MICROSEMI LDTS30

LDTS14 thru LDTS48A
HEAVY DUTY (LOAD DUMP) TRANSIENT
VOLTAGE SUPPRESSOR
SCOTTSDALE DIVISION
APPEARANCE
This LDTS series is used in automotive and vehicular applications where
further protection may be required for load-dump and field-decay transients.
This type of protection is needed when the battery is disconnected while
the engine and alternator are still operating. This produces prolonged
severe transients requiring additional transient voltage suppressor design
considerations beyond those ratings specified for other conventional TVS
components.
TO-3
(TO-204AD)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES
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APPLICATIONS / BENEFITS
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Unidirectional TVS series for DC power applications
Low Clamping ratio
Working voltage (VWM) range of 14 volts to 48 volts
Hermetically sealed TO-3 package
Low thermal resistance
Dissipates heat from prolonged transients
Consult factory for other package options including
surface mount
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MAXIMUM RATINGS
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WWW . Microsemi .C OM
DESCRIPTION
LDTS 14 Series – Designed for a standard 12 volt
power system.
LDTS 24 Series – Designed for a standard 12 volt
power system capable of sustaining a 24 volt
(double voltage) jump start.
LDTS 30 Series – Designed for a standard 24 volt
power system.
LDTS 48 Series – Designed for a standard 24 volt
power system capable of sustaining a 48 volt
(double voltage) jump start.
MECHANICAL AND PACKAGING
3000 Watts of Peak Pulse Power dissipation at 50 ms
(see Figure 1)
tclamping (0 volts to V(BR) min.): Less than 100 pico
seconds (theoretical)
Storage temperature: -50oC to +200oC
Operating temperature: -50oC to 175oC (Figure 3)
Forward surge rating: 200 amps, 8.3ms at 25oC
Steady state power dissipation: 50 watts, TC = 25oC
Thermal resistance: Less than 1oC/W
Repetition Rate (duty cycle): 0.1%
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CASE: Industry standard TO-3 (TO-204AD)
hermetically sealed, .052 inch diameter pins.
FINISH: All external surfaces are corrosion
resistant and terminals solderable.
POLARITY: Standard polarity anode to case.
WEIGHT: 15 grams (approx.).
MOUNTING HARDWARE: Consult factory for
optional insulator and sheet metal screws
See package dimensions on last page
ELECTRICAL CHARACTERISTICS
Copyright  2003
11-12-03 REV A
MINIMUM
BREAKDOWN
VOLTAGE
V(BR)
@ 20mA
VOLTS
16.0
16.0
26.5
26.5
33.0
33.0
53.0
53.0
MAXIMUM
CLAMPING
VOLTAGE
@ IPP
VC
VOLTS
26.0
23.5
43.0
39.0
54.0
48.5
86.0
78.0
MAXIMUM
SURGE
CURRENT
(FIG. 2)
@ IPP
AMPS
115.5
128.0
70.0
77.0
56.0
62.0
34.0
38.0
MAXIMUM
REVERSE
CURRENT
@ VWM
ID
µA
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
MAXIMUM
VOLTAGE
TEMP.
VARIATION
VBR
mV/C
19.0
17.0
31.0
29.0
39.0
36.0
55.0
50.0
Page 1
LDTS14 thru LDTS48A
MICROSEMI
PART
NUMBER
LDTS 14
LDTS 14A
LDTS 24
LDTS 24A
LDTS 30
LDTS 30A
LDTS 48
LDTS 48A
REVERSE
STANDOFF
VOLTAGE
VWM
VOLTS
14.0
14.0
24.0
24.0
30.0
30.0
48.0
48.0
LDTS14 thru LDTS48A
HEAVY DUTY (LOAD DUMP) TRANSIENT
VOLTAGE SUPPRESSOR
SCOTTSDALE DIVISION
FIGURE 1
Peak Pulse Power vs. Pulse Time @ 25oC
WWW . Microsemi .C OM
GRAPHS AND TEST CIRCUIT
FIGURE 2
Surge Waveform
Percent of Rated Power
PACKAGE DIMENSIONS
LDTS14 thru LDTS48A
TC – Case Temperature – o C
FIGURE 3
Derating Curve
FIGURE 4
Copyright  2003
11-12-03 REV A
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2