TLP185 surface-mount optocoupler SOP-4

TLP185 Surface-Mount Optocoupler SOP-4 is a high-performance photo-transistor type optocoupler housed in a compact SOP-4 package. It is commonly used for signal isolation in digital interfaces, microcontroller circuits, and power electronics. Featuring high isolation voltage and fast switching capabilities, it is ideal for space-constrained applications requiring reliable electrical isolation.

Key Features:

• Compact SOP-4 Package: Suitable for surface-mount PCB applications.
• High Isolation Voltage: Withstands isolation voltage up to 3750 Vrms.
• Low Input Current: Operates efficiently with low forward current.
• Fast Switching: Ideal for high-speed digital signal transmission.
• RoHS Compliant: Environmentally friendly and lead-free component.

Technical Specifications:

• Input Type: Infrared LED
• Output Type: NPN Phototransistor
• Isolation Voltage: 3750 Vrms (1 minute)
• CTR (Current Transfer Ratio): 50% to 600% (IF = 5mA, VCE = 5V)
• Forward Voltage: 1.2V (typical) at IF = 20mA
• Collector-Emitter Voltage: 80V (maximum)
• Collector Current: 50mA (maximum)
• Power Dissipation: 150mW (maximum)

Mechanical Specifications:

• Package Type: SOP-4 (Small Outline Package, 4 pins)
• Lead Pitch: 1.27mm
• Package Material: Molded plastic with flame retardant epoxy
• Dimensions: Approx. 4.6mm × 4.4mm × 2.1mm

Mounting Options:

• Surface-Mount: Designed for SMT (Surface Mount Technology) assembly.
• Compatible with Reflow Soldering: Supports automated SMD processes.

Schematic Diagram, Connection, Wiring and Pinout:

• Pin Configuration: Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (Emitter), Pin 4 (Collector)
• Connection: LED input side connected to logic/microcontroller; phototransistor side to load or detection circuit.
• Wiring: Ensure correct orientation to maintain functional isolation and switching behavior.

Datasheet and Documentation:

• Download TLP185 Datasheet (PDF)

Applications:

• Signal Isolation: Digital interfaces in microcontroller and logic circuits.
• Switching Power Supplies: Feedback and signal isolation in SMPS designs.
• AC Load Switching: Used in triac driver or MOSFET driver circuits.
• Home Appliances: Circuit protection and isolation for embedded control systems.
• Industrial Controls: Isolating signals in automation and safety applications.

Equivalent Models:

• PC817: Widely used optocoupler with similar electrical specs
• EL817: Compact, reliable optoisolator with SOP options
• LTV-817S: SOP-4 compatible package with similar CTR
• FOD817SD: Fairchild equivalent with similar characteristics

Package Includes:

• 1 x TLP185 Surface-Mount Optocoupler SOP-4