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

onsemi BD17516STU

Name: BD17516STU
Brand: onsemi
SKU: BD17516STU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD17516STU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BD17516STU.pdf

Description:: TRANS NPN 45V 3A TO-126-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD17516STU from onsemi is an NPN silicon power transistor in TO-225 package, rated for 80 V_CEO, 3.0 A_C, and 30 W dissipation at T_C = 25°C. It delivers h_FE ≥ 63 at I_C = 0.15 A and supports audio amplifier driver stages in complementary quasi-complementary output stages.

For engineers reviewing the BD17516STU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/V_CBO rating, DC current gain linearity across I_C, safe operating area (SOA) limits, thermal resistance R_JC = 4.16°C/W, and Pb-free TO-225 mechanical compatibility.

Technical Context

This device operates as a medium-power linear amplifying element with specified SOA boundaries up to 150°C junction temperature. Its f_T = 3.0 MHz and V_CE(sat) ≤ 0.8 V at I_C = 1.0 A / I_B = 0.1 A define switching and analog gain bandwidth constraints.

The BD17516STU exhibits h_FE variation from 15–160 across I_C = 0.15–1.0 A at V_CE = 2.0 V, and maintains V_BE(on) ≤ 1.3 V under same conditions - critical for bias network design in Class AB audio stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum collector-emitter voltage before breakdown; sets rail voltage ceiling in audio output stages.
I_C	3.0 A - Continuous collector current limit; defines peak output capability in 5–10 W amplifier designs.
P_D @ T_C = 25°C	30 W - Total power dissipation at case temperature 25°C; requires heatsinking for sustained operation.
h_FE @ I_C = 0.15 A	63–160 - DC current gain range; enables stable biasing in low-to-mid current driver nodes.
R_JC	4.16°C/W - Junction-to-case thermal resistance; determines minimum heatsink thermal impedance needed to hold T_J ≤ 150°C.
f_T	3.0 MHz - Current-gain bandwidth product; constrains usable frequency range in RF-coupled or wideband audio drivers.

Pinout & Package

BD17516STU uses the TO-225 package (Case 77, Style 1), with metal tab electrically connected to collector. The package features three leads in-line, with standardized pin numbering visible from front view.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Reference node for base drive and current return path; connects to emitter resistor or bootstrap capacitor in quasi-complementary topologies.
2 & 4	Collector	Shared collector terminal (pins 2 and 4 are internally bonded); ties directly to heatsink and output load in Class AB output stages.
3	Base	Control input for current amplification; requires current-limited drive due to I_B(max) = 1.0 A specification.

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 63 at I_C = 0.15 A - reduces base drive current demand and improves efficiency in low-power driver sections.
Complementary pairing	Designed as NPN counterpart to BD180 PNP - enables matched push-pull stage construction with symmetrical gain and thermal tracking.
Pb-free RoHS compliance	G-suffix marking indicates lead-free termination and halogen-free molding compound - satisfies industrial and consumer environmental compliance requirements.
Robust SOA	Defined secondary breakdown and thermal limitation curves up to 150°C - supports reliable operation in pulse-loaded audio output applications.

Applications

Audio Power Amplifier Output Stage	Quasi-Complementary Driver Circuit
Use Scenario: Final output stage in 5–10 W stereo audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power switch delivering amplified current to speaker load; operates in linear Class AB mode. Use Value: V_CEO = 80 V and I_C = 3.0 A enable ±35 V rail operation with headroom for transient peaks without clipping or breakdown.	Use Scenario: Driver stage preceding complementary output transistors in discrete amplifier designs. IC Role / Device Role / Timing Role: Medium-current gain block providing base drive to output devices while isolating preamp from load. Use Value: h_FE ≥ 63 at I_C = 0.15 A ensures sufficient current gain to drive multiple output transistor bases without excessive preamp loading.
DC Motor Speed Control	Linear Regulator Pass Element
Use Scenario: PWM-controlled H-bridge half-bridge leg in 12–24 V brushed DC motor systems. IC Role / Device Role / Timing Role: High-current switching element handling bidirectional motor current during active conduction. Use Value: R_JC = 4.16°C/W and SOA-defined pulse limits allow safe operation at 100% duty cycle up to 2.0 A continuous with appropriate heatsinking.	Use Scenario: Series pass transistor in adjustable linear voltage regulators delivering up to 2.5 A load current. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential voltage. Use Value: V_CE(sat) ≤ 0.8 V at I_C = 1.0 A minimizes dropout voltage and thermal stress under full-load conditions.

Audio Power Amplifier Output Stage

Quasi-Complementary Driver Circuit

Use Scenario: Final output stage in 5–10 W stereo audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power switch delivering amplified current to speaker load; operates in linear Class AB mode.

Use Value: V_CEO = 80 V and I_C = 3.0 A enable ±35 V rail operation with headroom for transient peaks without clipping or breakdown.

Use Scenario: Driver stage preceding complementary output transistors in discrete amplifier designs.

IC Role / Device Role / Timing Role: Medium-current gain block providing base drive to output devices while isolating preamp from load.

Use Value: h_FE ≥ 63 at I_C = 0.15 A ensures sufficient current gain to drive multiple output transistor bases without excessive preamp loading.

DC Motor Speed Control

Linear Regulator Pass Element

Use Scenario: PWM-controlled H-bridge half-bridge leg in 12–24 V brushed DC motor systems.

IC Role / Device Role / Timing Role: High-current switching element handling bidirectional motor current during active conduction.

Use Value: R_JC = 4.16°C/W and SOA-defined pulse limits allow safe operation at 100% duty cycle up to 2.0 A continuous with appropriate heatsinking.

Use Scenario: Series pass transistor in adjustable linear voltage regulators delivering up to 2.5 A load current.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential voltage.

Use Value: V_CE(sat) ≤ 0.8 V at I_C = 1.0 A minimizes dropout voltage and thermal stress under full-load conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD179G	Identical electrical specs, same TO-225 package, Pb-free marking; BD17516STU is functionally identical variant per onsemi documentation.	No functional difference; both rated for 80 V, 3.0 A, 30 W, and share identical SOA and gain curves.	Select BD17516STU when sourcing matches OEM BOMs specifying that exact part number; BD179G is acceptable where cross-reference is permitted.
MJE172	Higher V_CEO = 100 V, lower h_FE min = 30, same TO-225 package; R_JC = 4.2°C/W nearly identical.	Preferred in higher-voltage supply rails (>±40 V) or where wider V_CEO margin is required; less suitable for low-distortion audio due to lower gain linearity.	Choose MJE172 only if system requires >80 V breakdown margin; BD17516STU remains optimal for standard 5–10 W audio designs with tight gain control needs.

Compared with BD179G, BD17516STU offers identical performance and drop-in mechanical fit; versus MJE172, BD17516STU provides superior h_FE consistency at low currents but narrower voltage headroom - making it better suited for cost-sensitive, rail-constrained audio driver roles.

Availability

BD17516STU is available at Aetrix Electronics and suitable for audio amplifier output stages, quasi-complementary driver circuits, and linear regulator pass elements requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for BD17516STU 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 focused on energy-efficient technologies for automotive, industrial, cloud, medical, and IoT applications.

BD17516STU belongs to onsemi's legacy power bipolar transistor family designed specifically for medium-power linear amplification and switching in audio, motor control, and power regulation systems.

FAQ

What is the maximum collector-emitter voltage rating for BD17516STU?

The BD17516STU has a maximum collector-emitter sustaining voltage V_(BR)CEO of 80 Vdc at I_C = 0.1 Adc and I_B = 0. This rating defines the absolute upper limit for DC or peak AC voltage applied between collector and emitter before breakdown occurs, and must not be exceeded in circuit design.

Does BD17516STU have a complementary PNP counterpart?

Yes, the BD17516STU is explicitly designed as the NPN complement to the BD180 PNP transistor. Both share matching voltage ratings, current capabilities, and thermal characteristics, enabling balanced push-pull amplifier configurations with symmetrical distortion and thermal behavior.

What is the thermal resistance from junction to case for BD17516STU?

The BD17516STU has a maximum junction-to-case thermal resistance R_JC of 4.16°C/W. This value is measured under specified test conditions and determines the minimum thermal impedance required between the TO-225 metal tab and heatsink to maintain junction temperature within the –65°C to +150°C operating range.

Can BD17516STU be used in switching applications?

Yes, BD17516STU supports switching use cases such as DC motor control and relay drivers, provided operating conditions remain within its Safe Operating Area (SOA) curves - especially respecting secondary breakdown limits at high V_CE/I_C combinations and adhering to pulse width/duty cycle constraints shown in Figure 1.

Is BD17516STU RoHS compliant and lead-free?

Yes, BD17516STU is Pb-free and RoHS compliant, indicated by the "G" suffix in its marking and confirmed in onsemi's official documentation. It uses halogen-free molding compound and meets JEDEC J-STD-609 Category 1 moisture sensitivity level requirements.

BD17516STU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Last Time Buy

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 3 A

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 800mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 2V

Power - Max:: 30 W

Frequency - Transition:: 3MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126-3

BD17516STU FAQ

1.How can I place an order for BD17516STU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD17516STU 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 BD17516STU reliable?

The price and inventory of BD17516STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD17516STU is usually 5 days.

3.What payment methods are accepted for BD17516STU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD17516STU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD17516STU?

BD17516STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD17516STU 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 BD17516STU?

For technical support, including BD17516STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD17516STU requirements.

6.How does Aetrix verify that BD17516STU is sourced from the original manufacturer or authorized distributors?

All BD17516STU 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 BD17516STU meets industry standards.

7.What is the process for return or replacement of BD17516STU?

All BD17516STU units undergo pre-shipment inspection (PSI). If there is an issue with BD17516STU, 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 BD17516STU part is unused and in its original packaging.

Return procedure for BD17516STU:

1.Submit a request within 90 days.

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

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