Littelfuse Launches CPC1343G OptoMOS Solid-State Relay for High-Current, High-Isolation Applications
March 20, 2026
Littelfuse’s CPC1343G OptoMOS Solid-State Relay is Designed for High-Reliability Switching in Demanding Industrial, Medical & Instrumentation Applications
New 60 V, 900 mA normally open SSR delivers 5000 VRMS reinforced isolation and reliable operation up to +105 °C in compact DIP-4 and SMD packages.
Littelfuse has announced the launch of the CPC1343G OptoMOS Solid-State Relay, a compact, normally open (1-Form-A) OptoMOS relay designed for high-reliability switching in demanding industrial, medical, and instrumentation applications.
Built on Littelfuse OptoMOS technology, the CPC1343G combines 900 mA continuous load current, 60 V blocking voltage, and reinforced 5000 VRMS input-to-output isolation designed to meet stringent safety and compliance requirements in a space-saving 4-pin package. Fast switching performance—4 ms turn-on and 1 ms turn-off—enables precise control in modern electronic systems, while a low 3 mA maximum LED drive current ensures compatibility with TTL and CMOS logic without added interface circuitry.
Designed for harsh operating environments, the CPC1343G supports an extended ambient temperature range of –40 °C to +105 °C, exceeding the +85 °C limit common to many competing SSRs. Its solid-state construction eliminates mechanical wear, delivering silent, maintenance-free operation and long-term reliability where electromechanical relays often fall short.
Optimized for Safety, Efficiency & Space-Constrained Designs
With a maximum on-resistance of 0.8 Ω, the CPC1343G minimizes power dissipation and improves thermal performance at higher load currents. The device is offered in both through-hole DIP-4 and surface-mount configurations, simplifying PCB layout and enabling flexible manufacturing options across industrial and medical platforms.
With the launch of the CPC1343G, we’re giving our customers a high-performance solid-state relay that combines reinforced isolation, fast switching, and extended temperature capability. This solution addresses critical reliability and safety challenges in space-constrained designs, helping engineers reduce maintenance, improve system robustness, and accelerate time to market.
Dr. Hugo Guzman, Product Marketing Manager at Littelfuse
Package & Ordering Options
The CPC1343G family includes multiple package options optimized for different assembly and volume requirements:
| Part Number | Package Type | Mounting Style | Packaging Format | Typical Use Case |
|---|---|---|---|---|
| CPC1343G | DIP-4 | Through-hole | Tube (100) | Prototyping, industrial control boards |
| CPC1343GR | DIP-4 | Surface mount | Tube (100) | Low-volume SMT production |
| CPC1343GRTR | DIP-4 | Surface mount | Tape & reel (1,000) | Automated, high-volume SMT lines |
Target Markets & Applications
The CPC1343G is ideally suited for applications requiring high isolation, fast response, and reliable operation at elevated temperatures, including:
- Industrial control systems and automation
- Medical equipment requiring patient-to-equipment isolation
- Instrumentation, data acquisition, and multiplexing
- Automatic test equipment (ATE)
- Utility and smart metering systems
By combining high-load-current capability, reinforced isolation, and compact packaging, the CPC1343G expands the Littelfuse OptoMOS portfolio and provides designers with a compliance-ready switching solution for next-generation electronic systems.
FAQs: Learn More About These High-Current Optomos Solid-State Relays
- What Makes the CPC1343G Different from Traditional Electromechanical Relays?
Unlike electromechanical relays, the CPC1343G has no moving parts, enabling silent, maintenance-free operation with faster switching, higher isolation, and improved reliability at elevated temperatures. - How Does the CPC1343G Compare to Competing Solid-State Relays?
It delivers higher continuous load current (900 mA vs. ~550 mA), lower on resistance (0.8 Ω vs. ~2.5 Ω), and operation up to +105 °C, providing better thermal performance and energy efficiency. - Is the CPC1343G Compatible with Low-Power Control Logic?
Yes. The device requires a maximum LED drive current of just 3 mA, making it fully compatible with TTL and CMOS logic without the need for additional drivers. - What Applications Benefit Most from the CPC1343G’s Reinforced Isolation?
Medical equipment, industrial controls, instrumentation, and metering applications benefit from the 5000 VRMS reinforced isolation, which supports stringent safety and regulatory requirements. - What Packaging Options are Available?
The CPC1343G is available in through-hole DIP-4 and surface-mount packages, including tape-and-reel options for automated, high-volume production.
Availability
Depending on the selected package, these solid-state relays are available in quantities of 100 per tube or 1,000 per reel. Sample requests are accepted through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.
For More Information
Additional information is available on the CPC1343G Solid-State Relays product page. For technical questions, please contact:
- Hugo Guzman, Product Marketing Manager: hguzman@littelfuse.com
- Juste Valentiniene, Product Manager: jvalentiniene@littelfuse.com
- Anthony Konopka, Product Marketing Engineer: akonopka@littelfuse.com
For more information on Littelfuse solutions HERE
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