BAS521-QX

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BAS521-QX

DIODE GEN PURP 300V 250MA SOD523

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Specifications

Supplier Nexperia USA Inc.
Package Tape & Reel (TR)
Series Automotive, AEC-Q101
ProductStatus Active
DiodeType Standard
Voltage-DCReverse(Vr)(Max) 300 V
Current-AverageRectified(Io) 250mA (DC)
Voltage-Forward(Vf)(Max)@If 1.1 V @ 100 mA
Speed Fast Recovery =< 500ns, > 200mA (Io)
ReverseRecoveryTime(trr) 50 ns
Current-ReverseLeakage@Vr 150 nA @ 250 V
Capacitance@VrF 0.4pF @ 0V, 1MHz
MountingType Surface Mount
Package/Case SC-79, SOD-523
SupplierDevicePackage SOD-523

Overview

Description

BAS521-QX is a small-signal transistor in the BAS521 family, typically used for general-purpose switching and amplification in low-power electronics. It is a 3-pin device in a surface-mount SOT-23 package.
Key points:
- Type: NPN small-signal transistor (used as a switch or amplifier).
- Package: SOT-23, suitable for compact boards.
- Typical use: drive loads via a base resistor (base driven from input, emitter to reference, collector to load and supply).
- Characteristics: high current gain and fast switching for low-power applications; exact Ic, Vce, and hFE vary by variant—consult the datasheet for precise ratings.
- QX suffix: denotes a specific manufacturing variant/qualification within the BAS521 family. Check the datasheet for precise electrical specs and packaging details.
Common applications: signal conditioning, level shifting, driving small loads (LEDs, relays, sensors).
For precise numbers and pinout, refer to the manufacturer’s BAS521-QX datasheet.

Features

BAS521-QX is a small-signal NPN transistor in SOT-23. Typical features (vendor dependent; check datasheet for exact numbers):
- Type: NPN silicon transistor, general-purpose switching/amplification
- Package: SOT-23 (surface-mount)
- Vceo: ~45 V
- Ic: up to ~0.2 A
- DC current gain (hFE): broad, roughly 100–600 depending on Ic
- Vce(sat): ~0.2 V at low Ic (e.g., Ic ≈ 10 mA with suitable Ib)
- Ft (switching frequency): tens to hundreds of MHz
- Temperature range: -55°C to +125°C (industrial/automotive grades vary)
- RoHS-compliant; QX variant may indicate a specific packaging/qualification option (check the exact datasheet)
Note: Exact ratings and characteristics can vary by manufacturer and batch. Refer to the specific BAS521-QX datasheet for precise numbers.

Package

SOT-23 (3-pin) surface-mount package.

Pinout

- Pin count: 3 pins
- Function: NPN small-signal/general-purpose transistor in a SOT-23 package, used for switching and amplification.

Manufacturer

Manufacturer: Diodes Incorporated.
What kind of company: Diodes Incorporated is a global, publicly traded semiconductor company that designs and manufactures discrete, logic, analog and mixed‑signal ICs and discrete components for consumer, computing, communications, automotive and industrial markets.

Application

General-purpose small-signal transistor for switching and amplification. Applications include:
- Digital logic interfacing and level shifting
- Sensor signal conditioning and buffering
- Audio preamplification and small-signal stages
- Driving low-power loads (LEDs, relays, transistors)
- Bias networks and general switching in consumer, automotive, and industrial electronics

Equivalent

BAS521‑QX is a 60 V, small‑signal NPN transistor in SOT‑23. Common equivalents include: MMBT4401 and FMMT4401 (SOT‑23, 60 V), MMBT4401DW/PMB (Diodes Inc), 2N4401 (TO‑92 through‑hole), and Nexperia BCX53/BCX54 (60 V HV NPN). Always verify Vceo, Ic, hFE and package to ensure a true drop‑in.

Shipping

Shipping MethodsWe

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Shipping Fee Reference (DHL/FedEx):

DHL: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 2-5 business days.

FedEx: Shipping cost ranges from $25-$40 (0.5kg), with an estimated delivery time of 3-7 business days.

UPS: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 3-7 business days.

TNT: Shipping cost ranges from $25-$65 (0.5kg), with an estimated delivery time of 3-7 business days.

EMS: Shipping cost ranges from $30-$50 (0.5kg), with an estimated delivery time of 7-15 business days.

Registered Air Mail: Shipping cost is $2-$4 (0.1kg), with an estimated delivery time of 5-20 business days.

Payments

Payment Methods

The Payment term is 100% Prepaid.

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3. Wire Transfer

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