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

NXP Semiconductors BC337-25,112

Name: BC337-25,112
Brand: NXP Semiconductors
SKU: BC337-25,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC337-25,112

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

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

Datasheet:: BC337-25,112.pdf

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

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Product details

Overview

BC337-25,112 from Nexperia is an NPN general-purpose bipolar junction transistor (BJT) in a through-hole SOT54 (TO-92) package, rated for 45 V V_CEO, 500 mA I_C, and DC current gain (h_FE) of 160–400 at I_C = 100 mA and V_CE = 1 V. It delivers low-saturation performance with V_CE(sat) ≤ 700 mV at I_C = 500 mA / I_B = 50 mA, and supports general-purpose switching in power supply control circuits.

For engineers reviewing the BC337-25,112 datasheet, BC337-25,112 pinout, BC337-25,112 application, or BC337-25,112 equivalent, this page provides verified pin configuration, thermal resistance (R_th(j-a) = 200 K/W), junction temperature limit (150 °C), packaging details (SOT54, bulk, straight leads), and validated alternative options for discrete BJT replacement in industrial and consumer designs.

Technical Context

The BC337-25,112 operates as a silicon NPN BJT optimized for linear amplification and saturated switching. Its h_FE binning (160–400) ensures consistent current gain across production lots under standard bias conditions (I_C = 100 mA, V_CE = 1 V). The device uses standard alloyed-junction construction with epoxy-molded TO-92-compatible packaging.

Thermal design relies on its R_th(j-a) of 200 K/W when mounted on FR4 PCB with single-sided copper, enabling reliable operation up to 150 °C junction temperature. Electrical limits include V_CBO = 50 V, V_EBO = 5 V, and P_tot = 625 mW at T_amb ≤ 25 °C - all defined per IEC 60134 Absolute Maximum Rating System.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown with base open; defines safe operating voltage in switching applications.
I_C (DC)	500 mA - Continuous collector current rating; sets upper bound for steady-state load drive capability.
h_FE	160–400 - DC current gain range at I_C = 100 mA, V_CE = 1 V; determines required base drive for target collector current.
V_CE(sat)	≤ 700 mV - Collector-emitter saturation voltage at I_C = 500 mA / I_B = 50 mA; directly impacts conduction loss and heat generation in switch mode.
P_tot	625 mW - Total power dissipation at T_amb ≤ 25 °C; constrains usable power envelope without heatsinking.
R_th(j-a)	200 K/W - Junction-to-ambient thermal resistance on standard FR4; enables thermal budget calculation for ambient-limited operation.
f_T	100 MHz - Transition frequency at I_C = 10 mA, V_CE = 5 V; indicates usable bandwidth for small-signal amplification.

Pinout & Package

BC337-25,112 is housed in a plastic single-ended leaded (through-hole) SOT54 (TO-92/SC-43A) package with 3 leads. The package outline conforms to JEDEC TO-92 standards, with body dimensions approximately 4.8 mm × 4.2 mm × 14.5 mm and lead pitch of 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to ground or low-side reference in common-emitter configurations.
2	Base	Control input; requires current-limited drive (e.g., via series resistor) to achieve desired h_FE-scaled collector current.
3	Collector	Current entry terminal; connects to load or supply rail in low-side switch topologies.

Key Features

Feature	Design Value
High DC current gain binning	h_FE = 160–400 ensures predictable base drive requirements for 100–500 mA loads without gain variation-induced instability.
Low V_CE(sat)	≤ 700 mV at full-rated 500 mA enables <100 mW conduction loss, reducing thermal stress in compact layouts.
Robust thermal rating	150 °C max junction temperature and 625 mW power dissipation support operation in unventilated industrial enclosures.
Standard TO-92 compatibility	SOT54 footprint allows drop-in replacement of legacy BC337 variants and interoperability with existing through-hole assembly processes.

Applications

LED Driver Circuit	Microcontroller I/O Interface
Use Scenario: Driving high-brightness indicator LEDs from 5 V or 3.3 V logic outputs in embedded control panels. IC Role / Device Role / Timing Role: NPN switch providing current amplification between MCU GPIO and LED load. Use Value: Enables 20–100 mA LED current with minimal GPIO loading, leveraging h_FE ≥ 160 to keep base current below 1 mA.	Use Scenario: Level-shifting and signal inversion between 3.3 V microcontrollers and 5 V peripheral logic. IC Role / Device Role / Timing Role: Discrete inverter or level translator in digital interface circuits. Use Value: Delivers fast edge response (f_T = 100 MHz) and rail-to-rail output swing with no external bias components required.
DC Motor Control (Small)	Power Supply Enable Switch
Use Scenario: On/off control of 12 V, <500 mA brushed DC motors in appliance actuators or fan modules. IC Role / Device Role / Timing Role: Low-side switch activated by PWM or logic-level enable signals. Use Value: Supports continuous 500 mA motor current with V_CE(sat) ≤ 700 mV, limiting resistive loss to <350 mW at full load.	Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V rails in multi-voltage power systems using system controller signals. IC Role / Device Role / Timing Role: High-side or low-side pass element controlled by enable logic. Use Value: Provides clean, low-loss power gating with 45 V V_CEO margin over typical 5–12 V supply rails.

LED Driver Circuit

Microcontroller I/O Interface

Use Scenario: Driving high-brightness indicator LEDs from 5 V or 3.3 V logic outputs in embedded control panels.

IC Role / Device Role / Timing Role: NPN switch providing current amplification between MCU GPIO and LED load.

Use Value: Enables 20–100 mA LED current with minimal GPIO loading, leveraging h_FE ≥ 160 to keep base current below 1 mA.

Use Scenario: Level-shifting and signal inversion between 3.3 V microcontrollers and 5 V peripheral logic.

IC Role / Device Role / Timing Role: Discrete inverter or level translator in digital interface circuits.

Use Value: Delivers fast edge response (f_T = 100 MHz) and rail-to-rail output swing with no external bias components required.

DC Motor Control (Small)

Power Supply Enable Switch

Use Scenario: On/off control of 12 V, <500 mA brushed DC motors in appliance actuators or fan modules.

IC Role / Device Role / Timing Role: Low-side switch activated by PWM or logic-level enable signals.

Use Value: Supports continuous 500 mA motor current with V_CE(sat) ≤ 700 mV, limiting resistive loss to <350 mW at full load.

Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V rails in multi-voltage power systems using system controller signals.

IC Role / Device Role / Timing Role: High-side or low-side pass element controlled by enable logic.

Use Value: Provides clean, low-loss power gating with 45 V V_CEO margin over typical 5–12 V supply rails.

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
BC337-40,112	Higher h_FE range (250–600); otherwise identical V_CEO, I_C, package, and saturation specs.	Better suited for ultra-low-base-drive applications (e.g., direct GPIO drive without base resistor).	Select BC337-40,112 only if higher gain is needed; BC337-25,112 offers tighter h_FE tolerance for predictable biasing.
BC337-16,112	Lower h_FE range (100–250); same voltage/current ratings and thermal characteristics.	Preferred where gain stability over temperature or reduced sensitivity to base drive variance is critical.	Choose BC337-16,112 for conservative designs requiring guaranteed minimum h_FE of 100 at high temperature.

Compared with BC337-40,112 and BC337-16,112, the BC337-25,112 strikes a balance between gain headroom and predictability - delivering sufficient h_FE for most 500 mA switching tasks while avoiding excessive gain that could cause unintended turn-on in noisy environments.

Availability

BC337-25,112 is available at Aetrix Electronics and suitable for industrial control interfaces, consumer appliance power management, and embedded LED driver circuits requiring stable component supply and long-term manufacturing continuity.

Supply support for BC337-25,112 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability BJTs, MOSFETs, and logic devices.

The BC337-25,112 belongs to Nexperia's legacy general-purpose transistor family designed for cost-sensitive, high-reliability switching and amplification in automotive, industrial, and consumer electronics.

FAQ

What is the maximum collector-emitter voltage rating for BC337-25,112?

The BC337-25,112 has a maximum collector-emitter voltage (V_CEO) rating of 45 V under open-base conditions with I_C = 10 mA. This rating is defined per IEC 60134 and must not be exceeded to prevent avalanche breakdown. Derating is recommended above 25 °C ambient temperature per the device's thermal characteristics.

Does BC337-25,112 support 500 mA continuous collector current in real-world PCB layouts?

Yes - the BC337-25,112 is rated for 500 mA DC collector current (I_C) when mounted on a standard FR4 PCB with single-sided copper and tin plating. Achieving this requires maintaining T_amb ≤ 25 °C and accounting for its 625 mW total power dissipation limit and 200 K/W junction-to-ambient thermal resistance.

What is the pin configuration of BC337-25,112 in the SOT54 package?

The BC337-25,112 uses the standard SOT54 (TO-92) pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is confirmed in Table 3 of the official Nexperia datasheet and applies identically across all BC337 variants in SOT54, SOT54A, and SOT54 variant packages.

How does the h_FE range of BC337-25,112 compare to BC337-16,112 and BC337-40,112?

The BC337-25,112 has a DC current gain (h_FE) range of 160–400 at I_C = 100 mA and V_CE = 1 V. In contrast, BC337-16,112 is binned 100–250, and BC337-40,112 is binned 250–600. All share identical voltage, current, and thermal ratings - only h_FE differs by selection group.

Is BC337-25,112 RoHS compliant and halogen-free?

Yes - BC337-25,112 complies with EU RoHS Directive 2011/65/EU and is halogen-free per Nexperia's product compliance documentation. The device carries the "green" marking designation and meets JEDEC J-STD-704 requirements for bromine and chlorine content.

BC337-25,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Bulk

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:: 160 @ 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

BC337-25,112 FAQ

1.How can I place an order for BC337-25,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337-25,112 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 BC337-25,112 reliable?

The price and inventory of BC337-25,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337-25,112 is usually 5 days.

3.What payment methods are accepted for BC337-25,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337-25,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337-25,112?

BC337-25,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337-25,112 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 BC337-25,112?

For technical support, including BC337-25,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337-25,112 requirements.

6.How does Aetrix verify that BC337-25,112 is sourced from the original manufacturer or authorized distributors?

All BC337-25,112 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 BC337-25,112 meets industry standards.

7.What is the process for return or replacement of BC337-25,112?

All BC337-25,112 units undergo pre-shipment inspection (PSI). If there is an issue with BC337-25,112, 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 BC337-25,112 part is unused and in its original packaging.

Return procedure for BC337-25,112:

1.Submit a request within 90 days.

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

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