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

Taiwan Semiconductor Corporation S1JFS MWG

Name: S1JFS MWG
Brand: Taiwan Semiconductor Corporation
SKU: S1JFS MWG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1JFS MWG

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-128

Datasheet:: S1JFS MWG.pdf

Description:: DIODE GEN PURP 600V 1A SOD128

Quantity:: RFQ Add To RFQ list

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Inventory:3,490

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Product details

Overview

S1JFS MWG from Taiwan Semiconductor is a 1A, 600V glass-passivated standard surface-mount rectifier diode in SOD-128 package, featuring 30A surge rating, 150°C max junction temperature, and 0.99V typical forward voltage at 1A/25°C - used in DC-DC converters and switching-mode power supplies.

For engineers reviewing the S1JFS MWG datasheet, S1JFS MWG pinout, S1JFS MWG application, or S1JFS MWG equivalent, key selection criteria include repetitive peak reverse voltage (600V), forward current rating (1A), thermal resistance (R_θJL = 29°C/W), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.

Technical Context

The S1JFS MWG is a single-die, unidirectional silicon rectifier optimized for high-efficiency AC-to-DC conversion in compact power stages. Its glass-passivated junction ensures stable reverse leakage (<1µA at 25°C, <50µA at 125°C) and robust surge handling (30A I_FSM, 8.3ms half-sine).

Thermally, it delivers R_θJL = 29°C/W and R_θJA = 82°C/W when mounted on a 5mm × 5mm Cu pad PCB - enabling reliable operation up to 150°C junction temperature under continuous 1A conduction with appropriate board layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - maximum repetitive reverse voltage the device blocks without breakdown; defines usable input voltage range in bridge or flyback designs
I_F	1 A - continuous average forward current rating; determines minimum heatsinking and trace width requirements
I_FSM	30 A - non-repetitive surge current capability; supports inrush and transient overload tolerance in SMPS startup
V_F @ 1A, 25°C	0.99 V (typ), 1.1 V (max) - forward drop directly impacts conduction loss and thermal design in high-duty-cycle applications
R_θJL	29 °C/W - junction-to-lead thermal resistance; enables direct solder-pad thermal path estimation for PCB-level thermal management
Junction Temp Range	–55°C to +150°C - operational temperature envelope supporting industrial and automotive ambient conditions
MSL Level	Level 1 (per J-STD-020) - no floor life limitation or bake requirement prior to reflow assembly

Pinout & Package

Package: SOD-128 - surface-mount, flat lead, single-diode outline with cathode band marking; 5mm × 4mm footprint, 1.1mm height; UL 94V-0 molding compound; matte tin-plated leads compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of AC source or transformer secondary; requires adequate copper area for thermal dissipation
Cathode	Forward current exit / reverse-blocking terminal	Marked by visible band; ties to output rail or switching node; polarity must be verified before PCB layout

Key Features

Feature	Design Value
Glass-passivated junction	Enhances long-term reliability and stability of reverse leakage under thermal cycling and humidity stress
J-STD-020 Level 1 MSL	Eliminates pre-reflow baking and floor-life tracking, reducing manufacturing overhead in high-volume SMT lines
RoHS & halogen-free	Complies with IEC 61249-2-21 and EU RoHS directives - required for export to EU, Japan, and China markets
Low R_θJL (29°C/W)	Enables efficient heat transfer from die to PCB pad, supporting higher power density without external heatsinks
1.1V max V_F @ 1A	Reduces conduction losses vs. legacy 1N400x series, improving efficiency in 5–24V output SMPS designs

Applications

DC-DC Converters	Switching Mode Inverters
Use Scenario: Secondary-side rectification in isolated buck-boost or forward converters delivering 3.3–12V outputs. IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates in continuous conduction mode (CCM). Use Value: 0.99V typical V_F minimizes conduction loss at 1A load, improving overall converter efficiency by ~0.8% over comparable 1N5819 devices.	Use Scenario: Freewheeling and clamp diode function in H-bridge motor inverters driving 24–48V BLDC systems. IC Role / Device Role / Timing Role: Reverse-biased blocking during active switching; conducts flyback energy during dead-time intervals. Use Value: 600V V_RRM provides 2× safety margin against 300V DC bus transients, preventing catastrophic failure during regenerative braking.
Industrial Power Supplies	LED Driver Circuits
Use Scenario: Input rectification stage in 10–30W open-frame AC-DC adapters for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Full-wave or half-wave rectifier in bridge configuration; handles 50/60Hz line frequency with low thermal drift. Use Value: 150°C T_JMAX and –55°C to +150°C operating range ensure stable performance across extended industrial temperature profiles.	Use Scenario: Constant-current regulation loop feedback path in isolated LED drivers using secondary-side sensing. IC Role / Device Role / Timing Role: Precision rectifier in signal conditioning circuitry; converts AC sense voltage to DC for error amplifier input. Use Value: Low 9pF junction capacitance (at 4V, 1MHz) preserves high-frequency response and avoids phase shift in feedback loops up to 100kHz.

DC-DC Converters

Switching Mode Inverters

Use Scenario: Secondary-side rectification in isolated buck-boost or forward converters delivering 3.3–12V outputs.

IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates in continuous conduction mode (CCM).

Use Value: 0.99V typical V_F minimizes conduction loss at 1A load, improving overall converter efficiency by ~0.8% over comparable 1N5819 devices.

Use Scenario: Freewheeling and clamp diode function in H-bridge motor inverters driving 24–48V BLDC systems.

IC Role / Device Role / Timing Role: Reverse-biased blocking during active switching; conducts flyback energy during dead-time intervals.

Use Value: 600V V_RRM provides 2× safety margin against 300V DC bus transients, preventing catastrophic failure during regenerative braking.

Industrial Power Supplies

LED Driver Circuits

Use Scenario: Input rectification stage in 10–30W open-frame AC-DC adapters for PLC I/O modules and sensors.

IC Role / Device Role / Timing Role: Full-wave or half-wave rectifier in bridge configuration; handles 50/60Hz line frequency with low thermal drift.

Use Value: 150°C T_JMAX and –55°C to +150°C operating range ensure stable performance across extended industrial temperature profiles.

Use Scenario: Constant-current regulation loop feedback path in isolated LED drivers using secondary-side sensing.

IC Role / Device Role / Timing Role: Precision rectifier in signal conditioning circuitry; converts AC sense voltage to DC for error amplifier input.

Use Value: Low 9pF junction capacitance (at 4V, 1MHz) preserves high-frequency response and avoids phase shift in feedback loops up to 100kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR160	600V V_RRM, 1A I_F, but faster recovery (75ns vs. ~500ns for S1JFS MWG); higher V_F (1.25V typ @ 1A)	Better suited for high-frequency (>100kHz) flyback or PFC stages where reverse recovery loss dominates	Select MUR160 only if switching frequency exceeds 50kHz and recovery loss outweighs conduction loss trade-off
Vishay VS-1N4937-M3/54	600V V_RRM, 1A I_F, same SOD-128 package; slightly higher V_F (1.05V max @ 1A) and lower I_FSM (25A)	Compatible in space-constrained industrial adapters where surge margin is less critical than footprint compatibility	Choose VS-1N4937-M3/54 when exact SOD-128 mechanical fit is mandatory and 30A surge headroom is not required

Compared with MUR160 and VS-1N4937-M3/54, the S1JFS MWG offers superior surge robustness (30A vs. 25–27A) and lowest forward voltage in its class - making it optimal for cost-sensitive, thermally constrained 50–100kHz SMPS where conduction loss drives thermal design.

Availability

S1JFS MWG is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and industrial power supplies requiring stable component supply, full RoHS/halogen-free compliance, and J-STD-020 Level 1 assembly readiness.

Supply support for S1JFS MWG 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, computing, and consumer markets since 1979.

The S1JFS MWG belongs to TSC's S1DFS–S1MFS standard rectifier family - designed specifically for high-reliability, cost-optimized AC/DC front-end and secondary-side rectification in space-constrained surface-mount power supplies.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1JFS MWG?

The S1JFS MWG has a maximum repetitive peak reverse voltage (V_RRM) of 600 V, as confirmed in the Absolute Maximum Ratings table of Taiwan Semiconductor's official datasheet (Version C2103). This rating defines the highest reverse voltage the diode can block continuously without breakdown and is validated across the full operating temperature range (–55°C to +150°C). The S1JFS MWG is part of the S1DFS–S1MFS family where 'J' explicitly denotes the 600V grade.

Does the S1JFS MWG have a defined moisture sensitivity level (MSL) for reflow assembly?

Yes, the S1JFS MWG is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and does not require dry-packaging or pre-reflow baking. This is explicitly stated in the FEATURES section of the official datasheet and verified by Taiwan Semiconductor's packaging qualification. The S1JFS MWG's SOD-128 molding compound and lead finish meet all Level 1 requirements for humidity exposure and solderability.

What is the typical forward voltage (V_F) of the S1JFS MWG at 1A and 25°C?

The typical forward voltage (V_F) of the S1JFS MWG is 0.99 V at 1A forward current and 25°C junction temperature, with a maximum of 1.1 V under the same conditions. This value is specified in the Electrical Specifications table of the official datasheet and measured using a 0.3ms pulse test. The S1JFS MWG's V_F remains stable at 0.85 V (typ) even at 125°C, supporting thermal resilience in high-ambient environments.

Is the S1JFS MWG RoHS and halogen-free compliant?

Yes, the S1JFS MWG is fully RoHS compliant and halogen-free per IEC 61249-2-21. This compliance is explicitly declared in the FEATURES section of the official datasheet and applies to all materials including molding compound, lead frame, and plating. Taiwan Semiconductor certifies that the S1JFS MWG contains no brominated flame retardants (BFRs), antimony trioxide, or other restricted halogen compounds above threshold limits.

What is the junction-to-lead thermal resistance (R_θJL) of the S1JFS MWG?

The junction-to-lead thermal resistance (R_θJL) of the S1JFS MWG is 29°C/W, measured under standardized conditions using a 5mm × 5mm copper pad PCB per JEDEC JESD51-2. This value is published in the Thermal Performance section of the official datasheet and reflects the dominant thermal path from die to solder joint. It enables accurate PCB thermal design without requiring external heatsinks for 1A continuous operation in well-laid-out layouts.

S1JFS MWG Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-128

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:: 1.1 V @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 µA @ 600 V

Capacitance @ Vr, F:: 9pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-128

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

S1JFS MWG FAQ

1.How can I place an order for S1JFS MWG through Aetrix?

Please submit a Request for Quotation (RFQ) for S1JFS MWG 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 S1JFS MWG reliable?

The price and inventory of S1JFS MWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1JFS MWG is usually 5 days.

3.What payment methods are accepted for S1JFS MWG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1JFS MWG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1JFS MWG?

S1JFS MWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1JFS MWG 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 S1JFS MWG?

For technical support, including S1JFS MWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1JFS MWG requirements.

6.How does Aetrix verify that S1JFS MWG is sourced from the original manufacturer or authorized distributors?

All S1JFS MWG 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 S1JFS MWG meets industry standards.

7.What is the process for return or replacement of S1JFS MWG?

All S1JFS MWG units undergo pre-shipment inspection (PSI). If there is an issue with S1JFS MWG, 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 S1JFS MWG part is unused and in its original packaging.

Return procedure for S1JFS MWG:

1.Submit a request within 90 days.

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

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