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STMicroelectronics FERD30M45D
- Part No.:
- FERD30M45D
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
FERD30M45D.pdf
- Description:
- DIODE FERD 45V 30A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,247
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Product details
Overview
FERD30M45D from STMicroelectronics is a field-effect rectifier diode in TO-220AC package, rated for 30 A average forward current and 45 V repetitive peak reverse voltage, with typ. 0.44 V forward voltage at 30 A and 125 °C junction temperature; designed for solar bypass junction boxes and high-frequency switch-mode power supplies.
For engineers reviewing the FERD30M45D datasheet, FERD30M45D pinout, FERD30M45D application, or FERD30M45D equivalent, key selection criteria include low conduction loss (VF ≤ 0.49 V max at 30 A/125 °C), stable IR ≤ 100 µA at 125 °C/VRRM, thermal resistance Rth(j-c) = 1.05 °C/W, and operation up to 200 °C in DC forward mode without reverse bias.
Technical Context
This device uses ST's proprietary field-effect rectifier process to suppress leakage current drift across full reverse voltage range (0–45 V), unlike conventional Schottky or PN diodes. Its low VF and high Tj capability enable compact thermal design in solar bypass strings where ambient temperatures exceed 100 °C.
It operates without avalanche breakdown risk under repetitive 45 V reverse stress and sustains 250 A non-repetitive surge (10 ms sinusoidal), making it suitable for transient-heavy PV module protection circuits where fast recovery and minimal stored charge are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 30 A - supports continuous solar string bypass current without derating at TC = 150 °C |
| VRRM | 45 V - withstands worst-case reverse voltage in 36 V nominal PV systems with margin |
| VF (typ.) | 0.44 V @ 30 A, 125 °C - reduces conduction loss to ~13 W vs. >20 W for standard Schottky alternatives |
| IR (max) | 100 µA @ 125 °C, VR = 45 V - ensures minimal power loss in hot, shaded bypass conditions |
| Rth(j-c) | 1.05 °C/W - enables direct heatsink mounting with predictable thermal rise under 30 A load |
| Tj (max) | 175 °C continuous, 200 °C short-term - allows operation in sealed junction boxes with limited airflow |
| IFSM | 250 A @ 10 ms - handles lightning-induced surges in rooftop PV arrays |
Pinout & Package
Packaged in TO-220AC: isolated metal tab (cathode), two leads - anode (pin 1), cathode (pin 2). Metal tab is electrically connected to cathode and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (lead) | Forward current entry point | Connected to PV cell string positive; must be routed with low-inductance trace for high-frequency SMPS use |
| Cathode (lead) | Forward current exit / reverse blocking terminal | Electrically tied to metal tab; requires insulated mounting when heatsink is grounded |
| Metal tab | Cathode terminal & thermal interface | Provides <1.1 °C/W thermal path to heatsink; torque spec: 0.55 N·m (max 0.7 N·m) |
Key Features
| Feature | Design Value |
|---|---|
| Stable IR over full VRRM range | Leakage remains ≤100 µA from 0 to 45 V reverse bias at 125 °C - prevents thermal runaway in parallel-connected bypass diodes |
| Low VF at high Tj | 0.44 V typ. @ 30 A/125 °C - cuts conduction loss by ≥35% vs. standard 45 V Schottky diodes at same condition |
| High Tj operation | Rated for 200 °C junction temperature in DC forward mode - supports reliability in unventilated solar enclosures |
| TO-220AC mechanical robustness | Epoxy meets UL94 V0; 1.86 g mass; 0.55 N·m recommended mounting torque - ensures long-term mechanical integrity in vibration-prone rooftop mounts |
Applications
| Solar Bypass Junction Box | High-Frequency SMPS Output Rectification |
|---|---|
Use Scenario: Installed across individual PV cell substrings to prevent hot-spot damage during partial shading. IC Role / Device Role / Timing Role: Field-effect rectifier providing low-loss, thermally stable bypass path during reverse bias. Use Value: Stable 100 µA leakage at 125 °C avoids cumulative heating in multi-diode parallel configurations, extending junction box lifetime beyond 25 years. | Use Scenario: Secondary-side rectifier in 100–500 kHz flyback or LLC resonant converters for industrial power supplies. IC Role / Device Role / Timing Role: High-frequency rectifier with minimal stored charge and fast switching transition. Use Value: 0.44 V VF at 30 A reduces output stage loss by ≥2.5 W vs. comparable Schottky, enabling higher efficiency at full load without forced air cooling. |
| DC Optimizer Input Protection | Telecom -48 V Backup Power Rectification |
Use Scenario: Reverse-polarity and overvoltage protection at input of module-level DC optimizers in commercial PV arrays. IC Role / Device Role / Timing Role: Unidirectional field-effect rectifier clamping reverse current while sustaining 45 V system transients. Use Value: 250 A IFSM rating absorbs 10 ms line surges per IEEE 1637, eliminating need for external TVS in cost-sensitive optimizer designs. | Use Scenario: OR-ing diode in redundant -48 V telecom backup power feeds feeding distributed base station equipment. IC Role / Device Role / Timing Role: Low-VF, high-Tj rectifier ensuring minimal voltage drop and reliable operation in sealed outdoor cabinets. Use Value: 175 °C continuous rating maintains <0.5 V drop at 30 A even at ambient 85 °C, preserving system headroom for battery float charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar field-effect rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-30CPH045 | Same 45 V VRRM, but 0.52 V VF @ 30 A/125 °C; Rth(j-c) = 1.25 °C/W | Higher conduction loss limits use in high-density solar junction boxes above 75 °C ambient | Select only if legacy Vishay footprint compatibility required and thermal margin ≥15 °C exists |
| ON Semiconductor MBR3045CT | Standard Schottky; 0.55 V VF @ 30 A/25 °C, but IR = 1.2 mA @ 125 °C/VRRM | Unstable leakage causes thermal runaway risk in multi-diode parallel solar bypass | Avoid in PV bypass; acceptable only in low-temp, low-current SMPS where IR drift is non-critical |
Compared with VS-30CPH045 and MBR3045CT, FERD30M45D uniquely delivers sub-0.45 V VF *and* sub-100 µA IR at 125 °C, enabling higher power density and longer lifetime in thermally constrained solar and telecom rectification.
Availability
FERD30M45D is available at Aetrix Electronics and suitable for solar bypass junction boxes, high-frequency switch-mode power supplies, DC optimizer input protection, and telecom -48 V backup power rectification requiring stable component supply and long-lifecycle support.
Supply support for FERD30M45D 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and energy applications.
FERD30M45D belongs to ST's Field-Effect Rectifier (FERD) product line, engineered specifically to replace Schottky diodes in high-temperature, high-reliability photovoltaic and power conversion systems where leakage stability is mission-critical.
FAQ
Is FERD30M45D a Schottky diode?
No. FERD30M45D is a field-effect rectifier - a patented ST structure combining MOS-gated control with PN junction conduction. It exhibits Schottky-like low VF but with PN-like temperature-stable leakage, unlike true Schottky diodes whose IR increases exponentially with temperature.
Can FERD30M45D be used in place of a standard 45 V Schottky in a flyback converter?
Yes, with design verification: its lower VF reduces conduction loss, but its gate-controlled turn-on requires no snubber in most cases. However, layout must ensure cathode tab isolation if heatsink is grounded, and thermal design must account for 1.05 °C/W Rth(j-c) versus typical Schottky's 1.3–1.5 °C/W.
What is the maximum continuous case temperature for FERD30M45D?
The datasheet specifies IF(AV) = 30 A at TC = 150 °C. With Rth(j-c) = 1.05 °C/W and Tj(max) = 175 °C, the maximum sustainable case temperature is 144.5 °C (175 − 30 × 1.05). Operation above this requires derating or active cooling.
Does FERD30M45D require a gate drive circuit?
No. The device is a two-terminal passive rectifier: anode and cathode only. Its "field-effect" behavior is internally integrated via MOS-controlled carrier injection - no external gate connection or biasing is needed or possible.
FERD30M45D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK®
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- FERD (Field Effect Rectifier Diode)
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 30A
- Voltage - Forward (Vf) (Max) @ If:
- 420 mV @ 15 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1.2 mA @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- 175°C (Max)
FERD30M45D FAQ
1.How can I place an order for FERD30M45D through Aetrix?
Please submit a Request for Quotation (RFQ) for FERD30M45D 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 FERD30M45D reliable?
The price and inventory of FERD30M45D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FERD30M45D is usually 5 days.
3.What payment methods are accepted for FERD30M45D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FERD30M45D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FERD30M45D?
FERD30M45D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FERD30M45D 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 FERD30M45D?
For technical support, including FERD30M45D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FERD30M45D requirements.
6.How does Aetrix verify that FERD30M45D is sourced from the original manufacturer or authorized distributors?
All FERD30M45D 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 FERD30M45D meets industry standards.
7.What is the process for return or replacement of FERD30M45D?
All FERD30M45D units undergo pre-shipment inspection (PSI). If there is an issue with FERD30M45D, 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 FERD30M45D part is unused and in its original packaging.
Return procedure for FERD30M45D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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