onsemi 2SA2222

Overview

2SA2222 from SANYO Semiconductor is a PNP epitaxial planar silicon transistor designed for high-current switching applications, featuring V_CEO = −50 V, I_C = −10 A continuous, V_CE(sat) = −250 mV at I_C = −6 A / I_B = −300 mA, f_T = 230 MHz, and TO-220ML package - used in relay drivers, lamp drivers, and motor drivers.

For engineers reviewing the 2SA2222 datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP high-current saturation performance, fast switching (t_on = 40 ns, t_f = 22 ns), thermal derating behavior (P_C = 25 W at T_c = 25°C), and MBIT process reliability in industrial load control circuits.

Technical Context

The 2SA2222 employs SANYO's MBIT (Mesa Bipolar Integrated Technology) process to achieve low V_CE(sat) and high current handling while maintaining stable h_FE (150–450 at V_CE = −2 V, I_C = −270 mA). Its −50 V V_CEO and −13 A pulsed collector rating support robust operation in inductive load switching.

Designed for DC and pulse-driven high-power switching, it delivers 230 MHz f_T with Cob = 115 pF at V_CB = −10 V, enabling reliable performance in medium-frequency motor and relay drive stages where turn-off speed (t_stg = 240 ns) and storage time control are critical.

Key Specifications

Pinout & Package

2SA2222 is housed in a TO-220ML (SANYO designation) package - a modified TO-220 variant with metal tab electrically connected to the collector and optimized thermal path for surface-mount-compatible through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-current switching applications.

Compared with 2SA2222, 2SA1943 offers greater voltage headroom but sacrifices switching speed, while MJD2955T4G matches current rating but increases conduction loss by ~4× - making 2SA2222 optimal for thermally sensitive, medium-frequency industrial switching where low V_CE(sat) and fast t_f are prioritized.

Availability

2SA2222 is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and motor drivers requiring stable component supply in industrial control, factory automation, and embedded power interface designs.

Supply support for 2SA2222 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

SANYO Semiconductor was a Japanese semiconductor manufacturer specializing in analog, power, and discrete devices before its acquisition by ON Semiconductor in 2011; known for high-reliability bipolar transistors and automotive-grade ICs.

The 2SA2222 belongs to SANYO's high-current PNP transistor product line, engineered specifically for industrial load switching where low saturation voltage, fast turn-off, and thermal robustness are essential in relay, lamp, and motor driver circuits.

FAQ

What is the maximum continuous collector current rating for the 2SA2222?

The 2SA2222 has a maximum continuous collector current (I_C) rating of −10 A at case temperature T_c = 25°C. This rating assumes proper heatsinking; derating applies above 25°C - e.g., ~0.2 A/°C reduction above T_c = 25°C. At ambient temperature (T_a = 25°C) with no heatsink, the usable I_C drops to −2 A due to its 2 W ambient-rated dissipation limit. Always refer to the PC–Tc and PC–Ta curves in the 2SA2222 datasheet for thermal design validation.

Is the 2SA2222 pin-compatible with standard TO-220 PNP transistors like the 2N2907?

No, the 2SA2222 is not pin-compatible with 2N2907 or generic TO-220 PNP transistors. While both use TO-220-outline packages, the 2SA2222 uses SANYO's TO-220ML variant with collector-connected metal tab and pin order Base–Collector–Emitter (1–2–3). The 2N2907 uses standard TO-220AB with Emitter–Base–Collector (1–2–3) ordering. Using 2SA2222 in a 2N2907 layout risks short-circuit or incorrect biasing - always verify pinout from the 2SA2222 datasheet before PCB integration.

What is the typical DC current gain (h_FE) of the 2SA2222 at operating conditions?

The 2SA2222 exhibits a typical DC current gain (h_FE) of 300 at V_CE = −2 V and I_C = −270 mA, with a guaranteed range of 150–450 under those same conditions. Gain remains stable across temperature (−25°C to +75°C) and collector current (100 mA to 1 A), supporting predictable base drive design. For high-current saturation (e.g., I_C = −6 A), h_FE drops to ~20, requiring ≥300 mA base current - confirmed in the 2SA2222's V_BE(sat) and V_CE(sat) test conditions.

Can the 2SA2222 be used in avalanche mode for inductive load protection?

No, the 2SA2222 is not rated or characterized for controlled avalanche operation. Its absolute maximum ratings specify only V_CEO = −50 V and V_CBO = −50 V - no avalanche energy (E_AS) or ruggedness data is provided in the 2SA2222 datasheet. For inductive load switching, external clamping (e.g., flyback diode across relay coil) is mandatory. Operating the 2SA2222 beyond −50 V in any mode risks irreversible junction breakdown and device failure.

Does the 2SA2222 require a minimum base resistor value in switching applications?

Yes - to ensure full saturation and avoid second breakdown, the 2SA2222 requires sufficient base drive. For I_C = −6 A, the datasheet specifies I_B = −300 mA (h_FE ≈ 20 in saturation). With V_BE(sat) = −1.2 V, a logic-level driver (e.g., 5 V TTL) needs R_B ≤ (5 V − 1.2 V) / 300 mA ≈ 12.7 Ω. Lower values (e.g., 10 Ω) improve overdrive margin. Undersized base resistors cause elevated V_CE(sat) and thermal runaway - always validate with measured 2SA2222 V_CE(sat) under actual load conditions.