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

Taiwan Semiconductor Corporation 1T4G

Name: 1T4G
Brand: Taiwan Semiconductor Corporation
SKU: 1T4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1T4G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: T-18, Axial

Datasheet:: 1T4G.pdf

Description:: DIODE GEN PURP 400V 1A TS-1

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

1T4G from Taiwan Semiconductor is a single-die standard silicon rectifier diode in TS-1 package, rated for 400 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 DC-DC converters and switching-mode power supplies.

For engineers reviewing the 1T4G datasheet, 1T4G pinout, 1T4G application, or 1T4G equivalent, key selection criteria include its 400 V V_RRM, 1.0 V max forward voltage at 1 A, 100 °C/W junction-to-ambient thermal resistance, TS-1 miniature package with cathode band polarity marking, and AEC-Q101 qualification option (1T4GH).

Technical Context

The 1T4G operates as a unidirectional power rectifier with PN junction architecture, optimized for high-reliability industrial and automotive-grade power conversion where low conduction loss and robust surge handling are required. Its 150 °C maximum junction temperature and JESD201 Class 2 whisker resistance support extended thermal cycling life.

Thermally, the TS-1 package delivers 100 °C/W R_θJA under standard JEDEC conditions, and electrically it exhibits ≤1.0 V forward voltage at I_F = 1 A and T_J = 25 °C, with reverse leakage ≤5 µA at 25 °C and ≤100 µA at 125 °C under rated V_R.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse blocking voltage before breakdown; defines usable input voltage range in AC/DC or DC-DC stages.
I_F	1 A - Continuous average forward current rating; sets maximum steady-state power delivery capability.
I_FSM	30 A - Peak non-repetitive surge current (8.3 ms half-sine); enables tolerance of startup inrush and transient overloads.
V_F @ 1 A, 25 °C	≤1.0 V - Forward voltage drop determines conduction loss and thermal dissipation in high-duty-cycle operation.
R_θJA	100 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements for ambient temperatures up to 75 °C at full load.
T_J max	150 °C - Maximum allowable junction temperature; constrains derating curves and long-term reliability in enclosed environments.
Package	TS-1 - 3 mm miniature molded case with pure tin-plated leads; supports automated SMT placement and reflow compatibility per J-STD-002.

Pinout & Package

TS-1 package: surface-mount, single-diode configuration with cathode indicated by a visible band on the body. Leads are gull-wing shaped, coplanar, and tin-plated for solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary or switch node) in rectification path.
Cathode	Forward current exit point	Marked with band; connects to output filter capacitor or positive rail; defines polarity-sensitive placement.

Key Features

Feature	Design Value
AEC-Q101 qualified variant available (1T4GH)	Validated for automotive power modules requiring stress-tested reliability under temperature cycling and humidity exposure.
Low forward voltage (≤1.0 V @ 1 A)	Reduces conduction loss by ~15% vs. comparable 1A rectifiers with >1.15 V V_F, improving efficiency in 5–24 V DC-DC outputs.
High surge rating (30 A, 8.3 ms)	Withstands repeated cold-start surges in offline SMPS without degradation, eliminating need for external NTC or fusing in many designs.
TS-1 3 mm miniature package	Enables compact board layout in space-constrained applications such as LED drivers and portable adapters while maintaining creepage/clearance compliance.
RoHS & halogen-free (IEC 61249-2-21)	Meets global environmental compliance mandates for industrial and consumer end equipment without compromising thermal or electrical performance.

Applications

AC-DC Adapter Rectification	Automotive DC-DC Converter Input Stage
Use Scenario: Rectifying 100–240 VAC input after bridge or transformer in universal-input wall adapters. IC Role / Device Role / Timing Role: Standard rectifier diode providing unidirectional current flow into bulk capacitor. Use Value: 400 V V_RRM ensures margin against line transients; 1.0 V V_F minimizes heat generation in sealed enclosures.	Use Scenario: Input rectification in 12 V to 5 V/3.3 V buck converters powering infotainment or ADAS sensors. IC Role / Device Role / Timing Role: High-reliability rectifier in front-end protection stage of automotive-grade DC-DC modules. Use Value: AEC-Q101-qualified version (1T4GH) supports automotive qualification; 150 °C T_J max accommodates under-hood ambient temperatures.
Industrial Switch-Mode Inverter Output Clamp	LED Driver Secondary-Side Rectification
Use Scenario: Clamping flyback energy and rectifying output in isolated gate-drive power supplies for IGBTs/MOSFETs. IC Role / Device Role / Timing Role: Freewheeling and output rectifier in high-frequency (50–200 kHz) isolated flyback converters. Use Value: 30 A I_FSM handles repetitive switching surges; TS-1 footprint allows dense layout near power switches.	Use Scenario: Secondary-side rectification in constant-current LED drivers for street lighting or commercial signage. IC Role / Device Role / Timing Role: Low-loss rectifier delivering stable DC to LED string with minimal thermal rise. Use Value: 1.0 V V_F reduces power loss at 350–700 mA operating currents; RoHS/halogen-free compliance meets lighting safety standards.

AC-DC Adapter Rectification

Automotive DC-DC Converter Input Stage

Use Scenario: Rectifying 100–240 VAC input after bridge or transformer in universal-input wall adapters.

IC Role / Device Role / Timing Role: Standard rectifier diode providing unidirectional current flow into bulk capacitor.

Use Value: 400 V V_RRM ensures margin against line transients; 1.0 V V_F minimizes heat generation in sealed enclosures.

Use Scenario: Input rectification in 12 V to 5 V/3.3 V buck converters powering infotainment or ADAS sensors.

IC Role / Device Role / Timing Role: High-reliability rectifier in front-end protection stage of automotive-grade DC-DC modules.

Use Value: AEC-Q101-qualified version (1T4GH) supports automotive qualification; 150 °C T_J max accommodates under-hood ambient temperatures.

Industrial Switch-Mode Inverter Output Clamp

LED Driver Secondary-Side Rectification

Use Scenario: Clamping flyback energy and rectifying output in isolated gate-drive power supplies for IGBTs/MOSFETs.

IC Role / Device Role / Timing Role: Freewheeling and output rectifier in high-frequency (50–200 kHz) isolated flyback converters.

Use Value: 30 A I_FSM handles repetitive switching surges; TS-1 footprint allows dense layout near power switches.

Use Scenario: Secondary-side rectification in constant-current LED drivers for street lighting or commercial signage.

IC Role / Device Role / Timing Role: Low-loss rectifier delivering stable DC to LED string with minimal thermal rise.

Use Value: 1.0 V V_F reduces power loss at 350–700 mA operating currents; RoHS/halogen-free compliance meets lighting safety standards.

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR140	400 V V_RRM, 1 A I_F, 30 A I_FSM, but TO-220AC package (larger, through-hole); V_F = 1.25 V typical at 1 A.	Requires PCB through-hole mounting and larger keep-out area; higher V_F increases conduction loss by ~250 mW at full load.	Select when legacy TO-220 layout exists or higher surge margin beyond 30 A is needed; not drop-in for TS-1 footprint.
Vishay VS-1EWH04-M3	400 V V_RRM, 1 A I_F, 30 A I_FSM, SOD-123FL package (smaller, 2.7 × 1.7 mm); V_F = 0.95 V max at 1 A.	Smaller footprint and lower V_F, but lower thermal mass limits sustained 1 A operation without copper pour; no AEC-Q101 variant.	Select for ultra-compact designs with aggressive thermal management; avoid in automotive or high-derating applications unless validated.

Compared with MUR140 and VS-1EWH04-M3, the 1T4G uniquely balances TS-1 SMT compatibility, 1.0 V V_F ceiling, AEC-Q101 availability, and proven 150 °C junction operation-making it optimal for new industrial and automotive power supply designs requiring reliability and manufacturability.

Availability

1T4G is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and general-purpose power rectification requiring stable component supply across industrial, automotive, and consumer electronics programs.

Supply support for 1T4G 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 industrial, automotive, and computing markets since 1979.

The 1T1G–1T7G series was designed specifically for cost-sensitive, high-volume power conversion applications demanding AEC-Q101 readiness, low-profile packaging, and consistent parametric performance across voltage grades.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the 1T4G?

The 1T4G has a V_RRM of 400 V, meaning it can reliably block up to 400 V of reverse voltage in repetitive operation without breakdown. This rating is confirmed in the Absolute Maximum Ratings table of the H2104 datasheet and applies specifically to the 1T4G variant-not the entire 1T1G–1T7G family. Designers must ensure system-level reverse transients remain within this limit.

Is the 1T4G available in an AEC-Q101 qualified version?

Yes-the AEC-Q101 qualified version of the 1T4G is designated as 1T4GH. It undergoes additional stress testing including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing per AEC-Q101 Rev D. The 1T4GH shares identical electrical and thermal specs with the standard 1T4G but adds automotive-grade reliability validation.

What is the forward voltage (V_F) specification for the 1T4G at 1 A and 25 °C?

The 1T4G has a maximum forward voltage of 1.0 V at I_F = 1 A and T_J = 25 °C, as specified in the Electrical Specifications table. This value is measured under pulse test conditions (PW = 0.3 ms) and represents the upper bound for conduction loss in typical operation-critical for thermal design in enclosed power supplies.

What package type does the 1T4G use, and what are its key mechanical features?

The 1T4G uses the TS-1 surface-mount package: a 3 mm miniature molded body with gull-wing leads, pure tin plating compliant with J-STD-002, UL 94V-0 molding compound, and cathode polarity marked by a visible band. Its weight is approximately 0.200 g, and it meets JESD201 Class 2 whisker resistance requirements.

How does the 1T4G's thermal resistance compare to similar 1 A rectifiers?

The 1T4G has a junction-to-ambient thermal resistance (R_θJA) of 100 °C/W under standard JEDEC test conditions. This is typical for TS-1 packaged rectifiers and aligns closely with alternatives like ON Semi's MUR140 (TO-220AC, R_θJA ≈ 65 °C/W with heatsink) and Vishay's VS-1EWH04-M3 (SOD-123FL, R_θJA ≈ 150–180 °C/W). Layout with ≥1 cm² copper pour improves 1T4G's effective R_θJA by ~25–30%.

1T4G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: T-18, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 1 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 10pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TS-1

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

1T4G FAQ

1.How can I place an order for 1T4G through Aetrix?

Please submit a Request for Quotation (RFQ) for 1T4G 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 1T4G reliable?

The price and inventory of 1T4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1T4G is usually 5 days.

3.What payment methods are accepted for 1T4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1T4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1T4G?

1T4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1T4G 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 1T4G?

For technical support, including 1T4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1T4G requirements.

6.How does Aetrix verify that 1T4G is sourced from the original manufacturer or authorized distributors?

All 1T4G 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 1T4G meets industry standards.

7.What is the process for return or replacement of 1T4G?

All 1T4G units undergo pre-shipment inspection (PSI). If there is an issue with 1T4G, 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 1T4G part is unused and in its original packaging.

Return procedure for 1T4G:

1.Submit a request within 90 days.

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

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