onsemi 2SA1020G

Overview

2SA1020G from ON Semiconductor is a Pb-free TO-92 packaged PNP bipolar junction transistor rated for 50 V V_CEO, 2.0 A continuous collector current, and 1.5 W power dissipation at T_C = 25°C, designed for high-current linear and switching applications in industrial power supplies and relay drivers.

For engineers reviewing the 2SA1020G datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) ≤ 0.5 V at I_C = 1.0 A / I_B = 50 mA, h_FE ≥ 70 at I_C = 500 mA, f_T = 100 MHz, and thermal resistance R_JC = 83.3°C/W - all confirmed in the official ON Semiconductor datasheet Rev. 3 (2006).

Technical Context

This PNP transistor operates with negative voltage/current polarities per standard BJT convention, requiring reverse-biased base-emitter junction for conduction. Its safe operating area (SOA) is defined by thermal limit, second breakdown limit, and wire bond current limit - validated up to −2.0 A and −2.0 V in pulsed conditions.

The device exhibits DC current gain h_FE ranging from 70–240 at I_C = 500 mA and 40–240 at I_C = 1.5 A, with saturation voltages tightly specified: V_CE(sat) ≤ 0.5 V and V_BE(sat) ≤ 1.2 V under I_C/I_B = 10 drive, supporting robust switching performance in low-side switch configurations.

Key Specifications

Pinout & Package

2SA1020G uses the industry-standard TO-92 (Case 29-10, Style 14) plastic package with lead-free finish. Pin 1 is Emitter, Pin 2 is Collector, Pin 3 is Base - as marked on the device body and confirmed in Figure 4 of the ON Semiconductor datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor applications.

Compared with 2SA1020G, 2SA1015G offers cost savings in lower-current roles but sacrifices 0.5 A headroom and thermal capacity, while MPSA92 trades current capability for extreme voltage tolerance - making 2SA1020G the optimal choice for balanced high-current, medium-voltage PNP switching.

Availability

2SA1020G is available at Aetrix Electronics and suitable for industrial relay drivers, DC power supply regulation, automotive lighting control, and audio amplifier biasing requiring stable component supply and RoHS-compliant packaging.

Supply support for 2SA1020G 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2SA1020G belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for rugged, high-current linear and switching applications where reliability, thermal performance, and Pb-free compliance are critical.

FAQ

What is the maximum continuous collector current rating for the 2SA1020G?

The 2SA1020G is rated for 2.0 A continuous collector current at ambient temperature (T_A = 25°C), with linear derating of 5.0 mW/°C above that temperature. This rating assumes adequate PCB copper area or heatsinking to maintain junction temperature within −55°C to +150°C limits. The 2SA1020G datasheet specifies this value in the Maximum Ratings table on page 1.

Is the 2SA1020G RoHS-compliant and what does the 'G' suffix indicate?

Yes, the 2SA1020G is RoHS-compliant. The 'G' suffix explicitly denotes the Pb-free version of the device, as confirmed in the Ordering Information section of the ON Semiconductor datasheet (Rev. 3). This applies to both the 2SA1020G and 2SA1020RLRAG variants, and the marking "2SA1020 AYWW" includes the Pb-free indicator per ON Semiconductor's packaging standard.

What is the typical DC current gain (h_FE) of the 2SA1020G and under what conditions is it measured?

The 2SA1020G exhibits h_FE of 70–240 when measured at I_C = 500 mA and V_CE = 2.0 V, and 40–240 at I_C = 1.5 A and V_CE = 2.0 V, per the Electrical Characteristics table on page 2 of the datasheet. These ranges reflect production lot variation and ensure design margin for reliable saturation in switching applications using the 2SA1020G.

Can the 2SA1020G be used in a common-emitter switching configuration with 12 V supply?

Yes, the 2SA1020G is well-suited for common-emitter PNP switching with a 12 V supply. With V_CEO = 50 V and V_CE(sat) ≤ 0.5 V at I_C = 1.0 A, it provides ample voltage margin and low conduction loss. Proper base drive (e.g., I_B ≥ 50 mA for 1.0 A load) and thermal management are required - both validated in the 2SA1020G SOA curves and thermal resistance specs.

What is the thermal resistance from junction to case (R_JC) for the 2SA1020G and how does it impact heatsinking?

The 2SA1020G has a specified R_JC of 83.3°C/W, meaning each watt of dissipated power raises the junction temperature 83.3°C above the case temperature. This value enables effective passive heatsinking - for example, mounting the TO-92 package directly to a 25 mm² copper pour can sustain ~1.0 W continuously. The 2SA1020G's R_JC is documented in the Thermal Characteristics table on page 1 of the datasheet.