Low-Noise 350 mA, 410 kHz Transformer Driver  - SN6501


Low-Noise 350 mA, 410 kHz Transformer Driver



The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3.3-V or 5-V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio.

The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make action between the two switches.

The SN6501 is available in a small SOT-23 (5) package, and is specified for operation at temperatures from –40&de;C to 125°C.


  • Push-Pull Driver for Small Transformers
  • Single 3.3-V or 5-V Supply
  • High Primary-side Current Drive:
    • 5-V Supply: 350 mA (Max)
    • 3.3-V Supply: 150 mA (Max)
  • Low Ripple on Rectified Output Permits
    Small Output Capacitors
  • Small 5-Pin SOT-23 Package

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Parametrics Compare all products in Transformer Driver

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (A)
Soft Start
Special Features
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Approx. Price (US$)
Iout (Max) (A)
Shutdown Current (Typ) (uA)
Switch Current Limit (Typ) (A)
Undervoltage Lockout
SN6501 SN6505A SN6505B
3    2.25    2.25   
5.5    5.5    5.5   
0    0    0   
11    16    16   
0.25    2.4    1   
N/A    Fixed    Fixed   
Enable    Enable
Power Good   
Power Good   
410    100    100   
620    600    1600   
Catalog    Catalog    Catalog   
-40 to 125    -55 to 125    -55 to 125   
SOT-23    SOT-23    SOT-23   
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
0.80 | 1ku    1.95 | 1ku    1.95 | 1ku   
0.5    1.5    1.5   
N/A    1    1   
5SOT-23    6SOT-23    6SOT-23   
0.5    2    2   
Converter (Integrated Switch)    Transformer Driver    Transformer Driver   
N/A    Vin<1.7    Vin<1.7V   

Other qualified versions of SN6501

Version Part Number Definition
Automotive SN6501-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects