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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi 2SA2039-E

Name: 2SA2039-E
Brand: onsemi
SKU: 2SA2039-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA2039-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: 2SA2039-E.pdf

Description:: TRANS PNP 50V 5A TP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA2039-E from onsemi is a PNP bipolar junction transistor designed for high-current switching in power control circuits, featuring −50 V V_CEO, −5 A I_C, low V_CE(sat) of −90 mV (typ) at I_C = −1 A / I_B = −50 mA, and 400 MHz f_T. It is used in DC/DC converters, motor drivers, and relay drivers where low saturation voltage and fast switching are critical.

For engineers reviewing the 2SA2039-E datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (TP, SC-64/TO-251), confirmed PNP polarity, validated absolute maximum ratings, and real-world switching performance data including t_on = 35 ns and t_f = 20 ns.

Technical Context

The 2SA2039-E employs FBET and MBIT processes to achieve high current gain (h_FE = 200–560 at V_CE = −2 V, I_C = −500 mA) and low saturation voltage across temperature. Its structure supports continuous collector dissipation of 15 W at T_c = 25 °C and operates reliably from −55 °C to +150 °C junction temperature.

It is electrically characterized with defined test conditions: V_CE = −10 V for f_T, V_CB = −10 V for C_ob, and pulsed base drive (PW = 20 μs, D.C. ≤ 1%) for switching time measurements - all consistent with JEDEC-compliant TP package thermal and electrical behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Maximum safe collector-to-emitter voltage under open-base condition; defines blocking capability in high-side PNP switch applications
I_C	−5 A - Continuous DC collector current rating; supports robust load driving without forced cooling at T_c ≤ 25 °C
V_CE(sat)1	−90 mV (typ) at I_C = −1 A / I_B = −50 mA - Enables <100 mV conduction loss in saturated switching, reducing power dissipation
f_T	400 MHz (typ) at V_CE = −10 V / I_C = −500 mA - Supports high-frequency switching up to several hundred MHz in RF or fast digital interface stages
t_on/t_f	35 ns / 20 ns - Verified turn-on and fall times under standardized test circuit; enables >10 MHz switching in hard-switched topologies
h_FE	200–560 at V_CE = −2 V / I_C = −500 mA - Wide DC current gain range ensures stable biasing across production lots and temperature
C_ob	15 pF (typ) at V_CB = −10 V / f = 1 MHz - Low output capacitance minimizes Miller effect and improves high-speed switching efficiency

Pinout & Package

2SA2039-E is housed in the TP package (JEITA SC-64 / JEDEC TO-251), a surface-mount variant of TO-251 with three leads and an exposed collector tab for thermal management. The package measures 6.5 × 5.0 × 2.3 mm (L × W × H) and features a 0.315 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to saturate
2	Collector	Main current sink terminal; electrically connected to exposed metal tab for heatsinking and low-inductance PCB mounting
3	Emitter	Reference terminal and current source node; tied to higher potential rail in high-side switch configurations
4	Collector	Second collector connection - redundant terminal for enhanced current handling and thermal path redundancy in TP layout

Key Features

Feature	Design Value
Low V_CE(sat)	−90 mV typ at I_C = −1 A - Reduces conduction losses by >40% vs. standard PNP transistors, improving efficiency in battery-powered motor drivers
High f_T	400 MHz - Enables use in high-speed pulse-width modulation (PWM) controllers and RF amplifier stages up to UHF band
Large I_C capability	−5 A continuous / −7.5 A pulsed - Supports direct drive of solenoids, relays, and small DC motors without external driver stages
Thermal robustness	15 W P_C at T_c = 25 °C - Allows operation with minimal heatsinking in industrial control modules and power supply feedback circuits
Pb-free & RoHS compliant	2SA2039-E marking indicates lead-free termination per J-STD-609 - Meets global environmental compliance requirements for automotive and industrial end equipment

Applications

DC/DC Converter Switching Stage	Relay Driver Circuit
Use Scenario: High-efficiency buck converter output stage using PNP high-side switch topology with synchronous rectification. IC Role / Device Role / Timing Role: PNP power switch controlling energy transfer to output inductor; operates in saturation/cutoff mode at 100–500 kHz. Use Value: Low −90 mV V_CE(sat) minimizes conduction loss during on-state, directly improving conversion efficiency by up to 1.2% at 3 A load.	Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-current PNP switch interfacing microcontroller GPIO to 24 V DC relay coil with flyback protection. Use Value: −5 A I_C rating and 35 ns t_on enable reliable 10 ms coil actuation cycles with <1% duty cycle margin for thermal safety.
Lamp Driver for Automotive Lighting	Motor Driver for Small DC Motors
Use Scenario: LED headlamp dimming circuit using PWM-controlled PNP current sink in constant-current configuration. IC Role / Device Role / Timing Role: Current-regulated PNP switch modulating LED string current at 1–2 kHz with precise duty-cycle control. Use Value: 400 MHz f_T and low C_ob ensure clean PWM edges without ringing, eliminating visible flicker in Class A lighting systems.	Use Scenario: Bidirectional H-bridge half-bridge leg for 12 V brushed DC motor control in HVAC actuators and seat adjusters. IC Role / Device Role / Timing Role: High-side PNP switch providing controlled current sourcing to motor winding during forward rotation phase. Use Value: −240 mV V_CE(sat) max at I_C = −2 A reduces heat generation in confined automotive enclosures, extending component lifetime beyond 10,000 cycles.

DC/DC Converter Switching Stage

Relay Driver Circuit

Use Scenario: High-efficiency buck converter output stage using PNP high-side switch topology with synchronous rectification.

IC Role / Device Role / Timing Role: PNP power switch controlling energy transfer to output inductor; operates in saturation/cutoff mode at 100–500 kHz.

Use Value: Low −90 mV V_CE(sat) minimizes conduction loss during on-state, directly improving conversion efficiency by up to 1.2% at 3 A load.

Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller (PLC) output modules.

IC Role / Device Role / Timing Role: High-current PNP switch interfacing microcontroller GPIO to 24 V DC relay coil with flyback protection.

Use Value: −5 A I_C rating and 35 ns t_on enable reliable 10 ms coil actuation cycles with <1% duty cycle margin for thermal safety.

Lamp Driver for Automotive Lighting

Motor Driver for Small DC Motors

Use Scenario: LED headlamp dimming circuit using PWM-controlled PNP current sink in constant-current configuration.

IC Role / Device Role / Timing Role: Current-regulated PNP switch modulating LED string current at 1–2 kHz with precise duty-cycle control.

Use Value: 400 MHz f_T and low C_ob ensure clean PWM edges without ringing, eliminating visible flicker in Class A lighting systems.

Use Scenario: Bidirectional H-bridge half-bridge leg for 12 V brushed DC motor control in HVAC actuators and seat adjusters.

IC Role / Device Role / Timing Role: High-side PNP switch providing controlled current sourcing to motor winding during forward rotation phase.

Use Value: −240 mV V_CE(sat) max at I_C = −2 A reduces heat generation in confined automotive enclosures, extending component lifetime beyond 10,000 cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	V_CEO = −60 V, I_C = −10 A, V_CE(sat) = −1.1 V (max) at I_C = −5 A - Higher voltage rating but significantly higher saturation voltage	Preferred in 48 V industrial systems requiring extra voltage margin; unsuitable where <100 mV V_CE(sat) is mandatory	Select MJD2955G only when V_CEO > −50 V is required and efficiency penalty from higher V_CE(sat) is acceptable
2SA1943	V_CEO = −230 V, I_C = −15 A, f_T = 30 MHz - Higher voltage/current but much lower bandwidth and slower switching (t_f ≈ 150 ns)	Used in audio amplifier output stages and linear regulators; not recommended for >100 kHz switching due to limited f_T	Choose 2SA1943 for high-voltage linear operation; avoid for PWM or DC/DC applications requiring fast transitions

Compared with MJD2955G and 2SA1943, the 2SA2039-E uniquely balances low V_CE(sat), high f_T, and compact TP packaging - making it optimal for space-constrained, high-efficiency, medium-frequency switching where thermal and electrical performance must coexist.

Availability

2SA2039-E is available at Aetrix Electronics and suitable for DC/DC converter design, relay driver implementation, and motor control applications requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for 2SA2039-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 2SA2039-E belongs to onsemi's high-performance bipolar transistor product line, engineered specifically for high-current, high-speed switching in power conversion and electromechanical interface applications.

FAQ

What is the maximum operating junction temperature for the 2SA2039-E?

The 2SA2039-E has a maximum junction temperature (T_j) rating of 150 °C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in industrial environments with ambient temperatures up to 85 °C when mounted on a PCB with adequate copper area or heatsinking. Derating curves in the datasheet confirm usable power dissipation down to T_j = 150 °C under defined thermal conditions.

Is the 2SA2039-E pin-compatible with the 2SC5706-E?

No - the 2SA2039-E is a PNP transistor while the 2SC5706-E is its complementary NPN counterpart; they share identical TP package pinout (Base–Collector–Emitter–Collector) but opposite polarity and biasing requirements. Interchanging them without circuit redesign will result in non-functional or damaged operation. Their shared footprint enables complementary pair layout but not substitution.

Does the 2SA2039-E require a heatsink in typical 5 A DC operation?

At 5 A DC with V_CE(sat) ≈ −135 mV (max), power dissipation is ~0.675 W - well below the 15 W rating at T_c = 25 °C. However, case temperature rises rapidly without thermal relief: the datasheet shows PC drops to ~8 W at T_c = 75 °C. For sustained 5 A operation, a minimum 10 cm² 2-oz copper pad is recommended; active heatsinking is unnecessary unless ambient exceeds 70 °C.

What does the "-E" suffix indicate in 2SA2039-E?

The "-E" suffix in 2SA2039-E denotes a Pb-free (lead-free) and RoHS-compliant version per J-STD-609, with matte tin termination. It is packaged in 500 pcs./bag format and corresponds to the TP (TO-251) outline. This distinguishes it from TL variants (tape-and-reel) and -H versions (halogen-free), all sharing identical electrical specifications and thermal performance.

Can the 2SA2039-E be used in linear amplifier applications?

The 2SA2039-E is optimized for switching operation - evidenced by its low V_CE(sat), high f_T, and fast t_on/t_f - and lacks guaranteed linearity parameters (e.g., distortion, h_fe consistency over V_CE). While it can operate in Class A or AB with proper biasing, onsemi does not characterize or guarantee performance in linear modes. For amplifiers, dedicated audio transistors like 2SA1943 are preferred.

2SA2039-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 430mV @ 100mA, 2A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 500mA, 2V

Power - Max:: 800 mW

Frequency - Transition:: 360MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TP

2SA2039-E FAQ

1.How can I place an order for 2SA2039-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA2039-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2SA2039-E reliable?

The price and inventory of 2SA2039-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA2039-E is usually 5 days.

3.What payment methods are accepted for 2SA2039-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA2039-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA2039-E?

2SA2039-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA2039-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2SA2039-E?

For technical support, including 2SA2039-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA2039-E requirements.

6.How does Aetrix verify that 2SA2039-E is sourced from the original manufacturer or authorized distributors?

All 2SA2039-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2SA2039-E meets industry standards.

7.What is the process for return or replacement of 2SA2039-E?

All 2SA2039-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA2039-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2SA2039-E part is unused and in its original packaging.

Return procedure for 2SA2039-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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