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

Taiwan Semiconductor Corporation RS1MLS

Name: RS1MLS
Brand: Taiwan Semiconductor Corporation
SKU: RS1MLS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RS1MLS

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-123H

Datasheet:: RS1MLS.pdf

Description:: 300NS, 1.2A, 1000V, FAST RECOVER

Quantity:: RFQ Add To RFQ list

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Inventory:18,900

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Product details

Overview

RS1MLS from Taiwan Semiconductor is a 1000V, 1.2A fast recovery surface-mount rectifier in SOD-123HE package, featuring 300 ns reverse recovery time, 50 A surge capability, and 175°C maximum junction temperature. It serves as a primary output rectifier in high-voltage DC-DC converters for industrial power supplies.

For engineers reviewing the RS1MLS datasheet, RS1MLS pinout, RS1MLS application, or RS1MLS equivalent, key selection criteria include V_RRM = 1000 V, I_F = 1.2 A, t_rr = 300 ns, R_θJA = 80 °C/W, and SOD-123HE mechanical compatibility with automated placement.

Technical Context

The RS1MLS operates as a single-die, unidirectional silicon rectifier optimized for switching-mode power conversion where high peak reverse voltage and fast recovery are required to minimize switching losses. Its 1000 V V_RRM rating enables use in 800 V DC bus systems, while the 300 ns t_rr supports operation up to ~500 kHz in hard-switched topologies.

Thermally, the device uses a matte tin-plated SOD-123HE leadframe with R_θJL = 20 °C/W, enabling efficient heat transfer to PCB copper. The 175°C T_JMAX and J-STD-020 Level 1 moisture sensitivity support reflow-compatible manufacturing without baking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - Withstands 1000 V repetitive reverse voltage, suitable for 800 V DC-link applications with safety margin.
I_F	1.2 A continuous - Rated average forward current at T_A = 75°C on FR-4 PCB with 10 mm² copper pad.
t_rr	300 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables reduced switching loss in SMPS.
V_F	≤1.3 V @ 1.2 A - Forward voltage drop directly impacts conduction loss and thermal design in high-current paths.
R_θJA	80 °C/W - Junction-to-ambient thermal resistance defines maximum power dissipation (P_D ≈ 1.25 W at T_A = 75°C).
I_FSM	50 A - Non-repetitive surge rating allows handling of inrush or fault currents without failure.
T_JMAX	175 °C - Maximum junction temperature permits operation in high-ambient industrial environments.

Pinout & Package

Package: SOD-123HE - Surface-mount plastic package with cathode band marking, 0.022 g weight, UL 94V-0 molding compound, and 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 (e.g., transformer secondary center-tap or switch node return) in rectification path.
Cathode	Forward current exit point	Marked by band; connects to output capacitor positive rail; carries full load current and must be routed with low-inductance layout.

Key Features

Feature	Design Value
Fast recovery (t_rr ≤ 300 ns)	Reduces reverse recovery charge (Q_rr) and associated switching loss in high-frequency converters.
1000 V V_RRM rating	Supports designs with 800 V DC input or high-voltage flyback/forward topologies requiring robust voltage margin.
SOD-123HE compact footprint	Enables high-density PCB layouts; compatible with standard 0805–1206 pick-and-place equipment.
J-STD-020 Level 1 moisture sensitivity	Eliminates pre-bake requirement before reflow, reducing manufacturing cost and cycle time.
RoHS-compliant & halogen-free	Meets environmental compliance requirements for industrial and export-oriented power supply designs.

Applications

Industrial DC-DC Converters	High-Voltage Flyback Supplies
Use Scenario: Isolated 24 V/5 A output from 800 V DC bus in factory automation power modules. IC Role / Device Role / Timing Role: Primary-side output rectifier converting high-frequency AC from transformer secondary into regulated DC. Use Value: 1000 V V_RRM ensures safe operation under transient overvoltage; 300 ns t_rr minimizes switching loss at 250 kHz.	Use Scenario: 12 V/2 A auxiliary supply in EV battery management system using 600–1000 V battery stack as input. IC Role / Device Role / Timing Role: Secondary-side rectifier in discontinuous conduction mode (DCM) flyback converter. Use Value: Low V_F (≤1.3 V) reduces conduction loss at light loads; SOD-123HE size fits constrained board space.
Switching Inverters	General-Purpose HV Rectification
Use Scenario: DC link rectification in 3-phase solar micro-inverter front-end with 1000 V PV string input. IC Role / Device Role / Timing Role: Freewheeling diode in active clamp or synchronous rectification auxiliary path. Use Value: 50 A I_FSM withstands inverter startup surges; 175°C T_JMAX supports operation near heatsinks.	Use Scenario: Input bridge rectifier replacement in legacy 1000 V-rated industrial control power supplies. IC Role / Device Role / Timing Role: Discrete high-voltage rectifying element replacing axial-leaded or TO-220 devices. Use Value: SOD-123HE surface-mount form factor eliminates through-hole assembly; RoHS/halogen-free meets modern compliance mandates.

Industrial DC-DC Converters

High-Voltage Flyback Supplies

Use Scenario: Isolated 24 V/5 A output from 800 V DC bus in factory automation power modules.

IC Role / Device Role / Timing Role: Primary-side output rectifier converting high-frequency AC from transformer secondary into regulated DC.

Use Value: 1000 V V_RRM ensures safe operation under transient overvoltage; 300 ns t_rr minimizes switching loss at 250 kHz.

Use Scenario: 12 V/2 A auxiliary supply in EV battery management system using 600–1000 V battery stack as input.

IC Role / Device Role / Timing Role: Secondary-side rectifier in discontinuous conduction mode (DCM) flyback converter.

Use Value: Low V_F (≤1.3 V) reduces conduction loss at light loads; SOD-123HE size fits constrained board space.

Switching Inverters

General-Purpose HV Rectification

Use Scenario: DC link rectification in 3-phase solar micro-inverter front-end with 1000 V PV string input.

IC Role / Device Role / Timing Role: Freewheeling diode in active clamp or synchronous rectification auxiliary path.

Use Value: 50 A I_FSM withstands inverter startup surges; 175°C T_JMAX supports operation near heatsinks.

Use Scenario: Input bridge rectifier replacement in legacy 1000 V-rated industrial control power supplies.

IC Role / Device Role / Timing Role: Discrete high-voltage rectifying element replacing axial-leaded or TO-220 devices.

Use Value: SOD-123HE surface-mount form factor eliminates through-hole assembly; RoHS/halogen-free meets modern compliance mandates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage fast recovery rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-1N5819HM3/85A	V_RRM = 40 V, I_F = 1 A, t_rr = 40 ns - Lower voltage, faster but not rated for >100 V.	Not suitable for 1000 V systems; limited to low-voltage DC-DC or signal clamping.	Select only if V_RRM < 60 V is sufficient and ultra-fast recovery is prioritized over voltage rating.
ON Semiconductor MUR120RLG	V_RRM = 200 V, I_F = 1 A, t_rr = 75 ns - Higher speed but insufficient voltage margin for 800+ V buses.	Applicable in 100–200 V SMPS; cannot replace RS1MLS in high-voltage industrial converters.	Use where 200 V rating suffices and faster t_rr improves efficiency; not a drop-in substitute for RS1MLS.

Compared with VS-1N5819HM3/85A and MUR120RLG, RS1MLS uniquely delivers 1000 V blocking capability with 1.2 A current and 300 ns recovery-enabling direct use in 800 V DC-link rectification where alternatives fail on voltage rating.

Availability

RS1MLS is available at Aetrix Electronics and suitable for industrial DC-DC converters, high-voltage flyback supplies, and switching inverters requiring stable component supply with guaranteed long-term sourcing.

Supply support for RS1MLS 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, specializing in power rectifiers, TVS diodes, and MOSFETs.

The RS1MLS belongs to TSC's RS1xLS fast recovery rectifier product line, designed specifically for high-efficiency, high-voltage switching power supplies where compact size, reliability, and JEDEC-compliant packaging are critical.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for RS1MLS?

The RS1MLS has a maximum repetitive peak reverse voltage of 1000 V, as confirmed in the Absolute Maximum Ratings table of the E2304 datasheet. This rating applies under standard test conditions (T_A = 25°C) and defines the highest reverse voltage the device can block repeatedly without breakdown. Engineers must ensure system transients remain within this limit plus appropriate derating margin when using RS1MLS in actual designs.

Does RS1MLS have a specified reverse recovery time (t_rr)?

Yes, RS1MLS has a specified reverse recovery time of 300 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value is published in the Electrical Specifications section of the E2304 datasheet and reflects the device's performance in high-frequency switching applications. The t_rr directly influences switching loss and EMI behavior in SMPS circuits using RS1MLS.

What package type does RS1MLS use, and is it compatible with automated assembly?

RS1MLS uses the SOD-123HE surface-mount package, which features matte tin-plated leads and complies with J-STD-002 solderability standards. The package is explicitly noted as "ideal for automated placement" in the datasheet features list. Its dimensions, polarity marking (cathode band), and moisture sensitivity level (J-STD-020 Level 1) confirm full compatibility with standard SMT reflow processes without pre-baking.

What is the forward voltage (V_F) of RS1MLS at rated current?

The forward voltage of RS1MLS is ≤1.3 V at I_F = 1.2 A and T_J = 25°C, per the Electrical Specifications table in the E2304 datasheet. This maximum value represents worst-case conduction loss under nominal operating conditions. Actual V_F will decrease at lower temperatures and increase slightly at higher junction temperatures, impacting thermal design and efficiency calculations for RS1MLS in power supply applications.

Is RS1MLS RoHS-compliant and halogen-free?

Yes, RS1MLS is both RoHS-compliant and halogen-free, as stated in the FEATURES section of the E2304 datasheet. These attributes meet global environmental regulations including EU RoHS Directive 2011/65/EU and IEC 61249-2-21 for halogen content. This makes RS1MLS suitable for export-oriented industrial and consumer electronics where material compliance is mandatory for market access.

RS1MLS Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-123H

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 V

Current - Average Rectified (Io):: 1.2A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1.2 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 300 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 1000 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123HE

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

RS1MLS FAQ

1.How can I place an order for RS1MLS through Aetrix?

Please submit a Request for Quotation (RFQ) for RS1MLS 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 RS1MLS reliable?

The price and inventory of RS1MLS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1MLS is usually 5 days.

3.What payment methods are accepted for RS1MLS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1MLS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RS1MLS?

RS1MLS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RS1MLS 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 RS1MLS?

For technical support, including RS1MLS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1MLS requirements.

6.How does Aetrix verify that RS1MLS is sourced from the original manufacturer or authorized distributors?

All RS1MLS 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 RS1MLS meets industry standards.

7.What is the process for return or replacement of RS1MLS?

All RS1MLS units undergo pre-shipment inspection (PSI). If there is an issue with RS1MLS, 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 RS1MLS part is unused and in its original packaging.

Return procedure for RS1MLS:

1.Submit a request within 90 days.

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

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