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Nexperia USA Inc. BC817K-25R
- Part No.:
- BC817K-25R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC817K-25R.pdf
- Description:
- TRANS NPN 45V 0.5A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
BC817K-25R from Nexperia is a 45 V, 500 mA NPN general-purpose transistor in SOT23 (TO-236AB) package, designed for low-voltage switching and linear amplification in space-constrained PCBs. It delivers hFE = 160–400 at VCE = 1 V, IC = 100 mA; VCE(sat) ≤ 700 mV at IC = 500 mA / IB = 50 mA; and is AEC-Q101 qualified for automotive body electronics.
For engineers reviewing the BC817K-25R datasheet, BC817K-25R pinout, BC817K-25R application, or BC817K-25R equivalent, this page provides verified electrical parameters, thermal derating curves, SOT23 footprint details, and validated automotive-grade alternatives - all aligned with Nexperia's Rev. 2 (2018) product data sheet.
Technical Context
This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with defined DC current gain bins (BC817K-25 = 160–400), enabling predictable biasing in driver stages and logic-level interface circuits. Its 45 V VCEO rating supports 24 V industrial control rails and 12 V automotive subsystems without derating.
Thermal performance is specified across four PCB mounting conditions: Rth(j-a) ranges from 162 K/W (4-layer FR4, 1 cm² collector pad) to 358 K/W (single-sided FR4, standard footprint), directly informing heatsinking requirements in continuous 500 mA operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V supply rail switching with 2× safety margin. |
| IC | 500 mA continuous - Supports relay drivers, LED arrays, and small-signal power switches without forced cooling. |
| hFE | 160–400 at VCE = 1 V, IC = 100 mA - Tight gain bin ensures consistent base drive sizing across production batches. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in high-duty-cycle switching. |
| Ptot | 775 mW on 4-layer FR4 with 1 cm² collector pad - Defines maximum dissipation under optimized board layout. |
| fT | 100 MHz - Sufficient for audio preamplifiers and low-speed digital signal buffering up to ~10 MHz. |
| AEC-Q101 | Qualified - Validated for automotive applications including lighting control, sensor interfaces, and body ECU loads. |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mount package: 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height, tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires 50 mA base drive for full 500 mA collector conduction. |
| 2 | Emitter (E) | Common reference terminal; connects to ground or low-side return path in switch configurations. |
| 3 | Collector (C) | High-current output node; thermally coupled to PCB copper for power dissipation management. |
Key Features
| Feature | Design Value |
|---|---|
| Three hFE bins (16–25–40) | Enables precise base resistor selection per gain requirement, reducing design iteration in production. |
| AEC-Q101 qualification | Validated for automotive temperature range (−40 °C to +150 °C) and mechanical stress, supporting Tier-1 BOMs. |
| Low VCE(sat) | Reduces power loss to ≤350 mW at 500 mA, permitting operation without heatsinks in ambient ≤70 °C. |
| Standard SOT23 footprint | Ensures drop-in compatibility with legacy BC817/BC847 designs and automated placement equipment. |
| FR4 PCB thermal models | Four published Rth(j-a) values enable accurate junction temperature prediction for specific board stack-ups. |
Applications
| Automotive Interior Lighting | Industrial PLC Output Stage |
|---|---|
|
Use Scenario: Driving 12 V incandescent or LED dome lights in vehicle cabin modules. IC Role / Device Role / Timing Role: NPN switch controlling load current via microcontroller GPIO. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime; 45 V rating accommodates load dump transients. |
Use Scenario: Isolating and amplifying 24 V DC output signals in programmable logic controller I/O cards. IC Role / Device Role / Timing Role: Level-shifting and current-boosting stage between FPGA I/O and field-side solenoid drivers. Use Value: 500 mA IC supports direct drive of 24 V/200 mA industrial indicators; SOT23 saves board area in dense I/O modules. |
| Consumer Appliance Motor Control | Medical Diagnostic Sensor Interface |
|
Use Scenario: Controlling small brushed DC motors (e.g., HVAC blower, coffee grinder) in white goods. IC Role / Device Role / Timing Role: Low-side switch in H-bridge half-bridge configuration or single-direction motor driver. Use Value: VCE(sat) ≤ 700 mV limits self-heating during PWM operation; 150 °C Tj max supports sealed enclosure thermal environments. |
Use Scenario: Amplifying weak analog signals from temperature or pressure sensors in portable diagnostic tools. IC Role / Device Role / Timing Role: Common-emitter amplifier stage providing 20–40 dB voltage gain with low noise floor. Use Value: fT = 100 MHz ensures bandwidth beyond sensor signal harmonics; tight hFE bin reduces calibration drift across units. |
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; hFE = 200–450 but lower Ptot (250 mW); no AEC-Q101 qualification. | Not suitable for automotive or continuous 500 mA loads; limited to low-power signal amplification. | Select only for cost-sensitive consumer products where AEC-Q101 and power handling are not required. |
| MMBT3904LT1G | Same SOT23 package; hFE = 100–300; VCEO = 40 V; AEC-Q101 qualified but lower voltage margin. | Marginally adequate for 24 V systems; may require derating under load dump conditions. | Prefer when existing designs use MMBT3904 footprint and 40 V rating suffices for the application. |
Compared with BC817K-25R, BC847BW offers higher gain but lacks automotive qualification and thermal capability, while MMBT3904LT1G matches qualification but sacrifices 5 V of collector-emitter voltage headroom - making BC817K-25R optimal for robust 24 V automotive and industrial switching.
Availability
BC817K-25R is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC outputs, consumer appliance motor drives, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for BC817K-25R 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BC817K series belongs to Nexperia's general-purpose transistor portfolio, engineered for robustness in automotive body electronics and industrial control where AEC-Q101 compliance, thermal stability, and gain consistency are critical.
FAQ
What is the maximum allowable junction temperature for BC817K-25R?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in Table 6 of the Nexperia datasheet. Operation above this limit risks permanent degradation of hFE and increased leakage currents. Thermal design must ensure Tj remains below 150 °C under worst-case ambient and power dissipation conditions, using the appropriate Rth(j-a) value for the actual PCB construction.
Is BC817K-25R pin-compatible with BC817-25?
Yes - BC817K-25R uses the identical SOT23 (TO-236AB) package and pinout (1 = Base, 2 = Emitter, 3 = Collector) as BC817-25. The 'K' suffix denotes AEC-Q101 qualification and tighter hFE binning (160–400 vs. 100–250 for BC817-16), but mechanical and electrical pin mapping is fully interchangeable.
What is the typical transition frequency (fT) and how does it affect circuit design?
The typical fT is 100 MHz at VCE = 5 V, IC = 10 mA, f = 100 MHz. This defines the frequency at which current gain drops to unity, limiting usable bandwidth in amplifier configurations. For switching applications, fT > 10× operating frequency ensures minimal gain roll-off during edge transitions - supporting clean 1–5 MHz PWM drive without added phase lag.
How does the power derating curve impact thermal design at elevated ambient temperatures?
Figure 1 shows linear derating: Ptot decreases from 775 mW at 25 °C to 0 mW at 150 °C ambient. At 85 °C ambient, maximum dissipation is ~450 mW on a 4-layer FR4 board. Designers must calculate actual power (IC × VCE(sat)) and compare against the derated limit, adjusting base drive or heatsinking if exceeded to prevent thermal runaway.
BC817K-25R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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 (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 100mA, 1V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BC817K-25R FAQ
1.How can I place an order for BC817K-25R through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817K-25R 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 BC817K-25R reliable?
The price and inventory of BC817K-25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817K-25R is usually 5 days.
3.What payment methods are accepted for BC817K-25R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817K-25R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817K-25R?
BC817K-25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817K-25R 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 BC817K-25R?
For technical support, including BC817K-25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817K-25R requirements.
6.How does Aetrix verify that BC817K-25R is sourced from the original manufacturer or authorized distributors?
All BC817K-25R 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 BC817K-25R meets industry standards.
7.What is the process for return or replacement of BC817K-25R?
All BC817K-25R units undergo pre-shipment inspection (PSI). If there is an issue with BC817K-25R, 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 BC817K-25R part is unused and in its original packaging.
Return procedure for BC817K-25R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817K-25R 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
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