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

onsemi TIP29ATU

Name: TIP29ATU
Brand: onsemi
SKU: TIP29ATU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TIP29ATU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: TIP29ATU.pdf

Description:: TRANS NPN 60V 1A TO-220-3

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Product details

Overview

TIP29ATU from onsemi is an NPN silicon power transistor in a TO-220 package, rated for 60 V_CEO, 1.0 A continuous collector current, and 30 W total power dissipation at T_C = 25°C. It delivers DC current gain (h_FE) of 40–75 at I_C = 0.2 A, V_CE = 4.0 V, and supports general-purpose linear amplification and hard-switching applications in industrial power supplies and motor control stages.

For engineers reviewing the TIP29ATU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO = 60 V, I_C = 1.0 A, h_FE range, thermal resistance R_JC = 4.167 °C/W, and TO-220 mechanical compatibility with heatsink mounting.

Technical Context

The TIP29ATU operates as a medium-power bipolar junction transistor optimized for Class AB audio output stages and relay/LED driver switching circuits. Its safe operating area (SOA) is defined up to 1 ms pulse width at T_J = 150°C, with second-breakdown-limited boundaries distinct from thermally limited curves.

Electrical behavior is characterized by V_CE(sat) ≤ 0.7 V at I_C = 1.0 A and I_B = 125 mA, V_BE(on) ≤ 1.3 V under same conditions, and f_T = 3.0 MHz at I_C = 200 mA, V_CE = 10 V - confirming suitability for low-to-moderate frequency switching and analog amplification below 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter voltage before breakdown; defines maximum supply rail compatibility in amplifier or switch designs.
I_C (continuous)	1.0 A - Continuous collector current rating; sets upper limit for steady-state load drive capability.
P_D @ T_C = 25°C	30 W - Total power dissipation at case temperature 25°C; requires heatsinking for sustained operation above ~2 W ambient.
h_FE	40–75 - DC current gain at I_C = 0.2 A, V_CE = 4.0 V; determines base drive requirements for saturation or linear biasing.
R_JC	4.167 °C/W - Junction-to-case thermal resistance; enables calculation of junction temperature rise above heatsink temperature.
f_T	3.0 MHz - Transition frequency; confirms usable bandwidth for audio-frequency amplification and <1 MHz switching.

Pinout & Package

Package: TO-220 (Case 221A, Style 1), through-hole, single-ended heatsink-mountable plastic power package with integral metal tab (collector-connected).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires current-limited drive (max I_B = 0.4 A) to achieve full saturation or linear operation.
2 & 4	Collector	High-current output node; electrically connected to metal tab; must be isolated from heatsink unless circuit ground reference permits.
3	Emiter	Common emitter node; referenced to system ground or negative rail in common-emitter configurations.

Key Features

Feature	Design Value
Pb-Free & RoHS compliant	Meets EU Directive 2011/65/EU; eliminates lead-based solder concerns in modern assembly processes.
Unclamped inductive energy rating	32 mJ (tested at L_C = 20 mH, V_CC = 10 V, I_C = 1.8 A); supports robust switching into relay or solenoid loads without external snubbers.
Wide operating temperature range	–65°C to +150°C junction temperature; enables deployment in automotive under-hood or industrial ambient environments.
TO-220 mechanical standardization	Compatible with industry-standard heatsinks and mounting hardware; simplifies thermal design and mechanical integration.

Applications

Audio Power Amplifier Output Stage	DC Motor Driver (Low-Power)
Use Scenario: Final push-pull stage in 5–10 W Class AB audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power transistor delivering amplified current to speaker load; paired with complementary PNP (e.g., TIP30A) in quasi-complementary topology. Use Value: V_CEO = 60 V and h_FE ≥ 40 ensure stable biasing and low distortion at 1 A peak swing; SOA supports transient speaker impedance dips.	Use Scenario: H-bridge half-bridge leg or single-direction driver for brushed DC motors ≤ 24 V, ≤ 1 A. IC Role / Device Role / Timing Role: Switching element controlling motor current flow; operated in saturation (V_CE(sat) ≤ 0.7 V) to minimize conduction loss. Use Value: 32 mJ unclamped inductive energy rating allows direct drive of motor windings without flyback diode derating; TO-220 tab enables bolt-on heatsinking.
Relay/Solenoid Driver	Linear Voltage Regulator Pass Element
Use Scenario: Driving 12–24 V DC relays or solenoids with coil currents up to 1 A in PLC I/O modules. IC Role / Device Role / Timing Role: High-side or low-side switch interfacing microcontroller GPIO to inductive load; base driven via current-limiting resistor. Use Value: V_CEO = 60 V exceeds typical relay supply rails; built-in energy handling reduces need for external clamping components.	Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 1 A at ≤ 50 V input-output differential. IC Role / Device Role / Timing Role: Current-controlled series element dissipating excess voltage as heat; biased in active region for regulation. Use Value: R_JC = 4.167 °C/W and 30 W P_D enable regulated output at >10 W dissipation with appropriate heatsinking; h_FE stability ensures predictable loop gain.

Audio Power Amplifier Output Stage

DC Motor Driver (Low-Power)

Use Scenario: Final push-pull stage in 5–10 W Class AB audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power transistor delivering amplified current to speaker load; paired with complementary PNP (e.g., TIP30A) in quasi-complementary topology.

Use Value: V_CEO = 60 V and h_FE ≥ 40 ensure stable biasing and low distortion at 1 A peak swing; SOA supports transient speaker impedance dips.

Use Scenario: H-bridge half-bridge leg or single-direction driver for brushed DC motors ≤ 24 V, ≤ 1 A.

IC Role / Device Role / Timing Role: Switching element controlling motor current flow; operated in saturation (V_CE(sat) ≤ 0.7 V) to minimize conduction loss.

Use Value: 32 mJ unclamped inductive energy rating allows direct drive of motor windings without flyback diode derating; TO-220 tab enables bolt-on heatsinking.

Relay/Solenoid Driver

Linear Voltage Regulator Pass Element

Use Scenario: Driving 12–24 V DC relays or solenoids with coil currents up to 1 A in PLC I/O modules.

IC Role / Device Role / Timing Role: High-side or low-side switch interfacing microcontroller GPIO to inductive load; base driven via current-limiting resistor.

Use Value: V_CEO = 60 V exceeds typical relay supply rails; built-in energy handling reduces need for external clamping components.

Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 1 A at ≤ 50 V input-output differential.

IC Role / Device Role / Timing Role: Current-controlled series element dissipating excess voltage as heat; biased in active region for regulation.

Use Value: R_JC = 4.167 °C/W and 30 W P_D enable regulated output at >10 W dissipation with appropriate heatsinking; h_FE stability ensures predictable loop gain.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955T4G	PNP complement (not NPN); TO-220 package; V_CEO = 60 V, I_C = 12 A, higher gain but different polarity.	Not interchangeable as direct NPN replacement; used only in complementary pair configurations where PNP is required.	Select only when building matched NPN/PNP output stages; verify layout accommodates PNP pinout inversion.
TIP31A	NPN, same TO-220 package; V_CEO = 60 V, I_C = 3.0 A, h_FE = 10–50 - higher current rating but lower minimum gain.	Acceptable for higher-current switching where gain margin is less critical; requires recalculation of base drive network.	Prefer when load current exceeds 1 A; confirm SOA and thermal design accommodate higher I_C derating.

Compared with TIP29ATU, TIP31A offers triple the continuous current but reduced h_FE consistency, while MJD2955T4G serves a complementary role rather than substitution - making TIP29ATU optimal for precision-gain, 1 A-class linear and switching tasks where thermal and gain stability are prioritized.

Availability

TIP29ATU is available at Aetrix Electronics and suitable for audio amplifier output stages, DC motor drivers, relay interface circuits, and linear regulator pass elements requiring stable component supply and long-term manufacturability.

Supply support for TIP29ATU 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The TIP29ATU belongs to onsemi's legacy silicon power transistor family designed for cost-sensitive, high-reliability general-purpose amplification and switching - emphasizing ruggedness, thermal robustness, and broad SOA in standardized packages.

FAQ

What is the maximum collector-emitter voltage rating for the TIP29ATU?

The TIP29ATU has a maximum collector-emitter sustaining voltage (V_CEO(sus)) of 60 Vdc at I_C = 30 mA and I_B = 0. This rating defines the absolute upper limit for DC voltage applied between collector and emitter before device breakdown occurs. Exceeding this voltage risks irreversible damage. The TIP29ATU datasheet specifies this value under standardized test conditions and confirms it applies specifically to the TIP29ATU variant within the TIP29x family.

Does the TIP29ATU have a Pb-free package?

Yes, the TIP29ATU features a Pb-free (RoHS-compliant) TO-220 package, as confirmed by the "G" suffix in its full orderable part number and explicitly stated in the onsemi datasheet revision history. The device meets EU Directive 2011/65/EU requirements, and no lead-based solder is used in its termination or packaging. This makes the TIP29ATU suitable for modern lead-free reflow and wave soldering processes without modification.

What is the thermal resistance from junction to case for the TIP29ATU?

The TIP29ATU has a thermal resistance from junction to case (R_JC) of 4.167 °C/W, measured under specified test conditions per the onsemi datasheet. This value enables accurate prediction of junction temperature rise above the case (heatsink) temperature during operation. For example, at 10 W dissipation, the junction will run approximately 41.7°C hotter than the case. This parameter is critical for heatsink sizing and reliability validation in the TIP29ATU application.

Can the TIP29ATU be used in switching applications with inductive loads?

Yes, the TIP29ATU is rated for 32 mJ of unclamped inductive load energy under defined test conditions (L_C = 20 mH, V_CC = 10 V, I_C = 1.8 A, PRF = 10 Hz). This specification validates its ability to safely absorb turn-off energy from relays, solenoids, and small motors without external snubbers. However, designers must ensure operating conditions remain within the SOA curves in Figure 5 of the TIP29ATU datasheet to avoid second breakdown.

What are the pin assignments for the TIP29ATU in the TO-220 package?

The TIP29ATU uses TO-220 Case 221A Style 1 pinout: Pin 1 is Base, Pins 2 and 4 are Collector (internally connected to the metal tab), and Pin 3 is Emitter. This configuration is standardized across the TIP29x series and documented in the official onsemi datasheet. The collector-tab connection means electrical isolation from the heatsink is mandatory unless the heatsink is tied to the collector potential - a critical layout consideration for the TIP29ATU.

TIP29ATU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 125mA, 1A

Current - Collector Cutoff (Max):: 300µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 15 @ 1A, 4V

Power - Max:: 2 W

Frequency - Transition:: 3MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

TIP29ATU FAQ

1.How can I place an order for TIP29ATU through Aetrix?

Please submit a Request for Quotation (RFQ) for TIP29ATU 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 TIP29ATU reliable?

The price and inventory of TIP29ATU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIP29ATU is usually 5 days.

3.What payment methods are accepted for TIP29ATU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIP29ATU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TIP29ATU?

TIP29ATU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TIP29ATU 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 TIP29ATU?

For technical support, including TIP29ATU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIP29ATU requirements.

6.How does Aetrix verify that TIP29ATU is sourced from the original manufacturer or authorized distributors?

All TIP29ATU 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 TIP29ATU meets industry standards.

7.What is the process for return or replacement of TIP29ATU?

All TIP29ATU units undergo pre-shipment inspection (PSI). If there is an issue with TIP29ATU, 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 TIP29ATU part is unused and in its original packaging.

Return procedure for TIP29ATU:

1.Submit a request within 90 days.

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

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