BCX51-16,115 - 45V 1A PNP Medium Power BJT | Nexperia
부품 번호: BCX51-16,115 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.24 | $24.00 |
| 500 | $0.19 | $95.00 |
| 1,000 | $0.16 | $160.00 |
| 3,000 | $0.13 | $390.00 |
BCX51-16,115 개요
A PNP bipolar junction transistor (BJT) is a three-terminal, current-controlled device in which a small base current modulates a larger collector current flowing from emitter to collector. PNP transistors sit in the same family hierarchy as NPN BJTs, transistors, and discrete semiconductors, and are commonly used as low-side switches or complementary half-bridge partners to NPN parts such as the BCX54 series. BJTs remain widely deployed where predictable gain, low saturation voltage, and robustness to large current transients matter more than the power-conversion efficiency of MOSFETs.
Key differentiating features of the BCX51-16 are its high hFE (100 minimum at the -16 selection), high transition frequency (fT = 145 MHz typical) for the medium-power class, integrated SOT-89 thermal pad enabling up to 1.3 W dissipation, and a -16 hFE grade for tighter gain binning. The exposed copper tab on the package's 3-lead SOT-89 footprint provides a low thermal resistance path, simplifying PCB thermal design versus smaller packages such as SOT-23.
Architecturally the BCX51-16 uses an epitaxial planar PNP structure, with hFE specified in narrow bins (-10, -16) so that circuits can be designed around a known minimum gain. The 145 MHz transition frequency, combined with 1 A continuous Ic and 45 V VCEO, makes the part well suited to driver stages, linear regulators, and high-side PMOS companions. Compared with general-purpose 200 mA small-signal BJTs, the BCX51-16 extends usable operation into the 1 A range while keeping the SOT-89 outline.
Typical applications include load switching in 12 V to 24 V systems, medium-power LED drivers, voltage regulator pass elements, audio pre-amplifier and output stages, MOSFET gate driver buffers, and complementary output stages with BCX54 NPN partners. The automotive-grade version, BCX51-16-QF, extends these uses into AEC-Q100 qualified modules.
When designing with the BCX51-16, always compute worst-case power dissipation (VCE x IC + VBE x IB) and confirm the resulting junction temperature using the SOT-89 thermal resistance. SOT-89 has limited copper area on the tab; at 1.3 W continuous, a thermal relief copper pour is strongly recommended to stay within the 150 C junction rating.
This page synthesizes current distributor pricing, drop-in SOT-89 alternatives, and practical PCB thermal design notes not found on a single datasheet or distributor listing, helping engineers select and qualify the BCX51-16,115 faster.
드롭인 대체품: BCX51-16,115 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
BCX51-16,135
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
BCX51-16-QF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
BCX52-16,115
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
BCX53-16,115
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
2SA1364
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
BCX51-16,115 최대 정격 & 전기적 특성
| 트랜지스터 유형 | PNP Bipolar (BJT) |
| 패키지 | SOT-89 (SC-62) |
| Collector-Emitter Voltage (VCEO) Max | 45 V |
| Continuous Collector Current (IC) Max | 1 A |
| Total Power Dissipation (Ptot) | 1.3 W |
| 전이 주파수 (ft) | 145 MHz |
| DC 전류 이득 (hFE) 최소 | 100 @ IC = 150 mA, VCE = 2 V (-16 grade) |
| 동작 접합 온도 | -65 C to +150 C |
| 실장 유형 | Surface Mount |
| 핀 수 | 3 + Tab (4 pins total) |
| Gain Group | -16 (hFE 100-250 at 150 mA / 2 V) |
| Complementary NPN Part | BCX54 series (e.g., BCX54-16) |
| RoHS 상태 | Compliant |
| MSL 레벨 | 1 (per Nexperia product page) |
BCX51-16,115 핀 구성
| 핀 1 | Emitter — PNP emitter - source of majority carriers |
| 핀 2 | Collector — PNP collector - main current carrying terminal, bonded to thermal tab |
| 핀 3 | Base — PNP base - control terminal; pull toward ground to turn on |
| 핀 TAB | Collector (thermal tab) — Internally connected to pin 2 (collector); provides thermal dissipation path for the SOT-89 package |
일반적인 애플리케이션
BCX51-16,115 적합 용도: 6 애플리케이션s: 24 V Industrial Load Switch, Medium-Current LED Driver, MOSFET Gate Driver Buffer, Linear Voltage Regulator Pass Element, Audio Pre-Amplifier and Output Stage, Automotive Switching Module (AEC-Q100 version).
24 V Industrial Load Switch
The BCX51-16,115's PNP topology, 1 A continuous collector current, and 45 V VCEO make it a strong fit for low-side switching of 24 V industrial relays, solenoids, and indicator lamps below 1 W. With hFE 100 minimum, only ~5 mA base current is needed to fully saturate at 500 mA load, allowing direct drive from a 3.3 V or 5 V GPIO through a base resistor. Unlike a P-channel MOSFET, no charge pump is required to turn the part on - a base pull-down is sufficient. Place the device between the load and ground so the BCX51-16 sees the full 24 V across VCE during cutoff, comfortably below the 45 V rating.
추천
Medium-Current LED Driver
The BCX51-16,115 functions as a linear current regulator for 350 mA to 1 A LED strings on 12 V or 24 V supplies. Placing a small sense resistor in the emitter path creates a closed-loop current source: as LED current rises, VBE drops, biasing the BJT toward cutoff - a textbook analog regulator. The 1.3 W power rating handles a 350 mA load on a 24 V rail with adequate thermal margin when the SOT-89 tab is soldered to >=1 sq cm of copper. Compared with a dedicated LED driver IC, the BCX51-16 is lower cost at the expense of accuracy, making it best for non-precision lighting such as signage and indicator strips.
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MOSFET Gate Driver Buffer
When a microcontroller GPIO cannot source or sink the peak gate current needed by a power MOSFET, the BCX51-16,115 provides a discrete buffer stage. Its 145 MHz transition frequency keeps gate-charge rise and fall times in tens of nanoseconds for typical logic-level MOSFETs below 50 nC Qg, and the 1 A collector rating drives heavy gate-charge loads through push-pull configuration with a BCX54 NPN partner. Inverter-style designs with BCX51-16 (PNP) pulling high and BCX54 (NPN) pulling low deliver clean, fast gate transitions without the cost of a dedicated gate-driver IC.
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Linear Voltage Regulator Pass Element
Used as the pass transistor in a discrete linear regulator, the BCX51-16,115 maintains a constant output with VCE acting as the controlled element. Its -16 grade guarantees hFE >= 100, simplifying the error-amplifier feedback loop and ensuring adequate base drive at 1 A. The 45 V VCEO supports input rails up to about 30 V after derating, covering legacy 24 V industrial systems. Designers often pair it with a TL431 reference and a BCX54 NPN current limiter, achieving a low-cost, repairable regulator footprint using all SOT-89 discrete parts.
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Audio Pre-Amplifier and Output Stage
The 145 MHz fT and the -16 hFE bin let the BCX51-16,115 handle small-signal audio amplification up to several hundred mW. In complementary output stages matched with a BCX54-16 NPN partner, the pair forms a Class-AB push-pull output delivering good linearity for headphones or low-power speakers. PNP polarity suits the negative half-cycle conduction, while matching gain bins minimize crossover distortion. The SOT-89 footprint, with its thermal tab, sustains the moderate dissipation of an audio output stage far better than SOT-23 alternatives.
추천
Automotive Switching Module (AEC-Q100 version)
The BCX51-16-QF (same die and SOT-89 package, AEC-Q100 qualified) extends the BCX51-16,115 into automotive electronics such as body control modules, lighting controllers, and HVAC actuators. Its -16 gain bin and 1 A capability handle coil and lamp loads across the 12 V automotive supply with cold-crank and load-dump transients. Same footprint as the standard part enables PCB reuse between commercial and automotive SKUs with only a BOM change. For sub-12 V rails, the standard BCX51-16,115 is sufficient; for warranty-bound automotive designs, the QF grade is required.
추천
추천 제품 요약
엔지니어링 참조 데이터: BCX51-16,115 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | BCX51-16,135 | BCX51-16-QF | BCX52-16,115 | BCX53-16,115 | 2SA1364 |
|---|---|---|---|---|---|---|
| Brand | Nexperia | Nexperia | Nexperia | Nexperia | Nexperia | onsemi |
| Package | SOT-89 (SC-62) | SOT-89 (SC-62) - same | SOT-89 (SC-62) - same | SOT-89 (SC-62) - same | SOT-89 (SC-62) - same | SOT-89 (SC-62) - same |
| Transistor Type / Polarity | PNP BJT | PNP BJT | PNP BJT | PNP BJT | PNP BJT | PNP BJT |
| VCEO Max | 45 V | 45 V | 45 V | 60 V | 80 V | 45 V |
| Continuous IC Max | 1 A | 1 A | 1 A | 1 A | 1 A | 1 A |
| Power Dissipation Ptot | 1.3 W | 1.3 W | 1.3 W | 1.3 W | 1.3 W | 1.3 W |
| AEC-Q100 Automotive Grade | No | No | Yes | No | No | No |
주요 차별점
- Tighter hFE bin (100-250) than the un-binned BCX51 (vs BCX51,115 (hFE 63-250))
- Automotive-grade option in same package and pinout (vs BCX51-16-QF)
- Higher VCEO siblings available in identical footprint (vs BCX53-16,115)
설계 노트
Estimated: at 1.3 W continuous dissipation the SOT-89 thermal resistance (about 50 C/W per the Nexperia BCX51-16 datasheet with the recommended footprint) gives a 65 C junction rise above 25 C ambient. Keep absolute Tj below 150 C by enlarging the copper pad under the collector tab to at least 2 square centimeters with thermal vias to the opposite plane. At lower loads the same footprint works without extra copper, but continuous 1 A switching at full VCEO can push the junction to its thermal limit quickly.
Solder the SOT-89 metal tab on the underside to the copper pour; this tab is internally bonded to pin 2 (collector). Use at least 4 thermal vias under the tab to spread heat into an inner or bottom copper plane. Avoid running sensitive analog signal traces directly under the device - the tab is electrically hot and can inject switching noise through stray capacitance.
Do not confuse SOT-89 pinouts across manufacturers. The BCX51-16 follows the Nexperia convention of E-C-B on pins 1-2-3, but some vendors' SOT-89 parts place the collector on pin 1. Always check the datasheet's pinout diagram before committing the footprint. Also, ensure the base is never allowed to float - an undriven PNP base in a 24 V system can cross-conduct due to leakage, causing parasitic turn-on at high temperatures.
규정 준수 정보
BCX51-16,115 is RoHS compliant and lead-free per the Nexperia product page; the -QF suffix designates the AEC-Q100 automotive variant. Standard -115 tape is for 1,000-piece reels.
