User Manual: CHANZON 1/4 Watt 1% High Precision Metal Film Resistors

Safety Warning

This section contains MANDATORY compliance terms. Violation of these operating procedures will result in product damage, circuit failure, and may cause serious safety hazards including fire and electric shock.

• Strictly prohibited from exceeding the rated power, rated voltage, and rated current marked on the product. Overloading will cause rapid temperature rise, burning, smoke emission, and pose a fire risk.
• The product operating ambient temperature must be controlled within -55°C to +125°C. Avoid proximity to open flames and high-temperature heat sources (such as heating elements or high-power chips). When used in non-ventilated environments, ensure adequate heat dissipation space is reserved.
• Prohibited for use in flammable/explosive environments, high-humidity conditions (relative humidity >85%), strongly corrosive atmospheres, or high-dust environments to prevent pin oxidation, film layer corrosion, and resultant short circuits or parameter drift.
• The resistor surface will experience temperature rise during continuous operation (noticeable for high-power specifications). Do not touch with bare hands to avoid high-temperature burns. Do not touch pins or body until cooled after soldering.
• Low-power through-hole metal film resistors are precision small components. Keep out of reach of children and pets to prevent accidental ingestion or pin puncture injuries.
• Disassembly, grinding, or modification of the resistor body is strictly prohibited. The product contains no user-serviceable internal components. Disassembly will damage the insulation protection layer, resulting in resistance failure or short circuits.
• During installation and soldering, strictly prohibit solder drips onto the insulating lacquer coating of the resistor body. The high temperature of molten solder will damage the film layer, causing performance degradation or immediate product scrapping.
• Discarded resistors constitute electronic waste. Do not dispose of with household garbage. They must be transferred to designated electronic waste recycling facilities in compliance with environmental protection regulations.

Product Overview

The CHANZON 1/4 Watt 1% High Precision Metal Film Resistors are designed for a wide range of electronic applications requiring stable and accurate resistance. These resistors feature a 1% tolerance and are available in a broad range of values from 0.1 ohm to 4.7M ohm. They are lead-free and RoHS compliant, ensuring environmental safety.

Specifications

General Characteristics

• Type: Metal Film Resistor
• Brand Name: CHANZON
• Origin: Mainland China
• Condition: New
• Accuracy: 1%
• is_customized: Yes
• High-concerned chemical: None

Electrical Characteristics

• Rated Power: 1/4 Watt (0.25W)
• Resistance Tolerance: 1%
• Operating Temperature: -55°C to +125°C
• Temperature Coefficient: Low (specific values vary by resistance, e.g., 2.2K, 220R, 6.2K, 75, 5K6, 510K, 390, 3.9, 3K9, 2K4, 470R, 3R3 K Color Fixed)

Physical Dimensions

• Lead Diameter: 0.5mm / 0.020inch
• Total Length: 58.5mm / 2.303inch
• Body Diameter: 2.3mm / 0.091inch
• Body Length: 6.5mm / 0.256inch
• Lead Length (each side): 26mm / 1.024inch

Packaging Information

• Package Type: Individual bags (e.g., 100pcs per bag)
• Package Length: 13 cm
• Package Width: 9 cm
• Package Weight: 0.036 kg

Environmental Compliance

• Lead-free
• RoHS Compliant

Setup and Installation Requirements

Soldering Equipment

• Use a temperature-controlled soldering iron set to 350°C ±20°C.
• Soldering time must be less than 3 seconds per cycle to avoid prolonged high-temperature exposure that could damage the lead plating and resistive film layer.

Mounting Clearance

• Maintain a distance of ≥5mm between the resistor body and the PCB solder pad during installation to prevent heat transfer from poor PCB heat dissipation.
• Strictly prohibited from bending leads flush against the resistor body.

Lead Forming

• Leads may be bent to accommodate PCB layout requirements, but the bend point must be ≥3mm from the resistor body.
• Recommended bending angle is less than 90°.
• Avoid violent bending to prevent lead fracture or internal film layer detachment.

Surface Preparation

• Clean PCB solder pads and resistor leads before soldering to remove oxide layers and oil contamination, ensuring good solder wetting and preventing cold solder joints or poor electrical contact.

Spacing Requirements

• When mounting multiple resistors side by side, maintain ≥2mm spacing between adjacent resistors (≥5mm for high-power specifications) to ensure ventilation and heat dissipation, preventing mutual thermal influence between adjacent components.

Operating Requirements

Power Compatibility

• This resistor is suitable for both DC and AC applications.
• Precisely match resistance value and power ratings to circuit design requirements.
• Strictly prohibited from substituting low-power resistors for high-power applications.

Surge Protection

• Avoid exposing resistors to standalone instantaneous high voltage or high current surges (such as inrush currents).
• If surge risks exist in the circuit, employ surge protection and current-limiting components.

Humidity Precautions

• Before use in high-humidity environments, verify the product shows no moisture absorption and leads show no oxidation.
• Otherwise, insulation resistance degradation and circuit leakage may occur.

EMI Considerations

• When used in precision circuits (such as instrumentation and testing equipment), avoid locating resistors near strong electromagnetic interference sources to prevent parameter drift affecting circuit accuracy.

Reading Resistor Values (Color Code)

Resistor values are indicated by color bands on the body. Refer to the chart below for decoding 4-band and 5-band resistors.

How to Read:

• 4-Band Resistors: The first two bands represent significant digits, the third band is the multiplier, and the fourth band is the tolerance.
• 5-Band Resistors: The first three bands represent significant digits, the fourth band is the multiplier, and the fifth band is the tolerance.

Storage and Maintenance

Storage Environment

• Before use, store products in sealed packaging at normal temperature (25°C ±5°C) and normal humidity (relative humidity 40%~70%).
• Keep away from corrosive gases and direct sunlight to prevent lead oxidation from long-term air exposure.

Shelf Life

• Under sealed packaging conditions, the product warranty period is 2 years from date of manufacture.
• After expiration, resistance value and insulation parameters must be retested before use.

Post-Opening Handling

• Use opened products promptly.
• Reseal remaining products with desiccant to prevent moisture absorption and oxidation.

Inspection Protocol

• During routine maintenance, immediately discontinue use and replace with new products of identical specifications if the resistor body shows paint cracking, peeling, lead oxidation/rust, surface blackening, or deformation.

Troubleshooting

Resistor Malfunctions

If you observe any of the following issues with the resistor body, discontinue use immediately and replace it with a new one of identical specifications:

• Paint cracking
• Peeling
• Lead oxidation or rust
• Surface blackening
• Deformation

Testing Precautions

• During circuit inspection, do not use multimeter high-resistance ranges for prolonged measurements, as the internal voltage may damage the resistive film.
• Always disconnect circuit power before measurement to prevent damage to instruments and products from energized testing.

User Tips

• Always double-check the color bands against the provided chart to ensure you are using the correct resistance value for your circuit.
• Proper soldering technique is crucial for the longevity and performance of the resistors. Ensure clean pads and leads, and avoid excessive heat.
• For projects requiring many different resistor values, consider organizing them immediately upon receipt to prevent mix-ups.

Warranty and Support

The product warranty period is 2 years from the date of manufacture, provided it is stored under sealed packaging conditions. For detailed information and further assistance, please refer to the official user manual PDF:

View User Manual (PDF)