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Diodes Incorporated 1N4937L
- Part No.:
- 1N4937L
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4937L.pdf
- Description:
- DIODE GEN PURP 600V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:8,204
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Product details
Overview
1N4937L from Diodes Incorporated is a 1.0A fast recovery rectifier diode in DO-41 package, rated for 600V peak repetitive reverse voltage (VRRM), 1.2V forward voltage drop at 1.0A (VFM), and 200ns reverse recovery time (tRR), used in AC/DC input stage rectification of offline power supplies and DC-DC converter front-ends.
For engineers reviewing the 1N4937L datasheet, 1N4937L pinout, 1N4937L application, or 1N4937L equivalent, key selection criteria include VRRM rating for input surge margin, tRR for high-frequency switching efficiency, IRM leakage at elevated temperature, thermal resistance (RθJA = 100°C/W), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device employs a diffused junction structure to achieve fast recovery characteristics while maintaining low forward conduction loss. Its 200ns reverse recovery time enables operation in 20–100kHz SMPS topologies without excessive switching loss or EMI generation.
The 600V VRRM rating supports universal-input (85–265VAC) rectification with safety margin against line transients, and its 30A non-repetitive surge rating (8.3ms half-sine) accommodates cold-start inrush in capacitive-input designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600 V - Withstands peak reverse voltage up to 600V, enabling use in 400VDC bus and universal AC input stages. |
| IF(AV) | 1.0 A @ TA = +75°C - Continuous average forward current rating under standard PCB mounting (9.5mm lead length). |
| VFM | 1.2 V @ IF = 1.0A - Low conduction loss reduces heat generation in high-duty-cycle rectifiers. |
| tRR | 200 ns - Fast recovery minimizes reverse recovery charge (Qrr), critical for reducing switching losses in 50–100kHz converters. |
| IRM | 5.0 µA @ 25°C, 100 µA @ 100°C - Low leakage preserves efficiency in high-temperature environments and standby modes. |
| RθJA | 100 °C/W - Thermal resistance defines junction-to-ambient rise per watt; requires adequate copper area or heatsinking above ~0.5W dissipation. |
Pinout & Package
Package: DO-41 molded plastic case (UL 94V-0), axial leads, cathode band marking. Weight ≈ 0.35 g. Moisture sensitivity level 1.
| 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 terminal | Marked by colored band; ties to positive rail in half-wave or bridge configurations; determines direction of rectified output. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery (200ns) | Enables efficient operation in 50–100kHz switch-mode power supplies without excessive Qrr-related losses. |
| 600V VRRM rating | Supports universal AC input (85–265VAC) with >2× safety margin over peak line voltage (≈375V). |
| 30A IFSM surge capability | Withstands cold-start inrush into bulk capacitors without degradation in typical 115/230VAC systems. |
| Low 1.2V VFM at 1A | Reduces conduction loss to ~1.2W at full load, easing thermal design versus higher-VF alternatives like 1N4007. |
Applications
| AC/DC Adapter Input Rectification | Industrial DC-DC Converter Front-End |
|---|---|
Use Scenario: Rectifying 50/60Hz AC from wall outlet into unregulated DC for downstream flyback or buck converter. IC Role / Device Role / Timing Role: Power semiconductor rectifier in single-phase half-wave or bridge configuration. Use Value: 600V VRRM ensures margin against 375V peak line voltage and transient spikes; 200ns tRR avoids excessive loss when paired with 65kHz flyback controllers. | Use Scenario: Converting 3-phase rectified DC (e.g., 540VDC) to isolated 24V/48V for PLC I/O modules. IC Role / Device Role / Timing Role: Input-stage fast recovery diode in boost PFC or auxiliary supply rectifier. Use Value: 30A IFSM handles motor drive startup surges; DO-41 package allows manual rework and fits legacy industrial PCB footprints. |
| LED Driver Bulk Capacitor Charging | UPS Battery Charger Input Stage |
Use Scenario: Charging bulk electrolytic capacitor after bridge rectifier in constant-current LED driver. IC Role / Device Role / Timing Role: Secondary-side fast recovery diode in voltage-doubler or capacitor-input filter. Use Value: Low 5.0µA IRM at 25°C prevents capacitor self-discharge during standby; 1.2V VFM limits no-load power loss. | Use Scenario: Rectifying AC mains to charge sealed lead-acid battery banks in line-interactive UPS units. IC Role / Device Role / Timing Role: Primary rectifier in transformer-isolated charger topology. Use Value: 100°C/W RθJA permits operation at 75°C ambient with minimal heatsinking; RoHS-compliant finish meets industrial environmental compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RS1M | Same DO-41 package, 1.0A/1000V VRRM, 1.3V VFM, 500ns tRR | Higher voltage rating but slower recovery; suitable where surge margin >600V is required but switching frequency <30kHz | Select RS1M only if system requires >600V blocking with no penalty on tRR-driven loss. |
| FR107 | DO-41, 1.0A/1000V, 1.7V VFM, 500ns tRR, higher IRM (50µA @ 25°C) | Higher VF increases conduction loss; slower tRR raises switching loss in >50kHz designs | Prefer FR107 only in cost-sensitive, low-frequency (<20kHz), non-thermally constrained applications. |
Compared with RS1M and FR107, the 1N4937L delivers optimal balance of 600V rating, 200ns tRR, and 1.2V VFM-making it preferred for 50–100kHz offline SMPS where efficiency and thermal management are critical.
Availability
1N4937L is available at Aetrix Electronics and suitable for AC/DC adapters, industrial DC-DC converters, LED drivers, and UPS battery chargers requiring stable component supply and long-term manufacturing continuity.
Supply support for 1N4937L 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 1N4933–1N4937 series belongs to Diodes' general-purpose fast recovery rectifier product line, engineered for cost-effective, reliable AC/DC conversion in consumer, industrial, and computing power supplies.
FAQ
What is the maximum operating temperature for the 1N4937L?
The 1N4937L has an operating junction temperature range of –65°C to +150°C. Its thermal resistance is 100°C/W (junction-to-ambient, PCB-mounted with 9.5mm lead length), so sustained power dissipation above 0.75W requires thermal relief via copper pour or forced air to avoid exceeding TJ(max).
Is the 1N4937L RoHS compliant and lead-free?
Yes, the 1N4937L features a lead-free finish and complies with EU RoHS Directives 2002/95/EC, 2011/65/EU, and 2015/863/EU. Its terminals are bright tin-plated and solderable per MIL-STD-202, Method 208, with moisture sensitivity level 1 per J-STD-020.
How does the 1N4937L differ from the 1N4007 in practical design?
The 1N4937L offers 200ns reverse recovery vs. 30µs for the 1N4007, making it suitable for switching frequencies up to 100kHz. It also has lower VFM (1.2V vs. 1.7V at 1A), reducing conduction loss by ~0.5W. However, both share DO-41 packaging and 1A average current rating.
Can the 1N4937L be used in a full-wave bridge configuration?
Yes-the 1N4937L is a single-junction axial diode with defined anode/cathode polarity and can be used as any leg in a discrete full-wave bridge rectifier. Its 600V VRRM and 30A IFSM make it appropriate for bridges handling up to 265VAC input, provided layout maintains thermal isolation and creepage distances.
1N4937L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N4937L through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4937L 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 reliable?
The price and inventory of 1N4937L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4937L is usually 5 days.
3.What payment methods are accepted for 1N4937L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4937L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4937L?
1N4937L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4937L 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?
For technical support, including 1N4937L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4937L requirements.
6.How does Aetrix verify that 1N4937L is sourced from the original manufacturer or authorized distributors?
All 1N4937L 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 meets industry standards.
7.What is the process for return or replacement of 1N4937L?
All 1N4937L units undergo pre-shipment inspection (PSI). If there is an issue with 1N4937L, 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 part is unused and in its original packaging.
Return procedure for 1N4937L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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