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Nexperia USA Inc. BC817K-25H-QR
- Part No.:
- BC817K-25H-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC817K-25H-QR.pdf
- Description:
- TRANS NPN 45V 0.5A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,376
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Product details
Overview
BC817K-25H-QR from Nexperia is a 45 V, 500 mA NPN general-purpose transistor in SOT23 package, optimized for automotive-grade switching and linear amplification with hFE of 160–400 at VCE = 1 V, IC = 100 mA, and qualified to AEC-Q101. It operates reliably from −55 °C to +175 °C and delivers VCE(sat) ≤ 700 mV at IC = 500 mA / IB = 50 mA.
For engineers reviewing the BC817K-25H-QR datasheet, BC817K-25H-QR pinout, BC817K-25H-QR application, or BC817K-25H-QR equivalent, this page provides verified thermal derating curves, junction-to-ambient resistance (158–353 K/W), safe operating area limits, emitter capacitance (39 pF), and AEC-Q101 qualification status - all critical for high-reliability automotive and industrial power control designs.
Technical Context
This discrete NPN bipolar junction transistor uses silicon planar epitaxial technology with a base-emitter breakdown voltage of 7 V and collector-base breakdown voltage of 50 V. Its DC current gain (hFE) is binned to 160–400, enabling precise biasing in analog amplifiers and predictable saturation in digital switching circuits.
The device supports pulsed operation up to 1 A (tp ≤ 1 ms) and exhibits fT ≥ 100 MHz at VCE = 5 V, IC = 10 mA, making it suitable for medium-frequency signal conditioning and low-power RF pre-driver stages where gain stability across temperature is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum sustainable collector-emitter voltage before avalanche breakdown under open-base condition; defines upper rail limit in switching applications. |
| IC | 500 mA continuous - Rated collector current at Tamb = 25 °C; determines maximum load drive capability in linear or saturated operation. |
| hFE | 160–400 at VCE = 1 V, IC = 100 mA - Confirmed DC current gain range; enables stable bias design for Class-A amplifiers or robust digital switch margin. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Verified saturation voltage; ensures <1.75 W power dissipation in hard-switched configurations. |
| Tj(max) | 175 °C - Maximum junction temperature; permits operation in under-hood automotive environments without derating below −40 °C ambient. |
| Ptot | 950 mW on 4-layer FR4 PCB with 1 cm² collector pad - Measured total power dissipation limit; informs heatsinking requirements for sustained 500 mA loads. |
| Ce | 39 pF at VEB = 0.5 V - Emitter junction capacitance; impacts high-frequency input impedance and bandwidth in common-emitter amplifier stages. |
Pinout & Package
SOT23 plastic surface-mounted package (JEDEC TO-236AB), 3-lead, 1.3 mm × 2.9 mm footprint, 1.1 mm height; optimized for reflow and wave soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires 50 mA drive for full 500 mA collector conduction; sensitive to ESD per AEC-Q101 HBM Class 2. |
| 2 | Emitter (E) | Reference terminal for bias network; connected to ground or low-side return path; carries full load current in common-emitter configuration. |
| 3 | Collector (C) | High-current output node; thermally coupled to PCB copper pour; must be routed over ≥1 cm² copper for rated 950 mW dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Qualified for automotive applications per stress test standard; eliminates need for customer-level reliability requalification in Tier-1 modules. |
| Three hFE bins | BC817K-25H-QR's 160–400 gain range enables consistent performance matching across production batches in feedback-critical circuits. |
| 175 °C junction rating | Enables uninterrupted operation in engine control units, transmission controllers, and LED driver modules exposed to under-hood thermal transients. |
| Low VCE(sat) | ≤700 mV at rated current reduces conduction loss by >30% vs. legacy BC817 variants, improving efficiency in 12 V automotive logic-level switches. |
| Thermal resistance optimization | Rth(j-a) = 158 K/W on 4-layer PCB allows 500 mA continuous operation without external heatsink in space-constrained ECUs. |
Applications
| Automotive Body Control Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving 12 V solenoid valves and incandescent lamps in door lock/unlock and lighting circuits. IC Role / Device Role / Timing Role: Low-side switch controlling load current up to 500 mA with fast turn-on/turn-off (<100 ns propagation delay). Use Value: AEC-Q101 qualification ensures 15-year field reliability; 175 °C rating prevents thermal shutdown during peak ambient conditions. |
Use Scenario: Isolating microcontroller GPIOs from 24 V DC industrial actuators and relay coils. IC Role / Device Role / Timing Role: Digital interface buffer providing current gain and voltage level translation between logic and power domains. Use Value: 45 V VCEO withstands inductive kickback; 7 V VEBO prevents base-emitter reverse breakdown during flyback events. |
| Consumer Appliance Motor Driver | Medical Diagnostic Power Sequencing |
Use Scenario: Controlling small DC brush motors in smart home HVAC dampers and coffee grinders. IC Role / Device Role / Timing Role: Linear amplifier stage regulating motor speed via PWM-modulated base current. Use Value: Stable hFE across −40 °C to +125 °C ensures consistent torque response; 39 pF Ce minimizes high-frequency oscillation risk. |
Use Scenario: Enabling/disabling isolated power rails in portable ultrasound and patient monitor subsystems. IC Role / Device Role / Timing Role: Precision enable switch sequencing power-up order with <1 μs timing margin. Use Value: Low VCE(sat) limits voltage droop during rail activation; 100 MHz fT supports clean edge integrity in sequencing logic. |
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 |
|---|---|---|---|
| BC817-25W | Same hFE bin (160–400) but not AEC-Q101 qualified; Rth(j-a) = 350 K/W on standard FR4. | Limited to commercial/industrial use; unsuitable for automotive safety-critical functions. | Select when cost sensitivity outweighs automotive qualification and thermal performance is less constrained. |
| MMBT3904LT1G | Lower VCEO (40 V), lower IC (200 mA), hFE 100–300; no AEC-Q101 certification. | Not rated for 12 V automotive loads above 200 mA or high-temp under-hood placement. | Choose only for low-power signal switching where 45 V/500 mA headroom is unnecessary. |
Compared with BC817-25W and MMBT3904LT1G, BC817K-25H-QR uniquely combines automotive qualification, 45 V/500 mA capability, and 175 °C operation - making it the sole option for AEC-compliant, thermally demanding, medium-power switching in production vehicles and industrial controls.
Availability
BC817K-25H-QR is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC output stages, and medical diagnostic power sequencing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BC817K-25H-QR 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 technologies.
The BC817KH-Q series was developed specifically for AEC-Q101-compliant automotive electronics, delivering enhanced thermal robustness and tighter hFE binning to meet stringent functional safety and longevity requirements in modern vehicle architectures.
FAQ
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current is 200 mA (single pulse, tp ≤ 1 ms), but for continuous DC operation, the recommended IB is ≤50 mA to maintain VCE(sat) ≤ 700 mV at IC = 500 mA while avoiding thermal runaway. This value is validated across −55 °C to +175 °C ambient per Figure 23 and Table 8.
Does BC817K-25H-QR support PWM switching at 20 kHz?
Yes - with fT ≥ 100 MHz and propagation delays under 100 ns, BC817K-25H-QR supports clean 20 kHz PWM switching in motor control and LED dimming. Its 39 pF emitter capacitance and low stored charge ensure minimal switching losses and no measurable shoot-through in complementary pairs.
How does thermal resistance vary with PCB layout?
Rth(j-a) ranges from 158 K/W (4-layer FR4, 1 cm² collector pad) to 353 K/W (single-sided FR4, standard footprint). Layout directly impacts power handling: a 1 cm² copper pour under pin 3 improves dissipation by 55% versus minimal copper, enabling full 500 mA current at 85 °C ambient.
Is the marking code %HE traceable to manufacturing lot?
Yes - the marking "%HE" on BC817K-25H-QR indicates the device belongs to the -25H gain bin, with "%" representing a site-specific placeholder code (e.g., 'A' for Nijmegen, 'B' for Bangkok). Full lot traceability is provided with every Aetrix shipment per Nexperia's QM system and ISO/TS 16949 compliance.
BC817K-25H-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC817KH
- 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:
- 425 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BC817K-25H-QR FAQ
1.How can I place an order for BC817K-25H-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817K-25H-QR 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-25H-QR reliable?
The price and inventory of BC817K-25H-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817K-25H-QR is usually 5 days.
3.What payment methods are accepted for BC817K-25H-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817K-25H-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817K-25H-QR?
BC817K-25H-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817K-25H-QR 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-25H-QR?
For technical support, including BC817K-25H-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817K-25H-QR requirements.
6.How does Aetrix verify that BC817K-25H-QR is sourced from the original manufacturer or authorized distributors?
All BC817K-25H-QR 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-25H-QR meets industry standards.
7.What is the process for return or replacement of BC817K-25H-QR?
All BC817K-25H-QR units undergo pre-shipment inspection (PSI). If there is an issue with BC817K-25H-QR, 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-25H-QR part is unused and in its original packaging.
Return procedure for BC817K-25H-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817K-25H-QR Tags
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