ON Semiconductor Dual Hot-Carrier Diodes MMBD452LT1 Schottky Barrier Diodes ON Semiconductor Preferred Devices These devices are designed primarily for high–efficiency UHF and VHF detector applications. They are readily adaptable to many other fast switching RF and digital applications. They are supplied in an inexpensive plastic package for low–cost, high–volume consumer and industrial/commercial requirements. 30 VOLTS DUAL HOT–CARRIER DETECTOR AND SWITCHING DIODES • Extremely Low Minority Carrier Lifetime • Very Low Capacitance • Low Reverse Leakage 3 1 MAXIMUM RATINGS (TJ = 125°C unless otherwise noted) Rating 2 Symbol Value Unit Reverse Voltage VR 30 Volts Forward Power Dissipation @ TA = 25°C Derate above 25°C PF 225 1.8 mW mW/°C Operating Junction Temperature Range TJ CASE 318–08, STYLE 11 SOT–23 (TO–236AB) 1 ANODE °C 3 CATHODE/ANODE –55 to +125 Storage Temperature Range Tstg °C –55 to +150 2 CATHODE DEVICE MARKING MMBD452LT1 = 5N ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) (EACH DIODE) Characteristic Symbol Min Typ Max Unit V(BR)R 30 — — Volts Total Capacitance (VR = 15 V, f = 1.0 MHz) Figure 1 CT — 0.9 1.5 pF Reverse Leakage (VR = 25 V) Figure 3 IR — 13 200 nAdc Forward Voltage (IF = 1.0 mAdc) Figure 4 VF — 0.38 0.45 Vdc Forward Voltage (IF = 10 mAdc) Figure 4 VF — 0.52 0.6 Vdc Reverse Breakdown Voltage (IR = 10 µA) Preferred devices are ON Semiconductor recommended choices for future use and best overall value. Semiconductor Components Industries, LLC, 2001 November, 2001 – Rev. 2 1 Publication Order Number: MMBD452LT1/D MMBD452LT1 TYPICAL ELECTRICAL CHARACTERISTICS 500 f = 1.0 MHz 2.4 , MINORITY CARRIER LIFETIME (ps) C T, TOTAL CAPACITANCE (pF) 2.8 2.0 1.6 1.2 0.8 0.4 0 0 3.0 6.0 18 9.0 12 15 21 VR, REVERSE VOLTAGE (VOLTS) 24 27 400 KRAKAUER METHOD 300 200 100 0 30 0 Figure 1. Total Capacitance 30 40 50 60 70 IF, FORWARD CURRENT (mA) 80 90 100 100 TA = 100°C 1.0 IF, FORWARD CURRENT (mA) IR, REVERSE LEAKAGE ( A) 20 Figure 2. Minority Carrier Lifetime 10 75°C 0.1 25°C 0.01 0.001 10 0 6.0 12 18 VR, REVERSE VOLTAGE (VOLTS) 24 10 1.0 0.1 30 TA = 25°C 0.2 Figure 3. Reverse Leakage IF(PEAK) TA = -40°C TA = 85°C 0.4 0.6 0.8 VF, FORWARD VOLTAGE (VOLTS) 1.0 Figure 4. Forward Voltage CAPACITIVE CONDUCTION IR(PEAK) FORWARD CONDUCTION SINUSOIDAL GENERATOR BALLAST NETWORK (PADS) STORAGE CONDUCTION PADS DUT Figure 5. Krakauer Method of Measuring Lifetime http://onsemi.com 2 SAMPLING OSCILLOSCOPE (50 INPUT) 1.2 MMBD452LT1 INFORMATION FOR USING THE SOT–23 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. 0.037 0.95 0.037 0.95 0.079 2.0 0.035 0.9 0.031 0.8 inches mm SOT–23 SOT–23 POWER DISSIPATION SOLDERING PRECAUTIONS The power dissipation of the SOT–23 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–23 package, PD can be calculated as follows: PD = 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 shall be a maximum of 10°C. • The soldering temperature and time shall not exceed 260°C for more than 10 seconds. • When shifting from preheating to soldering, the maximum temperature gradient shall 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. * Soldering a device without preheating can cause excesi h l h k d hi h l i d TJ(max) – TA 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 225 milliwatts. PD = 150°C – 25°C 556°C/W = 225 milliwatts The 556°C/W for the SOT–23 package assumes the use of the recommended footprint on a glass epoxy printed circuit board to achieve a power dissipation of 225 milliwatts. There are other alternatives to achieving higher power dissipation from the SOT–23 package. 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 MMBD452LT1 PACKAGE DIMENSIONS SOT–23 (TO–236AB) CASE 318–08 ISSUE AF NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. A L 3 1 V B S 2 DIM A B C D G H J K L S V G C D H J K INCHES MIN MAX 0.1102 0.1197 0.0472 0.0551 0.0350 0.0440 0.0150 0.0200 0.0701 0.0807 0.0005 0.0040 0.0034 0.0070 0.0140 0.0285 0.0350 0.0401 0.0830 0.1039 0.0177 0.0236 MILLIMETERS MIN MAX 2.80 3.04 1.20 1.40 0.89 1.11 0.37 0.50 1.78 2.04 0.013 0.100 0.085 0.177 0.35 0.69 0.89 1.02 2.10 2.64 0.45 0.60 STYLE 11: PIN 1. ANODE 2. CATHODE 3. CATHODE-ANODE 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 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] JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031 Phone: 81–3–5740–2700 Email: [email protected] ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800–282–9855 Toll Free USA/Canada http://onsemi.com 4 MMBD452LT1/D