LM338K STEEL Original New National Semiconductor Transistor ST-39 For Sale
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LM338K STEEL Original New National Semiconductor Transistor ST-39:
$19.99
This is for 1- LM338K STEEL Original New National Semiconductor Transistor from my parts bins.
The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5A over to 32V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. Careful circuit design has resulted in outstanding load and line regulation comparable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transistor package. A unique feature of the LM138 family is time-dependent current limiting. The current limit circuitry allows peak currents to be drawn from the regulator for short periods of time. This allows the to be used with heavy transient loads and speeds start-up under full-load conditions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Overload protection remains functional even if the adjustment pin is accidentally disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase the regulator's ripple rejection. Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., do not short-circuit output to ground. The part numbers in the LM138 series which have a K suffix are packaged in a standard Steel TO-3 package, while those with a T suffix are packaged a TO-220 plastic package. The LM138 is rated for TJ +150°C, and the LM338 is rated for TJ 7A peak output current Guaranteed 5A output current Adjustable output down to 1.2V Guaranteed thermal regulation Current limit constant with temperature P+ Product Enhancement tested Output is short-circuit protected
Applications
n Adjustable power supplies n Constant current regulators n Battery chargers
(See Physical Dimension section for further information) (TO-220) Plastic Package
Front View Order Number LM338T See NS Package Number T03B
Bottom View Order Number LM138K STEEL or LM338K STEEL See NS Package Number K02A
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) Power Dissipation Input/Output Voltage Differential Storage Temperature Internally limited to +150°C
Lead Temperature Metal Package (Soldering, 10 seconds) Plastic Package (Soldering, 4 seconds) ESD Tolerance
Specifications with standard type face are for = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN - VOUT = 5V; and IOUT = 10 mA. (Note 2) Symbol VREF VRLINE VRLOAD Parameter Reference Voltage Line Regulation Load Regulation Thermal Regulation IADJ VR/T ILOAD(Min) ICL Adjustment Pin Current Adjustment Pin Current Change Temperature Stability Minimum Load Current Limit 10 mA IOUT 5A, 3V (VIN - VOUT) 35V TMIN TJ TMAX VIN - VOUT = 35V VIN - VOUT 0.5 ms Peak VIN - VOUT 30V VN RMS Output Noise, % of VOUT Ripple Rejection Ratio Long-Term Stability JC JA Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient (No Heat Sink) K Package 35 °C/W f 10 kHz VOUT = 120 Hz, CADJ 0 µF VOUT = 120 Hz, CADJ 125°C, 1000 Hrs K Package dB % °C/W mA Conditions Min 3V (VIN - VOUT) 10 mA IOUT 50W 3V (VIN - VOUT) 35V (Note 10 mA IOUT 5A (Note 20 ms Pulse %/V % %/W 1.19 LM138 Typ 1.24 Max 1.29 V Units
Symbol VREF VRLINE VRLOAD Parameter Reference Voltage Line Regulation Load Regulation Thermal Regulation IADJ Adjustment Pin Current Adjustment Pin Current Change 10 mA IOUT 5A, 3V (VIN - VOUT) 35V
Conditions Min 3V (VIN - VOUT) 10 mA IOUT 50W 3V (VIN - VOUT) 35V (Note 10 mA IOUT 5A (Note 20 ms Pulse 1.19
Symbol VR/T ILOAD(Min) ICL Parameter Temperature Stability Minimum Load Current Limit
(Continued) Conditions Min TMIN TJ TMAX VIN - VOUT = 35V VIN - VOUT 0.5 ms Peak VIN - VOUT dB % °C/W LM338 Typ 3.5 10 Max % mA Units
RMS Output Noise, % of VOUT Ripple Rejection Ratio Long-Term Stability
f 10 kHz VOUT = 120 Hz, CADJ 0 µF VOUT = 120 Hz, CADJ 125°C, 1000 hrs K Package T Package K Package T Package
Thermal Resistance Junction to Case Thermal Resistance, Junction to Ambient (No Heat Sink)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: These specifications are applicable for power dissipations to 50W for the TO-3 (K) package and 25W for the TO-220 (T) package. Power dissipation is guaranteed at these values to 15V input-output differential. Above 15V differential, power dissipation will be limited by internal protection circuitry. All limits (i.e., the numbers in the Min. and Max. columns) are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 3: Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specifications for thermal regulation. Note 4: Refer to RETS138K drawing for military specifications of LM138K.
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