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

onsemi 2SD1835S

Name: 2SD1835S
Brand: onsemi
SKU: 2SD1835S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1835S

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: 2SD1835S.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,682

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Product details

Overview

2SD1835S from onsemi is an NPN bipolar junction transistor (BJT) optimized for medium-power switching applications, featuring 50 V V_CEO, 2 A I_C, 0.15 V typical V_CE(sat) at 1 A/50 mA drive, 150 MHz f_T, and SC-34A (TO-92) package. It serves as a low-saturation switch in relay drivers, lamp drivers, and voltage regulators.

For engineers reviewing the 2SD1835S datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance at 1 A, h_FE rank classification (S-grade: 140–280), fast switching (t_on = 60 ns, t_f = 30 ns), and Pb-free NP package compliance.

Technical Context

This NPN BJT uses FBET and MBIT fabrication processes to achieve low saturation voltage and high current gain consistency across temperature. Its design targets discrete switching nodes where thermal stability up to 150 °C junction temperature and reliable operation under pulsed loads (I_CP = 3 A) are required.

The device operates with fixed bias configurations in linear or saturated mode, supporting base-driven control with V_BE(sat) = 0.9–1.2 V at I_C = 1 A. Its 12 pF Cob and 150 MHz f_T enable use in moderate-speed digital and analog switching up to several megahertz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in switching circuits.
I_C	2 A continuous - Sustained load current capability; supports relay coils and LED arrays without forced cooling.
V_CE(sat)	0.15 V (typ) at I_C = 1 A, I_B = 50 mA - Low conduction loss reduces heat generation in saturated-switch applications.
h_FE (Rank S)	140–280 at V_CE = 2 V, I_C = 100 mA - Guaranteed DC current gain range ensures predictable base drive sizing.
f_T	150 MHz - Enables reliable switching up to ~10–20 MHz with controlled rise/fall times.
t_on/t_f	60 ns / 30 ns - Fast turn-on and fall support PWM dimming and digital logic interfacing.
P_C	0.75 W at T_a = 25 °C - Power dissipation limit determines heatsinking requirements in ambient-constrained layouts.

Pinout & Package

Package: SC-34A (JEDEC TO-92 variant), molded plastic with 0.269 g mass; standardized 3-pin through-hole configuration compliant with JEITA/IEC 60196-1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Connected to ground or low-side return; polarity-sensitive for NPN operation.
2 (Collector)	Current entry path under forward-active/saturation	Drives load (e.g., relay coil, lamp anode); requires voltage margin above V_CEO.
3 (Base)	Control terminal modulating collector current	Driven by TTL/CMOS-compatible logic or resistor-limited source; requires ≥50 mA for full saturation at 1 A.

Key Features

Feature	Design Value
Low V_CE(sat)	0.15 V typ at 1 A enables <150 mW conduction loss, reducing thermal stress in compact PCBs.
High h_FE rank consistency	S-grade binning (140–280) ensures uniform base drive requirements across production lots.
Fast switching	60 ns t_on and 30 ns t_f support 5–10 MHz PWM without significant duty-cycle distortion.
Pb-free NP package	RoHS-compliant SC-34A housing meets industrial environmental standards without lead-based solder concerns.

Applications

Relay Drivers	Lamp Drivers
Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current with TTL-level base input. Use Value: 0.15 V V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at marginal supply voltages.	Use Scenario: Switching incandescent or halogen lamps (up to 24 V/1.5 A) in automotive interior lighting. IC Role / Device Role / Timing Role: Medium-current saturated switch replacing mechanical contacts. Use Value: 2 A I_C rating and 150 °C T_j allow direct mounting on FR-4 without heatsink in intermittent-duty cycles.
Voltage Regulators	Electrical Equipment Control
Use Scenario: Pass transistor in linear 5 V/1 A regulators for embedded microcontroller supplies. IC Role / Device Role / Timing Role: Series pass element operating in active region with feedback-controlled base bias. Use Value: 150 MHz f_T and stable h_FE support loop stability in low-dropout configurations with minimal phase lag.	Use Scenario: Load switching in industrial control panels (e.g., solenoid valves, indicator LEDs). IC Role / Device Role / Timing Role: Discrete power switch interfaced to microcontroller GPIO pins. Use Value: SC-34A through-hole package provides mechanical robustness and hand-solderability for field-replaceable modules.

Relay Drivers

Lamp Drivers

Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules.

IC Role / Device Role / Timing Role: NPN switch controlling relay coil current with TTL-level base input.

Use Value: 0.15 V V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at marginal supply voltages.

Use Scenario: Switching incandescent or halogen lamps (up to 24 V/1.5 A) in automotive interior lighting.

IC Role / Device Role / Timing Role: Medium-current saturated switch replacing mechanical contacts.

Use Value: 2 A I_C rating and 150 °C T_j allow direct mounting on FR-4 without heatsink in intermittent-duty cycles.

Voltage Regulators

Electrical Equipment Control

Use Scenario: Pass transistor in linear 5 V/1 A regulators for embedded microcontroller supplies.

IC Role / Device Role / Timing Role: Series pass element operating in active region with feedback-controlled base bias.

Use Value: 150 MHz f_T and stable h_FE support loop stability in low-dropout configurations with minimal phase lag.

Use Scenario: Load switching in industrial control panels (e.g., solenoid valves, indicator LEDs).

IC Role / Device Role / Timing Role: Discrete power switch interfaced to microcontroller GPIO pins.

Use Value: SC-34A through-hole package provides mechanical robustness and hand-solderability for field-replaceable modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC4184	V_CEO = 50 V, I_C = 1 A, V_CE(sat) = 0.25 V (typ), h_FE = 70–240	Lower current rating and higher saturation voltage reduce efficiency in 1–2 A loads.	Prefer when lower cost and reduced thermal demand justify 1 A limit.
MJD127G	V_CEO = 100 V, I_C = 2 A, V_CE(sat) = 0.5 V (typ), TO-225 package	Higher voltage rating but double V_CE(sat) increases conduction loss; surface-mount only.	Select for >60 V systems or automated assembly; avoid if low-loss 50 V switching is critical.

Compared with 2SD1835S, 2SC4184 offers lower cost but sacrifices 1 A current headroom and 0.1 V saturation advantage, while MJD127G trades off efficiency for voltage margin and SMT compatibility-neither is pin-compatible, requiring layout revision.

Availability

2SD1835S is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and voltage regulators requiring stable component supply, long-term industrial availability, and RoHS-compliant through-hole packaging.

Supply support for 2SD1835S 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The 2SD1835S belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-effective, thermally robust discrete switching in industrial control, power management, and electromechanical interface applications.

FAQ

What is the maximum continuous collector current rating for the 2SD1835S?

The 2SD1835S has a maximum continuous collector current (I_C) rating of 2 A at T_a = 25 °C. Derating applies above 25 °C ambient per the PC–Ta curve; at 75 °C, usable I_C drops to approximately 1.3 A. This rating assumes adequate PCB copper area for heat dissipation and excludes pulse conditions covered by I_CP = 3 A.

Does the 2SD1835S have Pb-free packaging?

Yes, the 2SD1835S is supplied in a Pb-free NP package compliant with RoHS Directive 2011/65/EU. The "S" suffix denotes bag packing with Pb-free finish, and the device carries the marking "D1835" with lot and rank codes. Full compliance documentation is available via onsemi's quality portal.

What is the hFE rank classification for the 2SD1835S?

The 2SD1835S is ranked as "S", corresponding to a guaranteed h_FE range of 140–280 at V_CE = 2 V and I_C = 100 mA. This binning ensures consistent base drive requirements across units, simplifying circuit design versus unranked variants like the base 2SD1835.

Can the 2SD1835S be used in linear amplifier applications?

The 2SD1835S is characterized and optimized for switching operation-not linear amplification. While it exhibits h_FE and f_T values usable in low-frequency analog stages, its SOA curves, thermal resistance, and lack of small-signal linearity specs make it unsuitable for precision amplifiers. Use dedicated small-signal transistors such as 2N5088 for such roles.

What is the pin configuration for the 2SD1835S in the SC-34A package?

The 2SD1835S in SC-34A (TO-92) package has pin 1 = Emitter, pin 2 = Collector, pin 3 = Base when viewed with flat side facing outward and leads pointing down. This matches JEDEC TO-226AA standard and is confirmed in the onsemi outline drawing EN2158B. Incorrect orientation risks reverse-bias damage during operation.

2SD1835S Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

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:: 140 @ 100mA, 2V

Power - Max:: 750 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-NP

2SD1835S FAQ

1.How can I place an order for 2SD1835S through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1835S 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 2SD1835S reliable?

The price and inventory of 2SD1835S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1835S is usually 5 days.

3.What payment methods are accepted for 2SD1835S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1835S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1835S?

2SD1835S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1835S 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 2SD1835S?

For technical support, including 2SD1835S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1835S requirements.

6.How does Aetrix verify that 2SD1835S is sourced from the original manufacturer or authorized distributors?

All 2SD1835S 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 2SD1835S meets industry standards.

7.What is the process for return or replacement of 2SD1835S?

All 2SD1835S units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1835S, 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 2SD1835S part is unused and in its original packaging.

Return procedure for 2SD1835S:

1.Submit a request within 90 days.

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

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