KMOC3053
Zero-cross triac output photocoupler with 2500V isolation, 800V blocking voltage, and DIP-6 package for AC load switc..
Product Overview
Description
The KMOC3053 is a triac output photocoupler featuring zero-cross detection for EMI-free AC load switching.
With 800V blocking voltage and 100mA continuous load current, it can directly drive AC loads up to medium power levels.
The zero-cross switching feature minimizes EMI and extends the life of the switched load.
Product Series
KMOC
Primary Application
AC motor control
Key Features
- Zero-cross detection
- 800V blocking voltage
- 100mA load current
- 2500V isolation
- Low EMI switching
- Long load life
Specifications
| Output Type | Triac (Zero-Cross) |
|---|---|
| Isolation Voltage | 2500Vrms |
| Blocking Voltage | 800V |
| Load Current | 100mA continuous |
| Surge Current | 1A (100us) |
| Forward Voltage | 1.2V typical |
| Forward Current | 60mA max |
| Package | DIP-6 |
| Operating Temperature | -40°C to +85°C |
Applications
AC motor control
Motor drive and control systems
Heater control
Industrial automation and control
Lighting control
Industrial automation and control
Solenoid drivers
Motor drive and control systems
Home appliances
Electronic system design
FAE Expert Insights
"The KMOC3053 is my go-to recommendation for AC load switching with isolation. The zero-cross feature is a game-changer for EMI-sensitive applications. I've used this in countless heater controllers and lighting systems. The 800V blocking voltage handles 240VAC with good margin, and the 100mA continuous current is sufficient for most small to medium loads. One practical tip: always use a snubber circuit for inductive loads - I recommend 100Ω + 0.1μF. The zero-cross switching eliminates the voltage spikes that cause EMI issues with random-fire triacs. For resistive loads like heaters, this part is essentially plug-and-play reliable."
Zero-cross triac output for EMI-free AC switching with isolation
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What is zero-cross switching?
Zero-cross switching means the triac turns on only when the AC voltage crosses zero. This minimizes EMI/RFI generation and reduces stress on the load. It's ideal for resistive loads like heaters and incandescent lamps. Use non-zero-cross types (KMOC304x) for phase-control applications like dimming.
Use zero-cross for resistive loads, non-zero-cross for phase control.
What is the difference between KMOC304x and KMOC305x series?
KMOC304x series uses non-zero-cross switching, suitable for phase control applications like dimming. KMOC305x series features zero-cross detection, ideal for EMI-sensitive applications. Both provide similar isolation and current ratings.
304x for phase control, 305x for zero-cross switching.
Can KMOC3053 drive inductive loads?
Yes, KMOC3053 can drive inductive loads, but proper snubber circuit protection is required. Use RC snubber (typically 100Ω + 0.1μF) across the load to protect against voltage transients. For heavy inductive loads, consider using a larger triac with the photocoupler as trigger.
Use snubber circuits for inductive loads.
What is the dv/dt rating of KMOC3053?
The KMOC3053 has a typical dv/dt rating of 1000V/μs minimum. This ensures the triac does not false-trigger due to rapid voltage changes. For applications with high dv/dt, ensure the rating is not exceeded or use additional snubber circuits.
Verify dv/dt rating for your application.
How do I calculate the gate resistor for KMOC3053?
For triac output photocouplers, the gate current is internally limited. However, if using an external triac: R_gate = (V_trigger - 1V) / I_gate, where I_gate is the triac's gate trigger current. Ensure the photocoupler can provide sufficient current.
Internal current limiting typically sufficient.