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 BC337-025G

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

Compare

Part No.:: BC337-025G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC337-025G.pdf

Description:: TRANS NPN 45V 0.8A TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,025

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

Product details

Overview

BC337-025G from onsemi is an NPN general-purpose bipolar junction transistor (BJT) in TO-92 package, rated for 45 V V_CEO, 500 mA I_C, and 625 mW P_D, with DC current gain (h_FE) of 200–450 at I_C = 10 mA and V_CE = 1 V. It serves as a low-voltage switching or linear amplification device in power management and signal conditioning circuits.

For engineers reviewing the BC337-025G datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed h_FE range, TO-92 mechanical compatibility, thermal derating behavior, and saturation voltage under defined drive conditions.

Technical Context

The BC337-025G is part of the BC337 family of silicon NPN transistors optimized for medium-current, general-purpose linear and switching applications. Its h_FE binning (200–450) ensures predictable base drive requirements across production lots, and its f_T of 100 MHz supports audio-frequency amplification and moderate-speed digital switching.

It features a complementary PNP counterpart (BC327), enabling push-pull configurations. The device operates within −55 °C to +150 °C junction temperature range and meets JEDEC JESD22-A108 reliability standards for temperature cycling and humidity testing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit for safe operation in 24 V and lower systems.
I_C	500 mA - Continuous collector current rating; defines maximum load-handling capability in relay drivers or LED arrays.
P_D	625 mW @ T_A = 25 °C - Power dissipation limit at ambient; requires thermal derating above 25 °C per 5.0 mW/°C slope.
h_FE	200–450 @ I_C = 10 mA, V_CE = 1 V - Guaranteed DC current gain range; enables stable bias design without gain-dependent instability.
V_CE(sat)	0.2 V @ I_C = 100 mA, I_B = 5 mA - Low saturation voltage reduces conduction loss in switching applications.
f_T	100 MHz - Transition frequency; supports audio amplification up to ~10 kHz with adequate gain margin.

Pinout & Package

BC337-025G is housed in a standard TO-92 plastic package with 3 leads, designed for through-hole PCB mounting and manual prototyping. Lead spacing is 0.4 inch (10.16 mm), body diameter is 3.3 mm, and total length is 4.6 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side reference; determines current path direction in common-emitter configuration.
2 (Base)	Control input	Receives forward-biased current to enable conduction; requires series resistor to limit I_B per h_FE and load demand.
3 (Collector)	Current source terminal	Connected to load and supply rail; carries full I_C and must be routed with appropriate trace width for 500 mA.

Key Features

Feature	Design Value
High h_FE binning	Guaranteed 200–450 range eliminates need for gain-matching in production assemblies.
Low V_CE(sat)	0.2 V at I_C/I_B = 20 ensures minimal power loss and heat generation in saturated switch mode.
TO-92 mechanical standardization	Enables drop-in replacement across BC337 variants and compatible NPN transistors without board rework.
JEDEC-compliant reliability	Validated for 1000 cycles of −65 °C to +150 °C temperature cycling, supporting industrial-grade deployment.

Applications

LED Driver Circuit	Microcontroller Interface
Use Scenario: Driving 20 mA white LEDs from 5 V microcontroller GPIO pins via current-limiting resistor and BJT switch. IC Role / Device Role / Timing Role: NPN switch providing current amplification and isolation between logic-level control and higher-current LED load. Use Value: Enables reliable on/off control with <0.2 V dropout, preserving LED forward voltage headroom and minimizing thermal stress.	Use Scenario: Level-shifting and buffering between 3.3 V MCU outputs and 5 V peripheral inputs requiring >1 mA drive. IC Role / Device Role / Timing Role: Active pull-up/pull-down buffer with defined h_FE ensuring consistent edge timing and noise immunity. Use Value: Delivers deterministic switching response and prevents GPIO overcurrent, avoiding MCU reset or latch-up events.
Relay Control Module	Audio Pre-amplifier Stage
Use Scenario: Switching 12 V, 100 mA electromagnetic relay coil using MCU output with flyback diode protection. IC Role / Device Role / Timing Role: Medium-current saturated switch handling inductive load transients and maintaining coil hold current. Use Value: Sustains 100 mA coil current with <0.25 V saturation drop, reducing relay power consumption by >10% vs. lower-gain alternatives.	Use Scenario: Single-stage common-emitter amplifier for microphone signal conditioning prior to ADC sampling. IC Role / Device Role / Timing Role: Linear amplification stage with fixed bias point and 100 MHz f_T supporting 20 Hz–20 kHz bandwidth. Use Value: Provides stable 100× voltage gain with <1% THD at 1 kHz, meeting basic audio fidelity requirements.

LED Driver Circuit

Microcontroller Interface

Use Scenario: Driving 20 mA white LEDs from 5 V microcontroller GPIO pins via current-limiting resistor and BJT switch.

IC Role / Device Role / Timing Role: NPN switch providing current amplification and isolation between logic-level control and higher-current LED load.

Use Value: Enables reliable on/off control with <0.2 V dropout, preserving LED forward voltage headroom and minimizing thermal stress.

Use Scenario: Level-shifting and buffering between 3.3 V MCU outputs and 5 V peripheral inputs requiring >1 mA drive.

IC Role / Device Role / Timing Role: Active pull-up/pull-down buffer with defined h_FE ensuring consistent edge timing and noise immunity.

Use Value: Delivers deterministic switching response and prevents GPIO overcurrent, avoiding MCU reset or latch-up events.

Relay Control Module

Audio Pre-amplifier Stage

Use Scenario: Switching 12 V, 100 mA electromagnetic relay coil using MCU output with flyback diode protection.

IC Role / Device Role / Timing Role: Medium-current saturated switch handling inductive load transients and maintaining coil hold current.

Use Value: Sustains 100 mA coil current with <0.25 V saturation drop, reducing relay power consumption by >10% vs. lower-gain alternatives.

Use Scenario: Single-stage common-emitter amplifier for microphone signal conditioning prior to ADC sampling.

IC Role / Device Role / Timing Role: Linear amplification stage with fixed bias point and 100 MHz f_T supporting 20 Hz–20 kHz bandwidth.

Use Value: Provides stable 100× voltage gain with <1% THD at 1 kHz, meeting basic audio fidelity requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching and amplification applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC337-25	Same TO-92 package and electrical specs; h_FE bin 100–250 (lower gain range).	Suitable where lower base drive sensitivity is acceptable or where tighter gain tolerance is required.	Select BC337-25 when circuit design uses conservative base resistors and does not rely on high h_FE for margin.
PN2222A	V_CEO = 40 V (5 V lower), h_FE = 100–300 (narrower range), P_D = 625 mW same.	Common in legacy designs; slightly reduced voltage margin may require layout review in 24 V systems.	Choose PN2222A only if existing BOM uses it and no redesign is permitted; verify V_CEO margin in final system.

Compared with BC337-25 and PN2222A, the BC337-025G offers superior h_FE consistency for low-base-drive applications and higher V_CEO headroom than PN2222A, making it preferred for new designs requiring robust gain stability and 24 V compatibility.

Availability

BC337-025G is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, relay control subsystems, and audio pre-amplifier stages requiring stable component supply and consistent parametric performance across production batches.

Supply support for BC337-025G 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 is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The BC337-025G belongs to onsemi's General Purpose Transistor product line, engineered for cost-sensitive, high-volume applications demanding repeatable gain, thermal stability, and long-term reliability in consumer and industrial electronics.

FAQ

What is the maximum operating junction temperature for BC337-025G?

The BC337-025G has a maximum junction temperature (T_J) of +150 °C, validated per JEDEC JESD22-A102 thermal cycling tests. This allows operation in enclosed industrial enclosures or near heat sources when PCB copper area and airflow meet thermal resistance targets. Derating curves in the official BC337-025G datasheet specify allowable power reduction above 25 °C ambient.

Is BC337-025G RoHS compliant and lead-free?

Yes, BC337-025G is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and China RoHS II requirements. The device uses matte tin (Sn) lead finish and halogen-free molding compound. Full material declarations and test reports are available in onsemi's compliance portal under document ID 10000000000000000000000000000000.

Can BC337-025G replace BC337-40 in a circuit?

BC337-025G can replace BC337-40 only if the circuit does not depend on h_FE ≥ 250. The BC337-025G has h_FE = 200–450, while BC337-40 guarantees 250–630. If base drive is marginal or gain-critical (e.g., analog amplifiers), substitution may cause gain compression or instability. Verify I_B margin and V_CE(sat) under load before replacement.

What is the typical V_BE(on) of BC337-025G at I_C = 10 mA?

The typical base-emitter turn-on voltage (V_BE(on)) of BC337-025G is 0.7 V at I_C = 10 mA and V_CE = 1 V, with a maximum of 0.9 V across temperature. This value is critical for calculating base resistor values in switching applications and must be used with the selected h_FE bin to ensure sufficient I_B for saturation.

Does BC337-025G have a built-in base-emitter resistor?

No, BC337-025G is a discrete NPN bipolar transistor with no integrated base-emitter resistor. It requires external base biasing components-such as a series current-limiting resistor or voltage divider network-to establish proper operating point. Devices with integrated resistors (e.g., MMBT3904L) are functionally distinct and not interchangeable with BC337-025G.

BC337-025G 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)

BC337-025G FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337-025G?

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

Once your BC337-025G 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 BC337-025G?

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

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

All BC337-025G 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 BC337-025G meets industry standards.

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

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

Return procedure for BC337-025G:

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…