MAX. CLAMPING VOLTAGE. VA VDC Vc (V) Ip (A) Crms DNR5D DNR5D
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1 Millennium Components Corp. 6F-3, 169, Yang Ming Road, Kaohsiung Taiwan, R.O.C. Tel: Fax : DNR VARISTORS Description DON s DNRs are ZINC OXIDE non-linear resistors whose resistance changes as a function of the applied voltage. The DNR provides a highly reliable and economic way to protect against repeated high voltage transient and surges such as those produced by induced lightning surges, switching surges and noise spike. The DNR utilizes a ceramic element composed of Zinc Oxide and several kinds of metal oxide additives that have been sintered at relatively highly temperature. Ohmic electrodes are connected to each end of element by firing. FEATURES: Broad products range Varistor Voltage : 18 V to 1.8 KV Fast response to the rapidly rising surge voltage (m Sec.) Excellent non-linearity voltage Symmetric V-1 characteristics Great withstanding surge current No follow-on current Long Life SPECIFICATIONS MODEL NO. VARISTOR VOLTAGE (v) MIN MAX MAX. CONTINUOUS VOLTAGE MAX. CLAMPING VOLTAGE VA VDC Vc (V) Ip (A) Crms PEAK MAX. TYPICAL ALLOWABLE CURRENT ENERGY CAPACITANCE POWER (a) (J) (Referance) (W) 8/20 2m 1 KHz (PF) Sec.x2 DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D
2 DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR5D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR7D DNR10D DNR10D DNR10D DNR10D DNR10D
3 DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR10D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D
4 DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR1D DNR14D DNR14D DNR14D DNR14D DNR1D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR14D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D
5 DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D DNR20D temperature : Storage temperature : VARISTOR VOLTAGES are measured at 0.1 ma for 5D Series, and at 1 ma for 7D, 10D, 14D and 20D Series. Non-Standard Specifications are available. APPLICATIONS : Transistor, Diode, IC, Thyristor and Triac semiconductor. Surge protection in consumer electronics. Surge protection in industrial electronics. Surge protection in communication, measuring and controller electronics. Surge protection in electronic home appliances, gas and petroleum appliances. Electrostatic discharges and noise spike suppression. Relay and electromagnetic valve surge absorption.
6 CHARACTERISTICS DNR has the forward-reverse symmetrical electrical characteristics shown in the Fig 1. The curve is plotted for a wider range of current than that normally given in data sheet to show three regions in Fig 2. *Pre breakdown region *Normal operating region *Upturn region 2-2 Voltage temperature coefficient The voltage temperature coefficient (TC) is generally calculated by measuring VIcm A at 20 C and V2cmA at 70 C. 2-3 Power derating 2-4 Surge test wave form according to IEC60 2, section 6.
7 Precaution for Handing 1. Line protection Line to Line protection Line to Line to Ground protection Connections DC AC Single phase Ac three phase DC AC Single phase AC three phase Line to Line DNR Line voltahe Part number Line to Ground DNR Line voltage Part number Application examples Selection of ratings Varistor voltage Notes: DNR 1 DNR 3 AC 110V AC 220V DC 12V DC 24V AC 220V 201K 221K DNR- 241K 271K* 391K DNR- 431K 471K DNR- 220K DNR- 390K 391K DNR- 431K 471K* Notes: DNR 2 DNR 4 AC 110/220V AC 220V DNR- 431K 471K 1) when the 500V insulation resistance test of the circuits DNR- 431K 471K employing NDR is conducted, DNR should be removed after getting approval from the custom, or DNR** with the maximum allowable voltage exceeding to test voltage should be used. 1) Maximum operating voltage should be lower than maximum allowable voltage of DNR at all times. 2) DNRs with are recommended for AC 110 and 220 applications to withstand a temporary over voltage caused by LC resonation in capacitive load. 2) When the 1000V withstanding voltage test is conducted, DNR should be removed after getting approval from the customer according to the relevant regulations, or DNR***with the maximum allowable voltage exceeding to the test voltage should be used. 3) To avoid DNR failure caused by the ground fault, DNR with higher varistor voltage listed in the table should be used for the AC 110V line to ground application
8 Application examples Protected circuit Location Part number Notes for selection 1) The special using conditions of the Application examples Selection for ratings WITHSTANDING SURGE CURRENT Home application Communications Measurements Controls Indoor Outdoor Indoor Outdoor 05 DNR-07D K DNR-10D K 2) Lightning arrester box are available for 14 DNR-10D K 10 DNR-14D K individual protected circuit should be taken into account to DNR selection in addition to the general selection procedure. heavy duty operations. 20 Consumer Industrial Indoor Outdoor 14 DNR- D K A surge excess of the specified withstanding surge current may cause short circuits or mechanical breakdown. The following counter measures re recommended. Precaution for handling 1) Location of the over current protector (circuit breaker and current fuse) should be in the power line to the circuit (Location A) or in series with DNR (Location B). Part number DNR+05D DNR+07D DNR+10D DNR-14D DNR-20D Fuse rating 1 to 2A 2 to 3A 3 to 5A 3 to 10A 5 to 10A 2) It is recommended that a fuse listed in the table be put in location A or B. 3) In case that DNR is used in line to ground, the ground fault circuit interrupter should be applied in location A or thermally coupled fuse should be applied in location B. 4) DNR should not be used near the flamable materials. 2. When DNR is molded at end-user, molding resin materials should be carefully selected, otherwise DNR s long term stability could degradate. 3. DNR should not be used near heat generating devise and free from direct sunlight. DNR should be used within the specified operating temperature range. 4. DNR should be free from dust, metal power, dew and sea wind. A protective box is recommended to prevent the unit from those.
9 2. Switching surge protection, semiconductor protection and contact spark suppression. Switching surge protection Semiconductor protection Contact spark suppression Precaution General application for handing Circuit General selection examples Notes for selection Varistor voltage Selection example Voltage DC 12V DC 24V DC 100V AC 110V Varistor voltage 1) The maximum allowable voltage of DNR DNR- should be higher than maximum operating DNR- voltage at all times. DNR- 2) Energy handling capability (energy or wattage 201K rating) of DNR should be selected by studying 221K switching surge energy from the inductive load. DNR- 1) Refer to the mentioned precautions described in power line protection. 2) Capacitor connection in parallel with DNR is recommended for a contact spark suppression. 3. Signal line protection Signal line protection General application Circuit Selection example General selection examples Notes for selection Signal voltage Varistor voltage 1) DNR has relatively high capacitance listed in the table. Varistor voltage DC 12V Max. DC 24V DNR- DNR- DNR- 2) Special attention should be paid for it in high frequency circuits. When high voltage such as the ringer voltage in telephone signal line is overlaid on signal voltage, DNR- varistor voltage of DNR should be selected based upon DNR- above higher voltage. 3) When DNR s insertion loss in high frequency circuits handling Precaution for Refer to the mentioned precautions described in power line protection. is vary critical, DNR with * is recommended.
10 ORDERING SYSTEM DNR D K - Lead form: S =Straight lead K =Kinked lead Packing: R =Reel packing B =Bulk packing Tolerance: J = 5% K= 10% M= 20% Voltage of VARISTOR VcmA Series No. Element diameter Symbol of DON S VARISTORS
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