KRE2A05
5V coil SPDT reed relay with 200V 0.5A switching, 1000V isolation, SIP package for changeover applications.
Product Overview
Description
The KRE2A05 is an SPDT (changeover) reed relay providing both normally open and normally closed contacts.
The 5V coil and compact SIP package make it ideal for applications requiring changeover switching.
Hermetically sealed contacts ensure reliable operation in various environments.
Product Series
KRE
Primary Application
Signal routing
Key Features
- SPDT changeover contacts
- 5V coil operation
- Hermetically sealed
- Long life >50M operations
- 1000V isolation
- Compact SIP-6 package
- RoHS compliant
Specifications
| Contact Form | SPDT (1 Form C) |
|---|---|
| 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-6 |
| Operating Temperature | -40°C to +85°C |
Applications
Signal routing
Sensor signal conditioning
Test switching matrices
Electronic system design
Audio switching
Electronic system design
Data acquisition
Data acquisition and conversion
Communication systems
Communication and interface
FAE Expert Insights
"When you need two independent switches in one package, the KRE2A05 is the perfect solution. The dual 1 Form A configuration saves PCB space and reduces component count. I've used this in data acquisition systems where multiple channels need simultaneous switching. Both relays share the same coil, so they switch together - useful for differential signal switching. The isolation between the two reed switches is excellent, preventing crosstalk between channels. Design tip: the coil current is slightly higher than single relays, so ensure your drive circuit can handle the load."
SPDT reed relay for changeover switching applications
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What is the contact sequence in SPDT reed relays?
SPDT reed relays use break-before-make contact sequence. The normally closed contact opens before the normally open contact closes. This prevents momentary shorting of the two circuits being switched. The break time is typically 0.1-0.2ms.
Break-before-make prevents circuit shorting.
Can both contacts carry current simultaneously?
No, the SPDT contacts are mutually exclusive - only one contact is closed at a time. When the coil is energized, the NO contact closes and NC opens. When de-energized, the NC contact closes and NO opens. They cannot both be closed simultaneously.
Contacts are mutually exclusive - only one closed at a time.
What applications benefit from SPDT reed relays?
Common SPDT applications include: (1) Signal routing between two paths; (2) Bypass switching; (3) Fail-safe circuits; (4) Test system switching matrices; (5) Audio source selection. The changeover capability provides flexibility in circuit design.
Use for routing, bypass, and selection applications.
Is there contact bounce in reed relays?
Reed relays have minimal contact bounce compared to EMRs. Typical bounce time is <1ms. This makes them suitable for switching sensitive digital circuits without additional debouncing. The hermetic seal also prevents contact contamination that could cause erratic contact resistance.
Minimal bounce - suitable for digital circuits.
What is the life expectancy of SPDT vs SPST reed relays?
SPDT reed relays typically have slightly lower life expectancy than SPST due to more complex reed switch construction. Expect >50M operations for SPDT vs >100M for SPST at rated load. For low-level switching, both types achieve >1B operations.
SPDT: >50M, SPST: >100M at rated load.