SPECIFICATION FOR APPROVAL

SPECIFICATION

NO.

PART NO.

53D951K

PAGE 1 OF 2

DATE: 2023年9月5日

UL

CSA

1.OUTLINE

1.1

APPEARANCE

WITHOUT ANY CRACK, MARKING SHOULD BE CLEAR

1.2

DIMENSIONS

DIMENSIONS (mm)

D (Max)

60

H (Max)

78.0

T (Max)

10.9

W (±0.05)

9.7

t

0.7

E (±1.0)

25.4

Φ (M4)

4.3

2.ELETRICAL PARAMETER

2.1

MAX ALLOWABLE VOLTAGE

AC: 580(V)

At 1mA DC

DC: 750(V)

2.2

VARISTOR VOLTAGE

855~1045(V)

V0.1mA □ V1mA ■

2.3

MAX CLAMPING VOLTAGE

IP: 500(A)

Test Current Waveform 8/20μs

Vc: 1500(V)

2.4

WITHSTANDING SURGE CURRENT

In: 50000(A)

Test Current Waveform 8/20μs

IMax: 70000(A)

2.5

MAX ENERGY

1548(J)

Test Current Waveform 10/1000μs

2.6

TYPICAL CAPACITANCE

3100(pf)

@1KHz

2.7

LEAKAGE CURRENT

≦ 30(μA)

At 80% of Varistor Voltage

2.8

NONLINEAR EXPONENT (α)

≧ 21

α=log

I1

log

V1

I2

V2

2.9

TEMPERATURE COEFFICENT OF VARISTOR VOLTAGE

≦±0.05%/℃ max

Vc85℃-Vc25℃ × 1 ×100(％℃) Vcat25℃ 60

2.10

IMPULSE LIFE

≦±10%(V1mA)

Test Current Waveform 8/20μs

SPECIFICATION FOR APPROVAL

Strong Surge Withstand Capacity 53D MOV Metal Oxide Varistor Wide Working Voltage Range

SPD varistor manufacturers believe that semiconductor devices are also one of the new components introduced into automobiles, mainly used to protect the electrical system of automobiles and avoid damage to the system by overvoltage and surge energy. The application of varistors in automobiles can avoid the use of various techniques to adjust the electrical system. The low-voltage high-energy zinc oxide varistor (MYN1) is directly used to adjust the voltage and current of the ab terminal of the power supply to protect the entire electrical system. Even if the battery is disconnected from the power supply or the load drops sharply, and there is a large surge energy at both ends of AB, the varistor can also protect semiconductor devices and various electronic devices from surge impact, thereby reducing the volume and weight of the vehicle, and reducing driving fuel consumption. 

The application of varistors in automobiles can not only protect automobiles, but also improve automobile manufacturing technology and performance. SPD varistor manufacturers believe that rheostats can also protect the voltage and suppress the overvoltage of electronic ignition. When the ignition system is in normal working condition, the ignition ring will generate counter electromotive force. If the voltage across the secondary L2 calculated by the turns ratio exceeds 20kV, the high voltage will cause instantaneous breakdown of the spark plug, and the ignition will start normally. However, if the ignition system fails and the ignition is not normal, the induced voltage will cause a high overvoltage at the primary end of the ignition system, thereby shortening the life. By applying varistors and directly connecting varistors at both ends of the composite tube, it is possible to protect the ignition system, suppress overvoltage, and protect the automotive electrical system.
 

Basic properties of varistors:
 

(1) Protection characteristics. When the impact strength of the impact source (or the impact current Isp=Usp/Zs) does not exceed the specified value, the limited voltage of the varistor is not allowed to exceed the impact withstand voltage (Urp) that the protected object can withstand. .
(2) Impact resistance characteristics, that is, the varistor itself should be able to withstand the specified impact current, impact energy, and the average power when multiple impacts occur one after another.
(3) There are two life characteristics. One is the continuous working voltage life, that is, the varistor can meet the specified working time (hours) under the specified ambient temperature and system voltage conditions. The second is the impact life, that is, the number of times it can reliably withstand the specified impact.

Production Process / Quality Control​

Application

1. Varistor voltage: refers to the voltage value across the varistor at a specified temperature and DC (generally 1mA or 0.1mA). Recorded as V1mA or V0.1mAo
2. Maximum continuous voltage: refers to the maximum effective value of sinusoidal AC voltage or the maximum DC voltage value that can be continuously applied to both ends of the varistor for a long time under the specified ambient temperature
3. Limiting voltage: refers to the maximum peak voltage at both ends of the varistor when a specified surge current (8,20μs) passes through it.
4. Rated power: refers to the maximum average impact power that can be applied to the varistor under the specified ambient temperature.
5. Maximum energy: the maximum impact energy that can be applied to the varistor under the condition that the varistor voltage does not change more than ±10% and the impulse current waveform is 10, 1000μs or 2ms.
6. Current capacity (maximum inrush current)