Dual 1-Form-A Optomos 250V Smd/ Tube |Littelfuse LAA127S

LAA127S – Dual 1-Form-A OptoMOS Relay 250V, 200mA – Littelfuse

Optimize your circuit protection with the Littelfuse LAA127S, a high-reliability dual solid-state relay (SSR) designed for precise AC/DC load switching in space-constrained applications. This surface-mount OptoMOS® device delivers electrical isolation and silent operation, making it ideal for industrial automation and low-power control systems. PCX ensures genuine Littelfuse components with same-day shipping and dedicated technical support.

Key Features

• Dual SPST-NO Configuration: Two independent 1-Form-A relays in compact 8-SMD package
• Wide Load Voltage Range: 0-250V AC/DC compatibility
• Low Control Voltage: 1.2VDC input for energy-efficient operation
• 200mA Load Current with 10Ω max on-state resistance
• Industrial Temperature Range: -40°C to +85°C operation
• Certified Safety: UL, CSA, and TUV approved

Technical Specifications

This OptoMOS® relay features two optically isolated SPST-NO (Form A) circuits in an 8-SMD gull-wing package (7.62mm). The MOSFET output stage provides silent switching with zero cross-talk between channels. With a 1.2VDC control signal requirement and 250V load handling capability, it supports both AC and DC loads. The robust design withstands industrial environments (-40°C to 85°C) while maintaining signal integrity.

Typical Applications

• Industrial automation control systems
• Medical equipment instrumentation
• Telecommunication switching circuits
• Test & measurement device interfaces
• Low-power HVAC controls

About Littelfuse

Littelfuse is a global technology leader specializing in circuit protection, power control, and sensing solutions. With nearly 100 years of innovation, they set industry standards for reliability in harsh electrical environments. Their components undergo rigorous validation testing to exceed safety certifications worldwide.

The company’s OptoMOS® series represents cutting-edge solid-state relay technology, combining optocoupler isolation with MOSFET output stages. Littelfuse maintains strict quality control across all manufacturing facilities, ensuring consistent performance for critical applications from automotive to industrial IoT systems.

About Solid State Relays (SSR)

Solid-state relays provide non-mechanical switching using semiconductor technology, offering significant advantages over electromechanical relays. Unlike traditional relays with moving contacts, SSRs feature zero bounce, silent operation, and faster response times. They eliminate arcing and contact wear, resulting in longer service life and reduced maintenance.

SSRs excel in applications requiring high-cycle switching, vibration resistance, or sensitive signal environments. The optical isolation in devices like the LAA127S prevents ground loops and voltage spikes while enabling safe control of high-voltage circuits using low-voltage signals. This makes them essential for modern PCB designs across medical, industrial, and automotive sectors.

Packaging

Available in protective tube packaging for automated assembly processes. Contact PCX for reel packaging alternatives.

FAQs

Q: Can this relay switch both AC and DC loads?
A: Yes, the LAA127S supports switching of both AC and DC loads up to 250V.

Q: What is the typical lifespan of this OptoMOS relay?
A: With no moving parts, SSRs typically exceed 1 billion operations—far longer than electromechanical relays.

Q: Does it require external snubber circuits?
A: The MOSFET output has built-in protection; however, consult the datasheet for specific application recommendations.

Q: Can I parallel the channels for higher current?
A: No, channels should not be paralleled due to potential current imbalance and thermal issues.

Q: Is galvanic isolation provided between control and load circuits?
A: Yes, the optical isolation provides 3750Vrms isolation between input and output.

Q: What PCB footprint does this SMD relay use?
A: It uses a standard 8-SMD (7.62mm) gull-wing footprint; refer to the datasheet for exact dimensions.

Product image is representational; actual product may vary. Always verify specifications using the provided LAA127S datasheet.

Ready to Order?

Ensure your design’s reliability with genuine Littelfuse components! PCX guarantees authentic LAA127S OptoMOS relays with same-day shipping from our ESD-protected warehouse. Order today for guaranteed stock and priority dispatch!