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BD6941FM-E2 Equivalent & Substitute Parts
Part Overview
The BD6941FM-E2 is a fully integrated motor driver IC manufactured by Rohm Semiconductor, designed for brushed DC motor control applications. It integrates both control and power stages in a single package, operating across an 8V to 16V supply range with 1.25A output current capability. The device is housed in a 36-HSOP package with dual heat tabs for thermal management and is rated for automotive-grade applications across -40°C to 150°C junction temperature.
The BD6941FM-E2 carries a "Not For New Designs" product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production requirements for existing applications.
Substiute Parts
Key Parameters
| Parameter | BD6941FM-E2 |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Motor Type Support | Brushed DC |
| Function | Driver - Fully Integrated, Control and Power Stage |
| Output Configuration | Half Bridge (2) |
| Interface | Parallel |
| Technology | Power MOSFET |
| Current - Output | 1.25A |
| Voltage - Supply | 8V ~ 16V |
| Voltage - Load | 8V ~ 16V |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Package / Case | 36-SOP (0.295", 7.50mm Width) + 2 Heat Tabs |
| Mounting Type | Surface Mount |
| Grade | Automotive |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution eligibility for the BD6941FM-E2 is determined by the following critical parameters:
- Motor Type Support: Brushed DC motor driver capability
- Function: Fully integrated control and power stage
- Output Configuration: Half bridge topology (2 outputs)
- Interface: Parallel control interface
- Technology: Power MOSFET implementation
- Operating Temperature Range: Minimum -40°C to 150°C junction temperature
- Voltage Supply Range: Overlap with 8V to 16V operating window
- Output Current: Minimum 1.25A capability
- Compliance: ROHS3 compliance and automotive-grade qualification
Substitute parts are grouped into two categories based on voltage operating range:
Category A - Standard Voltage Range (8V+): DRV8828PWP, DRV8828PWPR, DRV8829PWP, DRV8829PWPR. These devices operate within or exceed the BD6941FM-E2 voltage specification and support higher output current (3A to 4.6A).
Category B - Lower Voltage Range (2.75V+): DRV8832DGQ, DRV8832DGQR, DRV8832DRCR, DRV8832DRCT, DRV8832QDGQQ1. These devices operate at reduced voltage ranges and are suitable for battery-powered applications with 1A output current.
Category C - Bipolar Stepper Support: A4973SLBTR-T. This device supports both bipolar stepper and brushed DC motor types with reduced voltage range (3V to 5.5V).
Parameter Comparison
| Parameter | BD6941FM-E2 | A4973SLBTR-T | DRV8828PWP | DRV8829PWP | DRV8832DGQ |
|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Allegro MicroSystems | Texas Instruments | Texas Instruments | Texas Instruments |
| Motor Type - Brushed DC | Yes | Yes | Yes | Yes | Yes |
| Motor Type - Stepper | No | Bipolar | Bipolar | Bipolar | Bipolar |
| Output Configuration | Half Bridge (2) | Half Bridge (2) | Half Bridge (2) | Half Bridge (2) | Half Bridge (2) |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Technology | Power MOSFET | Power MOSFET | Power MOSFET | Power MOSFET | Power MOSFET |
| Current - Output | 1.25A | 1.5A | 3A | 4.6A | 1A |
| Voltage - Supply | 8V ~ 16V | 3V ~ 5.5V | 8.2V ~ 45V | 8.2V ~ 45V | 2.75V ~ 6.8V |
| Voltage - Load | 8V ~ 16V | 5V ~ 50V | 8.2V ~ 45V | 8.2V ~ 45V | 2.75V ~ 6.8V |
| Operating Temperature | -40°C ~ 150°C | -20°C ~ 150°C | -40°C ~ 150°C | -40°C ~ 150°C | -40°C ~ 150°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Grade | Automotive | Not specified | Not specified | Not specified | Not specified |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 2 (1 Year) | 3 (168 Hours) | 1 (Unlimited) | 3 (168 Hours) | 2 (1 Year) |
Engineering Selection Recommendations
For 8V to 16V Supply Applications with Standard Current Requirements:
DRV8828PWP, DRV8828PWPR, DRV8829PWP, and DRV8829PWPR are direct functional equivalents. These Texas Instruments devices maintain the 8V+ supply voltage compatibility and provide equal or higher output current (3A to 4.6A). All variants carry active product status and ROHS3 compliance. The DRV8829 series offers marginally higher current capability (4.6A) compared to DRV8828 (3A). Tape & Reel packaging (PWPR variants) is available for high-volume production; Tube packaging (PWP variants) suits lower-volume requirements.
For Automotive-Grade Applications:
The BD6941FM-E2 carries explicit automotive-grade qualification. Among substitutes, DRV8832QDGQQ1 is the only variant with automotive-grade designation and AEC-Q100 qualification. This device operates at reduced voltage (2.75V to 6.8V) and 1A output current, suitable only for battery-powered automotive subsystems within its voltage envelope.
For Lower Voltage or Battery-Powered Applications:
DRV8832 variants (DGQ, DGQR, DRCR, DRCT, QDGQQ1) operate across 2.75V to 6.8V and deliver 1A output current. These are appropriate for battery-powered motor control where supply voltage is constrained below 8V. All DRV8832 variants maintain -40°C to 150°C operating temperature and ROHS3 compliance.
For Bipolar Stepper Motor Support:
A4973SLBTR-T from Allegro MicroSystems supports both bipolar stepper and brushed DC motor types. It operates at 3V to 5.5V supply with 1.5A output current. This device is suitable only for applications where stepper motor capability is required and voltage supply is limited to 5.5V maximum.
Compliance Considerations:
All substitute parts maintain ROHS3 compliance and EAR99 export classification matching the BD6941FM-E2. Moisture sensitivity levels vary; DRV8828 and DRV8832DRCR/DRCT offer unlimited MSL (Level 1), while other variants require controlled storage conditions (MSL 2 or 3).
Frequently Asked Questions (FAQ)
Q: Can DRV8828PWP or DRV8829PWP directly replace BD6941FM-E2 in existing designs?
A: Functional substitution is possible for brushed DC motor applications within the 8V to 16V supply range. Both devices provide half-bridge topology with parallel interface and Power MOSFET technology. However, package differences exist: BD6941FM-E2 uses 36-HSOP while DRV8828/DRV8829 use 28-HTSSOP. PCB layout modifications are required. Output current capability is higher (3A to 4.6A versus 1.25A), which is compatible with existing designs but does not require design changes.
Q: What is the voltage compatibility range for substitutes?
A: BD6941FM-E2 operates at 8V to 16V. DRV8828/DRV8829 series extend this to 8.2V to 45V, providing full compatibility and additional headroom. DRV8832 series operate at 2.75V to 6.8V and are not suitable for the standard 8V to 16V application window. A4973SLBTR-T operates at 3V to 5.5V and is incompatible with 8V+ supply requirements.
Q: Are all substitutes automotive-grade qualified?
A: No. Only DRV8832QDGQQ1 carries explicit automotive-grade designation with AEC-Q100 qualification. The BD6941FM-E2 is automotive-grade; other substitutes lack this certification. For automotive applications, DRV8832QDGQQ1 is the only qualified alternative, though it operates at reduced voltage and current.
Q: What packaging options are available for high-volume production?
A: Tape & Reel (TR) packaging is available for BD6941FM-E2, DRV8828PWPR, and DRV8829PWPR. Cut Tape (CT) & Digi-Reel® packaging is available for A4973SLBTR-T, DRV8832DGQR, DRV8832DRCR, DRV8832DRCT, and DRV8829PWPR. Tube packaging is available for DRV8828PWP, DRV8829PWP, and DRV8832DGQ. Selection depends on production volume and supply chain requirements.
Q: Can DRV8832 variants substitute for BD6941FM-E2?
A: DRV8832 variants are not suitable for standard 8V to 16V applications. They operate at 2.75V to 6.8V maximum supply voltage, which is below the BD6941FM-E2 minimum of 8V. These devices are appropriate only for battery-powered applications with constrained voltage supply.
Q: What is the moisture sensitivity impact of different MSL ratings?
A: BD6941FM-E2 carries MSL 2 (1 Year storage). DRV8828 variants offer MSL 1 (Unlimited), providing superior shelf life without controlled storage. DRV8829 and most DRV8832 variants carry MSL 2 or 3, requiring controlled humidity storage (168 hours to 1 year). For long-term inventory management, DRV8828 variants offer logistical advantages.
Q: Is A4973SLBTR-T compatible with brushed DC motor applications?
A: Yes, A4973SLBTR-T supports brushed DC motors. However, its 3V to 5.5V supply range is incompatible with the BD6941FM-E2 standard 8V to 16V window. It is suitable only for low-voltage brushed DC applications where stepper motor capability is also required.
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