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Nexperia USA Inc. BF820W,135
- Part No.:
- BF820W,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BF820W,135.pdf
- Description:
- TRANS NPN 300V 0.05A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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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 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 behavior, SOT323 thermal resistance of 625 K/W, and DC current gain ≥50 at 25 mA/20 V.
Technical Context
This discrete NPN transistor operates with open-base VCEO and open-emitter VCBO both rated at 300 V, supporting high-impedance voltage handling in off-state while maintaining 60 MHz fT for moderate-frequency amplification or switching. Its 1.6 pF Cre and 50–100 mA ICM enable stable performance in line interface stages where capacitive loading and transient current must be tightly controlled.
The device uses a single-sided PCB mounting pad (1 cm²) for the collector, resulting in a junction-to-ambient thermal resistance of 625 K/W. With 5 V VEBO and 150 °C max junction temperature, it supports operation across –65 °C to +150 °C ambient, suitable for industrial-grade telephony hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 300 V - Enables safe operation in 200 V AC line-coupled telephony interfaces without breakdown risk. |
| IC (continuous) | 50 mA - Supports steady-state biasing of line driver stages without thermal runaway under derated conditions. |
| fT | 60 MHz - Allows linear amplification up to voiceband harmonics and basic pulse shaping in analog front-ends. |
| Cre | 1.6 pF - Minimizes Miller effect distortion in high-gain common-emitter configurations at 1 MHz. |
| hFE | ≥50 @ 25 mA, 20 V - Ensures predictable base drive requirements for reliable saturation in switching applications. |
| Rth(j-a) | 625 K/W - Requires minimal copper area (1 cm² collector pad) for thermal management on standard FR4 PCBs. |
| VCE(sat) | 600 mV @ 30 mA / 5 mA - Delivers low conduction loss in active-low switch topologies with tight voltage margins. |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 3-pin, 1.3 mm pitch, 2.0 mm × 1.25 mm × 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 electrode; requires ≤5 mA peak base current to saturate collector at 30 mA load. |
| 2 | Emiter | Current sink node; tied to ground or negative rail in common-emitter configurations. |
| 3 | Collector | High-voltage output node; thermally coupled to PCB pad for 200 mW dissipation at Tamb ≤ 25 °C. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 300 V VCBO/VCEO enables direct interface with POTS line voltages up to ±170 V peak. |
| Low feedback capacitance | 1.6 pF Cre reduces instability risk in high-gain amplifier stages operating near fT. |
| Thermally optimized SOT323 | 625 K/W Rth(j-a) with defined 1 cm² collector pad allows predictable thermal design on standard PCBs. |
| Stable DC gain | hFE ≥50 at 25 mA ensures consistent base resistor sizing across production lots and temperatures. |
Applications
| Telephone Line Interface | Ring Signal Detection |
|---|---|
Use Scenario: Isolating and conditioning analog signals between subscriber line interface circuit (SLIC) and codec in VoIP gateways. IC Role / Device Role / Timing Role: NPN switch amplifying ring detection pulses and attenuating line transients before ADC input. Use Value: 300 V rating withstands 170 V peak ring voltage; 1.6 pF Cre prevents false triggering from fast line edges. |
Use Scenario: Detecting 20 Hz–30 Hz AC ring signals superimposed on –48 V DC battery feed in PBX systems. IC Role / Device Role / Timing Role: High-impedance emitter-follower buffer isolating SLIC output from downstream comparator. Use Value: 50 mA IC and 60 MHz fT support clean amplification of 30 Hz fundamental with minimal phase shift. |
| Off-Hook Supervision | DC Loop Current Sensing |
Use Scenario: Monitoring loop closure state by sensing current flow through tip/ring pair during handset lift. IC Role / Device Role / Timing Role: Low-saturation switch in series with line feed resistor to generate measurable voltage drop. Use Value: 600 mV VCE(sat) at 30 mA enables accurate current measurement with <1% error using 20 Ω sense resistor. |
Use Scenario: Converting 20–60 mA DC loop current into proportional voltage for microcontroller ADC sampling. IC Role / Device Role / Timing Role: Linear-mode current mirror reference transistor in precision sensing path. Use Value: hFE ≥50 ensures stable current transfer ratio; 150 °C Tj rating supports long-term reliability in sealed enclosures. |
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 |
|---|---|---|---|
| BC847BW | Max VCEO = 45 V, hFE = 110–800, fT = 100 MHz, Cre = 4.5 pF | Limited to low-voltage telecom subsystems (e.g., codec biasing), not line-side interface | Select when higher hFE and bandwidth are needed, but voltage stress is <50 V. |
| MMBT5551 | Max VCEO = 160 V, IC = 600 mA, Ptot = 625 mW, Cre = 6 pF | Higher power handling but larger SOT23 package and higher capacitance limits high-frequency stability | Choose for higher current loads where 160 V margin suffices and board space permits SOT23. |
Compared with BC847BW and MMBT5551, BF820W uniquely balances 300 V capability, ultra-low Cre, and SOT323 footprint-making it irreplaceable for compact, high-voltage telephony signal conditioning where voltage margin and capacitive loading are critical constraints.
Availability
BF820W is available at Aetrix Electronics and suitable for telephone line interface, ring signal detection, off-hook supervision, and DC loop current sensing requiring stable component supply in industrial telecom hardware.
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 discrete and logic devices, headquartered in Nijmegen, Netherlands.
BF820W belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for analog signal integrity and robustness in professional telephony infrastructure equipment.
FAQ
What is the maximum allowable collector-emitter voltage for BF820W in continuous operation?
The BF820W has a maximum VCEO rating of 300 V under open-base conditions, verified per IEC 60134 Absolute Maximum Ratings. This applies to DC and repetitive pulse operation with duty cycle ≤ 2% and pulse width ≤ 300 µs, provided junction temperature remains ≤ 150 °C and PCB thermal pad meets specification.
Can BF820W be used in avalanche mode for transient protection?
No-BF820W is not characterized or qualified for controlled avalanche operation. Its 300 V rating reflects safe non-destructive blocking capability only; intentional avalanche use may cause parametric drift or failure due to lack of energy-rated SOA data in the datasheet.
Is BF820W automotive-qualified?
No-per Nexperia's revision history (v.4, 20241008), BF820W is explicitly marked as non-automotive qualified. Automotive alternatives require separate -Q suffix parts (e.g., BF820W-Q), which undergo AEC-Q101 testing and have distinct qualification documentation.
What is the recommended soldering profile for BF820W's SOT323 package?
Nexperia specifies reflow soldering per JEDEC J-STD-020, with peak temperature ≤ 260 °C, time above 217 °C ≤ 60 seconds, and ramp rate ≤ 3 °C/s. The footprint shown in Figure 2 (sot323_fr) defines 0.55 mm solder paste stencil apertures and 1.325 mm pad centers for reliable joint formation.
BF820W,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):
- 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,135 FAQ
1.How can I place an order for BF820W,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF820W,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 BF820W,135 reliable?
The price and inventory of BF820W,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF820W,135 is usually 5 days.
3.What payment methods are accepted for BF820W,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF820W,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF820W,135?
BF820W,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF820W,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 BF820W,135?
For technical support, including BF820W,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF820W,135 requirements.
6.How does Aetrix verify that BF820W,135 is sourced from the original manufacturer or authorized distributors?
All BF820W,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 BF820W,135 meets industry standards.
7.What is the process for return or replacement of BF820W,135?
All BF820W,135 units undergo pre-shipment inspection (PSI). If there is an issue with BF820W,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 BF820W,135 part is unused and in its original packaging.
Return procedure for BF820W,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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