Product Overview

The SMD-2522 Series is a range of encapsulated surface-mount thermistors designed for circuit protection and general electronic applications. These NTC thermistors feature advanced encapsulation for excellent high-temperature and high-humidity performance, along with robust surge suppression capabilities. They are supplied in tape-and-reel packaging, compatible with lead-free reflow and wave soldering processes, making them ideal for automated assembly in industrial equipment, communication devices, consumer electronics, and automotive electronics.

Product Attributes

• Brand: Songtian ()
• Series: SMD-2522
• Encapsulation Material: Meets UL94-V0
• Packaging: Tape-and-reel
• Lead-Free Compatibility: Reflow/Wave Soldering
• Origin: Shantou Free Trade Zone Songtian Electronic Technology Co., Ltd.

Technical Specifications

Key Features

• Advanced encapsulation process with UL94-V0 rated material.
• Compact structure, small size, space-saving design.
• Superior performance under high temperature and high humidity conditions.
• Strong surge suppression capability.
• SMD tape-and-reel packaging suitable for lead-free reflow/wave soldering automatic placement.

Applications

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

Part Number Coding Principle

SMD NTC 2522 N XXXX XX M

• NTC: Negative Temperature Coefficient Thermistor
• SMD: Model
• 2522: Size (approx. 6.0*5.5mm)
• N: Foot Shape (Internal Fold)
• XXXX: 25 Zero-Power Resistance Value (e.g., 020: 2.0, 050: 5.0, 201: 200)
• XX: Max. Steady State Current (e.g., X5: 0.5A, 01: 1.0A, 04: 4.0A)
• M: Resistance Tolerance (L: 15%, M: 20%)

Product Marking Example

1. Songtian Logo
2. NTC (Negative Temperature Coefficient Thermistor)
3. 2522 (Size: approx. 6.0*5.5mm)
4. 050 (25 Zero-Power Resistance Value: 5.0)
5. M (Capacity Tolerance: M (20%))

Reliability Testing

Packaging Information

Tape Packaging (Unit: mm)

13-inch Reel Dimensions (Unit: mm)

Cardboard Box Packaging

Foot Shape N: Internal Fold

Curves

Resistance-Temperature Characteristic Curve

Maximum Current Derating Curve

ITa = [1-(Ta-25)/(Tu-25)]Imax

TU: Upper limit of working temperature ()
TL: Lower limit of working temperature ()
Ta: Ambient temperature ()
Imax: Maximum steady state current

Soldering Instructions

Lead-Free Reflow Soldering Curve

When reflow soldering capacitors, it should be performed under the following conditions:

• Soldering Temperature: 230260
• Soldering Time: 1030s
• Preheating Temperature: 170 max.

Wave Soldering Curve

Soldering Iron Rework Conditions

Storage Environment

• Store products under the following conditions and use within 6 months after delivery.
• Temperature: 10~30, Relative Humidity: 60% max.
• Solder NTC within 168 hours after opening the moisture-proof packaging. After opening the moisture-proof packaging, store the NTC in the moisture-proof packaging with desiccant and HIC card, and maintain the above state.
• If the storage period exceeds 6 months, or the indicator color of the attached HIC card changes after the package is opened, baking should be performed before soldering (60 * 168hr).
• Reference data for baking when product humidity exceeds requirements before reflow soldering, after the exposure time of opened products exceeds the bare-board life, or when other conditions cause the temperature and humidity around the product to exceed requirements (bare-board life starts from zero after baking).
• Do not store products in corrosive substances such as sulfur, chlorine gas, or acid, as this may cause pin oxidation and reduce solderability.
• To avoid the influence of moisture, dust, and other substances, products should be stored on shelves.
• Products stored in warehouses should avoid thermal shock, vibration, and direct sunlight.

Usage Precautions

• The working environment temperature should be within the range specified by the technical conditions.
• Do not install near heat-generating or flammable components; maintain a spacing of more than 3 mm to avoid damaging the components.
• Please wear gloves when touching the pins.
• This specification guarantees the quality of our products as individual components. When our products are installed in your company's products, please ensure that your company's products have been effectively evaluated and confirmed according to your company's specifications.
• If your company's trial use of our products exceeds the product functions defined by this test specification, our company will not guarantee failures caused by this.
• When the NTC is damaged, the failure may lead to a short circuit. To prevent dangerous situations such as burning, smoking, or fire in case of a short circuit, please set up an automatic fail-safe function using components such as fuses in the circuit.