LAA127 Series DPST (2 Form A) 200 mA 10 O Surface Mount Solid State Relay DIP-8

LAA127STR – DPST Solid State Relay 200mA 250V – Littelfuse OptoMOS®

The Littelfuse LAA127STR is a high-reliability surface-mount solid state relay (SSR) featuring dual SPST-NO (DPST) configurations. Designed for low-power switching, it offers silent operation, zero bounce, and extended lifespan compared to mechanical relays—ideal for precision control in space-constrained applications. PCX ensures genuine Littelfuse components with same-day shipping and dedicated technical support.

Key Features

• Configuration: DPST (2 Form A) SPST-NO channels
• Load Capacity: 200mA AC/DC, 0–250V
• Input Voltage: 1.2VDC control signal
• Low Resistance: 10Ω max on-state resistance
• Temperature Range: -40°C to +85°C operation
• Approvals: CSA, TUV, UL certified

Technical Details

This OptoMOS® SSR uses infrared LED optical coupling to isolate input and output circuits, eliminating EMI interference. The gull-wing termination style enables secure surface mounting on PCBs, while the compact 8-SMD package (7.62mm width) saves board space. Its 1.2VDC input voltage simplifies integration with low-voltage microcontrollers or logic circuits.

Typical Applications

• Medical device control systems
• Industrial automation sensors
• Test & measurement equipment
• Telecommunication infrastructure
• Low-power HVAC controls

About Littelfuse

Littelfuse is a global leader in circuit protection and power control technologies, serving critical industries for over 95 years. Their OptoMOS® series sets industry standards for reliability in solid-state switching, leveraging advanced semiconductor designs to ensure consistent performance under demanding conditions.

Renowned for rigorous quality certifications (including ISO/TS 16949), Littelfuse components undergo exhaustive validation for thermal stability, surge tolerance, and longevity. This commitment positions them as a trusted partner for safety-critical electronics where failure is not an option.

About Solid State Relays (SSRs)

Solid state relays use semiconductor switching elements instead of mechanical contacts, enabling silent, spark-free operation with no moving parts. This eliminates contact wear, reduces EMI, and provides sub-millisecond response times—crucial for high-cycle applications where precision and durability are paramount.

SSRs excel in environments sensitive to electrical noise or vibration, such as medical instruments, PLC systems, and IoT devices. Their optical isolation protects control circuits from load-side voltage spikes, enhancing system safety while enabling compact designs unachievable with electromechanical relays.

Packaging Options

Available in Tape & Reel (TR), Cut Tape (CT), or Digi-Reel® formats for flexible production scaling. Specify preferred packaging during checkout.

FAQs

Q: Can this SSR switch AC and DC loads simultaneously?
A: Yes, each channel independently handles AC or DC loads up to 250V/200mA.

Q: Is an external heatsink required?
A: No—the 10Ω on-state resistance and 200mA rating allow passive cooling in most applications.

Q: What’s the typical lifespan of this SSR?
A: OptoMOS® SSRs typically exceed 1 billion operations due to contactless switching.

Q: Does it support logic-level triggering?
A: Yes, the 1.2VDC input works with 1.8V/3.3V/5V microcontroller GPIO pins.

Q: How does optical isolation improve safety?
A: It creates a 3750Vrms barrier between input/output circuits, preventing fault propagation.

Q: Are PCX components traceable to the manufacturer?
A: Absolutely—all PCX inventory is sourced directly from Littelfuse with full lot-code traceability.

⚠️ Product image is representational; refer to datasheet for exact dimensions.
Download Full Datasheet

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