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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation 1N4937G

Name: 1N4937G
Brand: Taiwan Semiconductor Corporation
SKU: 1N4937G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4937G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N4937G.pdf

Description:: DIODE GEN PURP 600V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:10,000

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Product details

Overview

1N4937G from Taiwan Semiconductor is a 1 A, 600 V fast recovery rectifier diode in DO-204AL (DO-41) package, featuring 200 ns reverse recovery time, 1.2 V forward voltage at 1 A, and 30 A surge current capability; used in switching-mode power supplies and DC-DC converters requiring high-voltage rectification with low conduction loss.

For engineers reviewing the 1N4937G datasheet, 1N4937G pinout, 1N4937G application, or 1N4937G equivalent, key selection criteria include peak reverse voltage rating, forward voltage drop at rated current, thermal resistance, reverse recovery performance, and AEC-Q101 qualification status for automotive-grade reliability.

Technical Context

This discrete silicon PN junction rectifier operates as a unidirectional current switch with fast recovery characteristics optimized for high-frequency switching applications. Its 600 V V_RRM, 200 ns t_rr, and 1.2 V V_F at 1 A enable efficient energy transfer in flyback and forward converter topologies.

The device uses a single-die construction in a DO-204AL (DO-41) molded package with pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; junction-to-ambient thermal resistance is 65 °C/W under standard PCB mounting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - maximum repetitive reverse blocking voltage without breakdown
I_F	1 A - continuous average forward current rating at 75 °C ambient
t_rr	200 ns - time to transition from forward conduction to reverse blocking state
V_F	1.2 V @ 1 A, 25 °C - forward voltage drop determining conduction loss and thermal load
I_FSM	30 A - non-repetitive surge current handling capability (8.3 ms half-sine)
R_θJA	65 °C/W - thermal resistance defining junction temperature rise per watt of dissipated power
Junction Temp	–55 °C to +150 °C - operational temperature range limiting design margins and derating curves

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case with cathode band marking polarity. Leads are pure tin-plated and solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of rectified circuit; determines forward bias direction
Cathode	Forward current exit point	Marked by band; connected to higher-potential output node; defines polarity of DC output

Key Features

Feature	Design Value
Fast recovery time	200 ns enables operation up to ~500 kHz in SMPS without excessive switching loss
Low forward voltage	1.2 V at 1 A reduces conduction loss and improves efficiency in 12–48 V output stages
High surge current rating	30 A I_FSM supports inrush and transient overload conditions in industrial power supplies
AEC-Q101 qualified option	1N4937GH variant meets stress test requirements for automotive under-hood applications
Halogen-free & RoHS	Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained designs

Applications

AC-DC Front-End Rectification	DC-DC Converter Output Stage
Use Scenario: Input rectification in offline 85–265 V AC adapters and industrial power supplies. IC Role / Device Role / Timing Role: Unidirectional current switch converting AC input to pulsating DC prior to bulk filtering. Use Value: 600 V V_RRM provides 2× safety margin over 265 V AC peak (375 V), ensuring robustness against line surges.	Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs. IC Role / Device Role / Timing Role: Synchronous or freewheeling rectifier managing high-frequency transformer secondary current. Use Value: 200 ns t_rr minimizes reverse recovery charge loss during switching transitions, improving overall conversion efficiency.
Automotive Power Modules	Industrial Motor Drive Snubbers
Use Scenario: Auxiliary power supply rectification in engine control units (ECUs) and body control modules (BCMs). IC Role / Device Role / Timing Role: High-reliability rectifier in 12/24 V battery-fed systems exposed to load dump transients. Use Value: AEC-Q101-qualified 1N4937GH variant withstands –40 °C to +150 °C operation and mechanical shock per automotive standards.	Use Scenario: Snubber network clamping in IGBT-based variable frequency drives (VFDs) and servo amplifiers. IC Role / Device Role / Timing Role: Fast-turn-off clamp diode absorbing inductive kickback energy during switching events. Use Value: 30 A I_FSM and 65 °C/W R_θJA allow reliable energy absorption without thermal runaway under repeated surge conditions.

AC-DC Front-End Rectification

DC-DC Converter Output Stage

Use Scenario: Input rectification in offline 85–265 V AC adapters and industrial power supplies.

IC Role / Device Role / Timing Role: Unidirectional current switch converting AC input to pulsating DC prior to bulk filtering.

Use Value: 600 V V_RRM provides 2× safety margin over 265 V AC peak (375 V), ensuring robustness against line surges.

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs.

IC Role / Device Role / Timing Role: Synchronous or freewheeling rectifier managing high-frequency transformer secondary current.

Use Value: 200 ns t_rr minimizes reverse recovery charge loss during switching transitions, improving overall conversion efficiency.

Automotive Power Modules

Industrial Motor Drive Snubbers

Use Scenario: Auxiliary power supply rectification in engine control units (ECUs) and body control modules (BCMs).

IC Role / Device Role / Timing Role: High-reliability rectifier in 12/24 V battery-fed systems exposed to load dump transients.

Use Value: AEC-Q101-qualified 1N4937GH variant withstands –40 °C to +150 °C operation and mechanical shock per automotive standards.

Use Scenario: Snubber network clamping in IGBT-based variable frequency drives (VFDs) and servo amplifiers.

IC Role / Device Role / Timing Role: Fast-turn-off clamp diode absorbing inductive kickback energy during switching events.

Use Value: 30 A I_FSM and 65 °C/W R_θJA allow reliable energy absorption without thermal runaway under repeated surge 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
STTH1R06	V_RRM = 600 V, t_rr = 150 ns, V_F = 1.15 V @ 1 A - faster recovery and slightly lower VF	Optimized for higher-frequency (>1 MHz) PFC stages where lower Q_rr reduces EMI	Select when minimizing reverse recovery charge is critical; requires verification of DO-41 footprint compatibility
ON Semi MUR106	V_RRM = 600 V, t_rr = 75 ns, V_F = 1.25 V @ 1 A - ultrafast recovery but higher forward drop	Suitable for resonant LLC and synchronous rectifier gate-drive snubbing where speed dominates loss trade-off	Prefer for <100 ns t_rr requirement; note higher V_F increases conduction loss at full load

Compared with STTH1R06 and MUR106, the 1N4937G offers balanced recovery speed and forward loss for cost-sensitive 100–500 kHz SMPS, with broader AEC-Q101 availability and proven field reliability in industrial power modules.

Availability

1N4937G is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converters, and automotive auxiliary power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 1N4937G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.

The 1N4933G–1N4937G family targets high-reliability, medium-power rectification in cost-constrained switching power supplies, emphasizing robust surge handling, thermal stability, and AEC-Q101 qualification for automotive subsystems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the 1N4937G?

The 1N4937G has a maximum repetitive peak reverse voltage (V_RRM) of 600 V, as confirmed in the Absolute Maximum Ratings table across all versions of the 1N4933G–1N4937G series. This rating ensures safe operation under worst-case AC line transients and reflected voltages in off-line power supplies, provided appropriate derating is applied per thermal and layout constraints.

Is the 1N4937G suitable for automotive applications?

Yes - the 1N4937G is available in an AEC-Q101 qualified version designated 1N4937GH. While the base 1N4937G is not automotive-qualified, the GH suffix indicates full compliance with AEC-Q101 stress tests including temperature cycling, humidity bias, and mechanical shock, making it suitable for under-hood and chassis-mounted power modules where extended temperature range and reliability are required.

What is the reverse recovery time (t_rr) specification for the 1N4937G?

The 1N4937G has a maximum reverse recovery time (t_rr) of 200 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This value is consistent across the entire 1N4933G–1N4937G family and reflects its fast recovery rectifier classification, enabling efficient operation in switching frequencies up to several hundred kilohertz without excessive switching loss.

Does the 1N4937G have RoHS and halogen-free compliance?

Yes - the 1N4937G is RoHS compliant and halogen-free per IEC 61249-2-21. The device uses green epoxy molding compound and pure tin-plated leads, satisfying environmental regulations for consumer, industrial, and automotive electronics. Compliance is explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet revision I2104.

What package type does the 1N4937G use, and what are its mechanical features?

The 1N4937G uses the DO-204AL (DO-41) axial-leaded package. Key mechanical features include UL 94V-0 flammability-rated epoxy molding, cathode band polarity marking, 0.330 g typical weight, and J-STD-002-compliant tin-plated leads. Its standardized outline allows direct replacement in legacy through-hole power supply designs without footprint modification.

1N4937G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

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:: 10pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

Operating Temperature - Junction:: -55°C ~ 150°C

1N4937G FAQ

1.How can I place an order for 1N4937G through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4937G 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 reliable?

The price and inventory of 1N4937G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4937G is usually 5 days.

3.What payment methods are accepted for 1N4937G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4937G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4937G?

1N4937G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4937G 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?

For technical support, including 1N4937G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4937G requirements.

6.How does Aetrix verify that 1N4937G is sourced from the original manufacturer or authorized distributors?

All 1N4937G 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 meets industry standards.

7.What is the process for return or replacement of 1N4937G?

All 1N4937G units undergo pre-shipment inspection (PSI). If there is an issue with 1N4937G, 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 part is unused and in its original packaging.

Return procedure for 1N4937G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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