|Category||Discrete => Diodes & Rectifiers => Switching Diodes => Small Signal|
|Description||Dual Switching Diode|
|Datasheet||Download BAW56W datasheet
|Cross ref.||Similar parts: M1MA141WAT1, M1MA141WA, M1MA142WAT1, DAP202U, CMSD2836, M1MA142WA, 1SS300, 1PS300, BAW56WT1|
Rating Reverse Voltage Forward Current Peak Forward Surge Current Symbol VR IF IFM(surge) Max 200 500 Unit Vdc mAdc
Characteristic Total Device Dissipation FR = 25°C Derate above 25°C Thermal Resistance, Junction to Ambient Total Device Dissipation Alumina = 25°C Derate above 25°C Thermal Resistance, Junction to Ambient Junction and Storage Temperature Symbol PD Max 200 1.6 RqJA 300 2.4 RqJA TJ, Tstg to +150 Unit mW mW/°C °C/W mW mW/°C °C/W °C
Reverse Breakdown Voltage (I(BR) = 100 µAdc) Reverse Voltage Leakage Current (VR = 25 Vdc, = 150°C) (VR = 70 Vdc) (VR = 70 Vdc, = 150°C) Diode Capacitance (VR = 1.0 MHz) Forward Voltage (IF = 1.0 mAdc) (IF = 10 mAdc) (IF = 60 mAdc) (IF = 150 mAdc) Reverse Recovery Time (IF = 10 mAdc, 100 , IR(REC) = 1.0 mAdc) (Figure 1) 1. FR Alumina 0.4 0.3 V(BR) CD VF trr ns pF mVdc 70 Vdc µAdcPreferred devices are Motorola recommended choices for future use and best overall value.
Motorola SmallSignal Transistors, FETs and Diodes Device Data © Motorola, Inc. 1997
0.1 µF DUT 50 OUTPUT PULSE GENERATOR 50 INPUT SAMPLING OSCILLOSCOPE VR INPUT SIGNAL 90% IR iR(REC) 1.0 mA OUTPUT PULSE (IF = 10 mA; MEASURED at iR(REC) = 1.0 mA) t IF trr t
Notes: 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: tp » trrFigure 1. Recovery Time Equivalent Test Circuit
IR , REVERSE CURRENT (µA) IF, FORWARD CURRENT (mA)
Motorola SmallSignal Transistors, FETs and Diodes Device Data
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.
The power dissipation of the 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 the equation for an ambient temperature of 25°C, one can calculate the power dissipation of the device which in this case is 200 milliwatts. = 200 milliwatts
The values for the equation are found in the maximum ratings table on the data sheet. Substituting these values into
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 CladTM. Using a board material such as Thermal Clad, a power dissipation of 300 milliwatts can be achieved using the same footprint.
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 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 When shifting from preheating to soldering, the 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. maximum temperature gradient should 5°C or less. 260°C for more than 10 seconds.
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