KAQ5010A
AEC-Q100 Grade 1 qualified Darlington output photocoupler with high CTR 100-300% for automotive.
Product Overview
Description
The KAQ5010A is an automotive-grade Darlington output photocoupler providing high current gain for low-drive applications.
Features AEC-Q100 Grade 1 qualification with CTR of 100-300% over the full automotive temperature range.
Ideal for interfacing with automotive microcontrollers and low-current drive sources.
Product Series
KAQ
Primary Application
MCU interfacing
Key Features
- Darlington high gain output
- AEC-Q100 Grade 1
- High CTR 100-300%
- Low input current need
- Automotive temp range
- PPAP support
- RoHS compliant
Specifications
| Output Type | Darlington |
|---|---|
| Isolation Voltage | 2500Vrms |
| CTR | 100-300% (automotive grade) |
| Forward Voltage | 1.2V typical |
| Forward Current | 60mA max |
| Collector-Emitter Voltage | 35V |
| Package | SOP-6 |
| Operating Temperature | -40°C to +125°C |
| Qualification | AEC-Q100 Grade 1 |
| PPAP | Level 3 available |
Applications
MCU interfacing
Electronic system design
Low-drive applications
Motor drive and control systems
Sensor isolation
Sensor signal conditioning
Battery monitoring
Battery and charging management
Automotive controls
Industrial automation and control
FAE Expert Insights
"The KAQ5010A brings Darlington output performance to automotive applications. The high CTR (100-300%) is valuable when driving from microcontroller pins with limited current sourcing capability. I've used this in body control modules and HVAC systems. The automotive qualification includes enhanced temperature cycling and humidity testing. One practical advantage: the higher gain allows direct driving of small relays or lamps without additional transistors, simplifying the BOM. Design tip: account for the higher saturation voltage in your load calculations."
High-gain Darlington photocoupler for automotive MCU interfacing
— Senior FAE Team, BeiLuo
Frequently Asked Questions
When should I use Darlington vs standard transistor output?
Use Darlington when: (1) Drive current is limited (MCU GPIO); (2) Higher output current needed; (3) Input current must be minimized. Use standard transistor when: (1) Switching speed is critical; (2) Lower saturation voltage needed; (3) Cost is primary concern.
Darlington for gain, transistor for speed.
What is the trade-off of Darlington output?
Darlington provides higher CTR (100-300% vs 50-300%) but has trade-offs: (1) Higher saturation voltage (~1V vs 0.2V); (2) Slower switching speed; (3) Lower VCEO rating (35V vs 80V). Consider these factors for your specific application requirements.
Higher gain but slower and higher Vsat.
Can KAQ5010A be driven directly from 3.3V MCU?
Yes, KAQ5010A can be driven from 3.3V MCU. The high CTR means lower LED current is needed for the same output current. Calculate resistor: R = (3.3V - 1.2V) / If. With 5mA LED current, you get equivalent output to 10mA in standard photocouplers.
Yes - high CTR reduces input current requirement.
What automotive applications need Darlington photocouplers?
Common applications include: (1) Battery cell monitoring (low current drive); (2) Sensor signal isolation; (3) MCU interfacing with limited GPIO current; (4) Low-power automotive controls. Any application where drive current is limited benefits from Darlington's high gain.
Use for low-drive automotive isolation needs.
Is the switching speed adequate for CAN bus isolation?
Darlington photocouplers are generally too slow for CAN bus (1Mbps). Use high-speed photocouplers like KAQ6N138A for CAN bus. Darlington types are suitable for slower signals: status indication, control signals, and low-speed communication (<100kbps).
Too slow for CAN - use high-speed types.