NUP4114UPXV6

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APPLICATIONS INFORMATION

The new NUP4114UPXV6 is a low capacitance TVS

diode array designed to protect sensitive electronics such as

communications systems, computers, and computer

peripherals against damage due to ESD events or transient

overvoltage conditions. Because of its low capacitance, it

can be used in high speed I/O data lines. The integrated

design of the NUP4114UPXV6 offers surge rated, low

capacitance steering diodes and a TVS diode integrated in

a single package (SOT−563). If a transient condition occurs,

the steering diodes will drive the transient to the positive rail

of the power supply or to ground. The TVS device protects

the power line against overvoltage conditions to avoid

damage to the power supply and any downstream

components.

NUP4114UPXV6 Configuration Options

The NUP4114UPXV6 is able to protect up to four data

lines against transient overvoltage conditions by driving

them to a fixed reference point for clamping purposes. The

steering diodes will be forward biased whenever the voltage

bypass the sensitive circuit.

Data lines are connected at pins 1, 3, 4 and 6. The negative

reference is connected at pin 2. This pin must be connected

directly to ground by using a ground plane to minimize the

PCB’s ground inductance. It is very important to reduce the

PCB trace lengths as much as possible to minimize parasitic

inductances.

Option 1

Protection of four data lines and the power supply using

6

5

4

1

2

3

I/O 1

I/O 2

I/O 3

I/O 4

For this configuration, connect pin 5 directly to the

the supply voltage. The internal TVS diode prevents

overvoltage on the supply rail. Biasing of the steering diodes

reduces their capacitance.

Option 2

Protection of four data lines with bias and power supply

isolation resistor.

10 k

6

5

4

1

2

3

I/O 1

I/O 2

I/O 3

I/O 4

The NUP4114UPXV6 can be isolated from the power

supply by connecting a series resistor between pin 5 and

This will maintain a bias on the internal TVS and steering

diodes, reducing their capacitance.

Option 3

Protection of four data lines using the internal TVS diode

as reference.

6

5

4

1

2

3

I/O 1

I/O 2

I/O 3

I/O 4

NC

In applications lacking a positive supply reference or

those cases in which a fully isolated power supply is

required, the internal TVS can be used as the reference. For

these applications, pin 5 is not connected. In this

configuration, the steering diodes will conduct whenever the

voltage on the protected line exceeds the working voltage of

ESD Protection of Power Supply Lines

When using diodes for data line protection, referencing to

a supply rail provides advantages. Biasing the diodes

reduces their capacitance and minimizes signal distortion.

Implementing this topology with discrete devices does have

disadvantages. This configuration is shown below: