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

Taiwan Semiconductor Corporation S3AHR7G

Name: S3AHR7G
Brand: Taiwan Semiconductor Corporation
SKU: S3AHR7G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S3AHR7G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: S3AHR7G.pdf

Description:: DIODE GEN PURP 50V 3A DO214AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

S3AHR7G from Taiwan Semiconductor is a 3 A, 400 V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (max 1.15 V at 3 A), high surge capability (100 A @ 8.3 ms), and RoHS/halogen-free compliance - used in AC/DC front-end stages of switching power supplies and LED drivers.

For engineers reviewing the S3AHR7G datasheet, S3AHR7G pinout, S3AHR7G application, or S3AHR7G equivalent, key selection criteria include repetitive peak reverse voltage (V_RRM = 400 V), thermal resistance (R_θJL = 13 °C/W), reverse recovery time (t_rr = 1500 ns), moisture sensitivity level (MSL 1), and cathode-band polarity marking for PCB layout verification.

Technical Context

The S3AHR7G is a single-die, standard recovery silicon rectifier optimized for cost-sensitive, medium-voltage SMPS input rectification where fast recovery is not required. Its 1500 ns reverse recovery time and 60 pF junction capacitance reflect trade-offs favoring low conduction loss over switching speed.

Designed for surface-mount assembly on FR-4 PCBs, it supports automated placement and reflow soldering per J-STD-002, with matte tin-plated leads, UL 94V-0 molding compound, and JESD 201 Class 2 whisker resistance - enabling reliable operation up to 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse voltage the device blocks without breakdown; defines usable input voltage range in bridge or single-diode rectifier configurations
I_F	3 A continuous - average forward current rating at case temperature ≤ 75 °C; determines heatsinking requirements in sustained-load applications
I_FSM	100 A @ 8.3 ms - peak surge current handling; enables robustness against line transients and inrush in offline converters
V_F	≤1.15 V @ 3 A, 25 °C - forward voltage drop directly impacts conduction loss and thermal design; lower V_F reduces I²R heating in high-duty-cycle operation
t_rr	1500 ns - reverse recovery time under specified test conditions; influences switching losses and EMI in higher-frequency topologies
R_θJL	13 °C/W - junction-to-lead thermal resistance; critical for estimating die temperature rise when lead acts as primary heat path to PCB copper
MSL	Level 1 - no floor-life limitation or bake requirement before reflow; simplifies manufacturing logistics and inventory management

Pinout & Package

Package: DO-214AB (SMC), molded plastic case with cathode band marking; dimensions per JEDEC DO-214AB Issue D; weight ≈ 0.210 g; UL 94V-0 rated compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry terminal	Connected to AC input or transformer secondary; must withstand full surge current and reverse voltage stress during off-state
Cathode	Forward current exit terminal	Marked by visible band; ties to DC bus or filter capacitor; carries full load current and defines output polarity in uncontrolled rectifiers

Key Features

Feature	Design Value
Glass-passivated junction	Enhances long-term reliability and humidity resistance vs. epoxy-passivated alternatives; eliminates need for conformal coating in humid environments
Low V_F (≤1.15 V)	Reduces conduction loss by ~15–20% versus legacy 1N54xx series at 3 A, lowering thermal stress on PCB copper and adjacent components
High I_FSM (100 A)	Withstands 10× rated current for 8.3 ms - sufficient for most 120/230 VAC line surges without derating or parallel devices
MSL Level 1	Eliminates pre-bake step and floor-life tracking; compatible with standard SMT lines without process modification
Halogen-free & RoHS	Meets global environmental compliance mandates (EU RoHS, JEITA EG-1001); avoids brominated flame retardants in PCB assembly

Applications

AC/DC Adapter Input Rectification	LED Driver Bulk Rectification
Use Scenario: Converts 90–264 VAC mains to pulsating DC prior to PFC or buck converter stage in compact wall adapters. IC Role / Device Role / Timing Role: Uncontrolled rectifier in single-phase full-wave bridge configuration; conducts only during positive half-cycles of AC input. Use Value: 400 V V_RRM provides 2× safety margin over 264 VAC peak (373 V); 100 A I_FSM absorbs cold-start inrush without failure.	Use Scenario: Rectifies transformer output in isolated constant-current LED drivers for street lighting and commercial fixtures. IC Role / Device Role / Timing Role: Secondary-side rectifier delivering DC to LED string; operates at line frequency with minimal switching loss. Use Value: Low 1.15 V V_F minimizes power loss in high-current (≥2 A) LED loads; DO-214AB footprint allows dense thermal pad layout on metal-core PCBs.
Industrial SMPS Input Stage	DC-DC Converter Front-End
Use Scenario: Input rectification in 20–100 W industrial power modules requiring wide ambient temperature range (-40 to +85 °C). IC Role / Device Role / Timing Role: Primary rectifier in voltage-doubler or bridge configuration; handles continuous 3 A load with 150 °C max junction rating. Use Value: R_θJL = 13 °C/W enables direct thermal coupling to copper pour; MSL Level 1 ensures compatibility with high-volume automated assembly.	Use Scenario: Off-line rectification feeding isolated flyback or forward converter in telecom or networking equipment. IC Role / Device Role / Timing Role: High-voltage rectifier converting AC line to intermediate DC bus; operates at 50/60 Hz with negligible switching loss. Use Value: 60 pF junction capacitance limits displacement current during voltage transitions; stable IR < 10 µA at 25 °C ensures low leakage in standby mode.

AC/DC Adapter Input Rectification

LED Driver Bulk Rectification

Use Scenario: Converts 90–264 VAC mains to pulsating DC prior to PFC or buck converter stage in compact wall adapters.

IC Role / Device Role / Timing Role: Uncontrolled rectifier in single-phase full-wave bridge configuration; conducts only during positive half-cycles of AC input.

Use Value: 400 V V_RRM provides 2× safety margin over 264 VAC peak (373 V); 100 A I_FSM absorbs cold-start inrush without failure.

Use Scenario: Rectifies transformer output in isolated constant-current LED drivers for street lighting and commercial fixtures.

IC Role / Device Role / Timing Role: Secondary-side rectifier delivering DC to LED string; operates at line frequency with minimal switching loss.

Use Value: Low 1.15 V V_F minimizes power loss in high-current (≥2 A) LED loads; DO-214AB footprint allows dense thermal pad layout on metal-core PCBs.

Industrial SMPS Input Stage

DC-DC Converter Front-End

Use Scenario: Input rectification in 20–100 W industrial power modules requiring wide ambient temperature range (-40 to +85 °C).

IC Role / Device Role / Timing Role: Primary rectifier in voltage-doubler or bridge configuration; handles continuous 3 A load with 150 °C max junction rating.

Use Value: R_θJL = 13 °C/W enables direct thermal coupling to copper pour; MSL Level 1 ensures compatibility with high-volume automated assembly.

Use Scenario: Off-line rectification feeding isolated flyback or forward converter in telecom or networking equipment.

IC Role / Device Role / Timing Role: High-voltage rectifier converting AC line to intermediate DC bus; operates at 50/60 Hz with negligible switching loss.

Use Value: 60 pF junction capacitance limits displacement current during voltage transitions; stable IR < 10 µA at 25 °C ensures low leakage in standby mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-3EJH04-M3/45	V_RRM = 400 V, I_F = 3 A, t_rr = 2000 ns, R_θJA = 50 °C/W, DO-214AB	Slower recovery (2000 ns) and higher thermal resistance; suitable where EMI is less constrained	Select if prioritizing supply chain diversity over minimal V_F or thermal performance
ON Semiconductor MUR340RLG	V_RRM = 400 V, I_F = 3 A, t_rr = 75 ns (ultrafast), V_F = 1.3 V, DO-214AB	Ultrafast recovery reduces switching loss but increases V_F and cost; requires EMI filtering	Choose only when operating >100 kHz or needing reduced di/dt-induced noise

Compared with VS-3EJH04-M3/45 and MUR340RLG, the S3AHR7G delivers the lowest forward voltage (≤1.15 V) and best thermal resistance (R_θJL = 13 °C/W) among 400 V, 3 A DO-214AB rectifiers - making it optimal for thermally constrained, line-frequency rectification where efficiency and reliability outweigh ultrafast switching needs.

Availability

S3AHR7G is available at Aetrix Electronics and suitable for switching mode power supplies, LED drivers, and industrial AC/DC adapters requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for S3AHR7G 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, MOSFETs, and IGBTs.

The S3AHR7G belongs to TSC's S3x standard recovery rectifier family, designed for cost-effective, high-reliability AC/DC front-end rectification in consumer, industrial, and lighting power supplies.

FAQ

What is the maximum junction temperature rating for the S3AHR7G?

The S3AHR7G has a maximum junction temperature (T_J) of +150 °C, allowing operation in high-ambient environments such as enclosed LED drivers or industrial power supplies. This rating is validated across its full current and voltage operating range and supports derating curves published in the official TSC datasheet. Thermal design must ensure the die temperature stays below this limit under worst-case load and ambient conditions.

Does the S3AHR7G have a halogen-free and RoHS-compliant construction?

Yes, the S3AHR7G is explicitly certified halogen-free and RoHS compliant per TSC documentation. The molding compound contains no brominated or chlorinated flame retardants, and all plating and materials meet EU Directive 2011/65/EU requirements. This makes the S3AHR7G suitable for export to regulated markets and compatible with lead-free reflow processes.

What does the "HR7G" suffix in S3AHR7G indicate?

The "HR7G" suffix in S3AHR7G is Taiwan Semiconductor's internal date/batch code format - "HR" denotes manufacturing week/year, "7" is factory location, and "G" indicates green compound (halogen-free). It does not alter electrical specifications; the core device remains the S3A (400 V V_RRM) in DO-214AB package. Full parametric data applies regardless of suffix variation.

Can the S3AHR7G replace a 1N5408 in a new design?

Yes, the S3AHR7G can replace the 1N5408 in most applications: both are 3 A, 1000 V-rated through-hole rectifiers, but the S3AHR7G is DO-214AB surface-mount with 400 V V_RRM, lower V_F (1.15 V vs. ~1.2 V), and superior thermal resistance. Verify board layout, surge requirements, and voltage margin - the S3AHR7G is not a 1000 V part, so use only where 400 V rating suffices.

Is the S3AHR7G suitable for use in a full-wave bridge configuration?

Yes, the S3AHR7G is commonly used in full-wave bridge rectifiers, either as one quadrant or paired with identical units. Its DO-214AB package supports high-density layouts, and its 100 A I_FSM rating ensures robustness during AC line surges. Ensure proper cathode/anode orientation per bridge schematic and provide adequate PCB copper area for thermal dissipation, especially at full 3 A load.

S3AHR7G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.15 V @ 3 A

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

Reverse Recovery Time (trr):: 1.5 µs

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 30pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

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

S3AHR7G FAQ

1.How can I place an order for S3AHR7G through Aetrix?

Please submit a Request for Quotation (RFQ) for S3AHR7G 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 S3AHR7G reliable?

The price and inventory of S3AHR7G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3AHR7G is usually 5 days.

3.What payment methods are accepted for S3AHR7G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3AHR7G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S3AHR7G?

S3AHR7G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S3AHR7G 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 S3AHR7G?

For technical support, including S3AHR7G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3AHR7G requirements.

6.How does Aetrix verify that S3AHR7G is sourced from the original manufacturer or authorized distributors?

All S3AHR7G 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 S3AHR7G meets industry standards.

7.What is the process for return or replacement of S3AHR7G?

All S3AHR7G units undergo pre-shipment inspection (PSI). If there is an issue with S3AHR7G, 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 S3AHR7G part is unused and in its original packaging.

Return procedure for S3AHR7G:

1.Submit a request within 90 days.

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

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