My Inquiry
My Account
Infineon Technologies BC 817-40 B5003
- Part No.:
- BC 817-40 B5003
- Manufacturer:
- Infineon Technologies
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC 817-40 B5003.pdf
- Description:
- TRANS NPN 45V 0.5A PG-SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,463
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC817-40 B5003 from Nexperia is an NPN silicon general-purpose audio-frequency transistor with hFE = 250–630 (IC = 100 mA, VCE = 1 V), VCEO = 45 V, IC = 500 mA, and VCE(sat) ≤ 0.7 V at IC = 500 mA/IB = 50 mA; used in discrete amplifier stages, relay drivers, and level-shifting circuits in industrial control modules.
For engineers reviewing the BC817-40 B5003 datasheet, BC817-40 B5003 pinout, BC817-40 B5003 application, or BC817-40 B5003 equivalent, key selection criteria include DC current gain group (hFE-grp.40), SOT23 package thermal limits (RthJS ≤ 70 K/W), saturation voltage under high-current switching, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This NPN bipolar junction transistor operates in linear amplification and saturated switching modes. Its hFE group 40 guarantees minimum DC current gain of 250 at IC = 100 mA and VCE = 1 V, with typical fT = 170 MHz enabling stable operation up to mid-VHF frequencies.
Designed for surface-mount use in space-constrained PCBs, it features Pb-free RoHS-compliant SOT23 packaging, rated for Tj = 150 °C, and supports pulsed collector currents up to 1000 mA with duty-cycle-dependent derating per RthJS curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum allowable collector-emitter voltage before breakdown in open-base configuration; defines safe operating voltage headroom in 24 V industrial logic interfaces. |
| hFE (min/typ/max) | 250 / 400 / 630 - Confirmed DC current gain range at IC = 100 mA, VCE = 1 V; enables predictable base drive sizing for 500 mA load switching. |
| VCE(sat) | ≤ 0.7 V - Measured at IC = 500 mA, IB = 50 mA; ensures < 350 mW conduction loss in saturated switch mode, critical for thermally limited SOT23 layouts. |
| fT | 170 MHz - Typical transition frequency at IC = 50 mA, VCE = 5 V; supports stable small-signal amplification in audio preamp and oscillator feedback paths. |
| RthJS | ≤ 70 K/W - Junction-to-solder-point thermal resistance (SOT23); allows 500 mW continuous dissipation only when board copper area maintains TS ≤ 115 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress-test requirements including HTOL, temperature cycling, and ESD; suitable for under-hood sensor interface designs. |
Pinout & Package
SOT23 plastic surface-mount package with gull-wing leads; 3-terminal configuration optimized for automated placement and reflow soldering on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Current-controlled input node | Receives forward-biased base current to enable collector conduction; requires series resistor limiting IB to ≤100 mA per absolute max rating. |
| 2 (Emitter) | Reference terminal / current sink | Connected to circuit ground or low-side return path; establishes emitter-base voltage reference for bias stability and gain linearity. |
| 3 (Collector) | Output current source | Delivers amplified or switched load current; must be decoupled from supply rail with local ceramic capacitor to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE group 40 | Guaranteed hFE ≥ 250 ensures robust current amplification with minimal base drive, reducing MCU GPIO loading in digital-output driver applications. |
| Low VCE(sat) | ≤ 0.7 V at 500 mA enables efficient power switching in battery-powered devices where conduction loss directly impacts runtime. |
| AEC-Q101 qualification | Validated for automotive ambient conditions (−40 °C to +150 °C junction), supporting use in engine control units and body electronics without additional qualification effort. |
| SOT23 footprint compatibility | Standardized 3-pin SOT23 outline allows drop-in replacement with BC847, BC848, and MMBT3904 in existing layouts, easing BOM rationalization. |
Applications
| Industrial Relay Driver | Automotive Door Lock Actuator |
|---|---|
|
Use Scenario: Driving 12 V, 200 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: NPN switch providing current gain to translate 3.3 V/20 mA MCU output into 500 mA coil drive with forced β = 10. Use Value: VCE(sat) ≤ 0.7 V minimizes coil voltage drop, ensuring reliable relay pull-in even at low battery voltages down to 9 V. |
Use Scenario: Controlling brushed DC motor in vehicle door lock mechanism with PWM-enabled speed regulation. IC Role / Device Role / Timing Role: Low-side switch modulating motor current at 1–5 kHz; leverages hFE stability across −40 °C to +125 °C ambient. Use Value: AEC-Q101 qualification and 150 °C Tj rating ensure uninterrupted operation during extended parking in hot climates. |
| Audio Signal Amplifier Stage | Power Supply Enable Switch |
|
Use Scenario: Single-transistor common-emitter preamplifier for analog sensor signal conditioning in HVAC control panels. IC Role / Device Role / Timing Role: Linear amplifier biased at IC = 1 mA with VCE = 5 V; utilizes hFE consistency across temperature for stable gain calibration. Use Value: fT = 170 MHz provides >10× bandwidth margin over 20 kHz audio band, eliminating phase distortion in feedback networks. |
Use Scenario: Enabling 5 V auxiliary rail in medical diagnostic equipment via microcontroller-controlled power sequencing. IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling PMOS gate drive; operated in saturation with IB = 10 mA for fast turn-on/turn-off. Use Value: 500 mA IC rating supports peak inrush currents of downstream LDOs and filters without secondary protection components. |
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 |
|---|---|---|---|
| MMBT3904LT1G | hFE = 100–300 (IC = 10 mA), VCEO = 40 V, VCE(sat) = 0.2 V @ IC = 10 mA - lower gain, lower saturation voltage at light loads. | Better suited for low-current digital logic interfacing; less margin for 500 mA switching due to lower IC rating (200 mA). | Select when driving LED indicators or logic-level translators where gain stability at <10 mA is prioritized over high-current capability. |
| BC847B,215 | hFE = 200–450 (IC = 10 mA), VCEO = 45 V, same SOT23 package - tighter hFE spread but lower IC rating (100 mA). | Optimized for small-signal amplification; not rated for sustained 500 mA operation or automotive temperature extremes. | Prefer for audio preamps or sensor buffers where precision gain matching matters more than power handling or AEC-Q101 compliance. |
Compared with MMBT3904LT1G and BC847B,215, BC817-40 B5003 uniquely combines AEC-Q101 qualification, 500 mA continuous collector current, and hFE ≥ 250 at high current - making it the only choice among the three for automotive relay drivers and industrial solenoid controllers requiring both reliability and power capability.
Availability
BC817-40 B5003 is available at Aetrix Electronics and suitable for industrial relay drivers, automotive door lock actuators, and audio signal amplifier stages requiring stable component supply across multi-year production cycles.
Supply support for BC817-40 B5003 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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
BC817-40 B5003 belongs to Nexperia's BC817K series of AEC-Q101-qualified general-purpose transistors, designed specifically for cost-sensitive yet reliability-critical applications in automotive body electronics and industrial control systems.
FAQ
What is the maximum continuous collector current for BC817-40 B5003?
The absolute maximum continuous collector current is 500 mA at TS ≤ 115 °C. This rating assumes proper PCB copper area for heat dissipation; exceeding this current without thermal derating risks junction overheating beyond 150 °C, triggering permanent degradation.
Is BC817-40 B5003 pin-compatible with BC847 series transistors?
Yes - BC817-40 B5003 uses the standard SOT23 package with identical pinout (1=Base, 2=Emitter, 3=Collector) as BC847, BC848, and MMBT3904. However, differences in hFE distribution and IC rating mean functional substitution requires verification of gain and current margins in the target circuit.
Does BC817-40 B5003 support pulsed operation above 500 mA?
Yes - peak collector current is rated at 1000 mA for pulse widths < 300 µs and duty cycle < 2%. The permissible pulse load curve (Figure 7) shows Ptot(max)/Ptot(DC) = 3.5 at tp = 100 µs, enabling short-duration surge handling in motor startup or inductive kick scenarios.
How does the hFE group 40 designation affect circuit design?
hFE-grp.40 guarantees minimum DC current gain of 250 at IC = 100 mA and VCE = 1 V, with typical value 400 and maximum 630. Designers must size base resistors using hFE(min) to ensure saturation under worst-case conditions, especially at elevated temperatures where hFE decreases.
BC 817-40 B5003 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 250 @ 100mA, 1V
- Power - Max:
- 330 mW
- Frequency - Transition:
- 170MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SOT23
BC 817-40 B5003 FAQ
1.How can I place an order for BC 817-40 B5003 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC 817-40 B5003 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 BC 817-40 B5003 reliable?
The price and inventory of BC 817-40 B5003 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC 817-40 B5003 is usually 5 days.
3.What payment methods are accepted for BC 817-40 B5003?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC 817-40 B5003 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC 817-40 B5003?
BC 817-40 B5003 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC 817-40 B5003 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 BC 817-40 B5003?
For technical support, including BC 817-40 B5003 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC 817-40 B5003 requirements.
6.How does Aetrix verify that BC 817-40 B5003 is sourced from the original manufacturer or authorized distributors?
All BC 817-40 B5003 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 BC 817-40 B5003 meets industry standards.
7.What is the process for return or replacement of BC 817-40 B5003?
All BC 817-40 B5003 units undergo pre-shipment inspection (PSI). If there is an issue with BC 817-40 B5003, 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 BC 817-40 B5003 part is unused and in its original packaging.
Return procedure for BC 817-40 B5003:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC 817-40 B5003 Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
