onsemi BC337TF

Overview

BC337TF from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor in TO-92 package, rated for 45 V V_CEO, 800 mA I_C, and 625 mW power dissipation, with h_FE of 160–400 (Class 25) and f_T = 100 MHz - used in low-power switching and audio driver stages.

For engineers reviewing the BC337TF datasheet, pinout, applications, or equivalent options, key selection factors include its V_CEO/I_C rating, h_FE classification, thermal resistance (R_θJA = 200 °C/W), TO-92 mechanical compatibility, and complementary pairing with BC327/BC328 PNP devices.

Technical Context

The BC337TF operates as a discrete bipolar junction transistor with fixed-emitter configuration, optimized for linear amplification and saturated switching in DC-coupled low-voltage circuits. Its 100 MHz f_T supports audio-frequency signal handling, while V_BE(on) = 1.2 V at I_C = 300 mA defines base drive requirements.

Designed for ambient-temperature operation up to 150 °C junction limit, it uses standard TO-92 lead form with straight leads and tape-and-reel packaging (TFR). The device exhibits low C_ob = 12 pF and V_CE(sat) = 0.7 V at I_C = 500 mA/I_B = 50 mA, enabling efficient low-side switch implementation.

Key Specifications

Pinout & Package

BC337TF is housed in a JEDEC-compliant TO-92 3-lead plastic package with straight leads and tape-and-reel (TFR) packaging. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per Fairchild/ON Semiconductor mechanical drawings and absolute maximum ratings table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC337TF, BC337-25TA offers identical performance in a different packaging format ideal for bench use, while MMBT337-TP delivers equivalent transistor characteristics in SOT-23 for high-density layouts - neither is pin-compatible, but both serve overlapping functional roles in discrete BJT applications.

Availability

BC337TF is available at Aetrix Electronics and suitable for audio amplifier drivers, low-voltage switch control, AF signal amplification, and complementary pair output stages requiring stable component supply and long-term manufacturability.

Supply support for BC337TF 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and discrete components for automotive, industrial, and consumer markets.

The BC337TF belongs to ON Semiconductor's legacy general-purpose bipolar transistor family, originally developed by Fairchild and maintained for cost-sensitive, high-reliability linear and switching applications in commercial-grade equipment.

FAQ

What is the maximum collector-emitter voltage rating for BC337TF?

The BC337TF has a maximum collector-emitter voltage rating of 45 V (V_CEO) under open-base conditions at T_A = 25 °C. This value is confirmed in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet. Exceeding this voltage risks avalanche breakdown and permanent device damage. Designers should maintain at least 20% margin below 45 V in practical applications to account for transients and temperature effects. The BC337TF is not rated for 50 V operation - that specification applies only to V_CES (with base shorted to emitter), which is less commonly used in circuit design.

Is BC337TF pin-compatible with BC337-25 or BC337-40 variants?

Yes, BC337TF is fully pin-compatible with BC337-25 and BC337-40 because all share the same TO-92 3-lead package and identical pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter. The suffix differences (-25, -40, TF) indicate h_FE classification (160–400, 250–630) and packaging type (tape-and-reel), not physical or electrical incompatibility. No PCB layout changes are needed when substituting between these variants, though gain-dependent biasing may require verification.

What is the thermal resistance (R_θJA) of BC337TF and how does it affect PCB layout?

The BC337TF has a junction-to-ambient thermal resistance of 200 °C/W on a standard FR-4 PCB (76 mm × 114 mm, 1.57 mm thick) with minimum land pattern. This means each watt of power dissipated raises the junction temperature by 200 °C above ambient. For safe operation at 625 mW, ambient must stay below ~25 °C unless copper pour or thermal vias are added. Layout best practices include maximizing copper area on the collector pad and using thermal vias to inner ground planes to reduce effective R_θJA.

Can BC337TF be used as a direct replacement for BC337-25BU in a through-hole prototype board?

Yes, BC337TF can replace BC337-25BU in through-hole prototypes because both use identical TO-92 straight-lead packages and share the same electrical specifications, including h_FE class (25), V_CEO, I_C, and pinout. The only difference is packaging: BC337TF is supplied in tape-and-reel (TFR), while BC337-25BU is bulk-packed. Once removed from reel, the devices are functionally and mechanically interchangeable - no soldering or footprint adjustments are required.

What is the typical base-emitter on voltage (V_BE(on)) for BC337TF and how does it impact base drive design?

The BC337TF exhibits a typical base-emitter on voltage of 1.2 V at V_CE = 1 V and I_C = 300 mA, as specified in the Electrical Characteristics table. This value guides base resistor selection in switch applications: for example, with a 5 V MCU GPIO driving the base, a 3.3 kΩ resistor delivers ~1.1 mA base current, sufficient to saturate the transistor at I_C ≤ 300 mA given h_FE ≥ 160. Designers should verify V_BE(on) across temperature and production lot variation during validation.