fails - critical for automotive functional safety |
Key Features
| Feature | Design Value |
|---|---|
| Segmented Linear Temperature Compensation | Reduces sensitivity drift to ≤±2.5% over full temperature range - eliminates need for external calibration in production systems |
| Programmable Over Field Fault Comparator | 6-bit threshold + 2-bit hysteresis allows precise magnetic trip point tuning for specific core saturation limits |
| Self-Test Diagnostic Mode | Verifies both sensitivity accuracy and fault path integrity at power-up - satisfies ASIL-B diagnostic coverage requirements |
| Ratiometric Output Architecture | Output scales with VCC; enables direct interface to microcontroller ADCs without external voltage references |
| Thin 1-mm SIP Package | Minimizes air gap in current-sensing toroids - improves magnetic coupling efficiency by up to 30% vs. thicker packages |
Applications
| HEV Inverter Phase Current Sensing | Automotive DC–DC Converter Input Current Monitoring |
|---|---|
Use Scenario: Real-time measurement of high-frequency phase currents in 400 V traction inverters with SiC MOSFETs switching at >20 kHz. IC Role / Device Role / Timing Role: Linear Hall sensor providing isolated, high-bandwidth analog feedback to gate driver control loop. Use Value: 120 kHz bandwidth captures switching harmonics; self-test ensures fault detection integrity during ISO 26262 FMEDA analysis. |
Use Scenario: Monitoring input current in 12 V–48 V bidirectional DC–DC converters for 48 V mild hybrid architectures. IC Role / Device Role / Timing Role: Ratiometric analog current sensor feeding MCU ADC for closed-loop regulation and overcurrent protection. Use Value: Factory-trimmed 2.9–6.4 mV/G sensitivity matches shunt-less design goals; output clamps prevent ADC saturation during load dump events. |
| Onboard Charger (OBC) Isolation Monitoring | Electric Power Steering (EPS) Motor Phase Sensing |
Use Scenario: Detecting leakage or insulation failure in high-voltage OBC primary-side current paths using differential Hall sensing. IC Role / Device Role / Timing Role: High-precision linear sensor with broken-ground-wire detection for redundant safety monitoring. Use Value: Open-circuit detection on GND pin provides independent fault channel; UVLO ensures operation only within valid supply range. |
Use Scenario: Compact, high-reliability current sensing in EPS motor windings where space constraints limit PCB area. IC Role / Device Role / Timing Role: Thin 1-mm SIP package enables mounting directly on motor stator laminations for minimal magnetic path length. Use Value: 1 mm profile reduces air gap by >40% vs. standard SOIC packages - increases signal-to-noise ratio by 12 dB in low-current regimes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall-effect current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724LLCTR-30AB-T | Fixed 30 A range, no programmability; 80 kHz bandwidth; no integrated fault comparator or self-test | Lacks Over Field Fault logic and diagnostic capability - requires external comparator and test firmware | Lower BOM cost for non-functional-safety designs; unsuitable for ASIL-B systems requiring hardware-based diagnostics |
| TLE4971-2K15M5XUMA1 | 15 mT range, 200 kHz bandwidth; SPI interface; no EEPROM-based trim; higher noise (2.5 mG/√Hz) | Requires external microcontroller for configuration; lacks ratiometric clamps and broken-wire detection | Better for high-speed digital interfaces; inferior for analog ADC integration and automotive ground-fault resilience |
Compared with ACS724LLCTR-30AB-T and TLE4971-2K15M5XUMA1, the A1365LKTTN-5-T uniquely combines factory-programmed TC stability, integrated fault logic with sub-5 µs response, and self-test capability - making it the only option qualified for ASIL-B HEV inverter current sensing without external support circuitry.
Availability
A1365LKTTN-5-T is available at Aetrix Electronics and suitable for HEV inverter phase sensing, automotive DC–DC converter current monitoring, and onboard charger isolation monitoring requiring stable component supply across extended temperature and long product lifecycles.
Supply support for A1365LKTTN-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 semiconductor company specializing in high-performance magnetic sensing and power ICs for automotive and industrial markets.
The A1365 product line was engineered specifically for high-reliability current sensing in electric vehicle power electronics, emphasizing temperature stability, functional safety diagnostics, and magnetic coupling efficiency in compact packaging.
FAQ
What is the factory-programmed sensitivity range for A1365LKTTN-5-T?
The A1365LKTTN-5-T is factory-programmed to the 2.9–6.4 mV/G sensitivity range (SENS_COARSE = 10). This coarse setting enables optimal temperature compensation performance - altering it risks exceeding the ±2.5% ΔSensTC specification across –40°C to 150°C. The device retains full 9-bit fine sensitivity programmability within this range.
Does A1365LKTTN-5-T support functional safety standards like ISO 26262?
Yes, the A1365LKTTN-5-T supports ISO 26262 ASIL-B through its user-activated Self-Test diagnostic mode (verifying sensitivity and Over Field Fault functionality), broken-ground-wire detection, undervoltage lockout, and output clamps. These features are implemented in hardware and do not require external microcontroller intervention to meet diagnostic coverage targets.
How is programming performed on A1365LKTTN-5-T?
Programming of A1365LKTTN-5-T is performed via Manchester-encoded serial communication using only VCC and VOUT pins - no dedicated programming interface required. Parameters including quiescent output voltage, fine sensitivity, fault thresholds, and hysteresis are written to volatile memory or locked into EEPROM (up to 100 write cycles).
What package type does A1365LKTTN-5-T use and why is it significant?
A1365LKTTN-5-T uses a 4-pin SIP (suffix KT) package, 1 mm thick with lead-free matte-tin plating. Its ultra-thin profile minimizes air gap in current-sensing magnetic cores - increasing magnetic coupling efficiency by up to 30% and improving signal-to-noise ratio in low-current applications compared to standard SOIC or TSSOP packages.
Can A1365LKTTN-5-T detect open-circuit faults on its ground connection?
Yes, A1365LKTTN-5-T includes dedicated broken-ground-wire detection circuitry. When the GND pin loses connection, the device drives VOUT to a defined high-voltage state (VBRK(HIGH) ≈ VCC) and asserts the FAULT pin - providing an independent hardware-level fault channel critical for automotive functional safety architectures.
A1365LKTTN-5-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 4-SSIP Module
- 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):
- 15mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 120kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable
- Supplier Device Package:
- 4-SIP
- Mounting Type:
- Through Hole
A1365LKTTN-5-T FAQ
1.How can I place an order for A1365LKTTN-5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1365LKTTN-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 A1365LKTTN-5-T reliable?
The price and inventory of A1365LKTTN-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 A1365LKTTN-5-T is usually 5 days.
3.What payment methods are accepted for A1365LKTTN-5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1365LKTTN-5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1365LKTTN-5-T?
A1365LKTTN-5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1365LKTTN-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 A1365LKTTN-5-T?
For technical support, including A1365LKTTN-5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1365LKTTN-5-T requirements.
6.How does Aetrix verify that A1365LKTTN-5-T is sourced from the original manufacturer or authorized distributors?
All A1365LKTTN-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 A1365LKTTN-5-T meets industry standards.
7.What is the process for return or replacement of A1365LKTTN-5-T?
All A1365LKTTN-5-T units undergo pre-shipment inspection (PSI). If there is an issue with A1365LKTTN-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 A1365LKTTN-5-T part is unused and in its original packaging.
Return procedure for A1365LKTTN-5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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