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PS2501-1

1-ch optocoupler, 5000Vrms isolation, 80-160% CTR, DIP-4

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Manufacturer Part：

PS2501-1

Package：

DIP-4 (7.62×6.4×3.9 mm, 2.54mm pitch, through-hole)

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Description

Product Overview

The PS2501-1 from Renesas Electronics (formerly NEC) is a 1-channel photocoupler (optocoupler) consisting of a gallium arsenide infrared LED optically coupled to a silicon phototransistor. It provides electrical isolation of up to 5000Vrms between input and output, making it ideal for signal isolation in SMPS feedback loops, industrial control, and communication interfaces. Packaged in a DIP-4 through-hole package.

Key Specifications

Channels 1
Isolation Voltage 5000 Vrms (min)
CTR (Current Transfer Ratio) 80-160% @ IF=5mA
LED Forward Voltage 1.2V typical @ IF=20 mA
LED Forward Current 50 mA (max continuous)
Collector-Emitter Voltage 80V (BVCEO)
Collector Current 50 mA (max)
Bandwidth (Cutoff Frequency) 80 kHz (typical)
Operating Temperature -55°C to +100°C
Package DIP-4 (4-pin through-hole)

Features

  • High isolation voltage: 5000 Vrms minimum
  • High CTR: 80-160% at IF=5mA
  • Wide operating temperature: -55°C to +100°C
  • Compact 4-pin DIP package
  • UL recognized and VDE approved
  • Industry-standard pinout compatible with PC817, 4N25

Applications

  • SMPS feedback loop signal isolation with TL431
  • Industrial control system I/O isolation
  • Communication interface signal isolation
  • Programmable logic controller (PLC) input isolation
  • Medical equipment isolation barrier

The PS2501-1 from Renesas Electronics is a single-channel photocoupler providing 5000 Vrms electrical isolation between a GaAs IR LED input and silicon phototransistor output. With 80-160% CTR at 5 mA LED current, it is widely used for SMPS feedback loop isolation (typically paired with TL431), industrial control I/O isolation, and communication interface signal isolation. The DIP-4 package is pin-compatible with industry-standard optocouplers.

The PS2501-1 consists of a gallium arsenide infrared LED on the input side and a silicon NPN phototransistor on the output side, separated by an optically transparent insulating medium. When current flows through the LED, it emits infrared light that passes through the isolation barrier and illuminates the phototransistor base region. The photogenerated current in the base drives the phototransistor, producing a collector current proportional to the LED current. The CTR (Current Transfer Ratio) of 80-160% means the output current can be equal to or greater than the input LED current. The 5000 Vrms isolation rating ensures safe separation between high-voltage and low-voltage circuit domains.

Pin Name Type Function
1 Anode Input LED anode (connect via current-limiting resistor)
2 Cathode Input LED cathode (connect to signal source GND)
3 Emitter Output Phototransistor emitter
4 Collector Output Phototransistor collector (connect via pull-up resistor)
  • SMPS feedback loop isolation: TL431 error amplifier output to PWM controller
  • Industrial control system digital I/O isolation and level shifting
  • Communication interface signal isolation (RS-485, CAN, UART)
  • Programmable logic controller (PLC) input channel isolation
  • Medical equipment patient isolation barrier
Manufacturer Part Number Package Notes
Sharp PC817 DIP-4 Industry-standard equivalent, very popular
Vishay SFH618A-3 DIP-4 100-200% CTR, similar application
ON Semiconductor 4N25 DIP-6 Base pin available, 6-pin package
Renesas PS2501-1-A SOP-4 SMD version of PS2501-1
Broadcom HCPL-817 DIP-4 High CTR version, pin-compatible
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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