STMicroelectronics 2STL2580

Overview

2STL2580 from STMicroelectronics is a high-voltage fast-switching NPN power transistor in TO-92MOD package, rated for V_CEO = 400 V, I_C = 1 A, and t_r/t_f = 140 ns/90 ns. It employs multi-epitaxial planar technology with cellular emitter structure and planar edge termination to achieve wide RBSOA and stable switching in lighting ballasts and low-cost SMPS primary-side switching.

For engineers reviewing the 2STL2580 datasheet, 2STL2580 pinout, 2STL2580 application, or 2STL2580 equivalent, key selection criteria include its 400 V V_CEO, 1 A continuous collector current, 140 ns rise time, 1.5 W P_TOT at T_amb = 25 °C, and TO-92MOD mechanical compatibility with legacy through-hole board layouts.

Technical Context

This device uses high-voltage multi-epitaxial planar process to support reliable operation up to 400 V V_CEO while maintaining fast switching (t_r = 140 ns, t_f = 90 ns) under resistive load conditions (V_CC = 200 V, I_C = 0.3 A). Its cellular emitter layout and planar edge termination jointly enable enhanced ruggedness across the reverse-biased safe operating area (RBSOA).

The transistor delivers h_FE = 60–100 at I_C = 250 mA and V_CE = 5 V, with V_CE(sat) = 1 V and V_BE(sat) = 1.1 V at I_C = 1 A / I_B = 0.2 A - parameters optimized for cost-sensitive, medium-power linear and switching applications where thermal management is constrained by TO-92MOD's R_thJA = 83 °C/W.

Key Specifications

Pinout & Package

2STL2580 is housed in TO-92MOD - a modified through-hole plastic package with 3.8 mm lead pitch, 5.8–6.2 mm body width (D), and 13.8–14.2 mm overall length (L). It features standard emitter-base-collector terminal arrangement compatible with automated insertion equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching transistor applications.

Compared with BU2520A and 2SC4027, the 2STL2580 offers balanced trade-offs: sufficient 400 V rating for universal-input adapters, 140 ns t_r for CFL ballasts, and h_FE = 60–100 that eases discrete driver design - making it optimal for cost-driven, medium-frequency, medium-power linear and switching applications.

Availability

2STL2580 is available at Aetrix Electronics and suitable for lighting ballasts, low-cost flyback SMPS, and LED driver power stages requiring stable component supply and long-term manufacturing continuity.

Supply support for 2STL2580 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The 2STL2580 belongs to ST's high-voltage bipolar transistor product line, engineered specifically for cost-sensitive, medium-power switching applications in lighting and AC-DC conversion where ruggedness, manufacturability, and thermal reliability in through-hole packages are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The 2STL2580 has a maximum operating junction temperature (T_J) of 150 °C. Operation at this limit requires strict thermal design: with R_thJA = 83 °C/W, ambient temperature must be held below 45 °C when dissipating 1.25 W to avoid exceeding T_J. Derating curves in the datasheet specify linear reduction of P_TOT above 25 °C ambient.

Can the 2STL2580 replace a MOSFET in a flyback converter primary side?

No - the 2STL2580 is a bipolar junction transistor requiring continuous base current to remain saturated, unlike voltage-driven MOSFETs. Its V_CE(sat) = 1 V at I_C = 1 A results in higher conduction loss than modern 650 V superjunction MOSFETs. It is best suited for self-oscillating or low-frequency (<60 kHz), low-cost flyback designs where gate drive complexity must be minimized.

Is the TO-92MOD package lead-free and RoHS-compliant?

Yes - the 2STL2580 is offered in ECOPACK®-compliant TO-92MOD packaging, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. ST's ECOPACK® grade definitions confirm full compliance for both bag and ammopack variants (2STL2580 and 2STL2580-AP), with lead-free matte tin plating on leads.

Does the 2STL2580 require a base resistor, and how is its value calculated?

Yes - a series base resistor is mandatory to limit I_B and prevent damage. For I_C = 1 A and minimum h_FE = 60, required I_B ≥ 16.7 mA. With V_BE(sat) = 1.1 V and typical drive voltage of 5 V, R_B ≈ (5 − 1.1) V / 16.7 mA ≈ 230 Ω. A standard 220 Ω ±5% resistor ensures reliable saturation while accommodating h_FE variation and temperature drift.