onsemi 2N4919G

Overview

2N4919G from onsemi is a medium-power plastic PNP silicon transistor designed for switching and driver applications in industrial power control circuits, with V_CEO = 60 V, I_C = 1.0 A (JEDEC), P_D = 30 W at T_C = 25°C, and V_CE(sat) ≤ 0.6 V at I_C = 1.0 A / I_B = 0.1 A.

For engineers reviewing the 2N4919G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, TO-225 package layout, safe operating area limits, thermal resistance data, and validated alternative transistors for driver-stage replacement in legacy power systems.

Technical Context

The 2N4919G operates as a general-purpose PNP bipolar junction transistor optimized for linear amplification and hard-switching duty in DC-DC converters, relay drivers, and motor control stages. Its gain is specified across three current levels (50 mA, 500 mA, 1.0 A), and it maintains f_T ≥ 3.0 MHz under small-signal conditions.

Thermal design is supported by R_θJC = 4.16°C/W max and defined derating curves - power dissipation drops linearly above 25°C case temperature at 0.24 W/°C. The device exhibits second-breakdown-limited SOA up to 100 µs pulses and bonding-wire-limited conduction at high I_C.

Key Specifications

Pinout & Package

2N4919G is housed in a TO-225 (Case 077, Style 1) plastic package with external leads and a backside metal tab for mechanical mounting and thermal conduction. Pin numbering follows standard front-view orientation: Pin 1 = Emitter, Pins 2 & 4 = Collector (internally connected), Pin 3 = Base.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N4919G, MJD2955G offers scalable power capacity for next-generation loads, while 2N4920G extends voltage headroom without altering footprint or biasing - both preserve compatibility in driver-stage upgrades where thermal or voltage margins are exceeded.

Availability

2N4919G is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter output stages, and motor control H-bridge legs requiring stable component supply and long-term obsolescence management.

Supply support for 2N4919G 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 power management, analog, sensors, and discrete devices for automotive, industrial, and cloud infrastructure markets.

The 2N4919G belongs to the legacy 2N4918–2N4920 series of medium-power PNP transistors engineered for ruggedized driver and switching roles in industrial control hardware where reliability and SOA robustness are critical.

FAQ

What is the maximum continuous collector current rating for the 2N4919G?

The 2N4919G has a JEDEC-specified continuous collector current rating of 1.0 A at T_C = 25°C. While its physical construction supports up to 3.0 A peak current (per SOA curves), sustained operation beyond 1.0 A requires careful thermal management and derating per the 0.24 W/°C curve. Always verify junction temperature using R_θJC = 4.16°C/W and ambient conditions.

Is the 2N4919G pin-compatible with other transistors in the 2N4918–2N4920 series?

Yes, the 2N4919G shares identical TO-225 (Case 077, Style 1) packaging and pinout - Pin 1 = Emitter, Pins 2 & 4 = Collector, Pin 3 = Base - with all members of the 2N4918–2N4920 family. This allows direct substitution within the same voltage class, though V_CEO and V_CBO differ between 2N4918 (40 V), 2N4919G (60 V), and 2N4920G (80 V).

Does the 2N4919G have Pb-free construction?

Yes, the "G" suffix in 2N4919G explicitly denotes a Pb-free (RoHS-compliant) package per onsemi's marking convention. It uses lead-free terminations and complies with J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount reflow processing.

What is the safe operating area (SOA) limitation for the 2N4919G at 60 V?

At V_CE = 60 V, the 2N4919G's SOA is limited to approximately 1.0 A for DC operation and up to 3.0 A for pulse widths ≤ 100 µs, as shown in Figure 5 of the datasheet. Operation beyond these boundaries risks second breakdown or thermal runaway - always reference the normalized r(t) thermal curves and apply appropriate derating for case temperature.

Can the 2N4919G be used as a direct replacement for the 2N4918 or 2N4920?

The 2N4919G is electrically and mechanically compatible with 2N4918 and 2N4920 - same package, pinout, and gain structure - but differs in voltage ratings: 2N4918 supports 40 V, 2N4919G supports 60 V, and 2N4920G supports 80 V. Substituting 2N4919G for 2N4918 is safe in lower-voltage systems; substituting into 2N4920G's 80 V application risks overvoltage failure.