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Diodes Incorporated SXTA42TA
- Part No.:
- SXTA42TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
SXTA42TA.pdf
- Description:
- TRANS NPN 300V 0.5A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,466
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Product details
Overview
SXTA42TA from Diodes Incorporated is a 300V NPN high-voltage transistor in SOT89 package, designed for switching and amplification in high-voltage DC-DC converters, flyback controllers, and industrial power supplies. It delivers 500mA continuous collector current, supports 300V collector-emitter breakdown voltage (BVCEO), and operates across –65°C to +150°C with 1W power dissipation capability.
For engineers reviewing the SXTA42TA datasheet, SXTA42TA pinout, SXTA42TA application, or SXTA42TA equivalent, key selection criteria include high-voltage blocking (300V), thermal resistance (125°C/W), hFE range (25–40 at IC = 1–30mA), VCE(sat) ≤ 0.5V, and SOT89 mechanical compatibility in space-constrained power stages.
Technical Context
This NPN bipolar junction transistor is optimized for high-voltage linear and switching operation where robust BVCEO and stable hFE across bias conditions are critical. Its 300V VCBO and VEBO ratings of 7V support safe operation in circuits with significant voltage transients and emitter-referenced control topologies.
The device exhibits fT = 50MHz at IC = 10mA/VCE = 20V, enabling use in medium-frequency switching applications up to ~10MHz practical duty-cycle operation. Cobo = 6pF at VCB = 20V ensures low capacitive loading in gate-drive or feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 300V - enables safe operation with 240VAC-derived rails plus safety margin |
| VCEO | 300V - supports primary-side switching in offline flyback and forward converters |
| IC (cont.) | 500mA - sufficient for <10W isolated power stages with proper heatsinking |
| RθJA | 125°C/W - requires ≥15mm×15mm 1oz copper pad for full 1W dissipation at TA = 25°C |
| hFE | 25–40 - provides predictable base drive requirements across 1–30mA collector loads |
| VCE(sat) | ≤0.5V @ IC = 20mA/IB = 2mA - limits conduction loss in saturated-switching mode |
| fT | 50MHz - supports stable small-signal amplification and medium-speed switching |
Pinout & Package
Package: SOT89 - surface-mount, 3-terminal plastic molded case with exposed collector tab for thermal conduction and mechanical anchoring. UL 94V-0 rated, 0.052g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink terminal | Exposed metal tab - must be connected to ground or low-impedance heat path for thermal management |
| Emitter (E) | Current source reference node | Common return path; ties to system ground or negative rail in high-side switch configurations |
| Base (B) | Control input for current gain | Receives low-current drive (e.g., 2mA) to saturate 20mA collector load; requires series resistor for current limiting |
Key Features
| Feature | Design Value |
|---|---|
| High BVCEO | 300V rating allows direct use on 230VAC rectified bus without cascading or snubbing |
| Thermal performance | 125°C/W RθJA enables 1W operation on standard FR-4 PCB with minimal copper area |
| Green compliance | Halogen- and antimony-free, RoHS 3 compliant - meets automotive and industrial environmental mandates |
| Stable hFE | 25–40 range across 1–30mA ensures consistent base drive design across production lots |
Applications
| Industrial Flyback Power Supply | LED Driver for High-Voltage AC Input |
|---|---|
Use Scenario: Primary-side switching transistor in 5–12W offline flyback converter powering industrial sensors. IC Role / Device Role / Timing Role: NPN switch controlling energy transfer from primary winding; driven by UC3842-type controller. Use Value: 300V BVCEO eliminates need for voltage clamping network; 500mA IC supports peak currents up to 1.2A with derating. | Use Scenario: Constant-current switch in non-isolated LED driver fed from 230VAC rectified input. IC Role / Device Role / Timing Role: Linear or PWM-controlled current regulator operating in active region or saturation. Use Value: Low VCE(sat) (≤0.5V) minimizes power loss at 350mA LED current; SOT89 footprint simplifies thermal layout. |
| DC-DC Boost Converter Stage | High-Voltage Signal Amplifier |
Use Scenario: Switching element in 24V-to-200V boost converter for plasma ignition modules. IC Role / Device Role / Timing Role: High-voltage NPN switch synchronizing with external MOSFET gate driver timing. Use Value: 300V VCBO withstands inductive kickback during turn-off; fT = 50MHz supports clean edge transitions at 100kHz switching. | Use Scenario: Medium-gain amplifier stage in HV sensor signal conditioning for motor phase monitoring. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier biased at VCE = 150V, IC = 5mA for analog signal scaling. Use Value: Stable hFE across temperature ensures ±5% gain accuracy; 150°C max TJ supports under-hood deployment. |
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 |
|---|---|---|---|
| ZTX653 | BVCEO = 300V, IC = 1A, RθJA = 100°C/W, SOT89 package | Higher current rating but larger die size increases capacitance (Cobo = 12pF) | Preferred when >500mA peak current or lower thermal resistance is required; verify layout clearance for higher Cobo |
| MJD112 | BVCEO = 100V, IC = 2A, TO-252 package, hFE = 1000–3000 | Lower voltage rating; unsuitable for >120V applications without external protection | Only viable in low-voltage DC-DC or linear regulator contexts; not a drop-in replacement for 300V operation |
Compared with ZTX653 and MJD112, SXTA42TA offers optimal balance of 300V capability, SOT89 compactness, and predictable hFE for cost-sensitive industrial power designs where 500mA and 1W dissipation meet target specs.
Availability
SXTA42TA is available at Aetrix Electronics and suitable for industrial flyback power supplies, high-voltage LED drivers, DC-DC boost converters, and HV signal amplifiers requiring stable component supply and long-term manufacturability.
Supply support for SXTA42TA 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, manufacturing, and sales operations across Asia, Europe, and the Americas.
SXTA42TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching and amplification in industrial power conversion, lighting, and sensing systems operating up to 300V.
FAQ
What is the maximum allowable collector-emitter voltage for continuous operation?
The SXTA42TA has a guaranteed minimum BVCEO of 300V at IC = 1mA under pulsed conditions. For continuous DC operation, design must respect derated voltage limits per application-specific safety standards (e.g., IEC 62368-1), typically applying 50–70% of 300V depending on creepage, clearance, and transient immunity requirements.
Can SXTA42TA be used in automotive applications?
SXTA42TA itself is not AEC-Q101 qualified. Diodes states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing - users must contact Diodes directly to obtain qualified equivalents such as the AEC-Q101-compliant SXTA42Q series if targeting automotive use.
How should the exposed collector tab be connected on the PCB?
The exposed collector tab in the SOT89 package must be soldered to a dedicated copper pour tied to the collector net. This pad serves both electrical connection and thermal conduction; minimum recommended area is 15mm × 15mm of 1oz copper to achieve the specified RθJA = 125°C/W under still-air conditions.
Is SXTA42TA compatible with lead-free reflow profiles?
Yes - SXTA42TA is fully RoHS 3 compliant with matte tin-plated leads and qualifies for standard JEDEC J-STD-020 Level 1 moisture sensitivity. It supports peak reflow temperatures up to 260°C and is compatible with Pb-free SAC305 solder profiles without preconditioning.
SXTA42TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 30mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
SXTA42TA FAQ
1.How can I place an order for SXTA42TA through Aetrix?
Please submit a Request for Quotation (RFQ) for SXTA42TA 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 SXTA42TA reliable?
The price and inventory of SXTA42TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SXTA42TA is usually 5 days.
3.What payment methods are accepted for SXTA42TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SXTA42TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SXTA42TA?
SXTA42TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SXTA42TA 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 SXTA42TA?
For technical support, including SXTA42TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SXTA42TA requirements.
6.How does Aetrix verify that SXTA42TA is sourced from the original manufacturer or authorized distributors?
All SXTA42TA 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 SXTA42TA meets industry standards.
7.What is the process for return or replacement of SXTA42TA?
All SXTA42TA units undergo pre-shipment inspection (PSI). If there is an issue with SXTA42TA, 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 SXTA42TA part is unused and in its original packaging.
Return procedure for SXTA42TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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