onsemi BC489

Overview

BC489RL1G from onsemi is an NPN silicon general-purpose transistor in TO-92 package, rated for 80 V_CEO, 500 mA continuous collector current, and 1.5 W power dissipation at T_A = 25°C. It delivers h_FE = 100–160 (at I_C = 100 mA), V_CE(sat) ≤ 0.3 V (I_C = 500 mA, I_B = 50 mA), and f_T = 200 MHz - suitable for medium-power linear amplification and switching in industrial control interfaces.

For engineers reviewing the BC489RL1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V breakdown rating, Pb-free TO-92 packaging, 200 MHz gain-bandwidth product, low saturation voltage under 500 mA load, and thermal resistance of 83.3°C/W junction-to-case - critical for thermally constrained PCB layouts.

Technical Context

The BC489RL1G operates as a discrete NPN bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for DC amplification and moderate-speed switching. Its h_FE variation across I_C = 10 mA to 1 A reflects design trade-offs between gain linearity and saturation performance, while its 7.0 pF output capacitance (C_ob) and 50 pF input capacitance (C_ib) constrain high-frequency small-signal use above ~50 MHz.

Thermal design relies on its R_JA = 200°C/W (free-air) and R_JC = 83.3°C/W ratings, enabling operation up to +150°C junction temperature when mounted on thermally adequate copper land. The device exhibits negative base-emitter voltage temperature coefficient (−2.4 mV/°C), requiring bias network compensation in precision analog stages.

Key Specifications

Pinout & Package

BC489RL1G uses the standard TO-92 (Case 29-11, Style 17) plastic package with 3 leads: Collector (Pin 1), Base (Pin 2), Emitter (Pin 3). Pin 1 is identified by the tab or microdot marking; lead spacing is 2.54 mm (0.100 inch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC547C and MPSA42, BC489RL1G occupies a mid-range niche: it exceeds BC547C's voltage and current capability while offering superior saturation performance versus MPSA42 - making it optimal for 24–48 V industrial switching where both robustness and efficiency matter.

Availability

BC489RL1G is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor speed control, LED array power switches, and analog signal amplifiers requiring stable component supply across long-lifecycle embedded programs.

Supply support for BC489RL1G 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 supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The BC489RL1G belongs to onsemi's legacy high-current general-purpose transistor family, designed for cost-sensitive, thermally constrained industrial control and interface circuits requiring reliable 500 mA switching with 80 V tolerance.

FAQ

What is the maximum collector-emitter voltage rating for BC489RL1G?

The BC489RL1G has a guaranteed minimum V_(BR)CEO of 80 Vdc at I_C = 10 mA, with no degradation up to the absolute maximum rating. This allows safe operation with 60 V DC rails and transient suppression margins in industrial power supplies and motor controls. Derating is not required below 80 V, but thermal limits must still be observed per the R_JA specification.

Is BC489RL1G pin-compatible with other TO-92 NPN transistors like BC547 or 2N2222?

BC489RL1G uses the standard TO-92 pinout (Collector-Base-Emitter on Pins 1-2-3), matching BC547 and 2N2222 mechanically and electrically for basic replacement. However, its higher V_CEO (80 V vs. 45 V/40 V) and 1.5 W power rating mean it can safely substitute in higher-voltage or higher-current roles - but circuit biasing must be verified due to h_FE differences across variants.

Does BC489RL1G support Pb-free soldering processes?

Yes, BC489RL1G is explicitly marked as Pb-free in the ordering information and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. It is qualified for standard lead-free reflow profiles with peak temperatures up to 260°C, and its TO-92 package meets IPC/JEDEC standards for thermal cycling reliability after assembly.

What is the typical current gain (h_FE) of BC489RL1G at 100 mA collector current?

The BC489RL1G corresponds to the BC489B variant per onsemi's marking convention (x = B), delivering h_FE = 160–400 at I_C = 100 mA and V_CE = 2.0 V. This wide range reflects manufacturing spread; design margining should assume h_FE ≥ 160 for saturation assurance and ≥ 100 for linear amplifier stability.

Can BC489RL1G be used in high-frequency amplifier applications?

The BC489RL1G has an f_T of 200 MHz, but its 50 pF input capacitance (C_ib) and 7 pF output capacitance (C_ob) limit practical small-signal amplification to ≤ 50 MHz. It is best suited for RF driver stages or broadband pre-amplifiers below 30 MHz; for >100 MHz applications, dedicated RF transistors with lower C_ob and optimized geometry are recommended.