Toshiba Announces New Analog Output IC Photocoupler for Automotive Applications

9 Jul

Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has announced the launch of a new analog output IC photocoupler that enables high-speed communications in automotive applications – especially electric vehicles (EV) and hybrid electric vehicles (HEV).

The new TLX9309 consists of a high-output GaAlAs light emitting diode (LED) that is optically coupled to a high-speed detector. The detector consists of a photodiode and a transistor integrated onto a single chip. A Faraday shield has been integrated onto the photodetector chip to provide enhanced levels of common-mode transient immunity – typically up to 15kV/μs, an important parameter in electrically noisy automotive environments.

By separating the photodiode and amplification transistor, the collector capacitance is reduced, reducing propagation delays and making the open-collector TLX9309 faster than transistor output devices. In fact, propagation delay times are guaranteed to be between 0.1μs and 1.0μs, with the difference between high to low and low to high transition (|tpLH-tpHL|) being no more than 0.7μs, making the device suitable for high-speed communications such as inverter control or as an interface to intelligent power modules (IPM).

Electrically, the device offers 3750Vrms of isolation with 5.0mm of creepage and clearance for safety isolation. It operates from a supply in the range -0.5 to 30V DC and can drive up to 25mA at output voltages up to 20V. The current transfer ratio is in the range 15-300%.

The TLX9309 is packaged in a 3.7mm x 7.0mm x 2.2mm RoHS compliant 5-pin SO6 package and operates over the temperature range -40°C to +125°C. The device is AEC-Q101 qualified for use in automotive applications.

The TLX9309 is now in mass production.


Automotive equipment

  • I/O signal communications in inverter control circuits
  • Signal communications within equipment


  • Analog output (Open collector)
  • Data communication rate: 1 Mbps (typ.) @NRZ
  • Compared with a transistor output, propagation delay time is faster:
    tPHL=0.8 μs (max), tPLH=1.0 μs (max)
  • AEC-Q101 qualified

Main Specifications


Part number TLX9309



Forward current IF (mA) 15
Output current IO (mA) 25
Supply voltage VCC (V) -0.5 to 30
Output voltage VO (V) -0.5 to 20


Low level output voltage VOL max (V) 0.4
Current transfer ratio IO/IF min/max (%) 15 / 300
High level supply current ICCH max (μA) 1


Data communications rate typ. (Mbps) 1

Propagation delay time (H to L) tpHL max (μs)


Propagation delay time (L to H) tpLH max (μs)

Propagation delay difference |tpLH-tpHL| max (ns) 0.7
Isolation characteristics Isolation voltage BVS min (Vrms) 3750
Clearance distances min (mm) 5.0
Creepage distances min (mm) 5.0
Package Name 5pin SO6
Size typ. (mm) 3.7×7.0×2.2

Follow the link below for more on the new product and Toshiba’s photocoupler line-up for automotive applications.

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