onsemi 2N6039G

Overview

2N6039G from onsemi is an NPN plastic Darlington complementary silicon power transistor designed for general-purpose amplifier and low-speed switching applications, with V_CEO = 60 Vdc, I_C = 4.0 Adc continuous, P_D = 40 W at T_C = 25°C, and h_FE ≥ 750 at I_C = 2.0 Adc - used in industrial relay drivers and linear power supply pass elements.

For engineers reviewing the 2N6039G datasheet, pinout, applications, or equivalent options, key selection criteria include safe-operating-area (SOA) limits at 5.0 ms pulse width, thermal resistance R_JC = 3.12°C/W, ESD robustness (>8 kV HBM), Pb-free TO-225 package compliance, and Darlington-level current gain without external bias network complexity.

Technical Context

The 2N6039G implements a monolithic Darlington pair structure delivering high DC current gain (h_FE up to 15,000) with integrated base-emitter shunt resistor absent - requiring external base drive control. Its SOA is second-breakdown limited at short pulses (≤5.0 ms) and thermally limited under DC conditions, with V_CE(sat) ≤ 3.0 V at I_C = 4.0 A and I_B = 40 mA.

Designed for operation across –65°C to +150°C junction temperature range, it features ESD ratings per Human Body Model Class 3B (>8,000 V) and Machine Model Class C (>400 V), and meets UL 94 V-0 flammability standard at 0.125 in thickness - confirming suitability for enclosed industrial control enclosures.

Key Specifications

Pinout & Package

2N6039G uses the TO-225 package (Case 77-09, Style 1), a 3-lead plastic power package with backside collector tab (pins 2 and 4 electrically common to collector). The package is Pb-free, RoHS-compliant, and UL 94 V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N6038G and MJ11015G, the 2N6039G uniquely balances 60 V SOA, Pb-free TO-225 packaging, and 4.0 A/40 W capability - making it optimal for space-constrained 48 V industrial controls needing regulatory compliance and moderate power density.

Availability

2N6039G is available at Aetrix Electronics and suitable for industrial relay drivers, linear power supply pass elements, motor start circuits, and DC load switches requiring stable component supply and long-term manufacturing continuity.

Supply support for 2N6039G 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, high-reliability power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The 2N6039G belongs to onsemi's legacy plastic Darlington power transistor family, engineered for cost-sensitive, thermally demanding industrial control applications where high DC gain and proven ruggedness outweigh ultra-high-frequency performance.

FAQ

What is the maximum safe collector-emitter voltage for 2N6039G?

The 2N6039G has a guaranteed V_CEO rating of 60 Vdc with base open, verified per JEDEC standards. Operation above this voltage risks avalanche breakdown and permanent damage - even brief transients exceeding 66 V must be clamped externally using TVS diodes or snubbers to protect the 2N6039G.

Can 2N6039G replace 2N6038G in existing designs?

No - the 2N6039G is not a drop-in replacement for 2N6038G. While both share the same TO-225 package and pinout, the 2N6039G is rated for 60 V V_CEO versus 40 V for the 2N6038G. Substituting 2N6039G into a 40 V design introduces unnecessary cost and may affect layout parasitics; substituting 2N6038G into a 60 V circuit violates SOA limits and risks failure of the 2N6039G-equivalent function.

What is the recommended base drive current for 2N6039G at full 4.0 A collector load?

For reliable saturation at I_C = 4.0 A, the 2N6039G requires I_B ≥ 40 mA per datasheet test condition (V_CE(sat) ≤ 3.0 V). Designers should provide 50–60 mA to accommodate h_FE variation across temperature and unit-to-unit spread - ensuring V_CE(sat) stays below 2.5 V and power dissipation remains within 40 W limits.

Does 2N6039G require a heatsink in continuous 3.0 A operation?

Yes - at I_C = 3.0 A and V_CE = 2.0 V (typical mid-saturation), power dissipation reaches ~6 W. With R_JC = 3.12°C/W and ambient at 50°C, even a modest 10°C/W heatsink is required to hold T_J below 125°C. Without heatsinking, junction temperature exceeds safe limits within seconds during continuous operation of the 2N6039G.

Is 2N6039G suitable for PWM switching above 10 kHz?

No - the 2N6039G is optimized for low-speed switching (≤1 kHz) and linear operation. Its Cob = 100 pF and relatively slow turn-off characteristics (ts + tf > 1 µs in typical circuits) cause excessive switching losses and heating above 5 kHz. For PWM applications, MOSFETs like the FQP30N06L or IGBTs with faster gate drive are preferred over the 2N6039G.