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BAS21-QR

Name: BAS21-QR
Rating: 4.8 (15 reviews)

+BOM

DIODE SCHOTT 200V 200MA TO236AB

제조업체넥스페리아 USA 주식회사
제조업체 부품 #BAS21-QR
데이터시트 BAS21-QR DataSheet
패키지 TO-236-3
재고3673

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사양

속성	가치
Supplier	Nexperia USA Inc.
Package / Case	Bulk
Series	Automotive, AEC-Q101
Part Status	Active
Diode Type	Schottky
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified(Io)	200mA (DC)
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA
Speed	Small Signal =< 200mA (Io), Any Speed
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V
Capacitance @ Vr F	5pF @ 0V, 1MHz
Mounting Type	Surface Mount
Supplier Device Package	TO-236AB

개요

Description

BAS21-QR is a variant of the BAS21 small-signal, fast-switching diode used for general-purpose switching and low-power rectification. The “QR” suffix usually denotes a specific manufacturer package/lot code, so exact form factor (often a compact SMD package) and electrical ratings vary by vendor—consult the datasheet for the QR version you’re using. Typical characteristics include a low forward voltage drop and fast switching (short reverse-recovery) to handle tens to a few hundred milliamperes and tens of volts, depending on the part. Common applications: switching regulators, demodulation, clipping/protection circuits, and RF or logic-level switching. Design notes: verify VR, IF, and reverse-recovery specs in the datasheet, account for temperature effects, and observe correct polarity and mounting. If you have a specific datasheet, I can pull out the exact ratings.

Equivalent

BAS21-QR is an NPN general‑purpose small‑signal transistor in SOT‑23. Common equivalents (SOT‑23 NPNs with similar ratings) include:
- MMBT3904 / MMBT3904LT1G
- MMBT4401
- BC847B (BC847BS) / BC846B
- 2N3904 (SMD variant: MMBT3904)
Verify Vce, Ic, and pinout for your footprint.

Features

BAS21-QR features (concise):
- NPN small-signal transistor in SOT-23 package (Pb-free, RoHS)
- QR variant indicates tape-and-reel packaging for automated assembly
- General-purpose switching and amplification device
- Voltage/current ratings (typical): Vceo ~ 60 V; Ic max ~ 100 mA
- High current gain (hFE) for small-signal use; suitable for RF and high-speed switching
- Ft (transition frequency) in the hundreds of MHz, enabling fast switching/amplification
- Suitable for a wide temperature range and common circuit applications
Note: exact electricals vary by manufacturer and lot; always consult the specific datasheet for BAS21-QR from your supplier.

Pinout

- Pin count: 3 pins
- Function: BAS21-QR is an NPN small‑signal transistor (general purpose) used for switching and amplification in SOT-23 packages.
- Common pinout (top view): Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector.

Manufacturer

- Manufacturer: Nexperia.
- What kind of company: A global semiconductor company that designs and manufactures discrete devices (diodes, transistors), logic, and protection components; originally part of Philips/NXP and now an independent firm.

Application

BAS21-QR is a surface‑mount general‑purpose NPN transistor (SOT‑23) in tape‑and‑reel packaging. Typical application areas:
- High‑speed switching and small‑signal amplification in digital/mixed‑signal circuits
- Level shifting and buffering between logic and analog stages
- Driving small loads (LEDs, signal lines) in compact PCB designs
- Timing and pulse circuits using RC networks
- General‑purpose transistor use in consumer electronics, instrumentation, and automotive interfaces
Note: QR indicates reel packaging for automated assembly.