KRE1A05
5V coil SPST reed relay with 200V 0.5A switching, 1000V isolation, SIP package for general-purpose switching.
Product Overview
Description
The KRE1A05 is a compact SPST reed relay featuring a 5V DC coil and hermetically sealed reed switch.
Capable of switching up to 200V and 0.5A, suitable for general-purpose low-power switching applications.
The SIP package is ideal for PCB mounting and automated assembly processes.
Product Series
KRE
Primary Application
Test equipment
Key Features
- Hermetically sealed contacts
- Long life >100M operations
- Low contact resistance <100mΩ
- 1000V coil-contact isolation
- Compact SIP package
- Low coil power 50mW
- RoHS compliant
Specifications
| Contact Form | SPST-NO |
|---|---|
| Coil Voltage | 5V DC |
| Coil Resistance | 500Ω typical |
| Switching Voltage | 200V DC/AC |
| Switching Current | 0.5A |
| Carry Current | 1.0A |
| Contact Rating | 10W |
| Isolation Voltage | 1000Vrms |
| Operate Time | 1.0ms typical |
| Release Time | 0.5ms typical |
| Package | SIP-4 |
| Operating Temperature | -40°C to +85°C |
Applications
Test equipment
Electronic system design
Medical devices
Medical electronics
Security systems
Electronic system design
Telecommunications
Communication and interface
Industrial controls
Industrial automation and control
FAE Expert Insights
"The KRE1A05 reed relay is my go-to for low-level signal switching. The 5V coil is compatible with most logic systems, and the hermetically sealed contacts provide excellent reliability. I particularly appreciate the low contact resistance (less than 100mΩ) for sensitive measurements. One key application: switching thermocouple signals in temperature measurement systems. The isolation between coil and contacts is excellent. Design tip: always include a flyback diode across the coil to protect your drive circuit from inductive kickback. The 1 Form A (SPST-NO) configuration handles most simple switching needs."
Reliable reed relay with hermetically sealed contacts
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What is the typical life expectancy of KRE1A05?
KRE1A05 reed relays typically achieve >100 million operations at rated load, and >1 billion operations at low-level loads (10mA, 10mV). The hermetically sealed contacts prevent contamination, ensuring consistent performance over the relay's lifetime.
100M+ operations at rated load, 1B+ at low level.
Can KRE1A05 switch AC signals?
Yes, KRE1A05 can switch both AC and DC signals up to 200V. The reed switch is polarity-independent, making it suitable for AC applications. For AC switching, ensure the voltage and current ratings are not exceeded.
Switches both AC and DC up to 200V.
What is the contact resistance of KRE1A05?
Initial contact resistance is typically <100mΩ. Over the relay's life, contact resistance may increase slightly but should remain below 200mΩ. Low contact resistance ensures minimal signal attenuation and voltage drop.
<100mΩ initial, <200mΩ over life.
Does KRE1A05 require a coil suppression diode?
Yes, always use a flyback diode across the coil to suppress voltage spikes when the relay turns off. Without protection, the inductive kickback can damage driving circuits. A standard 1N4148 or 1N4001 diode is sufficient.
Always use flyback diode for coil protection.
What is the difference between reed relays and EMRs?
Reed relays use hermetically sealed reed switches with no moving parts except the contacts, providing longer life and better environmental sealing. EMRs (electromechanical relays) have exposed contacts and mechanical armatures, offering higher current capacity but shorter life and larger size.
Reed relays for long life/sealing, EMRs for high current.