Copyright © Harris Corporation 1995
4-51
SEMICONDUCTOR
DA/DB Series
Industrial High Energy Metal-Oxide Varistors
March 1995
Features
• Recognized as “Transient Voltage Surge Suppressors”, UL File
#E75961 to Std. 1449
• High Energy Absorption Capability WTM . . . . . . . . . . . . Up To 1050J
• Wide Operating Voltage Range VM(AC)RMS . . . . . . . . . . . 130V to 750V
• Rigid Terminals for Secure Wire Contact (DA Series)
• Case Design Provides Complete Electrical Isolation of Disc
Subassembly
• Large Diameter Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mm
DA SERIES DB SERIES
Description
DA and DB series transient surge suppressors are heavy-
duty industrial metal-oxide varistors designed to provide
surge protection for motor controls and power supplies used
in oil-drilling, mining, and transportation equipment. Possible
voltage surges in their AC power supplies could cause
product failure and the subsequent faulty operation of these
systems.
These UL-recognized varistors have identical ratings and
specifications but differ in case construction to provide flexi-
bility in equipment designs.
DA series devices feature rigid terminals to insure secure
wire contacts. Both the DA and DB series feature improved
creep and strike distance capability to minimize breakdown
along the package surface design that provides complete
electrical isolation of the disc subassembly.
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
DA/DB SERIES UNITS
Continuous:
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 750
175 to 970 V
V
Transient:
Peak Pulse Current (ITM)
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Pulse Energy Range
For 10/1000µs Current Wave (WTM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30,000 to 40,000
270 to 1050
A
J
Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +85 oC
Storage Temperature Range (TSTG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125 oC
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . <0.01 %/oC
Hi-Pot Encapsulation (Isolation Voltage Capability) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) 5000 V
Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 MΩ
File Number 2189.3
4-52
Specifications DA/DB Series
Device Ratings and Specifications
Series DA and DB Varistors are listed under UL file #E75961 as a UL recognized component.
MODEL NUMBER
MAXIMUM RATINGS (+85oC) SPECIFICATIONS (+25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLTAGE
AT 1mA DC TEST
CURRENT
MAX
CLAMPING
VOLT VC
AT 200A
CURRENT
(8/20µs)
TYPICAL
CAPACI-
TANCEVRMS VDC
ENERGY
(2ms)
PEAK
CURRENT
(8/20µs)
VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VCf = 1MHz
DA DB (V) (V) (J) (A) (V) (V) (V) (V) (pF)
V131DA40 V131DB40 130 175 270 30000 184 200 228 345 10000
V151DA40 V151DB40 150 200 300 30000 212 240 268 405 8000
V251DA40 V251DB40 250 330 370 30000 354 390 429 650 5000
V271DA40 V271DB40 275 369 400 30000 389 430 473 730 4500
V321DA40 V321DB40 320 420 460 30000 462 510 539 830 3800
V421DA40 V421DB40 420 560 600 40000 610 680 748 1130 3000
V481DA40 V481DB40 480 640 650 40000 670 750 825 1240 2700
V511DA40 V511DB40 510 675 700 40000 735 820 910 1350 2500
V571DA40 V571DB40 575 730 770 40000 805 910 1000 1480 2200
V661DA40 V661DB40 660 850 900 40000 940 1050 1160 1720 2000
V751DA40 V751DB40 750 970 1050 40000 1080 1200 1320 2000 1800
NOTE: Average power dissipation of transients not to exceed 2.0W.
Power Dissipation Ratings
Continuous power dissipation capability is not an applicable
design requirement for a suppressor, unless transients occur
in rapid succession. Under this condition, the average power
dissipation required is simply the energy (watt-seconds) per
pulse times the number of pulses per second. The power so
developed must be within the specifications shown on the
Device Ratings and Specifications table for the specific
device. Furthermore, the operating values need to be der-
ated at high temperatures as shown in Figure 1. Because
varistors can only dissipate a relatively small amount of
average power they are, therefore, not suitable for repetitive
applications that involve substantial amounts of average
power dissipation. FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
AMBIENT TEMPERATURE (oC)
PERCENT OF RATED VALUE
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O1T
T1T2
TIME
PERCENT OF PEAK VALUE
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front Time = 1.25 •t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T1 = Virtual Front Time
20µs = T2 = Virtual Time to Half Value
4-53
DA/DB Series
Transient V-I Characteristics Curves
FIGURE 3. CLAMPING VOLTAGE FOR V131DA40, V131DB40 - V751DA40, V751DB40
Pulse Rating Curves
FIGURE 4. SURGE CURRENT RATING CURVES FOR
V131DA40, V131DB40 - V321DA40, V321DB40 FIGURE 5. SURGE CURRENT RATING CURVES FOR
V421DA40, V421DB40 - V751DA40
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than±10% could result. This type of shift, which normally
results in a decrease of VN(DC), may result in the device not meeting the original published specifications, but it does not prevent the device
from continuing to function, and to provide ample protection.
200
6,000
5,000
4,000
3,000
1,000
900
800
700
600
500
400
300
10-2 10-1 100 101 102 103 104 105
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 40mm
130 TO 750 VM(AC) RATING
TA = -55oC to +85oC
V421DA/DB40
V151DA/DB40
V751DA/DB40
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES (A)
V131DA/DB40
V321DA/DB40
V271DA/DB40
V251DA/DB40
V511DA/DB40
V481DA/DB40 V571DA/DB40
V661DA/DB40
2,000
DISC SIZE 40mm
V131DA40 - V321DA40
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
1020 100 1,000 10,000
SURGE CURRENT (A)
IMPULSE DURATION (µs)
2
1
INDEFINITE
104
103
102
V131DB40 - V321DB40
105
106
10 DISC SIZE 40mm
V421DA40 - V751DA40
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
1020 100 1,000 10,000
SURGE CURRENT (A)
IMPULSE DURATION (µs)
V421DB40 - V751DB40
2
1
INDEFINITE
104
103
102105
106
10
4-54
DA/DB Series
Package Outline Dimensions
DA SERIES
Dimensions in millimeters and (inches).
A
4.3mm
(0.170) 15mm (0.59)
“A” DIMENSION:
FILISTER HEAD SCREW - 51mm (2.01)
PAN HEAD SCREW - 53mm (2.09)
23mm ± 1mm
(0.90 ±0.04)
57mm
(2.24)
67mm
(2.64)
62mm
(2.44)
M4 INTERNATIONAL
THREAD
4.5mm (0.18)
DB SERIES
60.3
(2.37)
44.45 ±0.75
(1.75 ±0.03)
46.8
(1.84) 25.4 ±0.75
(1.00 ±0.03)
ALL DIMENSIONS ARE MAXIMUM
EXCEPT WHERE NOTED
HOLES 0.21 THRU
BORE 0.343 x 0.328 DP 12.7
(0.50)
6.35
(0.25)
2 HOLES
6.35
(0.25)
41
(1.61)
40.5
(1.6)
1.6
(0.06)
23
(0.90)
12.7
(0.50)
