STMicroelectronics 2STX2220

Overview

2STX2220 from STMicroelectronics is a PNP bipolar power transistor using PB-HDC technology, designed for high-gain, low-saturation switching in portable power management. It delivers h_FE ≥ 120 at I_C = −1.5 A, V_CE(sat) = −0.45 V at I_C = −1.5 A / I_B = −150 mA, −20 V V_CEO, and 0.9 W total dissipation in TO-92 package - used in battery charger switching regulators.

For engineers reviewing the 2STX2220 datasheet, 2STX2220 pinout, 2STX2220 application, or 2STX2220 equivalent, key selection criteria include verified V_CE(sat) performance at 1.5 A, DC current gain stability across 100 mA–1.5 A, thermal resistance (R_thj-amb = 139 °C/W), and TO-92 mechanical compatibility with legacy PCB layouts.

Technical Context

This PNP transistor employs ST's PB-HDC (Power Bipolar High Density Current) process to achieve simultaneous high current gain and low saturation voltage - a trade-off traditionally difficult in standard bipolar processes. Its −20 V V_CEO and −5 V V_EBO ratings support operation in low-voltage battery-fed systems up to 12 V rail.

The device is optimized for resistive-load switching (t_on = 60 ns, t_off = 250 ns at −1.5 A), with guaranteed h_FE ≥ 75 at full rated current and C_CBO = 30 pF at −10 V, enabling stable performance in DC-DC converter output stages and linear pass elements.

Key Specifications

Pinout & Package

Supplied in JEDEC-standard TO-92 plastic package (ECOPACK® compliant, lead-free second-level interconnect). Dimensions per ST mechanical drawing: D ≈ 4.7 mm, E ≈ 3.6 mm, L ≈ 14.1 mm, e = 2.54 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD2955T4 and BC807-40, the 2STX2220 uniquely balances TO-92 form factor, 1.5 A capability, and sub-0.5 V saturation - making it irreplaceable in compact, medium-current PNP switching where thermal and spatial constraints preclude TO-220 or SOT-23 solutions.

Availability

2STX2220 is available at Aetrix Electronics and suitable for portable battery charger designs, linear regulator pass elements, high-side load switches, and DC-DC converter output stages requiring stable component supply and long-term manufacturability.

Supply support for 2STX2220 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs and discrete power devices for industrial, automotive, and consumer markets.

The 2STX series belongs to ST's legacy bipolar power transistor family, engineered specifically for cost-sensitive, medium-current linear and switching power applications in portable and battery-powered equipment.

FAQ

What is the maximum continuous collector current for the 2STX2220?

The 2STX2220 is rated for −1.5 A continuous collector current at T_amb = 25°C with no heatsink. Derating is required above 25°C ambient per R_thj-amb = 139 °C/W; at 70°C ambient, maximum continuous I_C drops to approximately −0.9 A to maintain T_J ≤ 150°C.

Does the 2STX2220 support surface-mount assembly?

No - the 2STX2220 is exclusively offered in through-hole TO-92 package (bulk packing). It lacks SMD variants such as SOT-89 or DPAK. For automated assembly, wave soldering or manual insertion is required; reflow is not applicable due to package construction and thermal limits.

What is the typical V_CE(sat) at 1.5 A collector current?

Per ST's datasheet (Rev 2, p.4), V_CE(sat) is −0.45 V maximum at I_C = −1.5 A and I_B = −150 mA, measured at T_case = 25°C. Typical value is not specified, but production testing guarantees compliance with this max limit across all units.

Can the 2STX2220 replace the 2N2907A in existing designs?

Only with verification: while both are PNP TO-92 transistors, the 2STX2220 offers higher I_C (−1.5 A vs. −600 mA), lower V_CE(sat) (−0.45 V vs. −1.6 V), and higher h_FE (≥120 vs. 100), but has lower V_CEO (−20 V vs. −60 V). Replacement is viable only if system voltage stays ≤20 V and thermal margin allows increased power density.