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Diodes Incorporated UG1003-T
- Part No.:
- UG1003-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
UG1003-T.pdf
- Description:
- DIODE GEN PURP 200V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,369
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Product details
Overview
UG1003-T from Diodes Incorporated is a 1.0A ultra-fast glass passivated rectifier diode in DO-41 package, rated for 200V peak repetitive reverse voltage (VRRM), 1.7V forward voltage at 1.0A, and 50ns reverse recovery time (trr), used in high-frequency AC/DC conversion stages of switch-mode power supplies and DC motor drive freewheeling paths.
For engineers reviewing the UG1003-T datasheet, UG1003-T pinout, UG1003-T application, or UG1003-T equivalent, key selection criteria include VRRM=200V, trr=50ns, IF(AV)=1.0A @ TA=55°C, IRM=5.0μA @ 25°C, and DO-41 mechanical compatibility with through-hole PCB layouts requiring low leakage and fast switching.
Technical Context
This device implements a single-junction silicon PN rectifier structure with glass passivation for enhanced surface stability and moisture resistance. Its ultra-fast recovery (trr=50ns) enables operation in 50–500kHz SMPS output stages without excessive switching loss.
Rated for 30A non-repetitive surge current (IFSM) and 95°C/W junction-to-ambient thermal resistance, it supports transient overload handling in inductive load circuits while maintaining low reverse leakage (IRM=5.0μA at 25°C) under nominal blocking conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse voltage the diode blocks reliably in AC line applications. |
| IF(AV) | 1.0 A @ TA=55°C - Continuous average forward current capability with leads held at ambient at 9.5mm from case. |
| VFM | 1.7 V @ IF=1.0A - Forward conduction loss impacting efficiency in high-current rectification paths. |
| trr | 50 ns - Reverse recovery time determining minimum usable switching frequency and commutation loss. |
| IRM | 5.0 μA @ 25°C - Low reverse leakage ensuring minimal standby power loss in high-impedance hold circuits. |
| RθJA | 95 °C/W - Thermal resistance defining junction temperature rise under natural convection, critical for derating. |
| IFSM | 30 A - Peak surge current tolerance enabling robustness against inrush and fault transients. |
Pinout & Package
DO-41 axial-leaded plastic package with cathode band marking; two-terminal device (anode and cathode) with no internal connections beyond the PN junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connects to AC source or inductive load return path during conduction phase. |
| Cathode | Forward current exit node / reverse voltage reference | Marked by band; connects to positive rail or snubber network; defines polarity-sensitive mounting. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates surface contamination sensitivity and improves long-term reliability in humid environments. |
| Ultra-fast switching (trr = 50 ns) | Reduces switching losses in 100–300 kHz SMPS outputs compared to standard recovery rectifiers. |
| 30A IFSM surge rating | Withstands motor startup currents and capacitor-charging surges without degradation. |
| RoHS-compliant tin-plated leads | Enables lead-free reflow soldering per MIL-STD-202 Method 208 with verified wetting performance. |
Applications
| AC/DC Adapter Output Stage | DC Motor Freewheeling Diode |
|---|---|
Use Scenario: Rectifying high-frequency transformer secondary output in compact wall adapters. IC Role / Device Role / Timing Role: Primary output rectifier conducting during positive half-cycles with minimal VFM-related loss. Use Value: 1.7V VFM and 50ns trr reduce conduction + switching loss, improving adapter efficiency above 85% at full load. | Use Scenario: Suppressing inductive kickback across brushed DC motor windings during PWM turn-off. IC Role / Device Role / Timing Role: Freewheeling path providing low-impedance return for stored magnetic energy. Use Value: 30A IFSM rating handles peak back-EMF surges; 5.0μA IRM prevents battery drain in standby mode. |
| Industrial Sensor Power Supply | LED Driver Secondary Rectification |
Use Scenario: Providing isolated 12V bias for analog sensor signal conditioning in factory automation nodes. IC Role / Device Role / Timing Role: Input-side rectifier converting 24VAC auxiliary supply to unregulated DC bus. Use Value: 200V VRRM accommodates line transients; DO-41 package fits constrained board space near sensor ICs. | Use Scenario: Converting high-frequency AC from flyback transformer secondary in constant-current LED drivers. IC Role / Device Role / Timing Role: Synchronous rectification alternative where cost-sensitive designs avoid active control. Use Value: 50ns trr minimizes dead-time loss; 95°C/W RθJA allows direct PCB copper pour heatsinking without extra thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R02U | VRRM=200V, trr=35ns, VFM=1.15V @ 1A, DO-41 | Lower VFM and faster trr improve efficiency in high-duty-cycle SMPS but require tighter layout for EMI control. | Select when optimizing for lowest conduction + switching loss at expense of slightly higher cost. |
| 1N4936 | VRRM=200V, trr=200ns, VFM=1.2V @ 1A, DO-41 | Slower recovery increases switching loss above 50kHz; suitable only for low-frequency linear supplies. | Choose only for legacy redesigns where trr >100ns is acceptable and cost is primary constraint. |
Compared with STTH1R02U and 1N4936, UG1003-T delivers balanced performance: lower VFM than 1N4936 and more robust surge rating than STTH1R02U, making it optimal for cost-sensitive industrial power supplies operating at 100–250kHz.
Availability
UG1003-T is available at Aetrix Electronics and suitable for switch-mode power supplies, DC motor drives, industrial sensor power rails, and LED driver secondary rectification requiring stable component supply and DO-41 through-hole compatibility.
Supply support for UG1003-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.
The UG100x series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency AC/DC conversion where low trr and controlled VFM are critical to system-level thermal and efficiency targets.
FAQ
Is UG1003-T suitable for surface-mount assembly?
No. UG1003-T uses a DO-41 axial-leaded package designed exclusively for through-hole mounting. It lacks gull-wing or J-lead geometry required for reflow soldering on SMT pads. Manual or wave soldering is required for PCB assembly.
What is the maximum allowable junction temperature for continuous operation?
The absolute maximum junction temperature is +150°C. For reliable long-term operation at full 1.0A average current, the ambient temperature must be limited to ≤55°C per the derating curve in Figure 1, assuming leads are maintained at ambient at 9.5mm from the case.
Does UG1003-T meet lead-free soldering requirements?
Yes. UG1003-T features RoHS-compliant tin-plated leads qualified to MIL-STD-202, Method 208, and supports lead-free reflow profiles up to 260°C peak temperature, consistent with JEDEC J-STD-020C Level 1 moisture sensitivity.
Why is UG1003-T marked "NOT RECOMMENDED FOR NEW DESIGN"?
Diodes Incorporated issued this notice because newer ultra-fast rectifiers (e.g., part numbers with 'U' or 'H' suffixes) offer improved trr, lower VFM, and enhanced surge robustness. UG1003-T remains fully functional and supported for existing production, but new designs should evaluate STTH1R02U or similar successors.
UG1003-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
UG1003-T FAQ
1.How can I place an order for UG1003-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UG1003-T 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 UG1003-T reliable?
The price and inventory of UG1003-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UG1003-T is usually 5 days.
3.What payment methods are accepted for UG1003-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UG1003-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UG1003-T?
UG1003-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UG1003-T 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 UG1003-T?
For technical support, including UG1003-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UG1003-T requirements.
6.How does Aetrix verify that UG1003-T is sourced from the original manufacturer or authorized distributors?
All UG1003-T 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 UG1003-T meets industry standards.
7.What is the process for return or replacement of UG1003-T?
All UG1003-T units undergo pre-shipment inspection (PSI). If there is an issue with UG1003-T, 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 UG1003-T part is unused and in its original packaging.
Return procedure for UG1003-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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