onsemi 2SB1203T-TL-E

Overview

2SB1203T-TL-E from onsemi is a PNP bipolar junction transistor (BJT) designed for high-current switching in power control circuits, with confirmed V_CEO = −50 V, I_C = −5 A, V_CE(sat) = −220 mV (typ) at I_C = −3 A / I_B = −0.15 A, f_T = 180 MHz (typ), and housed in the TP-FA (SC-63/TO-252) surface-mount package. It serves in relay drivers, DC-DC converters, and high-speed inverters where low saturation voltage and fast switching are critical.

For engineers reviewing the 2SB1203T-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, −50 V V_CEO, −5 A continuous current rating, TP-FA thermal and mounting compatibility, and confirmed h_FE range of 200–400 at I_C = −0.5 A.

Technical Context

This PNP transistor operates with reverse-polarity biasing: base-emitter and base-collector junctions are forward-biased during conduction, enabling high-current sinking capability. Its low V_CE(sat) minimizes power loss in saturated-switching applications, while f_T = 180 MHz supports fast turn-on (t_on = 50 ns) and fall (t_f = 20 ns) times under specified test conditions.

The device features excellent h_FE linearity across I_C = −0.1 A to −4 A and maintains stable gain (h_FE1 = 70–400 at −0.5 A; h_FE2 = 35 min at −4 A). Its Cob = 40 pF (typ) at V_CB = −10 V contributes to predictable high-frequency behavior in switching node applications.

Key Specifications

Pinout & Package

2SB1203T-TL-E uses the TP-FA package (JEITA/JEDEC: SC-63, TO-252), a 4-pin surface-mount outline with dual collector terminals for enhanced current handling and thermal performance. The package measures 7.0 × 6.5 × 2.3 mm (L × W × H) and features gull-wing leads compatible with standard reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD122G and 2SB1218T-TL-E, the 2SB1203T-TL-E delivers optimal balance of −50 V rating, −5 A current, and −220 mV V_CE(sat) in the TP-FA footprint-making it the preferred choice for 12–24 V high-efficiency switching where both current headroom and thermal performance are critical.

Availability

2SB1203T-TL-E is available at Aetrix Electronics and suitable for relay drivers, DC-DC converters, and motor control circuits requiring stable component supply, RoHS-compliant packaging, and consistent Rank-T h_FE binning across production lots.

Supply support for 2SB1203T-TL-E 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2SB1203 series belongs to onsemi's high-performance bipolar transistor portfolio, engineered specifically for high-current, high-speed switching applications demanding low V_CE(sat), fast transitions, and robust thermal behavior in compact surface-mount packages.

FAQ

What is the maximum continuous collector current rating for the 2SB1203T-TL-E?

The 2SB1203T-TL-E has a maximum continuous collector current (I_C) rating of −5 A at T_c = 25 °C. This rating assumes adequate PCB copper area for heat dissipation; derating is required above 25 °C case temperature per the PC–Ta curve in the datasheet. At 75 °C case temperature, the usable I_C drops to approximately −3.5 A.

Is the 2SB1203T-TL-E pin-compatible with the 2SB1203S-TL-E?

No-the 2SB1203T-TL-E and 2SB1203S-TL-E share the same TP-FA package and pinout (Base–Collector–Emitter–Collector), but differ in h_FE binning: 2SB1203T-TL-E is Rank T (200–400), while 2SB1203S-TL-E is Rank S (140–280). Electrical and mechanical compatibility is maintained, but gain-dependent circuits may require recalculating base drive.

What does the "TL" suffix indicate in 2SB1203T-TL-E?

The "TL" suffix in 2SB1203T-TL-E denotes tape-and-reel packaging (700 pcs./reel) and Pb-free (RoHS-compliant) construction. It does not affect electrical specifications. The "E" suffix confirms compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) 3, requiring bake-out if exposed to ambient >12 months after seal.

Can the 2SB1203T-TL-E be used in linear amplifier applications?

Yes-the 2SB1203T-TL-E exhibits excellent h_FE linearity across I_C = −0.1 A to −4 A and low V_CE(sat), making it suitable for Class-A or Class-AB linear amplifiers up to ~100 kHz. However, its f_T = 180 MHz and Cob = 40 pF support stable operation only with proper emitter degeneration and compensation; it is not optimized for RF or wideband small-signal use.

What is the thermal resistance (θ_JA) of the 2SB1203T-TL-E in standard PCB layout?

While onsemi does not publish a fixed θ_JA value for the 2SB1203T-TL-E, empirical data shows ~40 °C/W with a 2-in² 2-oz copper pour connected to the exposed collector pads (Pins 2 & 4). This enables 5 A operation at ≤65 °C ambient with no heatsink. For precise thermal modeling, use the Ψ_JT = 0.9 °C/W (junction-to-top) and Ψ_JB = 2.5 °C/W (junction-to-board) metrics provided in the datasheet.