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

Taiwan Semiconductor Corporation RS1KF-T

Name: RS1KF-T
Brand: Taiwan Semiconductor Corporation
SKU: RS1KF-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RS1KF-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: RS1KF-T.pdf

Description:: 500NS, 1A, 800V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

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Inventory:7,500

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Product details

Overview

RS1KF-T from Taiwan Semiconductor is a fast recovery surface-mount rectifier diode rated for 800 V repetitive peak reverse voltage, 1 A average forward current, and 500 ns reverse recovery time, with 1.06 V typical forward voltage at 1.0 A and 25°C. It features glass-passivated junction, SMAF package, and is used in switching-mode power supplies and DC-DC converters.

For engineers reviewing the RS1KF-T datasheet, RS1KF-T pinout, RS1KF-T application, or RS1KF-T equivalent, key selection criteria include its 800 V V_RRM, 500 ns trr, 1.06 V VF at 1 A/25°C, thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The RS1KF-T is a single-die, unidirectional fast recovery rectifier optimized for high-frequency switching applications. Its 500 ns reverse recovery time and low junction capacitance (8 pF at 1 MHz, 4 V) reduce switching losses and EMI generation in SMPS topologies.

Designed for surface-mount assembly on PCBs with 5 mm × 5 mm copper pads, it delivers R_θJA = 89 °C/W and R_θJC = 22 °C/W, supporting continuous operation up to 150 °C junction temperature under defined thermal conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Maximum repetitive reverse blocking voltage before breakdown; defines usable input voltage range in offline or high-voltage DC-DC stages.
I_F	1 A - Continuous average forward current rating; determines maximum steady-state power handling capability.
t_rr	500 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables efficient operation up to ~200 kHz switching frequencies.
V_F @ 1 A, 25°C	1.06 V (typ), 1.30 V (max) - Directly impacts conduction loss and thermal rise in high-duty-cycle rectification paths.
C_J	8 pF @ 1 MHz, 4 V - Low junction capacitance minimizes capacitive coupling and improves high-frequency noise immunity.
R_θJL	15 °C/W - Junction-to-lead thermal resistance; enables direct thermal path to PCB copper, critical for compact layout reliability.

Pinout & Package

Package: SMAF - Surface-mount, molded plastic case with matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 rated compound, weight ≈ 0.035 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of rectified path; must withstand surge current (I_FSM = 30 A, 8.3 ms).
Cathode	Forward current exit / reverse blocking terminal	Marked by band; carries full reverse voltage (up to 800 V) and defines output polarity in bridge or half-wave configurations.

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability and moisture resistance without hermetic sealing; meets J-STD-020 Level 1 MSL.
Low reverse leakage	≤5 µA at 25°C and rated V_RRM; reduces standby power loss in high-impedance hold-up circuits.
Fast recovery (500 ns)	Enables higher switching frequency operation than standard rectifiers, reducing filter component size in SMPS outputs.
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives; supports environmentally regulated industrial and consumer product certifications.

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Secondary-side synchronous or freewheeling rectification in isolated flyback or forward converters delivering 12–48 V output. IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates at 50–200 kHz switching frequency. Use Value: 500 ns t_rr and 1.06 V V_F minimize conduction and recovery losses, improving efficiency >90% at mid-load.	Use Scenario: DC bus rectification in motor drive inverters converting battery or PV DC to variable-frequency AC. IC Role / Device Role / Timing Role: Input-stage AC line rectification or auxiliary supply generation; handles repetitive 800 V transients. Use Value: 800 V V_RRM and 150 °C T_JMAX ensure robustness against voltage spikes and thermal stress in industrial environments.
General Purpose Power Supply	Industrial Control Module
Use Scenario: Input rectification in wall adapters, LED drivers, and auxiliary power rails for PLCs and sensors. IC Role / Device Role / Timing Role: Standard AC/DC front-end rectifier; mounted directly on FR-4 with 5 mm × 5 mm Cu pad. Use Value: R_θJL = 15 °C/W and 0.035 g weight support compact, thermally efficient layouts without heatsinks.	Use Scenario: Embedded power conditioning in programmable logic controllers and remote I/O modules operating in harsh ambient conditions. IC Role / Device Role / Timing Role: Isolated auxiliary supply rectifier; exposed to wide temperature cycling (-55 °C to +150 °C). Use Value: -55 °C to +150 °C storage/junction range and JESD201 Class 1 whisker resistance ensure field longevity in uncontrolled enclosures.

DC-DC Converter

Switching Inverter

Use Scenario: Secondary-side synchronous or freewheeling rectification in isolated flyback or forward converters delivering 12–48 V output.

IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates at 50–200 kHz switching frequency.

Use Value: 500 ns t_rr and 1.06 V V_F minimize conduction and recovery losses, improving efficiency >90% at mid-load.

Use Scenario: DC bus rectification in motor drive inverters converting battery or PV DC to variable-frequency AC.

IC Role / Device Role / Timing Role: Input-stage AC line rectification or auxiliary supply generation; handles repetitive 800 V transients.

Use Value: 800 V V_RRM and 150 °C T_JMAX ensure robustness against voltage spikes and thermal stress in industrial environments.

General Purpose Power Supply

Industrial Control Module

Use Scenario: Input rectification in wall adapters, LED drivers, and auxiliary power rails for PLCs and sensors.

IC Role / Device Role / Timing Role: Standard AC/DC front-end rectifier; mounted directly on FR-4 with 5 mm × 5 mm Cu pad.

Use Value: R_θJL = 15 °C/W and 0.035 g weight support compact, thermally efficient layouts without heatsinks.

Use Scenario: Embedded power conditioning in programmable logic controllers and remote I/O modules operating in harsh ambient conditions.

IC Role / Device Role / Timing Role: Isolated auxiliary supply rectifier; exposed to wide temperature cycling (-55 °C to +150 °C).

Use Value: -55 °C to +150 °C storage/junction range and JESD201 Class 1 whisker resistance ensure field longevity in uncontrolled 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
STTH1R08	Same 800 V V_RRM, but TO-220AC package; t_rr = 75 ns (faster), V_F = 1.15 V @ 1 A.	Requires through-hole mounting and heatsink; unsuitable for ultra-compact SMT designs.	Select when faster recovery and higher surge tolerance (I_FSM = 50 A) outweigh SMT constraints.
ES1J	SMA package (not SMAF); same 800 V, 1 A, t_rr = 35 ns; V_F = 1.7 V @ 1 A (higher conduction loss).	Higher forward drop increases thermal load; identical footprint but different lead finish and MSL rating.	Prefer only if legacy board design mandates SMA and fastest recovery is prioritized over efficiency.

Compared with STTH1R08 and ES1J, the RS1KF-T offers optimal balance of SMT compatibility, thermal performance (R_θJL = 15 °C/W), and cost-effective 500 ns recovery-ideal for space-constrained industrial power supplies where moderate speed suffices.

Availability

RS1KF-T is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and general-purpose power supplies requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for RS1KF-T 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 RS1KF-T belongs to TSC's RS1x-F fast recovery rectifier family, engineered specifically for high-efficiency, surface-mount power conversion in cost-sensitive yet thermally demanding applications.

FAQ

What is the maximum junction temperature rating for the RS1KF-T?

The RS1KF-T has a maximum junction temperature (T_J) rating of +150 °C, verified per absolute maximum ratings table. This allows continuous operation in high-ambient industrial environments when mounted on a 5 mm × 5 mm copper pad per JEDEC test conditions. Derating curves confirm safe operation down to -55 °C storage temperature. Thermal design must respect R_θJL = 15 °C/W to avoid exceeding this limit under full load.

Does the RS1KF-T have a halogen-free and RoHS-compliant construction?

Yes, the RS1KF-T uses halogen-free molding compound per IEC 61249-2-21 and is fully RoHS compliant. The device carries no restricted substances above threshold limits, and its matte tin-plated leads meet J-STD-002 solderability standards. These attributes are confirmed in the official Taiwan Semiconductor B2103 datasheet revision and supported by TSC's material declarations.

What is the reverse recovery time (t_rr) specification for RS1KF-T and under what test conditions?

The RS1KF-T has a reverse recovery time (t_rr) of 500 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value is specified in the Electrical Specifications table of the B2103 datasheet and applies across the full operating temperature range. It reflects performance in high-frequency switching applications such as SMPS output rectification.

Is the RS1KF-T compatible with automated pick-and-place equipment?

Yes, the RS1KF-T is designed for automated placement per its SMAF package geometry and matte tin-plated leads. It meets J-STD-020 Moisture Sensitivity Level 1, eliminating bake requirements prior to reflow. The device's standardized tape-and-reel packaging (7,500 units per reel) and cathode-band polarity marking further support high-yield SMT assembly lines.

What is the forward voltage (V_F) of RS1KF-T at 1.0 A and 125°C?

The RS1KF-T exhibits a typical forward voltage of 0.92 V and a maximum of 1.23 V at 1.0 A and 125°C, as specified in the Electrical Specifications table. This elevated-temperature V_F is critical for thermal stability analysis in high-ambient applications, and the 0.92 V typ value confirms reduced conduction loss versus room-temperature operation (1.06 V typ at 25°C).

RS1KF-T Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-221AC, SMA Flat Leads

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:: 8pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMAF

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

RS1KF-T FAQ

1.How can I place an order for RS1KF-T through Aetrix?

Please submit a Request for Quotation (RFQ) for RS1KF-T 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 RS1KF-T reliable?

The price and inventory of RS1KF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1KF-T is usually 5 days.

3.What payment methods are accepted for RS1KF-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1KF-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RS1KF-T?

RS1KF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RS1KF-T 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 RS1KF-T?

For technical support, including RS1KF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1KF-T requirements.

6.How does Aetrix verify that RS1KF-T is sourced from the original manufacturer or authorized distributors?

All RS1KF-T 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 RS1KF-T meets industry standards.

7.What is the process for return or replacement of RS1KF-T?

All RS1KF-T units undergo pre-shipment inspection (PSI). If there is an issue with RS1KF-T, 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 RS1KF-T part is unused and in its original packaging.

Return procedure for RS1KF-T:

1.Submit a request within 90 days.

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

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