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Diodes Incorporated UG1004-T
- Part No.:
- UG1004-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
UG1004-T.pdf
- Description:
- DIODE GEN PURP 400V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
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Product details
Overview
UG1004-T from Diodes Incorporated is a 1.0A ultra-fast glass passivated rectifier diode in DO-41 package, rated for 400V peak repetitive reverse voltage (VRRM), 1.3V forward voltage at 1.0A (VFM), and 50ns reverse recovery time (trr), used in high-frequency AC/DC conversion stages of switch-mode power supplies.
For engineers reviewing the UG1004-T datasheet, UG1004-T pinout, UG1004-T application, or UG1004-T equivalent, key selection criteria include VRRM derating margin, trr-dependent switching loss trade-offs, thermal resistance (RθJA = 95°C/W), and DO-41 lead-form compatibility with legacy through-hole PCB layouts.
Technical Context
This device implements a planar-diffused PN junction with glass passivation to suppress surface leakage and enable stable operation up to 150°C junction temperature. Its ultra-fast recovery (50ns) results from controlled carrier lifetime reduction, minimizing stored charge (Qrr) during commutation.
The DO-41 axial package supports 1.0A average forward current only when leads are held at ambient temperature at ≥9.5mm from case; derating begins at 55°C ambient per Figure 1. Capacitance (20pF at 1MHz, 4V reverse) and low IR (5.0μA @ 25°C) support noise-sensitive rectification in EMI-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400V - Maximum non-repetitive reverse voltage before avalanche breakdown; sets minimum input voltage isolation margin in offline SMPS. |
| IO @ TA=55°C | 1.0A - Continuous DC output current capability under defined thermal mounting condition; requires heatsinking above ambient. |
| VFM @ IF=1.0A | 1.3V - Forward conduction loss at rated current; contributes directly to I²R heating and efficiency drop in rectifier stage. |
| trr | 50ns - Time to transition from forward conduction to reverse blocking; critical for reducing switching losses in >100kHz topologies. |
| RθJA | 95°C/W - Junction-to-ambient thermal resistance in free-air; determines maximum power dissipation before exceeding 150°C Tj limit. |
| IRM @ 25°C | 5.0μA - Reverse leakage at rated VR; impacts standby power and high-impedance bias networks. |
| CT @ 1MHz | 20pF - Junction capacitance under 4V reverse bias; affects high-frequency ringing and EMI filter design. |
Pinout & Package
DO-41 axial-leaded plastic package with cathode band marking; body diameter 4.06–5.21mm, length 25.4mm, lead diameter 0.71–0.864mm, lead spacing 2.00–2.72mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to AC source or transformer secondary; must withstand surge current (IFSM = 30A) during cold-start. |
| Cathode | Forward current exit node | Connected to output capacitor or load; marked by band; polarity reversal causes catastrophic failure. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Eliminates surface contamination-induced leakage drift; enables stable IR performance over 10+ year field life. |
| Ultra-fast switching (50ns trr) | Reduces reverse recovery loss by >60% vs standard rectifiers; essential for >200kHz flyback or LLC converters. |
| 30A non-repetitive surge rating | Withstands inrush currents from large bulk capacitors without degradation; no external fusing required in many 12W–24W adapters. |
| RoHS-compliant tin-plated leads | Ensures solderability per MIL-STD-202 Method 208; compatible with lead-free reflow and wave soldering processes. |
Applications
| AC/DC Adapter Input Rectification | DC-DC Converter Output Freewheeling |
|---|---|
Use Scenario: 12V/2A offline adapter converting 85–265VAC to regulated DC using flyback topology. IC Role / Device Role / Timing Role: Primary-side bridge rectifier converting AC line to pulsating DC prior to PWM controller and transformer. Use Value: 50ns trr minimizes switching loss during MOSFET turn-on, improving full-load efficiency by ~1.2% versus UF1004 equivalents. | Use Scenario: Secondary-side synchronous rectification replacement in isolated 5V/3A buck-derived converter. IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer leakage inductance energy during main switch off-time. Use Value: Low VFM (1.3V) reduces conduction loss in discontinuous conduction mode, lowering thermal stress on output rectifier layout. |
| Industrial Sensor Power Supply | LED Driver Bulk Rectification |
Use Scenario: 24VDC-powered industrial pressure sensor with integrated signal conditioning and RS-485 interface. IC Role / Device Role / Timing Role: Input rectifier in compact 1W auxiliary supply derived from 24VAC control rail. Use Value: 95°C/W RθJA allows operation at 70°C ambient without heatsink, meeting IP67 enclosure thermal limits. | Use Scenario: Outdoor LED streetlight driver with universal AC input and constant-current output. IC Role / Device Role / Timing Role: Bulk rectifier feeding PFC stage; subjected to repeated lightning-induced surges. Use Value: 30A IFSM rating absorbs 10/1000μs surge transients without parameter shift, eliminating need for parallel MOVs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L06 | VRRM = 600V, trr = 50ns, VFM = 1.3V, same DO-41 package | Higher voltage margin suits 277VAC lighting systems; identical thermal profile | Select when system requires >400V isolation headroom or operates in 277VAC regions. |
| ON Semiconductor MUR1040 | VRRM = 400V, trr = 60ns, VFM = 1.25V, DO-41 | Slightly lower VFM improves light-load efficiency; 10ns slower trr increases switching loss at >300kHz | Prefer for cost-sensitive 60–120kHz designs where conduction loss dominates. |
Compared with STTH1L06 and MUR1040, UG1004-T offers optimal balance of 400V rating, 50ns trr, and proven reliability in long-lifecycle industrial adapters-making it preferred where BOM stability and qualification history outweigh marginal VFM or VRRM differences.
Availability
UG1004-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial sensor power supplies, LED driver bulk rectification, and DC-DC converter freewheeling requiring stable component supply across multi-year production cycles.
Supply support for UG1004-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, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The UG100x series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC conversion in consumer, industrial, and lighting power supplies where thermal robustness and surge immunity are critical.
FAQ
Is UG1004-T suitable for surface-mount assembly?
No. UG1004-T uses a DO-41 axial-leaded package designed exclusively for through-hole mounting. Its lead geometry, body dimensions, and thermal path require hole placement and wave soldering or hand-soldering. Surface-mount alternatives like SMBF1040 or SMCJ400A must be selected separately.
What is the maximum allowable junction temperature for continuous operation?
The absolute maximum junction temperature is +150°C, as specified in the datasheet's Operating and Storage Temperature Range. Sustained operation above this limit risks irreversible parametric shift and premature failure. Derating curves (Figure 1) confirm 1.0A IO is valid only up to 55°C ambient unless heatsinking is applied.
Does UG1004-T meet automotive AEC-Q101 requirements?
No. UG1004-T is not qualified to AEC-Q101. It is rated for industrial and commercial applications only. Diodes Incorporated does not list this part in its AEC-Q101-certified rectifier portfolio; automotive-grade alternatives such as the DFLS160Q or SB160Q should be used instead.
Why is UG1004-T marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's internal product lifecycle policy: newer rectifiers (e.g., DFLS140, SB140) offer superior trr (<35ns), lower VFM (<1.1V), and smaller packages (SMA/SMB). While UG1004-T remains fully functional and supported, new designs are encouraged to adopt these enhanced alternatives for improved efficiency and board space savings.
UG1004-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):
- 400 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
UG1004-T FAQ
1.How can I place an order for UG1004-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UG1004-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 UG1004-T reliable?
The price and inventory of UG1004-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UG1004-T is usually 5 days.
3.What payment methods are accepted for UG1004-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UG1004-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UG1004-T?
UG1004-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UG1004-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 UG1004-T?
For technical support, including UG1004-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UG1004-T requirements.
6.How does Aetrix verify that UG1004-T is sourced from the original manufacturer or authorized distributors?
All UG1004-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 UG1004-T meets industry standards.
7.What is the process for return or replacement of UG1004-T?
All UG1004-T units undergo pre-shipment inspection (PSI). If there is an issue with UG1004-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 UG1004-T part is unused and in its original packaging.
Return procedure for UG1004-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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