LP395
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SNOSBF3B –MAY 2004–REVISED MAY 2005
LP395 Ultra Reliable Power Transistor
Check for Samples: LP395
1FEATURES • 0.5 μA typical base current
• Directly interfaces with TTL or CMOS
2• Internal thermal limiting • +36 Volts on base causes no damage
• Internal current and power limiting • 2 μs switching time
• Guaranteed 100 mA output current
DESCRIPTION
The LP395 is a fast monolithic transistor with complete overload protection. This very high gain transistor has
included on the chip, current limiting, power limiting, and thermal overload protection, making it difficult to destroy
from almost any type of overload. Available in an epoxy TO-92 transistor package this device is guaranteed to
deliver 100 mA.
Thermal limiting at the chip level, a feature not available in discrete designs, provides comprehensive protection
against overload. Excessive power dissipation or inadequate heat sinking causes the thermal limiting circuitry to
turn off the device preventing excessive die temperature.
The LP395 offers a significant increase in reliability while simplifying protection circuitry. It is especially attractive
as a small incandescent lamp or solenoid driver because of its low drive requirements and blowout-proof design.
The LP395 is easy to use and only a few precautions need be observed. Excessive collector to emitter voltage
can destroy the LP395 as with any transistor. When the device is used as an emitter follower with a low source
impedance, it is necessary to insert a 4.7 kΩresistor in series with the base lead to prevent possible emitter
follower oscillations. Also since it has good high frequency response, supply by-passing is recommended.
Areas where the LP395 differs from a standard NPN transistor are in saturation voltage, leakage (quiescent)
current and in base current. Since the internal protection circuitry requires voltage and current to function, the
minimum voltage across the device in the on condition (saturated) is typically 1.6 Volts, while in the off condition
the quiescent (leakage) current is typically 200 μA. Base current in this device flows out of the base lead, rather
than into the base as is the case with conventional NPN transistors. Also the base can be driven positive up to
36 Volts without damage, but will draw current if driven negative more than 0.6 Volts. Additionally, if the base
lead is left open, the LP395 will turn on.
The LP395 is a low-power version of the 1-Amp LM195/LM295/LM395 Ultra Reliable Power Transistor.
The LP395 is rated for operation over a −40°C to +125°C range.
Connection Diagram
TO-92 Package
Figure 1. Order Number LP395Z
See NS Package Z03A
1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2004–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LP395
SNOSBF3B –MAY 2004–REVISED MAY 2005
www.ti.com
Typical Applications
Figure 2. Fully Protected Lamp Driver
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings (1)
Collector to Emitter Voltage 36V
Collector to Base Voltage 36V
Base to Emitter Voltage (Forward) 36V
Base to Emitter Voltage (Reverse) 10V
Base to Emitter Current (Reverse) 20 mA
Collector Current Limit Internally Limited
Power Dissipation Internally Limited
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Lead Temp. (Soldering, 10 seconds) 260°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not guarantee specific performance limits.
2Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated
Product Folder Links: LP395
LP395
www.ti.com
SNOSBF3B –MAY 2004–REVISED MAY 2005
Electrical Characteristics Tested Design Units
Symbol Parameter Conditions Typical Limit Limit (Limit)
(1) (2)
VCE Collector to Emitter 0.5 mA ≤IC≤100 mA 36 36 V(Max)
Operating Voltage (3)
ICL Collector Current Limit VBE = 2V, VCE = 36V 45 25 20 mA(Min)
(4) VBE = 2V, VCE = 15V 90 60 50 mA(Min)
VBE = 2V, 2V ≤VCE ≤6V 130 100 100 mA(Min)
IBBase Current 0 ≤IC≤100 mA −0.3 −2.0 −2.5 μA(Max)
IQQuiescent Current VBE = 0V, 0 ≤VCE ≤36V 0.24 0.50 0.60 mA(Max)
VCE(SAT) Saturation Voltage VBE = 2V, IC= 100 mA 1.82 2.00 2.10 V(Max)
BVBE Base to Emitter Break- 0 ≤VCE ≤36V, IB= 2 μA 36 36 V(Min)
down Voltage (4)
VBE Base to Emitter Voltage IC= 5 mA 0.69 0.79 0.90 V(Max)
(5) IC= 100 mA (4) 1.02 1.40 V (Max)
tSSwitching Time VCE = 20V, RL= 200Ω2μs
VBE = 0V, +2V, 0V
θJA Thermal Resistance 0.4″leads soldered to 150 180 °C/W
Junction to Ambient printed circuit board (Max)
0.125″leads soldered to 130 160 °C/W
printed circuit board (Max)
(1) Guaranteed and 100% production tested.
(2) Guaranteed (but not 100% production tested) over the operating temperature and supply voltage ranges. These limits are not used to
calculate outgoing quality levels.
(3) Parameters identified with boldface type apply at temp. extremes. All other numbers, unless noted apply at +25°C.
(4) These numbers apply for pulse testing with a low duty cycle.
(5) Base positive with respect to emitter.
Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LP395
LP395
SNOSBF3B –MAY 2004–REVISED MAY 2005
www.ti.com
Simplified Circuit
Applications Information
One failure mode incandescent lamps may experience is one in which the filament resistance drops to a very low
value before it actually blows out. This is especially rough on most solid-state lamp drivers and in most cases a
lamp failure of this type will also cause the lamp driver to fail. Because of its high gain and blowout-proof design,
the LP395 is an ideal candidate for reliably driving small incandescent lamps. Additionally, the current limiting
characteristics of the LP395 are advantageous as it serves to limit the cold filament inrush current, thus
increasing lamp life.
4Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated
Product Folder Links: LP395
LP395
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SNOSBF3B –MAY 2004–REVISED MAY 2005
Typical Performance Characteristics
5 Volt Transfer Function 36 Volt Transfer Function
Collector Characteristics Available Collector Current
Quiescent Collector Current Saturation Voltage
Collector Current Threshold
Typical Applications
Figure 3. Lamp Flasher
(Short Circuit Proof)
Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LP395
PACKAGE OPTION ADDENDUM
www.ti.com 17-Nov-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Samples
(Requires Login)
LP395Z/LFT1 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) Call TI Level-1-NA-UNLIM
LP395Z/LFT4 ACTIVE TO-92 LP 3 2000 TBD Call TI Call TI
LP395Z/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) Call TI Level-1-NA-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
MECHANICAL DATA
MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LP (O-PBCY-W3) PLASTIC CYLINDRICAL PACKAGE
4040001-2/C 10/01
STRAIGHT LEAD OPTION
0.016 (0,41)
0.014 (0,35)
0.157 (4,00) MAX
FORMED LEAD OPTION
0.104 (2,65)
0.210 (5,34)
0.170 (4,32)
0.050 (1,27)
0.016 (0,41)
0.022 (0,56)
0.500 (12,70) MIN
Seating
Plane
0.175 (4,44)
0.205 (5,21) 0.165 (4,19)
0.125 (3,17)
DIA
D
C
0.105 (2,67)
0.095 (2,41)
0.135 (3,43) MIN
0.080 (2,03)
0.055 (1,40)
0.045 (1,14)
1
0.105 (2,67)
23
0.080 (2,03)
0.105 (2,67)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Lead dimensions are not controlled within this area
D. FAlls within JEDEC TO -226 Variation AA (TO-226 replaces TO-92)
E. Shipping Method:
Straight lead option available in bulk pack only.
Formed lead option available in tape & reel or ammo pack.
MECHANICAL DATA
MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LP (O-PBCY-W3) PLASTIC CYLINDRICAL PACKAGE
4040001-3/C 10/01
0.094 (2,40)
0.114 (2,90)
0.460 (11,70)
0.539 (13,70)
TAPE & REEL
0.335 (8,50)
0.384 (9,75)
0.020 (0,50) MIN
0.217 (5,50)
0.748 (19,00) 0.748 (19,00)
0.689 (17,50)
0.098 (2,50)
0.433 (11,00)
0.335 (8,50)
0.610 (15,50)
0.650 (16,50)
1.260 (32,00)
0.905 (23,00)
0.234 (5,95)
0.266 (6,75)
0.512 (13,00)
0.488 (12,40)
0.114 (2,90)
0.094 (2,40) 0.146 (3,70)
0.169 (4,30) DIA
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Tape and Reel information for the Format Lead Option package.
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