規格
| 屬性 | 價值 |
| Supplier | Nexperia USA Inc. |
| Package / Case | Bulk |
| Series | Automotive, AEC-Q101 |
| Part Status | Active |
| Diode Type | Standard |
| Voltage - DC Reverse (Vr) (Max) | 200 V |
| Current - Average Rectified(Io) | 250mA (DC) |
| Voltage - Forward (Vf) (Max) @ If | 1.25 V @ 200 mA |
| Speed | Fast Recovery =< 500ns, > 200mA (Io) |
| Reverse Recovery Time (trr) | 50 ns |
| Current - Reverse Leakage @ Vr | 100 nA @ 200 V |
| Capacitance @ Vr F | 2pF @ 0V, 1MHz |
| Mounting Type | Surface Mount |
| Supplier Device Package | SOD-323 |
概述
Description
Sorry, BAS321-QX isn't a widely recognized standard part without a manufacturer; could you share the datasheet or context? If you mean BAS321-series small-signal transistor, here is a quick intro: It's a surface-mount, typically NPN transistor used for switching and amplification in low-power circuits. In SOT-23 package, typical connections are E-B-C; key ratings include collector current, breakdown voltage, and gain; always consult the exact datasheet since 'QX' suffix denotes a device variant (lead-free, package, temp grade) that changes specs. How to use: bias the base with appropriate resistor to control collector load; ensure VCE rating and power dissipation are not exceeded. To tailor, share manufacturer or datasheet.
Equivalent
BAS321-QX is a general-purpose NPN small-signal transistor in SOT-23. Common cross-refs (SMD equivalents) include:
- MMBT3904 / MMBT3904LT1G
- BC847B (and BC847B-7, BC847B-25)
- PMBT3904 (Panasonic)
- KST3904 / NXP 2N3904LT1G
Always verify Vce, Ic and hFE to match BAS321-QX datasheet.
- MMBT3904 / MMBT3904LT1G
- BC847B (and BC847B-7, BC847B-25)
- PMBT3904 (Panasonic)
- KST3904 / NXP 2N3904LT1G
Always verify Vce, Ic and hFE to match BAS321-QX datasheet.
Features
BAS321-QX is a general‑purpose small-signal NPN transistor in a SOT‑23 package. Key features:
- NPN, silicon small-signal transistor
- Package: SOT‑23 (surface mount)
- Vceo: ~60 V
- Ic max: ~100 mA
- High current gain: hFE broadly ~100–600 depending on Ic
- Low leakage (Ices in the nA range under typical conditions)
- Fast switching characteristics suitable for switching/ amplification
- Pb‑free / RoHS compliant
- Often used for general switching and amplification in compact designs
Note: exact values can vary by lot and by the QX variant; refer to the manufacturer datasheet for precise specifications and tolerances.
- NPN, silicon small-signal transistor
- Package: SOT‑23 (surface mount)
- Vceo: ~60 V
- Ic max: ~100 mA
- High current gain: hFE broadly ~100–600 depending on Ic
- Low leakage (Ices in the nA range under typical conditions)
- Fast switching characteristics suitable for switching/ amplification
- Pb‑free / RoHS compliant
- Often used for general switching and amplification in compact designs
Note: exact values can vary by lot and by the QX variant; refer to the manufacturer datasheet for precise specifications and tolerances.
Pinout
- Pin count: 3 pins (SOT-23 package)
- Function: BAS321-QX is a small-signal NPN transistor for general-purpose switching and amplification (pinout typically 1=Emitter, 2=Base, 3=Collector when the flat face is toward you).
- Function: BAS321-QX is a small-signal NPN transistor for general-purpose switching and amplification (pinout typically 1=Emitter, 2=Base, 3=Collector when the flat face is toward you).
Manufacturer
- Manufacturer: Nexperia (formerly Philips/NXP).
- What kind of company: A global semiconductor company specializing in standard discretes (diodes, transistors, MOSFETs), as well as ESD protection devices and related components for automotive, industrial, and consumer electronics.
- What kind of company: A global semiconductor company specializing in standard discretes (diodes, transistors, MOSFETs), as well as ESD protection devices and related components for automotive, industrial, and consumer electronics.
Application
BAS321‑QX is a small‑signal fast Schottky diode (SMD). Typical application areas:
- Fast, low‑VF rectification in switch‑mode power supplies and DC‑DC converters
- Reverse‑polarity and spike protection for power rails and logic I/O
- RF front‑end circuits (envelope detectors, detectors, mixers) requiring fast recovery
- Level shifting and pulse rectification in digital/timing networks
- OR‑ing and protection diodes in portable electronics and similar devices
- General protection/ clamping and peak‑current paths in small‑signal circuitry
- Fast, low‑VF rectification in switch‑mode power supplies and DC‑DC converters
- Reverse‑polarity and spike protection for power rails and logic I/O
- RF front‑end circuits (envelope detectors, detectors, mixers) requiring fast recovery
- Level shifting and pulse rectification in digital/timing networks
- OR‑ing and protection diodes in portable electronics and similar devices
- General protection/ clamping and peak‑current paths in small‑signal circuitry
Package
BAS321-QX is a small-signal NPN transistor in a SOT-23 (3-pin) surface-mount package.
