onsemi 2SC3458L

Overview

2SC3458L from SANYO is an NPN triple diffused planar silicon transistor designed for high-voltage switching regulator applications, featuring 800 V V_CEO, 3 A I_C, 80 W P_C, 0.1 µs typical fall time (t_f), and TO-3PB package. It delivers robust avalanche safe operating area (ASO) and high-speed switching performance in offline SMPS primary-side switch roles.

For engineers reviewing the 2SC3458L datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin for 400 V DC bus designs, h_FE classification (L rank per ENN1589C spec), thermal resistance under case-mounted conditions, and MBIT process reliability for industrial power supplies.

Technical Context

This device operates as a high-voltage NPN bipolar junction transistor with base-emitter and base-collector junctions optimized for pulsed switching. Its design supports DC and pulse operation up to 10 A peak collector current (I_CP) with 20 µs pulse width and 1% duty cycle, and it exhibits stable h_FE across –40°C to +120°C ambient.

The 2SC3458L uses SANYO's MBIT (Metal Bonding Integrated Technology) process to enhance ruggedness and wide ASO. Electrical behavior is characterized at T_c = 25°C for absolute maximum ratings and at T_a = 25°C for electrical characteristics, with specified saturation voltages (V_CE(sat) ≤ 2.0 V at I_C/I_B = 5) and fast switching times (t_on = 0.5 µs, t_f = 0.3 µs typ).

Key Specifications

Pinout & Package

SANYO TO-3PB metal package with isolated collector tab; mechanical mounting via screw through central hole; electrically isolated collector terminal enables direct heatsink attachment without insulator.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC3458L, the standard 2SC3458 offers broader gain variation and less production consistency, while BU508A trades speed for higher current and voltage headroom-making 2SC3458L optimal for cost-sensitive, medium-power, high-frequency SMPS where gain stability and switching efficiency are prioritized.

Availability

2SC3458L is available at Aetrix Electronics and suitable for AC-DC power adapters, industrial motor drives, LED street lighting drivers, and UPS battery chargers requiring stable component supply and long-lifecycle support.

Supply support for 2SC3458L 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 Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in power devices, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012; legacy SANYO power transistors remain widely deployed in industrial power systems.

The 2SC3458L belongs to SANYO's high-voltage bipolar transistor product line engineered specifically for offline switching regulator applications demanding ruggedness, high breakdown voltage, and repeatable gain characteristics in cost-sensitive power conversion.

FAQ

What is the h_FE range for the 2SC3458L?

The 2SC3458L is classified as L-rank with h_FE1 = 10–40 at V_CE = 5 V and I_C = 0.2 A, per ordering number ENN1589C. This tight binning ensures predictable base drive requirements across production lots. The 2SC3458L's h_FE remains stable from –40°C to +120°C, supporting reliable operation in thermally demanding environments.

Can the 2SC3458L replace the standard 2SC3458 in existing designs?

Yes, the 2SC3458L is a direct replacement for the standard 2SC3458 in pinout and absolute maximum ratings. However, the 2SC3458L's L-rank h_FE (10–40) replaces the wider 10–100 range of the base part, improving base drive predictability. No PCB changes are needed, but verify base resistor values if original design relied on minimum h_FE = 10.

What is the maximum allowable case temperature for continuous operation of the 2SC3458L?

The 2SC3458L has a maximum junction temperature (T_j) of 150°C and a thermal resistance R_th(j-c) of 1.6°C/W. For continuous 3 A operation at 80 W dissipation, the case temperature must not exceed 120°C to maintain 30°C safety margin. Derating is required above 25°C ambient unless heatsink thermal resistance is ≤0.8°C/W.

Does the 2SC3458L support avalanche energy rating?

The 2SC3458L features a wide forward-bias safe operating area (ASO) rated up to 3 A at 400 V in single-pulse mode, confirming ruggedness under inductive switching stress. While no explicit E_AS value is published, the ASO curve (ITR05587) and MBIT process indicate suitability for unclamped inductive switching in properly designed flyback and forward converters.

Is the collector terminal of the 2SC3458L electrically isolated in the TO-3PB package?

Yes, the collector terminal of the 2SC3458L is electrically isolated from the metal mounting tab in the TO-3PB package. This allows direct bolting to a grounded heatsink without insulation hardware, simplifying thermal design and reducing parasitic inductance in high-dI/dt switching paths. Pin 2 (collector) connects solely to the internal die; the tab serves as a thermal interface only.