onsemi 2N2219A

Overview

2N2219A from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor designed for medium-power amplification and switching applications, with 40 V V_CEO, 1.0 A continuous collector current, and TO-226AE (TO-18 equivalent) metal-can package; used in linear audio preamplifiers, relay drivers, and pulse-width modulation circuits.

For engineers reviewing the 2N2219A datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO voltage ratings, h_FE gain consistency across 0.1–500 mA, saturation voltage at defined I_B/I_C ratios, thermal resistance (R_θJA = 50 °C/W), and TO-226AE mechanical compatibility.

Technical Context

The 2N2219A operates as a single NPN BJT with fixed emitter-base and collector-base junction structures optimized for analog amplification and hard-switching duty. Its DC current gain (h_FE) ranges from 35 to 300 depending on collector current (0.1 mA to 500 mA) and V_CE, while small-signal h_fe reaches 375 at 10 mA/10 V.

Switching performance is characterized by 10 ns delay, 25 ns rise, 225 ns storage, and 60 ns fall times under specified 150 mA load conditions; noise figure is 4.0 dB at 100 µA, making it suitable for low-noise front-end stages where gain stability and thermal robustness are prioritized over RF bandwidth.

Key Specifications

Pinout & Package

2N2219A uses the TO-226AE (metal-can, 3-lead) package with standardized lead orientation: flat side facing viewer, leads downward, left-to-right pin order is Emitter (1), Base (2), Collector (3). Case is electrically connected to Collector.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2N2222A and PN2222A, the 2N2219A delivers superior thermal performance and tighter h_FE distribution at mid-current levels-critical for stable bias in production amplifiers and robust switching in industrial controls where long-term parametric drift must be minimized.

Availability

2N2219A is available at Aetrix Electronics and suitable for audio preamplifiers, relay interface circuits, and DC motor drivers requiring stable component supply, consistent gain matching, and proven thermal reliability in through-hole manufacturing.

Supply support for 2N2219A 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 manufacturer specializing in discrete power devices, analog ICs, and interface solutions before its acquisition by ON Semiconductor in 2016.

The 2N2219A belongs to Fairchild's legacy general-purpose BJT family engineered for industrial-grade reliability, wide temperature operation (−55 °C to +150 °C), and compatibility with established through-hole assembly processes.

FAQ

What is the maximum continuous collector current rating for the 2N2219A?

The 2N2219A has a maximum continuous collector current (I_C) rating of 1.0 A at T_A = 25 °C. This rating assumes proper heatsinking and derating per the 8.0 mW/°C thermal derating curve above 25 °C ambient. At elevated temperatures or without heatsinking, practical limits drop significantly-e.g., ~500 mA at 70 °C ambient. The 2N2219A datasheet specifies this value under steady-state DC conditions, not pulsed operation.

Is the 2N2219A pin-compatible with the 2N2222A?

Yes, the 2N2219A is mechanically and electrically pin-compatible with the 2N2222A in the TO-226AE package: both use identical E-B-C lead order and case-connected collector. However, the 2N2219A offers higher minimum h_FE (100 vs. 75 at 150 mA) and lower R_θJA (50 vs. 62.5 °C/W), making it a direct functional upgrade in existing 2N2222A designs where gain stability or thermal margin is critical. The 2N2219A remains fully compatible with legacy 2N2222A footprints and schematics.

What is the typical noise figure of the 2N2219A and at what conditions is it measured?

The 2N2219A has a typical noise figure (NF) of 4.0 dB, measured at I_C = 100 µA, V_CE = 10 V, R_S = 1.0 kΩ, f = 1.0 kHz, and BW = 1.0 kHz. This low-noise performance makes the 2N2219A suitable for high-gain, low-level signal amplification stages such as microphone preamps or sensor interfaces. The 2N2219A achieves this value due to optimized emitter-base junction geometry and low base resistance, confirmed in Fairchild's official characterization data.

Can the 2N2219A be used in switching applications, and what are its key timing parameters?

Yes, the 2N2219A is qualified for switching use with documented timing parameters: delay time (t_d) = 10 ns, rise time (t_r) = 25 ns, storage time (t_s) = 225 ns, and fall time (t_f) at I_C = 150 mA, V_CC = 30 V, and I_B1 = I_B2 = 15 mA. These values confirm suitability for pulse generation, relay driving, and PWM up to ~1 MHz. The 2N2219A's relatively long storage time reflects its non-speed-optimized BJT structure, so it is best applied where switching speed is secondary to gain and ruggedness.

What is the package type and thermal resistance of the 2N2219A?

The 2N2219A uses the TO-226AE (metal-can, 3-lead) package with collector-connected case. Its thermal resistance is R_θJA = 50 °C/W (junction-to-ambient) and R_θJC = 125 °C/W (junction-to-case) at T_A = 25 °C. This allows up to ~1.0 W dissipation with adequate heatsinking. The 2N2219A's metal-can construction provides superior thermal transfer versus plastic packages like TO-92, enabling higher reliability in sustained medium-power operation.