Product Overview

The SMD-3225 Series Sealed Chip Thermistor is designed for circuit protection and electronic applications. Featuring advanced encapsulation technology with UL94-V0 rated materials, these thermistors offer a compact size, space-saving design, and superior performance in high temperature and humidity environments. They possess strong surge suppression capabilities and are supplied in SMD tape packaging, compatible with lead-free reflow/wave soldering for automatic mounting.

Product Attributes

• Brand: Songtian ()
• Product Type: Encapsulated Chip Thermistor
• Series: SMD-3225
• Technology: Negative Temperature Coefficient (NTC)
• Packaging: SMD Tape Reel
• Certifications/Standards: UL94-V0 rated encapsulation material
• Origin: SHANTOU FREE TRADE ZONE SONGTIAN ELECTRONIC TECHNOLOGY CO.,LTD

Technical Specifications

General Specifications

Product Dimensions

SMD-3225 Series Dimensions (Approximate): 8.1mm x 6.0mm

Dimensions for 'W' (External Fold) Lead Type:

Solder Pad Dimensions for 'W' (External Fold) Lead Type:

Dimensions for 'N' (Internal Fold) Lead Type:

Solder Pad Dimensions for 'N' (Internal Fold) Lead Type:

Electrical Performance Table (Sample)

Applications

• Circuit Protection
• Industrial Equipment
• Communication Equipment
• Consumer Electronics
• Automotive Electronics

Part Number Encoding Principle

SMD NTC 3225 N 2R5 05 M 0

• NTC: Negative Temperature Coefficient Thermistor
• 3225: Model, Size 8.1*6.0mm
• N: Lead Shape (Internal Fold)
• W: Lead Shape (External Fold)
• 2R5: Zero-Power Resistance at 25 (e.g., 2.5)
• 05: Max Steady Current (e.g., 5.0A)
• M: Resistance Tolerance (e.g., 20%)

Marking Example

1. Songtian Logo
2. NTC (Negative Temperature Coefficient Thermistor)
3. 3225 (Size: 3225 8.1*6.0mm)
4. 050 (Zero-Power Resistance at 25: 5.0)
5. M (Resistance Tolerance: M (20%))

Packaging Information

Tape & Reel Packaging Dimensions (Unit: mm)

15-inch Reel Dimensions (Unit: mm)

Soldering Instructions

Lead-Free Reflow Soldering Curve:

• Welding Temperature: 230260
• Welding Time: 1030s
• Preheating Temperature: 170 max

Wave Soldering Curve:

(Details not provided in source text)

Soldering Iron Rework Conditions:

Storage Environment

• Recommended Storage Conditions: Temperature: 10~30, Relative Humidity: 60% max.
• Use within 6 months of delivery.
• Solder NTC within 168 hours after opening moisture-proof packaging.
• If storage period exceeds 6 months or HIC card indicator changes color, baking (60 * 168hr) is required before soldering.
• Avoid storage in corrosive substances (sulfur, chlorine gas, acid).
• Store on shelves to avoid moisture, dust, heat shock, vibration, and direct light.

Usage Precautions

• Ensure operating ambient temperature is within specified technical conditions.
• Maintain a distance of >3mm from heat-generating or combustible components.
• Wear gloves when handling leads.
• This specification guarantees product quality as a standalone unit. Ensure your product is effectively evaluated and confirmed according to your specifications when integrating our product.
• Songtian is not liable for failures caused by use beyond the defined product functions in this specification.
• In case of NTC failure, implement fail-safe functions (e.g., using fuses) to prevent hazards like overheating, smoking, or fire in case of short circuits.