MCT8316A - 40V, 8A Sensorless BLDC Motor Driver | Texas Instruments
MPN: MCT8316A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.2 | $320.00 |
| 500 | $2.75 | $1,375.00 |
| 1,000 | $2.38 | $2,380.00 |
MCT8316A Overview
A sensorless trapezoidal control BLDC driver is a motor driver that uses back-EMF sensing to determine rotor position, eliminating Hall-effect sensors and reducing system cost, wiring complexity, and failure points in harsh environments. The MCT8316A belongs to the integrated FET motor driver family within the broader power management and motor control IC hierarchy, combining gate drivers, power FETs, and control logic in one package.
Key features include three integrated NMOS half-bridges with very low on-resistance (95 mOhm high-side + low-side per the MCT8316A-Q1 product data), support for both I2C (MCT8316AV) and hardware-interface (MCT8316AT) versions, configurable startup and stop options, active demagnetization, and optional closed-loop speed control. An integrated adjustable buck regulator and LDO generate 3.3-V or 5.0-V rails that can also power external circuitry.
The architecture implements code-free trapezoidal commutation with internal back-EMF sensing, so no firmware development is required for basic operation. Two 12-bit DACs output analog voltages proportional to internal digital variables on DACOUT1 and DACOUT2 pins, enabling real-time tuning and diagnostics. Protection features include undervoltage lockout (UVLO), overcurrent protection (OCP), overtemperature warning and shutdown (OTW/OTSD), and abnormal voltage suppression (AVS).
Typical applications include power tools, vacuum robots, drones, fans, and pumps, where the <50 ms startup and 3 kHz electrical capability support rapid acceleration and high rotational speed. The I2C variant adds advanced configuration and monitoring for smart appliances and industrial equipment.
Design consideration: provide adequate bulk capacitance on the motor supply to absorb 8-A peak transients, and use short, low-inductance traces to the motor terminals to limit EMI; the exposed thermal pad needs a solid copper pour for heat dissipation at high continuous loads.
This page synthesizes distributor pricing, drop-in alternatives, comparison data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for MCT8316A — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCT8316A1VRGFR
✅ Drop-In📋 Reference alternative (not in catalog)
MCT8316A-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
MCT8316Z
✅ Drop-In📋 Reference alternative (not in catalog)
MCT8316AV
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCT8316AT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCF8316A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCT8316A Maximum Ratings & Electrical Characteristics
| Motor Control Type | Sensorless trapezoidal control BLDC |
| Number of Phase Outputs | 3-phase (three 1/2-H bridges) |
| Maximum Supply Voltage | 40 V |
| Peak Output Current | 8 A |
| Motor Voltage Range | 12 V to 24 V |
| RDS(on) (HS + LS) | 95 mOhm |
| Maximum Electrical Frequency | 3 kHz |
| Minimum Startup Time | < 50 ms |
| Control Interface | I2C (MCT8316AV variant) or Hardware pins (MCT8316AT variant) |
| Integrated Power FETs | Yes (3 half-bridges, NMOS) |
| Integrated Regulators | Adjustable buck regulator + LDO (3.3 V or 5.0 V output) |
| DAC Outputs | 2 x 12-bit DACOUT for variable monitoring |
| Protection Features | UVLO, OCP, OTW, OTSD, AVS |
| Startup / Stop Options | Configurable |
| Speed Control | Open-loop and optional closed-loop |
| Package | 40-VQFN (7x5 mm) with exposed thermal pad |
| Mounting Type | Surface Mount |
| Lifecycle Status | Active |
MCT8316A 40-vqfn (7x5 mm) with exposed thermal pad Pin Configuration Guide
Pin configuration for MCT8316A (40-vqfn (7x5 mm) with exposed thermal pad package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for MCT8316A.
Refer to the datasheet for full pin configuration.
Typical Applications
MCT8316A is suitable for 6 applications: Power Tools, Vacuum Robots, Drones and UAV Propulsion, Cooling Fans and Blowers, Pumps, Home Appliance BLDC Systems.
Power Tools
Cordless and corded power tools demand fast spin-up, high torque transients, and rugged 12- to 24-V battery operation - exactly the profile the MCT8316A was built for. Its under-50 ms sensorless startup gives drills and saws immediate response to trigger input, while the 8-A peak integrated power stage absorbs stall and acceleration currents without external FETs. Sensorless trapezoidal control eliminates Hall sensors that fail under shock and vibration, and integrated OCP, UVLO, OTSD, and AVS protection tolerates the abusive electrical environment of battery tools. The code-free operation also shortens time-to-market for tool platforms.
Recommended
Vacuum Robots
Robot vacuum suction motors run from 12- to 24-V battery rails and need quiet, efficient, sensorless operation in a compact assembly. The MCT8316A drives these BLDC blowers with its integrated 95 mOhm (HS+LS) power stage, minimizing conduction losses that drain the battery, while active demagnetization reduces switching losses during high-speed commutation. The I2C variant (MCT8316AV) lets the robot main controller adjust suction power, read fault status, and monitor speed over the existing I2C bus. Hall-sensor elimination improves reliability in dusty environments where contamination degrades magnetic sensors.
Recommended
Drones and UAV Propulsion
Compact drone propulsion motors are high-Kv BLDC machines whose electrical frequencies push well into the kilohertz range; the MCT8316A supports up to 3 kHz electrical operation, covering these high-RPM propeller loads. The sub-50 ms startup time delivers rapid throttle response essential for flight stability, and the 40-V tolerance accommodates 4S-to-higher-cell battery transients during aggressive maneuvers. Sensorless trapezoidal control removes Hall sensors and their wiring mass, and the integrated 8-A peak stage handles acceleration bursts without external FETs, keeping propulsion ESCs small and light for multirotor and fixed-wing platforms.
Recommended
Cooling Fans and Blowers
Server, telecom, and appliance cooling fans benefit from the MCT8316A's sensorless operation and integrated protection suite. The device drives 12- and 24-V BLDC fan motors at high electrical frequency without Hall sensors that add cost and failure points in continuous-duty applications. The I2C variant reports speed and fault status to a host controller, supporting predictive-maintenance schemes, and the 12-bit DACOUT outputs allow OEMs to observe internal variables on an oscilloscope for acoustic optimization. UVLO, OCP, OTW/OTSD, and AVS protections guard against blocked-rotor and brown-out events common in fan service.
Recommended
Pumps
Water, fuel, and circulation pumps in industrial and consumer equipment use 12- to 24-V BLDC motors well matched to the MCT8316A's ratings. Sensorless trapezoidal control keeps the electronics dry-side and eliminates Hall sensor cabling through wet or sealed assemblies, improving long-term reliability. The integrated 8-A peak capability handles pump startup torque and debris-induced stall transients, with OCP protecting the power stage during lockup. Closed-loop speed control maintains constant flow rate against varying head pressure, while the integrated buck regulator and LDO can power adjacent system circuitry, reducing external BOM count in compact pump housings.
Recommended
Home Appliance BLDC Systems
Blenders, air purifiers, kitchen exhausts, and other smart appliances increasingly replace brushed motors with sensorless BLDC for efficiency and acoustic reasons. The MCT8316A's code-free trapezoidal control lets appliance OEMs adopt BLDC without motor-control firmware investment, while the I2C variant (MCT8316AV) integrates with the appliance main controller for speed profiles, diagnostics, and fault reporting. The 3 kHz electrical ceiling covers high-speed blending motors, and integrated protections meet the abuse tolerance appliances require. Two 12-bit DAC outputs accelerate acoustic tuning by exposing commutation variables on a scope during development.
Recommended
Recommended Products Summary
Engineering reference data for MCT8316A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCT8316A1VRGFR | MCT8316A-Q1 | MCT8316Z | MCF8316A |
|---|---|---|---|---|---|
| Package | 40-VQFN (7x5 mm), exposed thermal pad | 40-VQFN (7x5) - same | 40-VQFN (7x5) - same | 40-VQFN (7x5) - same | 40-VQFN (7x5) - same family package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Control Algorithm | Sensorless trapezoidal (code-free) | Sensorless trapezoidal | Sensorless trapezoidal | Sensorless trapezoidal family | Sensorless FOC |
Key Differentiators
- Code-free high-speed trapezoidal operation up to 3 kHz electrical (vs MCF8316A)
- Automotive-qualified drop-in option available (vs MCT8316A-Q1)
- Sub-50 ms startup beats conventional sensorless solutions (vs MCT8316Z)
- Integrated buck + LDO power auxiliary circuits (vs MCT8316A1VRGFR)
Design Notes
Size bulk capacitance for the 8-A peak commutation currents. Estimated: with 500 mm of 24-V supply wiring at roughly 1 uH of loop inductance, a 1-A/us current edge can generate tens of volts of rail transient; local bulk capacitance (e.g., 22-47 uF electrolytic plus 0.1 uF ceramic per the datasheet layout guidance) adjacent to VM is essential. The integrated AVS feature adds tolerance to abnormal voltage events, but should be treated as a second line of defense, not a substitute for proper decoupling.
Estimated: at 3 A continuous with 95 mOhm total HS+LS on-resistance, conduction loss is approximately P = I^2 x R = 3^2 x 0.095 = 0.86 W, rising to roughly 6 W at the 8-A peak - the peak rating is short-duration. Solder the exposed thermal pad to a minimum 1 square inch copper pour with thermal vias to inner planes. Verify junction temperature with the datasheet theta-JA for the 40-VQFN (7x5) and the OTW/OTSD thresholds in your worst-case ambient.
Keep the half-bridge output traces to the motor connector short, wide, and symmetrical between phases to minimize parasitic inductance, EMI, and unbalanced commutation. Place gate-drive and power loops tightly within the 40-VQFN (7x5) footprint, and separate the sensitive back-EMF sense circuitry from switching nodes per the TI datasheet layout section. Use the MCT8316AEVM layout as a proven reference for the first PCB spin, and probe the DACOUT1/DACOUT2 pins during bring-up to verify internal variable behavior without firmware instrumentation.
Compliance Information
Compliance data was not included in the verified web data retrieved as of 2026-08-30. Consult the TI product page (https://www.ti.com/product/MCT8316A) quality and packing section for official RoHS/REACH status. The MCT8316A-Q1 variant exists for automotive qualification needs; the standard MCT8316A is not stated as AEC-Q100 qualified.
