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BAS21-QR

Name: BAS21-QR
Rating: 4.7 (12 reviews)

DIODE SCHOTT 200V 200MA TO236AB

製造商
製造商。部分 #BAS21-QR
包 TO-236-3, SC-59, SOT-23-3
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規格

Supplier	Nexperia USA Inc.
Package	Bulk
Series	Automotive, AEC-Q101
ProductStatus	Active
DiodeType	Schottky
Voltage-DCReverse(Vr)(Max)	200 V
Current-AverageRectified(Io)	200mA (DC)
Voltage-Forward(Vf)(Max)@If	1.25 V @ 200 mA
Speed	Small Signal =< 200mA (Io), Any Speed
ReverseRecoveryTime(trr)	50 ns
Current-ReverseLeakage@Vr	100 nA @ 200 V
Capacitance@VrF	5pF @ 0V, 1MHz
MountingType	Surface Mount
Package/Case	TO-236-3, SC-59, SOT-23-3
SupplierDevicePackage	TO-236AB

概述

Description

BAS21-QR is a variant of the BAS21 small-signal transistor. It is a general-purpose NPN transistor used for fast switching and low-noise signal amplification in compact SMD packages (typically SOT-23). The “QR” suffix usually denotes a specific packaging/lead-frame or RoHS/reel option chosen by the manufacturer.
Key points:
- Type: NPN small-signal transistor
- Package: SMD (commonly SOT-23) with a QR variant marking
- Applications: high-frequency signal amplification, RF front-ends, level shifting, fast switching in compact circuits
- Important: exact electrical ratings (Vce, Ic, hFE, ft) and pinout vary by vendor. Always consult the specific manufacturer’s datasheet for BAS21-QR.
If you share the supplier or a link to the datasheet, I can pull precise specs.

Features

- Fast-switching, small-signal silicon diode (BAS21 family)
- High-speed reverse-recovery suitable for switching circuits
- Low forward voltage drop and low junction capacitance
- General-purpose diode for rectification, demodulation, clamping, and logic-level applications
- RoHS compliant, Pb-free
- Surface-mount SMT package with QR-tape/reel packaging for automated assembly

Package

Package type: BAS21-QR is a BAS21 small‑signal fast switching diode in an SOT-23 (3-pin) surface‑mount package. The -QR suffix usually denotes tape‑and‑reel packaging (RoHS compliant).

Pinout

- Pin count: 2 (anode and cathode)
- Function: Fast-switching small-signal diode used for general-purpose switching/rectification in high-speed circuits.

Manufacturer

Manufacturer: Nexperia.
What kind of company: A global semiconductor company that designs and manufactures discrete components (diodes, transistors), logic devices, and MOSFETs for electronics.

Application

- High-frequency NPN small-signal transistor in SOT-23 (BAS21-QR)
- RF/IF amplification, switching, buffering in analog/digital circuits
- Preamplifiers and RF front-ends (AM/FM receivers)
- Low-noise, general-purpose amplification up to hundreds of MHz
- Used in mobile devices, consumer electronics, telecom equipment, and other small-signal RF circuits

Equivalent

BAS21-QR is a small-signal NPN transistor in SOT-23. Common equivalents (SMD): MMBT3904 (and MMBT3904LT1G), BC847B/BC847, and other 2N3904 family parts in SMD form. Through-hole substitutes: 2N3904, BC547. Always verify Vce, Ic, and hFE against the BAS21-QR datasheet before replacing.