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STMicroelectronics STTA112U
- Part No.:
- STTA112U
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
STTA112U.pdf
- Description:
- DIODE GEN PURP 1.2KV 1A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,891
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Product details
Overview
STTA112U from STMicroelectronics is an ultra-fast, soft-recovery 1200 V high-voltage diode in SMB package, rated for 1 A average forward current and 65 ns typical reverse recovery time (trr), with 1.5 V max forward voltage at 1 A and 25 °C. It serves as a snubber, clamping, demagnetization, or high-voltage rectifier diode in IGBT/MOSFET freewheel paths, particularly in motor control and SMPS primary/secondary stages.
For engineers reviewing the STTA112U datasheet, STTA112U pinout, STTA112U application, or STTA112U equivalent, key selection criteria include softness factor (S = 0.7 typ), low dynamic losses (Rd = 350 mΩ), junction-to-lead thermal resistance (23 °C/W), and validated performance under dIF/dt up to –50 A/µs at 125 °C.
Technical Context
The STTA112U employs optimized silicon design for ultra-fast turn-off with soft recovery (S = 0.7), minimizing voltage overshoot and EMI during commutation. Its low trr (65 ns typ) and controlled IRM (5 A max at 125 °C, VR = 600 V) enable stable operation in high-frequency switching circuits where diode-induced transistor stress must be suppressed.
It delivers low conduction loss via threshold voltage (Vto = 1.15 V) and dynamic resistance (Rd = 350 mΩ), enabling accurate power loss calculation using P = Vto × IF(AV) + Rd × IF²(RMS). Reverse leakage remains tightly bounded (≤300 µA at 125 °C, VR = 960 V), supporting reliable high-temperature operation up to Tj = 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - Withstands repetitive reverse voltage up to 1200 V without breakdown, suitable for 800 V DC bus applications with margin. |
| IF(AV) | 1 A - Continuous average forward current rating at Tlead = 93 °C, defining steady-state conduction capability. |
| trr (typ) | 65 ns - Typical reverse recovery time at IF = 0.5 A, IR = 1 A, dIF/dt = –50 A/µs, directly limiting minimum switching frequency and EMI generation. |
| VF (max) | 1.5 V - Maximum forward voltage at IF = 1 A and 25 °C, used to compute worst-case conduction loss in thermal design. |
| S factor | 0.7 - Softness factor (tb/ta) indicating dominant tail-current decay, reducing voltage spikes and gate-drive stress on companion transistors. |
| Rth(j-I) | 23 °C/W - Junction-to-lead thermal resistance, enabling direct calculation of junction temperature rise under known lead temperature and power dissipation. |
| IRM (max) | 5 A - Peak reverse recovery current at Tj = 125 °C, VR = 600 V, dIF/dt = –50 A/µs; critical for snubber sizing and IGBT turn-off loss estimation. |
Pinout & Package
STTA112U is housed in an SMB (DO-214AA) surface-mount package with cathode-indicated band marking. The device has two terminals: anode and cathode, with no internal gating or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch emitter/source or transformer secondary ground side) during conduction. |
| Cathode | Forward current exit point | Marked by band; connects to higher-potential node (e.g., IGBT collector, MOSFET drain, or SMPS output rail) and carries recovered charge during turn-off. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast soft recovery | S factor = 0.7 ensures gradual current decay, suppressing voltage ringing and reducing electromagnetic interference in high-dI/dt environments. |
| Low conduction loss architecture | Vto = 1.15 V and Rd = 350 mΩ enable precise, low-error power loss modeling for thermal management in compact designs. |
| High-temperature reliability | Rated for Tj = 125 °C continuous operation with IR ≤ 300 µA at 125 °C, supporting industrial motor drives and high-ambient SMPS. |
| Optimized for IGBT/MOSFET co-packaging | Trr = 65 ns and IRM = 5 A minimize induced turn-off losses in companion transistors, verified under dIF/dt = –50 A/µs conditions. |
Applications
| Motor Drive Freewheeling | SMPS Primary Snubber |
|---|---|
Use Scenario: Used across IGBT collector-emitter in three-phase inverter legs to recirculate inductive current during PWM off-time. IC Role / Device Role / Timing Role: Ultra-fast soft-recovery diode providing low-loss, low-noise freewheel path during transistor turn-off transitions. Use Value: Reduces IGBT turn-off losses by limiting peak recovery current (IRM ≤ 5 A) and voltage overshoot via S = 0.7 softness. | Use Scenario: Placed across flyback transformer primary winding with RC snubber network to clamp voltage spikes during MOSFET turn-off. IC Role / Device Role / Timing Role: High-voltage clamping diode absorbing stored inductive energy with minimal delay and overshoot. Use Value: Enables reliable 1200 V standoff while maintaining trr ≤ 65 ns to avoid delayed clamping that could damage the switching MOSFET. |
| SMPS Secondary Rectification | Inductive Load Demagnetization |
Use Scenario: Employed as output rectifier in high-voltage auxiliary or bias supplies of telecom or industrial SMPS operating above 600 V DC output. IC Role / Device Role / Timing Role: High-voltage, low-loss rectifier handling repetitive 1200 V reverse stress and delivering 1 A average output current. Use Value: Achieves <1.5 V VF at 1 A and 25 °C, lowering conduction loss versus standard fast recovery diodes in high-Vout topologies. | Use Scenario: Connected across relay coils, solenoids, or transformer windings to safely dissipate stored magnetic energy when drive is removed. IC Role / Device Role / Timing Role: Demagnetizing diode conducting reverse current with controlled soft recovery to prevent arcing and contact wear. Use Value: Soft recovery (S = 0.7) avoids sharp voltage reversal that causes contact bounce or insulation stress in electromechanical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast high-voltage diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L12 | Same VRRM (1200 V), but IF(AV) = 1.2 A and trr = 55 ns (typ); SMB package; slightly lower VF (1.45 V max). | Lower trr improves high-frequency snubber response; higher IF(AV) supports marginally higher average load current. | Select when tighter trr tolerance and extended current headroom are required in new designs. |
| ES1J | VRRM = 600 V only; IF(AV) = 1 A; trr = 35 ns (typ); same SMB package; VF = 1.7 V max. | Half the voltage rating limits use to ≤400 V DC bus applications; faster trr trades off voltage capability for speed. | Use only in lower-voltage, higher-frequency SMPS where 1200 V margin is unnecessary and cost sensitivity is high. |
Compared with STTH1L12, STTA112U offers higher softness (S = 0.7 vs ~0.5) for reduced EMI in noisy motor drives, while ES1J sacrifices voltage robustness for speed-making STTA112U optimal for 800–1000 V industrial systems demanding both ruggedness and controlled recovery.
Availability
STTA112U is available at Aetrix Electronics and suitable for motor control inverters, SMPS primary snubbers, high-voltage rectifiers, and inductive load demagnetization circuits requiring stable component supply and long-term industrial availability.
Supply support for STTA112U 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The TURBOSWITCH™ product line was engineered specifically for high-efficiency, low-EMI power conversion in IGBT/MOSFET-based systems-emphasizing soft recovery, ultra-fast switching, and thermal robustness in high-voltage applications.
FAQ
Is STTA112U suitable for use with 650 V SiC MOSFETs?
Yes. Its 1200 V VRRM provides sufficient margin against voltage transients in 650 V systems, and its soft recovery (S = 0.7) reduces gate oscillation and EMI coupling into sensitive SiC gate drivers during commutation events.
What is the maximum allowable PCB copper area for thermal relief at the cathode pad?
Per STMicroelectronics' SMB footprint recommendation, a minimum 10 mm² exposed copper pad (with thermal vias to inner ground planes) is advised. This supports the specified Rth(j-I) = 23 °C/W and enables safe operation at 1.4 W conduction loss with Tlead ≤ 93 °C.
Does STTA112U have a qualified AEC-Q101 rating for automotive use?
No. STTA112U is not AEC-Q101 qualified. It is intended for industrial and commercial applications. For automotive-grade equivalents, STMicroelectronics offers the STTH1R12-Y series, which undergoes full AEC-Q101 stress testing and qualification.
Can STTA112U replace a standard FR107 in a 1200 V flyback snubber?
Yes, with significant improvement. Unlike FR107 (trr ≈ 500 ns, no softness spec), STTA112U's 65 ns trr and S = 0.7 reduce snubber dissipation and voltage overshoot, enabling smaller RC components and improved system efficiency-provided layout accounts for its higher dI/dt sensitivity.
STTA112U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- TURBOSWITCH™
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.65 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 115 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- 125°C (Max)
STTA112U FAQ
1.How can I place an order for STTA112U through Aetrix?
Please submit a Request for Quotation (RFQ) for STTA112U 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 STTA112U reliable?
The price and inventory of STTA112U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTA112U is usually 5 days.
3.What payment methods are accepted for STTA112U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTA112U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTA112U?
STTA112U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTA112U 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 STTA112U?
For technical support, including STTA112U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTA112U requirements.
6.How does Aetrix verify that STTA112U is sourced from the original manufacturer or authorized distributors?
All STTA112U 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 STTA112U meets industry standards.
7.What is the process for return or replacement of STTA112U?
All STTA112U units undergo pre-shipment inspection (PSI). If there is an issue with STTA112U, 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 STTA112U part is unused and in its original packaging.
Return procedure for STTA112U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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