1. Introduction
The ALIENTEK T90 series smart soldering iron is a high-performance, portable welding tool designed for precision work. Featuring adjustable temperature, PD3.1/QC3.0 fast charging protocol support, and intelligent temperature control, it offers efficiency and accuracy for various soldering applications. This manual provides essential information for the safe and effective use of your T90 soldering iron.

Figure 1: ALIENTEK T90 Smart Soldering Iron Overview
2. Safety Precautions
- Always use the soldering iron in a well-ventilated area.
- Avoid touching the soldering tip or heating element when hot.
- Keep out of reach of children.
- Ensure the power supply matches the device's requirements (DC 9-28V).
- Unplug the device when not in use or before performing maintenance.
- Do not use the soldering iron near flammable materials.
3. Product Components
The standard package for the T90C model typically includes the following items. Contents may vary slightly depending on the specific model (T90A, T90B) and purchased kit.

Figure 2: T90C Soldering Iron Standard Package
- ALIENTEK T90 Soldering Iron (T90A, T90B, or T90C model)
- Compatible Soldering Tip (e.g., T65-KR Tip for T90C)
- C2C Cable (140W)
- Soldering Iron Stand (e.g., TH50)
- Instruction Manual (this document)
- Packaging Box
4. Setup Instructions
4.1. Power Supply Connection
- Connect the provided C2C cable to the Type-C port on the soldering iron.
- Connect the other end of the C2C cable to a compatible PD3.1/QC3.0 fast-charging adapter or power bank. The device supports a working voltage range of DC 9-28V.
- Important Note: For 140W heating power, a 140W fast-charging adapter (purchased separately) and a 140W C2C cable (standard or included in the package) are required. The main unit does not have a built-in battery and must be powered by an external power source.
- If the soldering iron restarts frequently, it indicates that the power supply does not match the current setting. Manually adjust to a lower voltage setting in the menu.
- It is normal for fast-charging adapters to have induced electricity. If you are sensitive to this, it is recommended to use a power bank for power supply.
4.2. Soldering Tip Installation
The T90 series uses specific heating cores:
- T90A corresponds to the T210 series soldering iron tip.
- T90B corresponds to the T245 series soldering iron tip.
- T90C corresponds to the T65 series soldering iron tip.
These tips are NOT universal. Please ensure you use the correct tip for your specific T90 model.

Figure 3: T90 Model and Tip Compatibility
- Carefully insert the correct soldering tip into the heating core receptacle of the soldering iron.
- Ensure the tip is securely seated.
5. Operating Instructions
5.1. Power On and Interface Overview
Once connected to a power source, the soldering iron will power on and display information on its 0.99' IPS LCD screen.

Figure 4: Interface Introduction
The display shows various parameters:
- Set temperature
- Three-speed quick temperature settings
- Real-time temperature
- Heating power bar
- Handheld induction sign
- Operating voltage
- Heating current
- Heating power
5.2. Temperature Adjustment
The T90 series features PID temperature control for accurate and stable heating (stability of 2%). The temperature range is 80-450°C.
- Quick Temperature Adjustment: Use the designated buttons (Key A/B) to quickly cycle through preset temperatures (e.g., 200°C, 350°C, 450°C).
- Fine Temperature Adjustment: Access the multifunctional menu to set precise temperatures.

Figure 5: PID Temperature Control Performance
5.3. Power Adjustment
The heating power is adjustable from 18W to 140W. This allows for adaptive use with various PD fast-charging adapters.

Figure 6: Power Adjustment Interface
- Default Gear: The device offers several default power gears (e.g., 140W, 100W, 65W, 36W, 24W, 27W, 18W) based on the input voltage.
- Automatic Adaptation: Select "Auto" to adapt to the maximum power of your PD fast-charging adapter.
- Fine-tuning: After selecting a power gear, the current can be fine-tuned to achieve precise power adjustment. Refer to the on-screen instructions for fine-tuning.
5.4. Multifunctional Menu
The T90 features a multifunctional menu accessible via the device's buttons. This menu allows you to configure various settings:

Figure 7: Multifunctional Menu
- Sleep Temperature: Set the temperature the iron will maintain during sleep mode.
- Standby Time: Configure the duration before the iron enters sleep mode.
- Working Voltage: View current voltage information.
- Temperature Step: Adjust the increment for temperature changes.
- Language Settings: Supports multiple languages, including Celsius and Fahrenheit units.
- Automatic Shutdown: Configure automatic shutdown settings.
5.5. Inductive Sleep
The inductive sleep feature helps extend the service life of the heating core and saves power.

Figure 8: Inductive Sleep Functionality
- The soldering iron enters sleep mode when placed down, indicated by the display disappearing.
- Picking up the iron will automatically wake it up and resume operation.
6. Maintenance
6.1. General Care
- Keep the soldering iron clean and free from solder residue.
- Use a damp sponge or brass wool to clean the tip regularly during use.
- Store the iron in its stand or a safe place when not in use.
6.2. Soldering Tip Maintenance
Proper maintenance of soldering tips ensures optimal performance and longevity.

Figure 9: 210 Series Soldering Tips

Figure 10: 245 Series Soldering Tips

Figure 11: T65 Series Soldering Tips
- Ensure the correct tip type (T210, T245, or T65 series) is used for your specific T90 model.
- Regularly inspect tips for wear and tear. Replace worn tips to maintain soldering quality.
- When storing, tin the tip with a small amount of solder to prevent oxidation.
7. Troubleshooting
- Soldering Iron Restarts: If the soldering iron frequently restarts, it indicates that the connected power supply does not match the current power setting. Access the menu and manually adjust to a lower voltage or power setting.
- Temperature Fluctuations with New Tip: When using a new heating core, it is normal to experience initial temperature fluctuations or erratic temperature changes. The device will stabilize after repeated use several times.
- Induced Electricity with Fast Charger: Some fast-charging adapters may cause a sensation of induced electricity. This is normal. If you are sensitive to this, it is recommended to use a power bank as a power source.
- No Power/Display: Ensure the Type-C cable is securely connected to both the soldering iron and the power adapter/power bank. Verify that the power source is functioning correctly.
8. Specifications
The ALIENTEK T90 series offers different models with varying power and tip compatibility. Below is a detailed comparison:

Figure 12: T90 Series Model Comparison
| Feature | T90A | T90B | T90C |
|---|---|---|---|
| Power Port | Type-C | ||
| Operating Voltage | DC 9-28V | ||
| Fast Charging Protocol | PD3.1/QC3.0 | ||
| Temperature Range | 80-450°C | ||
| Heating Power (Adjustable) | ≈18-65W | ≈18-140W | ≈18-130W |
| Screen | 0.99' IPS LCD (160*40 Pixel) | ||
| Handle Size | L178mm Ø16mm | ||
| Overall Weight | ≈55g | ||
| Tip Type | T210 Series | T245 Series | T65 Series |
| Resistance | 2.1Ω | 2.5Ω | 6.0Ω |
| Melting Time | ≈2.5S (65W) | ≈3.5S (140W) | ≈5.0S (130W) |
| Body Material | Aluminum alloy + sandblasting | ||
Note: The recommended working power for T90A is 65W. Using it at an excessive power may affect the lifespan of the heating core. The resistance value of the T90C heating core is 6Ω. According to P=U*U/R, U=28V, the maximum heating power is 130W.
9. User Tips
- Optimal Power Matching: Always ensure your power adapter can deliver sufficient power for your desired heating. If the iron restarts, reduce the power setting or use a more powerful adapter.
- New Tip Break-in: When using a brand new soldering tip, allow it to heat up and cool down a few times. This helps stabilize its temperature performance.
- Leverage Inductive Sleep: Utilize the inductive sleep feature by placing the iron in its stand when not actively soldering. This prolongs the life of the heating core and conserves energy.
- Clean Tips Regularly: Keep your soldering tips clean by wiping them on a damp sponge or brass wool. A clean tip ensures better heat transfer and prevents oxidation.
- Tinning for Longevity: Before storing the soldering iron, apply a small amount of fresh solder to the tip. This 'tins' the tip, protecting it from oxidation and extending its lifespan.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the ALIENTEK customer service department. Keep your proof of purchase for any warranty claims.





