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Nexperia USA Inc. BF820W,115
- Part No.:
- BF820W,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BF820W,115.pdf
- Description:
- TRANS NPN 300V 0.05A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:1,770
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Product details
Overview
BF820W from Nexperia is an NPN high-voltage transistor in SOT323 (SC-70) package, rated for 300 V VCBO/VCEO, 50 mA continuous collector current, and 200 mW power dissipation at 25 °C ambient. It delivers 60 MHz transition frequency and 1.6 pF feedback capacitance, targeting high-voltage signal switching in telephony line interface circuits.
For engineers reviewing the BF820W datasheet, BF820W pinout, BF820W application, or BF820W equivalent, key selection criteria include verified 300 V breakdown rating, low 1.6 pF Cre for stable RF performance, SOT323 thermal resistance of 625 K/W, and DC current gain ≥50 at 25 mA/20 V.
Technical Context
This discrete NPN bipolar junction transistor operates with open-base VCEO and open-emitter VCBO both specified at 300 V, supporting high-impedance voltage handling in off-state conditions. Its 60 MHz fT and 1.6 pF Cre indicate suitability for HF signal amplification and switching up to ~30 MHz with minimal Miller effect.
The device exhibits ICBO ≤10 nA at 200 V and 25 °C, confirming low leakage in high-voltage bias networks. VCEsat ≤600 mV at IC = 30 mA / IB = 5 mA ensures efficient on-state conduction in low-duty-cycle pulse applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 300 V - Enables safe operation in 200 V AC line-derived telephony interfaces without breakdown risk. |
| IC (continuous) | 50 mA - Supports low-current switching in ringing generator and codec bias circuits. |
| Ptot @ Tamb ≤25 °C | 200 mW - Requires thermal pad (1 cm² copper) to maintain junction temperature ≤150 °C. |
| hFE @ VCE=20 V, IC=25 mA | ≥50 - Provides sufficient DC gain for base-driven switching with modest drive current. |
| fT @ VCE=10 V, IC=10 mA | 60 MHz - Validates usable bandwidth for voice-band and sub-MHz control signal amplification. |
| Cre @ VCB=30 V, f=1 MHz | 1.6 pF - Limits Miller feedback in high-gain amplifier stages, improving stability. |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 3-pin, 1.3 mm pitch, 2.0 × 1.25 × 0.95 mm body, single-sided copper PCB mounting pad (1 cm²) required for thermal compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal accepting low-current drive (IB ≤50 mA peak) to switch collector current. |
| 2 | Emitter | Reference node for biasing; tied to ground or negative rail in common-emitter configurations. |
| 3 | Collector | High-voltage output node; connects to 300 V supply rails or transformer-coupled line interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 300 V VCBO/VCEO enables direct use in telephone line feed circuits without external voltage dividers. |
| Low feedback capacitance | 1.6 pF Cre minimizes unwanted coupling in high-gain amplifier stages, reducing oscillation risk. |
| Thermally optimized SOT323 | Rth(j-a) = 625 K/W with 1 cm² copper pad supports reliable operation at full 200 mW dissipation. |
| Controlled saturation behavior | VCEsat ≤600 mV at IC=30 mA/IB=5 mA ensures predictable on-state voltage drop in switching designs. |
Applications
| Telephony Line Interface | Ringing Generator Circuit |
|---|---|
Use Scenario: Isolating and switching 90 V RMS AC ringing signals on POTS lines. IC Role / Device Role / Timing Role: NPN high-voltage switch controlling transformer primary current during ring burst. Use Value: 300 V rating prevents breakdown during 170 V peak ringing transients; low Cre avoids signal distortion. |
Use Scenario: Generating 20 Hz–25 Hz AC bursts to alert analog telephone endpoints. IC Role / Device Role / Timing Role: High-voltage switching element driving step-up transformer primary. Use Value: 50 mA continuous rating sustains 20–30 mA load current; 60 MHz fT accommodates clean square-wave edge control. |
| Codec Bias Network | Off-Hook Detection |
Use Scenario: Providing stable bias current to analog front-end codecs in VoIP gateways. IC Role / Device Role / Timing Role: Constant-current source regulating reference voltage nodes. Use Value: hFE ≥50 ensures predictable current mirroring; ICBO ≤10 nA maintains accuracy over temperature. |
Use Scenario: Monitoring loop current to detect handset lift-off in legacy PBX systems. IC Role / Device Role / Timing Role: Low-leakage sensing transistor in high-impedance current path. Use Value: VEBO = 5 V and IEBO ≤50 nA allow safe operation across open-loop detection thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC846B,215 | Lower VCEO (65 V), higher hFE (200–450), same SOT323 package. | Not suitable for >100 V line applications; limited to low-voltage bias/signal stages. | Select only where voltage stress <65 V and high DC gain is prioritized over breakdown margin. |
| MMBT5551 | Higher VCEO (160 V), TO-92 package, 600 mW Ptot, larger footprint. | Requires through-hole assembly; insufficient for 300 V telephony interfaces. | Choose when board space allows TO-92 and voltage requirements are capped at 160 V. |
Compared with BC846B,215 and MMBT5551, BF820W uniquely satisfies 300 V telephony line requirements in a miniature SOT323 package, offering the only combination of certified high-voltage rating, low Cre, and surface-mount compatibility among these three.
Availability
BF820W is available at Aetrix Electronics and suitable for telephony line interface, ringing generator, codec bias, and off-hook detection applications requiring stable component supply and long-term industrial availability.
Supply support for BF820W 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
BF820W belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust performance in analog telephony infrastructure and professional communication equipment under sustained voltage stress.
FAQ
What is the maximum allowable collector-emitter voltage for BF820W?
The absolute maximum VCEO is 300 V with the base open, as defined in IEC 60134 limiting values. This rating applies under steady-state DC conditions and is validated with the specified SOT323 PCB mounting pad (1 cm² copper). Operation above this voltage risks permanent junction breakdown.
Can BF820W be used in automotive applications?
No. The BF820W data sheet explicitly states it is non-automotive qualified, having been changed to non-automotive status in revision v.4 (20241008). Automotive use requires Nexperia's -Q qualified alternatives, which undergo extended temperature, AEC-Q101 testing, and PPAP documentation not applicable to BF820W.
What is the thermal resistance from junction to ambient for BF820W?
Rth(j-a) is 625 K/W when mounted on a single-sided, tin-plated PCB with a 1 cm² copper mounting pad for the collector. This value assumes no additional heatsinking and defines the worst-case thermal path for derating calculations at elevated ambient temperatures.
How does BF820W's feedback capacitance affect circuit stability?
With Cre = 1.6 pF at VCB = 30 V and 1 MHz, BF820W exhibits low Miller capacitance, reducing unintended phase shift in common-emitter amplifiers. This supports stable gain up to ~30 MHz and minimizes risk of oscillation in high-gain telephony interface stages without added compensation.
BF820W,115 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):
- 50 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 30mA
- Current - Collector Cutoff (Max):
- 10nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 25mA, 20V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 60MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BF820W,115 FAQ
1.How can I place an order for BF820W,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF820W,115 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 BF820W,115 reliable?
The price and inventory of BF820W,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF820W,115 is usually 5 days.
3.What payment methods are accepted for BF820W,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF820W,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF820W,115?
BF820W,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF820W,115 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 BF820W,115?
For technical support, including BF820W,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF820W,115 requirements.
6.How does Aetrix verify that BF820W,115 is sourced from the original manufacturer or authorized distributors?
All BF820W,115 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 BF820W,115 meets industry standards.
7.What is the process for return or replacement of BF820W,115?
All BF820W,115 units undergo pre-shipment inspection (PSI). If there is an issue with BF820W,115, 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 BF820W,115 part is unused and in its original packaging.
Return procedure for BF820W,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BF820W,115 Tags
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