STBV45-AP - 400V NPN High-Voltage Fast-Switch Transistor | STMicroelectronics
N.º da peça: STBV45-AP ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.4 | $0,40 |
| 10 | $0.34 | $3,40 |
| 100 | $0.26 | $26,00 |
| 500 | $0.2 | $100,00 |
| 1.000 | $0.16 | $160,00 |
STBV45-AP Visão geral
A bipolar junction transistor (BJT) is a three-terminal semiconductor device formed by two PN junctions that operates by injecting minority carriers across a base region to control a much larger collector current. NPN BJTs like the STBV45-AP are particularly suited to high-voltage, fast-switching roles because the multi-epitaxial planar process supports high breakdown voltages while maintaining short carrier transit times. Within the broader component taxonomy, the STBV45-AP is a discrete semiconductor -> transistor -> bipolar transistor (BJT) -> NPN power transistor, serving power conversion and switch-mode sub-systems rather than small-signal amplification.
Key features of the STBV45-AP include a 400 V VCEO rating, 0.75 A continuous collector current, very high switching speed enabled by the cellular emitter, low lot-to-lot dynamic parameter spread, minimum dynamic parameter spread for predictable paralleling or sequencing, a wide Reverse Bias Safe Operating Area for inductive load commutation, and the planar edge termination that improves voltage stability at the silicon surface. The TO-92AP (Ammopack) radial lead package supports automated axial-style insertion or hand soldering in compact lighting and charger modules.
The device is built using high-voltage multi-epitaxial planar technology for high switching speeds and high voltage capability, and uses a cellular emitter structure with planar edge termination to enhance switching speeds while maintaining the wide RBSOA. This combination makes the part attractive for switch-mode power topologies where predictable turn-off behaviour under inductive loads is critical.
Typical applications include compact fluorescent lamps (CFLs), SMPS (switch-mode power supply) for battery chargers, electronic ballasts, high-voltage DC-DC converters, and inductive heating driver stages. It is also commonly used in flyback and forward converters, line-powered switching regulators, and any circuit that requires switching 200-400 V rails with a low-cost discrete BJT.
When designing with the STBV45-AP, attention must be paid to safe operating area under reverse-bias conditions, to base-drive turn-off speed, and to thermal management through the TO-92 leads since the package does not have a heatsink tab. A sufficiently large snubber or clamp network is recommended when switching inductive loads near the VCEO limit.
This page synthesizes distributor pricing, drop-in alternatives from the same family, and practical design notes for high-voltage BJT switching not found in the manufacturer datasheet alone.
Alternativas drop-in para STBV45-AP — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com STBV45-AP (mesmo formato e footprint) — diferindo em Continuous Collector Current (IC), Mounting Type, Package, Technology.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
STBV45
✅ Drop-In✓ Em estoque
$0.31 / unidade
Ver ficha técnica →STBV45G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
STBV45G-AP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MPSA44
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MPSA45
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
STBV45-AP Classificações máximas e características elétricas
| Tipo de transistor | NPN Bipolar Junction Transistor (BJT) |
| Technology | High-voltage multi-epitaxial planar, cellular emitter |
| Tensão coletor-emissor (Vceo) | 400 V |
| Continuous Collector Current (IC) | 0.75 A |
| Switching Speed | Very high (fast-switching grade) |
| Reverse Bias SOA | Wide RBSOA per datasheet |
| Encapsulamento | TO-92AP (Ammopack, radial leads) |
| Tipo de montagem | Through-Hole (Ammopack tape) |
| Status RoHS | Compliant |
Configuração de pinos do STBV45-AP
| Pino 1 | Emitter (E) — Emitter terminal, connected to the low-side return |
| Pino 2 | Base (B) — Base terminal, receives the drive current |
| Pino 3 | Collector (C) — Collector terminal, switches the high-voltage load |
Área de Operação Segura (DC)
Aplicações típicas
STBV45-AP é adequado para 6 aplicaçãos: Compact Fluorescent Lamp (CFL) Ballast, SMPS for Battery Charger (Flyback Topology), Electronic Ballast for Fluorescent Tubes, High-Voltage DC-DC Converter, Inductive Heating Driver Stage, Line-Powered Switching Regulator.
Compact Fluorescent Lamp (CFL) Ballast
The STBV45-AP is explicitly designed for compact fluorescent lamp ballasts per the manufacturer datasheet, where it switches the rectified mains rail at low-to-medium frequency to drive the lamp's resonant LC network. Its 400 V VCEO comfortably exceeds the peak rectified 230 V mains voltage with margin for transient overshoot, while the cellular emitter structure delivers the very high switching speed required for clean lamp ignition and stable glow-mode operation. The wide Reverse Bias Safe Operating Area (RBSOA) handles the inductive kick from the ballast inductor at turn-off without secondary breakdown, which is critical for ballast longevity. At 0.75 A continuous collector current, the part covers the typical 5-15 W CFL ballast current range. Compared to a general-purpose high-voltage NPN like the MPSA44, the STBV45-AP offers tighter dynamic parameter spread for production consistency across millions of ballast units.
Recomendado
SMPS for Battery Charger (Flyback Topology)
The STBV45-AP is listed for SMPS battery charger applications where a flyback converter operates directly from rectified mains. Its 400 V VCEO tolerates the reflected primary voltage plus leakage inductance spike, and the very high switching speed enables operation at frequencies that shrink the transformer core. At 0.75 A, the part covers charger power levels up to roughly 30 W before moving to a higher-current BJT or MOSFET. The planar edge termination improves voltage stability at the silicon surface during the high dV/dt events that occur at flyback turn-off, and the low dynamic parameter spread keeps the RCD snubber design stable unit-to-unit. Designers typically pair the STBV45-AP with a TL431 secondary-side reference and an opto-isolated feedback path for isolated charger designs.
Recomendado
Electronic Ballast for Fluorescent Tubes
Beyond CFLs, the STBV45-AP supports linear fluorescent tube electronic ballasts where the BJT drives the resonant LC tank to ignite and sustain the arc. The wide RBSOA is essential when commutating the highly inductive ballast chokes, and the 400 V rating tolerates the open-circuit lamp voltage before ignition. Cellular emitter construction keeps storage time short, reducing cross-conduction losses when used in a half-bridge ballast configuration (two STBV45-AP devices per ballast). The TO-92AP Ammopack format suits high-volume automated insertion lines typical of ballast manufacturing. Compared to a MOSFET solution, the BJT ballast using STBV45-AP achieves lower BOM cost at the modest switching frequencies used in residential lighting ballasts.
Recomendado
High-Voltage DC-DC Converter
In high-voltage DC-DC converter modules that step down from a 200-400 V bus to lower logic or analog rails, the STBV45-AP serves as the primary-side switching element in buck or flyback configurations. The 400 V VCEO provides adequate margin for the worst-case bus voltage plus inductive ringing, while the 0.75 A rating suits auxiliary and bias-supply converters up to roughly 20-30 W output. The fast-switching capability minimizes switching losses, and the tight hFE distribution across lots reduces the base-drive design margin required. Where higher power or efficiency is needed, designers often migrate to a MOSFET alternative such as the STF4N80, but the STBV45-AP retains the BOM-cost advantage at lower power levels.
Recomendado
Inductive Heating Driver Stage
Low-power inductive heating cooktop and water-heater driver boards use the STBV45-AP in resonant half-bridge or push-pull stages operating at 20-50 kHz. The cellular emitter process keeps switching losses low at these frequencies, and the wide RBSOA handles the turn-off of highly inductive heating coils without secondary breakdown. The 400 V VCEO supports rectified mains input directly, eliminating the need for a step-down transformer in some appliance designs. At 0.75 A continuous, the device suits single-burner low-power induction modules; higher-power designs require paralleling or migrating to a higher-current BJT or IGBT.
Recomendado
Line-Powered Switching Regulator
The STBV45-AP fits isolated and non-isolated switching regulators that operate directly from 110/230 V AC mains after rectification, in industrial control and appliance subsystems. Its 400 V rating provides the necessary safety margin against line transients and surge events, while the fast-switching cellular emitter enables efficient operation across the 20-100 kHz range typical of these regulators. The 0.75 A current rating suits bias-supply and small-sensor-power rails inside larger equipment. Compared to discrete MOSFET solutions at this voltage and current class, the STBV45-AP delivers a lower unit cost and simpler drive (no gate-charge concerns), at the expense of continuous base-current draw.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para STBV45-AP — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | STBV45 | STBV45G | STBV45G-AP | MPSA44 | MPSA45 |
|---|---|---|---|---|---|---|
| Package | TO-92AP (Ammopack) | TO-92 (Bulk) | TO-92 (Bulk) | TO-92AP (Ammopack) | TO-92 | TO-92 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | onsemi | onsemi |
| Transistor Type | NPN BJT | NPN BJT | NPN BJT | NPN BJT | NPN BJT | NPN BJT |
| VCEO (V) | 400 V | 400 V | 400 V | 400 V | 400 V | 350 V |
| Continuous IC (A) | 0.75 A | 0.75 A | 0.75 A | 0.75 A | 0.3 A | 0.3 A |
| Target Application | CFL / SMPS charger (fast-switch optimized) | CFL / SMPS charger (fast-switch optimized) | CFL / SMPS charger (halogen-free) | CFL / SMPS charger (halogen-free ammo) | General-purpose high-voltage | General-purpose high-voltage |
| Packaging Format | Ammopack (tape) | Bulk | Bulk | Ammopack (tape) | Bulk (Ammo on some SKUs) | Bulk (Ammo on some SKUs) |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Principais diferenciais
- Wide Reverse Bias Safe Operating Area (RBSOA) for inductive switching (vs MPSA44)
- Higher continuous collector current than competing 400 V TO-92 NPNs (vs MPSA44)
- Cellular emitter structure for low dynamic parameter spread (vs MPSA44)
Notas de projeto
Estimated: the TO-92 package of the STBV45-AP dissipates power primarily through its three leads rather than a dedicated heatsink tab. At a continuous 0.75 A collector current with VCE near the operating point (e.g., 5 V), dissipation approaches ~3.75 W. Without additional copper area or airflow, junction temperature can exceed safe limits in confined enclosures. Provide at least 100 cm^2 of copper on the PCB around the leads, or use a small clip-on heatsink, when operating above 1 W continuous dissipation.
Confirm the TO-92 pinout orientation against the manufacturer datasheet before PCB layout, because different NPN transistors use different E-B-C assignments. The STBV45-AP follows the standard ST lead assignment (Emitter left, Base middle, Collector right when viewed from the flat side with leads down). Reversing base and collector connections typically results in the device operating with very low gain or simply not switching, and connecting collector to the low side instead of the high side creates a short-circuit condition at turn-on.
For high-voltage switching applications (CFL, SMPS charger), keep the STBV45-AP away from low-voltage analog traces to minimize capacitive coupling of the dV/dt edge. Provide a tight base-drive loop with the base resistor placed close to the base pin, and route the collector trace with adequate clearance (typically 2-3 mm minimum at 400 V per IPC-2221). Place the RCD snubber or clamp components physically close to the collector pin to limit ringing and reduce EMI.
Informações de conformidade
RoHS and lead-free compliant per ST product page. Standard molding compound is not halogen-free; use the STBV45G or STBV45G-AP variant for halogen-free builds. AEC-Q100 not applicable - this is a through-hole discrete BJT intended for consumer/industrial lighting and SMPS charger applications, not automotive.
