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onsemi FDH400TR
- Part No.:
- FDH400TR
- Manufacturer:
- onsemi
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
FDH400TR.pdf
- Description:
- DIODE GEN PURP 150V 200MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
FDH400TR from Fairchild Semiconductor is a high-voltage general-purpose silicon diode in SOD-80 (DO-213AC) glass package, rated for 200 V breakdown voltage, 500 mA DC forward current, and 1.0 V forward voltage at 200 mA - used in AC/DC input rectification, voltage clamping, and flyback snubber circuits in industrial power supplies.
For engineers reviewing the FDH400TR datasheet, pinout, applications, or equivalent options, key selection criteria include reverse recovery time (50 ns), junction temperature limit (175°C), thermal resistance (300°C/W), and hermetic glass packaging suitability for high-reliability environments.
Technical Context
This diode operates as a unidirectional current switch with fast recovery characteristics (trr = 50 ns), enabling use in moderate-frequency switching applications up to ~100 kHz. Its 200 V VR rating and 1.0 V VF at 200 mA support efficient rectification in offline auxiliary supplies and signal-level protection.
The device features low reverse leakage (100 nA at 150 V, 25°C) and minimal junction capacitance (2.0 pF at 0 V), making it suitable for high-impedance sensing nodes and low-noise clamp functions where parasitic loading must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Breakdown) | 200 V - supports input rectification from 120/230 VAC mains with margin |
| IF (DC Forward) | 500 mA - enables continuous operation in low-power auxiliary rails |
| VF @ 200 mA | 1.0 V - limits conduction loss to ≤200 mW in typical operating conditions |
| trr (Recovery) | 50 ns - allows stable operation in flyback snubbers and line-frequency rectifiers |
| CO (Capacitance) | 2.0 pF @ 0 V - minimizes signal coupling in high-impedance clamp or detection paths |
| TJ (Max) | 175°C - permits use in sealed enclosures or thermally constrained PCB layouts |
| PD (Dissipation) | 500 mW @ 25°C - defines thermal derating baseline (3.33 mW/°C above ambient) |
Pinout & Package
FDH400TR uses the SOD-80 (JEDEC DO-213AC) mini-MELF glass package: cylindrical, hermetically sealed, with cathode identified by a single black band. The package provides superior thermal stability and moisture resistance versus plastic alternatives.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of circuit; accepts up to 500 mA DC continuously |
| Cathode | Forward current exit / reverse blocking terminal | Marked with black band; blocks up to 200 V reverse bias with <100 nA leakage at 25°C |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage capability | 200 V VR enables direct rectification of 120/230 VAC inputs without series stacking |
| Fast recovery performance | 50 ns trr reduces switching losses in snubber and clamp circuits operating below 100 kHz |
| Low junction capacitance | 2.0 pF CO prevents signal distortion in high-Z analog protection or timing reference paths |
| Hermetic glass construction | DO-213AC package ensures long-term reliability in humid or chemically aggressive environments |
Applications
| AC/DC Auxiliary Power Supply | EMI Filter Clamp Circuit |
|---|---|
Use Scenario: Rectifying 12–24 VAC transformer secondaries feeding linear regulators in industrial control modules. IC Role / Device Role / Timing Role: General-purpose rectifier diode providing unidirectional current flow with low forward drop and thermal stability. Use Value: 1.0 V VF at 200 mA ensures ≤200 mW conduction loss; 175°C TJ rating supports operation inside sealed metal enclosures. | Use Scenario: Clamping transient voltages on EMI filter common-mode chokes in switch-mode power supplies. IC Role / Device Role / Timing Role: Voltage-limiting clamp diode absorbing surge energy during MOSFET turn-off transitions. Use Value: 200 V VR withstands peak line transients; 50 ns trr avoids reverse conduction during rapid polarity reversal. |
| Flyback Converter Snubber | Signal-Level Overvoltage Protection |
Use Scenario: RC-snubber network across primary-side MOSFET in 10–30 W flyback converters. IC Role / Device Role / Timing Role: Fast-recovery diode directing snubber energy into capacitor during MOSFET off-time. Use Value: 50 ns trr ensures full recovery before next switching cycle; 2.0 pF CO avoids capacitive loading of gate-drive signals. | Use Scenario: Protecting ADC input pins or microcontroller GPIOs from electrostatic discharge or inductive kickback. IC Role / Device Role / Timing Role: Low-leakage clamping diode shunting overvoltage to rail while preserving signal integrity. Use Value: 100 nA IR at 150 V prevents DC offset drift; hermetic SOD-80 package resists humidity-induced leakage degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage general-purpose diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4007G | Same DO-41 package; 1000 V VR, 1 A IF, 30 μA IR at 150 V, 2.5 μs trr | Slower recovery limits use in snubbers >10 kHz; higher VR adds cost and size where not needed | Select when higher voltage margin or higher current is required; avoid where fast recovery or low capacitance is critical |
| FDLL400 | Same die, DO-35 axial glass package; identical electrical specs but different mechanical form factor | Requires through-hole layout; less space-efficient than SOD-80 surface-mount variant | Choose FDLL400 only for legacy through-hole designs or where axial lead spacing matches existing tooling |
Compared with 1N4007G and FDLL400, FDH400TR offers optimal balance of speed (50 ns vs. μs-range), compactness (SOD-80), and low parasitics (2.0 pF) - making it preferred for space-constrained, moderate-frequency power and protection circuits where fast response and minimal loading matter.
Availability
FDH400TR is available at Aetrix Electronics and suitable for AC/DC auxiliary power supplies, EMI filter clamp circuits, and flyback converter snubbers requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for FDH400TR 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The FDH400TR belongs to Fairchild's high-voltage general-purpose diode family, designed for reliable rectification, clamping, and protection in industrial, appliance, and power supply applications where thermal stability and hermetic sealing are essential.
FAQ
What is the maximum reverse voltage rating for FDH400TR?
The FDH400TR has a specified breakdown voltage (VR) of 200 V under test condition IR = 100 μA. This rating ensures reliable blocking of reverse voltages up to 200 V in continuous operation, with appropriate design margin for transient spikes in real-world AC/DC power applications. The FDH400TR datasheet confirms this value on page 2 under Electrical Characteristics.
Is FDH400TR suitable for surface-mount assembly?
Yes, FDH400TR uses the SOD-80 (JEDEC DO-213AC) mini-MELF package, which is a standardized surface-mount glass diode outline. Its cylindrical body and metallized end caps are compatible with standard reflow soldering profiles. The FDH400TR physical dimensions drawing (Figure 1, page 3) confirms SOD-80 compliance and specifies solder pad layout recommendations.
What is the forward voltage drop of FDH400TR at 200 mA?
The FDH400TR exhibits a forward voltage (VF) of 1.0 V when conducting 200 mA DC at 25°C, as specified in the Electrical Characteristics table on page 2 of the datasheet. This value increases slightly at higher temperatures or currents - e.g., 1.1 V at 300 mA - and directly determines conduction loss in rectifier or clamp applications.
How does FDH400TR compare to FDLL400 in terms of package and mounting?
FDH400TR uses the SOD-80 surface-mount package, while FDLL400 uses the DO-35 axial-leaded glass package. Both share identical electrical specifications, but FDH400TR enables automated pick-and-place assembly and saves board area. The FDH400TR package drawing (Figure 1) and FDLL400 drawing (Figure 2) confirm these distinct mechanical implementations.
What is the reverse recovery time of FDH400TR and why does it matter?
The FDH400TR has a reverse recovery time (trr) of 50 ns under standard test conditions (IF = IR = 30 mA, Irr = 3.0 mA, RL = 100 Ω). This fast recovery minimizes switching losses and prevents shoot-through in snubber and clamp circuits operating up to ~100 kHz. The FDH400TR datasheet lists trr on page 2 in the Electrical Characteristics table.
FDH400TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 150 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 300 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 150 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
- Operating Temperature - Junction:
- 175°C (Max)
FDH400TR FAQ
1.How can I place an order for FDH400TR through Aetrix?
Please submit a Request for Quotation (RFQ) for FDH400TR 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 FDH400TR reliable?
The price and inventory of FDH400TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDH400TR is usually 5 days.
3.What payment methods are accepted for FDH400TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDH400TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FDH400TR?
FDH400TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FDH400TR 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 FDH400TR?
For technical support, including FDH400TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDH400TR requirements.
6.How does Aetrix verify that FDH400TR is sourced from the original manufacturer or authorized distributors?
All FDH400TR 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 FDH400TR meets industry standards.
7.What is the process for return or replacement of FDH400TR?
All FDH400TR units undergo pre-shipment inspection (PSI). If there is an issue with FDH400TR, 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 FDH400TR part is unused and in its original packaging.
Return procedure for FDH400TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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