onsemi MPS2222G

Overview

MPS2222G from onsemi is an NPN silicon general-purpose transistor in TO-92 package, rated for 30 V_CEO, 600 mA continuous collector current, and 625 mW power dissipation at T_A = 25°C; used in low-voltage switching and amplification circuits such as signal buffering in industrial control I/O modules.

For engineers reviewing the MPS2222G datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/I_C rating margin, h_FE consistency across temperature, saturation voltage at target drive conditions, and Pb-free TO-92 mechanical compatibility with legacy board layouts.

Technical Context

The MPS2222G operates as a medium-speed, low-power NPN bipolar junction transistor optimized for linear amplification and saturated switching. Its f_T of 250 MHz supports audio-frequency and low-MHz digital signal handling, while its C_ibo = 30 pF and C_obo = 8.0 pF define small-signal input/output capacitance limits.

Thermal resistance R_JA = 200°C/W and R_JC = 83.3°C/W indicate thermal performance constraints under ambient convection cooling; derating to 5.0 mW/°C above 25°C ensures safe operation within its −55°C to +150°C junction temperature range.

Key Specifications

Pinout & Package

Package: TO-92 (Case 29-11), Pb-free, straight or bent lead options; 4.45–5.20 mm height, 4.32–5.33 mm width, 3.18–4.19 mm thickness; standardized 3-pin through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PN2222A and BC547B, the MPS2222G offers balanced 30 V/600 mA capability with industry-standard TO-92 mechanical fit and documented thermal derating-making it optimal for cost-sensitive, medium-current industrial interface circuits requiring proven reliability.

Availability

MPS2222G is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-voltage relay drivers, LED array current switches, and audio signal buffers requiring stable component supply and long-term manufacturability.

Supply support for MPS2222G 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 management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MPS2222G belongs to onsemi's general-purpose bipolar transistor product line, designed for robust, cost-effective discrete switching and amplification in non-safety-critical industrial and commercial electronics.

FAQ

What is the maximum continuous collector current rating for MPS2222G?

The MPS2222G has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating decreases linearly by 5.0 mW/°C above 25°C ambient due to its 625 mW total device dissipation limit. At 75°C ambient, the usable I_C drops to approximately 450 mA under natural convection cooling, assuming standard PCB copper area.

Is MPS2222G pin-compatible with the classic 2N2222A?

Yes, the MPS2222G uses the same TO-92 package and identical pinout (Emitter-Base-Collector on pins 1-2-3) as the 2N2222A, enabling direct replacement in existing layouts. However, the MPS2222G specifies V_CEO = 30 V versus 2N2222A's 40 V, so system-level voltage margin verification is required before substitution.

Does MPS2222G meet RoHS requirements?

Yes, the MPS2222G is explicitly marked as Pb-free in the ordering information and complies with EU RoHS Directive 2011/65/EU. Its TO-92 package uses lead-free terminations and conforms to onsemi's Pb-free manufacturing standards, verified per J-STD-609.

What is the typical noise figure of MPS2222G in audio preamplifier use?

The MPS2222G has a maximum noise figure (NF) of 4.0 dB when operated at I_C = 100 µA, V_CE = 10 V, R_S = 1.0 kΩ, and f = 1.0 kHz. This value is measured under standardized small-signal conditions and makes the MPS2222G suitable for low-noise microphone buffer stages where SNR preservation is critical.

Can MPS2222G be used in switching applications above 1 MHz?

The MPS2222G has an f_T of 250 MHz, but its practical switching bandwidth is limited by storage time (t_s ≤ 225 ns) and fall time (t_f ≤ 60 ns). It is suitable for repetitive switching up to ~2 MHz in well-designed circuits with optimized base drive; for >5 MHz operation, a faster RF transistor like MMBT2222A is recommended.