KAQ214A
AEC-Q100 Grade 1 qualified 60V 400mA MOSFET output SSR for automotive DC load switching.
Product Overview
Description
The KAQ214A is an automotive-grade MOSFET output solid state relay for DC load switching in vehicle applications.
Capable of switching DC loads up to 60V and 400mA with low on-resistance and AEC-Q100 Grade 1 qualification.
Ideal for battery management, LED lighting, and DC motor control in automotive systems.
Product Series
KAQ
Primary Application
Battery management
Key Features
- 400mA DC switching
- Low on-resistance 0.5Ω
- AEC-Q100 Grade 1
- 60V load voltage
- Fast switching
- Unlimited life
- RoHS compliant
Specifications
| Output Type | MOSFET |
|---|---|
| Load Voltage | 60V DC |
| Load Current | 400mA continuous |
| Isolation Voltage | 2500Vrms |
| On-Resistance | 0.5Ω typical |
| Turn-on Time | 0.5ms typical |
| Turn-off Time | 0.1ms typical |
| Package | SOP-4 |
| Operating Temperature | -40°C to +125°C |
| Qualification | AEC-Q100 Grade 1 |
| PPAP | Level 3 available |
Applications
Battery management
Battery and charging management
LED lighting control
Industrial automation and control
DC motor switching
Motor drive and control systems
Automotive sensors
Sensor signal conditioning
Power distribution
Electronic system design
FAE Expert Insights
"The KAQ214A automotive SSR provides silent, reliable DC switching for vehicle electronics. The 400V rating handles the voltage transients common in automotive electrical systems. I've specified this in lighting control modules and power distribution systems. The unlimited switching life is a major advantage over mechanical relays in high-cycling applications like turn signals. The automotive qualification includes the enhanced testing required for vehicle applications. Design consideration: verify your heat sinking design for continuous operation at maximum current."
Automotive MOSFET SSR for DC load switching
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What automotive DC loads can KAQ214A switch?
KAQ214A can switch DC loads up to 60V and 400mA. Common automotive applications: (1) LED lighting (interior, exterior); (2) Small DC motors (mirrors, locks); (3) Battery cell balancing; (4) Sensor power switching; (5) Low-power heater elements. Calculate power dissipation for thermal design.
Up to 60V 400mA DC loads - LEDs, motors, etc.
What is the power dissipation at rated current?
At 400mA with 0.5Ω on-resistance: P = I²R = 0.4² × 0.5 = 0.08W. This low dissipation allows continuous operation without heat sink in most conditions. At high ambient temperatures (>100°C), ensure adequate PCB copper area for heat spreading.
0.08W at rated current - minimal heating.
Can KAQ214A be used for 12V automotive systems?
Yes, KAQ214A is ideal for 12V automotive systems. The 60V rating provides excellent margin for 12V operation (including load dump transients up to 40V). The 400mA current handles most 12V loads. For 48V mild-hybrid systems, the 60V rating is also adequate.
Excellent for 12V and 48V automotive systems.
How does KAQ214A compare to mechanical relays?
Advantages: (1) Unlimited switching life; (2) Silent operation; (3) Fast <1ms switching; (4) No contact bounce; (5) No arcing; (6) Smaller size. Trade-offs: (1) 0.2V drop at 400mA; (2) Generates some heat; (3) DC only (no AC switching). For high-frequency switching, SSRs are superior.
SSRs excel in high-frequency, long-life applications.
What protection is needed for automotive applications?
For automotive use: (1) Transient protection (TVS diodes) for load dump; (2) Reverse polarity protection; (3) Current limiting for LED loads; (4) Thermal management for continuous operation. The SSR itself has internal protection, but external components ensure system-level reliability.
Add TVS, reverse polarity, and current limiting.