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

Taiwan Semiconductor Corporation RS1B

Name: RS1B
Brand: Taiwan Semiconductor Corporation
SKU: RS1B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RS1B

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: RS1B.pdf

Description:: DIODE GEN PURP 100V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RS1B from Taiwan Semiconductor is a fast recovery surface-mount silicon rectifier diode rated for 100 V repetitive peak reverse voltage, 1 A average forward current, and 30 A non-repetitive surge current, with 150 ns reverse recovery time and 1.3 V max forward voltage at 1 A - used in DC-DC converters and snubber networks.

For engineers reviewing the RS1B datasheet, RS1B pinout, RS1B application, or RS1B equivalent, key selection criteria include its DO-214AC (SMA) package, 100 V V_RRM, 150 ns trr, thermal resistance (R_θJA = 105 °C/W), and RoHS/halogen-free compliance for high-efficiency switching power supplies.

Technical Context

The RS1B operates as a single-die, unidirectional fast recovery rectifier with glass-passivated junction for stable performance under transient stress. Its 150 ns reverse recovery time and 10 pF junction capacitance support high-frequency switching up to several hundred kHz in SMPS topologies.

Thermal design relies on R_θJL = 30 °C/W to lead and R_θJA = 105 °C/W to ambient, enabling 1 A continuous conduction at ≤75 °C board temperature. Polarity is marked by cathode band per JEDEC DO-214AC outline.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - maximum repetitive reverse blocking voltage; defines usable input range in 12–48 V DC-DC stages
I_F	1 A - continuous average forward current; supports output rectification up to ~12 W at 12 V with adequate heatsinking
I_FSM	30 A - 8.3 ms half-sine surge rating; handles inrush and fault transients without failure
t_rr	150 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables >200 kHz switching with low recovery loss
V_F (max)	1.3 V @ 1 A, 25°C - forward drop determines conduction loss; ~1.3 W dissipation at full load
Junction temp	−55°C to +175°C - wide operating range supports industrial and automotive under-hood environments
C_J	10 pF @ 1 MHz, 4 V - low capacitance minimizes switching node ringing in high-dV/dt circuits

Pinout & Package

DO-214AC (SMA) surface-mount package: molded plastic body, matte tin-plated leads, cathode indicated by band, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated compound, weight ≈0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node in flyback secondary or buck freewheel path)
Cathode	Forward current exit / reverse blocking terminal	Marked by band; ties to output rail or filter capacitor positive; blocks reverse voltage up to 100 V

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in IPC Class 2 environments
Fast recovery (150 ns)	Reduces reverse recovery charge (Q_rr) and associated switching losses vs. standard rectifiers, improving efficiency in 100–500 kHz converters
DO-214AC (SMA) footprint	Standardized land pattern supports automated pick-and-place and reflow; compatible with IPC-7351B SMA generic pad layout
RoHS & halogen-free	Meets EU Directive 2011/65/EU and IEC 61249-2-21; eliminates brominated flame retardants for safer end-of-life processing

Applications

DC-DC Converter Output Rectification	Snubber Network Diode
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of secondary winding voltage. Use Value: 150 ns t_rr and 1.3 V V_F minimize conduction and recovery losses, sustaining >88% efficiency at 250 kHz switching.	Use Scenario: Clamp diode in RCD snubber across MOSFET drain and primary winding in flyback or forward topologies. IC Role / Device Role / Timing Role: Fast turn-on to divert leakage inductance energy during MOSFET turn-off; blocks reflected voltage during MOSFET on-time. Use Value: Low C_J (10 pF) prevents capacitive loading of snubber RC time constant; 100 V V_RRM accommodates typical 2× reflected voltage margins.
Switching Mode Inverter Stage	Lighting Driver Freewheel Path
Use Scenario: Output rectification in 100–300 W offline inverters converting DC bus to 50/60 Hz AC via H-bridge. IC Role / Device Role / Timing Role: Synchronous or asynchronous freewheeling diode in half-bridge leg; conducts during dead-time and shoot-through prevention intervals. Use Value: 30 A I_FSM withstands short-circuit surges; 175 °C T_JMAX allows operation near heatsink limits in compact enclosures.	Use Scenario: Freewheel path in constant-current LED drivers using buck or boost topology at 100–1000 mA output. IC Role / Device Role / Timing Role: Provides current continuity during switch off-time; shapes inductor current waveform to maintain steady LED flux. Use Value: 1 A I_F rating matches common driver currents; low V_F reduces thermal load on PCB copper, preserving lumen maintenance.

DC-DC Converter Output Rectification

Snubber Network Diode

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at ≤1 A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of secondary winding voltage.

Use Value: 150 ns t_rr and 1.3 V V_F minimize conduction and recovery losses, sustaining >88% efficiency at 250 kHz switching.

Use Scenario: Clamp diode in RCD snubber across MOSFET drain and primary winding in flyback or forward topologies.

IC Role / Device Role / Timing Role: Fast turn-on to divert leakage inductance energy during MOSFET turn-off; blocks reflected voltage during MOSFET on-time.

Use Value: Low C_J (10 pF) prevents capacitive loading of snubber RC time constant; 100 V V_RRM accommodates typical 2× reflected voltage margins.

Switching Mode Inverter Stage

Lighting Driver Freewheel Path

Use Scenario: Output rectification in 100–300 W offline inverters converting DC bus to 50/60 Hz AC via H-bridge.

IC Role / Device Role / Timing Role: Synchronous or asynchronous freewheeling diode in half-bridge leg; conducts during dead-time and shoot-through prevention intervals.

Use Value: 30 A I_FSM withstands short-circuit surges; 175 °C T_JMAX allows operation near heatsink limits in compact enclosures.

Use Scenario: Freewheel path in constant-current LED drivers using buck or boost topology at 100–1000 mA output.

IC Role / Device Role / Timing Role: Provides current continuity during switch off-time; shapes inductor current waveform to maintain steady LED flux.

Use Value: 1 A I_F rating matches common driver currents; low V_F reduces thermal load on PCB copper, preserving lumen maintenance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	100 V V_RRM, 1 A I_F, 35 ns t_rr, TO-277 package	Lower t_rr improves high-frequency efficiency but requires different footprint and thermal interface	Preferred where <50 ns recovery is required and board redesign is acceptable
MBR1100	100 V V_RRM, 1 A I_F, Schottky structure, 0.85 V V_F, DO-214AC	Lower forward drop reduces conduction loss but higher leakage (>100 µA @ 125°C) limits high-temp use	Best for low-voltage, high-efficiency designs below 100°C ambient

Compared with STTH1R04 and MBR1100, the RS1B offers balanced trade-offs: moderate t_rr (150 ns) and V_F (1.3 V) in a widely adopted DO-214AC package, supporting cost-sensitive industrial and lighting applications without requiring layout changes or derating for leakage.

Availability

RS1B is available at Aetrix Electronics and suitable for DC-DC converters, snubber networks, and lighting drivers requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.

Supply support for RS1B 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 electronics markets since 1979.

The RS1B belongs to TSC's RS1x fast recovery rectifier family, engineered for high-efficiency switching power supplies where fast t_rr, stable V_F, and robust thermal performance are critical in space-constrained surface-mount designs.

FAQ

What is the maximum junction temperature rating for RS1B?

The RS1B has a maximum junction temperature (T_J) rating of +175°C, allowing reliable operation in high-ambient environments such as enclosed industrial power supplies or under-hood automotive modules. This rating is validated per TSC's M2304 specification revision and applies across the full −55°C to +175°C storage range. The RS1B maintains electrical integrity up to this limit when thermal design respects R_θJA = 105 °C/W.

Does RS1B have a halogen-free and RoHS-compliant construction?

Yes, the RS1B uses halogen-free molding compound and meets RoHS Directive 2011/65/EU requirements. Its matte tin-plated leads comply with J-STD-002 solderability standards, and the entire assembly passes JESD201 Class 2 whisker testing. These attributes are confirmed in TSC's M2304 datasheet revision and apply specifically to the RS1B variant within the RS1x family.

What is the reverse recovery time (t_rr) of RS1B and how is it measured?

The RS1B has a reverse recovery time (t_rr) of 150 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per TSC's M2304 test methodology. This value is specified in the Electrical Specifications table and distinguishes RS1B from slower variants like RS1J (250 ns) and faster alternatives such as STTH1R04 (35 ns).

Can RS1B be used as a direct replacement for RS1A in a 50 V design?

No - RS1B is not a direct replacement for RS1A in a 50 V design because it is rated for 100 V V_RRM, not 50 V. While electrically functional, over-specifying voltage rating may increase V_F slightly and does not reduce cost or size. RS1A remains optimal for 50 V systems; RS1B should be selected only where 100 V blocking margin is required per safety or transient design rules.

What package type does RS1B use and what are its key mechanical features?

The RS1B uses the DO-214AC (SMA) surface-mount package, defined per JEDEC DO-214 Variation AC. Key mechanical features include UL 94V-0 flammability-rated epoxy, cathode polarity indicated by a visible band, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 (MSL-1). Its dimensions match IPC-7351B SMA generic footprint for seamless placement.

RS1B 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):: 100 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 @ 100 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

RS1B FAQ

1.How can I place an order for RS1B through Aetrix?

Please submit a Request for Quotation (RFQ) for RS1B 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 RS1B reliable?

The price and inventory of RS1B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1B is usually 5 days.

3.What payment methods are accepted for RS1B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RS1B?

RS1B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RS1B 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 RS1B?

For technical support, including RS1B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1B requirements.

6.How does Aetrix verify that RS1B is sourced from the original manufacturer or authorized distributors?

All RS1B 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 RS1B meets industry standards.

7.What is the process for return or replacement of RS1B?

All RS1B units undergo pre-shipment inspection (PSI). If there is an issue with RS1B, 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 RS1B part is unused and in its original packaging.

Return procedure for RS1B:

1.Submit a request within 90 days.

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

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