Bipolar transistors

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ESD protection, TVS, filtering and signal conditioning

MOSFETs

SiC MOSFETs

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Analog & Logic ICs

Automotive qualified products (AEC-Q100/Q101)

SOT8061-1

NXF6505-Q100

Low-noise, 1.2 A transformer driver for isolated power supplies

The NXF6505A/B-Q100 is a specialized push-pull transformer driver that is designed for isolated power supplies in small form factors. This driver is capable of driving low-profile, center-tapped transformers from a 2.25 V to 5.5 V DC power supply, while achieving ultra-low noise and EMI using slew rate control and Spread Spectrum Clocking (SSC).

The NXF6505A/B-Q100 features internal protection features such as current limiting, undervoltage lockout, thermal shutdown, and break-before-make circuitry, ensuring the device operates within safe limits. The device also includes a soft-start feature that prevents high inrush current during power-up with large load.

The NXF6505A/B-Q100 is constructed using an oscillator and a gate drive circuit that produces complementary output signals to drive ground-referenced N-channel power switches. These two complementary 1.2 A Power-MOSFET switches can be used to provide >6 W power. The 440 kHz internal oscillator is for applications that require higher efficiency and smaller transformers. The NXF6505A/B-Q100 is available in a small 6 pin SOT8061-1 package and is characterized for operation within a temperature range of -55 °C to 125 °C.

This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 1) and is suitable for use in automotive applications.

Features and benefits

  • Automotive product qualification in accordance with AEC-Q100 (Grade 1)

    • Specified from -55 °C to +125 °C

  • Push-pull driver for transformers, optimized for low EMI:

    • Slew-rate control output
    • Spread Spectrum Clocking (SSC)
  • Wide input voltage range: 2.25 V to 5.5 V
  • High output drive: 1.2 A at 5 V supply
  • Low RON 0.2 Ω maximum at 5 V supply
  • Internal switching frequency:
    • for NXF6505A-Q100: 160 kHz
    • for NXF6505B-Q100: 440 kHz
  • Synchronization of multiple devices with external clock input
  • 2.2 A current limit at 5 V
  • Enable pin to put device in low shutdown current: <1 μA
  • Thermal shutdown protection
  • Soft-start start-up
  • Small 6 pin SOT8061-1 (SC-74; TSOP-6) package
  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 3A exceeds 6000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1500 V

Applications

  • Isolated power supply for automotive and industrial applications including:
    • CAN, RS-485, RS-422, RS-232, SPI, I²C, low-power LAN
  • Low-noise isolated USB supplies
  • Process control
  • Telecom supplies
  • Radio supplies
  • Distributed supplies
  • Medical instruments
  • Precision instruments
  • Low-noise filament supplies
  • Motor control
  • Isolated power supplies for automotive (AEC-Q100)
    • Traction inverter
    • DC-DC converter
    • Battery management system
    • On-board charger

Package

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
NXF6505ADA-Q100 NXF6505ADA-Q100Z
(935691938342)
Active N5A SOT8061-1
TSOT23-6
(SOT8061-1)
SOT8061-1 REFLOW_BG-BD-1
SOT8061-1_342
NXF6505BDA-Q100 NXF6505BDA-Q100Z
(935691940342)
Active N5B SOT8061-1
TSOT23-6
(SOT8061-1)
SOT8061-1 REFLOW_BG-BD-1
SOT8061-1_342

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
NXF6505ADA-Q100 NXF6505ADA-Q100Z NXF6505ADA-Q100 rohs rhf rhf
NXF6505BDA-Q100 NXF6505BDA-Q100Z NXF6505BDA-Q100 rohs rhf rhf
Quality and reliability disclaimer

Documentation (10)

File name Title Type Date
NXF6505_Q100 Low-noise, 1.2 A transformer driver for isolated power supplies Data sheet 2024-09-17
AN90063 Questions about package outline drawings Application note 2025-06-13
NXF6505_IBIS_Model NXF6505 IBIS model IBIS model 2024-04-25
SOT8061-1 Plastic, surface-mounted package (TSOT23-6); 6 leads Package information 2024-09-18
REFLOW_BG-BD-1 Reflow soldering profile Reflow soldering 2021-04-06
NXF6505A_SpiceModel NXF6505A Spice model SPICE model 2024-04-25
NXF6505B_SpiceModel NXF6505B Spice model SPICE model 2024-04-25
TN90008 Reduce radiated emissions in isolated power designs using NXF650x-Q100 Technical note 2024-09-16
TN90009 Protection features of NXF5650x transformer drivers Technical note 2024-10-01
UM90033 NXF6501-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board User manual 2024-07-02

Support

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Models

File name Title Type Date
NXF6505_IBIS_Model NXF6505 IBIS model IBIS model 2024-04-25
NXF6505A_SpiceModel NXF6505A Spice model SPICE model 2024-04-25
NXF6505B_SpiceModel NXF6505B Spice model SPICE model 2024-04-25

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