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

onsemi 2SD1815T-E

Name: 2SD1815T-E
Brand: onsemi
SKU: 2SD1815T-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1815T-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: 2SD1815T-E.pdf

Description:: TRANS NPN 100V 3A TP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SD1815T-E from onsemi is an NPN bipolar junction transistor (BJT) designed for high-current switching applications, featuring V_CEO = 100 V, I_C = 3 A, V_CE(sat) = –150 mV (typ) at I_C = –1.5 A / I_B = –0.15 A, f_T = 180 MHz, and housed in the TP (TO-251) package with 4-pin single-lead configuration.

For engineers reviewing the 2SD1815T-E datasheet, pinout, applications, or equivalent options, this device is selected for relay drivers, DC-DC converters, and high-speed inverters where low saturation voltage, fast switching (t_on = 100 ns, t_f = 50 ns), and robust thermal performance (T_j = 150 °C) are critical.

Technical Context

The 2SD1815T-E operates as a general-purpose NPN switching transistor with a rated collector-emitter breakdown voltage of 100 V and continuous collector current up to 3 A. Its low V_CE(sat) enables reduced conduction losses in power-switching topologies.

It delivers high-frequency capability via f_T = 180 MHz and exhibits excellent h_FE linearity across I_C = 0.5–2 A, supporting stable gain-controlled amplification or precision switching. The device uses a TP (TO-251) surface-mount package with two collector terminals for enhanced current handling and thermal dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Maximum safe collector-emitter voltage before avalanche; supports 48 V and 100 V bus-level switching.
I_C (cont)	3 A - Continuous collector current rating; enables use in medium-power load switching without forced cooling.
V_CE(sat)	–150 mV (typ) at I_C = –1.5 A / I_B = –0.15 A - Low conduction loss reduces heat generation and improves efficiency in saturated switch mode.
f_T	180 MHz - Gain-bandwidth product enabling reliable operation in high-speed switching circuits up to ~10–20 MHz practical frequency range.
t_on/t_f	100 ns / 50 ns - Fast turn-on and fall times support PWM frequencies >1 MHz in converter designs with minimal switching loss.
h_FE	200–400 (Rank T) at V_CE = –5 V, I_C = –0.5 A - Tight DC current gain distribution ensures predictable base drive requirements.
P_C (T_c=25°C)	20 W - High case-power dissipation supports high-duty-cycle operation when mounted on heatsinked PCBs.

Pinout & Package

Package: TP (TO-251), 4-pin single-lead surface-mount package with dual collector terminals for improved current sharing and thermal path. Dimensions: 7.0 × 5.0 × 2.3 mm (L × W × H), mass = 0.315 g.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input node; requires ~0.15 A base current to saturate at 1.5 A collector load.
2 & 4	Collector	Dual collector terminals electrically connected internally; reduce current density and improve thermal spreading to PCB copper.
3	Emiter	Common emitter reference; tied to ground or low-side return path in typical switch configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	–150 mV typ at I_C = –1.5 A - Reduces I²R losses by >40% vs. standard BJTs with V_CE(sat) > 250 mV.
High f_T	180 MHz - Enables clean square-wave switching in SMPS and motor gate-drive pre-driver stages.
Fast switching	t_on = 100 ns, t_f = 50 ns - Supports >1 MHz PWM with minimal dead-time distortion and reduced EMI.
Halogen-free & Pb-free	Compliant with JEDEC J-STD-609A Class 1 and RoHS Directive 2011/65/EU - Suitable for green manufacturing and export compliance.
TP package thermal design	20 W power dissipation at T_c = 25°C - Achieved via exposed collector pads (pins 2 & 4) soldered directly to large copper areas.

Applications

Industrial Relay Drivers	DC-DC Converter Switches
Use Scenario: Driving 24 V / 2 A electromagnetic relays in PLC I/O modules with microcontroller GPIO output. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current; operated in saturation mode with fixed base resistor bias. Use Value: Low V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at low supply margins; dual collector pins aid thermal management during repeated actuation.	Use Scenario: High-side or low-side switching element in non-isolated buck converters delivering 5–12 V @ 2 A from 24 V input. IC Role / Device Role / Timing Role: Main power switch operating in hard-switched PWM mode at 200–500 kHz. Use Value: Fast t_f = 50 ns limits switching loss; f_T = 180 MHz ensures sufficient gain margin for stable base drive loop response.
High-Speed Inverters	Motor Control Pre-Drivers
Use Scenario: Push-pull stage in compact 100 W audio or ultrasonic inverter driving piezoelectric transducers. IC Role / Device Role / Timing Role: Complementary NPN switch paired with 2SB1215T-E PNP in Class B or AB topology. Use Value: Matched h_FE linearity and symmetric switching speed (vs. 2SB1215T-E) minimize crossover distortion and thermal imbalance.	Use Scenario: Level-shifting and current-amplifying pre-driver for high-voltage MOSFETs in 3-phase BLDC motor gate control. IC Role / Device Role / Timing Role: Base driver for external power devices; handles peak currents up to 6 A (pulse). Use Value: I_CP = 6 A rating supports transient gate charge demands; TO-251 footprint allows dense layout near power FETs.

Industrial Relay Drivers

DC-DC Converter Switches

Use Scenario: Driving 24 V / 2 A electromagnetic relays in PLC I/O modules with microcontroller GPIO output.

IC Role / Device Role / Timing Role: NPN switch controlling relay coil current; operated in saturation mode with fixed base resistor bias.

Use Value: Low V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at low supply margins; dual collector pins aid thermal management during repeated actuation.

Use Scenario: High-side or low-side switching element in non-isolated buck converters delivering 5–12 V @ 2 A from 24 V input.

IC Role / Device Role / Timing Role: Main power switch operating in hard-switched PWM mode at 200–500 kHz.

Use Value: Fast t_f = 50 ns limits switching loss; f_T = 180 MHz ensures sufficient gain margin for stable base drive loop response.

High-Speed Inverters

Motor Control Pre-Drivers

Use Scenario: Push-pull stage in compact 100 W audio or ultrasonic inverter driving piezoelectric transducers.

IC Role / Device Role / Timing Role: Complementary NPN switch paired with 2SB1215T-E PNP in Class B or AB topology.

Use Value: Matched h_FE linearity and symmetric switching speed (vs. 2SB1215T-E) minimize crossover distortion and thermal imbalance.

Use Scenario: Level-shifting and current-amplifying pre-driver for high-voltage MOSFETs in 3-phase BLDC motor gate control.

IC Role / Device Role / Timing Role: Base driver for external power devices; handles peak currents up to 6 A (pulse).

Use Value: I_CP = 6 A rating supports transient gate charge demands; TO-251 footprint allows dense layout near power FETs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	V_CEO = 100 V, I_C = 2 A, V_CE(sat) = 1.5 V (max) at I_C = 1.5 A - higher saturation voltage, lower current rating.	Limited to ≤1.5 A continuous loads; less suitable for 3 A relay or converter primary switches.	Select 2SD1815T-E when ≥3 A continuous current and <200 mV V_CE(sat) are required.
SS8050LT1G	V_CEO = 25 V, I_C = 1.5 A, SOT-23 package - significantly lower voltage/current ratings and no dual-collector thermal advantage.	Only appropriate for low-voltage logic-level switching; incompatible with 48–100 V bus applications.	Choose 2SD1815T-E for industrial-grade 100 V, 3 A switching where SS8050LT1G lacks voltage headroom and thermal capacity.

Compared with MJD127G and SS8050LT1G, the 2SD1815T-E provides superior current handling, lower conduction loss, and TO-251 thermal robustness-making it the preferred choice for 24–100 V industrial switching where reliability under sustained load is critical.

Availability

2SD1815T-E is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converters, high-speed inverters, and motor control pre-drivers requiring stable component supply and long-term manufacturability.

Supply support for 2SD1815T-E 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 management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.

The 2SD1815T-E belongs to onsemi's general-purpose bipolar transistor family engineered for high-reliability industrial switching-designed to replace legacy through-hole devices with surface-mount equivalents offering tighter parametric consistency and halogen-free compliance.

FAQ

What is the maximum continuous collector current rating for the 2SD1815T-E?

The 2SD1815T-E has a maximum continuous collector current (I_C) rating of 3 A at T_a = 25 °C. Derating applies above ambient temperature; at T_c = 25 °C, it supports up to 20 W dissipation. This rating is confirmed in the official onsemi datasheet No. 2539-1/7 and validated across production lots.

Does the 2SD1815T-E have pin-to-pin compatibility with other variants in the 2SD1815 family?

Yes-the 2SD1815T-E shares identical TP (TO-251) package dimensions, pinout (Base–Collector–Emitter–Collector), and thermal pad layout with 2SD1815S-E, 2SD1815S-H, and 2SD1815T-H. Only h_FE rank (T vs. S) and halogen content differ; no PCB redesign is needed when substituting within the TP-based variants.

What is the typical V_CE(sat) of the 2SD1815T-E under standard test conditions?

The typical V_CE(sat) of the 2SD1815T-E is –150 mV at I_C = –1.5 A and I_B = –0.15 A (IC/IB = 10), per onsemi datasheet No. 2539-2/7. The maximum specified value is –400 mV under the same conditions, ensuring robust saturation across process variation.

Is the 2SD1815T-E compliant with RoHS and halogen-free standards?

Yes-the 2SD1815T-E is Pb-free and complies with the EU RoHS Directive 2011/65/EU. It is not halogen-free; for halogen-free versions, select the 2SD1815T-H variant. This distinction is explicitly stated in the "Ordering Information" table of the official datasheet.

Can the 2SD1815T-E be used in complementary pair configurations with the 2SB1215T-E?

Yes-the 2SD1815T-E (NPN) and 2SB1215T-E (PNP) share matched electrical characteristics including V_CEO, I_C, f_T, and switching times, and are specified together in the same datasheet (No. 2539). Their TP packaging and complementary h_FE ranking enable balanced push-pull and H-bridge designs.

2SD1815T-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 150mA, 1.5A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 70 @ 500mA, 5V

Power - Max:: 1 W

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TP

2SD1815T-E FAQ

1.How can I place an order for 2SD1815T-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1815T-E 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 2SD1815T-E reliable?

The price and inventory of 2SD1815T-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1815T-E is usually 5 days.

3.What payment methods are accepted for 2SD1815T-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1815T-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1815T-E?

2SD1815T-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1815T-E 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 2SD1815T-E?

For technical support, including 2SD1815T-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1815T-E requirements.

6.How does Aetrix verify that 2SD1815T-E is sourced from the original manufacturer or authorized distributors?

All 2SD1815T-E 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 2SD1815T-E meets industry standards.

7.What is the process for return or replacement of 2SD1815T-E?

All 2SD1815T-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1815T-E, 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 2SD1815T-E part is unused and in its original packaging.

Return procedure for 2SD1815T-E:

1.Submit a request within 90 days.

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

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