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

onsemi TIP49

Name: TIP49
Brand: onsemi
SKU: TIP49
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TIP49

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: TIP49.pdf

Description:: TRANS NPN 350V 1A TO-220-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,725

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Product details

Overview

TIP49 from STMicroelectronics is a silicon NPN planar transistor in TO-220 package, designed for high-voltage linear and switching applications. It features V_CEO = 350 V, I_C = 1 A, P_tot = 40 W at T_case ≤ 25 °C, V_CE(sat) = 1 V at I_C = 1 A / I_B = 0.2 A, and h_FE ≥ 30 at I_C = 0.3 A - used in relay drivers, power supply switching stages, and motor control interfaces.

For engineers reviewing the TIP49 datasheet, TIP49 pinout, TIP49 application, or TIP49 equivalent, key selection considerations include its 350 V collector-emitter sustaining voltage, 40 W thermal dissipation capability, TO-220 mechanical mounting compatibility, and DC current gain behavior across 0.3–1 A operating range.

Technical Context

The TIP49 operates as a medium-power NPN bipolar junction transistor with multiepitaxial planar construction, enabling stable gain and rugged switching under high-voltage transient conditions. Its design supports both active-region amplification and saturated-switching modes, with specified V_CEO(sus) = 350 V and pulsed V_CE(sat) = 1 V at 300 µs/2% duty cycle.

Thermal performance is defined by R_thj-case = 3.125 °C/W and R_thj-amb = 62.5 °C/W, requiring heatsinking for sustained >10 W operation. Electrical characterization includes h_FE min 30 (I_C = 0.3 A), f_T = 10 MHz, and ICEO ≤ 1 mA at V_CE = 250 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 V - maximum continuous collector-emitter voltage before breakdown in open-base condition
I_C	1 A - continuous DC collector current rating at T_case ≤ 25 °C
P_tot	40 W - total power dissipation limit with case temperature held at 25 °C
V_CE(sat)	1 V - collector-emitter voltage drop when fully saturated at I_C = 1 A, I_B = 0.2 A
h_FE	30–150 - DC current gain range at I_C = 0.3 A and I_C = 1 A respectively
R_thj-case	3.125 °C/W - thermal resistance from junction to case, defining heatsink interface requirement

Pinout & Package

Package: TO-220 plastic housing with vertical mounting orientation, metal tab electrically connected to collector, standardized for PCB through-hole or heatsink-mount assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Low-impedance output node for current return path; electrically isolated from tab
2 (Base)	Control input	Current-driven gate requiring ~0.2 A for full saturation at 1 A collector load
3 (Collector)	High-voltage output	Connected internally to metal tab; must be insulated from heatsink unless common-collector configuration used

Key Features

Feature	Design Value
High-voltage blocking capability	V_CBO = 450 V enables use in 300 V DC bus switching without derating
Saturated switching performance	V_CE(sat) ≤ 1 V at I_C = 1 A reduces conduction loss in PWM-driven loads
Robust thermal interface	R_thj-case = 3.125 °C/W allows direct mounting to aluminum heatsinks ≥ 100 cm²
Wide DC gain range	h_FE = 30–150 supports consistent biasing across production lots and temperature

Applications

Relay Driver Stage

DC Motor On/Off Control

Use Scenario: Driving 24–48 V coil relays in industrial PLC output modules.

IC Role / Device Role / Timing Role: NPN switch providing galvanically isolated coil energization via base-current control.

Use Value: 350 V V_CEO withstands inductive kickback up to 300 V, eliminating need for external snubbers.

Use Scenario: Controlling brushed DC motors in HVAC actuators and valve positioners.

IC Role / Device Role / Timing Role: Single-pole high-side or low-side switch enabling ON/OFF state transitions.

Use Value: 40 W power handling supports 1 A continuous motor stall current without thermal shutdown.

Linear Regulator Pass Element

Switch-Mode Power Supply Switch

Use Scenario: Series pass transistor in adjustable 0–30 V, 1 A bench power supplies.

IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with emitter-follower configuration.

Use Value: h_FE ≥ 30 ensures stable loop gain with minimal base drive circuitry.

Use Scenario: Primary-side switching element in offline flyback converters up to 50 kHz.

IC Role / Device Role / Timing Role: Hard-switched BJT toggling between cutoff and saturation during PWM cycles.

Use Value: 10 MHz f_T supports clean turn-on/turn-off edges below 50 kHz switching frequency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE13003	V_CEO = 400 V, I_C = 1.5 A, TO-126 package, lower h_FE (min 5) at I_C = 1 A	Higher current rating but smaller package limits thermal mass; requires tighter heatsinking	Prefer when higher peak current needed and board space constrains TO-220 footprint
BD241C	V_CEO = 100 V, I_C = 6 A, TO-220, h_FE = 25–250, lower voltage rating	Optimized for low-voltage, high-current loads; unsuitable for >120 V bus applications	Select only for 24–48 V systems where gain linearity and surge current matter more than voltage headroom

Compared with MJE13003 and BD241C, the TIP49 uniquely balances 350 V blocking, 1 A continuous current, TO-220 thermal robustness, and predictable h_FE - making it optimal for mid-voltage industrial switching where reliability under transient stress is critical.

Availability

TIP49 is available at Aetrix Electronics and suitable for relay driver circuits, linear regulator pass elements, DC motor control interfaces, and flyback converter primary switches requiring stable component supply and long-term industrial availability.

Supply support for TIP49 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

The TIP47–TIP50 series belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for ruggedized linear and switching applications in industrial power conversion, control, and protection systems.

FAQ

Is the TIP49 pin-compatible with TIP47, TIP48, or TIP50?

Yes - all four devices share identical TO-220 pinout (E-B-C), same mechanical dimensions, and collector-tab connection. However, absolute maximum ratings differ: TIP49 has V_CEO = 350 V and V_CBO = 450 V, placing it between TIP48 (300 V / 400 V) and TIP50 (400 V / 500 V). Substitution requires verifying voltage margin in the target circuit.

What is the recommended heatsink size for continuous 1 A operation?

At I_C = 1 A and V_CE(sat) ≈ 1 V, power dissipation is ~1 W - well within the 40 W rating. But ambient temperature and enclosure airflow matter: for T_amb = 50 °C and no forced air, a 50 cm² aluminum heatsink (R_th ≈ 20 °C/W) keeps junction temperature below 125 °C. Derate linearly above 25 °C case temperature.

Can TIP49 be used in avalanche mode?

No - the TIP49 is not rated or characterized for controlled avalanche operation. Its V_CEO(sus) = 350 V is a sustaining voltage under pulsed test conditions (300 µs, 2% duty), not an avalanche energy rating. For inductive load switching, always use clamping diodes or RC snubbers to limit V_CE spikes to ≤ 300 V.

Does the metal tab connect to collector, emitter, or base?

The metal tab is internally connected to the collector terminal - confirmed by STMicroelectronics mechanical drawings and continuity testing. When mounted to a heatsink, electrical isolation (e.g., mica washer + shoulder washer) is mandatory unless the heatsink is held at collector potential. Pin 3 (collector) and the tab are electrically identical.

TIP49 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 350 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 200mA, 1A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 300mA, 10V

Power - Max:: 2 W

Frequency - Transition:: 10MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

TIP49 FAQ

1.How can I place an order for TIP49 through Aetrix?

Please submit a Request for Quotation (RFQ) for TIP49 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 TIP49 reliable?

The price and inventory of TIP49 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIP49 is usually 5 days.

3.What payment methods are accepted for TIP49?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIP49 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TIP49?

TIP49 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TIP49 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 TIP49?

For technical support, including TIP49 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIP49 requirements.

6.How does Aetrix verify that TIP49 is sourced from the original manufacturer or authorized distributors?

All TIP49 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 TIP49 meets industry standards.

7.What is the process for return or replacement of TIP49?

All TIP49 units undergo pre-shipment inspection (PSI). If there is an issue with TIP49, 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 TIP49 part is unused and in its original packaging.

Return procedure for TIP49:

1.Submit a request within 90 days.

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

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