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BAS21J

Name: BAS21J
Rating: 4.7 (12 reviews)

GEN PURP DIODE 300V 0.225A SOD-

製造商
製造商。部分 #BAS21J
包 SC-76, SOD-323
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規格

Supplier	Yangzhou Yangjie Electronic Technology Co.,Ltd
Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Active
MountingType	Surface Mount
Package/Case	SC-76, SOD-323
SupplierDevicePackage	SOD-323

概述

Description

BAS21J is a small‑signal NPN transistor used in surface‑mount electronics for general‑purpose amplification and switching. It’s part of the BAS21 family and is typically offered in a 3‑lead SOT‑23 package. The “J” suffix is a vendor/packaging code (often RoHS/lead‑free); electrical specs vary by supplier, so always check the exact datasheet for your part.
Typical characteristics (for common BAS21J parts): Vce in the tens of volts, Ic up to a few tens of milliamps (often 50–100 mA), and moderate to high current gain (hFE broadly ~100–300). Some variants have high transition frequency (Ft) suitable for RF front‑ends and high‑speed switching.
Applications include general switching, buffering, small‑signal amplification, preamplifiers, and compact RF front ends where a low‑cost, compact NPN transistor is needed.
Design notes: bias with a suitable base resistor, ensure operation within the specified ratings, and consult the exact vendor datasheet for pinout and electrical limits.

Features

- NPN silicon small-signal transistor
- High-frequency performance suitable for RF/IF amplification and fast switching
- SMD, 3-pin package (SOT-23)
- RoHS compliant; available in standard reel/tape packaging
- Designed for general-purpose amplification and buffering with a wide gain range
- BAS21J variant offered by manufacturers for the same family characteristics in an SMD form factor
Note: exact electrical ratings (Vce, Ic, hFE, ft) vary by manufacturer; consult the specific datasheet for precise numbers.

Package

The BAS21J is supplied in the SOD-523 surface-mount package — a very small SMD diode package.

Pinout

- Pin count: 3 pins (SOT‑23 package).
- Function: BAS21J is a high‑voltage, fast small‑signal switching diode (single diode in an SOT‑23 package). It’s used for high‑speed switching, signal clipping, protection and detection in RF and general‑purpose circuits.

Manufacturer

The BAS21J switching diode is made by multiple semiconductor suppliers (common vendors include Diodes Incorporated, Vishay, Nexperia and ROHM). These companies are semiconductor manufacturers that design and produce discrete components (diodes, transistors), logic and analog ICs for consumer, industrial and automotive electronics.

Application

BAS21J is a general-purpose NPN transistor (SOT-23). Common applications: small-signal amplification and switching in consumer electronics; RF front-end, mixers and detector circuits; level shifting and logic interfacing; SMT prototyping and hobby projects; bias networks and low-power signal conditioning.

Equivalent

Direct/plug‑in equivalents: BAS21 (and variants BAS21A/BAS21C) from makers like Diodes, Nexperia, Vishay. Functional equivalents (note differing ratings and packages): 1N4148/1N914, BAV99, BAT54 — verify reverse voltage, forward drop, speed and package before substituting.