規格
| 屬性 | 價值 |
| 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 |
概述
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.
- 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.
- 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.
- 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.
- 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.
- 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.
Package
BAS21-QR is a surface-mount diode in an SOT-23 (3-pin) package. It’s a small-signal fast switching diode for compact layouts.
