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

onsemi 2SD1835S-AA

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

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Part No.:: 2SD1835S-AA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SD1835S-AA.pdf

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

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Product details

Overview

2SD1835S-AA from onsemi is an NPN bipolar junction transistor (BJT) designed for medium-power switching applications, featuring V_CEO = 50 V, I_C = 2 A, V_CE(sat) = 0.15–0.4 V at I_C = 1 A / I_B = 50 mA, f_T = 150 MHz, 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-AA datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance under 1 A load, h_FE rank classification (S-grade: 140–280 at 100 mA), switching time (t_on/t_f = 60/30 ns), thermal limits (T_j = 150 °C), and JEDEC-compliant TO-92 mechanical footprint.

Technical Context

This NPN BJT employs FBET and MBIT fabrication processes to achieve low saturation voltage and high current gain consistency across production lots. Its 150 MHz f_T supports fast switching in DC-DC control and pulse-driven loads, while the 0.75 W power dissipation rating requires careful thermal design in continuous conduction mode.

The device operates within a validated ambient range of –55 °C to +150 °C and exhibits tight h_FE binning (Rank S: 140–280 at V_CE = 2 V, I_C = 100 mA), enabling predictable biasing in linear and saturated switching configurations without external gain compensation.

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 DC collector current rating; determines maximum load drive capability in steady-state operation.
V_CE(sat)	0.15–0.4 V @ I_C=1 A/I_B=50 mA - Low saturation voltage minimizes conduction loss and heat generation in on-state switching.
f_T	150 MHz - Gain-bandwidth product enabling reliable operation up to ~10–20 MHz switching frequencies with adequate gain margin.
h_FE (Rank S)	140–280 @ V_CE=2 V, I_C=100 mA - Tight DC current gain bin ensures consistent base drive requirements across units.
t_on/t_f	60 ns / 30 ns - Fast turn-on and fall times reduce switching transition losses in PWM and digital interface applications.
P_C	0.75 W @ T_A=25 °C - Power dissipation limit requiring heatsinking or derating above ambient temperatures.

Pinout & Package

2SD1835S-AA is housed in the SC-34A package (JEDEC TO-92, TO-226AA, SOT-54), a through-hole plastic case with 3 leads and 0.269 g mass. Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - confirmed by official outline drawing EN2158B and electrical connection diagram.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for base-emitter bias; connects to ground or low-side return path in common-emitter switches.
2 (Collector)	Current source terminal	Connects to load and supply rail; carries full switched current; requires trace width and layout consideration for 2 A DC.
3 (Base)	Control input	Receives current-limited drive signal; requires I_B ≥ I_C/h_FE(min) ≈ 7 mA for full saturation at 1 A load.

Key Features

Feature	Design Value
Low V_CE(sat)	0.15 V typical at 1 A enables <150 mW conduction loss per transistor, reducing thermal stress in dense PCB layouts.
High-speed switching	60 ns t_on and 30 ns t_f support >1 MHz PWM operation with minimal overlap loss in motor or LED drivers.
Rank-S h_FE binning	Guaranteed 140–280 h_FE at 100 mA allows precise base resistor selection without margining for gain spread.
FBET/MBIT process	Enables stable parametric performance over temperature and lifetime, critical for industrial relay and lamp driver reliability.

Applications

Relay Driver Circuit	Lamp Driver Module
Use Scenario: Driving electromagnetic relays in PLC output modules where coil voltages range from 5 V to 24 V DC. IC Role / Device Role / Timing Role: NPN switch providing low-impedance path between coil and ground during activation; operates in saturation region. Use Value: V_CE(sat) ≤ 0.4 V ensures >95% coil voltage delivery and eliminates need for snubber diodes in many cases due to controlled turn-off.	Use Scenario: Controlling incandescent or halogen lamps in building automation systems with dimming via PWM. IC Role / Device Role / Timing Role: Medium-current switch modulating lamp current at 100–1000 Hz; handles peak currents up to 2 A during cold filament inrush. Use Value: 2 A I_C rating and 150 MHz f_T allow clean PWM edges without shoot-through risk in multi-transistor arrays.
Voltage Regulator Pass Element	Industrial Equipment Interface
Use Scenario: Serving as series pass transistor in linear voltage regulators delivering up to 1.5 A at 5–12 V output. IC Role / Device Role / Timing Role: Linear-mode current amplifier controlling output voltage via feedback loop; biased in active region. Use Value: Rank-S h_FE consistency reduces output voltage drift across units; 150 °C T_j rating supports operation in enclosed enclosures.	Use Scenario: Level-shifting and isolation in sensor interface boards connecting microcontrollers to 12–24 V field devices. IC Role / Device Role / Timing Role: Digital buffer and level translator converting 3.3 V/5 V logic to 12–24 V open-collector outputs. Use Value: Low V_BE(sat) (0.9–1.2 V) ensures reliable turn-on with standard MCU GPIO drive; TO-92 footprint simplifies manual repair and prototyping.

Relay Driver Circuit

Lamp Driver Module

Use Scenario: Driving electromagnetic relays in PLC output modules where coil voltages range from 5 V to 24 V DC.

IC Role / Device Role / Timing Role: NPN switch providing low-impedance path between coil and ground during activation; operates in saturation region.

Use Value: V_CE(sat) ≤ 0.4 V ensures >95% coil voltage delivery and eliminates need for snubber diodes in many cases due to controlled turn-off.

Use Scenario: Controlling incandescent or halogen lamps in building automation systems with dimming via PWM.

IC Role / Device Role / Timing Role: Medium-current switch modulating lamp current at 100–1000 Hz; handles peak currents up to 2 A during cold filament inrush.

Use Value: 2 A I_C rating and 150 MHz f_T allow clean PWM edges without shoot-through risk in multi-transistor arrays.

Voltage Regulator Pass Element

Industrial Equipment Interface

Use Scenario: Serving as series pass transistor in linear voltage regulators delivering up to 1.5 A at 5–12 V output.

IC Role / Device Role / Timing Role: Linear-mode current amplifier controlling output voltage via feedback loop; biased in active region.

Use Value: Rank-S h_FE consistency reduces output voltage drift across units; 150 °C T_j rating supports operation in enclosed enclosures.

Use Scenario: Level-shifting and isolation in sensor interface boards connecting microcontrollers to 12–24 V field devices.

IC Role / Device Role / Timing Role: Digital buffer and level translator converting 3.3 V/5 V logic to 12–24 V open-collector outputs.

Use Value: Low V_BE(sat) (0.9–1.2 V) ensures reliable turn-on with standard MCU GPIO drive; TO-92 footprint simplifies manual repair and prototyping.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1835T-AA	Same die, Rank T h_FE (200–400 at 100 mA); identical V_CEO, I_C, V_CE(sat), and package.	Higher h_FE reduces required base drive current but increases sensitivity to thermal runaway in linear use.	Select 2SD1835T-AA when lower base current or tighter gain tolerance is needed; verify stability in linear regulator designs.
MJD127G	TO-220 package, higher P_C (1.5 W), same V_CEO (50 V), I_C (2 A), but slower t_f (100 ns) and no h_FE binning.	Suitable for higher-power, heatsink-mounted applications; not drop-in compatible due to different footprint and thermal profile.	Choose MJD127G only when board space allows TO-220 and thermal management includes heatsinking; not a PCB-replaceable alternative.

Compared with 2SD1835T-AA and MJD127G, the 2SD1835S-AA offers optimal balance of guaranteed mid-range h_FE, TO-92 manufacturability, and low-loss switching-making it preferred for cost-sensitive, space-constrained relay and lamp driver PCBs where consistent base drive and thermal simplicity are prioritized.

Availability

2SD1835S-AA is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and voltage regulators requiring stable component supply, long-term obsolescence planning, and RoHS-compliant packaging.

Supply support for 2SD1835S-AA 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 innovation for automotive, industrial, cloud, and IoT applications.

The 2SD1835S-AA belongs to onsemi's general-purpose bipolar transistor product line, engineered specifically for robust, low-cost switching in industrial controls, power supplies, and electromechanical interface circuits.

FAQ

What is the package type and lead configuration of the 2SD1835S-AA?

The 2SD1835S-AA uses the SC-34A package, which is identical to JEDEC TO-92, TO-226AA, and SOT-54. It has three leads arranged as Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base, with a 0.269 g mass and standardized through-hole mounting dimensions per outline drawing EN2158B.

What does the "S" suffix in 2SD1835S-AA indicate?

The "S" in 2SD1835S-AA denotes the h_FE Rank S bin, specifying a DC current gain range of 140–280 measured at V_CE = 2 V and I_C = 100 mA. This binning ensures predictable base drive requirements and consistent performance across production lots of the 2SD1835S-AA.

Can the 2SD1835S-AA replace the 2SD1835T-AA in existing designs?

Yes, the 2SD1835S-AA and 2SD1835T-AA share identical absolute maximum ratings, electrical characteristics, and package. The only difference is h_FE binning (S: 140–280 vs. T: 200–400). Substitution is electrically valid, but verify base resistor values and thermal stability in linear applications where higher h_FE may affect bias point.

What is the maximum continuous collector current for the 2SD1835S-AA?

The 2SD1835S-AA is rated for a continuous collector current (I_C) of 2 A at T_A = 25 °C. Derating is required above ambient temperature - for example, at 75 °C ambient, the usable I_C drops to approximately 1.3 A based on the published P_C–T_A curve in the datasheet.

Is the 2SD1835S-AA RoHS compliant and lead-free?

Yes, the 2SD1835S-AA is RoHS compliant and lead-free, as confirmed by the "Pb Free" marking in the ordering information section and compliance documentation referenced in the onsemi datasheet (Ordering Number EN2158B, September 2013).

2SD1835S-AA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) 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:: 750 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-NP

2SD1835S-AA FAQ

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

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

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

3.What payment methods are accepted for 2SD1835S-AA?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1835S-AA?

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

Once your 2SD1835S-AA 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-AA?

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

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

All 2SD1835S-AA 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-AA meets industry standards.

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

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

Return procedure for 2SD1835S-AA:

1.Submit a request within 90 days.

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

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