At Topdiode, we manufacture a wide range of semiconductor components including transistors, diodes, and ICs in the SOT-23 (Small Outline Transistor) package. This surface-mount package is widely used due to its compact size, low profile, and ease of PCB integration — making it ideal for today’s compact and portable electronic products.
The SOT-23 package family includes several variants based on the number of pins, such as SOT-23-3, SOT-23-4, SOT-23-5, and SOT-23-6, which Topdiode offers to meet diverse application needs.
SOT-23-3
The most common version, featuring 3 pins. Typically used for small signal transistors, Zener diodes, and general-purpose switching applications.
SOT-23-4
A 4-pin version that supports more complex devices while retaining a small footprint.
SOT-23-5
Designed for low-power ICs like voltage detectors, op-amps, or logic ICs requiring more connections.
SOT-23-6
Suitable for multi-functional ICs, small microcontrollers, voltage regulators, and amplifiers.
Topdiode’s SOT-23 series is manufactured with strict quality control and is compliant with RoHS and halogen-free requirements, ensuring both performance and environmental safety.
Pin assignments in SOT-23 packages vary depending on the specific device. Below are a few common examples using Topdiode components:
NPN Transistor Example (e.g., Topdiode MMBT3906 in SOT-23):
Pin 1: Emitter
Pin 2: Base
Pin 3: Collector
Channel MOSFET Example (e.g., Topdiode 2N7002):
Pin 1: Gate (G)
Pin 2: Source (S)
Pin 3: Drain (D)
We recommend always referring to the Topdiode datasheet for accurate pinout and electrical characteristics.
✅ Ultra-Compact Design: Perfect for high-density layouts on PCBs
✅ Reliable SMT Compatibility: Supports fully automated surface mount assembly
✅ Low Parasitics: Improved high-frequency performance
✅ Wide Device Compatibility: Available for transistors, diodes, regulators, logic ICs, etc.
✅ Excellent Availability: Topdiode maintains strong stock and short lead time
Miniaturization: Enables compact product designs without sacrificing performance
High Manufacturing Efficiency: Optimized for SMT lines with low production cost
Thermal and Electrical Stability: Suitable for low- to medium-power applications
Global Support: We offer technical documentation, fast sample support, and engineering assistance
|
Feature |
SOT-23 (Topdiode) |
SOT-223 (Topdiode) |
|
Size |
Smaller |
Larger footprint |
|
Pin Count |
Typically 3–6 pins |
Typically 4 pins |
|
Power Handling |
Suitable for low-power applications |
Designed for medium- to high-power use |
|
Thermal Dissipation |
Limited due to size |
Enhanced heat dissipation |
|
Applications |
Small signal switching, logic ICs |
Voltage regulators, power transistors |
|
Mounting Type |
Surface Mount (SMT) |
Surface Mount (SMT) |
Topdiode provides both SOT-23 and SOT-223 packaged devices to meet different thermal and power requirements.
The SOT-23 package is a versatile and essential format in modern electronics manufacturing. At Topdiode, we are proud to offer a comprehensive lineup of SOT-23 and SOT-223 packaged products with fast lead times, competitive pricing, and reliable performance.
For further requests, datasheets, or samples, please contact our sales or engineering team at www.topdiodes.com.