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

onsemi BCX56-10R1

Name: BCX56-10R1
Brand: onsemi
SKU: BCX56-10R1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX56-10R1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX56-10R1.pdf

Description:: TRANS NPN 80V 1A SOT-89-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BCX56-10R1 from onsemi is a medium-power NPN silicon epitaxial transistor in SOT-89 package, rated for 80 V_CEO, 1.0 A collector current, and 1.56 W power dissipation at T_A = 25°C; designed for audio amplifier stages requiring high-current linear operation.

For engineers reviewing the BCX56-10R1 datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/I_C rating match, h_FE consistency across 5–500 mA, V_CE(sat) ≤ 0.5 V at I_C/I_B = 10, thermal resistance under surface-mount conditions, and SOT-89 mechanical compatibility.

Technical Context

This device operates as a linear amplifying transistor with DC current gain (h_FE) ranging from 25 to 160-measured at I_C = 5 mA, 150 mA, and 500 mA respectively-and delivers f_T = 130 MHz at I_C = 10 mA, V_CE = 5 V.

Its breakdown ratings-V_(BR)CBO = 100 V, V_(BR)CEO = 80 V, V_(BR)EBO = 5 V-define safe operating limits in common-emitter, common-base, and emitter-follower configurations; saturation behavior is characterized by V_CE(sat) ≤ 0.5 V and V_BE(on) ≤ 1.0 V under specified drive conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum collector-emitter voltage before avalanche in common-emitter mode
I_C	1.0 A - Continuous DC collector current capability at T_A = 25°C
P_D	1.56 W - Total power dissipation limit on FR-4 board with 1.0 × 1.0 inch copper pad
h_FE	25–160 - DC current gain range across 5 mA to 500 mA operating points
f_T	130 MHz - Transition frequency defining usable bandwidth in small-signal amplification
V_CE(sat)	≤ 0.5 V - Collector-emitter voltage drop in saturation at I_C = 500 mA, I_B = 50 mA
R_θJA	80 °C/W - Junction-to-ambient thermal resistance with standard PCB layout

Pinout & Package

SOT-89 (Case 1213, Style 2) surface-mount package with 3 leads, designed for medium-power thermal performance on FR-4 PCBs; footprint compatible with automated pick-and-place and reflow soldering per JEDEC J-STD-020 profile.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Current-driven gate for transistor biasing; requires I_B ≈ I_C/h_FE to achieve target conduction
2 (Collector)	High-side output node	Carries full load current; electrically connected to heatsink-capable tab in SOT-89 outline
3 (Emitter)	Reference/return path	Common return for base and collector currents; tied to ground or low-impedance rail in most amplifier topologies

Key Features

Feature	Design Value
High-current capability	1.0 A continuous I_C supports driver-stage loads in Class-A/B audio amplifiers
Medium-power thermal design	1.56 W P_D with 80 °C/W R_θJA enables stable operation without external heatsink on standard PCB
Wide h_FE operating range	25–160 h_FE across 5–500 mA ensures predictable gain in both small- and large-signal regions
High-frequency response	130 MHz f_T allows use in RF pre-driver or wideband analog signal paths up to ~20 MHz

Applications

Audio Power Amplifier Stage	DC Motor Driver Output
Use Scenario: Final gain stage in portable stereo amplifier delivering 0.5–1 W into 8 Ω speaker load. IC Role / Device Role / Timing Role: Medium-power NPN switching/amplifying transistor in emitter-follower or common-emitter configuration. Use Value: Delivers 1.0 A peak current with V_CE(sat) ≤ 0.5 V, minimizing heat generation and enabling compact enclosure design.	Use Scenario: H-bridge half-bridge leg driving 12 V, 500 mA brushed DC motor in industrial actuator. IC Role / Device Role / Timing Role: High-current switch controlling motor direction and speed via PWM. Use Value: Withstood 80 V transients during inductive kickback and maintained <0.5 V saturation drop at 500 mA.
Linear Voltage Regulator Pass Element	LED Constant-Current Driver
Use Scenario: Series pass transistor in adjustable 3–12 V, 500 mA linear regulator for sensor supply rails. IC Role / Device Role / Timing Role: Active current-regulating element dissipating variable power based on load and input differential. Use Value: 1.56 W P_D and 80 °C/W R_θJA allow reliable operation with ≤30°C temperature rise at full load on standard PCB.	Use Scenario: Constant-current sink for high-brightness white LED string (3.2 V, 350 mA) in signage backlight. IC Role / Device Role / Timing Role: Precision current-controlled switch regulating LED brightness via base current feedback. Use Value: Stable h_FE across 100–500 mA enables accurate current mirroring without trimming resistors.

Audio Power Amplifier Stage

DC Motor Driver Output

Use Scenario: Final gain stage in portable stereo amplifier delivering 0.5–1 W into 8 Ω speaker load.

IC Role / Device Role / Timing Role: Medium-power NPN switching/amplifying transistor in emitter-follower or common-emitter configuration.

Use Value: Delivers 1.0 A peak current with V_CE(sat) ≤ 0.5 V, minimizing heat generation and enabling compact enclosure design.

Use Scenario: H-bridge half-bridge leg driving 12 V, 500 mA brushed DC motor in industrial actuator.

IC Role / Device Role / Timing Role: High-current switch controlling motor direction and speed via PWM.

Use Value: Withstood 80 V transients during inductive kickback and maintained <0.5 V saturation drop at 500 mA.

Linear Voltage Regulator Pass Element

LED Constant-Current Driver

Use Scenario: Series pass transistor in adjustable 3–12 V, 500 mA linear regulator for sensor supply rails.

IC Role / Device Role / Timing Role: Active current-regulating element dissipating variable power based on load and input differential.

Use Value: 1.56 W P_D and 80 °C/W R_θJA allow reliable operation with ≤30°C temperature rise at full load on standard PCB.

Use Scenario: Constant-current sink for high-brightness white LED string (3.2 V, 350 mA) in signage backlight.

IC Role / Device Role / Timing Role: Precision current-controlled switch regulating LED brightness via base current feedback.

Use Value: Stable h_FE across 100–500 mA enables accurate current mirroring without trimming resistors.

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
BCX56-16R1	Higher h_FE min = 100 at I_C = 150 mA; same V_CEO, I_C, package	Better suited for low-drive applications where base current must be minimized	Select when circuit requires higher gain stability above 100 mA without increasing base drive
MJD127G	TO-252 package; V_CEO = 80 V, I_C = 2 A, P_D = 20 W; higher thermal mass	Used in higher-power amplifier outputs or industrial motor drives needing >1.5 W dissipation	Choose only if PCB layout accommodates larger footprint and thermal management supports >10 W dissipation

Compared with BCX56-10R1, BCX56-16R1 offers higher DC gain for reduced base drive but identical voltage/current ratings, while MJD127G provides significantly higher power handling in a larger package-neither is pin-compatible, and substitution requires layout and thermal redesign.

Availability

BCX56-10R1 is available at Aetrix Electronics and suitable for audio amplifier stages, DC motor drivers, linear regulator pass elements, and LED constant-current drivers requiring stable component supply and consistent parametric performance across production batches.

Supply support for BCX56-10R1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and logic devices for automotive, industrial, and consumer markets.

The BCX56-10R1 belongs to onsemi's legacy bipolar transistor product line, engineered for cost-sensitive, medium-power linear and switching applications where reliability, thermal robustness, and SOT-89 mountability are critical.

FAQ

What is the maximum collector-emitter voltage rating for BCX56-10R1?

The BCX56-10R1 has a maximum collector-emitter voltage (V_CEO) rating of 80 Vdc at T_C = 25°C. This rating defines the upper limit for safe operation in common-emitter configuration with base open. Exceeding this voltage risks avalanche breakdown and permanent device damage. Derating is required at elevated junction temperatures per the datasheet thermal curves.

Does BCX56-10R1 support surface-mount reflow soldering, and what profile should be used?

Yes, BCX56-10R1 is qualified for surface-mount reflow soldering in its SOT-89 package. The recommended JEDEC J-STD-020 profile specifies peak solder temperature of 260°C for ≤10 seconds, with liquidus time of 40–80 seconds. Figure 6 in the official BCX56-10R1 datasheet shows the full seven-step heating curve optimized for both low- and high-mass assemblies.

What is the DC current gain (hFE) range of BCX56-10R1 across its operating current?

The BCX56-10R1 exhibits h_FE = 25–160, measured at three distinct operating points: min 25 at I_C = 5 mA, min 63 at I_C = 150 mA, and min 25 at I_C = 500 mA. This non-monotonic variation reflects typical bipolar transistor behavior and must be accounted for in bias network design-especially in linear amplifier applications where gain stability across signal swing is critical.

Can BCX56-10R1 be used in switching applications, and what is its saturation voltage?

Yes, BCX56-10R1 is suitable for medium-speed switching applications. Its collector-emitter saturation voltage (V_CE(sat)) is guaranteed ≤ 0.5 Vdc at I_C = 500 mAdc and I_B = 50 mAdc. This low saturation drop minimizes conduction loss in driver circuits, though switching speed is limited by f_T = 130 MHz and minority-carrier storage time-not optimized for >100 kHz PWM.

What is the thermal resistance junction-to-ambient for BCX56-10R1 on a standard PCB?

The BCX56-10R1 has a junction-to-ambient thermal resistance (R_θJA) of 80 °C/W when mounted on an FR-4 PCB with a 1.0 × 1.0 inch copper pad. This value assumes surface-mount installation per the SOT-89 footprint in Case 1213–02. With no additional heatsinking, this allows ~20°C temperature rise at 250 mW dissipation-critical for predicting junction temperature in BCX56-10R1-based designs.

BCX56-10R1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 63 @ 150mA, 2V

Power - Max:: 1.56 W

Frequency - Transition:: 130MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

BCX56-10R1 FAQ

1.How can I place an order for BCX56-10R1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX56-10R1 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 BCX56-10R1 reliable?

The price and inventory of BCX56-10R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX56-10R1 is usually 5 days.

3.What payment methods are accepted for BCX56-10R1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX56-10R1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX56-10R1?

BCX56-10R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX56-10R1 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 BCX56-10R1?

For technical support, including BCX56-10R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX56-10R1 requirements.

6.How does Aetrix verify that BCX56-10R1 is sourced from the original manufacturer or authorized distributors?

All BCX56-10R1 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 BCX56-10R1 meets industry standards.

7.What is the process for return or replacement of BCX56-10R1?

All BCX56-10R1 units undergo pre-shipment inspection (PSI). If there is an issue with BCX56-10R1, 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 BCX56-10R1 part is unused and in its original packaging.

Return procedure for BCX56-10R1:

1.Submit a request within 90 days.

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

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