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Diodes Incorporated DL4935-13
- Part No.:
- DL4935-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
DL4935-13.pdf
- Description:
- DIODE GEN PURP 200V 1A MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,529
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Product details
Overview
DL4935-13 from Diodes Incorporated is a 1.0A surface-mount fast recovery rectifier in MELF package, rated for 200V 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 offline power supplies and DC-DC converter front-ends.
For engineers reviewing the DL4935-13 datasheet, DL4935-13 pinout, DL4935-13 application, or DL4935-13 equivalent, key selection criteria include VRRM derating for capacitive loads, thermal management at TT = 75°C, IRM leakage under 5.0µA, and compatibility with automated SMT placement on high-reliability industrial power boards.
Technical Context
This device operates as a single-phase, half-wave rectifier optimized for 60Hz resistive or inductive loads. Its glass-passivated junction ensures low leakage (IRM ≤ 5.0µA) and stable performance across -65°C to +150°C junction temperature range.
The 200ns reverse recovery time (trr) and 15pF typical junction capacitance (CT) support moderate-frequency switching in flyback and forward converter inputs, while the 30A non-repetitive surge rating (IFSM) handles line transients without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse blocking voltage before breakdown; sets safe AC input voltage limit for 115VAC systems with margin. |
| IO @ TT=75°C | 1.0 A - Continuous average forward current at terminal temperature of 75°C; defines usable DC output current in thermally constrained layouts. |
| VFM @ IF=1.0A | 1.2 V - Forward voltage drop at rated current; determines conduction loss (1.2W per diode at 1.0A) and thermal rise in rectifier string. |
| trr | 200 ns - Reverse recovery time under IF=1.0A, VR=30V, di/dt=50A/µs; limits minimum switching frequency and EMI generation in SMPS inputs. |
| IRM @ VR | 5.0 µA - Max DC reverse current at rated blocking voltage; critical for low-power standby circuits and high-impedance bias networks. |
| CT @ 1MHz, 4V | 15 pF - Junction capacitance at 4V reverse bias; affects high-frequency noise coupling and snubber design in fast-switching topologies. |
Pinout & Package
MELF (Metal Electrode Leadless Face) cylindrical surface-mount package with axial cathode band marking; 0.25g mass; UL 94V-0 flammability rating; matte tin lead-free plating compliant with RoHS Directive Annex Notes 5 and 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC input phase or transformer secondary; must withstand full surge current (30A) and reverse voltage stress. |
| Cathode | Forward current exit / reverse blocking node | Marked by black band; ties to bulk capacitor positive rail; reverse leakage (≤5µA) directly impacts no-load power consumption. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery (trr = 200ns) | Enables use in 50–100kHz SMPS input stages without excessive switching loss or ringing. |
| Glass passivated junction | Provides stable IRM < 5µA over lifetime and temperature, critical for energy-efficient standby modes. |
| Low VFM (1.2V @ 1.0A) | Reduces conduction loss by ~15% vs standard 1N4007 (1.4V), improving thermal margin in compact enclosures. |
| MELF package with 94V-0 rating | Supports high-density automated assembly and meets flame-retardant requirements for Class II power supplies. |
Applications
| Industrial AC/DC Adapters | LED Driver Input Rectification |
|---|---|
Use Scenario: 115VAC-to-12VDC offline adapter for factory automation I/O modules. IC Role / Device Role / Timing Role: Primary-side half-wave rectifier converting AC line to unregulated DC bus prior to PWM controller. Use Value: 200V VRRM provides 2× safety margin over 115VAC RMS; 1.0A IO supports up to 10W output with minimal heatsinking. | Use Scenario: Constant-current LED driver for outdoor signage operating from 230VAC mains. IC Role / Device Role / Timing Role: Input rectifier feeding bulk capacitor in non-isolated buck-PFC topology. Use Value: 200ns trr minimizes reverse recovery loss during 50kHz switching; low IRM prevents capacitor discharge in dimming-off state. |
| Medical Power Supply Inputs | UPS Battery Charger Front-End |
Use Scenario: Dual-output 5V/24V medical-grade power supply meeting IEC 60601-1 creepage requirements. IC Role / Device Role / Timing Role: Isolated rectifier in auxiliary winding circuit powering control logic and gate drivers. Use Value: Glass passivation ensures long-term IRM stability under continuous operation; MELF form factor aids creepage distance compliance. | Use Scenario: 24V battery charger in line-interactive UPS handling brownouts and surges. IC Role / Device Role / Timing Role: Half-wave rectifier charging maintenance float voltage from AC bypass path. Use Value: 30A IFSM withstands 10-cycle 170VAC surges; 150°C max Tj allows operation in sealed battery compartments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR120T3G | VRRM = 200V, trr = 75ns, IO = 1.0A, DO-41 package | Shorter trr reduces EMI but requires PCB layout changes; axial leads limit SMT throughput | Select when lower recovery loss outweighs assembly cost and board space constraints. |
| Vishay VS-1N4935-M3/54 | VRRM = 200V, trr = 250ns, IO = 1.0A, DO-41 package, higher IRM (10µA) | Higher leakage may impact standby power in energy-sensitive designs | Prefer where legacy DO-41 footprint reuse is mandatory and 5µA IRM margin is acceptable. |
Compared with DL4935-13, MUR120T3G offers faster recovery but sacrifices SMT compatibility, while VS-1N4935-M3/54 retains identical VRRM/IO but trades off leakage and package form factor - making DL4935-13 optimal for new MELF-based high-volume power designs requiring balanced speed, loss, and manufacturability.
Availability
DL4935-13 is available at Aetrix Electronics and suitable for industrial AC/DC adapters, LED driver input rectification, medical power supply inputs, and UPS battery charger front-ends requiring stable component supply and RoHS-compliant manufacturing.
Supply support for DL4935-13 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 centers across Asia and Europe, serving industrial, computing, and consumer markets.
The DL4933–DL4937 series targets cost-sensitive, high-reliability AC/DC front-end rectification, emphasizing thermal robustness, low leakage, and MELF SMT compatibility for automated power supply manufacturing.
FAQ
What is the maximum allowable reverse voltage for continuous operation?
The DL4935-13 has a peak repetitive reverse voltage (VRRM) rating of 200V. For continuous sinusoidal AC operation, the RMS voltage must not exceed 140V (200V ÷ √2), and derating by 20% is required for capacitive loads per datasheet Note 1. This ensures reliable blocking without avalanche conduction or thermal runaway.
Can DL4935-13 replace a standard 1N4007 in a 115VAC power supply?
Yes, but only if the application operates below 115VAC RMS and does not require >1.0A average forward current. DL4935-13 offers faster recovery (200ns vs 30µs), lower VFM (1.2V vs 1.4V), and MELF packaging - however, its 200V VRRM is lower than 1N4007's 1000V, limiting use to 115VAC systems with adequate safety margin.
Is the MELF package compatible with standard reflow soldering profiles?
Yes - the DL4935-13 uses matte tin lead-free plating and is qualified per MIL-STD-202, Method 208. It supports standard Pb-free reflow profiles (peak 260°C, 60s max above 217°C), with thermal mass and geometry validated for tombstoning resistance in high-speed pick-and-place assembly.
How does reverse recovery time affect EMI in switch-mode power supplies?
A 200ns trr causes measurable di/dt-induced voltage spikes during turn-off, especially in discontinuous conduction mode. These spikes couple into adjacent traces and increase conducted EMI above 30MHz. Adding a small RC snubber across the diode or selecting a slower (but lower-loss) alternative like DL4933 may reduce emissions where EMI compliance is critical.
DL4935-13 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):
- 200 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 @ 200 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
- Operating Temperature - Junction:
- -65°C ~ 150°C
DL4935-13 FAQ
1.How can I place an order for DL4935-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DL4935-13 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 DL4935-13 reliable?
The price and inventory of DL4935-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DL4935-13 is usually 5 days.
3.What payment methods are accepted for DL4935-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DL4935-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DL4935-13?
DL4935-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DL4935-13 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 DL4935-13?
For technical support, including DL4935-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DL4935-13 requirements.
6.How does Aetrix verify that DL4935-13 is sourced from the original manufacturer or authorized distributors?
All DL4935-13 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 DL4935-13 meets industry standards.
7.What is the process for return or replacement of DL4935-13?
All DL4935-13 units undergo pre-shipment inspection (PSI). If there is an issue with DL4935-13, 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 DL4935-13 part is unused and in its original packaging.
Return procedure for DL4935-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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