BSP52T1 Preferred Device NPN Small-Signal Darlington Transistor This NPN small signal darlington transistor is designed for use in switching applications, such as print hammer, relay, solenoid and lamp drivers. The device is housed in the SOT-223 package, which is designed for medium power surface mount applications. • The SOT-223 Package can be soldered using wave or reflow. The • • formed leads absorb thermal stress during soldering, eliminating the possibility of damage to the die Available in 12 mm Tape and Reel Use BSP52T1 to order the 7 inch/1000 unit reel PNP Complement is BSP62T1 http://onsemi.com MEDIUM POWER NPN SILICON SURFACE MOUNT DARLINGTON TRANSISTOR COLLECTOR 2,4 BASE 1 MAXIMUM RATINGS (TC = 25°C unless otherwise noted) Rating Symbol Max Unit Collector-Emitter Voltage VCES 80 Vdc Collector-Base Voltage VCBO 90 Vdc Emitter-Base Voltage VEBO 5.0 Vdc Collector Current IC 1.0 Adc Total Power Dissipation @ TA = 25°C (Note 1.) Derate above 25°C PD 0.8 Watts 6.4 mW/°C Total Power Dissipation @ TA = 25°C (Note 2.) Derate above 25°C Operating and Storage Temperature Range PD TJ, Tstg 1.25 Watts 10 mW/°C –65 to 150 °C EMITTER 3 4 1 2 3 SOT–223 CASE 318E STYLE 1 DEVICE MARKING THERMAL CHARACTERISTICS Characteristic Symbol Value Unit Thermal Resistance – Junction-to-Ambient (Note 1.) RθJA 156 °C/W Thermal Resistance – Junction-to-Ambient (Note 2.) RθJA 100 °C/W TL 260 °C 10 Sec Maximum Temperature for Soldering Purposes Time in Solder Bath LWW AS3 L WW AS3 1. Device mounted on a FR-4 glass epoxy printed circuit board using minimum recommended footprint. 2. Device mounted on a FR-4 glass epoxy printed circuit board using 1 cm2 pad. = Assembly Location = Date Code = Specific Device Code ORDERING INFORMATION Device BSP52T1 Package Shipping SOT–223 1000/Tape & Reel Preferred devices are recommended choices for future use and best overall value. Semiconductor Components Industries, LLC, 2001 January, 2001 – Rev. 2 1 Publication Order Number: BSP52T1/D BSP52T1 ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) Symbol Characteristics Min Max 90 – 5.0 – – 10 – 10 1000 2000 – – – 1.3 – 1.9 Unit OFF CHARACTERISTICS Collector-Base Breakdown Voltage (IC = 100 µAdc, IE = 0) V(BR)CBO Emitter-Base Breakdown Voltage (IE = 10 µAdc, IC = 0) V(BR)EBO Collector-Emitter Cutoff Current (VCE = 80 Vdc, VBE = 0) ICES Emitter-Base Cutoff Current (VEB = 4.0 Vdc, IC = 0) IEBO Vdc Vdc µAdc µAdc ON CHARACTERISTICS (Note 3.) hFE DC Current Gain (IC = 150 mAdc, VCE = 10 Vdc) (IC = 500 mAdc, VCE = 10 Vdc) Collector-Emitter Saturation Voltage (IC = 500 mAdc, IB = 0.5 mAdc) VCE(sat) Base-Emitter On Voltage (IC = 500 mAdc, IB = 0.5 mAdc) VBE(on) 3. Pulse Test: Pulse Width ≤ 300 µs, Duty Cycle ≤ 2.0% http://onsemi.com 2 – Vdc Vdc BSP52T1 INFORMATION FOR USING THE SOT-223 SURFACE MOUNT PACKAGE MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS Surface mount board layout is a critical portion of the total design. The footprint for the semiconductor packages must be the correct size to insure proper solder connection interface between the board and the package. With the correct pad geometry, the packages will self align when subjected to a solder reflow process. 0.15 3.8 0.079 2.0 0.091 2.3 0.248 6.3 0.091 2.3 0.079 2.0 0.059 1.5 0.059 1.5 0.059 1.5 inches mm SOT-223 SOT-223 POWER DISSIPATION Although the power dissipation can almost be doubled with this method, area is taken up on the printed circuit board which can defeat the purpose of using surface mount technology. A graph of RθJA versus collector pad area is shown in Figure 1. The power dissipation of the SOT-223 is a function of the pad size. This can vary from the minimum pad size for soldering to a pad size given for maximum power dissipation. Power dissipation for a surface mount device is determined by TJ(max), the maximum rated junction temperature of the die, RθJA, the thermal resistance from the device junction to ambient, and the operating temperature, TA. Using the values provided on the data sheet for the SOT-223 package, PD can be calculated as follows: R JA , Thermal Resistance, Junction to Ambient (C/W) PD = 160 Board Material = 0.0625″ G10/FR4, 2 oz Copper 140 TJ(max) – TA TA = 25°C 0.8 Watts ° 120 RθJA The values for the equation are found in the maximum ratings table on the data sheet. Substituting these values into the equation for an ambient temperature TA of 25°C, one can calculate the power dissipation of the device which in this case is 0.8 watts. 1.25 Watts* 1.5 Watts 100 θ 80 0.0 PD = 150°C – 25°C = 0.8 watts 156°C/W *Mounted on the DPAK footprint 0.2 0.4 0.6 A, Area (square inches) 0.8 1.0 Figure 1. Thermal Resistance versus Collector Pad Area for the SOT-223 Package (Typical) The 156°C/W for the SOT-223 package assumes the use of the recommended footprint on a glass epoxy printed circuit board to achieve a power dissipation of 0.8 watts. There are other alternatives to achieving higher power dissipation from the SOT-223 package. One is to increase the area of the collector pad. By increasing the area of the collector pad, the power dissipation can be increased. Another alternative would be to use a ceramic substrate or an aluminum core board such as Thermal Clad. Using a board material such as Thermal Clad, an aluminum core board, the power dissipation can be doubled using the same footprint. http://onsemi.com 3 BSP52T1 SOLDER STENCIL GUIDELINES or stainless steel with a typical thickness of 0.008 inches. The stencil opening size for the SOT-223 package should be the same as the pad size on the printed circuit board, i.e., a 1:1 registration. Prior to placing surface mount components onto a printed circuit board, solder paste must be applied to the pads. A solder stencil is required to screen the optimum amount of solder paste onto the footprint. The stencil is made of brass SOLDERING PRECAUTIONS • The soldering temperature and time should not exceed 260°C for more than 10 seconds. • When shifting from preheating to soldering, the maximum temperature gradient should be 5°C or less. • After soldering has been completed, the device should be allowed to cool naturally for at least three minutes. Gradual cooling should be used as the use of forced cooling will increase the temperature gradient and result in latent failure due to mechanical stress. • Mechanical stress or shock should not be applied during cooling The melting temperature of solder is higher than the rated temperature of the device. When the entire device is heated to a high temperature, failure to complete soldering within a short time could result in device failure. Therefore, the following items should always be observed in order to minimize the thermal stress to which the devices are subjected. • Always preheat the device. • The delta temperature between the preheat and soldering should be 100°C or less.* • When preheating and soldering, the temperature of the leads and the case must not exceed the maximum temperature ratings as shown on the data sheet. When using infrared heating with the reflow soldering method, the difference should be a maximum of 10°C. * Soldering a device without preheating can cause excessive thermal shock and stress which can result in damage to the device. TYPICAL SOLDER HEATING PROFILE The line on the graph shows the actual temperature that might be experienced on the surface of a test board at or near a central solder joint. The two profiles are based on a high density and a low density board. The Vitronics SMD310 convection/infrared reflow soldering system was used to generate this profile. The type of solder used was 62/36/2 Tin Lead Silver with a melting point between 177–189°C. When this type of furnace is used for solder reflow work, the circuit boards and solder joints tend to heat first. The components on the board are then heated by conduction. The circuit board, because it has a large surface area, absorbs the thermal energy more efficiently, then distributes this energy to the components. Because of this effect, the main body of a component may be up to 30 degrees cooler than the adjacent solder joints. For any given circuit board, there will be a group of control settings that will give the desired heat pattern. The operator must set temperatures for several heating zones, and a figure for belt speed. Taken together, these control settings make up a heating “profile” for that particular circuit board. On machines controlled by a computer, the computer remembers these profiles from one operating session to the next. Figure 2 shows a typical heating profile for use when soldering a surface mount device to a printed circuit board. This profile will vary among soldering systems but it is a good starting point. Factors that can affect the profile include the type of soldering system in use, density and types of components on the board, type of solder used, and the type of board or substrate material being used. This profile shows temperature versus time. http://onsemi.com 4 BSP52T1 STEP 1 PREHEAT ZONE 1 RAMP" 200°C STEP 2 STEP 3 VENT HEATING SOAK" ZONES 2 & 5 RAMP" DESIRED CURVE FOR HIGH MASS ASSEMBLIES 150°C STEP 5 STEP 6 STEP 7 STEP 4 HEATING VENT COOLING HEATING ZONES 3 & 6 ZONES 4 & 7 205° TO SPIKE" SOAK" 219°C 170°C PEAK AT SOLDER 160°C JOINT 150°C 100°C 140°C 100°C SOLDER IS LIQUID FOR 40 TO 80 SECONDS (DEPENDING ON MASS OF ASSEMBLY) DESIRED CURVE FOR LOW MASS ASSEMBLIES 50°C TMAX TIME (3 TO 7 MINUTES TOTAL) Figure 2. Typical Solder Heating Profile http://onsemi.com 5 BSP52T1 PACKAGE DIMENSIONS SOT–223 CASE 318E–04 ISSUE K A F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 4 S 1 2 3 B D L G J C 0.08 (0003) H M K http://onsemi.com 6 INCHES DIM MIN MAX A 0.249 0.263 B 0.130 0.145 C 0.060 0.068 D 0.024 0.035 F 0.115 0.126 G 0.087 0.094 H 0.0008 0.0040 J 0.009 0.014 K 0.060 0.078 L 0.033 0.041 M 0 10 S 0.264 0.287 STYLE 1: PIN 1. 2. 3. 4. BASE COLLECTOR EMITTER COLLECTOR MILLIMETERS MIN MAX 6.30 6.70 3.30 3.70 1.50 1.75 0.60 0.89 2.90 3.20 2.20 2.40 0.020 0.100 0.24 0.35 1.50 2.00 0.85 1.05 0 10 6.70 7.30 BSP52T1 Notes http://onsemi.com 7 BSP52T1 Thermal Clad is a trademark of the Bergquist Company ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION NORTH AMERICA Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada Email: [email protected] Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada N. 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