Product Overview
The SD68C128TJ-15 is a high-speed phototransistor optocoupler with a collector-emitter voltage rating of 80V, designed for high-voltage isolation and signal transmission applications. This device features an infrared LED input optically coupled to a high-voltage silicon phototransistor, packaged in a compact SOP-5 surface-mount package. The 150% minimum current transfer ratio (CTR) ensures reliable signal detection across a wide operating temperature range. It is commonly used in switch-mode power supplies, industrial control systems, and high-voltage sensing circuits requiring both high isolation voltage and high output voltage capability.
Key Specifications
| Type | High-Voltage Phototransistor Optocoupler |
| Input Side | GaAs Infrared LED |
| Output Side | High-Voltage NPN Phototransistor |
| Isolation Voltage (VISO) | 5000 Vrms (1 min) |
| Current Transfer Ratio (CTR) | 150% min at IF=5mA, VCE=5V |
| Collector-Emitter Voltage (VCEO) | 80 V min |
| Collector-Base Voltage (VCBO) | 110 V min |
| Emitter-Collector Voltage (VECO) | 7 V |
| Saturation Voltage (VCE(sat)) | 0.3 V max at IF=8mA, IC=2.4mA |
| Switching Time (tr/tf) | 5µs / 10µs typical |
| Package | SOP-5 (Surface Mount) |
| Operating Temperature | -55°C ~ +110°C |
Features
- High collector-emitter voltage: 80V
- 5000Vrms electrical isolation
- High CTR: 150% minimum
- Compact SOP-5 surface-mount package
- Low saturation voltage
- UL1577 and VDE approved
- RoHS compliant and halogen-free
- Enhanced CTR linearity over temperature
- Creepage distance > 7mm
- High insulation reliability
Applications
- High-voltage switch-mode power supplies
- Offline flyback converter feedback
- High-voltage sensing and monitoring
- Industrial control system isolation
- Programmable logic controllers
- Solid state relays
- Telecom power systems
- Medical equipment isolation