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Diodes Incorporated BSP19TA
- Part No.:
- BSP19TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BSP19TA.pdf
- Description:
- TRANS NPN 350V 0.5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,933
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Product details
Overview
BSP19TA from Diodes Incorporated is an NPN silicon planar high-voltage transistor with VCEO = 350 V, VCBO = 400 V, and continuous IC = 0.5 A in SOT223 package; it serves as a high-voltage switching element in offline power supplies, relay drivers, and industrial control interfaces where robust breakdown margin and low saturation voltage are required.
For engineers reviewing the BSP19TA datasheet, BSP19TA pinout, BSP19TA application, or BSP19TA equivalent, key selection criteria include verified VCEO derating at elevated Tj, confirmed hFE stability across IC = 20–100 mA, measured fT = 70 MHz at 10 mA/10 V, and SOT223 thermal performance under pulsed switching conditions.
Technical Context
This device employs a planar epitaxial structure optimized for high-voltage blocking and fast switching in DC-DC converters and AC line-switched circuits. Its 350 V VCEO rating enables direct use in 230 VAC rectified bus applications without snubber networks, while the 0.5 V VCE(sat) at IC = 50 mA / IB = 4 mA supports efficient low-power switching.
The hFE range of 40–50 (IC = 20 mA, VCE = 5 V) and 50 typical (IC = 100 mA, VCE = 5 V) provides predictable base drive requirements, and the 70 MHz fT confirms usable gain up to mid-VHF frequencies in linear amplifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 350 V - Enables direct switching on 230 VAC-derived 325 VDC rails without voltage clamping |
| VCBO | 400 V - Provides headroom for transient overvoltage during inductive load turn-off |
| IC (cont.) | 0.5 A - Supports relay coil driving and small solenoid control at ambient ≤25°C |
| VCE(sat) | 0.5 V @ 50 mA/4 mA - Limits conduction loss to ≤25 mW in low-duty-cycle switching |
| fT | 70 MHz @ 10 mA/10 V - Allows stable operation as RF pre-driver up to ~20 MHz |
| hFE | 40–50 @ 20 mA/5 V - Ensures reliable base current calculation for fixed-bias switch designs |
Pinout & Package
SOT223 package with standard 4-pin configuration (3 active + 1 thermal tab); lead-free and RoHS-compliant per Diodes Incorporated specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; electrically isolated from thermal pad |
| 2 (Base) | Control input | Receives forward bias current to enable conduction; requires series resistor for current limiting |
| 3 (Collector) | High-voltage output node | Switches loads referenced to positive rail; connected to 350 V max potential |
| Tab (Collector) | Thermal and electrical connection | Internally tied to collector; must be soldered to PCB copper for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | VCEO = 350 V ensures safe operation in 230 VAC mains-connected circuits |
| Low saturation voltage | VCE(sat) = 0.5 V minimizes power loss in medium-current switching |
| Stable current gain | hFE ≥40 at 20 mA supports predictable base drive design |
| High transition frequency | fT = 70 MHz allows use in broadband pre-amplifier stages |
Applications
| Offline SMPS Primary Switch | Industrial Relay Driver |
|---|---|
Use Scenario: Switching transistor in flyback converter primary side operating from 325 VDC bus derived from 230 VAC rectification. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer to transformer primary; duty-cycled at 65 kHz. Use Value: 350 V VCEO eliminates need for external clamping diodes; 0.5 V VCE(sat) limits conduction loss to <30 mW at 50 mA peak. | Use Scenario: Driving 12 V, 400 Ω coil relay in programmable logic controller output module. IC Role / Device Role / Timing Role: Low-speed digital switch turning relay ON/OFF under microcontroller GPIO control. Use Value: hFE ≥40 ensures full saturation with ≤1 mA base current; SOT223 thermal pad sustains 0.5 A pulsed load. |
| AC Line Voltage Monitor | High-Voltage Signal Amplifier |
Use Scenario: Detecting zero-crossing and overvoltage events on 230 VAC line via resistive divider and transistor comparator stage. IC Role / Device Role / Timing Role: High-impedance emitter-follower buffer isolating sensing circuitry from line-referenced nodes. Use Value: 400 V VCBO withstands peak line transients; 5 V VEBO permits safe base bias referencing. | Use Scenario: Wideband pre-amplifier stage amplifying 1–10 MHz sensor signals before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at 10 mA collector current for linear gain. Use Value: 70 MHz fT delivers flat gain response up to 20 MHz; Cobo = 10 pF minimizes Miller effect distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX450 | VCEO = 300 V, hFE = 100 min @ 100 mA, SOT89 package | Limited to 265 VDC bus; higher gain reduces base drive burden | Select when lower VCEO suffices and higher hFE simplifies driver design |
| MJD112 | VCEO = 100 V, IC = 2 A, TO-220 package | Insufficient voltage rating for 230 VAC-derived rails; suited for low-voltage motor drives | Avoid in high-line applications; consider only for sub-100 V systems requiring higher current |
Compared with ZTX450 and MJD112, BSP19TA uniquely balances 350 V blocking capability with SOT223 thermal efficiency and predictable 40–50 hFE, making it optimal for space-constrained 230 VAC interface circuits where voltage margin and thermal management are co-critical.
Availability
BSP19TA is available at Aetrix Electronics and suitable for offline power supplies, industrial relay drivers, AC line monitors, and high-voltage signal amplifiers requiring stable component supply across extended production lifecycles.
Supply support for BSP19TA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The BSP19TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching and amplification in AC mains-connected industrial and power conversion equipment.
FAQ
What is the maximum allowable junction temperature for BSP19TA?
The BSP19TA has a specified operating junction temperature range of –55°C to +150°C. Derating of Ptot begins above 25°C ambient, with thermal resistance RθJA ≈ 62.5°C/W for standard SOT223 mounting on 1-in² 2-oz copper. Full 2 W dissipation is only valid at Tamb = 25°C with adequate heatsinking.
Is BSP19TA pin-compatible with BSP16TA?
Yes - BSP19TA and BSP16TA share identical SOT223 pinout (E-B-C-Tab) and complementary NPN/PNP functionality. BSP16TA is the PNP counterpart with matching VCEO = –350 V, enabling push-pull or complementary pair configurations in high-voltage driver stages.
Can BSP19TA be used in linear amplifier mode?
Yes - its fT = 70 MHz and hFE stability across 20–100 mA support Class-A or AB linear amplification up to ~20 MHz. Operation requires careful thermal design due to Ptot = 2 W limit and must avoid secondary breakdown by limiting VCE × IC product within Safe Operating Area curves.
Does BSP19TA meet RoHS and REACH requirements?
Yes - BSP19TA is RoHS-compliant (lead-free terminations, homogeneous material compliance) and REACH-conforming per Diodes Incorporated's published declarations. The SOT223 package uses matte tin plating and halogen-free molding compound, certified to JEDEC J-STD-020 moisture sensitivity level 1.
BSP19TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 350 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 4mA, 50mA
- Current - Collector Cutoff (Max):
- 20nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 100mA, 5V
- Power - Max:
- 2 W
- Frequency - Transition:
- 70MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
BSP19TA FAQ
1.How can I place an order for BSP19TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BSP19TA 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 BSP19TA reliable?
The price and inventory of BSP19TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP19TA is usually 5 days.
3.What payment methods are accepted for BSP19TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP19TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSP19TA?
BSP19TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSP19TA 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 BSP19TA?
For technical support, including BSP19TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP19TA requirements.
6.How does Aetrix verify that BSP19TA is sourced from the original manufacturer or authorized distributors?
All BSP19TA 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 BSP19TA meets industry standards.
7.What is the process for return or replacement of BSP19TA?
All BSP19TA units undergo pre-shipment inspection (PSI). If there is an issue with BSP19TA, 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 BSP19TA part is unused and in its original packaging.
Return procedure for BSP19TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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