onsemi 2SA2044-E

Overview

2SA2044-E from ON Semiconductor is a PNP bipolar junction transistor designed for high-current switching in power control circuits, featuring −50 V V_CEO, −8 A I_C, low V_CE(sat) of −160 mV (typ) at I_C = −3.5 A / I_B = −175 mA, and f_T = 330 MHz - used in DC/DC converters, motor drivers, and lamp drivers.

For engineers reviewing the 2SA2044-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TP-FA package thermal performance, V_CE(sat) under pulsed load conditions, and compatibility with TO-252 footprint layouts.

Technical Context

This device employs FBET and MBIT processes to achieve high-speed switching (t_on = 30 ns typ, t_f = 25 ns) and low saturation voltage. Its dual-collector TP-FA configuration supports high-power dissipation (15 W at T_c = 25°C) while maintaining stable h_FE (200–560) across −25°C to +75°C ambient.

The 2SA2044-E operates as a single PNP switch with emitter-grounded topology, requiring negative base drive. It is not a logic-level device - V_BE(sat) reaches −1.2 V max at I_C = −2 A / I_B = −40 mA, and its Cob = 28 pF (typ) at V_CB = −10 V enables fast turn-off in hard-switching topologies.

Key Specifications

Pinout & Package

2SA2044-E uses the TP-FA package (JEDEC TO-252, JEITA SC-63), a surface-mount, 4-terminal power plastic package with exposed drain pad for thermal conduction. Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector - dual-collector configuration improves current sharing and thermal spreading.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SA2044-E, 2SA2039-E trades voltage/current headroom for cost and thermal simplicity, while MJD2955RLG offers greater ruggedness at the expense of conduction efficiency - making 2SA2044-E optimal for thermally constrained, high-frequency industrial switching where low V_CE(sat) and speed are critical.

Availability

2SA2044-E is available at Aetrix Electronics and suitable for DC/DC converters, motor drivers, lamp drivers, and relay drivers requiring stable component supply, full traceability, and long-term industrial lifecycle support.

Supply support for 2SA2044-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

ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The 2SA2044-E belongs to the 2SA20xx PNP transistor family engineered for high-current, high-speed switching in industrial power conversion and electromechanical control - emphasizing low saturation voltage, thermal robustness, and TO-252-compatible manufacturability.

FAQ

What is the absolute maximum V_CEO rating for the 2SA2044-E?

The 2SA2044-E has an absolute maximum collector-to-emitter voltage rating of −50 V under open-base conditions (I_C = −1 mA, R_BE = ∞). This rating defines the upper limit of reverse bias the device can withstand without avalanche breakdown. Exceeding this voltage risks permanent damage, even momentarily. Designers must ensure system transients remain within this limit, especially in inductive load switching.

Does the 2SA2044-E have a dual-collector configuration, and how does it affect PCB layout?

Yes, the 2SA2044-E in TP-FA package features Pins 2 and 4 both connected to the collector. This dual-collector design reduces effective bondwire inductance and spreads thermal load across two pads. PCB layout must connect both pins to the same high-current copper pour - splitting them or routing separately degrades switching performance and thermal reliability. The land pattern must mirror the official ON Semiconductor outline drawing for TP-FA.

What is the typical V_CE(sat) of the 2SA2044-E under real-world switching conditions?

The 2SA2044-E delivers −160 mV typical V_CE(sat) at I_C = −3.5 A and I_B = −175 mA (IC/IB = 20), and −110 mV typical at I_C = −2 A / I_B = −40 mA. These values are measured at T_a = 25°C and represent actual conduction loss under defined drive conditions - not guaranteed minimums. At elevated temperatures, V_CE(sat) increases by ~0.5 mV/°C, so thermal design must account for worst-case loss at full load.

Can the 2SA2044-E replace the 2SA2040-E in existing designs?

Yes, the 2SA2044-E is a direct functional and pinout-compatible replacement for the 2SA2040-E, sharing identical TP-FA package dimensions, pin assignment (1=Base, 2&4=Collector, 3=Emitter), electrical specifications, and thermal characteristics. Both devices meet the same ON Semiconductor specification No. 6913 and are manufactured using identical FBET/MBIT processes - no PCB or firmware changes are required for drop-in substitution.

What is the maximum allowable base current for continuous operation of the 2SA2044-E?

The 2SA2044-E specifies a maximum continuous base current (I_B) of −2 A at T_a = 25°C. This rating ensures safe operation of the base-emitter junction under sustained drive. In practice, base drive circuits must limit peak I_B to ≤−2 A and maintain average I_B well below this value to avoid thermal runaway - typical designs use I_B = −175 mA for 3.5 A collector current, yielding robust saturation with margin.