MS8313 Overview
The RELMON MS8313 is a fully integrated three-phase brushless DC (BLDC) motor driver IC housing three independent half-bridge power stages, built-in gate drive circuitry, low-side current sensing inputs, built-in comparators, and an onboard 3.3V LDO regulator — all within a single thermally enhanced eTSSOP-28 package. With a supply voltage range of 8V to 36V, the MS8313 is compatible with a broad range of DC power rails including 12V and 24V systems commonly used in home appliances, industrial equipment, and battery-powered platforms. The device supports both independent half-bridge control for maximum commutation flexibility and direct integration with external microcontrollers or dedicated BLDC control DSPs.
The MS8313 integrates low on-resistance power MOSFETs with a combined RDS(on) of 240mΩ, keeping conduction losses and junction temperature rise low at the device’s rated 1.75A continuous output current. A 2.5A peak current rating accommodates motor start-up inrush and transient load demands without requiring oversized external components. The three low-side current sensing pins enable accurate phase current measurement for field-oriented control (FOC) or trapezoidal commutation algorithms running on an external MCU, while the built-in comparators simplify back-EMF zero-crossing detection circuitry for sensorless drive implementations. The integrated 3.3V/10mA LDO supplies logic-level circuitry directly from the motor supply rail, reducing external component count and BOM cost.
The RELMON MS8313 is housed in an eTSSOP-28 package featuring an exposed thermal pad on the underside, enabling efficient heat transfer to the PCB copper pour and allowing the device to sustain rated output current without an external heatsink in most application scenarios. This combination of high integration, wide supply range, and thermal management capability makes the MS8313 a strong design-in choice wherever a compact, cost-effective 3-phase BLDC driver is required.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | MS8313 |
| Manufacturer | RELMON |
| Supply Voltage Range | 8V to 36V |
| Continuous Output Current (Io) | 1.75A |
| Peak Output Current (IPeak) | 2.5A |
| On-Resistance (RDS(on)) | 240mΩ |
| Quiescent Current (Iq) | 500µA |
| Drive Topology | 3× independent half-bridge (3-phase) |
| Current Sensing | 3× low-side sensing pins |
| Built-in Comparators | Yes |
| Integrated LDO | 3.3V / 10mA |
| Motor Type Supported | 3-phase brushless DC (BLDC) |
| Package | eTSSOP-28 (exposed thermal pad) |
| RoHS Compliance | Yes |
Applications
The RELMON MS8313 is well suited to any application requiring compact, efficient 3-phase BLDC motor drive at 8V–36V supply voltages. Primary application areas include HVAC fan and blower motors, washing machine drum drive units, vacuum cleaner motors, cordless power tools, and e-bike pedal assist drive systems. Its integrated current sensing pins and built-in comparators also make it a strong fit for drone propulsion ESCs, robotic joint actuators, and industrial conveyor and pump drives where sensored or sensorless FOC commutation is implemented in an external MCU or DSP.
Pin-to-Pin Compatible Alternatives
Adopting a pin-to-pin compatible replacement such as the MS8313 allows engineering and procurement teams to reduce unit BOM cost and strengthen supply chain resilience without requiring PCB layout changes or motor control firmware re-qualification.
| Reference Part Number | Original Manufacturer | Why Choose MS8313 |
|---|---|---|
| DRV8313 | Texas Instruments | Direct pin-to-pin compatible replacement in the same eTSSOP-28 package; RELMON MS8313 offers equivalent 3-phase half-bridge architecture at a lower unit cost through ABL Semi’s UK supply chain |
| DRV8303 | Texas Instruments | Compatible 3-phase gate drive function; MS8313 integrates power MOSFETs eliminating the need for external FETs required by the DRV8303, reducing total BOM cost and PCB area |
| TB67H450FNG | Toshiba | Functionally compatible 3-phase driver; MS8313’s integrated 3.3V LDO removes the need for an additional logic supply regulator present in some Toshiba reference designs |
| L6234 | STMicroelectronics | Pin-compatible 3-phase BLDC driver replacement; MS8313 provides lower RDS(on) and a wider 36V supply ceiling versus the L6234’s 52V-rated but higher on-resistance topology |
Frequently Asked Questions
Is MS8313 RoHS compliant?
Yes. The RELMON MS8313 is manufactured in compliance with the RoHS Directive (2011/65/EU), restricting hazardous substances including lead, cadmium, and mercury. RoHS compliance documentation is available upon request through ABL Semi.
What are the pin-to-pin replacements for MS8313?
The MS8313 is a pin-to-pin compatible replacement for the TI DRV8313 in the same eTSSOP-28 package, and offers functional compatibility with the TI DRV8303, Toshiba TB67H450FNG, and STMicroelectronics L6234. Please refer to the compatibility table above for specific substitution advantages.
What is the minimum order quantity (MOQ) for MS8313?
ABL Semi offers flexible MOQ for MS8313, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for MS8313?
The RELMON MS8313 is available in the eTSSOP-28 package, a thermally enhanced thin shrink small-outline package featuring an exposed heatsink pad for direct thermal coupling to the PCB ground plane. This package is fully compatible with standard SMT reflow assembly processes. Contact ABL Semi to confirm current stock availability and lead times.
Does the MS8313 support both sensored and sensorless BLDC motor commutation?
Yes. The MS8313 provides three independent half-bridge control inputs and three low-side current sensing pins, giving an external microcontroller or DSP full access to phase switching and current feedback signals needed for both Hall-sensor-based (sensored) commutation and back-EMF zero-crossing (sensorless) commutation. The built-in comparators further simplify sensorless back-EMF detection circuit design, reducing the external component count required around the MCU’s analogue input stage. The choice of commutation strategy — trapezoidal, sinusoidal, or FOC — is entirely determined by the external controller firmware, giving designers maximum flexibility with a single hardware platform.
For complete product specifications, please refer to: