The SN6501QDBVRQ1 from Texas Instruments is an automotive-qualified, low-noise push-pull transformer driver designed for compact isolated power supplies. It integrates an oscillator, gate-drive logic, and two ground-referenced N-channel power switches for driving the primary winding of a center-tapped transformer.
The device operates from a 3.0V to 5.5V supply range and is optimized for 3.3V and 5V systems. Maximum specified primary-side switch current is 350mA with a 5V supply and 150mA with a 3.3V supply. These values describe transformer-primary drive capability and should not be interpreted as isolated secondary-output current ratings.
At a 5V supply, typical switching frequency is 410kHz, with a specified range of 300kHz to 620kHz. At 3.3V, typical switching frequency is 360kHz, with a specified range of 250kHz to 495kHz.
The internal control architecture generates complementary drive signals and uses break-before-make timing between the two switches to prevent simultaneous conduction of both transformer-primary branches. Typical break-before-make time is approximately 50ns at 5V and 150ns at 3.3V.
Typical switch ON resistance is 0.6Ω at 5V and 1Ω at 3.3V, with maximum values of 2Ω and 3Ω respectively. Typical no-load device supply current is approximately 300µA at 5V and 150µA at 3.3V.
TI identifies isolated interface supplies for CAN, RS-485, RS-422, RS-232, SPI, I²C, and low-power LAN among the primary applications, along with industrial automation, process control, and medical equipment.
The SN6501QDBVRQ1 is a transformer driver rather than a standalone isolation device. The final galvanic-isolation rating and secondary output voltage depend on the selected transformer, turns ratio, rectifier, regulator, PCB creepage, clearance, and overall power-supply design.
The SN6501-Q1 does not include soft start, internal current limiting, or thermal shutdown. TI therefore recommends careful transformer and load selection to keep primary current within the device ratings, particularly during startup or with large capacitive loads.
The device is AEC-Q100 qualified to Grade 1, supporting an ambient operating-temperature range of −40°C to +125°C. It is also classified by TI as Functional Safety-Capable.
The exact SN6501QDBVRQ1 uses a 5-pin SOT-23 DBV package. TI lists NiPdAu lead finish, RoHS and REACH compliance, and an MSL 1 / 260°C / unlimited floor-life rating. Standard large tape-and-reel packaging contains 3,000 devices per reel, and TI currently lists the exact part as ACTIVE.
Key Specifications
- Manufacturer: Texas Instruments
- Manufacturer Part Number: SN6501QDBVRQ1
- Product Family: SN6501-Q1
- Device Type: Transformer Driver
- Topology: Push-Pull
- Grade: Automotive
- Qualification: AEC-Q100 Grade 1
- Supply Voltage: 3.0V to 5.5V
- Nominal Supply Systems: 3.3V / 5V
- Primary-Side Drive Current: 350mA Max at 5V
- Primary-Side Drive Current: 150mA Max at 3.3V
- Absolute Maximum Peak Switch Current: 500mA
- Typical Switching Frequency: 410kHz at 5V
- Switching Frequency Range: 300kHz to 620kHz at 5V
- Typical Switching Frequency: 360kHz at 3.3V
- Switching Frequency Range: 250kHz to 495kHz at 3.3V
- Typical Switch RON: 0.6Ω at 5V
- Maximum Switch RON: 2Ω at 5V
- Typical Switch RON: 1Ω at 3.3V
- Maximum Switch RON: 3Ω at 3.3V
- Typical No-Load Supply Current: 300µA at 5V
- Typical No-Load Supply Current: 150µA at 3.3V
- Break-Before-Make Logic: Yes
- Soft Start: No
- Internal Current Limit: No
- Thermal Shutdown: No
- Functional Safety-Capable: Yes
- Operating Temperature: −40°C to +125°C
- Package: SOT-23-5
- TI Package Code: DBV
- Pin Count: 5
- Body Size: Approximately 2.90 × 1.60mm
- Maximum Package Height: Approximately 1.45mm
- Mounting Type: Surface Mount
- Lead Finish: NiPdAu
- MSL: Level 1
- Peak Reflow Temperature: 260°C
- RoHS: Compliant
- REACH: Compliant
- Packaging: Large Tape and Reel
- Standard Reel Quantity: 3,000
- Product Status: ACTIVE
Pin Functions
- Pin 1 — D1: Open-drain output 1; connects to one end of the transformer primary
- Pin 2 — VCC: Supply input and transformer center-tap connection
- Pin 3 — D2: Open-drain output 2; connects to the opposite end of the transformer primary
- Pin 4 — GND: Ground
- Pin 5 — GND: Ground
Typical Applications
Suitable for isolated CAN, RS-485, RS-422 and RS-232 power supplies, digital-isolator bias supplies, isolated SPI/I²C interfaces, automotive isolated communications, industrial automation, process control, and compact isolated DC-DC power supplies.
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