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Taiwan Semiconductor Corporation RS1MFS
- Part No.:
- RS1MFS
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-128
- Datasheet:
-
RS1MFS.pdf
- Description:
- DIODE GEN PURP 1KV 1A SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:28,000
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Product details
Overview
RS1MFS from Taiwan Semiconductor is a 1 A, 1000 V fast recovery surface-mount rectifier in SOD-128 package, featuring 500 ns reverse recovery time, 1.30 V max forward voltage at 1.0 A/25°C, and 175°C maximum junction temperature. It serves as a primary-side output rectifier in high-voltage DC-DC converters and switching inverters.
For engineers reviewing the RS1MFS datasheet, RS1MFS pinout, RS1MFS application, or RS1MFS equivalent, key selection criteria include peak reverse voltage rating, thermal resistance (RθJL = 29°C/W), forward voltage consistency across temperature, and SOD-128 board-level mounting compatibility.
Technical Context
The RS1MFS employs a single-die, glass-passivated PN junction optimized for fast recovery (trr ≤ 500 ns) under 0.5 A forward / 1.0 A reverse switching conditions. Its 1000 V VRRM and 30 A IFSM surge rating support robust operation in high-voltage transient environments.
Thermal design is enabled by low RθJL (29°C/W) and RθJC (30°C/W), verified on 5 mm × 5 mm Cu pad PCBs. The device operates across –55°C to +175°C junction range with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - supports primary-side rectification in 800 V DC bus systems without derating |
| IF | 1 A continuous - rated for steady-state conduction in compact power supplies |
| trr | ≤500 ns - enables efficient high-frequency switching up to 100 kHz with low switching loss |
| VF max | 1.30 V @ 1.0 A, 25°C - limits conduction loss to ≤1.3 W at full load |
| RθJL | 29°C/W - allows direct thermal path to PCB copper, simplifying heatsinking |
| IFSM | 30 A - withstands inrush and fault currents in SMPS startup and overload scenarios |
| Junction temp | –55°C to +175°C - qualified for industrial and automotive under-hood ambient conditions |
Pinout & Package
Package: SOD-128 - low-profile, surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity indicator. Weight: 0.027 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node) |
| Cathode | Current exit point during forward conduction; reverse-blocking terminal | Marked by band; connects to output rail or filter capacitor positive terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable leakage current (<5 µA @ 1000 V, 25°C) and long-term reliability under humidity stress |
| Low profile SOD-128 | Height ≤ 1.2 mm - enables ultra-thin power supply designs and automated placement |
| J-STD-020 Level 1 MSL | Zero bake requirement before reflow - reduces manufacturing overhead and moisture-related defects |
| RoHS & halogen-free | Complies with IPC-1752A material declaration requirements for global electronics compliance |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability applications over 10+ year service life |
Applications
| High-Voltage DC-DC Converter | Switching Inverter Output Stage |
|---|---|
Use Scenario: Isolated 400–800 V input to 12–48 V output DC-DC converter in telecom power shelves. IC Role / Device Role / Timing Role: Primary-side fast recovery rectifier handling 100 kHz switching with minimal reverse recovery loss. Use Value: 500 ns trr and 1.30 V VF max reduce switching losses by ≥18% vs. standard recovery diodes at 100 kHz. | Use Scenario: Output rectification in 3-phase motor drive inverters with 650–1200 V DC link. IC Role / Device Role / Timing Role: Freewheeling diode clamping inverter leg voltage spikes during IGBT turn-off. Use Value: 1000 V VRRM and 30 A IFSM provide margin against DC link transients exceeding 900 V. |
| Solar Microinverter Input Stage | Industrial AC-DC Front-End |
Use Scenario: MPPT-stage rectification in string-connected solar microinverters operating up to 1000 V open-circuit. IC Role / Device Role / Timing Role: High-voltage input bridge rectifier sustaining repeated 1000 V reverse bias with low leakage. Use Value: <5 µA IR @ 1000 V/25°C ensures minimal no-load power loss and improved light-load efficiency. | Use Scenario: Input rectification in DIN-rail mounted PLC power supplies with universal AC input. IC Role / Device Role / Timing Role: General-purpose fast recovery diode in bridge configuration for 230 V AC to 325 V DC conversion. Use Value: 175°C TJMAX and RθJL = 29°C/W enable reliable operation without forced air cooling in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-1EWH10 | Same SOD-128 package, 1000 V VRRM, but trr = 750 ns (vs. 500 ns); VF max = 1.35 V @ 1 A | Higher switching loss in >80 kHz designs due to slower recovery | Acceptable where layout constraints prioritize footprint match over efficiency optimization |
| ON Semiconductor FFPF10U100ST | TO-220FP package, 1000 V, trr = 500 ns, but requires heatsink; VF max = 1.25 V @ 1 A | Not surface-mount; incompatible with automated SMT assembly | Preferred only when thermal budget exceeds SOD-128 capability and manual assembly is acceptable |
Compared with VS-1EWH10 and FFPF10U100ST, the RS1MFS uniquely combines 500 ns recovery, SOD-128 mountability, and 1000 V rating-enabling high-efficiency, space-constrained, fully automated power supply designs without thermal derating.
Availability
RS1MFS is available at Aetrix Electronics and suitable for high-voltage DC-DC converters, solar microinverter front-ends, and industrial AC-DC power supplies requiring stable component supply and long-lifecycle availability.
Supply support for RS1MFS 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 industrial, computing, and consumer markets since 1979.
The RS1MFS belongs to TSC's RS1xFS fast recovery rectifier family, designed specifically for high-efficiency, high-voltage switching power supplies where low trr, tight VF tolerance, and SMT manufacturability are critical.
FAQ
What is the maximum repetitive peak reverse voltage rating of the RS1MFS?
The RS1MFS has a maximum repetitive peak reverse voltage (VRRM) of 1000 V, verified per JEDEC test conditions. This rating allows the RS1MFS to operate reliably in 800 V DC bus applications with sufficient safety margin. The 1000 V value is specific to RS1MFS and differs from lower-voltage variants like RS1DFS (200 V) in the same family.
Does the RS1MFS have a defined reverse recovery time, and how is it measured?
Yes, the RS1MFS has a specified reverse recovery time (trr) of ≤500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the manufacturer's test condition. This value is confirmed in the Electrical Specifications table for RS1KFS and RS1MFS variants and reflects performance at 25°C ambient.
What package type does the RS1MFS use, and what are its key mechanical attributes?
The RS1MFS uses the SOD-128 surface-mount package per JEDEC DO-221AD. Key attributes include matte tin-plated leads compliant with J-STD-002, UL 94V-0 flammability rating, moisture sensitivity level 1, and a cathode band for polarity identification. Its dimensions are 4.40 × 2.30 × 1.20 mm (L × W × H).
Is the RS1MFS RoHS and halogen-free compliant?
Yes, the RS1MFS is RoHS compliant and halogen-free, as explicitly stated in the FEATURES section of the official datasheet. These compliance statements apply directly to the RS1MFS variant and are verified per IPC-1752A reporting standards for material content disclosure.
What is the thermal resistance from junction to lead (RθJL) for the RS1MFS, and how is it validated?
The RS1MFS has a typical junction-to-lead thermal resistance (RθJL) of 29°C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC JESD51-14. This value is published in the THERMAL PERFORMANCE section and applies to the SOD-128 package under defined board-level mounting conditions.
RS1MFS 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):
- 1000 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 500 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1000 V
- Capacitance @ Vr, F:
- 7pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-128
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1MFS FAQ
1.How can I place an order for RS1MFS through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1MFS 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 RS1MFS reliable?
The price and inventory of RS1MFS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1MFS is usually 5 days.
3.What payment methods are accepted for RS1MFS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1MFS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1MFS?
RS1MFS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1MFS 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 RS1MFS?
For technical support, including RS1MFS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1MFS requirements.
6.How does Aetrix verify that RS1MFS is sourced from the original manufacturer or authorized distributors?
All RS1MFS 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 RS1MFS meets industry standards.
7.What is the process for return or replacement of RS1MFS?
All RS1MFS units undergo pre-shipment inspection (PSI). If there is an issue with RS1MFS, 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 RS1MFS part is unused and in its original packaging.
Return procedure for RS1MFS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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