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

Taiwan Semiconductor Corporation 1N4934G-K

Name: 1N4934G-K
Brand: Taiwan Semiconductor Corporation
SKU: 1N4934G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4934G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: 1N4934G-K.pdf

Description:: 200NS, 1A, 100V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

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Inventory:5,698

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Product details

Overview

1N4934G-K from Taiwan Semiconductor is a 1A, 100V 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 capability. It serves as the primary AC-to-DC conversion element in compact switching power supplies.

For engineers reviewing the 1N4934G-K datasheet, 1N4934G-K pinout, 1N4934G-K application, or 1N4934G-K equivalent, key selection criteria include V_RRM = 100 V, I_F = 1 A, t_rr = 200 ns, thermal resistance R_θJA = 65 °C/W, and DO-41 mechanical compatibility with through-hole PCB layouts.

Technical Context

This discrete silicon rectifier uses a single-die planar junction structure optimized for fast switching in high-frequency DC/DC converters. Its 200 ns reverse recovery time enables operation up to ~100 kHz without excessive switching loss, while the 1.2 V V_F at 1 A balances conduction efficiency and thermal rise under continuous load.

The device operates across –55°C to +150°C junction temperature range and sustains 30 A non-repetitive surge current (8.3 ms half-sine), making it suitable for transient-heavy input stages. Its DO-41 package provides standardized lead spacing (2.54 mm) and meets UL 94V-0 flammability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; defines safe operating limit in bridge or flyback clamp circuits
I_F	1 A - Continuous forward current rating; determines minimum heatsinking for steady-state 12 W conduction loss (1.2 V × 1 A)
t_rr	200 ns - Reverse recovery time; limits maximum practical switching frequency to ~100 kHz in hard-switched topologies
V_F	1.2 V @ 1 A, 25°C - Forward voltage drop; directly sets conduction loss and thermal load in rectification path
R_θJA	65 °C/W - Junction-to-ambient thermal resistance; requires ≤ 45°C ambient rise for 150°C max junction temp at full load
I_FSM	30 A - Peak non-repetitive surge current; supports cold-start inrush and line-voltage transients without failure
C_J	10 pF @ 4 V - Junction capacitance; contributes to high-frequency switching noise and EMI in snubberless designs

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC source or transformer secondary; must withstand full surge current and reverse blocking stress
Cathode	Forward current exit / reverse voltage reference	Marked by band; ties to output capacitor or ground return; carries full load current and defines output polarity

Key Features

Feature	Design Value
Fast recovery (t_rr ≤ 200 ns)	Enables efficient operation in 50–100 kHz SMPS without significant switching loss penalty
Low forward voltage (V_F ≤ 1.2 V)	Reduces conduction loss to ≤1.2 W at 1 A, easing thermal management in space-constrained adapters
High surge rating (I_FSM = 30 A)	Withstands repeated cold-start surges and lightning-induced line transients in off-line power inputs
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and global environmental regulations for industrial and consumer end equipment

Applications

AC/DC Adapter Input Rectification	DC/DC Converter Output Rectification
Use Scenario: Converting 90–264 V_AC mains to bulk DC in wall-wart adapters rated ≤15 W. IC Role / Device Role / Timing Role: Primary rectifier in voltage-doubler or bridge configuration; handles full input current and peak inverse voltage. Use Value: 100 V V_RRM safely covers 1.4× 70 V_DC doubler output; 200 ns t_rr minimizes switching loss during 65 kHz PWM cycles.	Use Scenario: Synchronous or diode-based rectification on secondary side of isolated flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated 3.3–24 V DC output; blocks reverse current during MOSFET off-time. Use Value: 1.2 V V_F limits output-stage loss to <1.2 W; DO-41 leads allow manual rework and standard wave-solder compatibility.
Industrial Sensor Power Supply	LED Driver Bulk Rectification
Use Scenario: Providing isolated 12–24 V DC for analog sensor modules in factory automation systems. IC Role / Device Role / Timing Role: Input rectifier in small enclosed DIN-rail power supply; operates continuously at 0.6–0.8 A load. Use Value: 150°C max junction temperature and –55°C min storage enable deployment in unventilated enclosures; 65 °C/W R_θJA allows natural convection cooling.	Use Scenario: Rectifying 120/230 V_AC input in constant-current LED drivers for commercial lighting. IC Role / Device Role / Timing Role: First-stage rectifier feeding bulk capacitor; subjected to high ripple current and line surges. Use Value: 30 A I_FSM withstands repeated 10× overcurrent events during lamp hot-plug; RoHS/halogen-free status satisfies IEC 62471 photobiological safety compliance.

AC/DC Adapter Input Rectification

DC/DC Converter Output Rectification

Use Scenario: Converting 90–264 V_AC mains to bulk DC in wall-wart adapters rated ≤15 W.

IC Role / Device Role / Timing Role: Primary rectifier in voltage-doubler or bridge configuration; handles full input current and peak inverse voltage.

Use Value: 100 V V_RRM safely covers 1.4× 70 V_DC doubler output; 200 ns t_rr minimizes switching loss during 65 kHz PWM cycles.

Use Scenario: Synchronous or diode-based rectification on secondary side of isolated flyback or forward converters.

IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated 3.3–24 V DC output; blocks reverse current during MOSFET off-time.

Use Value: 1.2 V V_F limits output-stage loss to <1.2 W; DO-41 leads allow manual rework and standard wave-solder compatibility.

Industrial Sensor Power Supply

LED Driver Bulk Rectification

Use Scenario: Providing isolated 12–24 V DC for analog sensor modules in factory automation systems.

IC Role / Device Role / Timing Role: Input rectifier in small enclosed DIN-rail power supply; operates continuously at 0.6–0.8 A load.

Use Value: 150°C max junction temperature and –55°C min storage enable deployment in unventilated enclosures; 65 °C/W R_θJA allows natural convection cooling.

Use Scenario: Rectifying 120/230 V_AC input in constant-current LED drivers for commercial lighting.

IC Role / Device Role / Timing Role: First-stage rectifier feeding bulk capacitor; subjected to high ripple current and line surges.

Use Value: 30 A I_FSM withstands repeated 10× overcurrent events during lamp hot-plug; RoHS/halogen-free status satisfies IEC 62471 photobiological safety 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
STTH1R04	V_RRM = 400 V, t_rr = 35 ns, V_F = 1.15 V @ 1 A - higher voltage rating and faster recovery	Preferred in 230 V_AC input designs requiring margin above 300 V PIV; lower V_F reduces heat in thermally constrained LED drivers	Select when higher PIV margin or sub-50 ns t_rr is required; not drop-in due to different TO-220AC footprint
ON Semi MUR110E	V_RRM = 100 V, t_rr = 75 ns, V_F = 0.92 V @ 1 A - significantly faster and lower V_F, same package	Better suited for high-efficiency 65–130 kHz adapters where conduction and switching losses must both be minimized	Direct DO-41 replacement with improved performance; verify layout clearance for slightly higher thermal dissipation density

Compared with STTH1R04 and MUR110E, the 1N4934G-K offers cost-optimized 100 V rectification with proven reliability in legacy adapter designs, while trading speed and V_F for broader manufacturing availability and long-term supply stability in DO-41 form factor.

Availability

1N4934G-K is available at Aetrix Electronics and suitable for AC/DC adapters, industrial sensor power supplies, and LED driver bulk rectification requiring stable component supply and long-lifecycle support.

Supply support for 1N4934G-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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power management and industrial markets since 1979.

The 1N493xG-K series belongs to TSC's general-purpose fast recovery rectifier product line, engineered for cost-sensitive, high-volume AC/DC and DC/DC power conversion applications demanding reliability and consistent parametric performance.

FAQ

What is the maximum junction temperature rating for the 1N4934G-K?

The 1N4934G-K has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings table in Taiwan Semiconductor's B2104 datasheet. This rating applies under continuous DC forward current conditions and permits operation in sealed enclosures up to 85°C ambient when derated per the forward current derating curve. The 1N4934G-K maintains stable electrical parameters within this thermal envelope.

Is the 1N4934G-K RoHS and halogen-free compliant?

Yes, the 1N4934G-K is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the "Features" section of the official datasheet. The molding compound is UL 94V-0 rated, and the pure tin-plated leads meet J-STD-002 solderability standards. These qualifications are confirmed for the 1N4934G-K variant and apply to all units shipped under the -K suffix.

What does the 'G' and 'K' suffix mean in 1N4934G-K?

In 1N4934G-K, the 'G' denotes green (halogen-free) molding compound per TSC internal coding, and the 'K' indicates tape-and-reel packaging (5,000 units per reel). This suffixing convention is consistent across the 1N4933G-K to 1N4937G-K family and is documented in the "Ordering Information" section of the B2104 datasheet. The 'K' does not indicate a revised die or process.

Can the 1N4934G-K replace the 1N4004 in a design?

The 1N4934G-K can replace the 1N4004 only if the application requires faster recovery (200 ns vs. 30 µs) and higher surge rating (30 A vs. 30 A), but note that V_RRM is identical (100 V). However, the 1N4934G-K's lower V_F (1.2 V vs. 1.1 V typical) and tighter parameter distribution make it preferable in switching supplies, whereas the 1N4004 remains suitable for low-frequency linear supplies. Verify thermal design due to differing t_rr-related losses.

What is the reverse leakage current specification for the 1N4934G-K at 125°C?

At 125°C junction temperature and rated reverse voltage (100 V), the 1N4934G-K exhibits a maximum reverse leakage current (I_R) of 150 µA, as specified in the "Electrical Specifications" table of the B2104 datasheet. This value is measured under pulse conditions (PW = 30 ms) and represents worst-case behavior; typical units show <50 µA at this condition. The 1N4934G-K maintains this spec across its qualified lot production.

1N4934G-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):: 100 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 @ 100 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

1N4934G-K FAQ

1.How can I place an order for 1N4934G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4934G-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 1N4934G-K reliable?

The price and inventory of 1N4934G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4934G-K is usually 5 days.

3.What payment methods are accepted for 1N4934G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4934G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4934G-K?

1N4934G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4934G-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 1N4934G-K?

For technical support, including 1N4934G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4934G-K requirements.

6.How does Aetrix verify that 1N4934G-K is sourced from the original manufacturer or authorized distributors?

All 1N4934G-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 1N4934G-K meets industry standards.

7.What is the process for return or replacement of 1N4934G-K?

All 1N4934G-K units undergo pre-shipment inspection (PSI). If there is an issue with 1N4934G-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 1N4934G-K part is unused and in its original packaging.

Return procedure for 1N4934G-K:

1.Submit a request within 90 days.

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

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