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 • • • • • • • APPLICATIONS / BENEFITS • 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 • • • MAXIMUM RATINGS • • • • • • • • 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% • • • • • • 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