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STMicroelectronics STTH512FP
- Part No.:
- STTH512FP
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack, Isolated Tab
- Datasheet:
-
STTH512FP.pdf
- Description:
- DIODE GP 1.2KV 5A TO220FPAC
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
STTH512FP from STMicroelectronics is a 1200 V, 5 A ultrafast recovery diode in insulated TO-220FPAC package, featuring 48 ns typical reverse recovery time (trr), 1.25 V typical forward voltage (VF) at 125 °C, and operation up to 175 °C junction temperature. It delivers soft recovery, low conduction/switching losses, and high pulsed current capability (60 A IFRM), making it suitable for freewheeling and snubber functions in industrial SMPS and motor control rectifiers.
For engineers reviewing the STTH512FP datasheet, STTH512FP pinout, STTH512FP application, or STTH512FP equivalent, key selection criteria include reverse recovery softness factor (S = 2), 2000 VRMS insulation rating, thermal resistance Rth(j-c) = 5.8 °C/W, and ECOPACK2 compliance for environmentally constrained designs.
Technical Context
This diode employs optimized silicon epitaxial structure and precise lifetime control to achieve ultrafast trr with soft recovery-critical for minimizing EMI and voltage overshoot in hard-switched topologies. Its low IR leakage (<5 µA at 25 °C, <30 µA at 125 °C) ensures stable thermal behavior under high ambient conditions.
The TO-220FPAC package provides electrical isolation between the cathode tab and mounting surface, enabling direct heatsink attachment without insulating washers. Thermal performance is characterized by Rth(j-c) = 5.8 °C/W and Tj(max) = 175 °C, supporting continuous operation in compact, high-power-density systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - Withstands repetitive reverse voltage up to 1200 V, enabling use in 800 V DC bus systems with safety margin. |
| IF(AV) | 5 A - Average forward current rating at TL = 105 °C, defining continuous rectification capability in thermally constrained layouts. |
| trr(typ.) | 48 ns - Measured at IF = 5 A, dIF/dt = −200 A/µs, VR = 600 V; enables >100 kHz switching in PFC and output stages. |
| VF(typ.) | 1.25 V - Forward voltage drop at IF = 5 A and Tj = 150 °C; directly determines conduction loss (P ≈ 1.5×IF(AV) + 0.08×IF²(RMS)). |
| S factor | 2 - Softness factor defined as tb/ta; reduces di/dt-induced voltage spikes and EMI during turn-off. |
| Rth(j-c) | 5.8 °C/W - Junction-to-case thermal resistance in TO-220FPAC; sets minimum heatsink requirement for thermal management. |
| Insulation | 2000 VRMS - Isolation rating between cathode tab and case, allowing safe mounting on grounded heatsinks. |
Pinout & Package
STTH512FP uses the insulated TO-220FPAC package: cathode-connected metal tab electrically isolated from the mounting surface, with three leads-Anode (pin 1), Cathode (pin 2), and isolated tab (cathode potential, non-electrical connection point). The package meets UL 94 V0 flammability rating and supports 0.55 N·m recommended mounting torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to AC input or switch node; must withstand peak reverse voltage and surge current (IFSM = 55 A). |
| Cathode (Pin 2) | Forward current exit / high-side reference | Electrically tied to isolated metal tab; serves as output node in freewheeling paths and snubbers. |
| Isolated Tab | Cathode potential, thermally conductive surface | Provides mechanical mounting and heat transfer path while maintaining 2000 VRMS isolation from heatsink ground. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast soft recovery | trr = 48 ns with S factor = 2 ensures low EMI and reduced voltage overshoot in hard-switched converters. |
| High-temperature operation | Tj(max) = 175 °C enables reliable use in sealed enclosures or high-ambient environments without derating. |
| Low leakage guard band | IR < 30 µA at 125 °C minimizes thermal runaway risk in parallel configurations and high-voltage hold circuits. |
| ECOPACK2 compliance | Meets RoHS, halogen-free, and material declaration requirements for industrial and server-grade applications. |
| Insulated TO-220FPAC | 2000 VRMS isolation eliminates need for mica washers or silicone pads, simplifying thermal interface design. |
Applications
| UPS Output Rectification | Server PSU PFC Stage |
|---|---|
|
Use Scenario: High-efficiency 3.3 kW online UPS with dual-phase interleaved boost PFC and IGBT-based inverter stage. IC Role / Device Role / Timing Role: Freewheeling diode across boost inductor, conducting during MOSFET/IGBT off-time with minimal reverse recovery stress. Use Value: 48 ns trr and soft recovery reduce switching losses and EMI filter size; 175 °C rating supports fanless operation. |
Use Scenario: 1U 1600 W redundant server power supply operating at 100–200 kHz with active clamp forward topology. IC Role / Device Role / Timing Role: Output rectifier handling 5 A average current and 60 A peak pulsed current during transient load steps. Use Value: Low VF(150 °C) = 1.25 V cuts conduction loss by ~18% vs. standard FRD; insulated tab enables direct heatsink mounting. |
| Motor Drive Snubber Network | Industrial SMPS Demagnetization |
|
Use Scenario: 7.5 kW servo drive with SiC MOSFET half-bridge and RC-RL snubber across each switch. IC Role / Device Role / Timing Role: Snubber diode clamping inductive kickback during fast turn-off, absorbing Qrr energy without oscillation. Use Value: S factor = 2 prevents snap-off and secondary breakdown; 2000 VRMS isolation allows direct PCB-mount heatsinking. |
Use Scenario: 24 V/20 A industrial auxiliary supply using flyback converter with primary-side demagnetization sensing. IC Role / Device Role / Timing Role: Demagnetization diode conducting during transformer reset phase, requiring fast turn-on and low reverse recovery charge. Use Value: Qrr = 960 nC at VR = 600 V ensures predictable reset timing and limits core loss; 175 °C rating sustains reliability over 10-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast recovery diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH812D | 8 A IF(AV), same VRRM (1200 V), trr = 50 ns, TO-220AC (non-insulated) | Requires insulating hardware for heatsink mounting; higher current rating suits larger PSUs but increases Qrr (1200 nC) | Select when higher average current is needed and isolation is managed externally via washer/pad. |
| IXYS MUR5120CT | 5 A IF(AV), 1200 V VRRM, trr = 65 ns, TO-247AC, non-insulated, VF = 1.35 V @ 125 °C | Larger package footprint; slower recovery and higher VF increase conduction/switching losses in high-frequency designs | Use only where board space permits TO-247 and thermal margin accommodates higher VF and trr penalties. |
Compared with STTH812D and MUR5120CT, STTH512FP uniquely combines 5 A rating, 48 ns trr, soft recovery (S = 2), and integrated 2000 VRMS isolation-enabling simplified thermal design and lower EMI in space-constrained, high-reliability industrial power supplies.
Availability
STTH512FP is available at Aetrix Electronics and suitable for UPS output rectification, server power supply PFC stages, and industrial motor control snubber networks requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for STTH512FP 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
STTH512FP belongs to ST's high-voltage ultrafast diode product line, engineered specifically for high-efficiency, high-reliability power conversion in mission-critical industrial and computing infrastructure.
FAQ
What is the maximum allowable mounting torque for STTH512FP?
The recommended torque value for STTH512FP's TO-220FPAC package is 0.55 N·m, with a maximum allowable torque of 0.70 N·m. Exceeding this may damage the internal bond wires or compromise the insulation integrity between the cathode tab and case. Proper torque ensures optimal thermal contact without mechanical overstress.
Can STTH512FP be used in parallel configurations?
Yes, STTH512FP supports parallel operation due to its tightly controlled VF matching and low IR leakage (<30 µA at 125 °C), which minimizes current imbalance and thermal runaway risk. However, matched layout symmetry, identical thermal paths, and external ballasting resistors are recommended for >2 devices in parallel.
How does the softness factor affect EMI performance?
A softness factor (S) of 2 means the reverse recovery current decays gradually (tb/ta = 2), reducing di/dt-induced voltage spikes across stray inductance. This directly lowers broadband conducted EMI and eases filtering requirements compared to snap-recovery diodes (S < 1), especially in >100 kHz SMPS designs.
Is STTH512FP suitable for use with SiC MOSFETs?
Yes-its 48 ns trr, soft recovery, and low Qrr (960 nC) make STTH512FP compatible with SiC MOSFETs in high-frequency PFC and DC-DC stages. It avoids excessive voltage overshoot during SiC turn-off and maintains efficiency without requiring complex gate drive tuning or snubbers.
STTH512FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1200 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 2.2 V @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 95 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FPAC
- Operating Temperature - Junction:
- 175°C (Max)
STTH512FP FAQ
1.How can I place an order for STTH512FP through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH512FP 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 STTH512FP reliable?
The price and inventory of STTH512FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH512FP is usually 5 days.
3.What payment methods are accepted for STTH512FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH512FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH512FP?
STTH512FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH512FP 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 STTH512FP?
For technical support, including STTH512FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH512FP requirements.
6.How does Aetrix verify that STTH512FP is sourced from the original manufacturer or authorized distributors?
All STTH512FP 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 STTH512FP meets industry standards.
7.What is the process for return or replacement of STTH512FP?
All STTH512FP units undergo pre-shipment inspection (PSI). If there is an issue with STTH512FP, 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 STTH512FP part is unused and in its original packaging.
Return procedure for STTH512FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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