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

onsemi BC337-025

Name: BC337-025
Brand: onsemi
SKU: BC337-025
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC337-025

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: BC337-025.pdf

Description:: TRANS NPN 45V 0.8A TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,544

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

Product details

Overview

BC337-025 from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 45 V_CEO, 800 mA continuous collector current, and DC current gain (h_FE) of 160–250 at I_C = 100 mA, V_CE = 1.0 V - widely used in low-voltage switching and linear amplification stages of consumer power supplies and signal conditioning circuits.

For engineers reviewing the BC337-025 datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed h_FE range, V_CEO/V_CBO ratings, thermal resistance (R_JA = 200 °C/W), and TO-92 mechanical compatibility with legacy through-hole designs requiring discrete gain control.

Technical Context

The BC337-025 operates as a medium-current, medium-voltage NPN bipolar junction transistor optimized for linear amplification and saturated switching. Its h_FE binning (160–250) ensures predictable base drive requirements across production lots, while f_T = 210 MHz supports audio-frequency and low-speed digital signal handling without parasitic oscillation.

Thermal design is constrained by R_JC = 83.3 °C/W and R_JA = 200 °C/W, requiring PCB copper area or forced airflow for sustained >300 mA operation. Safe operating area (SOA) limits are defined up to 1 ms pulse width at V_CE ≤ 45 V, with second breakdown avoided below 135 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; defines safe rail voltage headroom in switching applications.
I_C (continuous)	800 mA - Continuous collector current rating at T_A = 25°C; derates linearly above ambient temperature.
h_FE	160–250 - DC current gain at I_C = 100 mA, V_CE = 1.0 V; determines required base drive for saturation or linear biasing.
V_CE(sat)	≤ 0.7 V at I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss in switch-mode topologies.
f_T	210 MHz - Transition frequency confirms usable bandwidth up to ~20 MHz for small-signal amplification.
R_JA	200 °C/W - Junction-to-ambient thermal resistance; dictates minimum PCB copper area needed for thermal management.

Pinout & Package

BC337-025 uses the standard TO-92 (Case 29, Style 17) plastic package with 3 leads in straight-line configuration and lead pitch of 2.54 mm. The package is compatible with wave soldering and manual prototyping.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main current output terminal	Connected to load or next stage; carries full collector current; requires heatsinking at high duty cycles.
2 (Base)	Control input terminal	Receives current-limited drive signal; base resistor must be selected to ensure I_B ≥ I_C/h_FE(min) for saturation.
3 (Emitter)	Current return path	Typically grounded or connected to emitter resistor for bias stability; referenced for V_BE and V_CE measurements.

Key Features

Feature	Design Value
Pb-free TO-92 packaging	Complies with RoHS Directive 2011/65/EU; suitable for lead-free reflow and wave soldering processes.
Guaranteed h_FE binning	160–250 range ensures consistent gain behavior across production batches, reducing calibration effort in analog designs.
Low V_CE(sat)	≤ 0.7 V enables <100 mW conduction loss at 500 mA, improving efficiency in relay drivers and LED switches.
High f_T	210 MHz allows stable operation in audio preamps and low-speed logic interface circuits without external compensation.
Wide T_J range	−55°C to +150°C junction temperature rating supports automotive under-hood and industrial control environments.

Applications

Audio Pre-amplifier Stage	DC Motor Speed Control
Use Scenario: Amplifying microphone-level signals (1–10 mV) into line-level outputs (0.3–1 V) in portable audio recorders. IC Role / Device Role / Timing Role: Linear amplifier configured in common-emitter topology with emitter degeneration for gain stability. Use Value: h_FE ≥ 160 ensures sufficient open-loop gain; f_T = 210 MHz avoids high-frequency roll-off in 20 kHz bandwidth designs.	Use Scenario: Driving 12 V, 300 mA brushed DC motors in robotic actuators using PWM at 1–5 kHz. IC Role / Device Role / Timing Role: Saturated switch controlling motor current path between supply and ground. Use Value: V_CE(sat) ≤ 0.7 V limits power dissipation to <210 mW at full load, enabling operation without heatsink.
LED Current Regulator	Power Supply Error Amplifier
Use Scenario: Constant-current driver for high-brightness white LEDs in emergency lighting systems (3.3 V forward, 350 mA). IC Role / Device Role / Timing Role: Current source configured with emitter resistor feedback and base bias network. Use Value: Tight h_FE binning reduces current variation across units; V_CEO = 45 V provides margin against transient spikes.	Use Scenario: Error amplifier in 5 V, 2 A buck converter feedback loop, comparing output voltage to reference. IC Role / Device Role / Timing Role: Transconductance amplifier driving optocoupler LED to regulate isolated secondary side. Use Value: f_T = 210 MHz supports phase margin >45° at 100 kHz crossover; low noise improves regulation accuracy.

Audio Pre-amplifier Stage

DC Motor Speed Control

Use Scenario: Amplifying microphone-level signals (1–10 mV) into line-level outputs (0.3–1 V) in portable audio recorders.

IC Role / Device Role / Timing Role: Linear amplifier configured in common-emitter topology with emitter degeneration for gain stability.

Use Value: h_FE ≥ 160 ensures sufficient open-loop gain; f_T = 210 MHz avoids high-frequency roll-off in 20 kHz bandwidth designs.

Use Scenario: Driving 12 V, 300 mA brushed DC motors in robotic actuators using PWM at 1–5 kHz.

IC Role / Device Role / Timing Role: Saturated switch controlling motor current path between supply and ground.

Use Value: V_CE(sat) ≤ 0.7 V limits power dissipation to <210 mW at full load, enabling operation without heatsink.

LED Current Regulator

Power Supply Error Amplifier

Use Scenario: Constant-current driver for high-brightness white LEDs in emergency lighting systems (3.3 V forward, 350 mA).

IC Role / Device Role / Timing Role: Current source configured with emitter resistor feedback and base bias network.

Use Value: Tight h_FE binning reduces current variation across units; V_CEO = 45 V provides margin against transient spikes.

Use Scenario: Error amplifier in 5 V, 2 A buck converter feedback loop, comparing output voltage to reference.

IC Role / Device Role / Timing Role: Transconductance amplifier driving optocoupler LED to regulate isolated secondary side.

Use Value: f_T = 210 MHz supports phase margin >45° at 100 kHz crossover; low noise improves regulation accuracy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN amplifier transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC337-25RL1G	Pb-free TO-92 in tape-and-reel (2000 pcs); identical electrical specs and h_FE binning.	Designed for automated SMT placement; same pinout and thermal profile as BC337-025.	Select when sourcing for high-volume PCB assembly with pick-and-place equipment.
BC337-40	Higher h_FE range (250–400); otherwise identical max ratings and package.	Enables lower base drive current in low-power battery-operated circuits; may require recalibration of bias networks.	Choose where higher gain reduces quiescent current, but verify SOA margins remain sufficient at target I_C.

Compared with BC337-25RL1G and BC337-40, the BC337-025 offers balanced gain and robustness for general-purpose use - BC337-25RL1G adds packaging convenience for automation, while BC337-40 trades wider gain spread for reduced base current demand in ultra-low-power designs.

Availability

BC337-025 is available at Aetrix Electronics and suitable for consumer audio interfaces, industrial motor controls, LED lighting drivers, and power supply feedback circuits requiring stable component supply and long-term obsolescence support.

Supply support for BC337-025 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BC337-025 belongs to onsemi's legacy general-purpose transistor family designed for cost-sensitive, high-reliability linear and switching applications in mass-produced electronics where proven performance and long-term availability are critical.

FAQ

What is the maximum collector-emitter voltage rating for BC337-025?

The BC337-025 has a maximum collector-emitter voltage (V_CEO) rating of 45 Vdc, verified per the official onsemi datasheet (BC337/D, Rev. 5). This rating applies at I_C = 10 mA and I_B = 0, and defines the absolute upper limit before avalanche breakdown occurs. Exceeding this voltage risks permanent device failure, even momentarily.

Does BC337-025 have a guaranteed DC current gain range?

Yes, the BC337-025 is binned to guarantee a DC current gain (h_FE) range of 160 to 250 when measured at I_C = 100 mA and V_CE = 1.0 V, as specified in the onsemi BC337/D datasheet. This binning ensures predictable base drive requirements across production lots, unlike un-binned variants such as the base BC337.

What package type does BC337-025 use, and is it RoHS-compliant?

The BC337-025 uses the TO-92 (Case 29, Style 17) plastic package with 3 leads in straight-line configuration. Per the onsemi datasheet, BC337-025G and BC337-025RL1G variants are explicitly marked Pb-Free and RoHS-compliant; standard BC337-025 meets legacy RoHS exemptions but is not Pb-free unless suffixed with "G".

Can BC337-025 be used in switching applications, and what is its saturation voltage?

Yes, the BC337-025 is commonly used in saturated switching applications. Its collector-emitter saturation voltage (V_CE(sat)) is guaranteed ≤ 0.7 V when I_C = 500 mA and I_B = 50 mA. This low V_CE(sat) minimizes conduction losses - for example, only 350 mW dissipation at 500 mA - making it suitable for relay drivers and LED switches.

What is the thermal resistance of BC337-025, and how does it affect PCB layout?

The BC337-025 has a junction-to-ambient thermal resistance (R_JA) of 200 °C/W in free-air conditions. To maintain T_J ≤ 135°C at 500 mA continuous current, the PCB must provide ≥ 2.5 cm² of 1 oz copper pour connected to the emitter pad. Without added copper or airflow, power dissipation must stay below 312 mW to avoid thermal runaway.

BC337-025 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 800 mA

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

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

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 160 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 210MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

BC337-025 FAQ

1.How can I place an order for BC337-025 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337-025 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 BC337-025 reliable?

The price and inventory of BC337-025 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337-025 is usually 5 days.

3.What payment methods are accepted for BC337-025?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337-025 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337-025?

BC337-025 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337-025 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 BC337-025?

For technical support, including BC337-025 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337-025 requirements.

6.How does Aetrix verify that BC337-025 is sourced from the original manufacturer or authorized distributors?

All BC337-025 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 BC337-025 meets industry standards.

7.What is the process for return or replacement of BC337-025?

All BC337-025 units undergo pre-shipment inspection (PSI). If there is an issue with BC337-025, 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 BC337-025 part is unused and in its original packaging.

Return procedure for BC337-025:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 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…

2026-09-02 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…