Datasheet

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August 2006 Rev 10 1/9

USB6B1

Data line protection

Applications

Where transient overvoltage protection in

sensitive equipment is required, such as:

■ Universal Serial Bus ports

■ RS-423 interfaces

■ RS-485 interfaces

■ ISDN equipment

■ T1/E1 line cards

■ HDSL / ASDL interfaces

Features

■ Full diode bridge with integrated clamping

protection

■ Breakdown voltage: V

= 6 V min.

■ Peak pulse power dissipation: P

= 500 W

(8/20 µs)

■ Very low capacitance, compatible with high

debit data or signal rates.

Description

In order to prevent fast transients from leading to

severe damages in a high speed data system, a

specific protection has been developed by

STMicroelectronics.

The USB6B1 protects the two input lines against

overvoltage. Besides, this device also keeps the

power rails in a safe limit thanks to the integrated

Transil diode.

Benefits

■ Provides protection for each line and between

the supply voltage and GND: 25 A, 8/20 µs.

■ High ESD protection level: up to level 3 per MIL

STD 883C-Method 3015-6

■ Separated inputs and outputs (so-called 4-point

structure) to improve ESD susceptibility.

■ Comprehensive package pin-out for immediate

implementation.

Order Codes

Functional diagram

Complies with the following standards:

Part Numbers Marking

USB6B1 USB62

USB6B1RL USB62

MIL STD 883C - Method 3015-6

class 3 C = 100 pF R = 1500 Ω

3 positive strikes and 3 negative strikes (F = 1 Hz)

IEC 61000-4-2 level 4

15 kV (air discharge)

8 kV (contact discharge)

SO-8

I/O1I/O1

I/O2I/O2

GNDGND

www.st.com

Summary of content (9 pages)

PAGE 1
USB6B1 Data line protection Applications Where transient overvoltage protection in sensitive equipment is required, such as: ■ Universal Serial Bus ports ■ RS-423 interfaces ■ RS-485 interfaces ■ ISDN equipment ■ T1/E1 line cards ■ HDSL / ASDL interfaces SO-8 Order Codes Features ■ Full diode bridge with integrated clamping protection ■ Breakdown voltage: VBR = 6 V min.
PAGE 2
Characteristics 1 USB6B1 Characteristics Table 1. Absolute maximum ratings Symbol Parameter Value Unit VPP Peak pulse voltage IEC61000-4-2 contact discharge IEC61000-4-2 air discharge MIL STD883C-Method 30 15-6 8 15 4 kV PPP Peak pulse power 8/20 µs 500 W 8/20 µs 25 IPP Peak pulse current 2/10 µs 40 Tstg Top Storage temperature range Operating temperature range TL Table 2.
PAGE 3
USB6B1 Characteristics Figure 1. Peak power dissipation versus initial junction temperature Figure 2. Ppp[Tj initial]/Ppp[Tj initial=25°C] Relative variation of leakage current versus junction temperature (typical values) IR[Tj] / IR[Tj=25°C] 10.0 1.1 1.0 0.9 0.8 0.7 0.6 1.0 0.5 0.4 0.3 0.2 0.1 Tj initial(°C) Tj(°C) 0.1 0.0 -40 -20 Figure 3. 1.
PAGE 4
Technical information USB6B1 2 Technical information 2.1 Surge protection The USB6B1 is optimized to perform surge protection based on the rail to rail topology. The clamping voltage VCL can be estimated as follow: VCL+ = VCC + VF for positive surges VCL - = - VF for negative surges with: VF =Vt + rd.Ip VF = forward drop voltage, Vt = forward drop threshold voltage Note: The estimations do not take into account phenomena due to parasitic inductances. Figure 4. Surge behavior Figure 5.
PAGE 5
USB6B1 2.3 Technical information Universal Serial Bus The data transmission standard, Universal Serial Bus (USB) is being driven by market leaders in the world of Computer and Telecommunications, including Compaq, DEC, IBM, Intel, Microsoft, NEC and Nortel, and has become a leading transmission protocol. This standard mainly provides simplified interconnectivity. Specialized ports on the back of the present PC will largely be replaced by USB ports.
PAGE 6
Telecom and datacom applications 3 USB6B1 Telecom and datacom applications Figure 7. ISDN U interface protection 3* SMP100 USB6Bx +Vcc LT DC Power Source Figure 8. T1 / E1 Line Card Protection. RTIP USB6B1 SMP75-8 or SMP100-8 +Vcc RRING TTIP +Vcc TRING SMP75-8 or SMP100-8 USB6B1 Figure 9.
PAGE 7
USB6B1 4 Ordering information scheme Ordering information scheme USB 6 B1 RL USB Protection Breakdown voltage 6 = 6V min. Package B1 = SO-8 Packaging RL = Tape & reel Blank = Tube 5 Package information Epoxy meets UL94, V0 Table 3. SO-8 dimensions Dimensions Ref. Millimeters Min. Typ. A C (Seating Plane) ccc C A2 0.25mm (Gage Plane) C L A1 e b A h x 45° k Inches Max. Min. Typ. 1.75 A1 0.1 0.25 A2 1.25 b 0.28 C 0.17 D 4.80 4.90 E 5.80 E1 3.80 Max. 0.069 0.
PAGE 8
Ordering information USB6B1 Figure 10. SO-8 footprint (dimensions in mm) 6.8 0.6 4.2 1.27 In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark.
PAGE 9
USB6B1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.