DATA SHEET SMP1325-085LF: Surface-Mount PIN Diode for High-Power Switch Applications Applications Anode (Pin 1) Low-loss, high-power switches Anode (Pin 3) Low-distortion attenuators Features Cathode (Pin 2, Exposed Paddle) Low-thermal resistance: 13 °C/W Suitable for 100 W continuous wave T/R switches Low capacitance: 0.56 pF typical @ 20 V Figure 1. SMP1325-085LF Block Diagram Low distortion performance QFN (3-pin, 2 x 2 mm) package (MSL1, 260 C per JEDEC J-STD-020) Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04–0074. Description The SMP1325-085LF 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 0.5 Ω and maximum capacitance at 20 V is 0.65 pF. The combination of low junction capacitance, low parasitic inductance, low thermal resistance, and nominal 100 μm I-region width, makes the SMP1325-085LF useful in large signal switches and attenuator applications. The device has a 4.5 W dissipation power rating, making it capable of handling more than 100 W continuous wave (CW) and 1000 W peak (1 μs pulse, 1 percent duty cycle, TC = 85 °C) in a shunt-connected transmit/receive (T/R) switch. Design information for high-power switches can be found in the Skyworks Application Note, Design With PIN Diodes (document number 200312). A block diagram of the SMP1325-085LF is shown in Figure 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201648F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 13, 2015 1 DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE Electrical and Mechanical Specifications A plot of series resistance versus formard current is shown in Figure 2. The absolute maximum ratings of the SMP1325-085LF are provided in Table 1. Electrical specifications are provided in Table 2. Table 1. SMP1325-085LF Absolute Maximum Ratings Parameter Symbol Maximum Units VR 200 V Forward current @ 25 °C IF 200 mA CW power dissipation @ 85 °C PD 4.5 W Reverse voltage Minimum Peak pulse power dissipation @ 85 °C (10% duty cycle) 450 W Storage temperature TSTG –65 +200 C Operating temperature TA –40 +150 C 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. SMP1325-085LF 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 = 20 V Resistance RS f = 100 MHz Min Typical 0.56 IF = 1 mA IF = 10 mA IF = 100 mA 8 1.3 0.35 Max Units 10 μA 0.65 pF 0.50 Ω Ω Ω Forward voltage VF IF = 1 mA 0.65 V Carrier lifetime TL IF = 10 mA 5 μs I region width W CW thermal resistance (Note 2) θJC μm 100 13 Note 1: Performance is guaranteed only under the conditions listed in this table. Note 2: Measurement based on a thermal resistance of 92 C/W for the junction-to-bottom of circuit board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 March 13, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201648F C/W DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE Typical Performance Characteristics (TA = 25 °C, Unless Otherwise Noted) Series Resistance (Ω) 100 10 1 0.1 0.1 1 10 100 Forward Current (mA) Figure 2. Series Resistance vs Current @ 100 MHz High-Power Switch Design Applications The SMP1325-085LF 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 SMP1325-085LF PIN diode is shown in Figure 3. 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. The copper ground paddle minimizes the total thermal resistance between the I layer, which is the location where most heat is 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 SMP1325-085LF PIN diode is shown in Figure 4. 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 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. A cross section of the suggested printed circuit board design is shown in Figure 5. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201648F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 13, 2015 3 DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE Bond Wire (2 Places) Encapsulated Epoxy SMP1325-085LF Die Anode (Pin 1) Cathode (Pin 2) Anode (Pin 3) Not to scale S1628g Figure 3. Cross-Sectional View of the SMP1325-085LF LSERIES LSERIES Pin 3 Pin 1 CPKG CPKG SMP1325-085LF Die LPADDLE Pin 2 S1629g Figure 4. SMP1325-085LF Electrically Equivalent Circuit SMP1325-085LF Thermal Via S1630g Figure 5. Cross-Sectional View of Suggested Printed Circuit Board Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 March 13, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201648F DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE Package Dimensions Package and Handling Information The PCB layout footprint for the SMP1325-085LF is shown in Figure 6. Typical part markings are shown in Figure 7. Package dimensions for the 3-pin QFN are provided in Figure 8, and Figure 9 provides the tape and reel dimensions. 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 SMP1325-085LF 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. 2X 0.60 Part Outline 2X 0.55 Exposed Soldering Area Typ. 2X 0.27 Pin 3 2X 0.85 Pin 1 Pin 2 R0.20 2X 0.25 S2923 Figure 6. SMP1325-085LF PCB Layout Footprint RH Skyworks Part # 3 3 1 Orientation Indicator 1 Figure 7. Typical Part Markings (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201648F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 13, 2015 5 DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE 0.5 ± 0.15 2 ± 0.2 Exposed Pad Detail B 2 ± 0.2 1.7 ± 0.15 1 3 2 0.90 ± 0.1 Orientation Indicator Top View Side View Bottom View 1 3 0.4 ± 0.1 2 0.27 ± 0.15 Detail B All dimensions in millimeters S1632 Figure 8. SMP1325-085LF QFN Package Dimension Drawing ∅1.50+ 0.10/–0.00 0.30 ± 0.05 (T) Pin #1 4.00 ± 0.10 2.00 ± 0.05 4.00 (see Note 4) 1.75 ± 0.10 2.30 (Bo) A B 1.00 (Ko) 2.30 (Ao) 8.00 +0.30/–0.10 A 3.50 ± 0.05 B ∅1.00 Min. R0.30 Typ. B Notes: 1. Carrier tape: black conductive polystyrene. 2. Cover tape material: transparent conductive HSA. 3. Cover tape size: 5.40 mm width. 4. Ten sprocket hole pitch cumulative tolerance = ±0.20 mm. 5. ESD surface resistivity is ≤1 x 108 Ohms/square per EIA, JEDEC tape and reel specification. 6. Ao and Bo measurement point to be 0.30 mm from bottom pocket. 7. All measurements are in millimeters. A S1601 Figure 9. SMP1325-085LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 March 13, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201648F DATA SHEET • SMP1325-085LF: SURFACE-MOUNT PIN DIODE Ordering Information Model Name SMP1325-085LF: Surface-Mount PIN Diode Manufacturing Part Number SMP1325-085LF Copyright © 2011- 2013, 2015 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201648F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 13, 2015 7