3.9R METAL FILM RESISTOR – KSH 5 at HIMASTORES Mombasa – best electronics in Kenya
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3.9R METAL FILM RESISTOR

SKU: HMJ855 Category: Capacitors and resistors
KSH 5.00
In Stock

Product Description

1/4W Metal Film Resistor

High-Precision Resistor for Electronics Projects

The 1/4W Metal Film Resistor is a high-quality passive electronic component designed for precision circuit applications. Featuring low noise, high stability, and tight tolerance, these resistors are essential building blocks for any electronics project, from simple LED circuits to complex microcontroller systems.

Metal film construction provides superior stability and low temperature coefficient
Available in various resistance values and tolerance options
Do not exceed 1/4W power rating - overheating will damage the component

Technical Specifications

ParameterValue
TypeMetal Film Resistor
Power Rating1/4W (0.25W)
Tolerance±1% (standard)
Resistance RangeVarious values available
Temperature Coefficient±50ppm/°C
Maximum Voltage250V
Operating Temperature-55°C ~ +155°C
Package TypeAxial Leads
Lead MaterialTinned Copper
Body MaterialHigh-grade ceramic core
CoatingFlame-retardant epoxy
RoHS CompliantYes

= Key Features =

High Precision - ±1% tolerance for accurate circuit performance

Low Noise - Ideal for audio and sensitive analog circuits

Stable Performance - Low temperature drift for consistent operation

1/4W Power Rating - Perfect for general purpose and signal circuits

Reliable Construction Highquality metal film deposition

Flame Retardant Safetycertified epoxy coating

Tinned Leads - Easy to solder

Color Coded Clear value identification with 5band coding

= Applications =

  • Power supplies and voltage regulators
  • Audio circuits and amplifiers
  • Signal processing and filtering
  • Microcontroller interfacing
  • LED current limiting
  • Pullup and pulldown circuits
  • Voltage dividers
  • Oscillator circuits
  • Sensors and measurement equipment
  • Consumer electronics
  • Prototyping and breadboarding
  • Arduino and Raspberry Pi projects

1/4W Power Rating Guidelines

Voltage (V)Current (mA)Resistance (Ω)Power (W)
5V50mA100Ω0.25W
12V20.8mA576Ω0.25W
24V10.4mA2.3KΩ0.25W

> Power (W) = Voltage² / Resistance OR Current² x Resistance

Always choose resistor with power rating at least 2x calculated power
Continuous operation at maximum rating reduces lifespan

Resistor Color Code

The resistor value is indicated by 4 or 5 color bands:

  • Band 1: First digit
  • Band 2: Second digit
  • Band 3: Multiplier
  • Band 4: Tolerance (±1% = Brown)
  • Band 5: Temperature coefficient (optional)
Use a multimeter to verify resistance before soldering
Always check color code reading with a meter

Why Choose Metal Film Resistors?

Superior to carbon film - lower noise and tighter tolerance
Longterm stability minimal value drift over time
Low temperature coefficient - consistent in varying temperatures
Flameretardant coating enhanced safety
1/4W rating - ideal for most electronic circuits
RoHS compliant - environmentally friendly

√ ±1% precision for accurate circuits

√ Low temperature drift

√ Excellent frequency characteristics

√ Low parasitic capacitance

√ Suitable for PCB and breadboard

√ Ideal for professional and hobbyist use

Installation Guidelines

  1. Identify correct resistance value using color codes
  2. Verify with multimeter before soldering
  3. Bend leads carefully - avoid damaging body
  4. Insert into PCB or breadboard
  5. Solder with appropriate temperature (≤350°C)
  6. Trim excess leads to 3-5mm length
Allow adequate spacing for air circulation
Use heat sink if operating near maximum power
Do not bend leads close to the resistor body

Safety Precautions

Do not exceed 1/4W power rating
Avoid mechanical stress on leads and body
Keep away from moisture and corrosive environments
Resistors may become hot - allow cooling before handling
Do not use damaged or overheated resistors
For high-voltage applications, maintain adequate spacing
Use series combination for higher voltage ratings

Avoid using in circuits exceeding 250V

Common Formulas

Ohm's Law:

  • Voltage Current × Resistance (V I × R)
  • Current Voltage / Resistance (I V / R)
  • Power Voltage² / Resistance (P V² / R)

Series Resistance:

  • R_total = R1 R2 R3 + ...

Parallel Resistance:

  • 1/R_total = 1/R1 1/R2 1/R3 + ...
Use these formulas to design your circuits correctly

Quick Reference

AttributeDetails
TypeMetal Film Resistor
Power Rating1/4W (0.25W)
Tolerance±1%
MountingThrough-hole
PackageAxial leads
Body ColorBlue / Light Blue
StandardsRoHS Compliant

= Maintenance and Storage =

√ Store in dry, anti-static environment

√ Handle by body to avoid lead damage

√ Keep away from strong magnetic fields

√ Check resistance periodically in critical applications

√ Replace if discolored or damaged

√ Store at room temperature

The 1/4W Metal Film Resistor - precision, reliability, and performance in one essential component. Perfect for all your electronics projects, from simple circuits to advanced systems.

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