DATA SHEET CLA4611-085LF: Surface Mount Limiter Diode Applications Low-loss, high-power limiters Receiver protectors Anode (Pin 1) Anode (Pin 3) Features Low thermal resistance: 15 °C/W Typical threshold level: +25 dBm Cathode (Pin 2, Exposed Paddle) Low capacitance: 0.25 pF Low profile, ultra-miniature 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. Figure 1. CLA4611-085LF Block Diagram Description The CLA4611-085LF is a surface mountable, low capacitance silicon PIN limiter diode designed as a shunt connected PIN diode for high power limiter applications from 10 MHz to over 6 GHz. Maximum resistance at 10 mA is 1.2 Ω and maximum capacitance at 38 V is 0.25 pF (typical). The combination of low junction capacitance, low parasitic inductance, low thermal resistance, and nominal 12 μm I-region width, makes the CLA4611-085LF useful in large signal limiter applications. The threshold level is +25 dBm, nominal. A block diagram of the CLA4611-085LF is shown in Figure 1. The absolute maximum ratings of the CLA4611-085LF are provided in Table 1. Electrical specifications are provided in Table 2. Typical performance characteristics of the CLA4611-085LF are provided in Table 3 and illustrated in Figure 4. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203346B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 8, 2015 1 DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE Table 1. CLA4611-085LF Absolute Maximum Ratings (Note 1) Parameter Symbol Maximum Units VR 180 V Forward current @ 25 °C IF 1.5 A CW power dissipation @ 85 °C PD 2 W Reverse voltage Minimum Peak pulse power dissipation @ 85 °C (10% duty cycle) Storage temperature TSTG Junction temperature TJ Operating temperature TA Electrostatic discharge: ESD –65 –40 Charged Device Model (CDM), Class 4 Human Body Model (HBM), Class 1B Machine Model (MM), Class A 20 W +200 C 175 C +150 C 1000 500 100 V V V Note 1: 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. CLA4611-085LF Electrical Specifications (Note 1) (TA = +25 C Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Reverse current IR VR = 120 V 10 μA Capacitance CT f = 1 MHz, VR = 38 V 0.25 0.35 pF Series resistance RS f = 500 MHz, IF = 10 mA 0.75 1.2 Ω Carrier lifetime TL IF = 10 mA 300 ns I region width W 12 μm CW thermal resistance θJC Junction-to-case 15 C/W Peak thermal resistance θP Single 1 μs pulse width, junction-tocase (10% duty cycle) 2 C/W Note 1: Performance is guaranteed only under the conditions listed in this table. Table 3. Typical Performance @ 25 °C Part Number Insertion Loss @ –10 dBm (dB) Input Power for 1 dB Loss (dBm) Maximum Pulsed Input Power (dBm) Output @ Maximum Pulsed Input (dBm) Maximum CW Input power (W) Recovery Time (ns) CLA4611-085LF 0.3 25 50 32 10 300 Notes: Limiter power results @ 1 GHz for shunt connected, single limiter diode and DC return in 50 Ω line. Maximum pulsed power for 1 μs pulse and 0.1% duty factor with chip @ 25 °C heat sink. Derate linearly to 0 W @ 175 °C. Maximum CW input power @ 25 °C heat sink. Derate linearly to 0 W @ 175 °C. Recovery time to insertion loss from limiting state. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 8, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203346B DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE Functional Description The PIN limiter diode can be described as an incident power controlled, RF variable resistor. When there is no large input signal present, the impedance of the limiter diode is at its maximum, which produces minimum insertion loss, typically less than 0.2 dB. The presence of a large input signal temporarily forces the impedance of the diode to a much lower value, which produces an impedance mismatch that reflects the majority of the input signal power back towards its source. During the limiting process, a DC current is generated by the PIN limiter diode. The current is not the result of rectification, but is the result of charge carriers being forced into the I layer by the forward alternations of the large input signal. A complete path must be provided for this current or the diode is not capable of limiting. Therefore, an RF choke or similar structure must be provided to complete the path for DC current flow. The DC block capacitors shown in Figure 2 are optional; they protect the limiter diode from external DC voltage that may be present in the source or load circuits. A cross section of the suggested printed circuit board design is shown in Figure 3. 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. For more information about the operation of limiter diodes, refer to the Skyworks Application Note, PIN Limiter Diodes in Receiver Protectors, document number 200480. DC Block DC Block Input Output RF Choke Limiter PIN Figure 2. Single Stage Limiter Circuit CLA4611-085LF Thermal Via Y1465 Figure 3. Cross-Sectional View of Suggested Printed Circuit Board Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203346A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 8, 2015 3 DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE Typical Performance Characteristics 36 0 –2 32 –2 32 –4 28 –4 28 –6 24 –8 20 –10 16 –12 12 –14 8 –16 Output Power 4 –18 Insertion Loss 0 –20 0 4 8 12 16 20 24 28 32 36 40 Input Power (dBm) –6 24 –8 20 –10 16 –12 12 –14 8 –16 Output Power 4 High-Power Limiter Design Application The CLA4611-085LF PIN limiter diode is designed for shunt applications in receiver protection power limiter 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 CLA4611-085LF PIN limiter diode is shown in Figure 5. 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. –20 0 0 4 8 12 16 20 24 28 32 36 Input Power (dBm) Anode (Pin 3) Not to scale S1628i Figure 5. Cross-Sectional View of the CLA4611-085LF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 Y1468 The electrically equivalent circuit of the CLA4611-085LF PIN limiter diode is shown in Figure 6. 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 limiter diode. Encapsulated Epoxy Cathode (Pin 2) 44 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. CLA4608-085LF Die Anode (Pin 1) 40 Figure 5. Insertion Loss and Output Power vs Input Power (f = 2.6 GHz, Board Loss Included) The copper ground paddle minimizes the total thermal resistance between the I layer, which is the location where most heat is Bond Wire (2 Places) –18 Insertion Loss Y1467 Figure 4. Insertion Loss and Output Power vs Input Power (f = 1.0 GHz, Board Loss Included) Insertion loss (dB) 0 36 Output Power (dBm) 40 Insertion loss (dB) Output Power (dBm) (TA = 25 °C, Unless Otherwise Noted) April 8, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203346B DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE LSERIES LSERIES Pin 3 Pin 1 CPKG CPKG CLA4608-085LF Die LPADDLE Pin 2 S1629i Figure 6. CLA4611-085LF Electrically Equivalent Circuit 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 7. CLA4611-085LF PCB Layout Footprint Package Dimensions The PCB layout footprint for the CLA4611-085LF is shown in Figure 7. Typical part markings are shown in Figure 8. Package dimensions for the 3-pin QFN are provided in Figure 9, and Figure 10 provides the tape and reel dimensions. Package and Handling Information The CLA4611-085LF 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. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203346A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 8, 2015 5 DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE LQ Skyworks Part Number 3 1 Orientation Indicator 3 1 2 Y1466 Figure 8. Typical Part Markings (Top View) 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 9. CLA4611-085LF QFN Package Dimension Drawing Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 April 8, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203346B DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE ∅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 10. CLA4611-085LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203346A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 8, 2015 7 DATA SHEET • CLA4611-085LF: SURFACE MOUNT LIMITER DIODE Ordering Information Model Name CLA4611-085LF: Surface Mount Limiter Diode Manufacturing Part Number CLA4611-085LF Copyright © 2014-2015 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. 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