CRH1206F490KP05Z 1206 Package 490KΩ 0.5W High Power Thick Film Chip Resistor

CRH1206F490KP05Z 1206 490K 0.5W Thick Film Resistor: Technical Analysis and Application Guide

1. Product Overview

The CRH1206F490KP05Z is a representative model from Ever Ohms' CRH series of high-power thick film chip resistors. This component features a standard 1206 package, a nominal resistance of 490KΩ, and a rated power of 0.5W, achieving superior power handling compared to conventional thick film resistors in the same package size. As a surface-mount passive component, the CRH1206F490KP05Z balances compact footprint with power dissipation capability, making it widely suitable for industrial control, power management, communication equipment, and consumer electronics applications.

Ever Ohms, a professional resistor manufacturer based in Taiwan, has built its CRH series on a reputation for high reliability and consistency. The 1206 490K 0.5W Ever Ohms resistor undergoes strict optimization in material formulation, screen-printing processes, and sintering temperature control, ensuring stable electrical performance even under harsh conditions such as high temperature and high humidity.

2. Part Number Decoding

Understanding the CRH1206F490KP05Z part number coding helps engineers quickly identify product parameters:

表格

The tolerance code F represents ±1% accuracy, suitable for voltage division, current sensing, and feedback circuits where resistance deviation must be tightly controlled. For applications with less stringent accuracy requirements, the same series also offers J-grade (±5%) options.

3. Core Electrical Specifications

3.1 Key Parameters Summary

The main technical specifications of the CRH1206F490KP05Z are as follows:

• Nominal Resistance: 490KΩ
• Resistance Tolerance: ±1%
• Rated Power: 0.5W (at 70°C ambient temperature)
• Temperature Coefficient (TCR): ±100ppm/°C
• Operating Temperature Range: -55°C ~ +155°C
• Maximum Working Voltage: 200V
• Maximum Overload Voltage: 400V
• Package Type: 1206 surface-mount device (SMD)
• Terminal Electrode: Three-layer terminal structure (nickel barrier + tin plating)

3.2 Power Derating Characteristics

The actual usable power of thick film resistors is closely related to ambient temperature. The CRH1206F490KP05Z can operate at full 0.5W power below 70°C; when ambient temperature exceeds 70°C, load power must be reduced according to the linear derating curve, reaching zero at 155°C. During thermal design, engineers should consider PCB copper area, ventilation conditions, and heat generation from adjacent components, reserving sufficient power margin. It is generally recommended that actual power consumption does not exceed 70% of the rated value.

3.3 Temperature Coefficient Analysis

A temperature coefficient of ±100ppm/°C means that across the full temperature range of -55°C to +155°C, the maximum resistance drift for 490KΩ is approximately ±10.29KΩ. For the 1206 490K 0.5W Ever Ohms resistor, this indicator represents a relatively good level within thick film technology and can meet the temperature stability requirements of most industrial-grade applications. If the circuit demands higher temperature stability (such as precision voltage references), metal film or thin film resistor solutions should be considered.

4. Process Structure and Material System

4.1 Thick Film Process Features

The CRH series is manufactured using the traditional thick film printing and sintering process. The resistive element consists of a resistor paste mixed with ruthenium-based (RuO₂) conductive phase, glass binder phase, and organic vehicle, which is screen-printed onto a 96% alumina ceramic substrate and sintered at high temperature to form a dense resistive film. Compared to the vacuum sputtering process of thin film resistors, thick film technology offers distinct advantages in cost control and high-power tolerance.

4.2 Terminal Electrode Structure

To enhance soldering reliability and anti-sulfuration performance, the CRH1206F490KP05Z adopts a three-layer terminal electrode structure: an inner silver-palladium conductor layer, a middle nickel barrier layer (preventing solder leaching), and an outer pure tin plating layer (compatible with lead-free soldering). This structural design effectively reduces the risk of terminal electrode failure and extends component service life in sulfur-containing environments.

4.3 Protective Layer Design

The resistor body surface is covered with two layers of glass protective glaze: a dense base glaze layer and a wear-resistant top glaze layer. This protection system provides electrical insulation and mechanical shielding while blocking moisture and harmful gases, serving as an important guarantee for the long-term stability of thick film resistors.

5. Typical Application Scenarios

5.1 Power and Power Circuits

In switching power supplies, DC-DC converters, and linear regulators, the 1206 490K 0.5W Ever Ohms resistor is commonly used as startup resistors, bleeder resistors, and voltage sensing divider networks. The high resistance value of 490KΩ combined with 0.5W power capacity allows it to withstand continuous power dissipation at higher voltages, while ±1% accuracy ensures precise divider ratios, contributing to improved output voltage regulation.

5.2 Industrial Control and Automation

PLC modules, servo drives, frequency inverters, and other industrial equipment contain numerous signal conditioning and isolation circuits. With its wide operating temperature range and good long-term stability, the CRH1206F490KP05Z is well-suited for use as optocoupler input current-limiting resistors, IGBT gate pull-down resistors, and bias resistors in analog frontends.

5.3 Communication and Networking Equipment

In routers, switches, 5G base stations, and other communication devices, this resistor model can be applied in RF frontend bias networks, power module feedback loops, and interface protection circuits. Its compact 1206 package facilitates high-density PCB layout, while the 0.5W power margin provides greater resilience against transient overloads.

5.4 Automotive Electronics (Grade Confirmation Required)

It is important to note that the standard CRH series is an industrial-grade product. For automotive electronics applications, confirmation should be made regarding whether Ever Ohms' AEC-Q200 certified series is required. For non-safety-critical automotive applications such as infotainment and body control modules, industrial-grade resistors may be used after thorough validation.

6. Selection Considerations and Alternatives

6.1 Key Selection Factors

When selecting the CRH1206F490KP05Z, engineers should focus on the following points:

1. Power Margin: Actual operating power should be below 70% of rated power, with further derating in high-temperature environments.
2. Voltage Rating Verification: Maximum working voltage is 200V; confirm no violation in high-voltage circuits.
3. Accuracy Matching: ±1% tolerance suits most applications; precision metering circuits require evaluation.
4. PCB Heat Dissipation: 1206 package cooling relies on pad copper area; adequate thermal copper should be reserved.
5. Soldering Process: Compatible with reflow and wave soldering; peak temperature not exceeding 260°C/10 seconds.

6.2 Same-Series Alternative Models

If the 490KΩ resistance value needs fine-tuning for specific applications, the Ever Ohms CRH series 1206 0.5W range also offers various adjacent resistance values such as 470KΩ and 510KΩ. In terms of accuracy, F-grade (±1%) and J-grade (±5%) can be interchanged based on actual requirements, though the impact of resistance deviation on circuit performance must be considered.

6.3 Cross-Brand Alternatives

Comparable products available in the market include Yageo RC series, RALEC RNP series, and UNI-ROYAL UR series. When substituting, parameters such as power, tolerance, TCR, and dimensions must be verified item by item—direct replacement based solely on package and resistance value is not advisable.

7. Procurement Channels and Supply Assurance

For customers requiring bulk procurement of 1206 490K 0.5W Ever Ohms resistors, selecting authorized distribution channels is essential. Shenzhen Shunhai Technology Co., Ltd., as an authorized distributor of Ever Ohms, maintains comprehensive in-stock inventory of the full CRH series specifications and can provide original factory technical support and quality assurance. The company specializes in passive component distribution, serving industries including industrial, communication, and consumer electronics, offering one-stop procurement services from component selection to delivery.

Additionally, Huanian Mall, a professional online electronic components procurement platform, also provides online ordering services for the CRH1206F490KP05Z. The platform supports both small-batch sample procurement and large-volume order fulfillment, with transparent pricing and prompt delivery, making it suitable for R&D prototyping and small-to-medium production runs.

Buyers are advised to confirm current inventory status, delivery lead times, and lot information with distributors before placing orders to ensure stable supply chain coordination.

8. Conclusion

The CRH1206F490KP05Z, as a high-power thick film chip resistor from Ever Ohms' CRH series, achieves 0.5W power handling in a 1206 package, combined with ±1% tolerance and ±100ppm/°C TCR, striking a good balance between performance, size, and cost. Its mature thick film process and reliable terminal electrode structure make it a common choice in industrial control, power management, and communication equipment. Engineers should conduct comprehensive evaluation considering thermal design, voltage rating verification, and accuracy requirements in practical applications, and procure through authorized channels to ensure product quality.

For complete datasheets or sample testing of the CRH1206F490KP05Z, please contact Shenzhen Shunhai Technology Co., Ltd. or visit Huanian Mall for professional support.