Texas Instruments MCT8315Z0HRRYR

Overview

MCT8315Z0HRRYR from Texas Instruments is a sensored trapezoidal three-phase BLDC motor driver IC with integrated 40-V FETs, 4-A peak output current, 275-mΩ typical R_DS(ON) (HS+LS), and hardware-based configuration (MCT8315ZH variant). It supports analog/digital Hall inputs, up to 200-kHz PWM, active demagnetization, and operates from 4.5 V to 35 V - enabling compact, code-free motor control in robotic vacuum actuators.

For engineers reviewing the MCT8315Z0HRRYR datasheet, MCT8315Z0HRRYR pinout, MCT8315Z0HRRYR application, or MCT8315Z0HRRYR equivalent, key selection considerations include its WQFN-32 (6 mm × 4 mm) package with exposed thermal pad, integrated buck (5 V/200 mA) and LDO (3.3 V/30 mA), cycle-by-cycle current limiting without external sense resistors, and configurable slew rate, advance angle, and motor lock protection.

Technical Context

The MCT8315Z0HRRYR implements Hall sensor–based 120° trapezoidal commutation using three integrated analog comparators and configurable logic-level inputs (ADVANCE, MODE, SLEW, DIR). Its gate drivers support synchronous/asynchronous PWM modulation with programmable dead time (500–3400 ns) and slew rate control across four discrete levels (15–345 V/µs).

It integrates dual on-chip regulators: a buck converter (adjustable 3.3 V/5.0 V output, 200 mA max) and an LDO (3.3 V, 30 mA), both powered from VM. Protection includes UVLO, OCP, CPUV, OTW/TSD, motor lock detection, and fault reporting via open-drain nFAULT - all configurable via hardware pins, not firmware.

Key Specifications

Pinout & Package

Package: 32-pin WQFN (RRY), 6 mm × 4 mm with exposed thermal pad (connected to AGND). Thermal resistance: R_θJA = 30.4°C/W, R_θJC(bot) = 3.2°C/W - requires PCB copper pour under thermal pad for reliable 4-A operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BLDC motor driver applications.

Compared with DRV8313RTAT and MP6532GQ-Z, the MCT8315Z0HRRYR delivers higher peak current (4 A), lower conduction loss (275 mΩ), and full Hall signal conditioning - reducing BOM count and layout area in space-constrained BLDC modules.

Availability

MCT8315Z0HRRYR is available at Aetrix Electronics and suitable for robotic vacuum actuation, CPAP blower control, office automation print engines, and small appliance fan modules requiring stable component supply, long-term manufacturability, and automotive-grade reliability.

Supply support for MCT8315Z0HRRYR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies - with decades of expertise in motor control ICs and industrial-grade reliability.

The MCT8315Z product line delivers code-free, sensored BLDC solutions targeting cost-sensitive, high-volume applications in home appliances, medical devices, and factory automation - where rapid time-to-market and minimal firmware dependency are critical.

FAQ

What is the package type and thermal pad connection requirement for MCT8315Z0HRRYR?

The MCT8315Z0HRRYR uses a 32-pin WQFN (RRY) package measuring 6 mm × 4 mm with an exposed thermal pad. This pad must be soldered directly to AGND on the PCB using a minimum 4×4 array of thermal vias (0.3-mm diameter, 1.2-mm pitch) to achieve R_θJC(bot) = 3.2°C/W and sustain 4-A continuous operation without thermal derating. Failure to connect the pad results in junction temperature exceeding 150°C under load.

Does MCT8315Z0HRRYR support both analog and digital Hall sensors?

Yes, MCT8315Z0HRRYR supports differential analog Hall elements, single-ended analog output Hall-effect sensors, and digital output Hall-effect sensors via dedicated HPA/HNA, HPB/HNB, and HPC/HNC pins. Internal comparators and hysteresis eliminate external signal conditioning - enabling direct connection of common 3-wire Hall ICs (e.g., Allegro A342x, Melexis US5881) without level-shifting or filtering components.

How does the integrated current limiting function in MCT8315Z0HRRYR differ from traditional shunt-based methods?

MCT8315Z0HRRYR implements cycle-by-cycle current limiting using internal MOSFET R_DS(ON) sensing - not external shunt resistors. The ILIM pin sets a reference voltage (AVDD/2 to AVDD/2 − 0.32 V) that compares against sensed voltage drop across the FETs. This eliminates PCB area, power loss, and accuracy drift associated with shunts while maintaining ±10% current limit tolerance across temperature and process variation.

Can MCT8315Z0HRRYR operate without an external microcontroller?

Yes, MCT8315Z0HRRYR is designed as a code-free solution: it spins BLDC motors autonomously using only Hall sensor inputs, a PWM speed command, and hardware configuration pins (MODE, ADVANCE, SLEW, DIR). No firmware, boot ROM, or external MCU is required - making it ideal for applications where MCU resources are constrained or where deterministic, low-latency motor control is essential.

What protection features are integrated into MCT8315Z0HRRYR, and how are faults reported?

MCT8315Z0HRRYR integrates supply UVLO, charge pump undervoltage (CPUV), overcurrent protection (OCP), motor lock detection, thermal warning (OTW), and thermal shutdown (TSD). All faults assert the open-drain nFAULT pin low. For MCT8315Z0HRRYR (hardware variant), fault cause is inferred from timing and external monitoring; SPI variants allow register-read diagnostics, but MCT8315Z0HRRYR relies on nFAULT pulse width or external logic for root-cause identification.