Features High-speed performance RoHS compliant* and halogen free** Superior overcurrent protection Applications Bidirectional VDSL and Ethernet ports Low resistance Protection modules and dongles Excellent channel to channel resistance Process control equipment matching Test and measurement equipment Small SMT package TCS-DL Series - TCS Dual Transient Current Suppressors General Information The Bourns TCS DL Series High-Speed Protector products contain dual, well-matched, low resistance, bidirectional, very high-speed Transient Current Suppressors. By limiting the maximum current to a safe level, a Bourns TCS DL device offers superior protection Line 1 Line 1 for very high data rate differential lines against faults caused by short circuits, induction In/Out Out/In and lightning surges. Bourns TCS High-Speed Protectors are typically used in conjunction with low capacitance Line 2 Line 2 TVS devices to form an extremely low let-through energy barrier to excessive voltages In/Out Out/In and currents during surge events which may cause damage to unprotected high-speed, low voltage driver and receiver components. TCS Device The Bourns TCS High-Speed Protector is provided in a space-saving, surface mount Absolute Maximum Ratings ( T = 25 C Unless Otherwise Noted) A Symbol Parameter Value Unit V Peak impulse voltage withstand with duration less than 1 ms 40 V imp T Operating temperature range -55 to +125 C op T Storage temperature range -65 to +150 C stg T Maximum junction temperature +125 C JMAX Electrical Characteristics ( T = 25 C Unless Otherwise Noted) A Symbol Parameter Part Number Min. Typ. Max. Unit TCS-DL004-250-WH 250 375 500 Current required for the device to go from operating state to I TCS-DL004-500-WH 500 750 1000 mA trigger protected state TCS-DL004-750-WH 750 1100 1500 TCS-DL004-250-WH 1.6 2.3 3.0 R Series resistance of the TCS device TCS-DL004-500-WH 1.0 1.4 1.8 ON TCS-DL004-750-WH 0.7 1.0 1.3 TCS-DL004-250-WH 0.05 Channel to channel resistance match TCS-DL004-500-WH 0.03 RON TCS-DL004-750-WH 0.02 t Time for the device to go from normal operating state to current limiting state 50 ns limit Junction to air thermal resistance, FR4 PCB. R 130 C/W JA 0.035 sq. in. of copper in addition to solder pads Tel: +886-2 2562-4117 Email: asiacus bourns.com EMEA: Tel: +36 88 520 390 Email: eurocus bourns.com The Americas: Tel: +1-951 781-5500 Email: americus bourns.com www.bourns.com * RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011. **Bourns considers a product to be halogen free if (a) the Bromine (Br) content is 900 ppm or less (b) the Chlorine (Cl) content is 900 ppm or less and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less. Specications are subject to change without notice. Users should verify actual device performance in their specic applications. The products described herein and this document are subject to specic legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf *RoHS COMPLIANT & **HALOGEN FREE TCS-DL Series - TCS Dual Transient Current Suppressors Performance Graphs Basic Device Operation Graph 1 below shows a normalized Typical V-I curve for Bourns SURGE PROTECTION TCS DL Series High-Speed Protector products under surge The Bourns TCS High-Speed Protector is designed to be conditions. Graphs 2 and 3 show the change in resistance and used in conjunction with a suitable overvoltage limiting device, trip current versus temperature, respectively. such as a TVS diode or a TISP thyristor as shown below, to provide comprehensive current and voltage limiting protection Normalized V-I Curve Under Surge Conditions against surges. 1.2 Bourns TCS HSP 1.0 PROTECTED 0.8 DEVICE TRANSIENT SURGE 0.6 0.4 0.2 VOLTAGE LIMITING 0 DEVICE -0.2 -0.4 -0.6 Coordination of Bourns TCS High-Speed Protector with Overvoltage Limiting Device -0.8 -1.0 This two-stage protection limits the maximum voltage at the -1.2 -40 -30 -20 -10 0 10 20 30 40 interface to the clamping voltage of the overvoltage device, while also limiting the current into the protected device to the Voltage (V) TCS High-Speed Protector. Designers should choose a Bourns TCS High-Speed Resistance Change vs. Temperature Protector with a current limit that the protected device can 1.5 handle for the duration of the surge event. 1.4 The Bourns TCS High-Speed Protector acts like a low value 1.3 resistor during normal operation. As the Bourns TCS High- 1.2 Speed Protector has no electrical connection to anything other than the signal line it protects, the capacitance to ground is 1.1 purely dictated by the capacitance of the device to surrounding 1.0 components and PCB traces, which with careful layout can be 0.9 kept to an absolute minimum. 0.8 The Bourns TCS High-Speed Protector can block voltages 0.7 up to 40 V. This enables very low voltage electronics to be -55 -35 -15 5 25 45 65 85 105 125 protected by a lower capacitance, higher voltage TVS device, Temperature (C) 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 Trip Current Change vs. Temperature a lower voltage type. Even though a high voltage TVS is used, the maximum stress seen by the protected device is much 2.00 lower than would be seen by using a low voltage TVS by itself, 1.75 as the current is limited to within the maximum limits of the 1.50 Bourns TCS High-Speed Protector. 1.25 The Bourns TCS High-Speed Protector is primarily designed 1.00 to offer superior and cost-effective protection of sensitive 0.75 electronics against high energy surges that are transient in nature. Unlike the more complex TBU High-Speed Protector 0.50 device, the TCS Protector does not exhibit a strong foldback 0.25 0 Specications are subject to change without notice. Users should verify actual device -55 -35 -15 5 25 45 65 85 105 125 performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of Temperature (C) this document and at www.bourns.com/docs/legal/disclaimer.pdf Normalized Trip Current Normalized Current Normalized Resistance