KRE5A05
5V coil high-frequency reed relay with 200V 0.5A, optimized for fast switching up to 500Hz, SIP package.
Product Overview
Description
The KRE5A05 is optimized for high-frequency switching applications with enhanced reed switch design.
Capable of switching up to 500Hz while maintaining long contact life and reliable operation.
The optimized design reduces contact bounce and improves switching consistency at high rates.
Product Series
KRE
Primary Application
High-speed test systems
Key Features
- 500Hz switching frequency
- Fast operate/release
- Low contact bounce
- Hermetically sealed
- 200V switching
- Optimized for speed
- RoHS compliant
Specifications
| Contact Form | SPST-NO |
|---|---|
| Coil Voltage | 5V DC |
| Coil Resistance | 250Ω typical |
| Switching Voltage | 200V DC/AC |
| Switching Current | 0.5A |
| Carry Current | 1.0A |
| Contact Rating | 10W |
| Max Switching Frequency | 500Hz |
| Isolation Voltage | 1000Vrms |
| Operate Time | 0.5ms typical |
| Release Time | 0.3ms typical |
| Package | SIP-4 |
| Operating Temperature | -40°C to +85°C |
Applications
High-speed test systems
Electronic system design
Rapid switching
Electronic system design
Automated test equipment
Electronic system design
Data acquisition
Data acquisition and conversion
Production testing
Electronic system design
FAE Expert Insights
"For high-voltage signal switching, the KRE5A05 is my recommendation. The enhanced insulation and contact spacing handle higher voltages safely. I've used this in high-voltage test equipment and power supply monitoring circuits. The 5V coil is compatible with standard logic levels. One important consideration: at high voltages, contact arcing can occur if switching inductive loads. For purely resistive or capacitive loads, this relay performs excellently. Always verify your voltage and current requirements against the datasheet specifications."
High-frequency reed relay for 500Hz switching applications
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What limits reed relay switching frequency?
Switching frequency is limited by: (1) Reed blade mechanical resonance; (2) Contact bounce time; (3) Coil magnetic field buildup/decay; (4) Contact erosion at high frequency. KRE5A05 optimizes these factors for 500Hz operation vs 100Hz for standard relays.
Mechanical and magnetic factors limit frequency.
Does high-frequency switching reduce relay life?
Life at high frequency depends on load conditions. At low-level loads (dry switching), life remains high even at 500Hz. At rated loads, high-frequency operation increases contact erosion. For maximum life at high frequency, switch lower currents or use solid-state relays.
Life depends on load - lower current for longer life.
What driver circuit is recommended for 500Hz operation?
For 500Hz operation, use a fast coil driver with: (1) Quick current buildup (low coil resistance); (2) Fast current decay (active clamp or Zener diode); (3) Adequate drive current. Standard flyback diodes slow release time - use Zener or TVS for faster switching.
Use fast driver with active clamp for high frequency.
Can KRE5A05 be used for PWM applications?
While KRE5A05 can switch at 500Hz, it's not ideal for PWM due to mechanical limitations. The contact bounce and finite operate/release times create timing uncertainty. For PWM applications, use solid-state relays which provide precise, bounce-free switching.
Not ideal for PWM - use SSRs for PWM applications.
What is the contact bounce time at high frequency?
KRE5A05 has optimized contact bounce of <0.5ms, compared to <1ms for standard reed relays. This reduced bounce is through reed blade material and geometry optimization. The lower bounce allows faster settling and higher switching rates.
<0.5ms bounce - optimized for high speed.