onsemi BC337-25RL1G

Overview

BC337-25RL1G from onsemi is an NPN general-purpose bipolar junction transistor (BJT) with 45 V V_CEO, 800 mA I_C, DC current gain (h_FE) of 250–630 at I_C = 100 mA, and a maximum power dissipation of 625 mW in the SOT-23 package. It serves as a medium-current switch or linear amplifier in low-voltage control circuits, commonly used in relay drivers, LED drivers, and signal buffering.

For engineers reviewing the BC337-25RL1G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE range, SOT-23 thermal performance, V_CEO/I_C derating behavior, and compatibility with 3.3 V/5 V logic-level drive.

Technical Context

The BC337-25RL1G is part of the BC337 family, differentiated by its h_FE bin (250–630), and shares identical absolute maximum ratings and electrical characteristics with other variants except for current gain distribution. It operates in active, saturation, and cutoff regions with defined V_BE(sat) ≤ 1.2 V at I_C/I_B = 500 mA/50 mA.

Its SOT-23 package enables surface-mount integration in space-constrained PCBs, and its complementary PNP counterpart is BC327-25. The device meets JEDEC JESD22-A114 reliability standards and is rated for operation from –55 °C to +150 °C junction temperature.

Key Specifications

Pinout & Package

BC337-25RL1G is housed in a JEDEC-standard SOT-23 (TO-236AB) plastic surface-mount package with gull-wing leads, optimized for automated assembly and moderate thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC337-40RL1G and MMBT3904LT1G, the BC337-25RL1G offers balanced h_FE and current capability for mid-range switching-neither over-engineered nor under-specified-making it optimal for relay, LED, and level-shifting tasks requiring proven 800 mA handling and stable gain.

Availability

BC337-25RL1G is available at Aetrix Electronics and suitable for relay drivers, LED current switches, signal level shifters, and audio pre-amplifier stages requiring stable component supply across industrial, consumer, and automotive-qualified production programs.

Supply support for BC337-25RL1G 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 BC337-25RL1G belongs to onsemi's General Purpose Transistors product line, engineered for reliable, cost-effective discrete switching and amplification in mainstream electronic systems where performance consistency and manufacturability are critical.

FAQ

What is the maximum continuous collector current rating for BC337-25RL1G?

The BC337-25RL1G has a maximum continuous collector current (I_C) rating of 800 mA at T_A = 25 °C. This value decreases with rising ambient temperature due to thermal derating; the datasheet specifies a linear derating factor of 5.0 mA/°C above 25 °C. For sustained 800 mA operation, board-level thermal design must maintain case temperature within limits. The BC337-25RL1G is not intended for pulsed or intermittent duty beyond this rating without verification.

Does BC337-25RL1G have a specified avalanche rating?

No, the BC337-25RL1G does not feature a rated avalanche energy (E_AS) or single-pulse avalanche capability in its official onsemi datasheet. It is designed for linear and switching operation within its absolute maximum ratings (e.g., V_CEO ≤ 45 V, I_C ≤ 800 mA). Applications subject to inductive kickback or voltage transients require external clamping (e.g., flyback diode) to prevent breakdown. The BC337-25RL1G relies on safe operating area (SOA) compliance-not avalanche ruggedness-for reliability.

Is BC337-25RL1G RoHS compliant and lead-free?

Yes, BC337-25RL1G is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and onsemi's Pb-free packaging standards. The device uses matte tin (Sn) lead finish on its SOT-23 terminals and contains no intentionally added lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). Full material declarations and test reports are available through onsemi's compliance portal.

Can BC337-25RL1G replace BC337-25 in through-hole designs?

No, BC337-25RL1G cannot directly replace through-hole BC337-25 (TO-92 package) without PCB redesign. Although both share identical electrical specifications and h_FE bin, the BC337-25RL1G uses an SOT-23 surface-mount package with different footprint, soldering profile, and thermal path. Substitution requires layout changes, requalification of thermal performance, and validation of assembly process compatibility. The BC337-25RL1G is not a drop-in replacement for TO-92 versions.

What is the typical V_BE(on) of BC337-25RL1G at I_C = 100 mA?

The typical base-emitter turn-on voltage (V_BE(on)) of BC337-25RL1G is 0.77 V at I_C = 100 mA and V_CE = 1 V, per onsemi's datasheet. This value increases slightly with higher current and decreases with temperature. Designers should use 0.7 V–0.85 V as the practical range for base resistor calculations. The BC337-25RL1G exhibits consistent V_BE behavior across its h_FE bin, supporting repeatable biasing in production.