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

Nexperia USA Inc. BC817W,135

Name: BC817W,135
Brand: Nexperia USA Inc.
SKU: BC817W,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC817W,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC817W,135.pdf

Description:: TRANS NPN 45V 0.5A SOT-323

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC817W,135 from Nexperia is a 45 V, 500 mA NPN general-purpose transistor in SOT323 (SC-70) package, designed for low-voltage switching and linear amplification in space-constrained PCBs. It delivers DC current gain (h_FE) of 100–600 at V_CE = 1 V and I_C = 100 mA, supports 1 A peak collector current, and features 700 mV V_CEsat at I_C = 500 mA / I_B = 50 mA - enabling efficient low-side switching in power management blocks.

For engineers reviewing the BC817W,135 datasheet, BC817W,135 pinout, BC817W,135 application, or BC817W,135 equivalent, this device serves as a high-reliability, cost-optimized discrete switch/amplifier where thermal resistance (R_th(j-a) = 625 K/W on standard FR4), compact footprint, and three h_FE variants support design flexibility across consumer, industrial, and automotive-adjacent signal conditioning circuits.

Technical Context

The BC817W,135 operates as a silicon NPN bipolar junction transistor with open-base collector-emitter breakdown voltage rated at 45 V and emitter-base breakdown voltage at 5 V, ensuring robustness against transient overvoltage in 24 V rail interfaces. Its pulsed h_FE specification (tp ≤ 300 μs, duty cycle ≤ 0.02) enables stable gain behavior under short-duration switching loads.

Thermal performance is defined for two mounting conditions: 625 K/W R_th(j-a) on standard FR4 PCB (single-sided copper, tin-plated, standard footprint) and 431 K/W with 1 cm² collector pad - directly informing heatsinking decisions in thermally dense layouts. Junction temperature is rated to 150 °C, supporting operation in extended ambient environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage with base open; defines upper rail compatibility for 3.3 V to 24 V logic-level switching.
I_C	500 mA continuous - Sustained load drive capability for relays, LEDs, and small solenoids without forced cooling.
h_FE	100–600 at V_CE = 1 V, I_C = 100 mA - Wide DC gain range enables predictable biasing across production lots and temperature extremes.
V_CEsat	700 mV max at I_C = 500 mA / I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in saturated-switch applications.
f_T	100 MHz - Transition frequency supports audio-frequency amplification and fast digital switching up to ~10 MHz.
R_th(j-a)	625 K/W on standard FR4 - Thermal resistance baseline used to calculate junction temperature rise under real-world PCB layout conditions.

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: 3-lead, ultra-small outline (2.2 mm × 1.35 mm × 0.95 mm), optimized for high-density routing and reflow-compatible assembly.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires 50 mA base drive for full 500 mA collector conduction - sets minimum driver strength requirement.
2	Emiter (E)	Common reference terminal for NPN configuration; connects to ground or low-side return path in switching topologies.
3	Collector (C)	High-current output node; electrically isolated from PCB ground plane in TO-92 equivalents - enables floating-load configurations.

Key Features

Feature	Design Value
Three h_FE variants	BC817W (100–600), BC817-16W (100–250), BC817-25W (160–400), BC817-40W (250–600) - allows precise gain matching to circuit stability and noise requirements.
Low V_CEsat	700 mV max ensures <1.2 W conduction loss at 500 mA - reduces thermal stress in unheatsinked PCBs.
1 A peak I_C	Single-pulse rating (t_p ≤ 1 ms) supports inrush current handling for capacitive or inductive loads during startup.
SC-70 footprint	0.65 mm pitch, 2.2 mm × 1.35 mm body - enables >2× higher board density vs. SOT23 and eliminates need for through-hole mounting.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU outputs with current limiting via base resistor.

IC Role / Device Role / Timing Role: Low-side NPN switch translating logic-high to LED-on state; operates in saturation with <1 µs turn-on/turn-off delay.

Use Value: Enables direct drive without level-shifting ICs; 700 mV V_CEsat preserves >3.0 V forward voltage margin for red/green/yellow LEDs.

Use Scenario: Amplifying weak sensor signals (e.g., thermistor divider output) before ADC sampling in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage providing 20–50× voltage gain with bandwidth >100 kHz.

Use Value: 100 MHz f_T and 100–600 h_FE ensure stable small-signal gain across temperature; SOT323 saves space in compact sensor modules.

Power Supply Enable Switch

Industrial Input Signal Conditioning

Use Scenario: Enabling/disabling 5 V or 12 V auxiliary rails using MCU-controlled enable lines in programmable power supplies.

IC Role / Device Role / Timing Role: High-side or low-side pass element controlled by enable logic; biased into saturation for minimal dropout.

Use Value: 45 V V_CEO and 500 mA I_C support 24 V system rails; 1 A I_CM accommodates capacitor charging surges at power-up.

Use Scenario: Level-shifting and isolating 24 V PLC digital inputs to 3.3 V microcontroller logic in factory automation panels.

IC Role / Device Role / Timing Role: Discrete optocoupler input stage or direct interface transistor converting industrial voltage levels to safe logic thresholds.

Use Value: 5 V V_EBO and 45 V V_CEO provide margin against ESD transients; SOT323 allows placement adjacent to connector footprints.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847BW,115	Same SOT323 package; lower I_C (100 mA) but higher h_FE (200–450); V_CEO = 45 V unchanged.	Better suited for low-power signal amplification; insufficient for 500 mA switching loads.	Select when gain precision and low base drive are prioritized over current capacity.
MMBT3904LT1G	Same 40 V V_CEO, 200 mA I_C; h_FE = 100–300; SOT23 package (larger than SOT323).	Lower power rating and larger footprint limit use in ultra-dense or high-current designs.	Choose only if legacy SOT23 compatibility or second-source availability is required.

Compared with BC847BW,115 and MMBT3904LT1G, the BC817W,135 uniquely balances 500 mA continuous current, 45 V breakdown, and SOT323 miniaturization - making it the only option among the three capable of driving moderate-power loads while maintaining PCB area efficiency.

Availability

BC817W,135 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, and industrial input signal conditioning requiring stable component supply, consistent parametric performance across manufacturing lots, and long-term obsolescence mitigation.

Supply support for BC817W,135 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions engineered for manufacturability and longevity.

The BC817W series belongs to Nexperia's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, space-constrained applications demanding proven reliability in consumer, industrial, and infrastructure equipment.

FAQ

What is the maximum continuous collector current for BC817W,135?

The BC817W,135 supports 500 mA continuous collector current at T_amb = 25 °C with derating above 25 °C per the power dissipation curve. At 75 °C ambient, usable I_C drops to approximately 350 mA due to 290 mW P_tot limit on 1 cm² collector pad and thermal resistance constraints.

Does BC817W,135 have automotive qualification?

No. Per Nexperia's Rev. 8 data sheet (July 2022), BC817W,135 is explicitly designated as non-automotive qualified. It lacks AEC-Q101 testing and is not warranted for safety-critical or life-support systems. Automotive alternatives include BC817W-Q series variants with documented qualification status.

How does the BC817W variant differ from BC817-16W, BC817-25W, and BC817-40W?

The BC817W has the broadest h_FE range (100–600), while BC817-16W (100–250), BC817-25W (160–400), and BC817-40W (250–600) offer tighter, binned gain groups. All share identical V_CEO, I_C, package, and pinout - enabling drop-in replacement where gain tolerance is relaxed or tightened per circuit needs.

Can BC817W,135 be used in linear amplifier configurations?

Yes. With f_T = 100 MHz, V_BE ≈ 1.2 V at I_C = 500 mA, and stable h_FE down to I_C = 10 mA, the BC817W,135 supports Class-A and Class-AB audio and sensor signal amplification. Designers must ensure proper biasing and thermal management, as P_tot is limited to 290 mW with enhanced pad layout.

BC817W,135 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

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

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 200 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BC817W,135 FAQ

1.How can I place an order for BC817W,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817W,135 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 BC817W,135 reliable?

The price and inventory of BC817W,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817W,135 is usually 5 days.

3.What payment methods are accepted for BC817W,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817W,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC817W,135?

BC817W,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817W,135 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 BC817W,135?

For technical support, including BC817W,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817W,135 requirements.

6.How does Aetrix verify that BC817W,135 is sourced from the original manufacturer or authorized distributors?

All BC817W,135 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 BC817W,135 meets industry standards.

7.What is the process for return or replacement of BC817W,135?

All BC817W,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC817W,135, 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 BC817W,135 part is unused and in its original packaging.

Return procedure for BC817W,135:

1.Submit a request within 90 days.

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

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