Order this document by BAT54WT1/D SEMICONDUCTOR TECHNICAL DATA 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. Motorola Preferred Device • Extremely Fast Switching Speed 30 VOLTS SCHOTTKY BARRIER DETECTOR AND SWITCHING DIODE • Extremely Low Forward Voltage — 0.35 Volts (Typ) @ IF = 10 mAdc 3 CATHODE 3 1 ANODE 1 2 CASE 419 – 02, STYLE 2 SOT– 323 (SC – 70) MAXIMUM RATINGS (TJ = 125°C unless otherwise noted) Symbol Value Unit Reverse Voltage VR 30 Volts Forward Power Dissipation @ TA = 25°C Derate above 25°C PF 200 1.6 mW mW/°C Forward Current (DC) IF 200 Max mA Junction Temperature TJ 125 Max °C Tstg – 55 to +150 °C Rating Storage Temperature Range DEVICE MARKING BAT54WT1 = B4 ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) Symbol Min Typ Max Unit V(BR)R 30 — — Volts Total Capacitance (VR = 1.0 V, f = 1.0 MHz) CT — 7.6 10 pF Reverse Leakage (VR = 25 V) IR — 0.5 2.0 µAdc Forward Voltage (IF = 0.1 mAdc) VF — 0.22 0.24 Vdc Forward Voltage (IF = 30 mAdc) VF — 0.41 0.5 Vdc Forward Voltage (IF = 100 mAdc) VF — 0.52 1.0 Vdc Reverse Recovery Time (IF = IR = 10 mAdc, IR(REC) = 1.0 mAdc) Figure 1 trr — — 5.0 ns Forward Voltage (IF = 1.0 mAdc) VF — 0.29 0.32 Vdc Forward Voltage (IF = 10 mAdc) VF — 0.35 0.40 Vdc Forward Current (DC) IF — — 200 mAdc Repetitive Peak Forward Current IFRM — — 300 mAdc Non–Repetitive Peak Forward Current (t < 1.0 s) IFSM — — 600 mAdc Characteristic Reverse Breakdown Voltage (IR = 10 µA) Thermal Clad is a registered trademark of the Bergquist Company. Preferred devices are Motorola recommended choices for future use and best overall value. REV 3 Motorola Small–Signal Transistors, FETs and Diodes Device Data Motorola, Inc. 1997 1 BAT54WT1 820 Ω +10 V 2k 0.1 µF tr IF 100 µH tp 0.1 µF IF t trr 10% t DUT 50 Ω OUTPUT PULSE GENERATOR 50 Ω INPUT SAMPLING OSCILLOSCOPE 90% IR VR iR(REC) = 1 mA OUTPUT PULSE (IF = IR = 10 mA; measured at iR(REC) = 1 mA) INPUT SIGNAL Notes: 1. A 2.0 kΩ 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 100 1000 IR , REVERSE CURRENT (µA) IF, FORWARD CURRENT (mA) TA = 150°C 1 50°C 10 1 25°C 1.0 85°C 25°C 0.1 0.0 – 40°C 100 TA = 125°C 10 1.0 TA = 85°C 0.1 0.01 – 55°C TA = 25°C 0.001 0.1 0.2 0.3 0.4 0.5 0 0.6 5 VF, FORWARD VOLTAGE (VOLTS) Figure 2. Forward Voltage 10 15 20 VR, REVERSE VOLTAGE (VOLTS) 25 30 Figure 3. Leakage Current C T , TOTAL CAPACITANCE (pF) 14 12 10 8 6 4 2 0 0 5 10 15 20 25 30 VR, REVERSE VOLTAGE (VOLTS) Figure 4. Total Capacitance 2 Motorola Small–Signal Transistors, FETs and Diodes Device Data BAT54WT1 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 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 0.025 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, RθJA, 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 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 200 milliwatts. PD = 150°C – 25°C 0.625°C/W = 200 milliwatts The 0.625°C/W assumes the use of the recommended footprint on a glass epoxy printed circuit board to achieve a power dissipation of 200 milliwatts. 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, a power dissipation of 300 milliwatts can be achieved using the same footprint. 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 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. • 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 * Soldering a device without preheating can cause excessive thermal shock and stress which can result in damage to the device. Motorola Small–Signal Transistors, FETs and Diodes Device Data 3 BAT54WT1 PACKAGE DIMENSIONS A NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. L 3 B S 1 2 D V G C 0.05 (0.002) R N J K H DIM A B C D G H J K L N R S V 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 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. 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