KAQ6N138A
AEC-Q100 Grade 1 qualified 10Mbps high-speed photocoupler for automotive communication isolation.
Product Overview
Description
The KAQ6N138A is a high-speed photocoupler qualified to AEC-Q100 Grade 1 for automotive communication applications.
Supports data rates up to 10Mbps with excellent CMTI performance for reliable operation in noisy automotive environments.
Ideal for isolated CAN bus, LIN bus, and other automotive communication protocols.
Product Series
KAQ
Primary Application
Isolated CAN bus
Key Features
- 10 Mbps high speed
- AEC-Q100 Grade 1
- High CMTI 15kV/us
- Low propagation delay
- Automotive temp range
- SOP-8 package
- RoHS compliant
Specifications
| Output Type | Open Collector |
|---|---|
| Isolation Voltage | 2500Vrms |
| Data Rate | 10 Mbps |
| Propagation Delay | 0.5us typical |
| CMTI | 15kV/us min |
| Forward Voltage | 1.4V typical |
| Forward Current | 20mA max |
| Package | SOP-8 |
| Operating Temperature | -40°C to +125°C |
| Qualification | AEC-Q100 Grade 1 |
| PPAP | Level 3 available |
Applications
Isolated CAN bus
Communication and interface
LIN bus isolation
Electronic system design
Automotive Ethernet
Automotive and EV electronics
High-speed communication
Communication and interface
Gateway modules
Electronic system design
FAE Expert Insights
"For high-speed automotive communication isolation, the KAQ6N138A is excellent. The 10Mbps capability handles CAN and other automotive protocols with margin. The automotive qualification includes the enhanced reliability testing required for vehicle applications. I've specified this in gateway modules and BMS communication interfaces. The high CMTI (25kV/μs) is crucial in the noisy automotive electrical environment. Design recommendation: use automotive-grade decoupling capacitors and follow OEM PCB layout guidelines for optimal performance."
10Mbps automotive photocoupler for communication isolation
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What communication protocols can KAQ6N138A support?
KAQ6N138A supports: (1) CAN bus up to 1Mbps (including CAN-FD); (2) LIN bus at 20kbps; (3) UART/RS-232 up to 115kbps; (4) SPI up to 10Mbps; (5) General digital isolation. The 10Mbps capability covers most automotive communication needs.
Supports CAN, LIN, UART, SPI up to 10Mbps.
What is CMTI and why is it important in automotive?
CMTI (Common Mode Transient Immunity) measures ability to reject fast voltage transients between input and output. Automotive environments have high electrical noise from ignition, fuel injectors, and motor drives. 15kV/us CMTI ensures reliable communication despite this noise.
High CMTI critical for automotive noise immunity.
Can KAQ6N138A be used for isolated ADC SPI interfaces?
Yes, KAQ6N138A is excellent for isolated SPI interfaces to ADCs. The 10Mbps speed supports high-sample-rate ADCs, and the low propagation delay maintains timing integrity. Use one photocoupler per SPI signal (SCLK, MOSI, MISO, CS) for complete isolation.
Excellent for isolated SPI to ADCs.
What is the typical application circuit for CAN isolation?
For CAN isolation: (1) Connect TX from MCU to photocoupler input; (2) Photocoupler output to CAN transceiver TX; (3) Repeat for RX path; (4) Use pull-up resistors on outputs; (5) Add bypass capacitors; (6) Ensure proper grounding. This provides galvanic isolation for the CAN bus.
Isolate both TX and RX paths for complete isolation.
How does temperature affect propagation delay?
Propagation delay increases slightly at temperature extremes. At -40°C, delay may decrease 10-15%. At +125°C, delay may increase 15-20%. This variation is accounted for in the datasheet max specifications. For critical timing, design with margin for temperature variation.
±20% variation over temperature - design with margin.