Harris DA Series, DB Series Ratings & Specifications

DA/DB Series Ratings & Specifications

Maximum Rating (85ºC) Specifications (25ºC)

Continuous Transient

Part Number

Device Branding

V

RMS

V

M(AC)

V

V

M(DC)

Energy

DC

(2ms)

WTM I

Peak

Current

8 x 20μs

Min

TM

Varistor Voltage at 1mA

DC Test Current

V

NOM

Max

V

C

DA DB (V) (V) (J) (A) (V) (V) (V) (A) (pF)

V131DA40 V131DB40 130 175 270 40000

V151DA40 V151DB40 150 200 300 40000

1

184 200 228 345 10000

2

212 240 268 405 8000

V251DA40 V251DB40 250 330 370 40000 354 390 429 650 5000

V271DA40 V271DB40 275 369 400 40000 389 430 473 730 4500

V321DA40 V321DB40 320 420 460 40000 462 510 561 830 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.

Maximum

Clamping

Volt V

at

C

200A Current

tance f =

(8/20μs)

IPK C

Typical

Capaci-

1MHz

Power Dissipation Ratings

100

90

80

70

60

50

40

30

PERCENT OF RATED VALUE

20

10

0

Figure 1

NOTES:

1. Peak current Applies to applications rated up to 115VRMS. Peak
current is 30kA for applications greater than 115V.

2. Peak current applies to applications rated up to 132VRMS. Peak
Current is 30kA for applications greater than 132V.

-55 50 60 70 80 90 100 110 120 130 140 15

AMBIENT TEMPERATURE (oC)

Should transients occur in rapid succession, 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 derated at high
temperatures as shown above. 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.

Peak Pulse Current Test Waveform

100

90

50

PERCENT OF PEAK VALUE

10

O

1

Figure 2

01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example - For an 8/20 μs Current Waveform:

8μs = T1 = Rise Time
20μs = T2 = Decay Time

T

T

1

T

2

TIME

DA/DB Varistor Series

146

Revision: January 9, 2009

©2008 Littelfuse, Inc.

Please refer to www.littelfuse.com/series/da or /db.html for current information.

Specifications are subject to change without notice.

Maximum Clamping Voltage

V131DA40 - V751DA40 and V131DB40 - V751DB40

6,000

MAXIMUM CLAMPING VOLTAGE

5,000

DISC SIZE 40mm

MAXIMUM PEAK VOLTS (V)

Figure 3

4,000

130 TO 750 VM(AC) RATING

3,000

V511DA/DB40

V481DA/DB40

2,000

V421DA/DB40

1,000

900
800
700
600

500
400

V151DA/DB40

300

V131DA/DB40

200

-210-1100

10

PEAK AMPERES (A)

10110

V751DA/DB40

V661DA/DB40

V571DA/DB40

2

TA = -55oC to 85oC

V321DA/DB40

V271DA/DB40

V251DA/DB40

10310410

Repetitive Surge Capability

V131DA40 - V751DA40 and V131DB40 - V751DB40

50,000

20,000

10,000

SURGE CURRENT (A)

5

Figure 4

1

5,000

2

10

2,000

3

10

1,000

500

200

100

50

INDEFINITE

20

10

20 100 1,000 10,000

2

10

IMPULSE DURATION (μs)

DISC SIZE 40mm
V131DA40 - V751DA40
V131DB40 - V751DB40

4

10

5

10

6

10

NOTE: If pulse ratings are exceeded, a shift of V
+/-10% could result. This type of shift, which normally results in a decrease of V
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.

(at specified current) of more than

N(DC)

N(DC)

Physical Specifications

Lead Material

Insulating Material

Device Labeling

DA - Copper, Tin–plated
DB - Brass, Tin–plated

Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.

Marked with LF, part number and date
code

, may

Environmental Specifications

Operating/Storage
Temperature

Humidity Aging

Thermal Shock

Solvent Resistance MIL–STD–202, Method 215F

Moisture Sensitivity Level 1, J–STD–020C

-55°C to +85°C/ -55°C to
+125°C

+85°C, 85% RH, 1000 hours
+/- 5% typical resistance
change

+85°C to -40°C 10 times
+/- 5% typical resistance
change

©2008 Littelfuse, Inc.

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

147

Revision: January 9, 2009

HI–ENERGY MOV’S DA/DB Series

DA/DB Varistor Series