onsemi 2SA2031

Overview

2SA2031 from SANYO is a PNP epitaxial planar silicon power transistor rated for V_CEO = −230 V, I_C = −15 A, and P_C = 140 W at T_c = 25°C, designed for high-voltage, high-current switching in audio output stages and industrial power amplifiers.

For engineers reviewing the 2SA2031 datasheet, pinout, applications, or equivalent options, key selection criteria include its wide Active Safe Operating Area (ASO), low V_CE(sat) of −0.2 V at I_C = −7.5 A / I_B = −0.75 A, and robust −250 V V_CBO rating suitable for demanding linear and switching power applications.

Technical Context

The 2SA2031 employs MBIT (Modified Base Injection Technology) process to enhance ruggedness and switching performance. Its large ASO enables stable operation under high-voltage, high-current transient conditions without secondary breakdown, supporting reliable use in Class-AB audio output stages and DC motor drive circuits.

It delivers h_FE ≥ 35 at I_C = −7.5 A and f_T ≥ 15 MHz at I_C = −1 A, confirming suitability for medium-frequency power amplification. The device exhibits fast switching with t_on ≤ 0.56 µs, t_stg ≤ 3.3 µs, and t_f ≤ 0.4 µs under specified test conditions.

Key Specifications

Pinout & Package

2SA2031 is housed in a TO-3PB metal package with electrically isolated collector tab, optimized for direct mounting to heatsinks with minimal thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SA1943 and MJE15034, the 2SA2031 offers superior combination of high current (−15 A), high power (140 W), and high gain (h_FE ≥ 35 at 7.5 A), making it uniquely suited for high-fidelity audio output and industrial switching where both voltage headroom and thermal margin are critical.

Availability

2SA2031 is available at Aetrix Electronics and suitable for audio power amplifiers, industrial DC motor drivers, SMPS protection circuits, and high-voltage linear regulators requiring stable component supply and long-term obsolescence management.

Supply support for 2SA2031 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 analog and power devices, later integrated into ON Semiconductor in 2011.

The 2SA2031 belongs to SANYO's high-reliability power transistor product line, engineered specifically for high-voltage, high-current linear and switching applications in professional audio and industrial control systems.

FAQ

What is the maximum junction temperature rating for the 2SA2031?

The 2SA2031 has a maximum junction temperature (T_j) rating of 150°C, as specified in its Absolute Maximum Ratings table. This allows operation in high-ambient environments when properly heatsinked. Thermal derating curves show usable collector dissipation down to 0 W at 150°C case temperature. Designers must ensure that actual T_j remains below this limit under worst-case electrical and thermal conditions to maintain reliability and avoid permanent degradation of the 2SA2031.

Does the 2SA2031 have a built-in base-emitter shunt resistor?

No, the 2SA2031 does not include an integrated base-emitter shunt resistor. It is a standard three-terminal PNP bipolar junction transistor requiring external base biasing components. The datasheet provides no indication of internal resistive elements, and all electrical characteristics assume discrete external drive circuitry. Users must add appropriate base pull-down resistors if needed for turn-off assurance in switching applications using the 2SA2031.

What is the safe operating area (SOA) limitation for DC operation of the 2SA2031?

For DC operation, the 2SA2031's SOA is limited to 2.5 W at T_c = 25°C - significantly lower than its pulsed rating of 140 W - due to thermal saturation constraints. The derating curve shows linear reduction to 0 W at T_c = 160°C. This reflects the device's thermal resistance and packaging; sustained DC use above 2.5 W requires active cooling or reduced voltage/current to stay within the 2SA2031's continuous thermal envelope.

Can the 2SA2031 be used as a direct replacement for the 2SA1943 in audio amplifier designs?

The 2SA2031 can replace the 2SA1943 in many audio amplifier output stages due to matching V_CEO (−230 V) and I_C (−15 A) ratings, but differences exist: 2SA2031 specifies minimum h_FE = 35 at 7.5 A versus 20 for 2SA1943, and its f_T is ≥15 MHz vs. ~12 MHz. These improvements may enhance linearity and slew rate, but bias network recalibration may be needed. Verify thermal layout compatibility, as both use TO-3PB, but confirm mechanical fit and insulation requirements before substituting the 2SA2031.

What is the typical Cob (output capacitance) value for the 2SA2031 and how does it affect high-frequency performance?

The 2SA2031 has a typical output capacitance (C_ob) of 200 pF at V_CB = −10 V and f = 1 MHz, with a maximum of 400 pF. This capacitance forms part of the transistor's high-frequency impedance profile and directly impacts Miller effect gain roll-off and switching speed. In audio output stages, C_ob contributes to stability compensation requirements; in RF switching, it limits usable bandwidth. Designers should include this 200 pF value in small-signal models when simulating amplifier stability or calculating snubber values for the 2SA2031.