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Explore practical uses for CHR0805-1 220kOhm resistors in South African circuits - signal conditioning, pull-ups, sensing, and precision work. Includes selection tips and application notes.
CHR0805-1 220kOhm resistors feature in filters, dividers, pull-ups, and ADC circuits.
Choose based on power, tolerance, and footprint for education, prototyping, or production.
Communica offers reliable supply for students and industry, with branch collection and VAT invoicing.
The CHR0805-1 220kOhm resistor is a surface-mount device (SMD) featuring a 0805 metric package (2.0mm x 1.25mm). With a resistance value of 220,000 ohms, these resistors are common in signal processing, analog front-ends, and microcontroller interfacing. Their compact form makes them standard in densely populated printed circuit boards, including commercial electronics and educational STEM kits found across South Africa.
CHR0805-1 resistors adhere to international SMD standards, offering different tolerance grades (typically 1% or 5%) and power ratings in the 1/8W to 1/10W range. This makes them suitable for low-to-moderate power applications and precision divider circuits.
In South African university labs, CHR0805-1 220kOhm resistors are frequently used for student development boards, instrument amplifiers, and industrial sensor modules. Their availability in bulk at suppliers like Communica supports prototyping through to small-run manufacturing.
| Parameter | Typical Value | Notes |
|---|---|---|
| Resistance | 220,000Ohm (220kOhm) | E24 Standard Value |
| Tolerance | 1% / 5% | Precision choice by project |
| Power Rating | 0.125W (1/8W) | Continuous rating at 70 degreesC |
| Package Size | 0805 (2.0 x 1.25 mm) | Standard SMD footprint |
| Temperature Coefficient | 200ppm/ degreesC | Typical for general use |
In analog-to-digital acquisition, 220kOhm resistors often help scale higher input voltages to microcontroller-safe levels.
| Example | Calculation |
|---|---|
| Input voltage (Vin): 5V R1 = 220kOhm, R2 = 220kOhm Vout = ? |
Vout = Vin x R2/(R1 + R2) = 5V x 220k/(220k+220k) = 2.5V |
220kOhm values are typical for low leakage digital inputs where minimal current draw is preferred. For microcontroller GPIOs in standby, this helps reduce overall system power consumption-important in battery-powered projects common in South African remote monitoring or IoT deployments.
Paired with a 1nF capacitor, a CHR0805-1 220kOhm resistor forms a low-pass filter:
Cutoff frequency: fc = 1 / (2piRC)
For R = 220,000Ohm, C = 1nF fc ~ 723 Hz
Signal In220kOhmSignal Out
|
1nF
|
GND
For high-resistance voltage reference or biasing, 220kOhm SMD resistors minimize current while offering stable voltages-useful in op-amp input bias or photodiode amplifiers.
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