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

onsemi BC337-25RL1

Name: BC337-25RL1
Brand: onsemi
SKU: BC337-25RL1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC337-25RL1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: BC337-25RL1.pdf

Description:: TRANS NPN GP 45V 800MA TO-92

Quantity:: RFQ Add To RFQ list

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Inventory:26,000

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Product details

Overview

BC337-25RL1 from onsemi is an NPN general-purpose bipolar junction transistor (BJT) optimized for medium-current switching and linear amplification, with DC current gain (h_FE) of 160–400 at I_C = 10 mA, V_CE = 1 V, maximum collector-emitter voltage V_CEO = 45 V, continuous collector current I_C = 800 mA, and power dissipation P_D = 625 mW in TO-92 package. It is widely used in relay drivers, LED drivers, and low-speed digital logic interfaces.

For engineers reviewing the BC337-25RL1 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE range (160–400), TO-92 mechanical compatibility, safe operating area (SOA) under pulsed conditions, thermal resistance (R_θJA = 200 °C/W), and JEDEC-compliant marking and packaging.

Technical Context

The BC337-25RL1 operates as a silicon NPN BJT with epitaxial base construction, enabling stable current gain across temperature and bias conditions. Its h_FE binning ('25' suffix) specifies 160–400 at 10 mA/1 V, distinguishing it from BC337-16 (100–250) and BC337-40 (250–630).

It supports both active-mode amplification and saturation-mode switching, with typical V_CE(sat) ≤ 0.5 V at I_C = 100 mA and I_B = 5 mA, and f_T ≈ 100 MHz - sufficient for audio-frequency and low-MHz digital signal handling but not RF applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - defines maximum allowable voltage between collector and emitter with base open; sets upper limit for supply rail in switch/driver circuits.
I_C (continuous)	800 mA - maximum steady-state collector current; determines load-driving capability without forced cooling.
h_FE @ 10 mA / 1 V	160–400 - guaranteed DC current gain range for reliable base drive calculation in switching designs.
P_D (T_A = 25°C)	625 mW - total power dissipation limit at ambient temperature; constrains thermal design in enclosed PCB layouts.
V_CE(sat) @ I_C=100 mA	≤ 0.5 V - ensures low conduction loss when used as saturated switch, minimizing heat generation in driver stages.
f_T	≈100 MHz - transition frequency indicating usable bandwidth for small-signal amplification up to ~10 MHz.

Pinout & Package

BC337-25RL1 is housed in a through-hole TO-92 plastic package (JEDEC TO-92 variant), with standard lead configuration and 2.54 mm pin pitch. The package provides adequate thermal dissipation for low-to-medium power operation and supports wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-side return path in common-emitter configurations.
B (Base)	Control input	Receives forward-biased current to enable conduction; requires series resistor to limit I_B per h_FE and load requirements.
C (Collector)	Current source terminal	Connects to load and supply rail; carries full switched current; must remain within SOA during transients.

Key Features

Feature	Design Value
Guaranteed h_FE binning	160–400 at 10 mA/1 V - enables precise base resistor selection without margin overdesign.
Low V_CE(sat)	≤ 0.5 V at I_C = 100 mA - reduces power loss and self-heating in high-duty-cycle switching.
TO-92 mechanical standardization	JEDEC registered outline - ensures compatibility with legacy footprints, pick-and-place tooling, and hand-soldering fixtures.
Lead-free and RoHS compliant	Meets EU Directive 2011/65/EU - supports environmental compliance for industrial and consumer end products.

Applications

Relay Driver Circuit	LED Current Switch
Use Scenario: Driving 5–24 V DC electromagnetic relays with coil currents up to 70 mA in industrial control panels. IC Role / Device Role / Timing Role: NPN switch providing galvanic isolation between microcontroller GPIO and relay coil. Use Value: Ensures reliable turn-on with minimal base drive (I_B ≈ 0.35 mA), leveraging h_FE ≥ 160 to avoid MCU overload.	Use Scenario: Controlling indicator or status LEDs in battery-powered handheld devices with 3.3 V or 5 V supplies. IC Role / Device Role / Timing Role: Constant-current switch regulating LED brightness via base-controlled saturation. Use Value: Delivers stable 20–60 mA LED current with <1% variation across unit-to-unit and temperature drift.
Digital Logic Level Shifter	Audio Pre-amplifier Stage
Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Common-emitter inverter with pull-up resistor, providing clean voltage translation and noise margin. Use Value: Supports >1 MHz edge rates with predictable propagation delay (<50 ns) and rail-to-rail output swing.	Use Scenario: Amplifying microphone or sensor signals in analog front-end stages of voice-enabled IoT nodes. IC Role / Device Role / Timing Role: Small-signal common-emitter amplifier with emitter degeneration for linearity and stability. Use Value: Achieves >40 dB voltage gain at 1 kHz with THD <0.5%, using only passive bias components.

Relay Driver Circuit

LED Current Switch

Use Scenario: Driving 5–24 V DC electromagnetic relays with coil currents up to 70 mA in industrial control panels.

IC Role / Device Role / Timing Role: NPN switch providing galvanic isolation between microcontroller GPIO and relay coil.

Use Value: Ensures reliable turn-on with minimal base drive (I_B ≈ 0.35 mA), leveraging h_FE ≥ 160 to avoid MCU overload.

Use Scenario: Controlling indicator or status LEDs in battery-powered handheld devices with 3.3 V or 5 V supplies.

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

Use Value: Delivers stable 20–60 mA LED current with <1% variation across unit-to-unit and temperature drift.

Digital Logic Level Shifter

Audio Pre-amplifier Stage

Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Common-emitter inverter with pull-up resistor, providing clean voltage translation and noise margin.

Use Value: Supports >1 MHz edge rates with predictable propagation delay (<50 ns) and rail-to-rail output swing.

Use Scenario: Amplifying microphone or sensor signals in analog front-end stages of voice-enabled IoT nodes.

IC Role / Device Role / Timing Role: Small-signal common-emitter amplifier with emitter degeneration for linearity and stability.

Use Value: Achieves >40 dB voltage gain at 1 kHz with THD <0.5%, using only passive bias components.

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
BC337-25,113 (Nexperia)	Same h_FE bin (160–400), identical TO-92 package, but higher R_θJA (250 °C/W vs. 200 °C/W).	Suitable for same relay/LED driver roles, but derating required above 60°C ambient.	Select when sourcing flexibility is prioritized and thermal margin exists in layout.
PN2222A (ON Semiconductor)	Lower h_FE range (100–300), same V_CEO and I_C, but higher V_CE(sat) (≤ 1.2 V at I_C = 100 mA).	Acceptable for less demanding switching where base drive is abundant and efficiency less critical.	Choose only if BC337-25RL1 is unavailable and circuit tolerates higher saturation loss.

Compared with BC337-25RL1, BC337-25,113 offers identical gain and footprint but reduced thermal performance, while PN2222A trades gain consistency and lower V_CE(sat) for broader legacy availability - making BC337-25RL1 optimal for thermally constrained, gain-sensitive designs.

Availability

BC337-25RL1 is available at Aetrix Electronics and suitable for relay drivers, LED indicators, level shifters, and analog pre-amplifiers requiring stable component supply across industrial control, consumer electronics, and IoT device production.

Supply support for BC337-25RL1 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 BC337-25RL1 belongs to onsemi's General Purpose Transistors product line, engineered for cost-effective, high-reliability discrete switching and amplification in mainstream electronic systems.

FAQ

What is the guaranteed h_FE range for BC337-25RL1?

The BC337-25RL1 has a guaranteed DC current gain (h_FE) range of 160 to 400 when measured at I_C = 10 mA and V_CE = 1 V. This binning ('25') is explicitly defined in the onsemi datasheet and distinguishes BC337-25RL1 from other variants like BC337-16 or BC337-40. Designers must use this range-not typical values-to calculate worst-case base drive requirements for BC337-25RL1 in saturation.

Can BC337-25RL1 replace BC337-40 in a circuit?

No-BC337-25RL1 is not a direct replacement for BC337-40 due to its lower h_FE range (160–400 vs. 250–630). Circuits relying on high gain for marginal base drive may fail to saturate BC337-25RL1 reliably. If BC337-40 was selected for gain headroom, substituting BC337-25RL1 requires recalculating base resistor values and verifying V_CE(sat) under load for BC337-25RL1.

What is the maximum safe continuous collector current for BC337-25RL1?

The maximum continuous collector current for BC337-25RL1 is 800 mA at T_A = 25°C, as specified in the Absolute Maximum Ratings table. However, sustained operation near this limit requires careful thermal management: derating is mandatory above 25°C ambient, and actual usable I_C depends on PCB copper area, airflow, and duty cycle. For 800 mA DC loads, heatsinking or forced convection is strongly recommended.

Is BC337-25RL1 RoHS compliant and lead-free?

Yes, BC337-25RL1 is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU requirements. onsemi confirms this in the product's material composition documentation and packaging markings. The device uses matte tin (Sn) lead finish and halogen-free molding compound, supporting environmentally regulated manufacturing for commercial and industrial end equipment.

What package type does BC337-25RL1 use, and is it compatible with standard TO-92 footprints?

BC337-25RL1 uses a JEDEC-standard TO-92 plastic package with E-B-C pin order (viewed from flat side, leads down). Its dimensions, lead spacing (2.54 mm), and mounting hole pattern match industry-standard TO-92 footprints, ensuring full mechanical and assembly compatibility with existing PCB layouts, wave soldering processes, and automated placement equipment designed for TO-92 devices.

BC337-25RL1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: -

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

BC337-25RL1 FAQ

1.How can I place an order for BC337-25RL1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC337-25RL1 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 BC337-25RL1 reliable?

The price and inventory of BC337-25RL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337-25RL1 is usually 5 days.

3.What payment methods are accepted for BC337-25RL1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337-25RL1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC337-25RL1?

BC337-25RL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC337-25RL1 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 BC337-25RL1?

For technical support, including BC337-25RL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337-25RL1 requirements.

6.How does Aetrix verify that BC337-25RL1 is sourced from the original manufacturer or authorized distributors?

All BC337-25RL1 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 BC337-25RL1 meets industry standards.

7.What is the process for return or replacement of BC337-25RL1?

All BC337-25RL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC337-25RL1, 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 BC337-25RL1 part is unused and in its original packaging.

Return procedure for BC337-25RL1:

1.Submit a request within 90 days.

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

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