VDR 07D471K Voltage Dependent Resistor , 470V Surge Voltage Suppressor

Voltage Dependent Resistor VDR 07D471K As Surge Voltage Suppressor or Surge Absorber

Description Of The Voltage Dependent Resistor VDR 07D471K

Varistors can be used as suppressors to protect devices and circuits from transient abnormal voltages including an ESD (electrostatic discharge) and a lightning surge.
For protection from a relatively large surge current (100A to 25kA), leaded disk varistors and SMD disk varistors are suitable. For protection from a larger surge current (approximately 25kA or more), block varistors, and strap varistors are suitable.

For industrial devices and energy apparatuses, disk varistors of which maximum allowable circuit voltage (rated voltage) and maximum peak current are large are used.
●Leaded disk varistors
●ThermoFuse varistors
●SMD disk varistors
●Strap varistors
●Block varistors

Features Of The Voltage Dependent Resistor VDR 07D471K

* Wide operating temperature -40~+125C

* Available in tape and reel packaging for automatic pick-and-place

* Certificated by CQC UL TUV

* Surface mount devices 

* Fully automatic production line

Applciation Of The Voltage Dependent Resistor VDR 07D471K

Over-voltage and transient voltage protection:

• Data lines and I/O port protection

• Protection against ESD transients

• On-board protection of IC’s and transistors

• Modem protection

• LCD protection

● Sample application: Surge protection for the input part of a switching power supply
● Sample application: Surge protection for a LED lighting system
● Sample application: Surge protection for inductive loads such as motors
● Sample application: Surge protection for a motor with an electromagnetic brake and protection for the contact of its switch
● Sample application: Surge protection for an SSR (solid-state relay) and protection for its output terminal
● Sample application: Surge protection against load dump and field decay
● Sample application: Surge protection for joint boxes and power conditioners of solar power generation systems
● Sample application: Surge protection for important devices using a lightning transformer
● Sample application: Protection against a high-energy surge in industrial devices

Agency Approvals Of The Voltage Dependent Resistor VDR 07D471K

Dimensions, Appearance Identification Of The Voltage Dependent Resistor VDR 07D471K(mm)

Highly Recommended:
1. In the drawing board, it is recommended that the A solder joint be used as the L line, the B solder joint

as the N line, and the copper skin connected to the B solder joint is routed around the pressure-sensitive

chip circle (the entire diameter D should be regarded as belonging to the A solder joint.

2. For the sake of safety arcing, the circular edge of the chip should be at least 2.5mm away from any other

conductive device, as shown in the figure above (in order to prevent mutual displacement with other devices

during patching, if the space allows, please reserve the larger the interval is. Okay.)
3. The use of varistors in DC circuits has unfavorable factors. It is not recommended to use varistors in

rectified DC circuits. Please consider carefully or contact our company at 18128566098 (sales1@ampfort.net),

thank you!

Electrical Performance Of The Voltage Dependent Resistor VDR 07D471K

For different voltage application environments, we recommend the following pressure sensitive

combinations to provide overvoltage, surge and lightning stroke protection for ACLED. 

Since pressure sensitive resistor is easy to degrade under the environment with strong voltage fluctuation,

it is required to select the combination with high pressure sensitive voltage value as much as possible

under the premise that withstand voltage of IC (MOS tube) +lamp bead on lamp board is pretty high

and that voltage has a large fluctuation area; besides, it is necessary to select pressure sensitive
resistor with large circulation and volume as far as possible, without exceeding cost limit.

Curve diagram of wave soldering Of The Voltage Dependent Resistor VDR 07D471K

The picture above shows the approximate trend of the reflow oven temperature curve on the market. Our

SMD pressure sensor uses the silver electrode of the ceramic body as one of the welding electrodes.

Please pay attention to setting the oven temperature and time (if the highest temperature is 260°C,

please Note that the time is 3-8S, if it exceeds 30S, the protection effect of the varistor will be affected). 

Package Of The Voltage Dependent Resistor VDR 07D471K

Precautions

1. The cumulative error of any 10 consecutive ratchet holes does not exceed ±0.2mm;
2. The non-parallel distance of 250mm in the length direction of the carrier tape shall not exceed 1mm;
3. The uninjected R angle is 0.2-0.3, and the uninjected demoulding slope is 5°;
4. Comply with EIA-481-D specification and ROHS requirements;
5. Thickness: 0.30±0.05mm;
6. The whole series of 05D 07D 10D adopts 15-inch reel and 24-inch feeder placement machine.