My Inquiry
My Account
Allegro MicroSystems A1365LKTTN-1-T
- Part No.:
- A1365LKTTN-1-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP Module
- Datasheet:
-
A1365LKTTN-1-T.pdf
- Description:
- PROGRAMMABLE LINEAR CURRENT SENS
- Quantity:
- Payment:
- Shipping:
Inventory:4,765
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A1365LKTTN-1-T from Allegro MicroSystems is a low-noise, high-precision, programmable linear Hall-effect sensor IC designed for high-bandwidth current sensing in automotive HEV inverters and DC–DC converters. It delivers ratiometric analog output (0.6–1.3 mV/G sensitivity range), 120 kHz bandwidth, ±1% total accuracy over –40°C to +150°C, and integrated self-test diagnostics with <4.5 µs fault response.
For engineers reviewing the A1365LKTTN-1-T datasheet, A1365LKTTN-1-T pinout, A1365LKTTN-1-T application, or A1365LKTTN-1-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional differences.
Technical Context
The A1365LKTTN-1-T implements proprietary segmented linear temperature compensation (TC) to achieve ≤±1% total error across –40°C to +150°C, with factory-trimmed TCSENS = 0%/°C and ΔSensTC ≤ ±2.5%. Its chopper-stabilized BiCMOS architecture integrates dynamic offset cancellation, a high-gain low-noise amplifier, and clamped low-impedance output stage.
It features a 6-bit programmable window comparator for Over Field Fault detection (0.12×VCC to 0.28×VCC low threshold, 0.72×VCC to 0.88×VCC high threshold), 2-bit hysteresis control (0–120 mV), latching/non-latching mode selection, and user-activated self-test verifying sensitivity and fault functionality - all critical for ASIL-B functional safety compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 120 kHz small-signal –3 dB; enables accurate sensing of fast-switching currents in SiC/GaN-based HEV inverters. |
| Sensitivity Range | 0.6–1.3 mV/G (coarse setting 00); optimized for high-accuracy, low-drift current measurement at low field strengths. |
| Quiescent Output | Programmable 2.3–2.7 V (9-bit resolution); ratiometric to VCC, enabling direct interface with 5 V ADCs without scaling. |
| Fault Response Time | <4.5 µs transient response; supports rapid shutdown in over-current or short-circuit events in power electronics. |
| Operating Temp | –40°C to +150°C ambient; qualified for under-hood automotive applications including traction inverters and on-board chargers. |
| Supply Voltage | 4.5–5.5 V; includes undervoltage lockout (UVLO) with 4.0 V enable / 3.2 V disable thresholds for robust system startup. |
| Output Noise | 1.1 mG/√Hz; enables sub-milligauss resolution for high-fidelity closed-loop current control loops. |
Pinout & Package
Package: 4-pin SIP (Single Inline Package), 1 mm thickness, lead-free with 100% matte-tin plating (suffix KT/TN). Thin profile improves magnetic coupling in current-sensing core assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power supply input and programming channel | Supplies internal circuitry; also used for Manchester-encoded EEPROM programming via voltage modulation. |
| 2: VOUT | Analog output and programming channel | Delivers ratiometric voltage proportional to magnetic field; doubles as bidirectional serial data line for coarse/fine trim programming. |
| 3: FAULT | Digital fault flag output | Open-drain output asserting low on over-field condition; supports external pull-up to 1.65–5.5 V with internal 10 kΩ pull-up option. |
| 4: GND | Reference ground and broken-wire detection node | Ground return path; open-circuit detection triggers FAULT assertion and disables output to prevent false readings. |
Key Features
| Feature | Design Value |
|---|---|
| Segmented linear TC | Factory-programmed per-device compensation achieving ≤±1% full-range accuracy without external calibration. |
| Self-test diagnostic mode | Verifies sensitivity integrity and FAULT comparator operation at power-up - meets ISO 26262 ASIL-B diagnostic coverage requirements. |
| 6-bit programmable fault thresholds | Enables precise magnetic field trip points (e.g., 120–440 G at 5 V) tailored to specific busbar geometry and current rating. |
| Ratiometric output clamps | VCLP(HIGH) = 4.55–4.85 V and VCLP(LOW) = 0.15–0.45 V scale with VCC, simplifying fault detection in variable-supply systems. |
| Broken ground wire detection | Monitors GND pin continuity; asserts FAULT and forces VOUT to known state if open - eliminates single-point failure risk. |
Applications
| HEV Traction Inverter Current Sensing | Automotive DC–DC Converter Feedback |
|---|---|
Use Scenario: Real-time phase current monitoring in 400–800 V battery-fed inverters driving permanent magnet motors. IC Role / Device Role / Timing Role: High-bandwidth analog current transducer with integrated fault flag for IGBT gate driver interlock. Use Value: 120 kHz bandwidth captures fast di/dt during switching transitions; self-test ensures functional safety before torque command execution. |
Use Scenario: Primary-side current feedback in isolated 12 V/48 V bi-directional DC–DC converters for 48 V mild hybrid systems. IC Role / Device Role / Timing Role: Ratiometric Hall sensor providing isolated current signal to controller ADC with built-in UVLO and open-ground protection. Use Value: Programmable quiescent output (2.3–2.7 V) aligns with mid-scale ADC reference; fault clamps simplify over-current detection logic. |
| On-Board Charger (OBC) Input Monitoring | Electric Power Steering (EPS) Motor Phase Sensing |
Use Scenario: AC input current sensing in 6.6 kW OBCs using PFC boost stages with SiC MOSFETs. IC Role / Device Role / Timing Role: High-accuracy linear Hall sensor interfacing directly to MCU ADC with minimal external components. Use Value: 1.1 mG/√Hz noise floor enables precise RMS current calculation; thin SIP package fits constrained PCB space near busbars. |
Use Scenario: Low-latency motor phase current sensing in EPS systems requiring <10 µs fault response for torque limiting. IC Role / Device Role / Timing Role: Fast-response Hall-effect current sensor feeding closed-loop FOC algorithm with integrated over-field latch. Use Value: <4.5 µs FAULT assertion time enables hardware-level torque cut within 1 PWM cycle; –40°C to +150°C rating supports under-hood mounting. |
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-10AU-T | Fixed 10 A range, 80 kHz bandwidth, no programmable fault comparator or self-test; SOIC-8 package. | Lacks ASIL-B diagnostic capability; suitable for cost-sensitive non-safety-critical applications only. | Select when functional safety certification is not required and board space permits SOIC-8 footprint. |
| TLE4972-2K15M5HALLAUMA1 | 15 mT range, 200 kHz bandwidth, integrated EEPROM, but no broken-wire detection or ratiometric clamps. | Higher bandwidth but lacks open-ground fault detection - requires external circuitry for full fault coverage. | Select for ultra-high-speed sensing where GND continuity monitoring is handled externally or redundantly. |
Compared with ACS724LLCTR-10AU-T and TLE4972-2K15M5HALLAUMA1, the A1365LKTTN-1-T uniquely combines programmable fault thresholds, self-test diagnostics, broken-wire detection, and ratiometric clamps in a thin SIP package - making it the only choice for ASIL-B-compliant HEV inverter current sensing where PCB height and functional safety coexist.
Availability
A1365LKTTN-1-T is available at Aetrix Electronics and suitable for automotive HEV inverters, on-board chargers, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A1365LKTTN-1-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, industrial, and green energy applications.
The A1365 product line was engineered specifically for high-reliability current sensing in electrified vehicle powertrains, emphasizing functional safety, temperature stability, and programmability in compact through-hole packages.
FAQ
What is the sensitivity range of the A1365LKTTN-1-T, and how is it programmed?
The A1365LKTTN-1-T has a factory-set coarse sensitivity range of 0.6–1.3 mV/G (coarse bits = 00), with fine adjustment via 9-bit programming yielding step sizes of ~3.2 µV/G. Programming is performed via Manchester-encoded signals on VCC and VOUT pins - no external programmer required. The A1365LKTTN-1-T retains settings in EEPROM with up to 100 write cycles.
Does the A1365LKTTN-1-T support functional safety standards like ISO 26262?
Yes - the A1365LKTTN-1-T includes user-activated self-test diagnostics that verify sensitivity integrity and Over Field Fault comparator operation at power-up, supporting ASIL-B compliance. Its broken-wire detection, UVLO, output clamps, and latched fault mode collectively meet diagnostic coverage requirements for automotive safety-related current sensing. The A1365LKTTN-1-T is qualified to AEC-Q100 Grade 0.
What is the purpose of the FAULT pin on the A1365LKTTN-1-T, and how is it configured?
The FAULT pin is an open-drain digital flag asserting low when magnetic field exceeds programmable positive or negative thresholds. It supports 6-bit threshold selection (0.12×VCC to 0.28×VCC and 0.72×VCC to 0.88×VCC), 2-bit hysteresis (0–120 mV), and latching/non-latching behavior - all configurable via EEPROM. The A1365LKTTN-1-T's FAULT response time is <4.5 µs, enabling hardware-triggered shutdown in power electronics.
How does the A1365LKTTN-1-T handle temperature drift, and what is its accuracy specification?
The A1365LKTTN-1-T uses proprietary segmented linear temperature compensation, achieving ≤±1% total error over –40°C to +150°C. Factory programming yields TCSENS = 0%/°C and ΔSensTC ≤ ±2.5%, while quiescent output drift is limited to ±10 mV (SENS_COARSE ≤ 10) or ±15 mV (SENS_COARSE = 11) across temperature. The A1365LKTTN-1-T's accuracy holds without recalibration across its full operating range.
Can the A1365LKTTN-1-T be used in PCB-constrained applications, and what is its package height?
Yes - the A1365LKTTN-1-T uses a 4-pin SIP package just 1 mm thick (suffix KT/TN), significantly thinner than standard SOIC or DFN alternatives. This low profile minimizes air gap in current-sensing cores, improving magnetic coupling efficiency and signal-to-noise ratio. The A1365LKTTN-1-T's through-hole mounting also enhances mechanical robustness in high-vibration automotive environments.
A1365LKTTN-1-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-1-T FAQ
1.How can I place an order for A1365LKTTN-1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1365LKTTN-1-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-1-T reliable?
The price and inventory of A1365LKTTN-1-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-1-T is usually 5 days.
3.What payment methods are accepted for A1365LKTTN-1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1365LKTTN-1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1365LKTTN-1-T?
A1365LKTTN-1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1365LKTTN-1-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-1-T?
For technical support, including A1365LKTTN-1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1365LKTTN-1-T requirements.
6.How does Aetrix verify that A1365LKTTN-1-T is sourced from the original manufacturer or authorized distributors?
All A1365LKTTN-1-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-1-T meets industry standards.
7.What is the process for return or replacement of A1365LKTTN-1-T?
All A1365LKTTN-1-T units undergo pre-shipment inspection (PSI). If there is an issue with A1365LKTTN-1-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-1-T part is unused and in its original packaging.
Return procedure for A1365LKTTN-1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A1365LKTTN-1-T Tags
-
DRV5053VAQDBZR
Texas Instruments
-
MMC5603NJ
Memsic Inc.
-
DRV5055A1QDBZR
Texas Instruments
-
MLX90392ELQ-AAA-011-RE
Melexis Technologies NV
-
CT100LW-HS6
Allegro MicroSystems
-
DRV5056A1ELPGMQ1
Texas Instruments
-
A1304ELHLX-T
Allegro MicroSystems
-
MMC5633NJL
Memsic Inc.
-
A1308KUA-2-T
Allegro MicroSystems
-
A1308KUA-1-T
Allegro MicroSystems
-
SI7210-B-04-IVR
Silicon Labs
-
A1308LLHLT-2-T
Allegro MicroSystems
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
