Metal Oxide Varistors
Definitions
Features
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Our Metal Oxide Varistors have UL, CSA, SEV and VDE approvals. Plus specific types comply with Accelerated Aging Test Requirements per ANSI/IEEE C62.11. The factory is ISO and TS16949 certified. Taped Parts conform to EIA standards. All electrical specifications are to industry standards with definitions conforming to IEEE specifications. Solderability to MIL STD. Epoxy flammability rating of 94V0.
- RoHS Compliance - Metal Oxide Varistors utilizing suffix (-N) denoting RoHS compliant types for disk sizes 05, 07, 10, 14, 18, 20, 25, 32, 34, 40, and 53 purchased from World Products Inc. comply with RoHS Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. Our metal oxide varistors contain a maximum concentration value of 0.1% by weight in homogeneous materials for lead, mercury, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) and of 0.01% weight in homogeneous materials for cadmium. See Part Number System for more details.
- Product consistency is maintained through extremely stringent quality and statistical control. On-line automatic test equipment provides 100% inspection.
- Extensive selection of equivalents to essentially all metal oxide varistor types. All specifications available for proper accurate design-in purposes.
- Extremely low leakage current levels achieved and exceptional surge handling capability through proprietary formulations.
- Epoxy conformity and control providing for consistent physical dimensions and improved solderability.
- Varistor product design flexibility and quick design cycles in order to assist our customers with their most stringent varistor applications.
Definition of Terms
Average Power Dissipation: Tested using two consecutive pulses at rated peak current using a 10/1000µs test waveform with a minimum pulse period of 60 seconds between pulses (IEC 61000-4-5).
Rated RMS Voltage, Rated DC Voltage: The maximum designated values of power system voltage that may be applied continuously between the terminals of a device.
Varistor Voltage: Test characteristic that is used to classify varistors by type. A test current of 1mA DC is typically used to determine varistor voltage classification type. Varistor voltage clamping characteristics can be defined at various test levels.
Rated Peak Single Pulse Transient Current: Maximum surge current, 8/20µs waveform which a varistor is rated to withstand for a single surge.
Rated Single Pulse Transient Energy: Maximum allowable energy for a single impulse (see specified waveforms).
Maximum Clamping Voltage: Measured peak voltage across the device terminals when a current impulse of specified amplitude and waveform is conducted through the varistor.
Typical Capacitance: Typical capacitance values are measured at a test frequency of 1KHZ.
General Characteristics
| Storage Temperature |
- 55° C to + 125° C |
| Operating Surface Temperature |
125° C |
| Operating Ambient Temperature |
- 55° C to + 85° C (without derating) |
| Maximum Voltage-Temperature Coefficient |
< -0.01 % / °C |
| Insulation Resistance |
1000 Megohm min. |
| Hi POT (Leads to Case, 1 min.) |
2500 VDC (Phenolic coating 500 VDC and 2000 VDC ratings) |
| Typical Response Time |
< 15 nsec. |
| Epoxy Rating |
94 V-0 |
| Current/Energy Derating (>85°C) |
- 2.5 % / °C |
| DC Leakage Current |
200µA Max (at rated DC working voltage) |
| Solderability |
MIL STD 202G, Method 208H |
| Failure Criteria |
Voltage change ± 10% from initially measured Varistor Voltage. When determining if varistor is within aforementioned criteria the same temperature must be observed as was used for initial Varistor Voltage measurements. |
Power Dissipation Ratings
| Disc Size |
Pm-watts |
|
Disc Size |
Pm-watts |
| 5mm ( < 50 VAC ) |
0.01 |
20mm ( < 50 VAC ) |
0.20 |
| 5mm ( ≥ 50 VAC ) |
0.20 |
20mm ( ≥ 50 VAC ) |
1.00 |
| 7mm ( < 50 VAC ) |
0.02 |
25mm |
1.20 |
| 7mm ( ≥ 50 VAC ) |
0.25 |
32mm |
1.60 |
| 10mm ( < 50 VAC ) |
0.05 |
34mm (Single) |
2.10 |
| 10mm ( ≥ 50 VAC ) |
0.40 |
34mm (Dual) |
2.73 |
| 14mm ( < 50 VAC ) |
0.10 |
40mm |
2.10 |
| 14mm ( ≥ 50 VAC ) |
0.60 |
53mm |
2.50 |
| 18mm ( ≥ 50 VAC ) |
0.80 |
60mm |
2.80 |
Part Marking
| Example: 20E241K-VB |
| 20 |
E |
241 |
K |
– |
V |
B |
| –– |
–– |
–– |
–– |
|
–– |
–– |
| (1) |
(2) |
(3) |
(4) |
|
(5) |
(6) |
|
(1) Disc Diameter
5 = 5mm, 7 = 7mm, 10 = 10mm, 14 = 14mm,
18 = 18mm, 20 = 20mm, 25 = 25mm, 32 = 32mm,
34 = 34mm, 40 = 40mm, 53 = 53mm, 60 = 60mm
(2) Type
D = Standard
E = High Energy
R = (applicable only for 34mm Types)
(3) Varistor Voltage
241 = 24 x 101 = 240 (DC Volts)
(4) Tolerance
J = 5%, K = 10%, M = 20%
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(5) V = Extremely High Energy Rating
(6) B = Phenolic coating rated at 500 VDC. Phenolic coating rated at 2000 VDC requires no marking.
Date Code
528 = First digit represents year – 5 = 2005. Second and third digits represent the week of the year. This new date code system was implemented from 9/15/05.
* - Parts will be marked Sincera. (This is the brand name.)
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Part Number System
| Example: VZ20D241KBOCX-VPN |
|
|
|
|
| V |
Z |
20 |
E |
241 |
K |
B |
O |
C |
X |
- |
V |
P |
N |
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
|
(11) |
(12) |
(13) |
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(1) Series
V = Varistor
(2) Type
Z = Zinc Oxide
(3) Disc Diameter
05 = 5mm, 07 = 7mm, 10 = 10mm, 14 = 14mm,
18 = 18mm, 20 = 20mm, 25 = 25mm, 32 = 32mm,
34 = 34mm, 40 = 40mm, 53 = 53mm, 60 = 60mm
(4) Type
D = Standard
E = High Energy Type
R = (applicable only for 34mm Types)
(5) Varistor Voltage
241 = 24 x 101 = 240 (DC Volts)
(6) Tolerance
J = 5%, K = 10%, M = 20%
(7) Packing Code
B = Bulk Pack
(For taped parts packing code,
see Taping Specifications.)
Note: For sizes 32 and larger please reference specification pages for fields beyond (6).
(8) Lead Configuration (For Bulk Parts)
S = Straight
O = Outward Crimp
I = Inward Crimp
L = Inline Crimp
N = Bulk parts for 320VAC and larger come standard with inline crimp (see illustration below) for straight disc seating on PC boards. If straight leads are required instead of inline crimp please use code “N” in the appropriate position as stated above.
Note: Also applicable for 32mm (KW Series) with wire leads.
R = Bare disk without leads (no epoxy).
Available in 20mm and 25mm disk sizes** (RoHS Compliant).
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(9) Lead Cutting
A = 4.0 ± 1.0mm (.16" ± .04")
(Crimped lead)
B = 3.0 ± 1.0mm (.12" ± .04")
(Crimped lead)
C = 4.5 ± 1.5mm (.18" ± .06")
(Crimped lead)
D = 6.5 ± 1.0mm (.26" ± .04")
(Crimped lead)
E = 4.0 ± 1.0mm (.18" ± .04")
(Straight lead)
F = 5.0 ± 1.0mm (.2" ± .04")
(Crimped lead)
G = 3.3 ± 0.5mm (.13" ± .02")
(Crimped lead)
(For lead length reference points see
Standard Lead Modifications).
Note: Also applicable for 32mm (KW Series) with wire leads.
(10) Lead Spacing
X = 10mm (0.4”) lead spacing (1mm (0.039”) lead diameter).
(For 18mm and 20mm disc diameter only.)
Z = 5mm (0.2") leadspacing.
(For 10mm and 14mm disc diameters.)
(11) Extremely High Energy Rating
V = 15KA for 20mm and 12KA for 18mm, “E Series” parts only. Available in varistor voltages 201, 221, 241 and 511 (UL1414, UL1449 and UL497B recognized parts). CSA recognized for 14, 18 & 20mm “E Series” parts all values ≥ 201 with the exception of 14E (911, 102 & 112). 14E “V” series parts are rated at 7.5KA. (If you have a special voltage request, please inquire).
(12) Coating Option
P = Non-Flammable Phenolic Coating. Applicable for UL1414 (5mm – 20mm), UL1449 (5mm – 20mm), and CSA (5mm – 20mm) recognized parts.
Note: Applicable for disk sizes 5mm – 20mm.
Y = Bare disk with leads (no Epoxy).
Available in 20mm and 25mm disk size** (RoHS Compliant).
(13) RoHS Compliant*
N = RoHS Compliant
(Available in disk sizes 5mm – 53mm)
UL1414 (5mm – 32mm,40mm and 53mm) CSA (5mm – 53mm).
UL1449 (5mm – 53mm) UL497B (5mm – 20mm).
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** 32mm – 53mm types are also available as bare disk with and without leads. Reference suffix codes stated in Electrical/Dimensions section for these types in this catalog.
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