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

Taiwan Semiconductor Corporation RS1A

Name: RS1A
Brand: Taiwan Semiconductor Corporation
SKU: RS1A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RS1A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: RS1A.pdf

Description:: DIODE GEN PURP 50V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RS1A from Taiwan Semiconductor is a 1 A, 50 V repetitive peak reverse voltage (V_RRM) fast recovery surface-mount rectifier in DO-214AC (SMA) package, featuring 150 ns reverse recovery time (t_rr), 1.3 V max forward voltage at 1 A, and 5 µA max reverse leakage at 25°C. It serves as a primary AC/DC input rectifier in compact DC-DC converters.

For engineers reviewing the RS1A datasheet, RS1A pinout, RS1A application, or RS1A equivalent, key selection criteria include its fast recovery performance, moisture sensitivity level 1 compliance, RoHS/halogen-free status, and suitability for automated SMT assembly in space-constrained power supplies.

Technical Context

The RS1A is a single-die, unidirectional silicon PN junction rectifier optimized for high-frequency switching operation. Its 150 ns t_rr enables efficient operation in 50–500 kHz SMPS topologies, while the glass-passivated junction ensures stable leakage and long-term reliability under thermal cycling.

Thermal design is supported by R_θJA = 105°C/W and R_θJL = 30°C/W, with maximum junction temperature rated to +175°C. The device operates across –55°C to +175°C storage and junction ranges, and its matte tin-plated leads meet J-STD-002 solderability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum non-repetitive reverse voltage the device blocks without breakdown; defines minimum input voltage derating margin in bridge or half-wave rectifier designs.
I_F	1 A continuous - Rated average forward current at TA = 75°C; determines heatsinking requirements in sustained-load applications.
t_rr	150 ns - Measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables low switching loss in high-frequency converters up to ~500 kHz.
V_F (max)	1.3 V at IF = 1 A, TJ = 25°C - Directly impacts conduction loss and thermal rise in output rectification stages.
I_R (max)	5 µA at VR = 50 V, TJ = 25°C - Low leakage preserves efficiency in standby and light-load conditions; rises to 50 µA at 125°C.
Junction temp	+175°C max - Allows operation in high-ambient environments (e.g., enclosed LED drivers or industrial power modules) without thermal shutdown.
C_J	10 pF at 1 MHz, VR = 4 V - Limits high-frequency noise coupling and EMI generation during commutation.

Pinout & Package

DO-214AC (SMA) surface-mount package: molded plastic body per JEDEC DO-214AC, polarity indicated by cathode band, matte tin-plated leads, UL 94V-0 rated compound, weight ≈ 0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC input or transformer secondary; must withstand I_FSM = 30 A surge (8.3 ms half-sine).
Cathode	Forward current exit / reverse voltage reference	Marked by band; ties to output capacitor or ground return; reverse voltage applied here during off-state.

Key Features

Feature	Design Value
Glass passivated junction	Prevents surface contamination and ion migration, ensuring stable V_F and I_R over 10+ year field life in humid environments.
Fast recovery (150 ns)	Reduces switching losses vs. standard rectifiers (e.g., 1N400x), enabling higher frequency operation without added snubbers.
Moisture sensitivity level 1	Eliminates bake-out requirement before reflow; compatible with standard J-STD-020 Class 1 handling and storage protocols.
RoHS & halogen-free	Meets IPC-1752A material declaration requirements for consumer, industrial, and lighting products sold in EU/Asia markets.
Automated placement compatible	DO-214AC footprint and lead geometry support high-yield pick-and-place at >25,000 UPH on modern SMT lines.

Applications

DC-DC Converter Input Rectification	LED Driver Snubber Circuit
Use Scenario: AC line input rectification feeding a flyback controller IC in a 12 V/1 A isolated LED driver. IC Role / Device Role / Timing Role: Primary-side unidirectional current path; conducts during positive half-cycle, blocks reverse voltage during negative half-cycle and flyback reset. Use Value: 150 ns t_rr minimizes overlap loss with MOSFET switching edge, improving overall efficiency by ~1.2% vs. 1N4937 at 65 kHz.	Use Scenario: Bidirectional voltage clamping across a MOSFET drain-source node in a constant-current LED buck driver. IC Role / Device Role / Timing Role: Fast turn-on diode absorbing inductive kickback energy during MOSFET turn-off; limits dV/dt stress on switch. Use Value: Low C_J (10 pF) and fast t_rr prevent oscillatory ringing, reducing EMI filter component count by one 100 nF X-cap.
Switching Mode Inverter Auxiliary Supply	General-Purpose SMT Rectification
Use Scenario: Generating +15 V bias rail from inverter DC bus for gate drivers and control logic in a 3-phase motor drive. IC Role / Device Role / Timing Role: Half-wave rectifier feeding linear regulator; handles intermittent load surges up to 30 A I_FSM. Use Value: 175°C T_JMAX allows uninterrupted operation when ambient reaches 105°C inside sealed inverter enclosure.	Use Scenario: Low-cost, board-level AC adapter rectification in consumer IoT hub power supply (5 V/0.5 A output). IC Role / Device Role / Timing Role: General-purpose unidirectional current valve; replaces axial-leaded 1N4001 where space and automation are constraints. Use Value: DO-214AC footprint reduces PCB area by 65% vs. DO-41; J-STD-002-compliant leads ensure >99.98% first-pass solder joint yield.

DC-DC Converter Input Rectification

LED Driver Snubber Circuit

Use Scenario: AC line input rectification feeding a flyback controller IC in a 12 V/1 A isolated LED driver.

IC Role / Device Role / Timing Role: Primary-side unidirectional current path; conducts during positive half-cycle, blocks reverse voltage during negative half-cycle and flyback reset.

Use Value: 150 ns t_rr minimizes overlap loss with MOSFET switching edge, improving overall efficiency by ~1.2% vs. 1N4937 at 65 kHz.

Use Scenario: Bidirectional voltage clamping across a MOSFET drain-source node in a constant-current LED buck driver.

IC Role / Device Role / Timing Role: Fast turn-on diode absorbing inductive kickback energy during MOSFET turn-off; limits dV/dt stress on switch.

Use Value: Low C_J (10 pF) and fast t_rr prevent oscillatory ringing, reducing EMI filter component count by one 100 nF X-cap.

Switching Mode Inverter Auxiliary Supply

General-Purpose SMT Rectification

Use Scenario: Generating +15 V bias rail from inverter DC bus for gate drivers and control logic in a 3-phase motor drive.

IC Role / Device Role / Timing Role: Half-wave rectifier feeding linear regulator; handles intermittent load surges up to 30 A I_FSM.

Use Value: 175°C T_JMAX allows uninterrupted operation when ambient reaches 105°C inside sealed inverter enclosure.

Use Scenario: Low-cost, board-level AC adapter rectification in consumer IoT hub power supply (5 V/0.5 A output).

IC Role / Device Role / Timing Role: General-purpose unidirectional current valve; replaces axial-leaded 1N4001 where space and automation are constraints.

Use Value: DO-214AC footprint reduces PCB area by 65% vs. DO-41; J-STD-002-compliant leads ensure >99.98% first-pass solder joint yield.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR105	V_RRM = 50 V, t_rr = 75 ns, V_F = 1.25 V (typ), R_θJA = 110°C/W	Lower t_rr improves high-frequency efficiency but increases cost; slightly higher thermal resistance requires larger copper pour.	Preferred when operating above 300 kHz or where <100 ns t_rr is mandated by EMI limits.
Vishay VS-1EWH05	V_RRM = 50 V, t_rr = 200 ns, V_F = 1.35 V (max), R_θJA = 100°C/W, AEC-Q200 qualified	Slower recovery but automotive-qualified; tighter V_F distribution and extended temperature validation.	Required for automotive body electronics or industrial controls needing AEC-Q200 or extended qualification evidence.

Compared with RS1A, MUR105 offers faster switching at modest cost premium and slightly reduced thermal margin, while VS-1EWH05 trades speed for automotive-grade reliability and tighter parametric consistency-neither is pin-compatible but both fit DO-214AC footprints.

Availability

RS1A is available at Aetrix Electronics and suitable for DC-DC converters, LED lighting drivers, and snubber circuits requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for RS1A 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, industrial, and consumer markets since 1979.

The RS1A belongs to TSC's RS1x fast rectifier product line, engineered specifically for high-efficiency, surface-mount AC/DC and DC/DC conversion in space-constrained, thermally demanding applications.

FAQ

What is the maximum repetitive peak reverse voltage rating for RS1A?

The RS1A has a maximum repetitive peak reverse voltage (V_RRM) of 50 V, verified per TSC M2304 datasheet Section 1. This rating defines the highest reverse voltage the device can block continuously without avalanche breakdown under specified thermal conditions. Exceeding 50 V risks irreversible junction failure. Derating to ≤35 V is recommended for designs operating near maximum junction temperature.

Does RS1A support automated SMT assembly, and what is its moisture sensitivity level?

Yes, RS1A supports automated SMT assembly per its DO-214AC (SMA) package geometry and matte tin-plated leads compliant with J-STD-002. Its moisture sensitivity level is Level 1 (per J-STD-020), meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow. No floor life limitation applies, simplifying manufacturing logistics.

What is the reverse recovery time (t_rr) of RS1A, and under what test conditions is it measured?

The RS1A reverse recovery time is 150 ns, measured under the condition: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per TSC M2304 datasheet Section 2. This value reflects the time required for minority carriers to clear after forward conduction ceases, directly impacting switching loss in high-frequency converters. It is not guaranteed beyond 150 ns at elevated temperatures.

Is RS1A RoHS compliant and halogen-free, and does it meet UL flammability standards?

Yes, RS1A is RoHS compliant and halogen-free per TSC M2304 documentation. Its molded plastic body meets UL 94V-0 flammability rating, confirmed in the Mechanical Data section. These attributes satisfy regulatory requirements for consumer, industrial, and commercial lighting applications sold in EU, North America, and Asia-Pacific markets.

What is the junction-to-ambient thermal resistance (R_θJA) of RS1A, and how does it affect PCB layout?

The RS1A has a junction-to-ambient thermal resistance (R_θJA) of 105°C/W, measured on a standard FR-4 board with 1 in² copper pad (JEDEC 51-7). To maintain T_J ≤ 125°C at I_F = 1 A, the PCB must provide ≥0.5 in² of 2-oz copper connected to both terminals. Reducing R_θJA below 105°C/W requires thermal vias and internal ground planes-critical for high-density LED driver layouts.

RS1A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 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):: 150 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 10pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

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

RS1A FAQ

1.How can I place an order for RS1A through Aetrix?

Please submit a Request for Quotation (RFQ) for RS1A 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 RS1A reliable?

The price and inventory of RS1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1A is usually 5 days.

3.What payment methods are accepted for RS1A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RS1A?

RS1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RS1A 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 RS1A?

For technical support, including RS1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1A requirements.

6.How does Aetrix verify that RS1A is sourced from the original manufacturer or authorized distributors?

All RS1A 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 RS1A meets industry standards.

7.What is the process for return or replacement of RS1A?

All RS1A units undergo pre-shipment inspection (PSI). If there is an issue with RS1A, 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 RS1A part is unused and in its original packaging.

Return procedure for RS1A:

1.Submit a request within 90 days.

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

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