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STMicroelectronics FERD2045SB-TR
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- Part No.:
- FERD2045SB-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
FERD2045SB-TR.pdf
- Description:
- DIODE FERD 45V 20A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:8,665
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Product details
Overview
FERD2045SB-TR from STMicroelectronics is a 45 V field-effect rectifier diode in DPAK package, delivering 20 A average forward current, 0.29 V typical forward voltage at 125 °C/20 A, and stable 12 mA reverse leakage at 125 °C/35 V. It replaces low-voltage Schottky diodes in high-frequency DC-DC output rectification and synchronous buck freewheeling paths.
For engineers reviewing the FERD2045SB-TR datasheet, FERD2045SB-TR pinout, FERD2045SB-TR application, or FERD2045SB-TR equivalent, key selection criteria include VF/IR trade-off at elevated temperature, junction-to-case thermal resistance (1.4 °C/W), surge current rating (180 A), and DPAK thermal pad layout compatibility with FR4 PCB copper area.
Technical Context
This device uses ST's proprietary field-effect rectifier process to achieve superior forward voltage vs. reverse leakage balance-unlike conventional Schottky diodes, it avoids thermally induced runaway by maintaining stable IR across 25–150 °C. Its low VF (0.29–0.57 V) and high IF(AV) (20 A) enable high-efficiency operation in compact 12 V and 24 V power supplies.
The DPAK package provides direct thermal conduction via the exposed cathode tab, supporting junction temperatures up to 150 °C under sustained 20 A load when mounted on ≥90 cm² copper area. Static characteristics are specified with anode terminals shorted, confirming single-diode topology with no internal series resistor or integrated gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V maximum repetitive reverse voltage - sets safe operating limit for 36 V nominal input rails |
| IF(AV) | 20 A average forward current at TC = 125 °C - defines continuous DC output capability with heatsink |
| VF(typ.) | 0.29 V at Tj = 125 °C, IF = 20 A - enables <1.2 W conduction loss in 20 A output stage |
| IR(max) | 40 mA at Tj = 125 °C, VR = 35 V - ensures minimal standby power loss in offline adapters |
| Rth(j-c) | 1.4 °C/W - allows direct thermal path to heatsink without thermal interface material |
| IFSM | 180 A non-repetitive surge (10 ms sine) - withstands inrush and transient overloads |
| Tj(max) | 150 °C - supports operation in sealed industrial enclosures without forced air |
Pinout & Package
DPAK (TO-252) package with three terminals: anode (pin 1), cathode (exposed tab/pin 2), and auxiliary anode (pin 3). The cathode tab is electrically and thermally connected to pin 2 and must be soldered to ≥90 cm² copper pour for rated 20 A performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Main anode connection | Carries full forward current into device; routed as high-side node in buck freewheeling |
| Cathode (Tab/Pin 2) | Main cathode & thermal path | Electrically tied to PCB ground plane; primary heat dissipation surface |
| Auxiliary Anode (Pin 3) | Secondary anode terminal | Provides redundant anode connection for improved current sharing and bond wire reliability |
Key Features
| Feature | Design Value |
|---|---|
| ST advanced rectifier process | Enables VF/IR optimization unattainable with standard Schottky fabrication |
| Stable leakage over reverse voltage | IR remains ≤40 mA up to 35 V at 125 °C - prevents thermal runaway in hot environments |
| Low forward voltage drop | 0.29 V typ. at 20 A/125 °C - reduces conduction loss by ~35% vs. comparable Schottky diodes |
| High frequency operation | No minority carrier storage delay - supports >500 kHz switching in LLC and phase-shifted topologies |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy - meets IPC-1752A Class 2 reporting requirements |
Applications
| Server VRM Output Rectification | Industrial DC-DC Converter Freewheeling |
|---|---|
Use Scenario: 12 V/20 A point-of-load converter supplying CPU core voltage in rack-mounted servers. IC Role / Device Role / Timing Role: Main output rectifier replacing Schottky diode in synchronous buck secondary side. Use Value: 0.29 V VF at 125 °C cuts conduction loss by 0.8 W vs. legacy 45 V Schottky, reducing heatsink size by 30%. | Use Scenario: 24 V input to 5 V/15 A isolated flyback supply powering PLC I/O modules. IC Role / Device Role / Timing Role: Freewheeling diode across primary winding during MOSFET off-time. Use Value: 180 A IFSM withstands 10 ms surges from inductive kickback, eliminating need for snubber networks. |
| Telecom Power Shelf Rectification | Automotive ADAS Power Module |
Use Scenario: 48 V intermediate bus converter feeding 12 V/10 A subsystems in 5G base station cabinets. IC Role / Device Role / Timing Role: Secondary-side rectifier in half-bridge LLC resonant converter. Use Value: Stable IR ≤24 mA at 125 °C prevents thermal drift-induced efficiency collapse at full load and ambient 70 °C. | Use Scenario: 12 V/8 A buck converter powering radar sensor ECU in engine bay (Tamb up to 105 °C). IC Role / Device Role / Timing Role: Output rectifier in high-density power module with integrated MOSFET and controller. Use Value: Rth(j-c) = 1.4 °C/W enables direct mounting to aluminum chassis, eliminating discrete heatsink and saving 120 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar field-effect rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NRVB2045CT | 20 A dual common-cathode Schottky; VF = 0.52 V @ 20 A/125 °C; IR = 100 mA @ 125 °C/45 V | Higher conduction loss and thermal runaway risk above 100 °C ambient | Prefer where dual-diode configuration simplifies layout but derate IF(AV) to 14 A at 125 °C |
| Vishay VS-20E45-M3 | 20 A Schottky; VF = 0.49 V @ 20 A/125 °C; Rth(j-c) = 2.0 °C/W; no auxiliary anode | Lower thermal performance requires larger copper area; no redundancy for bond wire failure | Acceptable for lower-power 15 A designs with ≥150 cm² copper and no mission-critical reliability requirement |
Compared with NRVB2045CT and VS-20E45-M3, FERD2045SB-TR delivers 23% lower VF at full load and 60% lower IR at 125 °C, enabling higher power density and extended thermal margin in sealed enclosures without airflow.
Availability
FERD2045SB-TR is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, telecom power shelves, and automotive ADAS power modules requiring stable component supply with guaranteed long-term availability.
Supply support for FERD2045SB-TR 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
This device belongs to ST's Field-Effect Rectifier (FERD) product line, engineered specifically to displace Schottky diodes in high-current, high-temperature power conversion where VF/IR trade-off and thermal stability are critical.
FAQ
What is the recommended PCB footprint for FERD2045SB-TR?
The DPAK footprint must match ST's recommended outline: 4.95–5.46 mm wide cathode tab, 5.97–6.22 mm length, and ≥90 cm² copper area beneath the tab. Use 2 oz copper with thermal vias spaced ≤2 mm apart to achieve Rth(j-a) ≤ 10 °C/W in natural convection.
Does FERD2045SB-TR require a gate drive circuit?
No. FERD2045SB-TR is a passive uncontrolled rectifier diode with no gate terminal. It operates solely on forward bias voltage and does not require external control signals, drivers, or timing synchronization.
Can this diode replace a standard Schottky in existing designs?
Yes, with verification of thermal layout and reverse voltage margin. Its DPAK footprint is identical to industry-standard Schottky diodes, but its lower VF and stable IR allow immediate efficiency gain-especially in thermally constrained 125 °C junction environments.
What is the meaning of "B" in FERD2045SB-TR?
The "B" suffix denotes tape-and-reel packaging per ST's ordering code convention: FERD2045SB-TR ships in 2500-unit reels with EIA-481-compliant carrier tape, optimized for automated SMT placement.
FERD2045SB-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK®2
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- FERD (Field Effect Rectifier Diode)
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 20 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 600 µA @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
- Operating Temperature - Junction:
- -40°C ~ 150°C
FERD2045SB-TR FAQ
1.How can I place an order for FERD2045SB-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for FERD2045SB-TR 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 FERD2045SB-TR reliable?
The price and inventory of FERD2045SB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FERD2045SB-TR is usually 5 days.
3.What payment methods are accepted for FERD2045SB-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FERD2045SB-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FERD2045SB-TR?
FERD2045SB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FERD2045SB-TR 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 FERD2045SB-TR?
For technical support, including FERD2045SB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FERD2045SB-TR requirements.
6.How does Aetrix verify that FERD2045SB-TR is sourced from the original manufacturer or authorized distributors?
All FERD2045SB-TR 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 FERD2045SB-TR meets industry standards.
7.What is the process for return or replacement of FERD2045SB-TR?
All FERD2045SB-TR units undergo pre-shipment inspection (PSI). If there is an issue with FERD2045SB-TR, 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 FERD2045SB-TR part is unused and in its original packaging.
Return procedure for FERD2045SB-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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