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

Diodes Incorporated BC817-40-7-F

Name: BC817-40-7-F
Brand: Diodes Incorporated
SKU: BC817-40-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC817-40-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BC817-40-7-F.pdf

Description:: TRANS NPN 45V 0.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:741,015

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Product details

Overview

BC817-40-7-F from Diodes Incorporated is a 45 V, 500 mA NPN small-signal transistor in SOT23 package, featuring h_FE = 250–600 at I_C = 100 mA and V_CE = 1.0 V, V_CE(SAT) ≤ 0.7 V at I_C = 500 mA/I_B = 50 mA, and f_T = 100 MHz - used for switching and audio-frequency amplification in automotive and industrial control circuits.

For engineers reviewing the BC817-40-7-F datasheet, BC817-40-7-F pinout, BC817-40-7-F application, or BC817-40-7-F equivalent, key selection criteria include DC current gain range, saturation voltage under high-current drive, thermal resistance (R_θJA = 403 °C/W), AEC-Q101 qualification, and SOT23 lead-free compliance.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage. It operates with V_CEO = 45 V, I_C = 500 mA continuous, and supports pulsed base drive up to I_BM = 200 mA - enabling robust switching in relay drivers and logic-level interface stages.

The device is qualified to AEC-Q101, with guaranteed operation from –65 °C to +150 °C and ESD HBM rating of 8 kV. Its SOT23 package delivers compact mounting and automated insertion compatibility while maintaining thermal performance via optimized copper pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration.
I_C (continuous)	500 mA - Continuous collector current handling capacity for sustained switching or amplification.
h_FE range	250–600 - DC current gain at I_C = 100 mA/V_CE = 1 V, enabling predictable base drive sizing.
V_CE(SAT)	≤ 0.7 V at I_C = 500 mA/I_B = 50 mA - Low saturation voltage minimizes power loss in saturated-switch applications.
f_T	100 MHz - Gain-bandwidth product confirming usable frequency response up to AF and low-MHz signal amplification.
R_θJA	403 °C/W - Junction-to-ambient thermal resistance on minimum FR-4 pad, defining power derating limits.
ESD HBM	8,000 V - Human-body-model ESD robustness supporting handling in non-ESD-controlled assembly environments.

Pinout & Package

SOT23 plastic surface-mount package with matte tin-plated leads, UL 94V-0 flammability rating, and moisture sensitivity level 1 per J-STD-020. Weight: 0.008 g.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emission terminal for majority carriers	Reference node for biasing; connects to ground or low-impedance return path in common-emitter switches.
2 (Base)	Control electrode for carrier injection	Receives current-limited drive signal; requires series resistor to limit I_B ≤ 200 mA peak.
3 (Collector)	Current collection terminal	Connects to load or supply rail; carries full switched current and dissipates most heat during conduction.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability across temperature, humidity, and mechanical stress tests.
Lead-free & Halogen-free	Fully RoHS-compliant with <900 ppm Br, <900 ppm Cl, and <1000 ppm Sb - meets global environmental regulations.
Epitaxial planar construction	Ensures tight h_FE distribution and low leakage (I_CES ≤ 100 nA at V_CE = 45 V).
Optimized for automatic insertion	SOT23 footprint and lead geometry support high-yield pick-and-place and reflow soldering.

Applications

Automotive Door Module

Industrial PLC Output Stage

Use Scenario: Driving window lift motors and mirror actuators in 12 V vehicle systems.

IC Role / Device Role / Timing Role: NPN switch controlling motor direction and enable via microcontroller GPIO.

Use Value: Low V_CE(SAT) reduces heat generation during PWM-driven actuation; AEC-Q101 ensures field longevity.

Use Scenario: Isolating and amplifying digital outputs from PLC CPU to 24 V solenoid loads.

IC Role / Device Role / Timing Role: Discrete NPN buffer stage interfacing low-voltage logic to higher-power field devices.

Use Value: High h_FE enables direct drive from 3.3 V/5 V MCU pins without additional gain stages.

Consumer Audio Amplifier

Power Supply Enable Circuit

Use Scenario: Pre-amplifier stage in portable speaker systems with battery-powered Class-AB topology.

IC Role / Device Role / Timing Role: Small-signal voltage amplifier with fixed bias network and emitter degeneration.

Use Value: f_T = 100 MHz supports clean mid-band audio response; low noise figure improves SNR.

Use Scenario: Enabling auxiliary rails (e.g., 3.3 V standby) only when main 5 V supply is stable.

IC Role / Device Role / Timing Role: Active-high enable switch controlled by supervisor IC reset output.

Use Value: Fast turn-on/off and low leakage (<100 nA) prevent unintended power-up or drain during sleep mode.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-25-7-F	Lower h_FE range (160–400) and tighter gain binning	Better suited for precision biasing where gain consistency matters more than maximum drive	Select when circuit stability requires narrower h_FE tolerance and lower saturation voltage variation.
MMBT3904LT1G	Higher V_CEO (40 V vs. 45 V), same SOT23, h_FE = 100–300 at I_C = 10 mA	Widely available but not AEC-Q101 qualified; lower max I_C (200 mA) limits high-current use	Choose for cost-sensitive consumer designs where automotive qualification is unnecessary.

Compared with BC817-25-7-F and MMBT3904LT1G, BC817-40-7-F provides highest DC gain and highest continuous current capability, making it optimal for high-efficiency switching in thermally constrained automotive modules where gain margin and saturation loss directly impact system efficiency.

Availability

BC817-40-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, consumer audio amplifiers, and power supply enable circuits requiring stable component supply and AEC-Q101 assurance.

Supply support for BC817-40-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The BC817 series belongs to Diodes' AEC-Q101-qualified small-signal transistor portfolio, engineered for robust switching and amplification in harsh-environment applications where thermal stability and process consistency are critical.

FAQ

Is BC817-40-7-F suitable for automotive applications?

Yes. BC817-40-7-F is explicitly qualified to AEC-Q101 standards and rated for operation from –65 °C to +150 °C. Its packaging, thermal performance, and electrical parameters meet requirements for under-hood and body-control module use, including door modules and lighting drivers.

What is the maximum safe operating current for continuous DC switching?

The absolute maximum continuous collector current is 500 mA at T_A = +25 °C. Derating applies above 25 °C: power dissipation drops linearly beyond 310 mW, governed by R_θJA = 403 °C/W on standard FR-4 PCB layout.

How does the h_FE binning differ between BC817-16, -25, and -40 variants?

BC817-40 guarantees h_FE = 250–600 at I_C = 100 mA/V_CE = 1 V; BC817-25 is 160–400; BC817-16 is 100–250. All share identical package, voltage ratings, and thermal specs - only DC gain range differs per bin.

Can BC817-40-7-F replace BC847C in existing designs?

No - BC847C has V_CEO = 45 V but only I_C = 100 mA and h_FE = 420–800. While gain overlaps, BC817-40's 500 mA rating allows higher load drive, but its larger saturation voltage at high current may affect timing in fast-switching circuits originally designed for BC847C.

BC817-40-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 100mA, 1V

Power - Max:: 310 mW

Frequency - Transition:: 100MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BC817-40-7-F FAQ

1.How can I place an order for BC817-40-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817-40-7-F 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 BC817-40-7-F reliable?

The price and inventory of BC817-40-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40-7-F is usually 5 days.

3.What payment methods are accepted for BC817-40-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC817-40-7-F?

BC817-40-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817-40-7-F 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 BC817-40-7-F?

For technical support, including BC817-40-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40-7-F requirements.

6.How does Aetrix verify that BC817-40-7-F is sourced from the original manufacturer or authorized distributors?

All BC817-40-7-F 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 BC817-40-7-F meets industry standards.

7.What is the process for return or replacement of BC817-40-7-F?

All BC817-40-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40-7-F, 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 BC817-40-7-F part is unused and in its original packaging.

Return procedure for BC817-40-7-F:

1.Submit a request within 90 days.

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

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