Recommended Selection of 470K SMT High Voltage Resistors for 0603

The following is a detailed comparison and selection analysis of two 0603 packages, Fenghua High tech RVS03K4703FT and Tian'er Technology HR0603F470KP05Z, with 470k Ω± 1% high-voltage surface mount resistors. The comprehensive evaluation is based on parameter performance, application scenarios, and industry alternatives:

1、 Comparison of core parameters
|Parameters | Fenghua High tech RVS03K4703FT | Tian'er Technology HR0603F470KP05Z | Difference Explanation|
|Rated power | 0.1W (100mW) | 0.33W | Tian'er power is higher, suitable for higher power consumption scenarios|
|Working voltage | 300V (user specified) | 350V (user specified) | Tian'er has slightly better voltage tolerance|
|Temperature coefficient | ± 100ppm/℃ | ± 100ppm/℃ | Consistent, all conventional stability requirements can be met|
|Resistance accuracy | ± 1% | ± 1% | Consistent|
|Size | 0603 (1.6 × 0.8 × 0.45mm) | 0603 (standard) | Same packaging|
|Working temperature range | 55 ℃~155 ℃ | 55 ℃~155 ℃ | Consistent|
|RoHS Compliance | Compliant | Compliant | Consistent|
|Typical applications | General circuits, voltage divider, current limiting | High power density design, power module | Tian'er is more suitable for power sensitive fields|


2、 High voltage capability analysis
Voltage resistant design:
Both resistors claim to support operating voltages above 300V, but the standard rated voltage for the 0603 package is usually 75V (such as Huaxin Technology WR06X4703FTL). The high-voltage version requires special processes such as lengthening the electrode spacing and strengthening the ceramic substrate.   
Fenghua High tech: The testing conditions for 300V (such as continuous/instantaneous voltage) have not been disclosed.   
Tian'er Technology: Supports 350V at 0.1W power, possibly achieved through optimization of thick film materials.   
Suggestion: High voltage applications require strict verification of the manufacturer's voltage derating curve and life test report.

Security risks:
0603 has a small packaging size and is prone to arc breakdown under high voltage. If the actual circuit voltage is greater than 300V, it is recommended to use 1206 and above packages.

3、 Selection recommendation
Preferred Scenarios
1. Fenghua High tech RVS03K4703FT:
Suitable for cost sensitive consumer electronics with voltage ≤ 250V, such as power monitoring and LED drivers.   
2. Tian'er Technology HR0603F470KP05Z:
In high reliability scenarios (industrial power supplies, medical equipment), the voltage margin is higher (300V vs 350V), and stability is more advantageous in high voltage environments.   
Compliant with environmental regulations and suitable for export projects.

Alternative solutions
Conventional voltage requirement (<100V):
TE Connectivity CRG0603F470K（0.1W, ±1%）  
Bourns CR0603FX4703ELF（0.1W, ±100ppm/℃）  
High voltage and high power demand (>300V):
Tian'er CUH1206F470KP05Z (1206 package, 0.75W, voltage not disclosed but safer).

Summary and Suggestions
1. Tian'er Technology HR0603F470KP05Z: It has advantages in power and environmental compliance, suitable for high reliability designs below 350V, but requires a voltage test report upon request.   
2. Fenghua High tech RVS03K4703FT: It is only recommended for low-cost projects below 300V, and attention should be paid to RoHS risks.   
3. Use with caution in high-voltage scenarios 0603: If the voltage is consistently above 200V, it is strongly recommended to upgrade to a 1206/1210 package (such as the Tian'er CUH1206 series) to avoid the risk of breakdown.   

It is recommended to request the manufacturer's high-voltage life test report and IEC60115 safety certification documents before final selection to ensure that the actual circuit withstand voltage requirements are met.