5D-15 Negative Temperature Coefficient Thermistor

5D-15 Negative Temperature Coefficient (NTC) Thermistor is a cost-effective solution for inrush current suppression in electronic circuits. By limiting the initial surge of current when power is applied, it protects sensitive components and prolongs the lifespan of power supplies, adapters, and other electrical devices.

Key Features:

• Effective Inrush Current Limiting: Reduces initial power-on surges to protect downstream circuitry.
• Negative Temperature Coefficient: Resistance decreases as temperature rises, enabling automatic current regulation.
• Compact Disk Form: Saves board space while delivering reliable thermal performance.
• Durable Construction: Manufactured to withstand repeated cycling and harsh operating conditions.
• Economical Choice: Widely used for cost-sensitive consumer and industrial applications.

Technical Specifications:

• Resistance at 25 °C (R₂₅): 15 Ω ±20%
• Rated Current: Approximately 2–3 A (depending on cooling and application conditions)
• Maximum Steady-State Current: Up to 4 A with adequate heat dissipation
• Dissipation Factor: ~10 mW/°C (typical)
• Thermal Time Constant: ~20 seconds (approximate)
• Operating Temperature Range: −40 °C to +125 °C

Mechanical Specifications:

• Package Type: Radial leaded thermistor
• Body Material: Epoxy-coated disk element for moisture and mechanical protection
• Leads: Tinned copper wire for secure soldering
• Mounting: Through-hole PCB assembly

Dimensions:

• Disk Diameter: 15 mm nominal
• Body Thickness: ~5 mm
• Lead Diameter: ~0.8 mm
• Lead Spacing: 7.5 mm (approximate)

Pinout and Wiring:

• Lead 1: One terminal of the thermistor element
• Lead 2: Opposite terminal of the thermistor element
• Connection: Insert the thermistor in series with the AC line or DC input supply to suppress inrush current.

Datasheet Reference:

• 5D-15 datasheet

Applications:

• Power Supplies: Protect SMPS and linear supplies from inrush surges.
• Adapters and Chargers: Extend the life of consumer electronics by limiting startup stress.
• LED Drivers: Provide surge protection during power-on conditions.
• Motors and Transformers: Prevent nuisance tripping and damage due to high inrush currents.
• Home Appliances: Improve reliability of refrigerators, washing machines, and HVAC units.

Equivalent Models:

• NTC 5D-11: Similar device with smaller 11 mm disk size
• NTC 5D-20: Higher current handling capability with larger 20 mm disk
• MF72 Series: Alternative inrush current limiter thermistors from multiple manufacturers

Package Includes:

• 1 x 5D-15 Negative Temperature Coefficient Thermistor