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

onsemi 2N4920G

Name: 2N4920G
Brand: onsemi
SKU: 2N4920G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4920G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2N4920G.pdf

Description:: TRANS PNP 80V 1A TO-126

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N4920G from onsemi is a medium-power plastic PNP silicon transistor rated for 80 V_CEO, 1.0 A continuous collector current (JEDEC), 3.0 A peak capability, 30 W power dissipation at T_C = 25°C, and V_CE(sat) ≤ 0.6 V at I_C = 1.0 A / I_B = 0.1 A - used in high-current switching and linear amplifier stages of industrial power supplies and motor drivers.

For engineers reviewing the 2N4920G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, TO-225 package layout, safe operating area limits, thermal resistance data, and validated alternative transistors for driver-stage redesigns requiring ≥80 V PNP switching capability.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with DC current gain (h_FE) specified down to 10 at I_C = 1.0 A and V_CE = 1.0 V, supporting robust current-controlled switching. Its safe operating area (SOA) is defined up to 150°C junction temperature with second-breakdown-limited pulse curves for 100 µs to 5 ms durations.

Thermal design relies on a maximum junction-to-case thermal resistance of 4.16°C/W, requiring mechanical mounting with thermal compound per onsemi recommendations. Switching performance includes t_r < 15 ns, t_f ≤ 0.7 µs (I_C = 100 mA, I_C/I_B = 10), and t_s′ ≤ 0.5 µs under specified test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 Vdc - maximum collector-emitter voltage before breakdown under open-base condition; defines upper rail limit in high-side switch designs.
I_C (continuous)	1.0 Adc - JEDEC-rated DC current; usable for sustained 1 A loads with proper heatsinking and derating above 25°C case temperature.
P_D @ T_C = 25°C	30 W - total power dissipation capability when case is held at 25°C; requires thermal interface and heatsink for >5 W operation.
V_CE(sat)	≤ 0.6 Vdc @ I_C = 1.0 A, I_B = 0.1 A - low saturation voltage minimizes conduction loss in switching applications.
h_FE	10 (min) @ I_C = 1.0 A, V_CE = 1.0 V - minimum DC current gain at full rated current; supports base drive design with ≥10× overdrive margin.
R_θJC	4.16°C/W (max) - junction-to-case thermal resistance; determines temperature rise per watt dissipated across the die-to-package interface.
f_T	3.0 MHz - current-gain bandwidth product at I_C = 250 mA, V_CE = 10 V; suitable for audio-frequency amplification and moderate-speed switching.

Pinout & Package

2N4920G uses the TO-225 (Case 77-09, Style 1) plastic package with three leads and an electrically isolated backside tab. Mounting requires thermal compound between the tab and heatsink to achieve the specified R_θJC.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Main current exit terminal; connected to most positive supply rail in high-side PNP switch configurations.
2 & 4	Collector	Common collector terminals (pins 2 and 4 are internally tied); primary current entry point and thermal path to heatsink via tab.
3	Base	Control input; negative-going signal relative to emitter turns device ON; requires current-limiting resistor in series.

Key Features

Feature	Design Value
Low V_CE(sat)	0.6 V max at 1 A enables <1 W conduction loss in 12–24 V load-switching circuits.
High SOA integrity	Second-breakdown-limited pulse curves support reliable 80 V × 3 A transient handling without destructive failure.
JEDEC-compliant h_FE	Specified down to 10 at 1 A ensures predictable base drive requirements for production-grade switching designs.
Pb-Free packaging	"G" suffix denotes RoHS-compliant lead-free finish, qualified per J-STD-609 and compatible with standard reflow profiles.
Wide T_J range	−65°C to +150°C operation supports deployment in automotive engine compartments and industrial control enclosures.

Applications

Industrial Power Supply Driver	DC Motor H-Bridge High-Side Switch
Use Scenario: Driving the high-side PNP transistor in a discrete 24 V/1 A linear regulator or pass element stage. IC Role / Device Role / Timing Role: PNP power switch controlling output voltage via emitter-follower configuration with feedback loop compensation. Use Value: 80 V V_CEO headroom accommodates 24 V rail transients; 0.6 V V_CE(sat) reduces dropout and thermal load at full load.	Use Scenario: Controlling one leg of a brushed DC motor H-bridge where bidirectional current flow requires complementary PNP/NPN pairs. IC Role / Device Role / Timing Role: High-side PNP switch enabling forward motor rotation when paired with NPN low-side complement (e.g., 2N4921). Use Value: Matched V_CEO/I_C ratings with 2N4921 allow symmetrical bridge design; TO-225 package enables identical thermal mounting for both sides.
Linear Audio Amplifier Output Stage	Relay/Valve Driver Interface
Use Scenario: Output emitter-follower stage in Class AB audio amplifiers delivering up to 1 A into 4 Ω loads. IC Role / Device Role / Timing Role: PNP output transistor providing current gain and low-output-impedance drive to speaker load. Use Value: f_T = 3 MHz supports full audio bandwidth (20 Hz–20 kHz) with stable phase margin; h_FE ≥ 10 ensures consistent bias stability at 1 A.	Use Scenario: Driving electromagnetic relays or solenoid valves requiring 500 mA–1 A coil current at 24–48 V. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to inductive load with flyback diode protection. Use Value: 30 W power rating allows brief 1 A surges during relay pull-in; 0.6 V V_CE(sat) keeps coil voltage drop below 0.7 V for reliable actuation.

Industrial Power Supply Driver

DC Motor H-Bridge High-Side Switch

Use Scenario: Driving the high-side PNP transistor in a discrete 24 V/1 A linear regulator or pass element stage.

IC Role / Device Role / Timing Role: PNP power switch controlling output voltage via emitter-follower configuration with feedback loop compensation.

Use Value: 80 V V_CEO headroom accommodates 24 V rail transients; 0.6 V V_CE(sat) reduces dropout and thermal load at full load.

Use Scenario: Controlling one leg of a brushed DC motor H-bridge where bidirectional current flow requires complementary PNP/NPN pairs.

IC Role / Device Role / Timing Role: High-side PNP switch enabling forward motor rotation when paired with NPN low-side complement (e.g., 2N4921).

Use Value: Matched V_CEO/I_C ratings with 2N4921 allow symmetrical bridge design; TO-225 package enables identical thermal mounting for both sides.

Linear Audio Amplifier Output Stage

Relay/Valve Driver Interface

Use Scenario: Output emitter-follower stage in Class AB audio amplifiers delivering up to 1 A into 4 Ω loads.

IC Role / Device Role / Timing Role: PNP output transistor providing current gain and low-output-impedance drive to speaker load.

Use Value: f_T = 3 MHz supports full audio bandwidth (20 Hz–20 kHz) with stable phase margin; h_FE ≥ 10 ensures consistent bias stability at 1 A.

Use Scenario: Driving electromagnetic relays or solenoid valves requiring 500 mA–1 A coil current at 24–48 V.

IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to inductive load with flyback diode protection.

Use Value: 30 W power rating allows brief 1 A surges during relay pull-in; 0.6 V V_CE(sat) keeps coil voltage drop below 0.7 V for reliable actuation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11G	TO-252 (DPAK), 80 V_CEO, 8 A I_C, 1.1 V V_CE(sat) @ 4 A - higher current, higher saturation voltage, surface-mount only.	Requires PCB redesign for SMT footprint; better suited for high-volume automated assembly than through-hole 2N4920G.	Select when board space is constrained and thermal management uses copper pour instead of external heatsink.
BD139	TO-126, 80 V_CEO, 1.5 A I_C, 0.5 V V_CE(sat) @ 1 A - lower power rating (12.5 W), smaller package, no Pb-Free "G" variant standard.	Limited to <12.5 W continuous use; unsuitable for 30 W thermal envelope or high-reliability industrial environments requiring RoHS compliance.	Select only for cost-sensitive, low-power consumer-grade replacements where full 2N4920G SOA is not required.

Compared with MJD44H11G and BD139, the 2N4920G provides the only through-hole, Pb-Free, 30 W-rated PNP option with verified 80 V SOA and 0.6 V saturation - making it uniquely suitable for legacy-compatible, thermally demanding, and RoHS-mandated industrial driver upgrades.

Availability

2N4920G is available at Aetrix Electronics and suitable for industrial power supplies, motor control modules, and relay driver circuits requiring stable component supply and long-term obsolescence mitigation.

Supply support for 2N4920G 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 logic solutions for automotive, industrial, and cloud infrastructure markets.

The 2N4920G belongs to the legacy 2N4918–2N4920 series of medium-power PNP transistors designed specifically for ruggedized driver-stage applications in industrial controls and power conversion systems.

FAQ

Is 2N4920G still in production or discontinued?

The 2N4920G is officially discontinued per onsemi's November 2025 datasheet revision (Rev. 14). However, Aetrix Electronics maintains legacy inventory and offers controlled distribution with full traceability, including date-code verification and original manufacturer packaging. Customers should plan for long-term design migration but can rely on Aetrix for interim supply continuity of the 2N4920G.

What is the maximum safe continuous collector current for 2N4920G?

The 2N4920G has two current ratings: 1.0 A is the JEDEC-specified continuous DC current under standardized test conditions, while 3.0 A reflects its actual physical current-handling capability shown in Figure 5 (SOA curve). For sustained operation, 1.0 A is the design limit unless thermal management ensures T_C ≤ 25°C and SOA constraints are strictly observed - the 2N4920G must never exceed 30 W total dissipation.

Does 2N4920G have a complementary NPN transistor?

Yes - the 2N4920G is explicitly designated as complementary to the NPN 2N4921, 2N4922, and 2N4923 transistors per the onsemi datasheet Features section. These share matching V_CEO ratings (80 V for 2N4920G/2N4923), TO-225 packaging, and coordinated SOA curves, enabling balanced push-pull or H-bridge designs where the 2N4920G serves as the high-side PNP switch alongside its NPN counterpart.

Can 2N4920G be used in switching power supplies?

Yes, the 2N4920G is qualified for switching applications with documented turn-on time <15 ns, fall time ≤0.7 µs, and storage time ≤0.5 µs at I_C = 100 mA. Its 3.0 MHz f_T and second-breakdown-limited SOA support operation up to ~100 kHz in hard-switched topologies. However, for >200 kHz or ZVS/ZCS designs, modern MOSFETs or IGBTs are preferred - the 2N4920G remains optimal for <100 kHz industrial SMPS auxiliary supplies and gate-drive stages.

What does the "G" suffix mean in 2N4920G?

The "G" suffix in 2N4920G indicates a Pb-Free (RoHS-compliant) package per onsemi's marking convention and soldering documentation. It confirms the device meets J-STD-609 requirements for lead-free terminations and is qualified for standard SnAgCu reflow profiles. The "G" does not denote a functional variant - all electrical and thermal specifications remain identical to non-G versions, with the sole difference being the finish composition of the TO-225 leads and tab.

2N4920G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 500µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 500mA, 1V

Power - Max:: 30 W

Frequency - Transition:: 3MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

2N4920G FAQ

1.How can I place an order for 2N4920G through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4920G 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 2N4920G reliable?

The price and inventory of 2N4920G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4920G is usually 5 days.

3.What payment methods are accepted for 2N4920G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4920G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4920G?

2N4920G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4920G 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 2N4920G?

For technical support, including 2N4920G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4920G requirements.

6.How does Aetrix verify that 2N4920G is sourced from the original manufacturer or authorized distributors?

All 2N4920G 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 2N4920G meets industry standards.

7.What is the process for return or replacement of 2N4920G?

All 2N4920G units undergo pre-shipment inspection (PSI). If there is an issue with 2N4920G, 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 2N4920G part is unused and in its original packaging.

Return procedure for 2N4920G:

1.Submit a request within 90 days.

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

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