規格
| 屬性 | 價值 |
| Supplier | Yangzhou Yangjie Electronic Technology Co.,Ltd |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Mounting Type | Surface Mount |
| Supplier Device Package | SOD-323 |
概述
Description
BAS21J is a course code used by different universities, so its exact meaning and syllabus vary by institution. Without the specific university or program, I can’t give a precise introduction.
Generally, Introduction to BAS21J would be an entry-level unit that:
- explains the scope and aims of the BAS program
- outlines key topics
- lists learning outcomes
- states prerequisites and contact hours
- describes assessment methods (e.g., quizzes, assignments, exam, project)
- provides recommended readings and software/tools
- offers tips for success (time management, labs, tutorials)
If you share the university or department (e.g., BAS stands for Business Analytics, Bachelor of Applied Science, etc.), I can provide a precise summary or syllabus.
Generally, Introduction to BAS21J would be an entry-level unit that:
- explains the scope and aims of the BAS program
- outlines key topics
- lists learning outcomes
- states prerequisites and contact hours
- describes assessment methods (e.g., quizzes, assignments, exam, project)
- provides recommended readings and software/tools
- offers tips for success (time management, labs, tutorials)
If you share the university or department (e.g., BAS stands for Business Analytics, Bachelor of Applied Science, etc.), I can provide a precise summary or syllabus.
Equivalent
BAS21J is a small-signal NPN transistor (SOT-23). Common equivalents include:
- MMBT3904 (SOT-23)
- PMBT3904 / MMBT3904
- BC847A / BC847B / BC846B (SOT-23)
- Through-hole: 2N3904
Notes: choose based on Vce, Ic, and hFE specs for your circuit.
- MMBT3904 (SOT-23)
- PMBT3904 / MMBT3904
- BC847A / BC847B / BC846B (SOT-23)
- Through-hole: 2N3904
Notes: choose based on Vce, Ic, and hFE specs for your circuit.
Features
Here are typical features of BAS21J:
- NPN silicon small-signal transistor
- Package: SOT-23 (3-pin), lead-free/RoHS compliant
- Max Vce: 60 V
- Max Ic: ~200 mA
- High-speed switching with ft in the hundreds of MHz range
- DC current gain (hFE): ~100–300 (depends on Ic and operating point)
- Vce(sat): ~0.2–0.4 V at moderate Ic (e.g., 10 mA) and Ib
- Temperature range: approx. -55 to +150 °C
- Suitable for general-purpose switching and amplification
Note: exact parameters vary by lot and manufacturer; consult the specific datasheet for precise values.
- NPN silicon small-signal transistor
- Package: SOT-23 (3-pin), lead-free/RoHS compliant
- Max Vce: 60 V
- Max Ic: ~200 mA
- High-speed switching with ft in the hundreds of MHz range
- DC current gain (hFE): ~100–300 (depends on Ic and operating point)
- Vce(sat): ~0.2–0.4 V at moderate Ic (e.g., 10 mA) and Ib
- Temperature range: approx. -55 to +150 °C
- Suitable for general-purpose switching and amplification
Note: exact parameters vary by lot and manufacturer; consult the specific datasheet for precise values.
Pinout
- Pin count: 3
- Function: BAS21J is a small-signal NPN transistor (general-purpose) used for switching and amplification, typically in an SOT-23 package.
- Function: BAS21J is a small-signal NPN transistor (general-purpose) used for switching and amplification, typically in an SOT-23 package.
Manufacturer
- Manufacturer: Nexperia (the BAS21J diode is one of their parts; Nexperia markets BAS21 series).
- What kind of company: A global semiconductor company specializing in discrete components (diodes, transistors, switches) and related passive/ESD devices. It originated as Philips Semiconductors and is now an independent Dutch company.
- What kind of company: A global semiconductor company specializing in discrete components (diodes, transistors, switches) and related passive/ESD devices. It originated as Philips Semiconductors and is now an independent Dutch company.
Application
BAS21J is a small‑signal silicon switching diode. Typical applications:
- Fast switching in logic/timing circuits
- Envelope detection and demodulation in RF receivers
- Precision rectification in op‑amp circuits
- Clipping/limiter and peak-detection stages
- Input protection and clamping for sensitive circuitry
- General-purpose low-current rectification in analog front ends
- Fast switching in logic/timing circuits
- Envelope detection and demodulation in RF receivers
- Precision rectification in op‑amp circuits
- Clipping/limiter and peak-detection stages
- Input protection and clamping for sensitive circuitry
- General-purpose low-current rectification in analog front ends
Package
BAS21J is a small-signal switching diode packaged in a SOT-23 (3-pin) surface-mount package.
