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STMicroelectronics STC03DE170
- Part No.:
- STC03DE170
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose
- Package:
- TO-247-4
- Datasheet:
-
STC03DE170.pdf
- Description:
- TRANS ESBT 1700V 3A TO-247-4L
- Quantity:
- Payment:
- Shipping:
Inventory:2,014
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Product details
Overview
STC03DE170 from STMicroelectronics is a hybrid Emitter-Switched Bipolar Transistor (ESBT™) designed for high-voltage auxiliary flyback SMPS in three-phase mains systems. It features 1700 V VCS(SS), 3 A IC, 0.55 Ω RCS(ON), 750 pF Ciss, and operates up to 150 kHz switching frequency.
For engineers reviewing the STC03DE170 datasheet, STC03DE170 pinout, STC03DE170 application, or STC03DE170 equivalent, key selection criteria include its squared RBSOA up to 1700 V, low gate charge (12.5 nC), fast switching (14 ns tf), and dedicated hybrid structure enabling robust operation in unclamped inductive loads without snubber.
Technical Context
The STC03DE170 integrates a high-voltage bipolar transistor with a low-voltage MOSFET in a single TO-247-4L package, where the MOSFET drives the bipolar emitter to achieve low conduction loss and fast turn-off. Its ESBT topology delivers superior safe operating area (RBSOA) versus conventional IGBTs or MOSFETs at 1700 V class.
It requires external gate drive at VGS = ±20 V, uses base-source voltage control (VBS(OS) = 30 V), and exhibits hFE = 3.5–10 under specified bias conditions. Dynamic saturation voltage remains below 3.9 V at 500 ns, supporting reliable hard-switching in auxiliary power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCS(SS) | 1700 V - Enables direct use in 3-phase rectified bus-derived aux supplies without voltage derating. |
| IC | 3 A continuous - Supports ≥15 W auxiliary output at 12–24 V with margin for peak loading. |
| RCS(ON) | 0.55 Ω - Delivers low conduction loss (<1.8 W at 1.8 A) in flyback primary switch position. |
| Ciss | 750 pF @ 25 V - Enables efficient 150 kHz operation with 4.7 Ω gate resistor and minimal drive power. |
| QGS(tot) | 12.5 nC - Reduces gate driver power dissipation and simplifies isolated gate drive design. |
| tf | 14 ns @ IC = 1.8 A - Minimizes switching loss during turn-off in unclamped inductive transitions. |
| hFE | 3.5–10 - Defines required base current drive (0.36 A typical at 1.8 A collector) for saturation control. |
Pinout & Package
STC03DE170 is housed in a TO-247-4L package with four terminals: Collector (C), Emitter (E), Base (B), and Gate (G). The fourth pin enables separate gate and emitter connection for precise drive loop control and reduced Miller feedback.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Collector) | High-voltage main current path | Connects to primary winding of flyback transformer; rated for 1700 V blocking and 3 A conduction. |
| Pin 2 (Emitter) | Emitter reference for bipolar section | Common return node for both bipolar emitter and MOSFET source; used for Kelvin sense in gate drive layout. |
| Pin 3 (Base) | Control input for bipolar transistor | Drives base current (up to 2 A) to saturate the HV bipolar; requires low-inductance path for fast turn-on. |
| Pin 4 (Gate) | Control input for integrated MOSFET | Standard MOS gate (±20 V rating); controls emitter-switching action and defines overall switching speed. |
Key Features
| Feature | Design Value |
|---|---|
| Squared RBSOA up to 1700 V | Enables reliable operation in unclamped inductive switching without snubber networks in flyback topologies. |
| Very low Ciss (750 pF) | Reduces gate drive power and allows stable 150 kHz operation with standard 4.7 Ω gate resistor. |
| Hybrid ESBT™ structure | Combines MOSFET gate control with bipolar conduction to achieve lower RCS(ON) than comparable 1700 V MOSFETs. |
| Fast fall time (14 ns) | Minimizes switching loss during turn-off, critical for efficiency in high-frequency auxiliary SMPS. |
| Separate gate and emitter pins | Supports Kelvin-connected gate drive to suppress Miller-induced false turn-on in high-dV/dt environments. |
Applications
| Industrial 3-Phase Auxiliary Power Supply | Motor Drive Control Logic Power |
|---|---|
Use Scenario: Provides isolated 15–24 V auxiliary power from rectified 3-phase 400–690 V AC mains in variable frequency drives. IC Role / Device Role / Timing Role: Primary-side high-voltage switch in flyback converter; operates at fixed 100–150 kHz with self-oscillating or PWM-controlled gate drive. Use Value: Eliminates need for snubber circuitry due to squared RBSOA, reducing component count and board space by ~30% vs. IGBT-based alternatives. | Use Scenario: Powers gate drivers, microcontrollers, and isolation interfaces in industrial motor inverters requiring high reliability across wide temperature range. IC Role / Device Role / Timing Role: Emitter-switched bipolar transistor acting as primary switch; leverages low RCS(ON) and fast tf to maintain efficiency at partial load. Use Value: Achieves <1.8 W conduction loss at 1.8 A, enabling natural convection cooling in compact drive enclosures. |
| PLC Backplane Power Module | Renewable Energy System Auxiliary Supply |
Use Scenario: Generates 5 V/3.3 V logic rails for programmable logic controller backplanes fed from 3-phase distribution bus. IC Role / Device Role / Timing Role: High-voltage flyback switch with integrated bipolar-MOS hybrid control; driven by dedicated gate driver IC (e.g., STGAP2S). Use Value: Maintains stable output regulation over ±15% input variation (560–720 V DC) due to tight VCS(ON) tolerance (1.0–1.5 V). | Use Scenario: Supplies control electronics in solar string inverters and wind turbine converters where auxiliary power must survive grid fault transients. IC Role / Device Role / Timing Role: Primary switch in reinforced-isolation flyback; withstands 1700 V transient overvoltage per IEC 61000-4-5 Level 4. Use Value: Survives repeated 1200 V clamped inductive spikes (tp = 4 ms) without degradation, verified per Figure 3 RBSOA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage flyback switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STGW30H65DFB | 650 V IGBT with FRD; higher VCE(sat) (1.8 V), slower tf (150 ns), no base/gate separation. | Limited to ≤600 V DC bus; requires snubber for same RBSOA performance. | Choose only if system DC bus is ≤650 V and cost sensitivity outweighs efficiency and layout simplicity. |
| IXTH3N170D2 | 1700 V SiC MOSFET; zero gate charge, 10× lower Ciss, but requires negative gate bias and higher drive voltage. | Enables >300 kHz operation but demands redesigned gate driver and layout for dV/dt immunity. | Select when upgrading to SiC for higher frequency or efficiency targets; not drop-in compatible. |
Compared with STGW30H65DFB and IXTH3N170D2, the STC03DE170 uniquely balances 1700 V capability, low drive complexity, and snubberless operation-making it optimal for cost-sensitive, space-constrained 3-phase auxiliary SMPS where 100–150 kHz is sufficient.
Availability
STC03DE170 is available at Aetrix Electronics and suitable for industrial motor drives, PLC power modules, renewable energy auxiliary supplies, and three-phase UPS control circuits requiring stable component supply and long-term design continuity.
Supply support for STC03DE170 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive ICs.
The STC03DE170 belongs to ST's ESBT™ product line, engineered specifically for high-reliability auxiliary power conversion in industrial three-phase equipment where snubberless operation and 1700 V ruggedness are mandatory.
FAQ
What is the recommended gate resistor value for STC03DE170?
The datasheet specifies RG = 4.7 Ω for optimized switching speed and EMI control. At this value, measured tf is 14 ns and ts is 760 ns under 1.8 A load. Increasing RG beyond 10 Ω significantly degrades switching speed and increases dynamic losses, while values below 2.2 Ω risk excessive gate current overshoot and driver stress.
Can STC03DE170 be used in hard-switched forward converters?
No-STC03DE170 is qualified and characterized exclusively for flyback topology with unclamped inductive loads. Its squared RBSOA and dynamic voltage ratings (e.g., VCSW = 1500 V) are validated only under flyback conditions. Forward converter operation would exceed safe operating limits due to simultaneous voltage and current stress during reset.
Does STC03DE170 require negative gate voltage for turn-off?
No. The device uses positive-only gate drive: VGS = 0 V turns off the MOSFET section, which removes base drive from the bipolar transistor. The datasheet confirms stable turn-off with VGS = 0 V and no requirement for negative bias, simplifying gate driver design versus standard IGBTs.
Is STC03DE170 still in active production?
STC03DE170 is marked "Obsolete Product(s)" in the official ST datasheet revision history (Rev. 2, Oct 2004). However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support-including obsolescence mitigation planning and cross-reference guidance-for industrial customers continuing to manufacture with this qualified component.
STC03DE170 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ESBT®
- Package/Case:
- TO-247-4
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Emitter Switched Bipolar
- Applications:
- Gate Driver
- Voltage - Rated:
- 1700V (1.7kV)
- Current Rating (Amps):
- 3A
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-247-4L
STC03DE170 FAQ
1.How can I place an order for STC03DE170 through Aetrix?
Please submit a Request for Quotation (RFQ) for STC03DE170 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 STC03DE170 reliable?
The price and inventory of STC03DE170 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STC03DE170 is usually 5 days.
3.What payment methods are accepted for STC03DE170?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STC03DE170 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STC03DE170?
STC03DE170 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STC03DE170 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 STC03DE170?
For technical support, including STC03DE170 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STC03DE170 requirements.
6.How does Aetrix verify that STC03DE170 is sourced from the original manufacturer or authorized distributors?
All STC03DE170 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 STC03DE170 meets industry standards.
7.What is the process for return or replacement of STC03DE170?
All STC03DE170 units undergo pre-shipment inspection (PSI). If there is an issue with STC03DE170, 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 STC03DE170 part is unused and in its original packaging.
Return procedure for STC03DE170:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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