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Diodes Incorporated DL4933-13-F
- Part No.:
- DL4933-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
DL4933-13-F.pdf
- Description:
- DIODE GEN PURP 50V 1A MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,207
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Product details
Overview
DL4933-13-F from Diodes Incorporated is a 1.0A surface-mount fast recovery rectifier in MELF package, rated for 50V peak repetitive reverse voltage (VRRM), 1.2V max forward voltage at 1.0A, and 200ns reverse recovery time - used in AC/DC input stage of compact power supplies, LED drivers, and auxiliary bias rails where low loss and fast switching are required.
For engineers reviewing the DL4933-13-F datasheet, DL4933-13-F pinout, DL4933-13-F application, or DL4933-13-F equivalent, key selection criteria include VRRM derating for capacitive loads (−20% current), thermal derating above 75°C, MELF polarity marking (cathode band), and RoHS-compliant matte tin plating per EU Directive Annex Notes 5 & 7.
Technical Context
This device is a single-phase, half-wave silicon rectifier optimized for high-frequency switching applications up to 60Hz with resistive or inductive loads. Its 200ns trr enables reduced switching losses compared to standard recovery diodes, while the 15pF typical junction capacitance minimizes high-frequency noise coupling.
The MELF package provides superior thermal dissipation versus SOD-123 or DO-214AC, supporting 1.0A average forward current at TT = 75°C. For capacitive loads, current must be derated by 20% per datasheet specification, and full-load reverse current rises to 100µA at Tj = 55°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; defines safe AC input voltage ceiling in bridge or half-wave configurations. |
| IO @ TT=75°C | 1.0 A - Continuous forward current rating at terminal temperature 75°C; requires heatsinking or PCB copper area for sustained operation. |
| VFM @ IF=1.0A | 1.2 V - Forward voltage drop at rated current; determines conduction loss (1.2W at 1A) and thermal rise in compact layouts. |
| trr | 200 ns - Reverse recovery time under IF=1.0A, VR=30V, di/dt=50A/μs; critical for EMI control and efficiency in flyback snubbers. |
| CT @ 1MHz, VR=4V | 15 pF - Junction capacitance affecting high-frequency impedance and RF noise coupling in EMI filter design. |
| IRM @ VRRM | 5.0 µA - Max DC reverse leakage at rated blocking voltage; impacts standby power in always-on circuits. |
| Tj Range | −65°C to +150°C - Operating junction temperature range; supports automotive under-hood and industrial ambient conditions. |
Pinout & Package
MELF (Metal Electrode Leadless Face) glass-passivated cylindrical package with axial cathode band marking; 0.25g mass; UL 94V-0 flammability rating; solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC source or transformer secondary; polarity must align with cathode band during placement. |
| Cathode | Forward current exit / reverse blocking node | Marked by visible band; ties to output rail or ground return; reverse voltage applied here during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery (200ns) | Enables use in higher-frequency rectification without excessive switching loss or ringing in flyback converters. |
| Glass passivated junction | Provides stable leakage performance and long-term reliability under humidity and thermal cycling stress. |
| Low VF (1.2V @ 1A) | Reduces conduction loss by ~15% vs. standard 1N400x series, improving efficiency in space-constrained 5–12V auxiliary supplies. |
| RoHS-compliant matte tin finish | Meets EU Directive 2002/95/EC Annex Notes 5 & 7 exemptions; compatible with lead-free reflow profiles (J-STD-020). |
| MELF thermal performance | Superior heat spreading over flat-pack alternatives allows 1.0A operation with minimal PCB copper area at TT = 75°C. |
Applications
| AC/DC Adapter Input Stage | LED Driver Bias Supply |
|---|---|
Use Scenario: Half-wave rectification of 12–24VAC transformer output feeding a 5V buck converter in wall-plug adapters. IC Role / Device Role / Timing Role: Primary-side unidirectional current path; blocks reverse voltage during negative AC half-cycle. Use Value: 200ns trr suppresses high-frequency ringing that would otherwise couple into feedback loop and cause regulation instability. | Use Scenario: Rectifying 12VAC from a small toroidal transformer to generate isolated 12VDC for constant-current LED driver IC bias. IC Role / Device Role / Timing Role: Isolated auxiliary supply rectifier; operates at line frequency with minimal conduction loss. Use Value: 1.2V VF ensures >92% rectifier efficiency at 100mA load, extending thermal margin in sealed LED housings. |
| Industrial Sensor Power Rail | Automotive Body Control Module (BCM) Auxiliary Supply |
Use Scenario: Converting 24VAC from HVAC control transformers into regulated 3.3V for microcontroller and analog sensor rails. IC Role / Device Role / Timing Role: Input-stage rectifier in ultra-compact linear regulator front-end; handles transient surges up to 30A IFSM. Use Value: 30A surge rating withstands inrush from downstream bulk capacitance without degradation over 10⁵ cycles. | Use Scenario: Generating 5V bias from vehicle's 12VAC lighting circuit (e.g., headlamp ballast feedback winding) for BCM logic. IC Role / Device Role / Timing Role: Line-frequency rectifier exposed to −40°C to +125°C ambient; cathode band ensures correct polarity in automated assembly. Use Value: −65°C to +150°C Tj range maintains reliable conduction and blocking across full automotive temperature profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4933-T | Same VRRM (50V), IO (1.0A), and trr (200ns); TO-220AC package with higher thermal mass but larger footprint. | Used in through-hole prototyping or high-reliability industrial power modules requiring mechanical robustness. | Select when board-level vibration resistance or manual rework is prioritized over miniaturization. |
| ES1J | Higher VRRM (600V), lower IO (1.0A), faster trr (35ns); SMA package with 1.5× smaller footprint than MELF. | Suitable for universal-input SMPS PFC stages or high-voltage flyback snubbers where voltage margin >500V is required. | Select only if system demands >500V blocking; not interchangeable due to voltage rating mismatch in 50V designs. |
Compared with 1N4933-T and ES1J, DL4933-13-F uniquely balances MELF thermal efficiency, RoHS-compliant surface-mount compatibility, and precise 50V rating - making it optimal for cost-sensitive, space-constrained 24VAC-derived auxiliary supplies where voltage margin and surge handling are tightly specified.
Availability
DL4933-13-F is available at Aetrix Electronics and suitable for AC/DC adapter input stages, LED driver bias supplies, and industrial sensor power rails requiring stable component supply and consistent MELF packaging.
Supply support for DL4933-13-F 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 U.S.
The DL4933-13-F belongs to Diodes' fast recovery rectifier product line, engineered specifically for high-efficiency, compact AC/DC conversion in consumer, industrial, and automotive auxiliary power applications.
FAQ
What is the maximum allowable operating temperature for DL4933-13-F?
The junction temperature range is −65°C to +150°C, with average forward current derated linearly from 1.0A at TT = 75°C to zero at TT = 150°C per Figure 2. Terminal temperature must be measured on the MELF body surface using thermocouple contact; exceeding 150°C risks permanent parametric shift or bond wire failure.
Can DL4933-13-F replace a standard 1N4001 in a 12VAC circuit?
Yes, but only if reverse voltage remains ≤50V and surge current stays within 30A. Unlike the 1N4001 (50V VRRM, 30µs trr), DL4933-13-F offers 200ns trr and lower VF (1.2V vs. ~1.4V), reducing switching loss and heat generation - however, its MELF package requires compatible pick-and-place tooling and reflow profiling.
Is DL4933-13-F suitable for capacitive-input filter applications?
No - the datasheet explicitly requires 20% current derating for capacitive loads. At full 1.0A, the device may experience excessive peak current stress and accelerated wear. Use only with resistive or inductive loads unless derated to 0.8A and verified with worst-case inrush simulation.
Does DL4933-13-F have SPICE models available?
Yes - Diodes Incorporated provides verified SPICE models for DL4933 through DL4937 in the DS15001 Rev. 5-2 datasheet (page 2). The model includes nonlinear junction capacitance, temperature-dependent VF, and reverse recovery dynamics calibrated to test data at IF = 1.0A, VR = 30V, and di/dt = 50A/μs.
DL4933-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 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 @ 50 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
- Operating Temperature - Junction:
- -65°C ~ 150°C
DL4933-13-F FAQ
1.How can I place an order for DL4933-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DL4933-13-F 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 DL4933-13-F reliable?
The price and inventory of DL4933-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DL4933-13-F is usually 5 days.
3.What payment methods are accepted for DL4933-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DL4933-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DL4933-13-F?
DL4933-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DL4933-13-F 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 DL4933-13-F?
For technical support, including DL4933-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DL4933-13-F requirements.
6.How does Aetrix verify that DL4933-13-F is sourced from the original manufacturer or authorized distributors?
All DL4933-13-F 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 DL4933-13-F meets industry standards.
7.What is the process for return or replacement of DL4933-13-F?
All DL4933-13-F units undergo pre-shipment inspection (PSI). If there is an issue with DL4933-13-F, 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 DL4933-13-F part is unused and in its original packaging.
Return procedure for DL4933-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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