DATA SHEET SMP1302-085LF: Surface Mount PIN Diode for High Power Switch Applications Applications • Low loss, high power switches • Low distortion attenuators Features • Low-thermal resistance: 22 °C/W • Suitable for 140 W Continuous Wave T/R switches • Low capacitance: 0.3 pF Figure 1. SMP1302-085LF Block Diagram • Low distortion performance • QFN (3-pin, 2 x 2 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Description The SMP1302-085LF is a surface mountable, low capacitance silicon PIN diode designed as a shunt connected PIN diode for high power, high volume switch and attenuator applications from 10 MHz to beyond 6 GHz. Maximum resistance at 100 mA is 1.5 Ω and maximum capacitance at 30 V is 0.35 pF. The combination of low junction capacitance, low parasitic inductance, low thermal resistance, and nominal 50 μm I-region width, makes the SMP1302-085LF useful in large signal switches and attenuator applications. The device has a 2.8 W dissipation power rating, making it capable of handling more than 140 W Continuous Wave (CW) and 500 W peak (1 μs pulse, 1 percent duty cycle) in a shuntconnected transmit/receive (T/R) switch. Design information for high power switches may be found in the Skyworks Application Note, Design With PIN Diodes (document number 200312). A block diagram of the SMP1302-085LF is shown in Figure 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200966N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 17, 2013 1 DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Table 1. SMP1302-085LF Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units Reverse voltage VR 200 V Forward current @ 25 °C IF 200 mA CW power dissipation @ 85 °C PD 2.8 W 30 W Peak pulse power dissipation @ 85 °C (10% duty cycle) Storage temperature TSTG –65 +200 °C Operating temperature TA –40 +150 °C Electrostatic Discharge: Charged Device Model (CDM), Class 4 Human Body Model (HBM), Class 1C Machine Model (MM), Class C ESD 1100 1000 400 V V V Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Table 2. SMP1302-085LF Electrical Specifications (Note 1) (TA = +25 °C Unless Otherwise Noted) Parameter Symbol Test Condition Reverse current IR VR = 200 V Capacitance CT f = 1 MHz, VR = 30 V Resistance RS Min Typical Max Units 10 μA 0.35 pF 3 1.5 Ω Ω f = 100 MHz IF = 10 mA IF = 100 mA 1.0 Forward voltage VF IF = 10 mA 0.8 V Carrier lifetime TL IF = 10 mA 700 ns I region width W 50 μm CW thermal resistance θJC Junction-to-case 22 °C/W Peak thermal resistance θP Single 1 μs pulse width, junction-to-case (10% duty cycle) 2.2 °C/W Note 1: Performance is guaranteed only under the conditions listed in this Table. Electrical and Mechanical Specifications The absolute maximum ratings of the SMP1302-085LF are provided in Table 1. Electrical specifications are provided in Table 2. Typical performance characteristics of the SMP1302-085LF are illustrated in Figures 2 and 3. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 July 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200966N DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Typical Performance Characteristics (TA = 25 °C, Unless Otherwise Noted) Figure 2. Series Resistance vs Current @ 100 MHz High Power Switch Design Application The SMP1302-085LF PIN diode is designed for shunt applications such as reflective switches or shunt-diode attenuator circuits. Compared to other surface mount packages, the design of the QFN package produces lower thermal resistance and also reduces the effects of the parasitic inductance of the anode bond wires. A cross-sectional view of the SMP1302-085LF PIN diode is shown in Figure 4. The cathode of the die is soldered directly to the top of the exposed paddle. This paddle is composed of copper, so its thermal resistance is very low. Figure 3. Forward Voltage vs Forward Current generated under normal operation, and the surface to which the package is mounted. Minimal thermal resistance between the I layer and the external environment minimizes junction temperature. The electrically equivalent circuit of the SMP1302-085LF PIN diode is shown in Figure 5. The inductances of pins 1 and 2, as well as the inductances of the bond wires are in series with the input and output transmission lines of the external circuit rather than the portion of the circuit that contains the shunt PIN diode. The copper ground paddle minimizes the total thermal resistance between the I layer, which is the location where most heat is Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200966N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 17, 2013 3 DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Figure 4. Cross-Sectional View of the SMP1302-085LF Figure 5. SMP1302-085LF Electrically Equivalent Circuit The effects of these parasitic series inductances are negligible, since they add a very small insertion loss to the shunt PIN but have no effect on the isolation that the diode produces when it is forward biased. low insertion loss (0.42 dB) and high receiver isolation (37 dB). The input 1 dB compression point is higher than +50 dBm. In the receive state, the switch produced 0.45 dB insertion loss and 37.8 dB transmitter isolation. A cross section of the suggested printed circuit board design is shown in Figure 6. The via shown in this view is critical, both for electrical performance and for thermal performance. It is recommended that several vias should be placed under the entire footprint of the exposed paddle (pin 2) to minimize both electrical inductance to the system ground and thermal resistance to the system heat sink. The circuit is based on a quarter wave design using two shuntconnected SMP1302-085LF diodes. In the transmit state, Bias 1 is set at 0 mA and Bias 2 is set at 50 mA. Under these conditions, D1 is held out of conduction so its impedance remains high and a very small insertion loss is introduced to the path between the transmitter port and the antenna port. A Transmit/Receive Switch Design A T/R switch incorporating a pair of SMP1302-085LF PIN diodes and covering 2.0155 GHz to 2.0195 GHz has been designed and tested. This circuit is shown in Figure 7. The switch operated safely at a transmitter input power of +41 dBm CW (12.6 W) with D2 is forced into conduction, which lowers its series resistance towards its minimum value of <1 Ω. In this state, energy that propagates from either the transmitter port or the antenna port is reflected, which isolates the receiver port from the remainder of the circuit. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 July 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200966N DATA SHEET • SMP1302-085LF DIODE Figure 6. Cross-Sectional View of Suggested Printed Circuit Board Figure 7. T/R Switch Design: 2.0155 GHz to 2.0195 GHz Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200966N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 17, 2013 5 DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Table 3. Measured T/R Switch Performance Parameter Symbol Conditions Frequency Value 2.010 to 2.025 GHz Insertion loss (transmit port to antenna) Bias 1 = 0 mA, Bias 2 = 50 mA 0.42 dB Insertion loss (antenna to receive port) Bias 1 = 50 mA, Bias 2 = 0 mA 0.45 dB Isolation (receive port to transmit port) Bias 1 = 0 mA, Bias 2 = 50 mA 37 dB Isolation (transmit port to receive port) Bias 1 = 50 mA, Bias 2 = 0 mA 37.8 dB 0.1 dB Input Compression Point IP0.1dB Bias 1 = 0 mA, Bias 2 = 50 mA, pulse width = 8 μs, duty cycle = 0.5% +46 dBm 1 dB Input Compression Point IP1dB Bias 1 = 0 mA, Bias 2 = 50 mA, pulse width = 8 μs, duty cycle = 0.5% >+50 dBm 3rd Order Input Intercept Point IIP3 f1 = 2.0155 GHz, f2= 2.0195 GHz >+80 dBm Maximum transmit CW input power Bias 1 = 0 mA, Bias 2 = 50 mA +41 dBm Maximum pulsed transmit input power Bias 1 = 0 mA, Bias 2 = 50 mA, pulse width = 8 μs, duty cycle = 0.5% >+49.5 dBm Transmit state to receive state, Bias 1 = 0/50 mA, Bias 2 = 50/0 mA <0.85 μs Transmit input return loss Bias 1 = 0 mA, Bias 2 = 50 mA 27.8 dB Receive input return loss Bias 1 = 50 mA, Bias 2 = 0 mA 28.8 dB Switching speed TSW The quarter wave line connected between D2 and the antenna port transforms the very low impedance of the diode to a very high impedance looking from the antenna port towards the receive port. This produces minimal insertion loss in the transmitter-toantenna path. In the receive state, Bias 1 is set at 50 mA and Bias 2 is set at 0 mA. The operation of the T/R switch in this state is the converse of the operation in the transmit state: the transmitter port is isolated from the antenna port and the antenna and receive ports are connected to each other using a low-insertion-loss path. The measured performance of this circuit is summarized in Table 3. Package Dimensions Package and Handling Information Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SMP1302-085LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to the Skyworks Application Note, Solder Reflow Information, document number 200164. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. The PCB layout footprint for the SMP1302-085LF is shown in Figure 8. Typical case markings are shown in Figure 9. Package dimensions for the 3-pin QFN are provided in Figure 10, and Figure 11 provides the tape and reel dimensions. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 July 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200966N DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Figure 8. SMP1302-085LF PCB Layout Footprint Figure 9. Typical Case Markings (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200966N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 17, 2013 7 DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Figure 10. SMP1302-085LF QFN Package Dimension Drawing Figure 11. SMP1302-085LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 July 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200966N DATA SHEET • SMP1302-085LF SURFACE MOUNT PIN DIODE Ordering Information Model Name SMP1302-085LF Surface Mount PIN Diode Manufacturing Part Number SMP1302-085LF Copyright © 2009, 2010, 2011, 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200966N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 17, 2013 9