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Product Detailed Parameters
- Description：DARLINGTON OUTPUT OPTOCOUPLER
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Number of Channels：-
- Voltage - Isolation：-
- Current Transfer Ratio (Min)：-
- Current Transfer Ratio (Max)：-
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：-
- Input Type：-
- Output Type：-
- Voltage - Output (Max)：-
- Current - Output / Channel：-
- Voltage - Forward (Vf) (Typ)：-
- Current - DC Forward (If) (Max)：-
- Vce Saturation (Max)：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The TIL189-1 is a photovoltaic output optocoupler manufactured by Texas Instruments. It consists of an aluminum gallium arsenide (AlGaAs) infrared LED coupled to a photovoltaic detector. The device provides electrical isolation between input and output circuits without requiring external bias voltage on the output side, relying instead on generated photocurrent. This configuration supports high-voltage isolation capabilities suitable for sensitive signal transmission applications where galvanic separation is required.
Feature Summary
- Photovoltaic output architecture eliminates need for external output bias supply
- AlGaAs infrared LED source ensures stable optical coupling efficiency
- High isolation voltage rating protects low-voltage control circuits from high-potential hazards
Applications
- Solid-state relay driver circuits
- Microprocessor system isolation interfaces
- Medical equipment signal isolation
Procurement Notes
Verify RoHS compliance status as historical documentation indicates non-compliance. Confirm package type availability matches design requirements. Check manufacturer lifecycle status to ensure long-term supply stability. Validate datasheet revision against current production specifications before finalizing component selection for new designs.
Selection Notes
Select this component when zero-bias output operation is necessary. Consider the trade-off between output drive capability and isolation complexity. Ensure input current limits are respected to maintain LED longevity. Verify that the generated photocurrent meets the downstream load requirements without additional amplification stages.
Part Context
The TIL189-1 belongs to Texas Instruments' legacy optocoupler portfolio. It represents a standard solution for basic galvanic isolation tasks. The device predates modern high-speed digital isolators but remains relevant for simple analog or low-frequency digital switching applications requiring robust electrical separation.
Replacement Considerations
Direct pin-compatible replacements may be limited due to age. Evaluate newer photovoltaic optocouplers from other manufacturers if supply constraints exist. Ensure replacement parts match isolation voltage ratings and input-output capacitance specifications.
