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

Taiwan Semiconductor Corporation RS1KFS

Name: RS1KFS
Brand: Taiwan Semiconductor Corporation
SKU: RS1KFS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RS1KFS

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-128

Datasheet:: RS1KFS.pdf

Description:: DIODE GEN PURP 800V 1A SOD128

Quantity:: RFQ Add To RFQ list

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Inventory:28,000

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Product details

Overview

RS1KFS from Taiwan Semiconductor is a 1 A, 800 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-used in switching-mode power supplies and DC-DC converters.

For engineers reviewing the RS1KFS datasheet, RS1KFS pinout, RS1KFS application, or RS1KFS equivalent, key selection criteria include rated repetitive peak reverse voltage (800 V), thermal resistance (R_θJL = 29 °C/W), surge capability (30 A I_FSM), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The RS1KFS is a single-die, glass-passivated fast recovery rectifier optimized for high-efficiency switching applications. Its 800 V V_RRM, 500 ns trr, and low-profile SOD-128 package support compact, thermally efficient layouts in high-frequency SMPS.

Thermal performance is characterized with R_θJL = 29 °C/W and R_θJA = 84 °C/W on a 5 mm × 5 mm Cu pad PCB. Reverse leakage remains ≤50 µA at 125°C, enabling stable operation in elevated ambient environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - supports input stages of 380 VAC-derived DC bus or 400 V nominal boost converters
I_F	1 A continuous - suitable for low-to-medium power output rectification (e.g., 12–24 V @ ~10–25 W)
t_rr	500 ns - enables operation up to ~200 kHz without excessive switching loss in hard-switched topologies
V_F (max)	1.30 V @ 1.0 A, 25°C - contributes <1.3 W conduction loss at full load, aiding thermal management
R_θJL	29 °C/W - allows direct heat transfer to PCB copper, reducing need for external heatsinking
I_FSM	30 A (8.3 ms half-sine) - withstands inrush and transient overloads common in AC-input front ends

Pinout & Package

Package: SOD-128 - low-profile, surface-mount plastic case (JEDEC DO-221AD variation), cathode indicated by band, matte tin-plated leads, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current entry point	Connected to unregulated or switched node (e.g., transformer secondary or MOSFET drain)
Cathode	Output current exit point	Feeds bulk capacitor or post-regulator stage; polarity marked by visible band on package

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability under humidity and thermal cycling vs. epoxy-passivated alternatives
Low profile SOD-128 package	Enables <1.2 mm board height clearance-critical for ultra-thin power adapters and LED drivers
RoHS and halogen-free compliance	Meets IPC-1752A material declaration requirements for export and eco-design certification
Junction temperature range: –55°C to +175°C	Supports operation in automotive under-hood or industrial motor drive environments without derating

Applications

AC-DC Adapter Output Rectification	DC-DC Converter Secondary Side
Use Scenario: 12 V/1 A output stage of universal-input wall adapter with active clamp flyback topology. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer reset phase; replaces slower 1N4007-type diodes. Use Value: 500 ns t_rr reduces switching loss and EMI vs. standard recovery diodes, improving efficiency by ~1.2% at 100 kHz.	Use Scenario: Isolated 5 V/1 A auxiliary rail in telecom power module using forward converter. IC Role / Device Role / Timing Role: Synchronous rectification alternative where gate drive complexity is avoided; handles 1 A average current with minimal conduction loss. Use Value: 1.30 V V_F max limits conduction loss to ≤1.3 W, easing thermal design on double-sided PCBs.
Industrial Motor Drive Snubber Network	LED Driver Bulk Rectification
Use Scenario: Clamping diode in IGBT snubber circuit for 24 V DC motor control with PWM switching at 15 kHz. IC Role / Device Role / Timing Role: Fast-recovery path for inductive kickback energy; operates with 800 V standoff and 30 A surge tolerance. Use Value: 30 A I_FSM and 175°C T_JMAX ensure robustness against repeated inductive transients without degradation.	Use Scenario: Input bridge rectifier in constant-current LED driver for street lighting (120 VAC input, 350 mA output). IC Role / Device Role / Timing Role: Primary AC line rectification before PFC stage; leverages 800 V V_RRM for margin over 170 V peak line. Use Value: Glass passivation and JESD201 Class 2 whisker resistance enable >10-year field life in outdoor thermal cycling environments.

AC-DC Adapter Output Rectification

DC-DC Converter Secondary Side

Use Scenario: 12 V/1 A output stage of universal-input wall adapter with active clamp flyback topology.

IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer reset phase; replaces slower 1N4007-type diodes.

Use Value: 500 ns t_rr reduces switching loss and EMI vs. standard recovery diodes, improving efficiency by ~1.2% at 100 kHz.

Use Scenario: Isolated 5 V/1 A auxiliary rail in telecom power module using forward converter.

IC Role / Device Role / Timing Role: Synchronous rectification alternative where gate drive complexity is avoided; handles 1 A average current with minimal conduction loss.

Use Value: 1.30 V V_F max limits conduction loss to ≤1.3 W, easing thermal design on double-sided PCBs.

Industrial Motor Drive Snubber Network

LED Driver Bulk Rectification

Use Scenario: Clamping diode in IGBT snubber circuit for 24 V DC motor control with PWM switching at 15 kHz.

IC Role / Device Role / Timing Role: Fast-recovery path for inductive kickback energy; operates with 800 V standoff and 30 A surge tolerance.

Use Value: 30 A I_FSM and 175°C T_JMAX ensure robustness against repeated inductive transients without degradation.

Use Scenario: Input bridge rectifier in constant-current LED driver for street lighting (120 VAC input, 350 mA output).

IC Role / Device Role / Timing Role: Primary AC line rectification before PFC stage; leverages 800 V V_RRM for margin over 170 V peak line.

Use Value: Glass passivation and JESD201 Class 2 whisker resistance enable >10-year field life in outdoor thermal cycling environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R08	Same 1 A / 800 V rating; trr = 450 ns (slightly faster); TO-277 package (larger footprint)	Requires PCB layout change due to TO-277 vs. SOD-128; higher R_θJA (100 °C/W)	Prefer when higher surge margin or legacy TO-277 footprint is required
ES1J	Same SOD-128 package; trr = 35 ns (much faster); V_RRM = 600 V (lower voltage rating)	Not suitable for 800 V designs; better for high-frequency <100 kHz, lower-voltage outputs	Choose only if system V_RRM requirement is ≤600 V and trr <100 ns is critical

Compared with STTH1R08 and ES1J, the RS1KFS offers optimal balance of 800 V rating, SOD-128 footprint, and 500 ns trr for cost-sensitive, space-constrained industrial and adapter designs-without compromising surge robustness or thermal performance.

Availability

RS1KFS is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converters, and industrial motor drives requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for RS1KFS 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 power and protection markets since 1979.

The RS1KFS belongs to TSC's RSxFS fast recovery rectifier family, designed specifically for high-efficiency, surface-mount power conversion in consumer, industrial, and lighting applications where thermal performance and reliability under cyclic stress are critical.

FAQ

What is the maximum junction temperature rating for RS1KFS?

The RS1KFS has a maximum junction temperature (T_JMAX) of +175°C, allowing operation in high-ambient environments such as enclosed power supplies or under-hood automotive modules. This rating is validated per JEDEC test conditions and supports full 1 A current derating up to 125°C ambient without exceeding thermal limits.

Does RS1KFS have a specified reverse recovery time, and how is it measured?

Yes, the RS1KFS has a reverse recovery time (t_rr) 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 and applies across the full operating temperature range, supporting reliable timing in 100–200 kHz switching applications.

Is RS1KFS compatible with lead-free reflow soldering processes?

Yes, RS1KFS is compatible with standard lead-free reflow profiles. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the SOD-128 package is rated for peak reflow temperatures up to 260°C per J-STD-020 (MSL Level 1). No pre-baking is required prior to assembly.

What does the "K" in RS1KFS indicate?

The "K" in RS1KFS denotes the 800 V repetitive peak reverse voltage (V_RRM) rating within the RSxFS family. Per the ordering code table, RS1DFS = 200 V, RS1GFS = 400 V, RS1JFS = 600 V, RS1KFS = 800 V, and RS1MFS = 1000 V-each sharing identical package, thermal, and electrical characteristics except V_RRM and associated trr.

How does RS1KFS compare to standard recovery rectifiers like 1N4007 in practical use?

Compared to 1N4007, the RS1KFS delivers significantly lower switching loss due to its 500 ns t_rr (vs. ~2–4 µs), reduced forward voltage (1.30 V max vs. ~1.7 V), and superior thermal resistance (R_θJL = 29 °C/W vs. ~60 °C/W). These advantages directly improve efficiency and thermal margin in modern switch-mode designs where 1N4007 is no longer suitable.

RS1KFS 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):: 800 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 @ 800 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

RS1KFS FAQ

1.How can I place an order for RS1KFS through Aetrix?

Please submit a Request for Quotation (RFQ) for RS1KFS 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 RS1KFS reliable?

The price and inventory of RS1KFS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1KFS is usually 5 days.

3.What payment methods are accepted for RS1KFS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1KFS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RS1KFS?

RS1KFS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RS1KFS 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 RS1KFS?

For technical support, including RS1KFS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1KFS requirements.

6.How does Aetrix verify that RS1KFS is sourced from the original manufacturer or authorized distributors?

All RS1KFS 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 RS1KFS meets industry standards.

7.What is the process for return or replacement of RS1KFS?

All RS1KFS units undergo pre-shipment inspection (PSI). If there is an issue with RS1KFS, 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 RS1KFS part is unused and in its original packaging.

Return procedure for RS1KFS:

1.Submit a request within 90 days.

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

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