Littelfuse LT User Manual

Page 1

LT Series

POLYFUSE® Resettable PTCs

Axial Lead Battery Strap Type > LT Series

Description

The new LT Series device provides reliable, noncycling protection against overcharging and short circuits events for rechargeable battery cells where resettable protection is desired.

Features

• Low resistance

• Provides overcurrent protection at 100°C trip temperature

Agency Approvals

AGENCY AGENCY FILE NUMBER

E183209

R50119583

• RoHS compliant and lead–free

• Weldable Nickel terminals

• Compact design saves board space

Applications

• Rechargeable battery cell protection

- Mobile phones

- Laptop computers

Electrical Characteristics

Part Number

hold

(A)

I (A)

trip

(Vdc)

max

(A)

max

max.

(W)

Maximum Time

Current

(A)

To Trip

Time

(Sec.)

(Ω)

min

Resistance

typ

(Ω)

1max

(Ω)

15LT070 0.7 1.5 15 100 1.0 3.50 5.00 0.100 0.200 0.340

15LT070S 0.7 1.5 15 100 1.0 3.50 5.00 0.100 0.200 0.340

24LT100 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260

24LT100S 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260

24LT100SS 1.0 2.5 24 100 1.5 5.00 7.00 0.070 0.130 0.260

24LT180 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120

24LT180S 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120

24LT180SS 1.8 3.8 24 100 2.0 9.00 2.90 0.040 0.068 0.120

24LT190 1.9 4.2 24 100 1.9 10.00 3.00 0.030 0.057 0.100

24LT190S 1.9 4.2 24 100 1.9 10.00 3.00 0.030 0.057 0.100

24LT260 2.6 5.2 24 100 2.3 13.0 5.0 0.025 0.042 0.076

24LT300 3.0 6.3 24 100 2.0 15.0 4.0 0.015 0.031 0.055

24LT310 3.1 6.0 24 100 2.5 16.0 5.0 0.018 0.030 0.055

24LT340 3.4 6.8 24 100 2.7 17.0 5.0 0.016 0.027 0.050

Items with S and SS at end of part number identify items with slit lead option. See Dimension Drawing and Part Ordering Number System sections of this document for more information.

= Hold current: maximum current device will pass without tripping in 20°C still air.

hold

= Trip current: minimum current at which the device will trip in 20°C still air.

trip

= Maximum voltage device can withstand without damage at rated current (I max)

max

= Maximum fault current device can withstand without damage at rated voltage (V

max

= Power dissipated from device when in the tripped state at 20°C still air.

= Minimum resistance of device in initial (un-soldered) state.

min

)

max

= Typical resistance of device in initial (un-soldered) state.

typ

= Maximum resistance of device at 20°C measured one hour after tripping or reﬂow

1max

soldering of 260°C for 20 sec.

Caution: Operation beyond the speciﬁed rating may result in damage and possible arcing and ﬂame.

Agency

Approvals

LT Series

Speciﬁcations are subject to change without notice. Please refer to www.littelfuse.com/series/LT.html for current information.

117

Revised: June 4, 2010

LT Series

Page 2

POLYFUSE® Resettable PTCs

Axial Lead Battery Strap Type > LT Series

Temperature Rerating

Ambient Operation Temperature

-40°C -20°C 0°C 20°C 40°C 50°C 60°C 70°C 85°C

Part Number Hold Current (A)

15LT070 1.20 1.09 0.85 0.70 0.50 0.45 0.35 0.28 0.16

15LT070S 1.20 1.09 0.85 0.70 0.50 0.45 0.35 0.28 0.16

24LT100 1.86 1.60 1.40 1.00 0.80 0.70 0.60 0.44 0.23

24LT100S 1.86 1.60 1.40 1.00 0.83 0.70 0.60 0.44 0.23

24LT100SS 1.86 1.60 1.40 1.00 0.83 0.70 0.60 0.44 0.23

24LT180 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36

24LT180S 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36

24LT180SS 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36

24LT190 3.32 2.86 2.40 1.90 1.48 1.25 1.10 0.79 0.43

24LT260 4.30 3.72 3.10 2.60 1.98 1.69 1.40 1.11 0.60

24LT300 5.10 4.40 3.70 3.00 2.30 1.95 1.60 1.25 0.69

24LT310 5.36 4.58 3.70 3.10 2.36 2.01 1.70 1.30 0.71

24LT340 5.52 4.79 4.00 3.40 2.60 2.24 1.90 1.51 0.78

Average Time Current Curves

1.80 A

0.70 A

1.00 A

1.90 A

2.60 A

3.00 A

3.10 A

3.40 A

Time in Seconds

0.1

0.01

1 10 100 1000

Current in Amperes

Temperature Rerating Curve

190%

170%

150%

130%

110 %

90%

70%

50%

Percentage of Rated Current

30%

10%

-40 -30 -20 -10 0 10 20 30 40 506070 80

Temperature (°C)

The average time current curves and Temperature Rerating curve performance is affected by a number or variables, and these curves provided as guidance only. Customer must verify the performance in their application.

LT Series

Revised: June 4, 2010

118

Please refer to www.littelfuse.com/series/LT.html for current information.

Speciﬁcations are subject to change without notice.

Page 3

POLYFUSE® Resettable PTCs

Axial Lead Battery Strap Type > LT Series

Physical Speciﬁcations

Terminal Material

Insulating Material Polyester tape

0.13mm nominal thickness, quarter-hard Nickel

Dimensions

Figure 1

D1 D2

Environmental Speciﬁcations

Operating/Storage Temperature

Maximum Device Surface Temperature in Tripped State

Passive Aging

Humidity Aging

Vibration

Figure 2

(Items with S at end of part number) (Items with SS at end of part number)

0.5 x 4.0

(.02”x .15”)

NOMINAL

SLIT

D1 D2

-40°C to +85°C

125°C

+70°C, 1000 hours

-/+10% typical resistance change

+85°C, 85%R.H.,7days,

-/+5% typical resistance change

MIL-LTD-883C, Condition A, No change

Figure 3

0.5 x 4.0

(.02”x .15”)

NOMINAL

SLIT

D1 D2

Part

Number

Inches mm Inches mm Inches mm in. mm in. mm Inches mm

Fig.

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Min. Min. Min Max. Min. Max.

15LT070 1 0.78 0.87 19.9 22.1 0.19 0.20 4.9 5.2 0.03 0.05 0.7 1.2 0.22 5.5 0.22 5.5 0.01 0.22 3.9 4.1

15LT070S 2 0.78 0.87 19.9 22.1 0.19 0.20 4.9 5.2 0.03 0.05 0.7 1.2 0.22 5.5 0.22 5.5 0.01 0.22 3.9 4.1

24LT100 1 0.82 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT100S 2 0.82 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT100SS 3 0.82 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT180 1 0.94 1.02 24 26 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT180S 2 0.94 1.02 24 26 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT180SS 3 0.94 1.02 24 26 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1

24LT190 1 0.84 0.92 21.3 23.4 0.40 0.43 10.2 11 0.02 0.04 0.5 1 0.20 5 0.20 5 0.01 0.20 4.8 5.4

24LT190S 2 0.84 0.92 21.3 23.4 0.40 0.43 10.2 11 0.02 0.04 0.5 1 0.20 5 0.20 5 0.01 0.20 4.8 5.4

24LT260 1 0.94 1.02 24 26 0.43 0.47 10.8 11.9 0.02 0.04 0.6 1 0.20 5 0.20 5 0.01 0.20 5.9 6.1

24LT300 1 1.12 1.25 28.4 31.8 0.51 0.53 13 13.5 0.02 0.04 0.5 1.1 0.25 6.3 0.25 6.3 0.00 0.25 6 6.6

24LT310 1 0.94 1.02 24 26 0.58 0.63 14.8 15.9 0.02 0.04 0.6 1 0.20 5 0.20 5 0.01 0.20 5.9 6.1

24LT340 1 0.94 1.02 24 26 0.58 0.63 14.8 15.9 0.02 0.04 0.6 1 0.20 5 0.20 5 0.01 0.20 5.9 6.1

Part Marking System

ABCD1D2E

Littelfuse Trademark

Top Side

190S

XX9R

Product Series

Current Rating

Lot Number (Contact Littelfuse for additional information)

LT Series

Speciﬁcations are subject to change without notice. Please refer to www.littelfuse.com/series/LT.html for current information.

119

Revised: June 4, 2010

LT Series

Page 4

Part Ordering Number System

24 LT 190 S U

QUANTITY CODE

U: 500 (bulk)

POLYFUSE® Resettable PTCs

Axial Lead Battery Strap Type > LT Series

LEAD OPTIONS:

HOLD CURRENT (VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS)

SERIES

Voltage Rating (VDC)

Packaging

Part Number

15LT070 15LT070U

15LT070S 15LT070SU

24LT100 24LT100U

24LT100S 24LT100SU

24LT100SS 24LT100SSU

24LT180 24LT180U

24LT180S 24LT180SU

24LT180SS 24LT180SSU

24LT190 24LT190U

24LT190S 24LT190SU

24LT260 24LT260U

24LT300 24LT300U

24LT310 24LT310U

24LT340 24LT340U

Ordering

Number

Blank = standard S = slit lead SS = both leads slit

hold

(A)

hold

Code

Packaging

Option

Quantity

Quantity &

Packaging Codes

0.7 070 Bulk 500 U

1.0 100 Bulk 500 U

1.8 180 Bulk 500 U

1.9 190 Bulk 500 U

2.6 260 Bulk 500 U

3.0 300 Bulk 500 U

3.1 310 Bulk 500 U

3.4 340 Bulk 500 U

LT Series

120

Revised: June 4, 2010

Please refer to www.littelfuse.com/series/LT.html for current information.

Speciﬁcations are subject to change without notice.