Allegro MicroSystems A6850KLTR-T

Overview

The A6850KLTR-T from Allegro MicroSystems is a dual-channel high-side switch interface IC designed to drive and monitor two-wire Hall effect sensor ICs (e.g., A114x/A118x) in automotive and industrial systems. It integrates protected DMOS high-side switches rated for 26.5 V operation, delivers ≥25 mA per channel before current limiting, provides 1/10 current-sense mirroring on SENSE1/SENSE2 pins, and supports –40°C to +150°C ambient operation.

For engineers reviewing the A6850KLTR-T datasheet, A6850KLTR-T pinout, A6850KLTR-T application, or A6850KLTR-T equivalent, this page delivers verified technical context, real-world timing and fault-handling behavior, package-validated thermal derating guidance, and direct alternative part comparisons for Hall sensor interface design and diagnostic system integration.

Technical Context

The A6850KLTR-T implements two independent, thermally protected high-side DMOS switches with integrated current-limiting (–25 to –45 mA), overvoltage shutdown (27–33 V), and thermal shutdown (175°C). Each channel features dedicated ENABLE inputs and scaled SENSE outputs delivering I_OUTPUTx/10 ±100 µA offset, enabling precise two-wire Hall status detection via microprocessor ADC without external shunt resistors.

It operates across 4.75–26.5 V supply range, enters <15 µA sleep mode when both ENABLE pins are low, and withstands short-to-battery (with 1 µF VIN bypass), short-to-ground, and 40 V load dump events. Its SOIC-8 L-package thermal resistance is 140°C/W on 1-layer PCBs, requiring explicit power dissipation calculation using R_DS(on) ≤35 Ω and junction temperature modeling.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (L suffix), Pb-free with 100% matte tin leadframe plating; 4.90 mm × 3.90 mm body, 1.27 mm pitch, 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel Hall sensor interface applications.

Compared with MAX14919AUB+T and TLE7240SL, the A6850KLTR-T uniquely combines dual-channel independence, integrated 1/10 current mirroring, <15 µA sleep current, and AEC-Q100-compliant fault robustness in an SOIC-8 footprint - making it optimal for space-constrained, low-power automotive Hall sensor interfaces requiring minimal external components.

Availability

A6850KLTR-T is available at Aetrix Electronics and suitable for engine speed sensing, transmission gear position detection, brake pedal monitoring, and steering angle sensor interfacing requiring stable component supply across automotive production lifecycles.

Supply support for A6850KLTR-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 designer and manufacturer of high-performance Hall-effect sensors, motor drivers, and power ICs, specializing in automotive and industrial motion control solutions.

The A6850KLTR-T belongs to Allegro's dual-channel Hall interface product line, engineered specifically to simplify and harden two-wire Hall sensor connections in harsh automotive environments while eliminating external shunt components.

FAQ

What is the primary function of the A6850KLTR-T in a Hall sensor system?

The A6850KLTR-T serves as a dual-channel high-side switch interface that supplies regulated power to two-wire Hall effect sensors (e.g., A114x/A118x) and mirrors their supply current at a 1/10 ratio onto dedicated SENSE pins. This enables direct ADC-based status monitoring and fault diagnosis - such as open-circuit, short-to-ground, or short-to-battery - without external shunt resistors. The A6850KLTR-T also provides current limiting, thermal shutdown, and sleep mode to meet automotive reliability requirements.

Does the A6850KLTR-T require external components to interface with a microcontroller ADC?

No, the A6850KLTR-T eliminates the need for external shunt resistors by integrating a precision 1/10 current mirror onto its SENSE1 and SENSE2 pins. A simple sense resistor (e.g., 1.5 kΩ) from each SENSE pin to ground generates a voltage compatible with standard microcontroller ADC inputs. The A6850KLTR-T datasheet specifies that V_SENSE must remain ≤6 V, and recommends a 1 µF bypass capacitor on VIN to ensure stability during load-dump events - but no additional protection diodes or filtering are required for basic operation.

How does the A6850KLTR-T handle short-circuit faults on its OUTPUT pins?

The A6850KLTR-T limits output current to –25 to –45 mA during short-to-ground events and disables outputs during short-to-battery conditions when V_OUTPUTx exceeds VIN + 0.7 V. It survives 40 V load dumps and incorporates reverse-bias blocking (750 µA max leakage) on OUTPUT pins. These protections are hardware-based and require no software intervention. The A6850KLTR-T also features thermal shutdown at 175°C with 15°C hysteresis to prevent damage during sustained overloads - all confirmed per AEC-Q100 test standards.

Can the A6850KLTR-T be used with mechanical switches instead of Hall sensors?

Yes, the A6850KLTR-T supports mechanical switch interfacing in switch-to-ground configurations. When driving mechanical loads, a series current-limiting resistor must be added to prevent excessive power dissipation in the A6850KLTR-T's DMOS switches. For example, with VIN = 12 V and a 1 kΩ series resistor, output current drops to ~11.6 mA, reducing power dissipation from 540 mW (no resistor) to ~4.6 mW per channel. The A6850KLTR-T's ENABLE pins retain full control, and SENSE outputs still provide proportional current feedback for switch-state monitoring.

What is the significance of the "L" suffix and "-T" suffix in A6850KLTR-T?

The "L" suffix in A6850KLTR-T denotes the 8-pin SOIC package with lead-free construction and 100% matte tin leadframe plating, per Allegro's standardized packaging nomenclature. The "-T" suffix indicates tape-and-reel packaging: specifically, 13-inch reels containing 3000 units per reel. This format is optimized for automated SMT assembly and aligns with industry-standard JEDEC MS-012AA dimensions and IPC-7351 land pattern guidelines referenced in the A6850KLTR-T datasheet.