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Alternatives to onsemi FAN7387

onsemi FAN7387 and its qualified second sources, compared on form, fit and function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for onsemi FAN7387

FAN7387 compared against its qualified second sources
FAN7387onsemiNCL30059BDR2GonsemiIRS21531DSPBFInfineon Technologies+1more
FFF CompatibilityThe power stage pins (Pins 4 to 8: GND, LO, VS, HO, VB) match the FAN7387 exactly. However, the low-voltage control pins (Pins 1 to 3: VCC, Rt, BO) differ from the target's (RCT, VDD, DT/SD) and require layout/component modifications.Both parts are housed in the industry-standard 8-SOIC package with matching physical dimensions and mounting footprints.Both are high-voltage self-oscillating half-bridge gate drivers operating up to 600V, supporting frequency control and dead-time adjustments.Power stage connections on pins 4 to 8 (COM, LO, VS, HO, VB) are functionally aligned, but the low-voltage control interface on pins 1 to 3 (VCC, RT, CT) is different and requires redesign.Supplied in a standard 8-SOIC package matching the physical dimensions of the target.Operates as a self-oscillating 600V half-bridge driver with adjustable frequency via an external RC network.
AI Summary

FAN7387 by onsemi: onsemi SELF-OSCILLATED DRIVER.

The NCL30059BDR2G is the manufacturer-recommended replacement for the FAN7387 series. It is a highly stable, active self-oscillating half-bridge driver tailored for resonant topologies. It shares the same power-stage pin configuration on pins 4–8, but requires a board layout change around the control pins 1–3.

  • Manufacturer recommended replacement part.
  • Active lifecycle status with strong long-term availability.
  • Integrates adjustable brown-out protection and PFC delay timer.
  • Control pins (1 to 3) have different electrical assignments, preventing a direct drop-in replacement without a PCB change.
  • Features a fixed internal dead-time of 610 ns instead of resistor-programmable dead-time.

The IRS21531DSPBF is a widely used 600V self-oscillating half-bridge driver from Infineon. It serves as a strong functional alternative, using a classic RC oscillator network to establish frequency. However, it is nearing its end-of-life (EOL) phase and requires layout changes on the control pins.

  • Industry standard self-oscillating driver architecture with CMOS 555-style front-end.
  • Includes an internal bootstrap diode, simplifying external circuitry.
  • Power stage pins 4 to 8 match the target's pin configuration.
  • Designated as End of Life (EOL) or scheduled for obsolescence by the manufacturer.
  • Control pin layout is incompatible, requiring a PCB layout revision.
Lifecycle StatusActiveActiveObsolete
Market AvailabilityNon-stockIn stockIn stock
REACHUnknownREACHREACH
RoHSUnknownRoHSRoHS
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