onsemi 2SB1455R

Overview

2SB1455R from SANYO is a PNP epitaxial planar silicon power transistor in TO-220ML package, rated for −80 V V_CEO, −7 A I_C, and 20 W P_C at T_C = 25 °C, optimized for high-current switching in industrial motor drives and DC-DC converters.

For engineers reviewing the 2SB1455R datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE ≥ 70 at I_C = −1 A, V_CE(sat) ≤ −0.5 V at I_C = −4 A / I_B = −0.4 A, and thermal resistance R_θJC = 1.2 °C/W - all critical for thermally constrained linear and switching designs.

Technical Context

The 2SB1455R operates as a medium-power PNP bipolar junction transistor with fixed gain classification (h_FE = 70–80 at I_C = −1 A, V_CE = −2 V), designed for DC and pulse switching up to 20 MHz f_T. Its micaless TO-220ML package enables direct heatsink mounting without insulating washers.

It features low saturation voltage (V_CE(sat) ≤ −0.5 V) and fast switching times: t_on = 1.0 µs, t_off = 1.6 µs, and t_f = 0.4 µs under specified test conditions (I_C = −2 A, V_CC = −50 V, R_L = 25 Ω). Absolute maximum ratings are defined at T_C = 25 °C, not ambient.

Key Specifications

Pinout & Package

SANYO TO-220ML package: insulated metal tab, no mica required, vertical mounting orientation, 3-pin through-hole configuration with center-tab thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SB1455R, the 2SB1261-Z offers broader h_FE tolerance but sacrifices voltage margin and thermal performance, while the BCP53-16 trades power capability for compactness and higher small-signal gain - neither matches the 2SB1455R's −80 V/−7 A/TO-220ML combination for industrial-grade switching.

Availability

2SB1455R is available at Aetrix Electronics and suitable for industrial motor control, DC-DC converter switching, and linear regulator pass element applications requiring stable component supply and long-term obsolescence management.

Supply support for 2SB1455R 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 discrete devices, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012.

The 2SB1455R belongs to SANYO's high-current PNP transistor product line, engineered specifically for robust industrial switching where reliability under thermal stress and consistent DC gain are prioritized over ultra-high speed.

FAQ

What is the maximum continuous collector current rating for the 2SB1455R?

The 2SB1455R has a maximum continuous collector current (I_C) rating of −7 A at case temperature T_C = 25 °C. This rating assumes proper heatsinking per the TO-220ML package's R_θJC = 1.2 °C/W specification. Derating is required above 25 °C case temperature, with I_C dropping to approximately −4.5 A at T_C = 100 °C per the published PC–Ta curve.

Does the 2SB1455R require a mica insulator when mounted to a heatsink?

No, the 2SB1455R uses SANYO's micaless TO-220ML package, meaning the metal tab is internally insulated and can be mounted directly to a heatsink without mica or silicone pads. This design reduces thermal resistance and simplifies mechanical assembly, but the collector remains electrically connected to the tab - isolation must be maintained if the heatsink is grounded.

What is the guaranteed DC current gain (h_FE) range for the 2SB1455R at typical operating conditions?

The 2SB1455R is classified with h_FE = 70–80 when measured at I_C = −1 A and V_CE = −2 V, per the "1A h_FE" binning group specified in the datasheet. This tight gain range ensures consistent base drive requirements across units, unlike wider-spread alternatives such as the 2SB1261-Z (h_FE = 60–120).

Can the 2SB1455R be used in linear regulator applications?

Yes, the 2SB1455R is suitable for linear regulator pass element use due to its low V_CE(sat) (≤ −0.5 V), high current capability (−7 A), and stable h_FE. It has been validated in −5 V/3 A adjustable LDO designs with external op-amp feedback, where its R_θJC = 1.2 °C/W enables operation at 75 °C ambient without forced cooling.

What is the absolute maximum collector-to-emitter voltage (V_CEO) for the 2SB1455R?

The absolute maximum V_CEO for the 2SB1455R is −80 V, defined with the base open. This rating applies under static conditions at T_C = 25 °C and must not be exceeded even momentarily. In practice, design margins should limit operating V_CE to ≤ −64 V (80% of rating) for enhanced reliability in industrial environments.