onsemi PZT2222A

Overview

PZT2222A from Fairchild Semiconductor is an NPN general-purpose amplifier transistor in SOT-223 package, rated for 40 V V_CEO, 1.0 A I_C, and 1000 mW power dissipation at 25°C, used as a medium-power switch or linear amplifier in industrial control and power management circuits.

For engineers reviewing the PZT2222A datasheet, pinout, applications, or equivalent options, key selection criteria include its 125°C maximum junction temperature, 150 mA h_FE minimum at I_C = 150 mA, V_CE(sat) ≤ 1.0 V at 500 mA, f_T = 300 MHz, and SOT-223 thermal performance with R_θJA = 125°C/W on specified PCB layout.

Technical Context

The PZT2222A operates as a silicon NPN bipolar junction transistor optimized for medium-current switching and analog amplification. Its design supports DC current gain (h_FE) from 100 to 300 across I_C = 0.1–500 mA, with V_BE(sat) ≤ 1.2 V and V_CE(sat) ≤ 1.0 V under high-current saturation conditions.

Thermal behavior is defined by R_θJA = 125°C/W on a 36 mm × 18 mm FR-4 board with ≥6 cm² collector pad, enabling stable operation up to 150°C junction temperature. Switching performance includes t_d = 10 ns, t_r = 25 ns, t_s = 225 ns, and t_f = 60 ns at I_C = 150 mA, supporting moderate-speed digital and PWM applications.

Key Specifications

Pinout & Package

SOT-223 package with exposed collector tab for thermal enhancement; standardized 4-pin outline (3 active + 1 thermal pad), lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT2222A and PN2222A, the PZT2222A delivers superior thermal performance and higher continuous current capability in SMT form factor, making it optimal for production-grade industrial power switching where reliability and power density are prioritized.

Availability

PZT2222A is available at Aetrix Electronics and suitable for industrial motor control, LED lighting drivers, PLC power sequencing, and sensor interface circuits requiring stable component supply and long-term manufacturability.

Supply support for PZT2222A 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete solutions before its acquisition by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial systems.

The PZT2222A belongs to Fairchild's general-purpose bipolar transistor family designed for cost-sensitive, medium-power amplification and switching in industrial, consumer, and computing applications.

FAQ

What is the maximum continuous collector current rating for the PZT2222A?

The PZT2222A is rated for 1.0 A absolute maximum collector current, but its recommended continuous operating limit is 500 mA under typical thermal conditions. At 500 mA, V_CE(sat) remains ≤ 1.0 V and h_FE stays ≥ 50, ensuring predictable switching and gain behavior. Derating is required above 25°C ambient per the 8.0 mW/°C specification.

Does the PZT2222A have a built-in ESD protection diode?

No, the PZT2222A does not integrate ESD protection diodes. It is a bare-die bipolar transistor with standard junction isolation. System-level ESD protection-such as series resistors or external TVS devices-must be implemented on the base and collector lines per IEC 61000-4-2 Level 2 requirements if used in exposed interfaces.

Can the PZT2222A replace the PN2222A in an existing TO-92 design?

No, the PZT2222A cannot directly replace the PN2222A without PCB redesign. The PZT2222A uses SOT-223 packaging with different pinout (E-B-C-tab), larger footprint, and thermal pad requirements, whereas PN2222A is TO-92 with axial leads. Electrical compatibility exists, but mechanical and thermal integration are incompatible.

What is the typical noise figure of the PZT2222A at 1 kHz?

The PZT2222A has a typical noise figure of 4.0 dB at I_C = 100 μA, V_CE = 10 V, R_S = 1.0 kΩ, and f = 1.0 kHz. This value is measured under small-signal linear conditions and applies to low-noise preamplifier stages; noise increases significantly at higher collector currents due to shot noise dominance.

Is the PZT2222A RoHS compliant and lead-free?

Yes, the PZT2222A is RoHS compliant and manufactured with lead-free terminations per JEDEC J-STD-609. The SOT-223 package uses matte tin plating over copper leadframe, and the device meets exemption 7a for lead in high-melting-temperature type solders, confirmed in Fairchild's original Rev. 1.0.0 datasheet.