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

onsemi 2SA2039-H

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

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Part No.:: 2SA2039-H

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SA2039-H.pdf

Description:: TRANS PNP 50V 5A TP

Quantity:: RFQ Add To RFQ list

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Inventory:2,687

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Product details

Overview

2SA2039-H 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 −135 mV (max) at −2 A/−100 mA, and 400 MHz f_T. It is used in DC/DC converters, motor drivers, and lamp drivers where robust saturation performance and thermal reliability are required.

For engineers reviewing the 2SA2039-H datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TP-FA / TO-252), confirmed PNP polarity, absolute maximum ratings, switching timing (t_on = 35 ns, t_f = 20 ns), and direct alternatives with documented electrical and packaging differences.

Technical Context

The 2SA2039-H employs FBET and MBIT processes to achieve low saturation voltage and high-speed switching. Its structure supports continuous collector current up to −5 A and pulse current up to −7.5 A, with thermal design enabled by 15 W power dissipation at T_C = 25°C.

It operates as a single PNP device in TP-FA (TO-252) surface-mount package, with JEDEC SC-63 compliance. Electrical behavior is characterized at V_CE = −2 V and −10 V, supporting both linear amplification and saturated switching modes across −25°C to +75°C ambient ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Maximum safe collector-emitter voltage under open-base condition; defines breakdown margin in high-side switch applications.
I_C	−5 A - Continuous DC collector current rating; supports motor and relay loads without forced cooling at T_C ≤ 25°C.
V_CE(sat) @ −2 A	−135 mV (max) - Low saturation voltage reduces conduction loss and self-heating in high-duty-cycle switching.
f_T	400 MHz - Gain-bandwidth product enabling stable operation up to several tens of MHz in driver stages.
t_on/t_f	35 ns / 20 ns - Fast switching times minimize transition losses in PWM-controlled power stages.
P_C @ T_C=25°C	15 W - Case-referenced power dissipation capacity; requires appropriate PCB copper area or heatsinking for sustained operation.
h_FE @ −500 mA	200–560 - High DC current gain enables low base drive current requirements in discrete amplifier or switch configurations.

Pinout & Package

2SA2039-H is packaged in TP-FA (JEDEC TO-252, JEITA SC-63), a surface-mount, 4-pin single-PNP transistor with exposed collector pads for thermal management. Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector (dual-collector configuration).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative bias relative to emitter to turn on.
2 & 4	Collector	Dual-collector terminals electrically tied internally; provide parallel current paths and enhanced thermal conduction to PCB.
3	Emitter	Common reference terminal; connected to higher potential (e.g., V_CC) in high-side switch topologies.

Key Features

Feature	Design Value
Low V_CE(sat)	−135 mV max at −2 A ensures <1.4 W conduction loss per device, reducing thermal stress in compact layouts.
High-speed switching	35 ns turn-on and 20 ns fall time support >5 MHz PWM frequencies in DC/DC controllers and gate drivers.
High-power capability	15 W case dissipation enables use without external heatsinks in moderate-duty industrial motor drives.
Pb-free & halogen-free	Complies with RoHS and JESD204B environmental standards; suitable for automotive and industrial end-equipment.
TP-FA package	TO-252 footprint with dual collector leads improves solder joint reliability and thermal transfer vs. standard SOT-223.

Applications

DC/DC Converter Switching Stage	Lamp Driver for Automotive Lighting
Use Scenario: High-efficiency buck converter output stage driving 12 V loads up to 3 A. IC Role / Device Role / Timing Role: PNP high-side switch controlling inductor current path during PWM off-cycle. Use Value: −135 mV V_CE(sat) minimizes dropout and improves efficiency over discrete alternatives with >200 mV saturation.	Use Scenario: LED headlamp current regulation in 24 V commercial vehicle systems. IC Role / Device Role / Timing Role: Constant-current sink switch modulated at 1–5 kHz to dim high-brightness LEDs. Use Value: 400 MHz f_T and fast t_f ensure clean square-wave edges, eliminating visible flicker and EMI spikes.
Motor Driver for Small BLDC Fans	Relay Driver in Industrial PLC Outputs
Use Scenario: Commutation switch in 24 V, 1.5 A brushless DC fan module. IC Role / Device Role / Timing Role: Low-side PNP switch (emitter-grounded) driving phase winding via bootstrap gate driver. Use Value: −5 A I_C rating and 15 W P_C allow short-duration stall current handling without derating.	Use Scenario: Solid-state replacement for electromechanical relays in 24 V digital output modules. IC Role / Device Role / Timing Role: High-voltage interface transistor isolating microcontroller GPIO from inductive load back-EMF. Use Value: −50 V V_CEO withstands >40 V transients common in industrial 24 V rail environments.

DC/DC Converter Switching Stage

Lamp Driver for Automotive Lighting

Use Scenario: High-efficiency buck converter output stage driving 12 V loads up to 3 A.

IC Role / Device Role / Timing Role: PNP high-side switch controlling inductor current path during PWM off-cycle.

Use Value: −135 mV V_CE(sat) minimizes dropout and improves efficiency over discrete alternatives with >200 mV saturation.

Use Scenario: LED headlamp current regulation in 24 V commercial vehicle systems.

IC Role / Device Role / Timing Role: Constant-current sink switch modulated at 1–5 kHz to dim high-brightness LEDs.

Use Value: 400 MHz f_T and fast t_f ensure clean square-wave edges, eliminating visible flicker and EMI spikes.

Motor Driver for Small BLDC Fans

Relay Driver in Industrial PLC Outputs

Use Scenario: Commutation switch in 24 V, 1.5 A brushless DC fan module.

IC Role / Device Role / Timing Role: Low-side PNP switch (emitter-grounded) driving phase winding via bootstrap gate driver.

Use Value: −5 A I_C rating and 15 W P_C allow short-duration stall current handling without derating.

Use Scenario: Solid-state replacement for electromechanical relays in 24 V digital output modules.

IC Role / Device Role / Timing Role: High-voltage interface transistor isolating microcontroller GPIO from inductive load back-EMF.

Use Value: −50 V V_CEO withstands >40 V transients common in industrial 24 V rail environments.

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
2SA2039-E	Same die, TP (TO-251) package; single-collector lead; 0.8 W P_C at T_A = 25°C vs. 15 W at T_C for -H.	Lower thermal performance; suited for low-power, non-heatsinked PCBs where space constraints favor TO-251.	Select 2SA2039-E only when board layout prohibits TO-252 mounting or when <1 W dissipation suffices.
MJD2955T4G	PNP, −60 V V_CEO, −10 A I_C, but V_CE(sat) = −1.8 V (max) at −8 A - 13× higher conduction loss than 2SA2039-H.	Higher voltage margin but unsuitable for efficiency-critical switching; better for linear regulation or low-frequency switching.	Choose MJD2955T4G only if −60 V rating is mandatory and thermal budget allows >10 W loss; not drop-in for 2SA2039-H.

Compared with 2SA2039-E and MJD2955T4G, the 2SA2039-H uniquely balances −50 V rating, −5 A current, ultra-low −135 mV saturation, and TO-252 thermal performance-making it optimal for space-constrained, high-efficiency 24 V industrial switching where both voltage headroom and conduction loss matter.

Availability

2SA2039-H is available at Aetrix Electronics and suitable for DC/DC converter designs, automotive lamp drivers, and industrial motor control applications requiring stable component supply, halogen-free compliance, and TO-252 thermal performance.

Supply support for 2SA2039-H 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The 2SA2039-H belongs to onsemi's general-purpose bipolar transistor family engineered for high-current, high-speed switching in industrial power conversion and control systems.

FAQ

What is the package type and lead count of the 2SA2039-H?

The 2SA2039-H uses the TP-FA package (JEDEC TO-252, JEITA SC-63), a 4-lead surface-mount device with Pins 1 = Base, 2 = Collector, 3 = Emitter, and 4 = Collector (dual-collector configuration). This layout enhances thermal conduction and current handling versus 3-lead variants like TP (TO-251).

Does the 2SA2039-H support pulsed operation beyond its continuous current rating?

Yes, the 2SA2039-H supports −7.5 A peak collector current (I_CP) in pulse mode with 100 ms duty cycle limits. This enables brief overload tolerance in motor startup or relay pull-in scenarios, provided average power remains within the 15 W T_C = 25°C limit.

How does the 2SA2039-H compare to the 2SA2039-E in thermal performance?

The 2SA2039-H (TP-FA/TO-252) delivers 15 W power dissipation at T_C = 25°C, while the 2SA2039-E (TP/TO-251) is rated for only 0.8 W at T_A = 25°C. The -H variant's dual-collector TO-252 package provides superior PCB heat spreading and lower junction-to-case resistance.

Is the 2SA2039-H suitable for high-frequency switching above 1 MHz?

Yes-the 2SA2039-H has a 400 MHz gain-bandwidth product (f_T) and 20 ns fall time, making it viable for PWM switching up to ~5 MHz in well-designed layouts. Its low C_ob (15 pF typical) further supports clean edge integrity in fast-switching applications.

What is the guaranteed minimum h_FE for the 2SA2039-H at −500 mA collector current?

The 2SA2039-H guarantees h_FE ≥ 200 at V_CE = −2 V and I_C = −500 mA, per onsemi's datasheet specification. This high DC gain reduces required base drive current, easing interface design with microcontrollers or logic-level drivers.

2SA2039-H 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:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TP

2SA2039-H FAQ

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

Please submit a Request for Quotation (RFQ) for 2SA2039-H 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-H reliable?

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your 2SA2039-H 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-H?

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

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

All 2SA2039-H 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-H meets industry standards.

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

All 2SA2039-H units undergo pre-shipment inspection (PSI). If there is an issue with 2SA2039-H, 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-H part is unused and in its original packaging.

Return procedure for 2SA2039-H:

1.Submit a request within 90 days.

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

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