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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

NXP Semiconductors BST15,115

Name: BST15,115
Brand: NXP Semiconductors
SKU: BST15,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BST15,115

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BST15,115.pdf

Description:: TRANS PNP 200V 0.2A SOT-89-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BST15,115 from Nexperia (formerly Philips Semiconductors) is a PNP high-voltage bipolar junction transistor in SOT89 package, rated for −200 V V_CEO, −200 V V_CBO, and −200 mA I_C, with DC current gain h_FE of 30–150 at −50 mA/−10 V, used in high-voltage switching circuits such as CRT flyback drivers and industrial power supply control stages.

For engineers reviewing the BST15,115 datasheet, BST15,115 pinout, BST15,115 application, or BST15,115 equivalent, key selection considerations include its −200 V blocking capability, SOT89 thermal performance (R_th(j-a) = 95 K/W), low leakage (ICBO ≤ −100 nA at −175 V), and compatibility with NPN complement BST39 in push-pull configurations.

Technical Context

This PNP transistor operates in linear amplification and saturated switching modes, with verified V_CE(sat) ≤ 750 mV at −50 mA/−5 mA drive and f_T ≥ 15 MHz, enabling use in medium-frequency switching up to several hundred kHz. Its SOT89 package features an exposed collector pad optimized for thermal conduction on PCBs with ≥6 cm² copper area.

Designed for high-voltage isolation, it meets IEC 60134 Absolute Maximum Rating System limits, with T_j max = 150 °C and storage temperature range −65 to +150 °C - validated under standard mounting conditions per Philips Handbook thermal guidelines.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−200 V - maximum collector-emitter voltage with base open; defines safe operating voltage in switching applications like flyback snubbers.
I_C	−200 mA - continuous DC collector current; sets upper bound for load-driving capability in relay drivers or HV logic interfaces.
h_FE	30–150 - DC current gain at −50 mA/−10 V; determines required base drive for reliable saturation in power control stages.
V_CE(sat)	≤ 750 mV - collector-emitter saturation voltage at −50 mA/−5 mA; directly impacts conduction loss and thermal rise in switching mode.
f_T	≥ 15 MHz - transition frequency at −10 mA/−10 V; supports stable operation in medium-speed switching up to ~200 kHz.
R_th(j-a)	95 K/W - thermal resistance junction-to-ambient on standard PCB; requires ≥6 cm² copper pad for full 1.3 W power dissipation.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package with exposed collector pad for enhanced thermal transfer; 3-lead configuration, standardized footprint per JEDEC TO-243 and IEC outline.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to most positive rail in PNP high-side switch configurations.
2	Collector	Main current-carrying terminal with exposed pad; must be soldered to ≥6 cm² copper for rated power handling.
3	Base	Control input; negative bias relative to emitter required to turn device ON (active or saturated).

Key Features

Feature	Design Value
High-voltage blocking	Rated −200 V V_CEO enables direct interface with 170 V RMS line-derived supplies or CRT anode circuits.
Low leakage current	ICBO ≤ −100 nA at −175 V ensures minimal standby power loss in always-on HV bias networks.
SOT89 thermal design	Exposed collector pad and R_th(j-s) = 15 K/W allow efficient heat transfer to PCB without heatsinks in <1 W applications.
Complementary pairing	Validated NPN counterpart BST39 supports matched push-pull designs with consistent gain and timing behavior.

Applications

Industrial Power Supply Control	CRT Display Flyback Driver
Use Scenario: Regulating auxiliary HV rails in offline SMPS using discrete transistor-based feedback or gate drive circuits. IC Role / Device Role / Timing Role: PNP high-side switch controlling optocoupler bias or TL431 reference current path. Use Value: −200 V rating avoids cascaded level-shifting; SOT89 thermal performance sustains 1.3 W dissipation during transient overloads.	Use Scenario: Driving horizontal deflection output stage and flyback transformer primary in analog CRT monitors. IC Role / Device Role / Timing Role: High-voltage switching transistor in quasi-resonant or fixed-frequency flyback topology. Use Value: Verified f_T ≥ 15 MHz and low C_c (≤15 pF) support clean switching edges and reduced EMI in 15–30 kHz flyback operation.
Relay and Solenoid Driver	High-Voltage Logic Interface
Use Scenario: Controlling 24–48 V industrial relays or pneumatic solenoids requiring isolated, high-current switching. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to inductive loads via base resistor network. Use Value: V_CE(sat) ≤ 750 mV minimizes power loss and self-heating during sustained ON periods; h_FE range ensures robust drive margin.	Use Scenario: Level translation between 3.3/5 V logic and −100 to −200 V signal paths in test equipment or HV sensor conditioning. IC Role / Device Role / Timing Role: Inverting high-voltage buffer with defined gain and cutoff thresholds. Use Value: Tight V_EBO = −4 V and low IEBO ≤ −100 nA preserve logic integrity while blocking reverse leakage in bidirectional bias networks.

Industrial Power Supply Control

CRT Display Flyback Driver

Use Scenario: Regulating auxiliary HV rails in offline SMPS using discrete transistor-based feedback or gate drive circuits.

IC Role / Device Role / Timing Role: PNP high-side switch controlling optocoupler bias or TL431 reference current path.

Use Value: −200 V rating avoids cascaded level-shifting; SOT89 thermal performance sustains 1.3 W dissipation during transient overloads.

Use Scenario: Driving horizontal deflection output stage and flyback transformer primary in analog CRT monitors.

IC Role / Device Role / Timing Role: High-voltage switching transistor in quasi-resonant or fixed-frequency flyback topology.

Use Value: Verified f_T ≥ 15 MHz and low C_c (≤15 pF) support clean switching edges and reduced EMI in 15–30 kHz flyback operation.

Relay and Solenoid Driver

High-Voltage Logic Interface

Use Scenario: Controlling 24–48 V industrial relays or pneumatic solenoids requiring isolated, high-current switching.

IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to inductive loads via base resistor network.

Use Value: V_CE(sat) ≤ 750 mV minimizes power loss and self-heating during sustained ON periods; h_FE range ensures robust drive margin.

Use Scenario: Level translation between 3.3/5 V logic and −100 to −200 V signal paths in test equipment or HV sensor conditioning.

IC Role / Device Role / Timing Role: Inverting high-voltage buffer with defined gain and cutoff thresholds.

Use Value: Tight V_EBO = −4 V and low IEBO ≤ −100 nA preserve logic integrity while blocking reverse leakage in bidirectional bias networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT2907A	Lower V_CEO (−60 V), higher I_C (−600 mA), SOT23 package; no exposed thermal pad.	Not suitable for >−60 V circuits; limited thermal capacity prevents use in >0.3 W continuous dissipation.	Select only for low-voltage, space-constrained logic-level switching where thermal load is minimal.
BC807-40	V_CEO = −45 V, h_FE = 250–630, SOT23; significantly lower voltage rating and higher gain.	Cannot replace BST15,115 in any −100 V+ application; unsuitable for flyback or industrial HV control.	Use only in general-purpose low-voltage amplification or switching where voltage stress remains below −40 V.

Compared with MMBT2907A and BC807-40, BST15,115 delivers unique −200 V capability and SOT89 thermal robustness - making it irreplaceable in CRT, HV power supply, and industrial relay driver designs where both voltage headroom and power dissipation matter.

Availability

BST15,115 is available at Aetrix Electronics and suitable for industrial power supply control, CRT display flyback drivers, relay/solenoid drivers, and high-voltage logic interfaces requiring stable component supply across long-lifecycle embedded programs.

Supply support for BST15,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions - spun off from Philips Semiconductors in 2017 with full IP and manufacturing continuity.

The BST15,115 belongs to Nexperia's legacy high-voltage bipolar transistor family, engineered specifically for industrial and display applications demanding robust −200 V PNP switching with proven thermal reliability in SOT89 packaging.

FAQ

What is the maximum collector-emitter voltage rating for BST15,115?

The BST15,115 has a maximum collector-emitter voltage (V_CEO) rating of −200 V with base open, as confirmed in the Philips/Nexperia datasheet limiting values table. This rating is validated under standard mounting conditions (6 cm² copper pad) and defines the absolute upper limit for safe DC or peak repetitive voltage across the collector and emitter terminals in BST15,115 applications.

Is BST15,115 pin-compatible with BST16?

No, BST15,115 and BST16 share identical SOT89 pinout (emitter-collector-base on pins 1–2–3) and mechanical footprint, but they are not functionally interchangeable due to differing voltage ratings: BST15,115 is rated for −200 V V_CEO, while BST16 supports −300 V. Substituting BST15,115 for BST16 in −250 V circuits risks premature breakdown; always verify voltage stress margins before replacement.

What is the typical DC current gain (h_FE) of BST15,115 at operating conditions?

The BST15,115 exhibits a DC current gain (h_FE) ranging from 30 to 150 when tested at −50 mA collector current and −10 V collector-emitter voltage, per the official datasheet characteristics table. This gain window allows predictable base drive design for saturation in switching applications, though actual circuit gain depends on operating point, temperature, and PCB layout parasitics affecting BST15,115 performance.

Does BST15,115 have an exposed thermal pad, and how should it be mounted?

Yes, BST15,115 in SOT89 package features an exposed collector pad (pin 2) designed for direct thermal conduction to the PCB. For rated 1.3 W power dissipation, it must be mounted on a single-sided, tin-plated copper area of at least 6 cm², as specified in the thermal characteristics section of the BST15,115 datasheet - smaller pads increase R_th(j-a) and risk thermal runaway.

What NPN transistor is the designated complement to BST15,115?

The BST39 is the officially designated NPN complement to BST15,115, as stated in the Philips/Nexperia datasheet marking and applications section. Both devices share matching voltage ratings (BST39: 200 V V_CEO), gain ranges, and SOT89 packaging - enabling balanced push-pull, differential, or totem-pole configurations where complementary high-voltage switching is required using BST15,115 and BST39 together.

BST15,115 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 200 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 50mA, 10V

Power - Max:: 1.3 W

Frequency - Transition:: 15MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

BST15,115 FAQ

1.How can I place an order for BST15,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BST15,115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BST15,115 reliable?

The price and inventory of BST15,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BST15,115 is usually 5 days.

3.What payment methods are accepted for BST15,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BST15,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BST15,115?

BST15,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BST15,115 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BST15,115?

For technical support, including BST15,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BST15,115 requirements.

6.How does Aetrix verify that BST15,115 is sourced from the original manufacturer or authorized distributors?

All BST15,115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BST15,115 meets industry standards.

7.What is the process for return or replacement of BST15,115?

All BST15,115 units undergo pre-shipment inspection (PSI). If there is an issue with BST15,115, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BST15,115 part is unused and in its original packaging.

Return procedure for BST15,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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