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Nexperia USA Inc. BF820,215
- Part No.:
- BF820,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BF820,215.pdf
- Description:
- TRANS NPN 300V 0.05A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,578
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Product details
Overview
BF820 from Nexperia is an NPN high-voltage transistor in SOT23 package, designed for off-state voltage blocking up to 300 V (VCBO/VCEO), rated for 50 mA continuous collector current, and delivering 60 MHz transition frequency at 10 V VCE and 10 mA IC - used in telephony line interface circuits requiring high breakdown with low-current switching.
For engineers reviewing the BF820 datasheet, BF820 pinout, BF820 application, or BF820 equivalent, key selection criteria include verified 300 V BVCEO capability, SOT23 thermal resistance of 500 K/W on FR4, DC current gain ≥50 at 25 mA/20 V, and confirmed PNP complement BF821 for push-pull configurations.
Technical Context
The BF820 operates as a single NPN bipolar junction transistor optimized for high-voltage, low-current linear and switching roles in analog signal conditioning and line driver stages. Its 300 V collector-base and collector-emitter breakdown ratings enable direct interface with telephone central office voltages (e.g., −48 V with ringing surges).
It exhibits a typical transition frequency of 60 MHz under 10 V VCE and 10 mA IC conditions, with base-emitter cutoff current ≤50 nA at 5 V VEB and collector-base leakage ≤10 nA at 200 V VCB and 25 °C - supporting stable biasing in high-impedance input stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 300 V - supports operation across telecom line surge transients without avalanche conduction |
| IC (max) | 50 mA - defines maximum continuous load current in active-region amplification or switching |
| hFE (min) | 50 at VCE = 20 V, IC = 25 mA - ensures predictable base drive requirements in linear gain stages |
| fT | 60 MHz - enables RF-coupled audio and narrowband signal amplification up to ~10 MHz usable bandwidth |
| VCE(sat) | 600 mV at IC = 30 mA, IB = 5 mA - limits power loss and heating during saturated switching |
| Cre | 1.6 pF at VCB = 30 V - minimizes Miller effect in high-frequency amplifier feedback paths |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 × 1.3 × 1.0 mm body, FR4 board-mounted thermal resistance 500 K/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input node; requires series resistor to limit IB ≤50 mA peak per absolute max rating |
| 2 | Emitter | Common reference terminal; tied to system ground or negative rail in common-emitter configuration |
| 3 | Collector | High-voltage output node; withstands 300 V reverse bias when emitter is open (VCBO) or base is open (VCEO) |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 300 V VCBO/VCEO enables direct integration into -48 V telecom line interface circuits without external clamping |
| Low leakage performance | ICBO ≤10 nA at 200 V and 25 °C ensures minimal standby current in always-on monitoring circuits |
| SOT23 footprint compatibility | Standard 3-pin SOT23 layout allows drop-in replacement in space-constrained PCB designs |
| Thermal robustness | 150 °C max junction temperature and 500 K/W Rth(j-a) support reliable operation on standard FR4 without heatsinking |
Applications
| Telephone Line Interface | Ring Detection Circuit |
|---|---|
Use Scenario: Isolating and conditioning analog voice signals on PSTN lines subject to −48 V DC bias and 90 VAC ringing. IC Role / Device Role / Timing Role: NPN switch/amplifier controlling line feed current and detecting ring voltage presence via collector voltage swing. Use Value: 300 V breakdown prevents latch-up during 90 VAC ring bursts; 60 MHz fT supports clean detection edge response. | Use Scenario: Detecting AC ring signal superimposed on −48 V DC battery feed in VoIP gateway line cards. IC Role / Device Role / Timing Role: High-impedance sensing node amplifier with base biased near VEB threshold to trigger on ring envelope peaks. Use Value: ≤50 nA IEBO ensures negligible bias current error; 50 hFE minimum guarantees consistent turn-on sensitivity. |
| Off-Hook Detection | DC Loop Supervision |
Use Scenario: Monitoring loop current changes when handset goes off-hook in analog telephony systems. IC Role / Device Role / Timing Role: Current-sensing transistor in series with line feed resistor, operating in active region to translate loop current to voltage. Use Value: 50 mA IC rating accommodates 20–50 mA loop currents; 600 mV VCE(sat) minimizes voltage drop impact on supervision accuracy. | Use Scenario: Maintaining DC continuity and fault detection in legacy PBX and alarm panel wiring loops. IC Role / Device Role / Timing Role: High-side current mirror or emitter follower providing stable bias for loop current measurement shunt. Use Value: 300 V rating tolerates open-circuit transients; 1.6 pF Cre avoids phase shift in feedback paths of precision current monitors. |
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 |
|---|---|---|---|
| BC817-40,215 | Lower VCEO (45 V), higher IC (500 mA), hFE 250–630 - optimized for general-purpose switching, not HV line interface | Not suitable for >100 V applications; lacks telecom-grade leakage and breakdown specs | Select only if operating voltage remains <45 V and higher current drive is required |
| BF821,215 | PNP complement; identical VCEO/VCBO (300 V), IC (50 mA), fT (60 MHz), but opposite polarity and pinout (1=C, 2=E, 3=B) | Used in complementary push-pull or differential pair configurations, not standalone NPN replacement | Choose for matched high-voltage complementary stages; not a functional substitute for BF820 |
Compared with BC817-40,215 and BF821,215, the BF820 uniquely delivers 300 V breakdown in an NPN SOT23 device with validated low-leakage behavior - making it irreplaceable for telecom line interface where voltage margin and leakage-limited bias stability are non-negotiable.
Availability
BF820 is available at Aetrix Electronics and suitable for telephone line interface, ring detection, off-hook supervision, and DC loop monitoring requiring stable component supply in industrial telecom infrastructure and legacy voice equipment.
Supply support for BF820 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, with manufacturing in Asia and Europe.
The BF820 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for analog signal integrity and surge-tolerant operation in professional telephony and wired communication equipment.
FAQ
Is BF820 automotive-qualified?
No. The BF820 is explicitly designated as non-automotive qualified per Nexperia's 2023 data sheet revision history. It has not undergone AEC-Q101 testing or qualification for automotive environments, and its use in safety-critical or vehicle-mounted systems is not supported.
What is the maximum safe operating voltage for BF820 in common-emitter configuration?
In common-emitter mode with base open, the absolute maximum VCEO is 300 V. Operation above this rating risks irreversible avalanche breakdown. Derating to ≤240 V is recommended for long-term reliability under transient conditions per IEC 60134 limiting values guidance.
Can BF820 replace BC847 in a 12 V circuit?
Yes, electrically - but not optimally. While both are SOT23 NPN transistors, the BF820's 300 V rating and lower hFE (50 min vs. BC847's 110–800) result in higher base drive requirements and unnecessary voltage overhead in low-voltage applications, increasing cost and board space without benefit.
Does BF820 have a specified ESD rating?
No ESD rating (e.g., HBM or CDM) is published in the official Nexperia BF820 data sheet. Handling should follow standard static-sensitive device protocols; no on-chip ESD protection structure is documented, and external protection is advised in exposed line-interface implementations.
BF820,215 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):
- 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:
- 250 mW
- Frequency - Transition:
- 60MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BF820,215 FAQ
1.How can I place an order for BF820,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF820,215 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 BF820,215 reliable?
The price and inventory of BF820,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF820,215 is usually 5 days.
3.What payment methods are accepted for BF820,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF820,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF820,215?
BF820,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF820,215 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 BF820,215?
For technical support, including BF820,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF820,215 requirements.
6.How does Aetrix verify that BF820,215 is sourced from the original manufacturer or authorized distributors?
All BF820,215 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 BF820,215 meets industry standards.
7.What is the process for return or replacement of BF820,215?
All BF820,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF820,215, 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 BF820,215 part is unused and in its original packaging.
Return procedure for BF820,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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