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Optocouplers pack multiple current transfer ratios

Posted: 20 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:optocoupler? transistor? photodiode?

DIP optocouplers

Everlight Electronics Co. Ltd has released three new families of 8-pin DIP optocouplers featuring high isolation voltage (5000Vrms, 1 minute), low-profile surface mount availability (S1 option at 3.9mm max), and 8mm external creepage distance.

The 1MBd high-speed transistor series offers multiple current transfer ratios (CTR) ranges and a wide operating temperature range of -55C to +100C. The 10MBd logic gate high-speed optocoupler provides guaranteed performance over an operating temperature range -40 C to +85 C and a narrow pulse width distortion of 35ns. The high-gain split Darlington series consists of devices with high CTRs of 2000 percent typical at low input current of 1.6mA. These key device features offer exceptional flexibility when designing line receivers, providing analog signal or digital logic ground isolation, or suppressing common mode transient noises.

The 1MBd high-speed transistor optocoupler family consists of the 6N135, 6N136 and EL4502 part numbers which have separate connections for a photodiode bias and an output-transistor collector to increase the speed by several orders of magnitude over conventional phototransistor optocouplers. They offer key features such as defined CTR ranges and improved transient noise immunity, and replace pulse transformers for high voltage level shifting. The 6N137 is a 10MBd logic gate high-speed optocoupler with a high-speed integrated photo detector. It is beneficial to applications requiring high data rate transmission while preserving the integrity of the signal by preventing common mode transient noises. The 6N138 and 6N139 devices from the high-gain split Darlington series can be directly driven by CMOS circuits and offers high CTRs at low input currents. They are suited for applications in need of low power consumption, ground isolation and high transient immunity.

These 8-pin DIP devices, like all Everlight DIP optocouplers, are available in two surface leadform options (S and S1). In addition to saving space in height-constrained applications, the lower profile S1 option retains the 5,000Vrms isolation voltage safety benefits of a DIP package. All products are lead Pb-free and RoHS-compliant.

- Henri Arnold
EE Times Europe

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