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

onsemi 2N4402TF

Name: 2N4402TF
Brand: onsemi
SKU: 2N4402TF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4402TF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: 2N4402TF.pdf

Description:: TRANS PNP 40V 0.6A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N4402TF from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for amplification and switching applications up to 500 mA collector current. It features V_CEO = 40 V, V_CB0 = 40 V, V_EB0 = 5.0 V, h_FE = 30–150 (at I_C = 1–500 mA), and operates across –55°C to +150°C. It is commonly used in low-voltage DC-DC converter control stages and discrete logic-level signal inversion circuits.

For engineers reviewing the 2N4402TF datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package thermal resistance (R_θJA = 200°C/W), saturation voltage (V_CE(sat) = 0.40 V at I_C = 150 mA), and guaranteed h_FE minimum of 30 at low-current bias - critical for reliable turn-on in emitter-follower driver configurations.

Technical Context

The 2N4402TF operates as a standard PNP BJT with base-controlled current amplification and exhibits well-characterized saturation behavior under pulsed and DC conditions. Its small-signal h_fe ranges from 30 to 250 (I_C = 1–20 mA, f = 100 MHz), and output capacitance (C_ob = 8.5 pF at V_CB = 10 V) supports moderate-frequency switching up to ~10 MHz.

Switching performance is defined by delay time (t_d = 15 ns), rise time (t_r = 20 ns), storage time (t_s = 225 ns), and fall time (t_f = 30 ns) under specified test conditions (V_CC = 30 V, I_C = 150 mA). Thermal design must account for its 625 mW maximum power dissipation at 25°C, derating linearly at 5.0 mW/°C above ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in PNP switch topologies.
I_C (max)	600 mA - Continuous collector current rating; supports load switching up to ~500 mA with margin.
h_FE (min)	30 at I_C = 1 mA - Ensures predictable base drive requirement for low-power amplifier biasing.
V_CE(sat)	0.40 V at I_C = 150 mA, I_B = 15 mA - Low saturation voltage minimizes conduction loss in switching regulators.
T_J range	–55°C to +150°C - Enables operation in automotive under-hood and industrial control environments.
P_D (25°C)	625 mW - Total device dissipation; requires heatsinking or layout derating above 25°C ambient.
C_ob	8.5 pF at V_CB = 10 V - Limits high-frequency gain roll-off and affects switching edge fidelity.

Pinout & Package

2N4402TF is housed in a through-hole TO-92 package (3-lead, epoxy molded), with standardized lead orientation: Emitter (left), Base (center), Collector (right) when viewing the flat side with leads downward.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal for PNP operation	Connected to higher potential rail; base-emitter forward bias initiates conduction.
Base (B)	Control input for minority-carrier injection	Requires negative-going drive relative to emitter to turn on; typical R_B = 1–10 kΩ for saturation.
Collector (C)	Current sink terminal	Connected to load and lower-potential node; carries amplified emitter current minus base current.

Key Features

Feature	Design Value
Guaranteed h_FE spread	Min 30 at I_C = 1 mA ensures consistent bias point setting in linear amplifier designs.
Low V_CE(sat)	0.40 V at I_C = 150 mA reduces power loss and self-heating in high-duty-cycle switches.
High V_BR ratings	40 V V_CEO/V_CBO allows use in 24 V industrial control rails with safety margin.
Wide temperature range	–55°C to +150°C operation supports deployment in unheated outdoor enclosures and engine compartments.

Applications

DC-DC Converter Driver	Discrete Logic Inverter
Use Scenario: Driving gate of N-channel MOSFET in buck converter high-side configuration using charge pump or level-shifted base drive. IC Role / Device Role / Timing Role: PNP switch providing inverted, current-amplified gate control signal with fast turn-off (t_f = 30 ns). Use Value: Enables efficient, low-cost replacement of dedicated gate drivers in sub-1 A power stages.	Use Scenario: Converting TTL/CMOS logic levels to inverted open-collector outputs for LED indicators or relay coil control. IC Role / Device Role / Timing Role: Discrete inverter stage with h_FE ≥ 50 ensuring full saturation at 5 mA output load. Use Value: Eliminates need for integrated logic buffers in cost-sensitive industrial panel interfaces.
Linear Voltage Regulator Pass Element	Overcurrent Protection Switch
Use Scenario: Acting as series pass transistor in adjustable 3-terminal regulator designs with external feedback. IC Role / Device Role / Timing Role: Linear amplifier operating in active region with V_CE > 1 V and I_C < 300 mA. Use Value: Provides stable regulation with low noise and no switching artifacts in analog sensor supply rails.	Use Scenario: Current-limiting switch that disables load upon sensed overcurrent via emitter resistor feedback. IC Role / Device Role / Timing Role: Fast-turnoff PNP switch triggered by comparator output; t_s = 225 ns enables sub-microsecond fault response. Use Value: Delivers robust short-circuit protection without latch-up or thermal runaway in 12 V auxiliary supplies.

DC-DC Converter Driver

Discrete Logic Inverter

Use Scenario: Driving gate of N-channel MOSFET in buck converter high-side configuration using charge pump or level-shifted base drive.

IC Role / Device Role / Timing Role: PNP switch providing inverted, current-amplified gate control signal with fast turn-off (t_f = 30 ns).

Use Value: Enables efficient, low-cost replacement of dedicated gate drivers in sub-1 A power stages.

Use Scenario: Converting TTL/CMOS logic levels to inverted open-collector outputs for LED indicators or relay coil control.

IC Role / Device Role / Timing Role: Discrete inverter stage with h_FE ≥ 50 ensuring full saturation at 5 mA output load.

Use Value: Eliminates need for integrated logic buffers in cost-sensitive industrial panel interfaces.

Linear Voltage Regulator Pass Element

Overcurrent Protection Switch

Use Scenario: Acting as series pass transistor in adjustable 3-terminal regulator designs with external feedback.

IC Role / Device Role / Timing Role: Linear amplifier operating in active region with V_CE > 1 V and I_C < 300 mA.

Use Value: Provides stable regulation with low noise and no switching artifacts in analog sensor supply rails.

Use Scenario: Current-limiting switch that disables load upon sensed overcurrent via emitter resistor feedback.

IC Role / Device Role / Timing Role: Fast-turnoff PNP switch triggered by comparator output; t_s = 225 ns enables sub-microsecond fault response.

Use Value: Delivers robust short-circuit protection without latch-up or thermal runaway in 12 V auxiliary supplies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	V_CEO = 300 V, h_FE = 25–100, TO-92 package	Higher voltage rating but lower h_FE consistency at low I_C; less suitable for precision biasing.	Prefer when >100 V breakdown is required; avoid where tight h_FE matching matters.
BC557	V_CEO = 45 V, h_FE = 110–800, same TO-92 footprint	Higher gain spread and tighter V_CE(sat) spec (0.1 V typ), but lower max I_C (100 mA).	Choose for low-current amplification; not recommended for >200 mA switching loads.

Compared with MPSA92 and BC557, the 2N4402TF offers balanced trade-offs: sufficient voltage headroom (40 V), verified 500 mA switching capability, and predictable h_FE behavior across temperature - making it optimal for mid-power industrial control and legacy analog circuit replacements.

Availability

2N4402TF is available at Aetrix Electronics and suitable for industrial motor controls, legacy equipment repair, and discrete power management systems requiring stable component supply and long-term obsolescence mitigation.

Supply support for 2N4402TF 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The 2N4402TF belongs to Fairchild's legacy general-purpose BJT family, engineered for reliability in industrial automation, power conversion, and analog signal conditioning where proven discrete performance outweighs integration.

FAQ

What is the maximum continuous collector current rating for the 2N4402TF?

The 2N4402TF has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. Derating applies above ambient temperature - consult the thermal resistance (R_θJA = 200°C/W) and power dissipation curve to determine safe operating current at elevated temperatures. For sustained 500 mA operation, board-level thermal management is strongly advised.

Is the 2N4402TF pin-compatible with other TO-92 PNP transistors like the BC557 or MPSA92?

Yes, the 2N4402TF uses the standard TO-92 package with E-B-C lead assignment (Emitter left, Base center, Collector right when viewing flat side). This matches BC557 and MPSA92 pinouts, enabling direct PCB substitution. However, electrical differences - especially h_FE, V_CE(sat), and breakdown voltages - require validation in the target circuit before drop-in replacement.

What is the minimum DC current gain (h_FE) of the 2N4402TF at I_C = 10 mA?

The 2N4402TF guarantees a minimum h_FE of 50 at V_CE = 1.0 V and I_C = 10 mA per its official datasheet. This value is confirmed under standard test conditions and supports stable biasing in Class-A amplifier stages and medium-gain switching drivers where predictable base current is essential.

Can the 2N4402TF be used in switching applications above 1 MHz?

No - the 2N4402TF is not optimized for RF or high-speed switching. Its small-signal h_fe drops below unity above ~10 MHz, and storage time (t_s = 225 ns) limits practical switching frequency to ≤500 kHz in saturated-mode applications. For >1 MHz operation, consider RF-optimized PNP devices such as the MMBT2907A or SOT-23 packaged alternatives.

Does the 2N4402TF meet RoHS requirements?

Yes, the 2N4402TF is RoHS-compliant and lead-free, consistent with Fairchild's product transition completed prior to the 2016 acquisition. The "TF" suffix specifically denotes lead-free, halogen-free, and RoHS-compliant packaging - verified via material declarations and manufacturer certificates of compliance.

2N4402TF Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 150mA, 2V

Power - Max:: 625 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

2N4402TF FAQ

1.How can I place an order for 2N4402TF through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4402TF 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 2N4402TF reliable?

The price and inventory of 2N4402TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4402TF is usually 5 days.

3.What payment methods are accepted for 2N4402TF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4402TF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4402TF?

2N4402TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4402TF 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 2N4402TF?

For technical support, including 2N4402TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4402TF requirements.

6.How does Aetrix verify that 2N4402TF is sourced from the original manufacturer or authorized distributors?

All 2N4402TF 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 2N4402TF meets industry standards.

7.What is the process for return or replacement of 2N4402TF?

All 2N4402TF units undergo pre-shipment inspection (PSI). If there is an issue with 2N4402TF, 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 2N4402TF part is unused and in its original packaging.

Return procedure for 2N4402TF:

1.Submit a request within 90 days.

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

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