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

onsemi 2SD1207S-AE

Name: 2SD1207S-AE
Brand: onsemi
SKU: 2SD1207S-AE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1207S-AE

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: 2SD1207S-AE.pdf

Description:: TRANS NPN 50V 2A 3-MP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SD1207S-AE from onsemi is a low-saturation-voltage NPN bipolar junction transistor rated for 50 V V_CEO, 2 A continuous collector current, and 1 W power dissipation in the MP (SC-51/TO-92) package; it features h_FE = 140–280 at I_C = 100 mA and V_CE = 2 V, and is used in automotive wiring, relay drivers, and lamp drivers.

For engineers reviewing the 2SD1207S-AE datasheet, pinout, applications, or equivalent options, key selection considerations include V_CE(sat) ≤ 0.4 V at I_C = 1 A / I_B = 50 mA, wide SOA, FBET/MBIT process, and TO-92-compatible footprint with JEDEC TO-226AE registration.

Technical Context

This NPN transistor employs FBET (Flat Base Epitaxial Transistor) and MBIT (Multi-Base Integrated Technology) processing to achieve low V_CE(sat) and stable h_FE across current range. It supports DC switching and linear amplification with f_T = 150 MHz and Cob = 12 pF at V_CB = 10 V.

Rated for operation up to T_j = 150 °C and storage from –55 °C to +150 °C, the device delivers large current capacity (I_C = 2 A, I_CP = 4 A pulse) within its 1 W thermal limit, enabled by optimized thermal resistance in the MP package.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage under open-base conditions; defines upper rail limit in switch applications.
I_C	2 A - Continuous DC collector current rating; supports robust load driving without forced cooling in TO-92 form factor.
V_CE(sat)	0.15–0.4 V @ I_C=1 A, I_B=50 mA - Low saturation voltage minimizes conduction loss and self-heating in saturated-switch mode.
h_FE	140–280 @ V_CE=2 V, I_C=100 mA - Guaranteed DC current gain range enables predictable base drive sizing for reliable turn-on.
f_T	150 MHz - Transition frequency confirms usable bandwidth for medium-speed switching (e.g., <500 kHz PWM).
SOA	Wide Safe Operating Area - Supports high peak-current pulses (I_CP = 4 A) without secondary breakdown, critical for inductive load switching.

Pinout & Package

Package: MP (JEITA SC-51 / JEDEC TO-226AE / industry-standard TO-92 variant), epoxy-molded, through-hole, 3-pin, 0.578 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to ground or low-side return path in common-emitter switches.
2	Collector	Current entry terminal; tied to load and supply rail; requires heatsinking consideration at >1 A continuous.
3	Base	Control input; driven with ≥50 mA base current to ensure full saturation at 1 A collector load.

Key Features

Feature	Design Value
FBET/MBIT process	Enables tight h_FE distribution and low, repeatable V_CE(sat) across production lots.
Low V_CE(sat)	Reduces power loss to ≤0.4 W at 1 A, easing thermal design in confined TO-92 layouts.
Wide SOA	Permits safe switching of inductive loads (e.g., relays, lamps) with minimal snubber requirements.
Graded h_FE (Rank S)	Guaranteed 140–280 gain window simplifies base resistor selection and improves batch consistency.

Applications

Automotive Wiring	Relay Drivers
Use Scenario: Controlling door lock actuators, interior lighting, or signal lamps in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: NPN switch providing low-loss, high-current path between battery rail and load. Use Value: V_CE(sat) ≤ 0.4 V ensures <0.4 W conduction loss at 1 A, minimizing heat buildup in sealed harness connectors.	Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial control panels and HVAC systems. IC Role / Device Role / Timing Role: High-current saturated switch enabling fast relay coil energization/de-energization. Use Value: Wide SOA and 4 A pulse rating tolerate relay coil back-EMF spikes without derating or protection diodes.
Lamp Drivers	Linear Power Supplies
Use Scenario: Switching incandescent or halogen lamps (e.g., dashboard backlighting, indicator bulbs) in embedded instrumentation. IC Role / Device Role / Timing Role: Constant-current or on/off switch regulating lamp brightness or state via base-controlled saturation. Use Value: Stable h_FE and low V_CE(sat) maintain consistent lamp voltage drop across temperature and unit variance.	Use Scenario: Pass transistor or series regulator element in low-power linear power supplies (<1 W output). IC Role / Device Role / Timing Role: Adjustable current source or voltage-controlled dissipative element in feedback-regulated topology. Use Value: 150 MHz f_T and low Cob support stable loop response in analog regulation circuits up to ~100 kHz.

Automotive Wiring

Relay Drivers

Use Scenario: Controlling door lock actuators, interior lighting, or signal lamps in 12 V vehicle electrical systems.

IC Role / Device Role / Timing Role: NPN switch providing low-loss, high-current path between battery rail and load.

Use Value: V_CE(sat) ≤ 0.4 V ensures <0.4 W conduction loss at 1 A, minimizing heat buildup in sealed harness connectors.

Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial control panels and HVAC systems.

IC Role / Device Role / Timing Role: High-current saturated switch enabling fast relay coil energization/de-energization.

Use Value: Wide SOA and 4 A pulse rating tolerate relay coil back-EMF spikes without derating or protection diodes.

Lamp Drivers

Linear Power Supplies

Use Scenario: Switching incandescent or halogen lamps (e.g., dashboard backlighting, indicator bulbs) in embedded instrumentation.

IC Role / Device Role / Timing Role: Constant-current or on/off switch regulating lamp brightness or state via base-controlled saturation.

Use Value: Stable h_FE and low V_CE(sat) maintain consistent lamp voltage drop across temperature and unit variance.

Use Scenario: Pass transistor or series regulator element in low-power linear power supplies (<1 W output).

IC Role / Device Role / Timing Role: Adjustable current source or voltage-controlled dissipative element in feedback-regulated topology.

Use Value: 150 MHz f_T and low Cob support stable loop response in analog regulation circuits up to ~100 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1207T-AE	Higher h_FE range (200–400) at I_C = 100 mA; otherwise identical ratings and package.	Preferred where lower base drive current is required; same SOA, V_CE(sat), and thermal limits.	Select 2SD1207T-AE when designing for minimal base current or tighter gain tolerance in feedback-coupled stages.
MJD127G	TO-220 package, higher P_D = 1.5 W, V_CEO = 60 V, h_FE = 1000 min @ I_C = 1 A; not pin-compatible.	Suitable for higher-power or surface-mount alternatives requiring >1 W dissipation or improved thermal performance.	Choose MJD127G only if board layout allows TO-220 footprint and thermal management supports >1 W continuous operation.

Compared with 2SD1207S-AE, the 2SD1207T-AE offers higher gain for reduced base drive burden while maintaining identical saturation and SOA behavior; MJD127G trades TO-92 convenience for higher power handling and different mounting-neither is pin-compatible, but both serve overlapping functional roles in discrete switching designs.

Availability

2SD1207S-AE is available at Aetrix Electronics and suitable for automotive wiring, relay drivers, and lamp drivers requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for 2SD1207S-AE 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 electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The 2SD1207S-AE belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability discrete switching in automotive and industrial control systems.

FAQ

What is the maximum continuous collector current rating for the 2SD1207S-AE?

The 2SD1207S-AE has a maximum continuous collector current (I_C) rating of 2 A at T_a = 25 °C. This rating assumes adequate PCB copper area or minimal heatsinking; derating is required above ambient temperatures of 25 °C per the device's thermal resistance curve. The 2SD1207S-AE maintains safe operation up to its 150 °C junction temperature limit when properly applied.

Is the 2SD1207S-AE pin-compatible with standard TO-92 packages?

Yes-the 2SD1207S-AE uses the MP package, which conforms to JEDEC TO-226AE and JEITA SC-51 outlines, making it mechanically and pinout-compatible with industry-standard TO-92 footprints. Pin 1 is Emitter, Pin 2 is Collector, and Pin 3 is Base-matching conventional TO-92 orientation. The 2SD1207S-AE can be mounted using standard TO-92 tooling and reflow/reflow-soldering profiles.

What does the "S" suffix indicate in 2SD1207S-AE?

The "S" suffix denotes the h_FE gain rank: 2SD1207S-AE is binned to 140–280 at V_CE = 2 V and I_C = 100 mA. This distinguishes it from the "T" grade (200–400), enabling precise base resistor selection. The "-AE" suffix indicates lead-free (Pb-free) finish and tape-and-reel–compatible box packaging (1,000 pcs/box). The 2SD1207S-AE meets RoHS Directive 2011/65/EU.

Can the 2SD1207S-AE be used in linear amplifier configurations?

Yes-the 2SD1207S-AE supports linear operation with f_T = 150 MHz and Cob = 12 pF, enabling use in low-to-medium-frequency analog amplifiers and active regulators. However, its primary design intent is saturated switching; for precision linear applications, consult the full h_FE vs. I_C and V_CE curves in the 2SD1207S-AE datasheet to confirm gain stability and distortion performance at target bias points.

What is the typical V_CE(sat) of the 2SD1207S-AE under standard test conditions?

The typical V_CE(sat) of the 2SD1207S-AE is 0.15 V at I_C = 1 A and I_B = 50 mA, with a maximum specification of 0.4 V under those same conditions. This low saturation voltage directly reduces conduction losses and thermal stress, making the 2SD1207S-AE especially effective in high-duty-cycle switching applications like lamp and relay control.

2SD1207S-AE Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 50mA, 1A

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

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

Power - Max:: 1 W

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-MP

2SD1207S-AE FAQ

1.How can I place an order for 2SD1207S-AE through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1207S-AE 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 2SD1207S-AE reliable?

The price and inventory of 2SD1207S-AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1207S-AE is usually 5 days.

3.What payment methods are accepted for 2SD1207S-AE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1207S-AE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1207S-AE?

2SD1207S-AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1207S-AE 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 2SD1207S-AE?

For technical support, including 2SD1207S-AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1207S-AE requirements.

6.How does Aetrix verify that 2SD1207S-AE is sourced from the original manufacturer or authorized distributors?

All 2SD1207S-AE 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 2SD1207S-AE meets industry standards.

7.What is the process for return or replacement of 2SD1207S-AE?

All 2SD1207S-AE units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1207S-AE, 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 2SD1207S-AE part is unused and in its original packaging.

Return procedure for 2SD1207S-AE:

1.Submit a request within 90 days.

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

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