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Nexperia USA Inc. BF820W-QF
- Part No.:
- BF820W-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BF820W-QF.pdf
- Description:
- TRANS NPN 300V 0.05A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BF820W-QF from Nexperia is an AEC-Q101-qualified 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 fT and 1.6 pF Cre, serving as a high-voltage switching element in telecom line interface circuits.
For engineers reviewing the BF820W-QF datasheet, BF820W-QF pinout, BF820W-QF application, or BF820W-QF equivalent, key selection criteria include its 300 V breakdown rating, automotive qualification, low feedback capacitance, thermal resistance of 625 K/W, and SC-70 footprint compatibility with space-constrained PCB layouts.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or switching mode with a DC current gain (hFE) of ≥50 at VCE = 20 V and IC = 25 mA. Its 300 V collector-base and collector-emitter breakdown voltages enable use in off-hook detection and ringing generator stages where transient overvoltage immunity is critical.
The device exhibits low feedback capacitance (1.6 pF at VCB = 30 V), supporting stable high-frequency operation up to 60 MHz transition frequency. Its thermal resistance (625 K/W, junction-to-ambient on single-sided 1 cm² copper pad) defines safe operating area limits under pulsed and continuous bias conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 300 V - supports telecom line interface circuits exposed to ±170 V AC ringing and lightning-induced transients |
| IC (continuous) | 50 mA - defines maximum steady-state current in off-hook detection or biasing networks |
| Ptot @ Tamb ≤ 25 °C | 200 mW - sets power handling limit on standard FR4 PCB with minimal copper area |
| fT | 60 MHz - enables stable amplification or switching up to audio and low-RF frequencies |
| Cre | 1.6 pF - minimizes Miller effect in high-gain amplifier configurations |
| hFE | ≥50 @ VCE = 20 V, IC = 25 mA - ensures reliable current amplification in analog sensing paths |
| Rth(j-a) | 625 K/W - requires thermal derating above 25 °C ambient; full rating only on specified 1 cm² copper pad |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, single-row 3-terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control electrode; requires current-limited drive (max IBM = 50 mA peak) to avoid saturation delay |
| 2 | Emiter (E) | Current source terminal; connected to ground or low-impedance return path in common-emitter switching |
| 3 | Collector (C) | High-voltage output node; mounted on 1 cm² copper pad per datasheet for thermal compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
| 300 V breakdown rating | Enables direct interface with POTS line voltages without external voltage clamping |
| 1.6 pF feedback capacitance | Reduces risk of oscillation in high-gain amplifier stages used in voiceband signal conditioning |
| SOT323 footprint | Supports automated placement and reflow soldering on dense telecom PCBs with <2.5 mm board height constraints |
Applications
| Telecom Line Interface | Automotive Body Control |
|---|---|
Use Scenario: Off-hook detection and ringing signal injection in VoIP gateways and PBX systems. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling AC line feed during call setup and teardown. Use Value: 300 V rating eliminates need for series Zener clamping; low Cre prevents signal distortion at 20 Hz–4 kHz voiceband. | Use Scenario: Load switching for 24 V HVAC actuators and door lock solenoids in commercial vehicles. IC Role / Device Role / Timing Role: Medium-power discrete switch driving inductive loads with flyback protection. Use Value: AEC-Q101 qualification ensures robustness across -40 °C to +125 °C ambient; 50 mA IC supports pilot-stage control of higher-current drivers. |
| Industrial Sensor Biasing | Medical Equipment Power Sequencing |
Use Scenario: Precision current source for bridge sensor excitation in pressure transducers. IC Role / Device Role / Timing Role: Linear-mode current regulator with stable hFE ≥50 over temperature. Use Value: Tight hFE min spec enables predictable gain in closed-loop bias networks; low ICBO (<10 nA @ 25 °C) minimizes offset drift. | Use Scenario: Controlled power-up sequencing of isolated DC/DC converters in patient-monitoring devices. IC Role / Device Role / Timing Role: Delayed-enable switch isolating auxiliary rails until main supply stabilizes. Use Value: 60 MHz fT allows clean edge control in µs-scale timing circuits; SOT323 package fits tight spacing near microcontroller GPIOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX851 | Higher VCEO (350 V), larger SOT89 package (4.5 mm × 2.5 mm), Rth(j-a) = 125 K/W | Better thermal performance but incompatible footprint; suited for higher-power telecom hybrids | Select when >200 mW dissipation is required and board space permits larger package |
| BC817-40W | Lower VCEO (45 V), same SOT323 footprint, hFE = 250–630, Ptot = 300 mW | Not suitable for >45 V applications; optimized for general-purpose low-voltage switching | Choose only for non-high-voltage logic-level or signal-switching roles where 300 V rating is unnecessary |
Compared with ZTX851 and BC817-40W, BF820W-QF uniquely balances 300 V capability, AEC-Q101 qualification, and ultra-compact SOT323 packaging-making it optimal for space-constrained, high-reliability telecom and automotive subsystems requiring precise high-voltage switching without thermal derating penalties.
Availability
BF820W-QF is available at Aetrix Electronics and suitable for telecom line interface, automotive body control, industrial sensor biasing, and medical equipment power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BF820W-QF 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.
BF820W-QF belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for telecom infrastructure and automotive subsystems demanding robust 300 V operation in miniature surface-mount packages.
FAQ
Is BF820W-QF pin-compatible with standard SOT323 NPN transistors like BC847?
No. While both use SOT323, BF820W-QF has base-emitter-collector pinout (1-B, 2-E, 3-C), whereas BC847 variants commonly use emitter-base-collector (1-E, 2-B, 3-C). Physical insertion into the same footprint will result in incorrect circuit connection and potential damage.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current (IBM) is 50 mA, but continuous DC base current must be limited to ensure IC ≤ 50 mA and junction temperature stays below 150 °C. At VCE = 20 V and hFE = 50, sustained IB > 1 mA risks exceeding Ptot = 200 mW on standard PCB layout.
Does BF820W-QF support operation at 125 °C ambient temperature?
Yes, but with significant thermal derating. At Tamb = 125 °C, usable power dissipation drops to ~40 mW (based on Rth(j-a) = 625 K/W and Tj(max) = 150 °C), limiting IC to approximately 10 mA continuous. Derating curves are provided in Nexperia's full datasheet Figure 10.
Can BF820W-QF replace BF820W in existing designs?
Yes-BF820W-QF is the automotive-qualified variant of BF820W, sharing identical electrical specifications, pinout, and package. The "QF" suffix denotes AEC-Q101 qualification and enhanced traceability; no layout or schematic changes are needed for drop-in replacement in new or legacy automotive designs.
BF820W-QF 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-QF FAQ
1.How can I place an order for BF820W-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BF820W-QF 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-QF reliable?
The price and inventory of BF820W-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF820W-QF is usually 5 days.
3.What payment methods are accepted for BF820W-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF820W-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF820W-QF?
BF820W-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF820W-QF 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-QF?
For technical support, including BF820W-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF820W-QF requirements.
6.How does Aetrix verify that BF820W-QF is sourced from the original manufacturer or authorized distributors?
All BF820W-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BF820W-QF?
All BF820W-QF units undergo pre-shipment inspection (PSI). If there is an issue with BF820W-QF, 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-QF part is unused and in its original packaging.
Return procedure for BF820W-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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