Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. BSR43,115

Name: BSR43,115
Brand: Nexperia USA Inc.
SKU: BSR43,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BSR43,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BSR43,115.pdf

Description:: TRANS NPN 80V 1A SOT-89

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,480

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BSR43,115 from Nexperia is an NPN medium-power bipolar junction transistor in SOT89 package, rated for 80 V V_CEO, 1 A continuous collector current, and 1.35 W power dissipation at 25 °C ambient. It serves as a linear regulator pass element, low-side switch, or MOSFET driver in battery-powered industrial and consumer systems.

For engineers reviewing the BSR43,115 datasheet, BSR43,115 pinout, BSR43,115 application, or BSR43,115 equivalent, this page delivers verified electrical parameters, thermal resistance (R_th(j-a) = 93 K/W), DC current gain (h_FE = 100–300 at I_C = 100 mA), saturation voltages, and switching times - all critical for discrete power stage design and thermal margining.

Technical Context

The BSR43,115 operates as a silicon NPN transistor with base-controlled current amplification, optimized for medium-power linear and switching applications. Its 80 V V_CEO rating supports operation in 48 V and 36 V bus systems, while its 2 A peak collector current (I_CM) enables short-duration surge handling in power management circuits.

Thermal performance is defined by R_th(j-sp) = 13 K/W to solder point and R_th(j-a) = 93 K/W on FR4 PCB, confirming suitability for thermally constrained SMT layouts. The device exhibits f_T = 100 MHz and switching times of t_on = 250 ns / t_off = 1 µs under standard test conditions, supporting moderate-speed switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in linear regulators and switches.
I_C	1 A continuous - Rated DC collector current; sets maximum steady-state load drive capability.
h_FE	100–300 at I_C = 100 mA - DC current gain range; determines required base drive for target collector current.
V_CE(sat)	≤ 500 mV at I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss in switching applications.
R_th(j-a)	93 K/W - Junction-to-ambient thermal resistance on FR4 PCB; used to calculate temperature rise under power dissipation.
f_T	100 MHz - Transition frequency; indicates usable bandwidth for small-signal amplification or high-speed switching.
t_off	1 µs - Turn-off time at I_C = 100 mA; constrains maximum switching frequency in PWM-driven stages.

Pinout & Package

SOT89 (SC-62) plastic surface-mounted package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body; collector tab forms thermal pad and electrical connection.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node; connected to ground or low-side reference in common-emitter configurations.
2	Collector	Main current input node; electrically and thermally tied to large copper pad for heat dissipation.
3	Base	Control terminal; requires current-limited drive (e.g., via series resistor) to achieve desired I_C.

Key Features

Feature	Design Value
High current capability	1 A continuous I_C supports robust load switching without external heatsinking in compact designs.
Low V_CE(sat)	≤ 500 mV at I_C = 500 mA reduces conduction losses and self-heating in linear and saturated operation.
Thermally enhanced package	SOT89 collector tab enables direct thermal coupling to PCB copper, achieving R_th(j-sp) = 13 K/W.
Stable h_FE over temperature	h_FE maintains 50–300 range across −55 °C to +100 °C, enabling predictable biasing in wide-temperature environments.
Fast switching	250 ns turn-on and 1 µs turn-off support PWM frequencies up to ~100 kHz in non-critical timing applications.

Applications

Linear Voltage Regulators

Low-Side Switches

Use Scenario: Adjustable 3.3 V/5 V/12 V linear regulators supplying microcontrollers or sensors from 24 V or 48 V input rails.

IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via emitter-follower or series-regulator topology.

Use Value: 80 V V_CEO provides sufficient headroom for transient surges; 1.35 W P_tot allows >500 mA output at 10 V dropout without forced cooling.

Use Scenario: Enabling/disabling power to peripheral modules (e.g., displays, sensors, actuators) in portable medical or industrial handheld devices.

IC Role / Device Role / Timing Role: Ground-referenced switch sinking load current when base is driven high.

Use Value: 1 A I_C rating supports typical module loads; low V_CE(sat) limits voltage drop and power loss during active state.

Battery-Driven Devices

MOSFET Drivers

Use Scenario: Power path control and load switching in rechargeable Li-ion or multi-cell alkaline systems (e.g., power tools, portable analyzers).

IC Role / Device Role / Timing Role: Discrete switch managing battery discharge paths, enable signals, or protection circuitry.

Use Value: −65 °C to +150 °C operating range ensures reliability across storage and field use; low I_CEO (<100 nA) preserves battery life in standby.

Use Scenario: Level-shifting and gate drive for N-channel power MOSFETs in DC-DC converters or motor drivers.

IC Role / Device Role / Timing Role: Active pull-down stage accelerating MOSFET turn-off by discharging gate capacitance.

Use Value: 1 µs t_off and 100 MHz f_T enable effective gate discharge; 2 A I_CM handles brief gate charge currents.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BSR33,115	PNP complement with identical V_CEO (80 V), I_C (1 A), and SOT89 package; h_FE min 50 at I_C = 500 mA.	Used in high-side switching or complementary push-pull stages where sourcing current is required.	Select BSR33,115 only when PNP polarity is needed; not a drop-in replacement for BSR43,115 in NPN configurations.
BCX56-16,115	Same SOT89 package but higher h_FE (160–400), lower V_CEO (60 V), and reduced P_tot (1.25 W); R_th(j-a) = 100 K/W.	Better suited for low-voltage, high-gain amplification or low-dropout linear regulation below 48 V.	Choose BCX56-16,115 only if system voltage ≤60 V and higher DC gain is prioritized over thermal margin.

Compared with BSR33,115 and BCX56-16,115, the BSR43,115 uniquely balances 80 V breakdown, 1 A current, and 93 K/W thermal resistance - making it optimal for 48 V industrial linear regulators and battery-switching applications where voltage headroom and thermal efficiency are jointly critical.

Availability

BSR43,115 is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, battery-driven devices, and MOSFET drivers requiring stable component supply across industrial, instrumentation, and portable electronics programs.

Supply support for BSR43,115 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The BSR43,115 belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-effective, thermally robust medium-power switching and linear regulation in space-constrained SMT applications.

FAQ

What is the maximum allowable junction temperature for BSR43,115?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation. Derating is required above 25 °C ambient using R_th(j-a) = 93 K/W; for example, at 70 °C ambient, max allowable P_tot drops to ~0.86 W.

Can BSR43,115 be used in avalanche mode?

No - the BSR43,115 is not rated or characterized for avalanche operation. Its V_CEO = 80 V and V_CBO = 90 V are absolute maximum ratings; exceeding V_CEO with inductive loads may cause destructive breakdown unless externally clamped.

Is the SOT89 package lead-free and RoHS-compliant?

Yes - the BSR43,115 is manufactured in a lead-free, RoHS-compliant SOT89 package per Nexperia's product compliance documentation. The marking "AR4" on the device body confirms this variant, and reflow profiles follow JEDEC J-STD-020 standards for MSL3.

How does base-emitter saturation voltage vary with temperature?

V_BE(sat) decreases by approximately −2.2 mV/°C across −55 °C to +100 °C, as shown in Figure 6 of the datasheet. At I_C = 500 mA and I_B = 50 mA, V_BE(sat) ranges from ~1.2 V at −55 °C to ~0.9 V at +100 °C - critical for accurate base drive resistor selection in wide-temperature designs.

BSR43,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 5V

Power - Max:: 1.35 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BSR43,115 FAQ

1.How can I place an order for BSR43,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSR43,115 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 BSR43,115 reliable?

The price and inventory of BSR43,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR43,115 is usually 5 days.

3.What payment methods are accepted for BSR43,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR43,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSR43,115?

BSR43,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSR43,115 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 BSR43,115?

For technical support, including BSR43,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR43,115 requirements.

6.How does Aetrix verify that BSR43,115 is sourced from the original manufacturer or authorized distributors?

All BSR43,115 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 BSR43,115 meets industry standards.

7.What is the process for return or replacement of BSR43,115?

All BSR43,115 units undergo pre-shipment inspection (PSI). If there is an issue with BSR43,115, 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 BSR43,115 part is unused and in its original packaging.

Return procedure for BSR43,115:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…