BJTs
Bipolar Junction Transistors (BJTs) are current-controlled devices used for signal amplification, switching, and voltage regulation in analog circuits, audio amplifiers, and legacy digital logic. Available in NPN and PNP configurations from Nexperia, onsemi, Vishay, Diodes Incorporated, and STMicroelectronics with parametric selection by collector-emitter voltage (VCEO), collector current (IC), gain (hFE), transition frequency (fT), and package.
Product Series & Base Models
481 model families directly associated with BJTs. Browse the full catalog with search and filters.
Browse BJTs Products
| PART NUMBER | MANUFACTURER | DESCRIPTION | STOCK | QTY / ACTION |
|---|---|---|---|---|
| UMZ1NT1G | onsemi | NPN/PNP BJT Transistor, 50V, 200mA, 114MHz, SC-88/SC70-6 | 864,000 | |
| UMC5NT2G | onsemi | Complementary Bipolar Digital Transistor (BRT), SC-88A (SC-70-5 / SOT-353), 3000-REEL | 810,000 | |
| UMC5NT1G | onsemi | Complementary Bipolar Digital Transistor (BRT), SC-88A (SC-70-5 / SOT-353), 3000-REEL | 810,000 | |
| UMC3NT1G | onsemi | Complementary Bipolar Digital Transistor (BRT), SC-88A (SC-70-5 / SOT-353), 3000-REEL | 702,000 | |
| TIP50G | onsemi | 400V 1A NPN BJT Power Transistor TO-220 | 65 | |
| TIP48G | onsemi | NPN BJT Power Transistor, 300V, 1A, TO-220 | 63,000 | |
| TIP47G | onsemi | NPN BJT 250V 1A 40W TO-220AB Transistor | 63,000 | |
| TIP42CG | onsemi | PNP BJT Power Transistor 100V 6A TO-220 | 28 |
How to Choose BJTs
A practical selection framework for BJTs covering specifications, packaging, lifecycle, and sourcing on Octatronics.
Define electrical and environmental requirements
Start with the required function and operating conditions for BJTs, then lock in critical parameters such as breakover voltage, on-state current, gate trigger current, holding current, and dv/dt capability. Match these against datasheet limits, not catalog summaries alone.
Validate package and land pattern compatibility
Confirm the BJTs package matches your PCB footprint, pick-and-place constraints, and moisture sensitivity handling. Verify reel/tape or tube packaging for production.
Check lifecycle, compliance, and alternates
Review lifecycle status (Active, NRND, EOL), RoHS, and approved alternate sources for BJTs before committing to high-volume builds. Use Octatronics cross-reference data when a drop-in replacement is needed.
Compare manufacturers and request pricing
Filter BJTs by manufacturers such as onsemi and ROHM, compare key specs side by side, then submit an RFQ with quantity, target delivery, and traceability requirements.
Related Selection Resources
Top BJTs Manufacturers
onsemi
onsemi BJTs products are available for part-number review, stock checks, and RFQ support.
28,226 productsROHM
ROHM BJTs products are available for part-number review, stock checks, and RFQ support.
3,980 productsTDK
TDK BJTs products are available for part-number review, stock checks, and RFQ support.
2,367 productsVishay
Vishay BJTs products are available for part-number review, stock checks, and RFQ support.
9,347 products
Nexperia
Nexperia BJTs products are available for part-number review, stock checks, and RFQ support.
3,317 productsPanjit
Panjit BJTs products are available for part-number review, stock checks, and RFQ support.
687 products
Infineon Technologies
Infineon Technologies BJTs products are available for part-number review, stock checks, and RFQ support.
20,310 products
NXP Semiconductors
NXP Semiconductors BJTs products are available for part-number review, stock checks, and RFQ support.
20,288 products
Microchip Technology
Microchip Technology BJTs products are available for part-number review, stock checks, and RFQ support.
67,462 products
Texas Instruments
Texas Instruments BJTs products are available for part-number review, stock checks, and RFQ support.
84,045 productsAbout BJTs
Frequently Asked Questions
Octatronics can help source a wide range of BJTs from major manufacturers worldwide, including active production parts, long-lead-time items, and hard-to-find components.
Yes. You can submit a single part number or upload a BOM with multiple parts. Our team will check stock, date code, lead time, and pricing for each item.
Availability depends on the specific part number and supplier source. For important orders, buyers can request packaging photos, labels, date code information, and traceability documents.
Yes. Octatronics supports sourcing for active, end-of-life, obsolete, and hard-to-find components through our global supplier network.
Please provide the part number, manufacturer, quantity, required date code, target price, delivery country, and whether original packaging or COC is required.
Articles & Technology
View All →PNP vs NPN vs P-Channel MOSFET: How to Choose the Right Transistor for Switching Circuits
PNP, NPN, and MOSFET transistors are widely used for electronic switching and control applications, but each device has different operating principles and performance characteristics. This guide explains the key differences between PNP vs NPN vs MOSFET, including switching behavior, efficiency, applications, and how engineers select the right transistor for different circuit designs.
MOSFET vs BJT: Key Differences, Working Principles, and Engineering Selection Guide
MOSFET and BJT are two fundamental transistor technologies used in electronic circuits. This guide explains the key differences between MOSFET vs BJT, including control methods, switching speed, efficiency, thermal behavior, and real-world applications. Learn how engineers select the right transistor for different circuit designs.
PNP Bipolar Junction Transistor (BJT): Definition, Working Principle, and Core Electronics Concepts
The PNP bipolar junction transistor is a current-controlled semiconductor device used in switching and amplification. This guide explains its working principle, structure, biasing behavior, and differences compared to NPN transistors in a clear, structured format for electronics learners and engineers.
Field Emission Transistor Explained: Vacuum FETs, Field Emission Devices, and How They Differ from FETs
A field emission transistor is a device concept that uses strong electric fields to extract electrons from an emitter, often through quantum tunneling, and then controls or collects those electrons using nearby electrodes. Unlike a conventional field effect transistor, which controls current through a semiconductor channel, many field emission transistor concepts are related to vacuum electronics, vacuum field emission transistors, nanoscale vacuum channel transistors, and advanced field emission devices.
What Is a Field Effect Transistor? FET Types, Working Principle, Applications, and Selection Guide
A Field Effect Transistor, commonly called a FET, is a voltage-controlled semiconductor device that uses an electric field to control current flow between two terminals called the source and drain. Unlike bipolar junction transistors, which require input current at the base, FETs are controlled mainly by voltage at the gate terminal. This gives FETs high input impedance, low control power, and strong advantages in switching, amplification, power management, RF circuits, sensor interfaces, and modern integrated circuits.