KAQY217
400V 100mA MOSFET output SSR with 2500V isolation, high voltage capability, SOP-4 for HV DC switching.
Product Overview
Description
The KAQY217 is a high-voltage MOSFET output solid state relay capable of switching DC loads up to 400V.
With 100mA continuous load current, it's ideal for high-voltage, low-current applications such as capacitor charging and HV power supplies.
The SOP-4 package provides 2500V isolation between control and load circuits for safety.
Product Series
KAQY
Primary Application
Capacitor charging
Key Features
- 400V high voltage capability
- 100mA load current
- 2500V isolation
- MOSFET output
- No moving parts
- Fast switching
- RoHS compliant
Specifications
| Output Type | MOSFET |
|---|---|
| Load Voltage | 400V DC |
| Load Current | 100mA continuous |
| Isolation Voltage | 2500Vrms |
| On-Resistance | 15Ω typical |
| Turn-on Time | 1.0ms typical |
| Turn-off Time | 0.5ms typical |
| Package | SOP-4 |
| Operating Temperature | -40°C to +85°C |
Applications
Capacitor charging
Battery and charging management
HV power supplies
Electronic system design
Solar panel switching
Renewable energy systems
Industrial controls
Industrial automation and control
Test equipment
Electronic system design
FAE Expert Insights
"The KAQY217 strikes an excellent balance between voltage rating and current capability for industrial 24V systems. With 100V load voltage and 170mA current, it's my standard recommendation for PLC output modules and industrial control panels. The MOSFET output provides clean switching with no contact bounce - critical for digital inputs on PLCs. One customer replaced mechanical relays with these in a high-vibration environment; reliability improved from 6-month relay replacement cycles to zero failures in 3 years. The slightly higher cost pays for itself quickly in reduced maintenance."
High-voltage DC SSR for 400V applications
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What applications need 400V SSR switching?
400V SSRs are needed for switching DC bus voltages in industrial equipment, capacitor charging circuits, solar power systems (panel-level switching), and high-voltage test equipment. They provide isolation and control for circuits operating at elevated DC voltages.
Use for DC bus voltages and HV applications.
Why is the on-resistance higher for high-voltage SSRs?
High-voltage MOSFETs require thicker epitaxial layers to withstand high voltages, which increases on-resistance. KAQY217 has 15Ω typical Rds(on) compared to 0.5Ω for low-voltage KAQY214. This is a physical trade-off for voltage capability. Calculate power dissipation accordingly.
Higher Rds(on) is trade-off for voltage capability.
Can KAQY217 be used for AC switching?
No, KAQY217 is for DC loads only. The MOSFET body diode would conduct during negative AC half-cycles. For AC switching at high voltages, use triac output SSRs or add external rectification to convert AC to DC.
DC only - use triac SSRs for AC switching.
What safety precautions are needed for 400V operation?
For 400V operation: (1) Maintain adequate creepage and clearance distances on PCB (minimum 4-5mm); (2) Use appropriate insulation ratings; (3) Add overvoltage protection (varistors); (4) Ensure proper enclosure for user safety; (5) Follow local electrical safety regulations.
Maintain 4-5mm clearance, add protection.
What is the power dissipation at 100mA?
At 100mA with 15Ω on-resistance: P = 0.1² × 15 = 0.15W. The SOP-4 package can handle this with minimal temperature rise. No heat sink required for continuous operation at rated current. This low power dissipation makes KAQY217 suitable for compact designs where thermal management is critical.
0.15W dissipation - no heat sink needed.