IRS2109 High-Speed Power MOSFET & IGBT Driver IC
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IRS2109 MOSFET / IGBT Driver IC | 600V Half-Bridge Gate Driver for Power Electronics
The IRS2109 is a high-voltage, high-speed half-bridge MOSFET / IGBT driver IC with independent high-side and low-side output channels. The high-side floating channel supports N-channel MOSFETs or IGBTs in bootstrap configurations up to 600V — the standard driver topology for half-bridge / full-bridge PSU stages, motor controllers, and SMPS designs.
Headline features: 3.3V / 5V / 15V logic-compatible inputs, 10V-20V gate drive supply, undervoltage lockout (UVLO) on both channels, cross-conduction prevention logic, matched propagation delays, latch-immune CMOS / HVIC monolithic construction, reduced di/dt gate driver for noise immunity, floating channel tolerates negative transient voltages.
When to Replace the IRS2109
- Half-bridge stage stops switching — both gate-drive output pins dead.
- Asymmetric switching between high-side and low-side — one channel weak / dead.
- UVLO trip cascade — driver mis-reporting supply voltage.
- Visible damage — burnt or cracked driver IC package.
IRS2109 Specifications
| Parameter | Specification |
|---|---|
| Model | IRS2109 |
| Driver Type | High-Side / Low-Side MOSFET & IGBT Driver |
| High-Side Voltage | Up to +600V |
| Logic Compatibility | 3.3V / 5V / 15V |
| Gate Drive Supply Voltage | 10V to 20V |
| UVLO | Both channels |
| Output Type | Floating high-side + low-side (bootstrap) |
| Cross-Conduction Prevention | Built-in |
| Construction | Latch-immune CMOS / HVIC monolithic |
FAQ — IRS2109 Driver IC
Q: How do I confirm the IRS2109 is the failed part?
A: Probe the high-side and low-side gate output pins with a 100MHz scope while the controller tries to start. Healthy = clean rail-to-rail square waves matching the PWM input. Failed = no output, stuck-high / stuck-low, or asymmetric channels.
Q: IRS2109 vs IR2109 vs IRS21091 — are they interchangeable?
A: Same family with minor pinout differences. The "IRS2109" base variant is the 8-pin SOIC standard. Always match the silk-mark on your board exactly before substituting; pinout variation across the family is common.
Q: Rework profile?
A: Hot air at 320°C with flux paste for SOIC-8 / DIP-8. Most IRS2109 variants ship in 8-pin SOIC for production use. Through-hole DIP-8 variants exist for prototypes.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
Related products
- SLM21814 600V Half-Bridge Driver
- NSI6602B Isolated Gate Driver
- MD18623 Dual MOSFET Gate Driver
- PS21964-4S 3-Phase IGBT Power Driver Module
PSU repair benches stocking IRS2109 drivers in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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