• What is the difference between pwr and SWR and how to select?

  • 创建于2024-06-23

    pwr,precision,ence,select pwr,precision,ence,select pwr,precision,ence,select pwr,precision,ence,select

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What's the difference between standard and custom products?

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What is the difference between the BT880/1 and the BT882/3?

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For BD37033FV-M,BD37034FV-M, What is the difference between the two products?

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How does Walmate ensure the quality of my parts?

Walmate takes a proactive approach to customer’s quality concerns from the initial communication, providing cost-effective and rationalized advice from designs, materials, production processes, manufacturability, etc. Once your order is confirmed, we will perform a full Design for Manufacturing (DFM) review to point out any issues that our engineers feel may affect the quality of your parts. We have the ability to share inspection data with you in real-time so we can work together to address any quality issues you may have during production. All incoming materials will meet your design specifications. Final inspection reports before shipment.

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How to select initial resistance for RT trimmable resistor?

The initial resistance of Viking trimmable resistance (RT series) is the target value that customer required. Because resistance will be increased by laser trimming, precision is shown by negative values. The precision determines trimming range, length and characteristics which enables customer to select according to actual needs.

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Which series is included in foil process? What is difference from alloy process?

Alloy products of Viking include metal foil and metal strip. The former refers to alloy patch and the latter refers to the alloy. Foil process attaches alloy patch on ceramics substrate to form a resistance layer while alloy process produces complete resistor with alloy material. Foil process includes CSM series and MF, MF.A series and alloy process has LR, LRP, LRJ and LRS series. The common feature is Low TCR. Foil process can be laser trimmed and is able to produce continuous resistance within the range of resistance, so it is convenient to customize the resistance according to customer needs. Due to the limitations of materials and design, the alloy process can produce relatively less resistances, but has good current resistance.

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For the ML62Q1000 series functional timer, what is the difference between FTMnP and FTMnN outputs?

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What is the function of jumper? Why precision is not required by 0Ω?

Jumper resistor is also known as 0Ω resistor. ① In circuit design, the power supply can be separated as multiple channels with 0Ω resistor for commissioning or compatible design. ② It can be used as jumper. If certain section of the line is not used, just simply attached a 0Ω resistor (appearance will not be affected). ③ When the parameter of the matching circuit is uncertain, it can be replaced by 0Ω first and replace it with component with specific value during commissioning. ④ When wiring is impossible, you can also add a 0Ω resistor. ⑤ Under high-frequency signal, it can act as inductor or capacitor (related to the characteristics of external circuit) for dealing with EMC problems. ⑥ Used for cross-over connection of current circuit to provide shorter returning path and reduce interference. ⑦ Sometimes, user will change settings during circuit configuration. In order to reduce maintenance cost, 0Ω resistor can be used as alternative of jumper and welded on board. The actual resistance of a 0Ω resistor is not zero, the definition of which is ≦50mΩ (or ≦20mΩ). Therefore, parts with ±1% or ±5% share the same specifications. For functional perspective, jumper resistance dose not require precision. What user needed is the maximum rated current (i.e. current allowed to pass) instead of cannot be purchased or produced.

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Variation of film thickness and recommendation for 0.1%.

It is recommended to use thin film for 0.1% high precision product for better resistance consistency. The 0.1% precision for resistance of thick film is obtained by screening. The product consistency and stability are far less than thin film resistor. From the perspective of product structure, the biggest difference is the material and manufacturing method of the resistance layer. Thin film applies target material to let alloy film layer formed on ceramics substrate by using vacuum coating to shape resistance layer with <1um general thickness. Thick film forms resistance layer on ceramics substrate by applying printing resistance ink with 5~10um thickness; that is why it is called thick film. Because of the different thickness of the resistor, laser trimming method is vary as well which determines the various characteristics of the products. The characteristic of thin film resistor focuses on high precision, low TCR and stability.

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What is the difference between CS and RS? Why TCR of CS is better than RS?

CS and RS have the same design and similar product characteristics. Better TCR features are due to various material characteristics and process conditions with higher cost. Low-resistance product usually uses larger current and temperature raising of which will affect performance of circuit design due to resistance drift. Therefore, selecting resistor with better TCR can slow resistance drift to stabilize circuit.

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DURABLE CAPACITORS FOR EXCEPTIONAL PERFORMANCE

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Pulse information of CS low-resistance products

All resistors have pulse characteristics and the difference is only the strength of the characteristics. CS is a general ultra-low resistance product which does not have pulse control in both design and process. Pulse varies greatly between production batches. If the current data is included, it will cause misunderstanding when designing and selecting models. Moreover, the ultra-low resistance products have relatively large variations in current design which will also affect performance of pulse characteristics; so they are not intended to be put in. It is recommended that customer provides practical applications for suitable product suggestion.

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What is the difference between automotive grade product and ordinary ones? Why automotive grade resistor is more expensive with the same MDS?

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I want to use FRD products connected in series directly. Is there anything I have to pay attention?

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