The SAMWHA 1000uF 35V capacitor is a high-capacity, polarized electronic component designed for through-hole technology (THT) mounting. Manufactured by SAMWHA, a respected name in passive components, this aluminum electrolytic capacitor is a staple in power supplies, audio filtering, and voltage stabilization circuits due to its excellent capacitance-to-volume ratio.

Specifications

• Capacitance: 1000uF (Microfarads)
• Maximum Working Voltage: 35V DC
• Capacitance Tolerance: ± 20% (Standard for electrolytic capacitors)
• Mounting Type: Through-Hole Technology (THT) / Radial Leads
• Maximum Operating Temperature: Typically 85°C or 105°C (depending on the specific series, such as RD or WB)
• Dielectric Material: Aluminum Oxide / Liquid Electrolyte

Key Features

• High Bulk Capacitance: 1000uF provides a substantial charge reservoir, making it highly effective at smoothing out low-frequency AC ripples in power delivery networks.
• Polarized Design: Features a clearly marked negative terminal. It must be installed in the correct orientation to function safely.
• Robust Lead Construction: Standard radial wire leads allow for secure soldering onto prototyping boards, stripboards, or production PCBs.
• Excellent Ripple Current Handling: Engineered to handle the charge and discharge cycles inherent in filtering applications without excessive internal heating.

Common Applications

• Power Supply Filtering: Placed immediately after a bridge rectifier to smooth raw AC ripple into stable DC voltage.
• Audio Coupling and Decoupling: Used in amplifier circuits to block DC bias voltages while allowing low-frequency audio signals to pass through cleanly.
• Voltage Hold-Up / Buffering: Acts as a temporary energy reservoir to prevent microcontrollers or relays from resetting during brief power sags or current spikes.
• DC-DC Converter Output: Filters high-frequency switching noise on the output rails of buck or boost regulators.

Usage Tips

• Voltage Headroom: As a rule of thumb for longevity, never run a capacitor at its maximum rated voltage. For a 35V capacitor, it is best practice to use it in circuits with an operating voltage of 24V or lower.
• Heat Warning: Liquid electrolytes inside these capacitors can dry out over time, especially when exposed to heat. Position the capacitor away from high-temperature components like power resistors, transistors, or heatsinks.
• Correct Insertion: Double-check the polarity before powering on. Installing an electrolytic capacitor backward can cause it to overheat, vent gases, or violently rupture.
• Discharge Safety: A 1000uF capacitor can hold a painful residual charge even after the main device is turned off. Safe practice dictates discharging it through a low-value resistor (e.g., 1k) before handling or measuring it.