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Diodes Incorporated DL4934-13
- Part No.:
- DL4934-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
DL4934-13.pdf
- Description:
- DIODE GEN PURP 100V 1A MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,047
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Product details
Overview
DL4934-13 from Diodes Incorporated is a 1.0A surface-mount fast recovery rectifier in MELF package, rated for 100V peak repetitive reverse voltage (VRRM), 1.2V max forward voltage at 1.0A, and 200ns reverse recovery time - used in AC/DC input stage rectification for compact power supplies and LED drivers.
For engineers reviewing the DL4934-13 datasheet, DL4934-13 pinout, DL4934-13 application, or DL4934-13 equivalent, key selection criteria include VRRM derating for capacitive loads, thermal derating above 75°C terminal temperature, and MELF mounting compatibility with high-reliability industrial and lighting designs.
Technical Context
This device is a single-phase, half-wave silicon rectifier optimized for fast switching in 50/60Hz line-frequency applications. Its 200ns reverse recovery time and 15pF junction capacitance support reduced switching losses and EMI in compact off-line converters.
Designed for resistive or inductive loads at 60Hz, it requires 20% current derating under capacitive loading conditions. Thermal performance is defined by terminal temperature (TT), not ambient, with full-rated 1.0A output only up to TT = 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100 V - Maximum repetitive reverse voltage before breakdown; defines safe AC input voltage range (e.g., ≤70V RMS). |
| IO @ TT = 75°C | 1.0 A - Continuous average forward current rating at 75°C terminal temperature; not ambient-limited. |
| VFM @ IF = 1.0A | 1.2 V - Forward voltage drop determining conduction loss and thermal rise in rectifier stage. |
| trr | 200 ns - Reverse recovery time affecting turn-off loss and snubber design in flyback or bridge configurations. |
| CT @ 1MHz, 4V | 15 pF - Junction capacitance influencing high-frequency noise coupling and EMI filter sizing. |
| IFSM (8.3ms) | 30 A - Non-repetitive surge current capability during cold-start or inrush events. |
| Operating Temp | –65°C to +150°C - Wide junction temperature range enabling use in automotive under-hood or industrial environments. |
Pinout & Package
MELF (Metal Electrode Leadless Face) cylindrical surface-mount package with axial cathode band marking; no leads, soldered directly via end caps; polarity identified by single black cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (End Cap) | Forward current entry point | Connected to AC input or transformer secondary; must withstand full surge current and thermal cycling. |
| Cathode (End Cap w/ Band) | Forward current exit / reverse blocking node | Connected to bulk capacitor or DC bus; reverse voltage rating applies across this terminal pair. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery (trr = 200 ns) | Enables efficient operation in higher-frequency line-synchronized topologies without excessive switching loss. |
| Glass passivated junction | Provides stable leakage performance and long-term reliability under humidity and thermal stress. |
| Low forward voltage (1.2 V @ 1A) | Reduces conduction loss by ~15% vs standard 1N400x series, lowering heatsink requirements. |
| MELF package with UL 94V-0 rating | Supports high-density PCB layouts and meets flammability safety standards for Class II power supplies. |
Applications
| AC/DC Adapter Input Stage | LED Driver Bridge Arm |
|---|---|
Use Scenario: Rectifying 50/60Hz AC mains into DC for low-power wall adapters (≤15W). IC Role / Device Role / Timing Role: Primary-side unidirectional current path in half-wave configuration; handles full line voltage reversal. Use Value: 100V VRRM safely covers 120VAC nominal with margin; 1.2V VFM minimizes heat generation in sealed enclosures. | Use Scenario: Half-wave rectification in constant-current LED driver front-end with capacitive input filter. IC Role / Device Role / Timing Role: Isolates AC input from DC output while limiting reverse conduction during zero-crossing. Use Value: 200ns trr reduces capacitive discharge ringing; MELF form factor allows tight layout near EMI-sensitive LED strings. |
| Industrial Sensor Power Supply | White Goods Control Board Input |
Use Scenario: Providing isolated DC bias for analog sensor signal conditioning in factory automation systems. IC Role / Device Role / Timing Role: Line-frequency rectifier feeding linear regulator or low-noise LDO; operates continuously at elevated ambient temperatures. Use Value: –65°C to +150°C operating range ensures stability in unventilated control cabinets; glass passivation prevents parametric drift over 10+ year life. | Use Scenario: Mains input rectification on washing machine or refrigerator main control board. IC Role / Device Role / Timing Role: First-stage AC-to-DC conversion before bulk capacitor and SMPS controller IC. Use Value: 30A IFSM withstands motor startup surges; RoHS-compliant matte tin finish supports automated reflow without whisker risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4934-T | Same VRRM (100V), IO (1.0A), and trr (200ns); TO-220AC package instead of MELF. | Requires through-hole mounting and larger PCB area; better suited for high-power dissipation with heatsink. | Select when thermal management demands leaded package or higher surge robustness beyond MELF limits. |
| ES1J | Lower VRRM (600V), same IO (1.0A), faster trr (35ns); SMA package. | Over-specified reverse voltage for 120VAC use; smaller footprint but lower surge rating (IFSM = 30A vs ES1J's 25A). | Choose for space-constrained designs needing faster recovery, accepting tighter VRRM margin and reduced surge headroom. |
Compared with 1N4934-T and ES1J, DL4934-13 offers optimal balance of MELF reliability, 100V rating matched to common AC inputs, and proven thermal performance in sealed, high-density power modules - making it preferred for cost-sensitive, volume-manufactured consumer and industrial power supplies.
Availability
DL4934-13 is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting drivers, and white goods control boards requiring stable component supply and RoHS-compliant manufacturing.
Supply support for DL4934-13 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 and manufacturing operations across Asia and the Americas.
The DL4933–DL4937 series targets cost-effective, high-reliability line-frequency rectification in space-constrained surface-mount power supplies and lighting systems.
FAQ
What is the maximum allowable terminal temperature for continuous 1.0A operation?
DL4934-13 delivers its full 1.0A average forward current rating only when the terminal temperature (TT) is maintained at or below 75°C. Above this temperature, current must be linearly derated per Figure 2 in the datasheet - e.g., at TT = 100°C, IO drops to approximately 0.75A.
Can DL4934-13 be used in capacitive-input filter circuits without modification?
No - the datasheet explicitly requires 20% current derating for capacitive loads due to higher peak currents. At 1.0A rated IO, the usable current drops to 0.8A in such configurations to prevent overheating and premature failure.
Is the MELF package compatible with standard SMT reflow profiles?
Yes - DL4934-13 uses matte tin plating compliant with MIL-STD-202 Method 208 and supports standard lead-free reflow profiles. Its UL 94V-0 molded plastic body withstands peak temperatures up to 260°C for 10 seconds without delamination or marking loss.
How does DL4934-13 differ from standard 1N4004 diodes in practical design?
DL4934-13 offers 200ns reverse recovery (vs >2μs for 1N4004), 1.2V forward drop (vs ~1.1V), and MELF packaging - enabling higher efficiency in switched-mode inputs, better EMI behavior, and superior thermal cycling reliability in automated assembly, though at higher unit cost.
DL4934-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 100 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 200 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 100 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
- Operating Temperature - Junction:
- -65°C ~ 150°C
DL4934-13 FAQ
1.How can I place an order for DL4934-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DL4934-13 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 DL4934-13 reliable?
The price and inventory of DL4934-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DL4934-13 is usually 5 days.
3.What payment methods are accepted for DL4934-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DL4934-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DL4934-13?
DL4934-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DL4934-13 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 DL4934-13?
For technical support, including DL4934-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DL4934-13 requirements.
6.How does Aetrix verify that DL4934-13 is sourced from the original manufacturer or authorized distributors?
All DL4934-13 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 DL4934-13 meets industry standards.
7.What is the process for return or replacement of DL4934-13?
All DL4934-13 units undergo pre-shipment inspection (PSI). If there is an issue with DL4934-13, 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 DL4934-13 part is unused and in its original packaging.
Return procedure for DL4934-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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