2sb815 7 Tb E

The phrase "2sb815 7 tb e" refers to a specific PNP Bipolar Junction Transistor (BJT) manufactured by onsemi (formerly ON Semiconductor). Onsemi

1. Product Identity & Specifications

This component is a small-signal, low-voltage, high-current transistor designed for high-density mounting. Mouser

* Technical Profile: It features a collector-emitter voltage ($V_{CEO}$) of -15V and a continuous collector current ($I_C$) of -0.7A (700mA). Onsemi

* Performance: Its standout feature is a low saturation voltage ($V_{CE(sat)}$ typ. -60mV), making it highly energy-efficient for switching applications. Mouser

* The Suffix Decoder:

* 7: Refers to the DC Current Gain ($h_{FE}$) rank, ranging from 300 to 600. Onsemi

* TB: Indicates "Tape & Reel" packaging (typically 3,000 units/reel). Mouser

* E: Denotes that the product is Lead-Free (Pb-Free). Onsemi

2. Market Status: Obsolescence (EOL)

A critical insight for this part is its discontinuation. Mouser

* Official Status: onsemi has formally marked this device as Obsolete/Discontinued as of January 2026. OnsemiMouser

* Sourcing Challenge: While some stock remains at authorized distributors like Mouser and DigiKey, the manufacturer is no longer producing new units. DigikeyMouserTme Users in the design phase should avoid this part for new projects.

3. Market Trends & Insights (2026)

The obsolescence of the 2SB815 is reflective of broader shifts in the global semiconductor market: MaximizemarketresearchPrecedenceresearchSphericalinsights

* Shift to MOSFETs: The industry is rapidly moving from Bipolar Junction Transistors (BJTs) to Power MOSFETs in low-voltage applications. MOSFETs offer faster switching speeds and lower power loss, making them more cost-effective for modern energy-efficient designs. MaximizemarketresearchPrecedenceresearch

* Miniaturization (VoC): Despite the shift, there is still a niche for small-signal transistors in "tri-fold phones and earbuds" where ultra-thin power stages (e.g., SC-59 packages) are essential for dissipating minimal heat. Mordorintelligence

* Supply Chain Consolidation: Manufacturers like onsemi are streamlining their portfolios, retiring older BJT models in favor of integrated power management solutions or advanced SiC/GaN materials that command higher growth rates (projected 9-12% CAGR for advanced MOSFETs). FortunebusinessinsightsPrecedenceresearchMordorintelligence

4. Sourcing & Alternatives

If you are currently using this part, consider the following strategy: Linkedin

* Complementary Pair: The NPN version of this transistor is the 2SD1048, which is often used alongside the 2SB815 in push-pull amplifier circuits. Onsemi

* Verified Sourcing: Currently, units are available at prices ranging from $0.42 to $0.84 for quantities of 100+ pieces through B2B channels. Alibaba

* Recommended Replacements: Look for PNP transistors in the SC-59 or SOT-23 package with similar 15V/0.7A ratings, such as the BCP53 (though slightly larger in SOT-223) or modern low-$V_{CE(sat)}$ equivalents from ROHM or Diodes Inc. Alibaba