TCS-DL datasheet(2/7 Pages) BOURNS

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Temperature (°C)

-55

-35

-15

105

125

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

Voltage (V)

-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

1.0

1.2

-10

-20

-30

-40

Temperature (°C)

-55

-35

-15

105

125

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

Speciﬁcations are subject to change without notice.

The device characteristics and parameters in this data sheet can and do vary in differ-

ent applications and actual device performance may vary over time.

Users should verify actual device performance in their speciﬁc applications.

TCS-DL Series - TCS™ Dual Transient Current Suppressors

Performance Graphs

Normalized V-I Curve Under Surge Conditions

Resistance Change vs. Temperature

Graph 1 below shows a normalized Typical V-I curve for Bourns®

TCS™ DL Series High-Speed Protector products under surge

conditions. Graphs 2 and 3 show the change in resistance and

trip current versus temperature, respectively.

Trip Current Change vs. Temperature

SURGE PROTECTION

The Bourns® TCS™ High-Speed Protector is designed to be

used in conjunction with a suitable overvoltage limiting device,

such as a TVS diode or a TISP® thyristor as shown below, to

provide comprehensive current and voltage limiting protection

against surges.

Coordination of Bourns® TCS™ High-Speed Protector with Overvoltage

Limiting Device

This two-stage protection limits the maximum voltage at the

interface to the clamping voltage of the overvoltage device,

while also limiting the current into the protected device to the

deﬁned limit of the Bourns® TCS™ High-Speed Protector.

Designers should choose a Bourns® TCS™ High-Speed

Protector with a current limit that the protected device can

handle for the duration of the surge event.

The Bourns® TCS™ High-Speed Protector acts like a low value

resistor during normal operation. As the Bourns® TCS™ High-

Speed Protector has no electrical connection to anything other

than the signal line it protects, the capacitance to ground is

purely dictated by the capacitance of the device to surrounding

components and PCB traces, which with careful layout can be

kept to an absolute minimum.

The Bourns® TCS™ High-Speed Protector can block voltages

up to 40 V. This enables very low voltage electronics to be

protected by a lower capacitance, higher voltage TVS device,

thus achieving very low capacitive loading on high-speed signal

lines. For example, on a 3.3 V driver, a 12 V rated TVS may

be used, having much lower and more linear capacitance than

a lower voltage type. Even though a high voltage TVS is used,

the maximum stress seen by the protected device is much

lower than would be seen by using a low voltage TVS by itself,

as the current is limited to within the maximum limits of the

Bourns® TCS™ High-Speed Protector.

The Bourns® TCS™ High-Speed Protector is primarily designed

to offer superior and cost-effective protection of sensitive

electronics against high energy surges that are transient in

nature. Unlike the more complex TBU® High-Speed Protector

device, the TCS™ Protector does not exhibit a strong foldback

Basic Device Operation

PROTECTED

DEVICE

VOLTAGE

LIMITING

DEVICE

TRANSIENT

SURGE

Bourns® TCS™ HSP

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