Description The is a highsurge transient voltage suppressor (TS) optimized for protection of sensitive digital sensors used in proximity switches and industrial control applications. The protects the components from overvoltages caused by electrostatic discharge (ESD), electrical fast transients (EFT), and tertiary lightning. The unique design of the incorporates two TS diodes in a compact 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 =1.2/5us) and an exceptionally low clamping voltage of <47. The replaces up to two large discrete diodes providing the designer an easy to implement integrated solution. The is in a 3pin, RoHS/WEEE compliant, SOT23 package. The small size and unique features of the make it ideal for protection of two, three, and four wire DC highside proximity switches. TS Diode Array for Proximity Switch Input Protection Features 35 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 (5/5ns) IEC 6145 (Lightning) 2A (1.2/5μs) Replaces two discrete devices Low clamping voltage Low leakage current High surge capability Solidstate silicon avalanche technology Mechanical Characteristics JEDEC SOT23 package RoHS/WEEE Compliant Molding compound flammability rating: UL 94 Marking : D36C Packaging : Tape and Reel Applications Two, Three, and Four Wire DC HighSide Proximity Switches Digital Sensor Input Protection Industrial Controls 24 33 DC Supply Protection Circuit Diagram Schematic & PIN Configuration SOT23 (Top iew) Revision 4/1/8 1
Absolute Maximum Rating Rating Symbol alue Units Peak Pulse Power (t = 8/2μs) P p k Peak Pulse Power (t = 1.2/5μs) P p k p 5 p 25 3 Watts 2 Watts Peak Pulse Current ( t p = 1.2/5μs) I PP 4 A NonRepetitive Peak Forward Current ( t p = 1μs ) I 4 A FSMAX Operating Temperature T J 55 to +125 C Storage Temperature T STG 55 to +15 C Electrical Characteristics (T=25 o C) SDC36B 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 35 Leakage Current I R RWM = 33, T=25 C 5 μa Leakage Current I (HOT) R RWM = 33, T=85 C 25 μa Forward oltage F I F = 1m A 1. 3 Clamping oltage C I P P = 2A, tp = 1.2/5μs 47 Junction Capacitance C j R =, f = 1MHz 1 pf 28 Semtech Corp. 2
Typical Characteristics Peak Pulse Power Ppk (kw) NonRepetitive Peak Pulse Power vs. Pulse Time 1 1.1.1.1 1 1 1 1 Pulse Duration t p (µs) % of Rated Power or I PP Power Derating Curve 11 1 9 8 7 6 5 4 3 2 1 25 5 75 1 125 15 Ambient Temperature T A ( o C) Pulse Waveform Clamping oltage vs. Peak Pulse Current Percent of IPP 11 1 9 8 7 6 5 4 3 2 1 e t td = IPP/2 Waveform Parameters: tr = 8µs td = 2µs 5 1 15 2 25 3 Time (µs) Clamping oltage () 6. 58. 56. 54. 52. 5. 48. 46. Waveform 44. Parameters: tr = 1.2μs 42. td = 5μs 4. 1 2 3 4 5 Peak Pulse Current (A) Forward oltage vs. Forward Current 3 Forward oltage F () 2.5 2 1.5 1.5 Waveform Parameters: tr = 8µs td = 2µs 1 2 3 4 5 6 7 8 9 1 11 12 Forward Current I F (A) 28 Semtech Corp. 3
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 provides transient voltage protection for the digital sensors to ensure their operation is not disrupted by the physical world. The 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 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. Matte Tin Lead Finish 4Wire DC Proximity Switch Application Matte tin has become the industry standard leadfree replacement for SnPb lead finishes. A matte tin finish is composed of 1% tin solder with large grains. Since the solder volume on the leads is small compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both leadfree and SnPb assembly techniques. In addition, unlike other leadfree compositions, matte tin does not have any added alloys that can cause degradation of the solder joint. 28 Semtech Corp. 4
Outline Drawing SOT23 D e1 3 1 2 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.35.44.89 1.12 A1..4.1.1 A2.35.37.4.88.95 1.2 b c D.12.3.11.114.2.7.12.3.8 2.8 2.9.51.18 3.4 E.82.93.14 2.1 2.37 2.64 E1.47.51.55 1.2 1.3 1.4 e.75 1.9 BSC e1.37.95 BSC L.15.2.24.4.5.6 L1.22 (.55) N 3 3 8 8 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.37.95 E1.75 1.9 G.31.8 X.39 1. Y.55 1.4 Z.141 3.6 NOTES: E1 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 28 Semtech Corp. 5
Marking Code Ordering Information D36C Part Number.TCT Lead Finish Qty per Reel Reel Size Pb Free 3, 7 Inch Contact Information Semtech Corporation Protection Products Division 2 Flynn Rd., Camarillo, CA 9312 Phone: (85)4982111 FAX (85)498384 28 Semtech Corp. 6