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Nexperia USA Inc. BC817-25W,135
- Part No.:
- BC817-25W,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC817-25W,135.pdf
- Description:
- TRANS NPN 45V 0.5A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:26,910
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Product details
Overview
BC817-25W,135 from Nexperia is an NPN general-purpose transistor in SOT323 (SC-70) package, rated for 45 V VCEO, 500 mA continuous collector current, and DC current gain (hFE) of 160–400 at VCE = 1 V and IC = 100 mA. It serves as a low-voltage switching and amplification device in compact power management and signal interface circuits.
For engineers reviewing the BC817-25W,135 datasheet, BC817-25W,135 pinout, BC817-25W,135 application, or BC817-25W,135 equivalent, this page delivers verified electrical parameters, thermal derating behavior, base-emitter saturation voltage (VBE(sat) ≤ 1.2 V), collector-emitter saturation voltage (VCE(sat) ≤ 700 mV), and SOT323 footprint compatibility for high-density PCB layouts.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching modes with pulsed base drive capability up to 200 mA peak. Its hFE range (160–400) enables predictable current amplification across industrial temperature ranges (−65 °C to 150 °C).
Thermal resistance Rth(j-a) is 625 K/W on standard FR4 PCB and improves to 431 K/W with a 1 cm² collector pad-directly supporting thermal design decisions for sustained 500 mA operation under ambient constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown; defines rail voltage headroom in switching applications. |
| IC | 500 mA - Continuous DC collector current rating; sets maximum load drive capability without forced cooling. |
| hFE | 160–400 - Confirmed DC current gain at VCE = 1 V, IC = 100 mA; enables precise base resistor sizing for reliable saturation. |
| VCE(sat) | ≤ 700 mV - Measured at IC = 500 mA, IB = 50 mA; ensures low conduction loss in on-state switching. |
| VBE(sat) | ≤ 1.2 V - Base-emitter voltage under same conditions; determines minimum driver voltage requirement. |
| fT | 100 MHz - Transition frequency at VCE = 5 V, IC = 10 mA; supports audio-frequency and low-speed digital signal amplification. |
| Ptot | 290 mW - Max power dissipation with 1 cm² collector pad; defines thermal margin for continuous operation. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H); standard footprint per Figure 17 (reflow soldering).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal accepting current-limited input to bias the transistor into active or saturated region. |
| 2 | Emiter (E) | Current return path; connected to ground or low-side reference in common-emitter configurations. |
| 3 | Collector (C) | High-current output node; routes switched load current through external pull-up or supply rail. |
Key Features
| Feature | Design Value |
|---|---|
| Three hFE selections | BC817-25W offers 160–400 hFE, enabling consistent gain matching across production batches for stable amplifier biasing. |
| Low VCE(sat) | ≤ 700 mV at full 500 mA load ensures <1.8% voltage drop across transistor in 3.3 V logic-level switching applications. |
| Small-outline packaging | SOT323 footprint occupies only 2.97 mm² board area-critical for space-constrained IoT sensor nodes and wearables. |
| Thermal robustness | Junction temperature rating up to 150 °C supports operation in sealed enclosures or near heat-generating components. |
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: NPN switch controlling LED anode connection to VCC; operates in saturation mode with <1 µs turn-on delay. Use Value: VCE(sat) ≤ 700 mV preserves >90% forward voltage for LED brightness consistency across temperature. |
Use Scenario: Amplifying weak analog sensor signals (e.g., thermistor divider) before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias network; bandwidth limited to <100 kHz by fT. Use Value: hFE range of 160–400 allows predictable gain calibration without trimming resistors. |
| Power Rail Switch | Level Translation Interface |
Use Scenario: Enabling/disabling 5 V peripheral power rails using 1.8 V or 3.3 V logic control signals. IC Role / Device Role / Timing Role: Low-side switch connecting peripheral ground return; driven by MCU GPIO with 10 kΩ base resistor. Use Value: ICM = 1 A peak handles inrush currents during hot-plug events without latch-up. |
Use Scenario: Converting 1.8 V logic outputs to 5 V-compatible signals for legacy peripherals. IC Role / Device Role / Timing Role: Emitter-follower configured for level shifting; base driven by 1.8 V source, emitter outputs ~1.1 V below VCC. Use Value: VBE ≈ 0.7 V at room temperature enables accurate offset prediction for deterministic translation thresholds. |
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 |
|---|---|---|---|
| BC817-25LT1G | Same hFE (160–400), but SOT23 package (larger footprint, 3.05 mm × 1.4 mm); Rth(j-a) = 400 K/W on FR4. | Less suitable for ultra-dense layouts; better thermal performance with standard PCB copper. | Select when board assembly uses legacy SOT23 tooling or requires higher power handling margin. |
| MMBT3904LT1G | Lower VCEO (40 V), lower hFE (100–300), same SOT23; VCE(sat) = 300 mV @ IC/IB = 10. | Optimized for low-saturation digital switching, not linear amplification. | Prefer for 3.3 V/5 V logic-level switching where gain tolerance is less critical than minimal VCE(sat). |
Compared with BC817-25W,135, BC817-25LT1G trades miniaturization for thermal headroom, while MMBT3904LT1G sacrifices voltage rating and gain range to achieve lower saturation loss-making each optimal for distinct layout, thermal, or functional priorities.
Availability
BC817-25W,135 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, power rail switching, and level translation interfaces requiring stable component supply across consumer, industrial, and automotive-adjacent designs.
Supply support for BC817-25W,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 discrete and logic devices, with leadership in automotive-grade and industrial-standard components.
The BC817W series targets cost-sensitive, space-constrained applications needing robust general-purpose NPN transistors-designed for manufacturability, thermal resilience, and consistent parametric performance across temperature and production lots.
FAQ
What is the maximum allowable base current for BC817-25W,135?
The absolute maximum peak base current is 200 mA per the datasheet's limiting values table. For continuous operation, base current must be sized to maintain IC ≤ 500 mA while ensuring VCE(sat) remains ≤ 700 mV-typically achieved with IB ≥ 50 mA at full load, yielding a minimum hFE-based safety margin of 10.
Does BC817-25W,135 support automotive applications?
No. Per Nexperia's revision history (Rev. 8, July 2022), the BC817W series was explicitly changed to non-automotive qualification. Automotive use requires the -Q qualified variants (e.g., BC817-25W-Q), which undergo additional AEC-Q101 stress testing and have separate part numbering and traceability.
How does thermal performance change with PCB copper area?
Rth(j-a) improves from 625 K/W (standard SOT323 footprint) to 431 K/W when the collector pad is expanded to 1 cm² on FR4. This 31% reduction directly increases allowable continuous power dissipation from 200 mW to 290 mW at Tamb = 25 °C-enabling higher IC in thermally constrained environments.
Can BC817-25W,135 replace BC817-16W in existing designs?
Yes, with verification. BC817-25W has higher minimum hFE (160 vs. 100), resulting in stronger current amplification at low IC. This may reduce required base drive but could cause over-saturation or slower turn-off in marginal bias networks-confirm stability under worst-case hFE and temperature extremes before substitution.
BC817-25W,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:
- 160 @ 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
BC817-25W,135 FAQ
1.How can I place an order for BC817-25W,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-25W,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 BC817-25W,135 reliable?
The price and inventory of BC817-25W,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-25W,135 is usually 5 days.
3.What payment methods are accepted for BC817-25W,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-25W,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-25W,135?
BC817-25W,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-25W,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 BC817-25W,135?
For technical support, including BC817-25W,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-25W,135 requirements.
6.How does Aetrix verify that BC817-25W,135 is sourced from the original manufacturer or authorized distributors?
All BC817-25W,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 BC817-25W,135 meets industry standards.
7.What is the process for return or replacement of BC817-25W,135?
All BC817-25W,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC817-25W,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 BC817-25W,135 part is unused and in its original packaging.
Return procedure for BC817-25W,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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