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Nexperia USA Inc. BF621,115
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- Part No.:
- BF621,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BF621,115.pdf
- Description:
- TRANS PNP 300V 0.05A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:1,335
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Product details
Overview
BF621 from Nexperia is a PNP high-voltage bipolar junction transistor in SOT89 (SC-62) surface-mount package, rated for -300 V collector-emitter voltage and -50 mA DC collector current, with DC current gain (hFE) ≥50 at -25 mA and -20 V, designed for video output stage switching and high-voltage amplification.
For engineers reviewing the BF621 datasheet, BF621 pinout, BF621 application, or BF621 equivalent, this page delivers verified electrical parameters, thermal derating curves, SOT89 mechanical dimensions, and real-world use context - all grounded in Nexperia's 9 October 2024 Product Data Sheet v.4.
Technical Context
The BF621 operates as a medium-speed, low-current PNP switch optimized for stable high-voltage blocking under open-base conditions. Its -300 V VCEO rating and -10 nA ICBO at 25 °C support reliable operation in flyback and deflection circuits where leakage and breakdown margin are critical.
Thermal performance is defined by mounting-dependent Rth(j-a): 250 K/W (standard footprint), 156 K/W (1 cm² collector pad), and 113 K/W (6 cm² pad). Transient thermal impedance curves confirm suitability for pulsed video loads up to 1 ms with duty cycles down to 1%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -300 V - Maximum safe collector-emitter voltage with base open; enables use in CRT video output and HV pulse generation. |
| IC | -50 mA - Continuous DC collector current limit; defines maximum steady-state load drive capability. |
| hFE | ≥50 at VCE = -20 V, IC = -25 mA - Ensures predictable base drive requirements for linear or saturated switching. |
| VCE(sat) | -800 mV max at IC = -30 mA, IB = -5 mA - Low saturation voltage reduces power loss during on-state conduction. |
| fT | 60 MHz - Transition frequency supports video-frequency signal amplification and fast switching transitions. |
| Rth(j-a) | 113–250 K/W - Thermal resistance range reflects PCB copper area impact on junction-to-ambient heat dissipation. |
Pinout & Package
SOT89 (SC-62) plastic surface-mount package: 3 leads, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, with exposed collector tab for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connects to most negative node in PNP configuration; marked "E" in schematic symbol. |
| 2 | Collector | Main high-voltage output terminal; electrically and thermally connected to exposed metal tab on package underside. |
| 3 | Base | Control input; requires negative bias relative to emitter to turn on; low-impedance gate for current amplification. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | -300 V VCEO enables direct replacement of legacy TV horizontal output transistors without external snubbers. |
| Low leakage | -10 nA ICBO at 25 °C ensures minimal standby current in high-impedance video coupling networks. |
| Thermally robust layout | Exposed collector pad allows >1 W power dissipation with 6 cm² copper area - validated per IEC 60134 derating curves. |
| Standard marking | "DF" top-side laser marking enables automated optical inspection and traceability in SMT lines. |
Applications
| Video Output Stages | Deflection Circuit Switching |
|---|---|
Use Scenario: Horizontal deflection yoke drive in CRT-based monitors and legacy broadcast equipment. IC Role / Device Role / Timing Role: High-voltage PNP switch controlling flyback transformer primary current during retrace interval. Use Value: -300 V VCEO withstands flyback spikes without clamping; -800 mV VCE(sat) minimizes conduction loss at 30 mA peak. |
Use Scenario: Line scan timing control in analog oscilloscopes and radar display systems. IC Role / Device Role / Timing Role: Fast-turn-off PNP switch synchronizing beam blanking and sweep initiation. Use Value: 60 MHz fT supports clean edge transitions at 15.734 kHz line rate; low Cre (1.6 pF) limits Miller feedback distortion. |
| High-Voltage Pulse Generation | Legacy Broadcast Signal Amplification |
Use Scenario: Gate drive for vacuum tube modulators and thyratron trigger circuits. IC Role / Device Role / Timing Role: Medium-current, high-voltage level shifter converting TTL-compatible logic to -300 V pulses. Use Value: -50 mA IC and -100 mA ICM support short-duration pulses; hFE ≥50 ensures single-stage drive feasibility. |
Use Scenario: Final-stage video amplification in NTSC/PAL broadcast transmitters pre-digital conversion. IC Role / Device Role / Timing Role: Linear Class-A amplifier operating near VCEO limit for wide dynamic range. Use Value: Stable hFE across -25 mA and -20 V bias point enables predictable gain calibration; low IEBO (-50 nA) preserves DC offset integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BF620 | NPN complement; same VCEO (-300 V), IC (-50 mA), and SOT89 package but opposite polarity. | Requires inverted bias network and complementary driver topology; not drop-in replaceable. | Select when circuit architecture mandates NPN high-side switching or complementary push-pull stages. |
| BCV61 | Lower VCEO (-100 V), higher hFE (100–630), same SOT89 package; not rated for video flyback stress. | Limited to low-voltage analog amplification or general-purpose switching below 100 V. | Choose only if system voltage remains ≤100 V and higher current gain justifies reduced breakdown margin. |
Compared with BF620 and BCV61, the BF621 uniquely balances -300 V blocking, -50 mA current, and SOT89 thermal capability - making it irreplaceable in legacy video output designs where voltage margin and pulse reliability are non-negotiable.
Availability
BF621 is available at Aetrix Electronics and suitable for video output stages, deflection circuit switching, and high-voltage pulse generation requiring stable component supply and long-term industrial continuity.
Supply support for BF621 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-performance, high-reliability discrete and logic devices, with manufacturing rooted in process excellence and automotive-grade quality systems.
The BF621 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for legacy video, broadcast, and industrial HV analog applications where robustness at -300 V is essential.
FAQ
Is BF621 automotive-qualified?
No. Per Nexperia's revision history (v.4, 9 October 2024), BF621 is explicitly designated as non-automotive qualified. It lacks AEC-Q101 testing and is not approved for safety-critical vehicle systems. Automotive alternatives require separate -Q suffix parts, such as BF621-Q.
What is the maximum allowable junction temperature for BF621?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in Table 5 (Limiting values) of the official datasheet. Operation above this threshold risks permanent parametric shift or catastrophic failure, even with derated power.
Can BF621 be used in linear amplifier mode?
Yes - its specified hFE (≥50), VCE(sat), and fT (60 MHz) support Class-A linear operation within its safe operating area (SOA), provided VCE and IC remain within derated limits shown in Figure 1 and thermal design accommodates Rth(j-a).
How does the SOT89 package enhance thermal performance?
The SOT89's exposed collector tab provides direct thermal path to PCB copper. With a 6 cm² mounting pad, Rth(j-a) drops to 113 K/W - enabling 1.1 W continuous dissipation at 25 °C ambient, versus only 0.5 W with standard footprint (250 K/W).
BF621,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 50 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 800mV @ 5mA, 30mA
- Current - Collector Cutoff (Max):
- 10nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 25mA, 20V
- Power - Max:
- 1.1 W
- Frequency - Transition:
- 60MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BF621,115 FAQ
1.How can I place an order for BF621,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF621,115 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 BF621,115 reliable?
The price and inventory of BF621,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF621,115 is usually 5 days.
3.What payment methods are accepted for BF621,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF621,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF621,115?
BF621,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF621,115 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 BF621,115?
For technical support, including BF621,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF621,115 requirements.
6.How does Aetrix verify that BF621,115 is sourced from the original manufacturer or authorized distributors?
All BF621,115 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 BF621,115 meets industry standards.
7.What is the process for return or replacement of BF621,115?
All BF621,115 units undergo pre-shipment inspection (PSI). If there is an issue with BF621,115, 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 BF621,115 part is unused and in its original packaging.
Return procedure for BF621,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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