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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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Schottky Barrier Diode
These Schottky barrier diodes are designed for high speed switching applications, circuit protection, and voltage clamping. Extremely low forward voltage reduces conduction loss. Miniature surface mount package is excellent for hand held and portable applications where space is limited. * Extremely Fast Switching Speed * Extremely Low Forward Voltage -- 0.28 Volts (Typ) @ IF = 10 mAdc
MMBD451LT1
Motorola Preferred Device
20 VOLT SCHOTTKY BARRIER DETECTOR AND SWITCHING DIODE
3 CATHODE
2 ANODE
1 2
3
CASE 419 - 02, STYLE 2 SOT- 323 (SC - 70)
MAXIMUM RATINGS (TJ = 125C unless otherwise noted)
Rating Peak Reverse Voltage Reverse Voltage Forward Power Dissipation @ TA = 25C Derate above 25C Operating Junction Temperature Range Storage Temperature Range Symbol VRM VR PF 200 1.6 TJ - 55 to +150 Tstg - 55 to +150 C mW mW/C C Value 20 10 Unit Volts Volts
ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted)
Characteristic Total Capacitance (VR = 100 V, f = 1.0 MHz) Reverse Current (VR = 10 V) Forward Voltage (IF = 10 mAdc) (IF = 100 mAdc) Symbol CT IR VF -- -- 0.28 0.45 0.34 0.55 Min -- -- Typ 6.0 1.0 Max -- 30 Unit pF mAdc Vdc
Thermal Clad is a registered trademark of the Bergquist Company.
Preferred devices are Motorola recommended choices for future use and best overall value.
Motorola Small-Signal Transistors, FETs and Diodes Device Data (c) Motorola, Inc. 1997
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MMBD451LT1
820 +10 V 2k 100 H 0.1 F DUT 50 OUTPUT PULSE GENERATOR 50 INPUT SAMPLING OSCILLOSCOPE 90% VR INPUT SIGNAL IR iR(REC) = 1 mA OUTPUT PULSE (IF = IR = 10 mA; measured at iR(REC) = 1 mA) IF 0.1 F tr 10% tp t IF trr t
Notes: 1. A 2.0 k variable resistor adjusted for a Forward Current (IF) of 10 mA. Notes: 2. Input pulse is adjusted so IR(peak) is equal to 10 mA. Notes: 3. tp trr
Figure 1. Recovery Time Equivalent Test Circuit
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Motorola Small-Signal Transistors, FETs and Diodes Device Data
MMBD451LT1
INFORMATION FOR USING THE SOT-323 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
0.025 0.65
interface between the board and the package. With the correct pad geometry, the packages will self align when subjected to a solder reflow process.
0.025 0.65
0.075 1.9 0.035 0.9 0.028 0.7 inches mm
SC-70/SOT-323 POWER DISSIPATION
The power dissipation of the SC-70/SOT-323 is a function of the collector pad size. This can vary from the minimum pad size for soldering to the 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, RJA, the thermal resistance from the device junction to ambient; and the operating temperature, TA. Using the values provided on the data sheet, PD can be calculated as follows. PD = TJ(max) - TA RJA
SOLDERING PRECAUTIONS
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 100C 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 10C. * The soldering temperature and time should not exceed 260C for more than 10 seconds. * When shifting from preheating to soldering, the maximum temperature gradient should be 5C 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 excessive thermal shock and stress which can result in damage to the device.
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 25C, one can calculate the power dissipation of the device which in this case is 200 milliwatts. PD = 150C - 25C 0.625C/W = 200 milliwatts
The 0.625C/W assumes the use of the recommended footprint on a glass epoxy printed circuit board to achieve a power dissipation of 200 milliwatts. There are other alternatives to achieving higher power dissipation from the SC-70/SOT-323 package. Another alternative would be to use a ceramic substrate or an aluminum core board such as Thermal CladTM. Using a board material such as Thermal Clad, a power dissipation of 300 milliwatts can be achieved using the same footprint.
Motorola Small-Signal Transistors, FETs and Diodes Device Data
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MMBD451LT1
PACKAGE DIMENSIONS
A L
3
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. INCHES MIN MAX 0.071 0.087 0.045 0.053 0.035 0.049 0.012 0.016 0.047 0.055 0.000 0.004 0.004 0.010 0.017 REF 0.026 BSC 0.028 REF 0.031 0.039 0.079 0.087 0.012 0.016 MILLIMETERS MIN MAX 1.80 2.20 1.15 1.35 0.90 1.25 0.30 0.40 1.20 1.40 0.00 0.10 0.10 0.25 0.425 REF 0.650 BSC 0.700 REF 0.80 1.00 2.00 2.20 0.30 0.40
S
1 2
B
V G
D
C 0.05 (0.002)
RN K
J
DIM A B C D G H J K L N R S V
H
STYLE 2: PIN 1. ANODE 2. N.C. 3. CATHODE
CASE 419-02 ISSUE H SOT-323 (SC-70)
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola 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 consequential or incidental damages. "Typical" parameters which may be provided in Motorola 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. Motorola does not convey any license under its patent rights nor the rights of others. Motorola 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 Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 - http://sps.motorola.com/mfax/ HOME PAGE: http://motorola.com/sps/ JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
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MMBD451LT1/D Motorola Small-Signal Transistors, FETs and Diodes Device Data

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