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Diodes Incorporated 1N4937G-T
- Part No.:
- 1N4937G-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4937G-T.pdf
- Description:
- DIODE GEN PURP 600V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,027
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Product details
Overview
1N4937G-T from Diodes Incorporated is a 1.0A fast recovery glass passivated rectifier diode in DO-41 package, rated for 600V peak repetitive reverse voltage (VRRM), 1.2V forward voltage at 1.0A, and 200ns reverse recovery time - used in AC/DC input stage rectification for offline switch-mode power supplies.
For engineers reviewing the 1N4937G-T datasheet, 1N4937G-T pinout, 1N4937G-T application, or 1N4937G-T equivalent, key selection criteria include VRRM derating for capacitive loads, thermal management under 75°C ambient, surge capability up to 30A (8.3ms), and RoHS-compliant tin-plated leads for automated assembly.
Technical Context
This discrete rectifier employs a diffused junction and glass passivated die construction to achieve fast switching with low conduction loss and high reliability in unidirectional current conversion. Its 200ns trr enables efficient operation in 50–60Hz line-frequency and higher-frequency flyback auxiliary windings.
The device supports 1.0A average forward current at TA = 75°C with 100K/W junction-to-ambient thermal resistance, and withstands non-repetitive 30A surge peaks - critical for handling inrush currents in industrial power adapters and LED drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600V - blocks full-wave rectified 420V RMS mains without breakdown, suitable for universal-input SMPS front ends. |
| IF(AV) | 1.0A @ TA = 75°C - delivers continuous DC output current when leads are held at ambient at 9.5mm from case. |
| VF | 1.2V @ IF = 1.0A - limits conduction loss to 1.2W per diode, reducing heatsink requirements in compact designs. |
| trr | 200ns - minimizes switching loss and EMI during turn-off in high-frequency auxiliary supplies. |
| IFSM | 30A (8.3ms half-sine) - survives cold-start surges in AC-input power stages without failure. |
| Cj | 15pF @ 4V, 1MHz - contributes negligible capacitive loading in snubberless clamp circuits. |
| RθJA | 100K/W - defines thermal rise under PCB-mounted conditions; requires layout-aware copper pour for sustained 1A operation. |
Pinout & Package
Package: DO-41 molded plastic case (UL 94V-0), cathode indicated by band, lead finish: bright tin, weight ≈ 0.35g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | AC input connection point | Accepts incoming alternating waveform; must be routed with adequate creepage for 600V isolation. |
| Cathode | DC output connection point | Delivers unidirectional current to bulk capacitor; polarity marking ensures correct orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enhances moisture resistance and long-term stability in humid industrial environments. |
| Diffused junction | Provides soft reverse recovery characteristics, reducing voltage overshoot and RFI generation. |
| 30A surge rating | Eliminates need for external NTC thermistors in cost-sensitive AC-input protection schemes. |
| RoHS-compliant tin plating | Ensures compatibility with lead-free reflow profiles and eliminates post-solder cleaning steps. |
Applications
| AC/DC Power Adapter Input Stage | LED Driver Bulk Rectification |
|---|---|
Use Scenario: Converts 100–240V AC mains to pulsating DC before bulk capacitor filtering in Class II isolated LED drivers. IC Role / Device Role / Timing Role: Unidirectional current valve enabling energy transfer to storage capacitor; no timing function. Use Value: 600V VRRM accommodates 240VAC + 20% tolerance with margin; 1.2V VF reduces heat generation in enclosed luminaires. | Use Scenario: Rectifies transformer secondary output in low-cost constant-voltage LED drivers for street lighting. IC Role / Device Role / Timing Role: Passive rectifying element in bridge or single-phase configuration; operates at line frequency only. Use Value: 200ns trr prevents excessive ringing in transformer-coupled outputs, improving EMI compliance. |
| Industrial Control Power Supply | Appliance Auxiliary Power Supply |
Use Scenario: Provides isolated 12V/24V bias supply for PLC I/O modules operating in factory-floor environments. IC Role / Device Role / Timing Role: Primary-side rectifier feeding linear regulator or buck converter; handles 50/60Hz ripple. Use Value: 30A IFSM sustains repeated motor-start transients without degradation over 10-year service life. | Use Scenario: Generates standby rail in washing machine mainboard power section with frequent on/off cycling. IC Role / Device Role / Timing Role: Line-frequency rectifier in half-wave or full-wave configuration; no signal processing role. Use Value: Glass passivation prevents leakage current drift under condensation-prone kitchen/humidity conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06U | TO-220AC package, 600V VRRM, 1.05V VF @ 1A, 150ns trr | Higher thermal mass enables >1A continuous at higher ambient; requires heatsink mounting. | Select when board space allows TO-220 and higher surge robustness is needed beyond 30A. |
| ON Semi MUR160 | DO-41, 600V VRRM, 1.15V VF @ 1A, 75ns trr, 50A IFSM | Faster recovery reduces EMI in noise-sensitive audio equipment; higher surge rating adds margin. | Prefer where faster switching and lower VF improve efficiency in battery-charger auxiliary supplies. |
Compared with STTH1R06U and MUR160, the 1N4937G-T offers lowest profile and simplest assembly in DO-41 footprint, balancing cost, size, and proven reliability for mainstream industrial and consumer power supplies - without requiring heatsinks or complex layout.
Availability
1N4937G-T is available at Aetrix Electronics and suitable for AC/DC power adapter input stage, LED driver bulk rectification, and industrial control power supply requiring stable component supply and RoHS-compliant manufacturing.
Supply support for 1N4937G-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 and signal integrity solutions for industrial, computing, and consumer markets.
The 1N493xG series targets cost-sensitive, high-volume rectification applications where fast recovery, surge resilience, and regulatory compliance are essential - particularly in off-line power conversion.
FAQ
What is the maximum allowable ambient temperature for continuous 1.0A operation?
The 1N4937G-T is rated for 1.0A average forward current at TA = 75°C, provided leads are maintained at ambient temperature at 9.5mm from the case. At 25°C ambient, derating curves show it can sustain ~1.3A; above 75°C, current must be reduced per Figure 1 - e.g., to 0.7A at 100°C ambient.
Can the 1N4937G-T replace a standard 1N4007 in high-frequency applications?
No - while both are DO-41 rectifiers, the 1N4007 has 30µs reverse recovery time versus 200ns for the 1N4937G-T. Using 1N4007 in switch-mode or high-frequency auxiliary supplies causes excessive switching loss, overheating, and EMI; the 1N4937G-T's fast recovery is essential for such roles.
Is the 1N4937G-T suitable for use in a capacitive-input filter configuration?
No - the datasheet explicitly states "for capacitive load, derate current by 20%". In capacitive-input rectifiers, peak current stresses the diode beyond its average rating; using 1N4937G-T here risks premature failure unless IF(AV) is limited to 0.8A and surge margins are verified.
Does the cathode band indicate polarity during PCB layout?
Yes - the black cathode band marks the cathode terminal, which must connect toward the positive side of the DC output (e.g., bulk capacitor anode). Incorrect orientation results in open-circuit behavior and no output voltage; the band aligns with silkscreen polarity markings on standard footprints.
1N4937G-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4937G-T FAQ
1.How can I place an order for 1N4937G-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4937G-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 1N4937G-T reliable?
The price and inventory of 1N4937G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4937G-T is usually 5 days.
3.What payment methods are accepted for 1N4937G-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4937G-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4937G-T?
1N4937G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4937G-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 1N4937G-T?
For technical support, including 1N4937G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4937G-T requirements.
6.How does Aetrix verify that 1N4937G-T is sourced from the original manufacturer or authorized distributors?
All 1N4937G-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 1N4937G-T meets industry standards.
7.What is the process for return or replacement of 1N4937G-T?
All 1N4937G-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4937G-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 1N4937G-T part is unused and in its original packaging.
Return procedure for 1N4937G-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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