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

Taiwan Semiconductor Corporation 1N4937G-K

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

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Part No.:: 1N4937G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: 1N4937G-K.pdf

Description:: 200NS, 1A, 600V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

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Inventory:7,189

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Product details

Overview

1N4937G-K from Taiwan Semiconductor is a single-die fast recovery rectifier diode rated for 600 V repetitive peak reverse voltage (V_RRM), 1 A average forward current (I_F), and 30 A non-repetitive surge current (I_FSM), used in high-efficiency DC-DC converters and switching-mode inverters.

For engineers reviewing the 1N4937G-K datasheet, 1N4937G-K pinout, 1N4937G-K application, or 1N4937G-K equivalent, key selection criteria include its 200 ns reverse recovery time (t_rr), 1.2 V max forward voltage at 1 A, 5 µA max reverse leakage at 25°C, DO-41 package thermal resistance of 65°C/W, and RoHS/halogen-free compliance.

Technical Context

The 1N4937G-K is a silicon planar epitaxial fast recovery rectifier with a single-junction structure optimized for high-frequency switching applications. Its 200 ns reverse recovery time enables efficient operation in SMPS topologies up to several hundred kHz.

It features a DO-204AL (DO-41) axial leaded package with pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance, operating across -55°C to +150°C junction temperature range.

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 at 75°C ambient with free-air mounting
t_rr	200 ns - time to transition from conduction to full blocking under specified test conditions (IF=0.5A, IR=1.0A)
V_F max	1.2 V @ 1 A, 25°C - forward voltage drop determining conduction loss in power stage
I_R max	5 µA @ 25°C - reverse leakage current affecting standby power and voltage hold-off integrity
R_θJA	65 °C/W - junction-to-ambient thermal resistance defining temperature rise per watt dissipated

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case meeting UL 94V-0 flammability rating; cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry terminal	Connected to lower-potential side of rectified path; must withstand surge currents up to 30 A
Cathode	Forward current exit terminal	Marked with band; connected to output rail or filter capacitor; defines polarity in bridge or flyback configurations

Key Features

Feature	Design Value
Fast recovery time	200 ns - reduces switching losses and EMI in high-frequency SMPS designs
Low forward voltage	1.2 V max @ 1 A - minimizes conduction loss and thermal stress in compact layouts
High surge capability	30 A I_FSM - withstands inrush and transient overloads without failure
RoHS & halogen-free	Compliant per IEC 61249-2-21 - meets environmental requirements for industrial and consumer end equipment

Applications

DC-DC Converters	Switching Inverters
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs at up to 1 A. IC Role / Device Role / Timing Role: Unidirectional current switch converting high-frequency AC from transformer secondary into regulated DC. Use Value: 200 ns t_rr and 1.2 V V_F reduce power loss and thermal load compared to standard rectifiers.	Use Scenario: Output rectification in single-phase H-bridge inverters for motor drives or UPS systems. IC Role / Device Role / Timing Role: Fast-recovery freewheeling/commutation diode handling bidirectional reactive energy during PWM transitions. Use Value: 30 A I_FSM supports short-circuit robustness; DO-41 package allows manual or automated through-hole assembly.
AC-DC Adapters	Industrial Power Supplies
Use Scenario: Input bridge rectification in offline 85–265 VAC adapters powering IoT gateways or LED drivers. IC Role / Device Role / Timing Role: High-voltage input stage diode providing 600 V blocking margin above peak line voltage. Use Value: 600 V V_RRM ensures safety margin against transients; 5 µA I_R maintains low no-load consumption.	Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Reliable, long-life rectifier operating continuously at elevated ambient temperatures up to 75°C. Use Value: 150°C T_JMAX and 65°C/W R_θJA enable stable operation without forced cooling in enclosed enclosures.

DC-DC Converters

Switching Inverters

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs at up to 1 A.

IC Role / Device Role / Timing Role: Unidirectional current switch converting high-frequency AC from transformer secondary into regulated DC.

Use Value: 200 ns t_rr and 1.2 V V_F reduce power loss and thermal load compared to standard rectifiers.

Use Scenario: Output rectification in single-phase H-bridge inverters for motor drives or UPS systems.

IC Role / Device Role / Timing Role: Fast-recovery freewheeling/commutation diode handling bidirectional reactive energy during PWM transitions.

Use Value: 30 A I_FSM supports short-circuit robustness; DO-41 package allows manual or automated through-hole assembly.

AC-DC Adapters

Industrial Power Supplies

Use Scenario: Input bridge rectification in offline 85–265 VAC adapters powering IoT gateways or LED drivers.

IC Role / Device Role / Timing Role: High-voltage input stage diode providing 600 V blocking margin above peak line voltage.

Use Value: 600 V V_RRM ensures safety margin against transients; 5 µA I_R maintains low no-load consumption.

Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules.

IC Role / Device Role / Timing Role: Reliable, long-life rectifier operating continuously at elevated ambient temperatures up to 75°C.

Use Value: 150°C T_JMAX and 65°C/W R_θJA enable stable operation without forced cooling in enclosed enclosures.

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	Same 600 V V_RRM, 1 A I_F, but 150 ns t_rr; TO-220AC package	Higher thermal mass and heatsink compatibility; unsuitable for space-constrained DO-41 footprints	Select when lower recovery time justifies larger footprint and thermal management overhead
ON Semi MUR160	600 V V_RRM, 1 A I_F, 75 ns t_rr; same DO-41 package	Superior speed but higher V_F (1.3 V typ); tighter leakage spec (2.5 µA max)	Prefer where ultra-fast recovery outweighs marginal conduction loss increase

Compared with STTH1R06 and MUR160, the 1N4937G-K offers balanced performance in the DO-41 form factor-delivering adequate 200 ns recovery for mid-frequency SMPS while maintaining low V_F and proven reliability in cost-sensitive industrial adapters.

Availability

1N4937G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply with consistent DO-41 mechanical fit and electrical performance.

Supply support for 1N4937G-K 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 semiconductor manufacturer specializing in discrete power devices, analog ICs, and optoelectronics for industrial and consumer markets.

The 1N493xG-K series was designed specifically for high-reliability, cost-optimized fast recovery rectification in mainstream switching power supplies, balancing speed, ruggedness, and manufacturability in legacy through-hole packages.

FAQ

What is the maximum junction temperature rating for the 1N4937G-K?

The 1N4937G-K has a maximum junction temperature (T_JMAX) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet revision B2104. This rating applies under steady-state conditions with appropriate thermal management. Operation beyond this limit risks irreversible degradation of the silicon die and packaging integrity. Derating curves in the datasheet define safe I_F limits at elevated ambient temperatures.

Does the 1N4937G-K meet RoHS and halogen-free requirements?

Yes, the 1N4937G-K is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor datasheet (B2104). The device uses green epoxy molding compound and pure tin-plated leads, satisfying both environmental directives and solderability standards including J-STD-002.

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

The 1N4937G-K has a maximum reverse recovery time (t_rr) of 200 ns, measured under the condition IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per the Electrical Specifications table in the official datasheet. This value is typical for fast recovery rectifiers in the DO-41 package and directly impacts switching loss in high-frequency power converters.

Can the 1N4937G-K replace a standard 1N4007 in a switching power supply?

No-the 1N4937G-K is not a direct replacement for the 1N4007 in all cases. While both share the DO-41 package and 1 A rating, the 1N4937G-K's 200 ns t_rr makes it suitable for switching supplies, whereas the 1N4007's 30 µs t_rr causes excessive loss and heating above ~10 kHz. Use 1N4937G-K only where fast recovery is required and layout accounts for its higher dV/dt sensitivity.

What is the marking code on the 1N4937G-K device body?

The 1N4937G-K is marked "1N4937G" on the device body, as specified in the Absolute Maximum Ratings table of the Taiwan Semiconductor datasheet (B2104). The "G" suffix denotes green compound, and the "K" in the ordering code indicates tape-and-reel packaging (5,000 units per reel); the date and factory codes follow standard TSC conventions.

1N4937G-K 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-K FAQ

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

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

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

3.What payment methods are accepted for 1N4937G-K?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4937G-K?

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

Once your 1N4937G-K 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-K?

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

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

All 1N4937G-K 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-K meets industry standards.

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

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

Return procedure for 1N4937G-K:

1.Submit a request within 90 days.

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

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