Surge protector for TTL 5V digital buses

The product is designed for surge protection of buses and digital ports operating at a TTL voltage level of 5V, such as DATA CLOCK, SPI, I2C, or Weigand. The low insertion capacitance allows for digital transmission at speeds of up to 10Mbit.

SUG-TTL-5V protects digital devices from atmospheric discharges, transient potential differences, and other types of threats originating from transmission lines or as a result of sabotage actions (for example, the use of a stun gun).

 

The protective circuits eliminate current surges with respect to ground potential and prevent transient voltage spikes between individual conductors. The protective circuits utilize an automatic MOSFET fuse, which increases protective effectiveness compared to traditional solutions, additionally eliminating the effects of transient potential differences between devices. The MOSFET fuse has very low hysteresis and a response time of 1µS, quickly disconnecting the input circuit from the output circuit after exceeding the rated current of just 0.5mA above the norm. Once the threat has passed, the connection is restored in the same time of 1µS.

 

Example of the arrangement of limiters in the current loop

Example of the correct arrangement of surge protectors in a current loop installation.

 

Short technical specification

PARAMETER NAME
 VALUE
Number of protected channels 3
Input / output connector Screw
Rated DC voltage (Un)
 5V
Maximum DC voltage (Uc)
 6V
Rated current (In)
 200mA
Maximum rated current 200.5mA
Decoupling element
 MOSFET fuse
C1: Discharge current line-line 8/20µs (In) 0.25kA
C2: Discharge current line-ground 8/20µs (In) 10kA
D1: Maximum lightning current 10/350µs (Iimp)  3.5kA
Protection level 1kV/μs (line-line) Up 12V
Protection level 1kV/μs (line-ground) Up 90V
Series resistance
7Ω/line
Dimensions 57 x 32 x 28 (mm)
Mounting method Free-standing housing
Grounding method
 Wire
Enclosure protection IP20
Operating temperature -40ºC~80ºC

Product safety information Manufacturer information



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