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

NXP Semiconductors BC337,126

Name: BC337,126
Brand: NXP Semiconductors
SKU: BC337,126
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC337,126

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BC337,126.pdf

Description:: TRANS NPN 45V 0.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC337,126 from Nexperia is an NPN general-purpose bipolar junction transistor (BJT) in a through-hole SOT54A (TO-92 wide-pitch) package, rated for 45 V V_CEO, 500 mA continuous collector current, and 625 mW power dissipation at T_amb ≤ 25 °C. It serves as a low-voltage, medium-current switch or linear amplifier in discrete analog and digital interface circuits.

For engineers reviewing the BC337,126 datasheet, BC337,126 pinout, BC337,126 application, or BC337,126 equivalent, this page delivers verified electrical parameters, thermal behavior, package-specific mounting guidance, and validated alternative options for industrial control, power management, and signal conditioning designs.

Technical Context

The BC337,126 operates as a silicon NPN BJT with DC current gain (h_FE) ranging from 100 to 600 depending on selection group (e.g., BC337-16, -25, -40), and exhibits V_CE(sat) ≤ 700 mV at I_C = 500 mA and I_B = 50 mA. Its base-emitter voltage (V_BE) is ≤ 1.2 V under same conditions.

Designed for stable operation across −65 °C to +150 °C junction temperature, it features low leakage (I_CBO ≤ 100 nA at 25 °C), 3 pF collector capacitance, and 100 MHz transition frequency (f_T). Thermal resistance R_th(j-a) is 200 K/W on FR4 PCB with standard footprint.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in switching applications.
I_C (DC)	500 mA - Continuous collector current rating; supports medium-power load switching without forced cooling.
P_tot	625 mW at T_amb ≤ 25 °C - Total power dissipation limit; determines thermal derating curve for ambient temperatures above 25 °C.
h_FE	100–600 - DC current gain range across BC337 variants; enables predictable base drive sizing for saturation or linear operation.
V_CE(sat)	≤ 700 mV at I_C = 500 mA, I_B = 50 mA - Low saturation voltage reduces conduction loss in switching mode.
f_T	100 MHz - Transition frequency; supports amplification and switching up to low RF frequencies.
R_th(j-a)	200 K/W - Junction-to-ambient thermal resistance on FR4 PCB; informs heatsinking requirements for sustained high-current operation.

Pinout & Package

BC337,126 uses the SOT54A (TO-92 wide-pitch) plastic single-ended leaded package with 2.54 mm lead spacing (e = 2.54 mm) and 5.08 mm pitch between outer leads (e1 = 5.08 mm). Leads are straight, tinned, and intended for through-hole mounting.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink node; connects to ground or low-side return path in common-emitter configurations.
2	Base	Control input; requires current-limited drive (e.g., via series resistor) to achieve target I_C and saturation.
3	Collector	Current source node; connects to load and supply rail in low-side switch topology.

Key Features

Feature	Design Value
High current capability	500 mA DC collector current supports driving relays, LEDs, and small solenoids directly.
Low saturation voltage	V_CE(sat) ≤ 700 mV minimizes power loss and self-heating during on-state operation.
Wide gain range	h_FE = 100–600 across variants allows precise base biasing for diverse load and speed requirements.
Robust thermal performance	R_th(j-a) = 200 K/W enables reliable operation up to 150 °C junction temperature without external heatsink.
Through-hole reliability	SOT54A mechanical stability and lead coplanarity ensure consistent solder joint integrity in wave-soldered assemblies.

Applications

Industrial Control Logic	Power Supply Sequencing
Use Scenario: Driving optocoupler inputs and relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: Discrete NPN switch controlling 24 V DC loads with galvanic isolation. Use Value: 500 mA I_C rating and 45 V V_CEO accommodate industrial supply rails and inductive kickback suppression.	Use Scenario: Enabling/sequencing auxiliary rails in multi-output AC-DC adapters. IC Role / Device Role / Timing Role: Low-side enable switch for 5 V or 3.3 V secondary outputs. Use Value: V_CE(sat) ≤ 700 mV ensures minimal voltage drop and thermal rise during continuous conduction.
LED Driver Circuits	Signal Level Translation
Use Scenario: Constant-current switching for indicator and status LEDs in embedded HMI panels. IC Role / Device Role / Timing Role: Saturated switch regulating LED current via emitter resistor feedback. Use Value: h_FE ≥ 100 guarantees stable current regulation across temperature and unit-to-unit variation.	Use Scenario: Converting 3.3 V logic signals to 5 V or 12 V levels for legacy peripherals. IC Role / Device Role / Timing Role: Common-emitter level shifter with pull-up resistor on collector. Use Value: f_T = 100 MHz supports clean edge transitions up to ~10 MHz digital signaling.

Industrial Control Logic

Power Supply Sequencing

Use Scenario: Driving optocoupler inputs and relay coils in PLC I/O modules.

IC Role / Device Role / Timing Role: Discrete NPN switch controlling 24 V DC loads with galvanic isolation.

Use Value: 500 mA I_C rating and 45 V V_CEO accommodate industrial supply rails and inductive kickback suppression.

Use Scenario: Enabling/sequencing auxiliary rails in multi-output AC-DC adapters.

IC Role / Device Role / Timing Role: Low-side enable switch for 5 V or 3.3 V secondary outputs.

Use Value: V_CE(sat) ≤ 700 mV ensures minimal voltage drop and thermal rise during continuous conduction.

LED Driver Circuits

Signal Level Translation

Use Scenario: Constant-current switching for indicator and status LEDs in embedded HMI panels.

IC Role / Device Role / Timing Role: Saturated switch regulating LED current via emitter resistor feedback.

Use Value: h_FE ≥ 100 guarantees stable current regulation across temperature and unit-to-unit variation.

Use Scenario: Converting 3.3 V logic signals to 5 V or 12 V levels for legacy peripherals.

IC Role / Device Role / Timing Role: Common-emitter level shifter with pull-up resistor on collector.

Use Value: f_T = 100 MHz supports clean edge transitions up to ~10 MHz digital signaling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC337-40,126	Higher h_FE (250–600) vs. BC337,126's unspecified gain bin; identical package and ratings.	Better suited for low-base-drive applications where precise current gain matters (e.g., analog amplification).	Select BC337-40,126 when higher DC gain is required without changing layout or thermal design.
BC337-25,126	Moderate h_FE (160–400); otherwise matches BC337,126 in V_CEO, I_C, P_tot, and pinout.	Offers balanced gain-bandwidth trade-off for general switching where moderate drive margin is sufficient.	Choose BC337-25,126 for cost-sensitive volume production where mid-range h_FE meets functional requirements.

Compared with BC337,126, BC337-40,126 provides higher guaranteed current gain for reduced base drive burden, while BC337-25,126 offers tighter h_FE distribution and lower cost-both retain identical thermal, voltage, and packaging characteristics for drop-in compatibility in SOT54A layouts.

Availability

BC337,126 is available at Aetrix Electronics and suitable for industrial control logic, power supply sequencing, LED driver circuits, and signal level translation requiring stable component supply and long-term manufacturability.

Supply support for BC337,126 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, consumer, and wearable markets.

The BC337,126 belongs to Nexperia's general-purpose bipolar transistor product line, engineered for robust, cost-effective switching and amplification in high-volume industrial and consumer electronics.

FAQ

What is the package type of BC337,126?

The BC337,126 is supplied in the SOT54A (TO-92 wide-pitch) through-hole package, featuring 5.08 mm outer-lead pitch (e1), 2.54 mm center-to-center spacing (e), and straight tinned leads compatible with wave soldering. This differs from the standard SOT54 (e = 2.54 mm) and SOT54 variant (on-circle pinning).

Does BC337,126 have a specified DC current gain (h_FE)?

No-BC337,126 is the packing variant (tape ammopack, wide pitch) and does not denote a specific h_FE bin. The underlying BC337 device family offers three gain groups: BC337-16 (h_FE = 100–250), BC337-25 (160–400), and BC337-40 (250–600). Gain selection must be confirmed via the full 12-digit Nexperia ordering code or marking (e.g., C33716).

What is the maximum power dissipation of BC337,126 at room temperature?

The BC337,126 has a total power dissipation (P_tot) of 625 mW at ambient temperature ≤ 25 °C when mounted on a standard FR4 PCB with single-sided copper. Derating begins above 25 °C at 5.0 mW/°C, reaching zero dissipation at 150 °C ambient.

Can BC337,126 replace BC337-40 in a design?

Yes-BC337,126 is a packing variant of the BC337 series and shares identical electrical and thermal specifications with BC337-40, including V_CEO = 45 V, I_C = 500 mA, and P_tot = 625 mW. However, BC337,126 itself does not guarantee the higher h_FE (250–600) of BC337-40 unless explicitly ordered as BC337-40,126.

What are the absolute maximum ratings for BC337,126?

The absolute maximum ratings for BC337,126 include V_CBO = 50 V, V_CEO = 45 V, V_EBO = 5 V, I_C = 500 mA, I_CM = 1 A (peak), I_BM = 200 mA (peak), and T_j = 150 °C. Exceeding any of these may cause permanent damage per IEC 60134 limiting values system.

BC337,126 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC337,126 FAQ

1.How can I place an order for BC337,126 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337,126 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 BC337,126 reliable?

The price and inventory of BC337,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337,126 is usually 5 days.

3.What payment methods are accepted for BC337,126?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337,126 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337,126?

BC337,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337,126 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 BC337,126?

For technical support, including BC337,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337,126 requirements.

6.How does Aetrix verify that BC337,126 is sourced from the original manufacturer or authorized distributors?

All BC337,126 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 BC337,126 meets industry standards.

7.What is the process for return or replacement of BC337,126?

All BC337,126 units undergo pre-shipment inspection (PSI). If there is an issue with BC337,126, 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 BC337,126 part is unused and in its original packaging.

Return procedure for BC337,126:

1.Submit a request within 90 days.

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

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