SDC36. TVS Diode Array for Proximity Switch Input Protection. PROTECTION PRODUCTS Description. Features. Mechanical Characteristics.

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1 Description The SDC36 is a highsurge transient voltage suppressor (TS) optimized for protection of sensitive digital sensors used in proximity switches and industrial control applications. The SDC36 protects the components from overvoltages caused by electrostatic discharge (ESD), electrical fast transients (EFT), and tertiary lightning. The unique design of the SDC36 incorporates two TS diodes in a compact SOT23 package for applications where board space is at a premium. The single package provides protection for the I/O line and power supply rail with high surge capabilities (2 Amps at t p =1.2/us) and an exceptionally low clamping voltage of <45. The SDC36 replaces up to two large discrete diodes providing the designer an easy to implement integrated solution. The features of the SDC36 are ideal for protection of two, three, and four wire DC highside proximity switches. SDC36 TS Diode Array for Proximity Switch Input Protection Features 3 watts peak pulse power (t p = 8/2µs) Transient protection for data and power lines to IEC 6142 (ESD) ±15k (air), ±8k (contact) IEC 6144 (EFT) 4A (5/ns) IEC 6145 (Lightning) 2A (1.2/µs) Replaces two discrete devices Low clamping voltage Low leakage current High surge capability Solidstate silicon avalanche technology Mechanical Characteristics JEDEC SOT23 package Molding compound flammability rating: UL 94 Marking : DC36 Packaging : Tape and Reel per EIA 481 Applications Two, Three, and Four Wire DC HighSide Proximity Switches Digital Sensor Input Protection Industrial Controls DC Supply Protection Circuit Diagram Schematic & PIN Configuration SOT23 (Top iew) Revision 12/15/4 1

2 Absolute Maximum Rating Rating Symbol alue Units Peak Pulse Power (t = 8/2µs) P p k Peak Pulse Power (t = 1.2/µs) P p k p p 3 Watts 2 Watts Peak Pulse Current ( t p = 1.2/µs) I PP 4 A NonRepetitive Peak Forward Current ( t p = 1µs ) IF SMAX 4 A Lead Soldering Temperature T L 26 (1 sec. ) C Operating Temperature T J 55 to +125 C Storage Temperature T STG 55 to +1 C Electrical Characteristics SDC36 Parameter Symbol Conditions Minimum Typical Maximum Units StandOff oltage WM Breakdown oltage R in 3 to 1 or Pin 2 to 1 R P 33 B I t = 1mA 36 Leakage Current I R RWM = 33, T=25 C 5 µ A Leakage Current I (HOT) R RWM = 33, T=85 C 25 µ A Forward oltage F I F = 1m A 1. 3 Clamping oltage C I P P = 2A, tp = 1.2/µs 45 Junction Capacitance C j R =, f = 1MHz 45 pf 24 Semtech Corp. 2

3 Typical Characteristics Peak Pulse Power Ppk (kw) NonRepetitive Peak Pulse Power vs. Pulse Time Pulse Duration t p (µs) % of Rated Power or I PP Power Derating Curve Ambient Temperature T A ( o C) Pulse Waveform Clamping oltage vs. Peak Pulse Current Percent of IPP e t td = IPP/2 Waveform Parameters: tr = 8µs td = 2µs Time (µs) Clamping oltage C () Bidirectional (Pin 1 to 2) Unidirectional (pin 3 to 1 and 3 to 2) Waveform Parameters: tr = 8µs td = 2µs Peak Pulse Current I PP (A) Forward oltage vs. Forward Current 3 Forward oltage F () Waveform Parameters: tr = 8µs td = 2µs Forward Current I F (A) 24 Semtech Corp. 3

4 Applications Information Device Connection for Protection of Two, Three, and Four Wire Proximity Switches 2Wire DC Proximity Switch Application Digital sensors help to bridge the gap between the physical world and the digital world in applications such as computer controlled factory automation. In such environments, transient voltages can easily disrupt or damage sensitive sensor inputs. The SDC36 provides transient voltage protection for the digital sensors to ensure their operation is not disrupted by the physical world. The SDC36 is designed to meet the high surge capability and low clamping voltage needed to protect the ASIC and control logic used in proximity switches. The SDC36 provides protection for the power and I/O lines. Typical configurations for the protection of two, three, and four wire switches are as follows: 3Wire DC Proximity Switch Application 1. TwoWire Switch: Connect pin 1 to the I/O line and pin 2 to the DC supply (since the device is symmetrical, these connections can be reversed). Pin 3 is not connected. 2. ThreeWire Switch: Either pin 1 or pin 2 is connected to the I/O line with the other connected to ground. Pin 3 must be connected to the DC supply. 3. FourWire Switch: Two device are required to protect four wire switches. Pin 3 of each device is connected to the DC supply line. Pins 1 and 2 are connected to the I/O lines and ground as shown. 4Wire DC Proximity Switch Application 24 Semtech Corp. 4

5 Outline Drawing SOT23 D e e A B E1 bxn bbb E C A B SEATING PLANE C GAUGE PLANE.25 H DETAIL A L L1 c DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A A A b c D E E e BSC e BSC L L1.22 (.55) N aaa.4.1 bbb.8.2 A A2 3X aaa C SEATING PLANE SIDE IEW SEE DETAIL A A1 C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS A AND B TO BE DETERMINED AT DATUM PLANE H 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern SOT23 X Z Y Y G C DIMENSIONS DIM INCHES MILLIMETERS C (.87) (2.2) E E G.31.8 X Y Z E1 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPCSM782A. E Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC Publication Semtech Corp. 5

6 Ordering Information Part Number Lead Finish Qty per Reel Reel Size SDC36.TC SDC36.TCT SnPb 3, 7 Inch Pb Free 3, 7 Inch Contact Information Semtech Corporation Protection Products Division 2 Flynn Rd., Camarillo, CA 9312 Phone: (85) FAX (85) Semtech Corp. 6