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TLP121-1 from TOSHIBA

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TLP121-1

Manufacturer: TOSHIBA, TOS

Photointerrupter Infrared LED + Phototransistor + Amplifier Circuit

Partnumber Manufacturer Quantity Availability
TLP121-1,TLP1211 TOSHIBA, TOS 1170 In Stock

Description and Introduction

Photointerrupter Infrared LED + Phototransistor + Amplifier Circuit The TLP121-1 is a photocoupler (optoisolator) manufactured by Toshiba. Here are its specifications, descriptions, and features based on Ic-phoenix technical data files:

### **Specifications:**  
- **Isolation Voltage:** 2500 Vrms (min)  
- **Collector-Emitter Voltage (VCEO):** 80 V (max)  
- **Collector Current (IC):** 50 mA (max)  
- **Current Transfer Ratio (CTR):** 50% (min) at IF = 5 mA, VCE = 5 V  
- **Input Forward Current (IF):** 50 mA (max)  
- **Forward Voltage (VF):** 1.15 V (typ) at IF = 5 mA  
- **Turn-On Time (ton):** 3 μs (max)  
- **Turn-Off Time (toff):** 4 μs (max)  
- **Operating Temperature Range:** -55°C to +110°C  

### **Description:**  
The TLP121-1 is a high-speed photocoupler consisting of a GaAs infrared LED and a silicon phototransistor. It provides electrical isolation between input and output circuits, making it suitable for noise suppression and signal transmission in various electronic applications.

### **Features:**  
- High isolation voltage (2500 Vrms)  
- High-speed response (ton/toff: 3 μs/4 μs)  
- Compact 4-pin DIP package  
- High current transfer ratio (CTR ≥ 50%)  
- Wide operating temperature range (-55°C to +110°C)  
- Compatible with lead-free soldering processes  

This information is strictly factual and derived from the manufacturer's datasheet.

Application Scenarios & Design Considerations

Photointerrupter Infrared LED + Phototransistor + Amplifier Circuit

Alternative Part Number

  • PC817 --: Industry-standard general-purpose optocoupler with similar CTR and isolation ratings, widely available and pin-compatible in most circuits.
  • EL817 --: Direct functional equivalent optocoupler with comparable current transfer ratio and isolation voltage, commonly used as a drop-in replacement.
  • LTV-817 --: Equivalent single-channel phototransistor optocoupler offering similar CTR ranges and isolation performance at competitive cost.

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