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Diodes Incorporated 1N4937L-T
- Part No.:
- 1N4937L-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4937L-T.pdf
- Description:
- DIODE GEN PURP 600V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
1N4937L-T from Diodes Incorporated is a 1.0A fast recovery rectifier diode in DO-41 package, rated for 600V peak repetitive reverse voltage, 1.2V forward voltage drop at 1.0A, and 200ns reverse recovery time, used in AC/DC front-end rectification and flyback snubber circuits.
For engineers reviewing the 1N4937L-T datasheet, 1N4937L-T pinout, 1N4937L-T application, or 1N4937L-T equivalent, key selection criteria include VRRM=600V, IFSM=30A surge rating, tRR=200ns recovery speed, low IRM=5.0μA @25°C, and DO-41 mechanical compatibility with through-hole power supplies.
Technical Context
This device employs a diffused junction structure to achieve fast switching with low forward conduction loss and controlled reverse recovery behavior. Its 200ns tRR and 15pF junction capacitance support operation in 20–100kHz SMPS rectifier stages without excessive switching loss or EMI generation.
The 600V VRRM rating enables use in universal-input (85–265VAC) offline power supplies, while the 30A non-repetitive surge capability accommodates inrush current events during cold-start conditions without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600 V - Withstands peak reverse voltage in universal-input AC/DC rectifiers without breakdown. |
| IF(AV) | 1.0 A @ TA=+75°C - Sustains continuous output current in compact PCB-mounted designs with 9.5mm lead length. |
| VFM | 1.2 V @ IF=1.0A - Minimizes conduction loss and thermal rise in high-efficiency 1A-level power conversion stages. |
| tRR | 200 ns - Enables reliable operation up to ~100kHz switching frequencies with controlled reverse recovery charge. |
| IFSM | 30 A (8.3ms half-sine) - Survives cold-start inrush surges in offline SMPS and adapter applications. |
| IRM | 5.0 μA @ VR=600V, TA=25°C - Ensures low leakage in high-impedance hold-up or sensing paths. |
| RθJA | 100 °C/W - Defines thermal limit for ambient-operated DO-41 mounting without heatsink in free-air conditions. |
Pinout & Package
Package: DO-41 molded plastic case, cathode band marking, lead-free bright tin plating, UL 94V-0 flammability rating, 0.35g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to AC input or transformer secondary; must handle full 1.0A average and 30A surge currents. |
| Cathode | Forward current exit node | Connected to DC bus or filter capacitor; marked by visible band; carries same current as anode with 1.2V drop. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery time | 200 ns - Reduces switching loss and EMI in 50–100 kHz flyback and forward converters. |
| High surge rating | 30 A peak - Supports robust cold-start performance in universal-input AC/DC adapters without derating. |
| Low forward voltage | 1.2 V @ 1.0A - Limits conduction loss to ≤1.2W at full load, easing thermal management on DO-41 footprint. |
| Low reverse leakage | 5.0 μA @ 600V - Maintains efficiency in high-voltage hold-up circuits and reduces standby power loss. |
| RoHS-compliant finish | Bright tin plating - Ensures solderability per MIL-STD-202 Method 208 and compliance with EU RoHS 3 directives. |
Applications
| AC/DC Adapter Rectification | Flyback Converter Output Stage |
|---|---|
Use Scenario: 12V/1A wall adapter with universal AC input (85–265VAC) and 65kHz flyback topology. IC Role / Device Role / Timing Role: Primary-side input rectifier converting AC line to unregulated DC bus prior to transformer isolation. Use Value: 600V VRRM ensures margin against line transients; 1.2V VFM keeps conduction loss under 1.2W at full load. | Use Scenario: Secondary-side synchronous rectification replacement in 5V/2A isolated flyback supply for IoT gateway. IC Role / Device Role / Timing Role: Fast-recovery output rectifier delivering regulated DC to bulk capacitor and load. Use Value: 200ns tRR minimizes reverse recovery loss during high-frequency switching, improving overall efficiency by ~0.8%. |
| Industrial Power Supply Input Stage | LED Driver Bulk Rectification |
Use Scenario: 24V/1.5A DIN-rail power supply operating in ambient up to +70°C with 50Hz–60Hz line frequency. IC Role / Device Role / Timing Role: Half-wave or full-wave bridge rectifier element handling continuous 1.0A average current. Use Value: 100°C/W RθJA allows direct PCB mounting with minimal copper area; 30A IFSM withstands motor-start surges. | Use Scenario: Constant-current LED driver for street lighting with 300VDC intermediate bus derived from rectified 230VAC. IC Role / Device Role / Timing Role: High-voltage bulk rectifier feeding PFC stage or DC link capacitor. Use Value: 600V VRRM provides 2× safety margin over 300VDC bus; low IRM prevents leakage-induced dimming drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RS1J-T | VRRM=600V, IF(AV)=1.0A, tRR=250ns, VFM=1.3V - Slightly slower recovery and higher VF. | Same DO-41 package; suitable for lower-frequency (<50kHz) rectification where EMI is less critical. | Prefer when cost sensitivity outweighs 50ns tRR advantage and 0.1V VF penalty is acceptable. |
| 1N4007-T | VRRM=1000V, IF(AV)=1.0A, tRR≈2μs, VFM=1.1V - Much slower recovery, higher leakage (~50μA), but higher voltage rating. | Used in low-frequency linear supplies and basic battery chargers where fast recovery is unnecessary. | Select only for 50/60Hz applications requiring >600V margin; avoid in SMPS due to excessive switching loss. |
Compared with RS1J-T and 1N4007-T, the 1N4937L-T delivers optimal balance of 600V rating, 200ns speed, and 1.2V VF for modern 50–100kHz SMPS rectification-making it superior for efficiency-critical, space-constrained AC/DC designs.
Availability
1N4937L-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial power supplies, LED drivers, and flyback converter output stages requiring stable component supply and consistent DO-41 mechanical fit.
Supply support for 1N4937L-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, specializing in high-reliability power management, signal integrity, and protection solutions.
The 1N4933–1N4937 series belongs to Diodes' general-purpose fast recovery rectifier product line, designed specifically for cost-sensitive, high-volume AC/DC front-end and secondary-side rectification in consumer and industrial power supplies.
FAQ
Is 1N4937L-T suitable for surface-mount assembly?
No. The 1N4937L-T uses a DO-41 axial-lead package intended for through-hole mounting. It lacks SMD-compatible terminations or land patterns. For surface-mount alternatives, consider SMA/SMB-packaged fast rectifiers like the ES1J or MUR120 series with equivalent ratings.
What is the maximum operating temperature for continuous 1.0A current?
The 1N4937L-T supports 1.0A average forward current only at TA = +75°C, as specified in the datasheet. At higher ambient temperatures, derating is required per Figure 1 - e.g., at +100°C ambient, maximum IF(AV) drops to approximately 0.65A with standard PCB mounting and 9.5mm lead length.
Does this diode have a specified junction-to-case thermal resistance?
No. The datasheet provides only junction-to-ambient thermal resistance (RθJA = 100°C/W) under defined test conditions (PCB-mounted, 9.5mm lead length). Junction-to-case (RθJC) is not characterized or guaranteed for the DO-41 package, as it is not a thermally optimized case design for heatsink attachment.
Can 1N4937L-T replace 1N4007 in a switching power supply?
Yes, electrically - both are 1A, DO-41 rectifiers - but 1N4937L-T is strongly preferred in SMPS due to its 200ns tRR versus 1N4007's ~2μs. Using 1N4007 in high-frequency designs causes excessive switching loss, heating, and potential failure. Only use 1N4007 in 50/60Hz linear supplies.
1N4937L-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):
- 600 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 @ 600 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4937L-T FAQ
1.How can I place an order for 1N4937L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4937L-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 1N4937L-T reliable?
The price and inventory of 1N4937L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4937L-T is usually 5 days.
3.What payment methods are accepted for 1N4937L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4937L-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4937L-T?
1N4937L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4937L-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 1N4937L-T?
For technical support, including 1N4937L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4937L-T requirements.
6.How does Aetrix verify that 1N4937L-T is sourced from the original manufacturer or authorized distributors?
All 1N4937L-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 1N4937L-T meets industry standards.
7.What is the process for return or replacement of 1N4937L-T?
All 1N4937L-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4937L-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 1N4937L-T part is unused and in its original packaging.
Return procedure for 1N4937L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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