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

Taiwan Semiconductor Corporation RSFALH

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

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Part No.:: RSFALH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-123

Datasheet:: RSFALH.pdf

Description:: 150NS, 0.5A, 50V, FAST RECOVERY

Quantity:: RFQ Add To RFQ list

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Inventory:3,807

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Product details

Overview

RSFALH from Taiwan Semiconductor is a 0.5A, 50V fast recovery surface-mount rectifier diode in Sub SMA package, featuring AEC-Q101 qualification, glass passivated junction, and 150 ns reverse recovery time-designed for automotive DC-DC converters and snubber circuits.

For engineers reviewing the RSFALH datasheet, RSFALH pinout, RSFALH application, or RSFALH equivalent, key selection criteria include its 50V V_RRM, 10A I_FSM, 1.3V max forward voltage at 0.5A, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 compliance.

Technical Context

The RSFALH is a single-die, unidirectional fast recovery rectifier optimized for high-efficiency switching in automotive and industrial power supplies. Its glass-passivated chip junction ensures stable operation up to 150°C junction temperature and supports automated SMT placement.

With 32°C/W junction-to-case thermal resistance and 150°C/W junction-to-ambient rating, the RSFALH delivers reliable conduction under pulsed loads (8.3ms half-sine, 10A surge) while maintaining low capacitance (4 pF at 1 MHz, 4V reverse bias) for minimal switching loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse voltage; defines safe blocking capability in 50V-rated DC-DC stages
I_F	0.5 A - Continuous forward current rating; suitable for low-power auxiliary rails and LED driver bias paths
I_FSM	10 A - Peak non-repetitive surge current; withstands inrush and transient overloads without failure
t_rr	150 ns - Reverse recovery time; enables efficient operation in 100–500 kHz switching topologies
V_F (max)	1.3 V @ 0.5A, 25°C - Forward voltage drop; determines conduction loss and thermal rise in compact layouts
R_θJC	32 °C/W - Junction-to-case thermal resistance; supports direct PCB copper pad heatsinking for thermal management
Junction Temp	−55°C to +150°C - Operating range; validated for under-hood automotive environments per AEC-Q101

Pinout & Package

Package: Sub SMA - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, cathode band polarity marking, and 0.019g mass.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential side of circuit; requires adequate copper area for thermal dissipation
Cathode	Forward current exit / reverse blocking terminal	Marked by black band; ties to higher-potential node; critical for correct orientation in snubber and flyback clamp paths

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing
Glass passivated junction	Prevents moisture ingress and surface leakage, ensuring long-term stability in humid environments
Moisture sensitivity level 1	No bake required before reflow; compatible with standard SMT assembly lines without dry-pack handling
Fast switching (150 ns t_rr)	Reduces switching losses in high-frequency DC-DC converters and active clamp circuits
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives for environmentally regulated end equipment

Applications

Automotive DC-DC Converters	LED Headlamp Drivers
Use Scenario: Step-down conversion in 12V/48V hybrid vehicle subsystems powering infotainment and ADAS sensors. IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck converters operating at 200–300 kHz. Use Value: 150 ns t_rr minimizes reverse recovery loss; 50V V_RRM matches system bus derating requirements.	Use Scenario: Constant-current regulation and overvoltage protection in adaptive front-lighting systems. IC Role / Device Role / Timing Role: Snubber diode across MOSFET switches to suppress voltage spikes during LED string switching. Use Value: Glass passivation ensures robustness against voltage transients; 10A I_FSM handles repetitive clamp energy.
Industrial Power Supplies	Consumer AC-DC Adapters
Use Scenario: Auxiliary bias supply in programmable logic controllers and motor drive control boards. IC Role / Device Role / Timing Role: Secondary-side rectifier in isolated flyback designs with <1W output requirements. Use Value: Sub SMA footprint enables high-density layout; 150°C T_JMAX supports sealed enclosure operation.	Use Scenario: Low-cost wall adapters for smart home hubs and IoT gateways requiring CE/UL certification. IC Role / Device Role / Timing Role: Input bridge rectifier leg in simplified two-diode half-wave configurations. Use Value: Level 1 MSL eliminates pre-bake steps; halogen-free construction satisfies regional environmental compliance.

Automotive DC-DC Converters

LED Headlamp Drivers

Use Scenario: Step-down conversion in 12V/48V hybrid vehicle subsystems powering infotainment and ADAS sensors.

IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck converters operating at 200–300 kHz.

Use Value: 150 ns t_rr minimizes reverse recovery loss; 50V V_RRM matches system bus derating requirements.

Use Scenario: Constant-current regulation and overvoltage protection in adaptive front-lighting systems.

IC Role / Device Role / Timing Role: Snubber diode across MOSFET switches to suppress voltage spikes during LED string switching.

Use Value: Glass passivation ensures robustness against voltage transients; 10A I_FSM handles repetitive clamp energy.

Industrial Power Supplies

Consumer AC-DC Adapters

Use Scenario: Auxiliary bias supply in programmable logic controllers and motor drive control boards.

IC Role / Device Role / Timing Role: Secondary-side rectifier in isolated flyback designs with <1W output requirements.

Use Value: Sub SMA footprint enables high-density layout; 150°C T_JMAX supports sealed enclosure operation.

Use Scenario: Low-cost wall adapters for smart home hubs and IoT gateways requiring CE/UL certification.

IC Role / Device Role / Timing Role: Input bridge rectifier leg in simplified two-diode half-wave configurations.

Use Value: Level 1 MSL eliminates pre-bake steps; halogen-free construction satisfies regional environmental compliance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06U	600V V_RRM, 1A I_F, TO-277 package, 75 ns t_rr	Higher voltage rating and faster recovery; suited for 400V+ PFC stages	Select when higher blocking voltage or lower switching loss is required; not drop-in due to different package and current rating
ON Semi MUR105	50V V_RRM, 1A I_F, DO-41 through-hole, 75 ns t_rr	Through-hole mounting; faster recovery but larger footprint and no AEC-Q101 qualification	Choose for prototyping or legacy through-hole designs where automotive qualification is not mandatory

Compared with STTH1R06U and MUR105, the RSFALH offers AEC-Q101 compliance and Sub SMA SMT compatibility at 50V/0.5A-making it optimal for space-constrained, automotive-qualified low-voltage rectification where 150 ns recovery suffices.

Availability

RSFALH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converter design, and snubber circuit implementation requiring stable component supply and full traceability.

Supply support for RSFALH 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 automotive, industrial, and consumer markets since 1979.

The RSFALH belongs to TSC's RSF series of AEC-Q101-qualified fast recovery rectifiers, engineered specifically for high-reliability, surface-mount power conversion in automotive and harsh-environment applications.

FAQ

What is the maximum junction temperature rating for RSFALH?

The RSFALH has a maximum junction temperature (T_JMAX) of +150°C, verified per AEC-Q101 stress testing. This rating allows continuous operation in under-hood automotive environments and sealed industrial enclosures. Derating curves in the RSFALH datasheet define allowable average forward current versus ambient temperature, and thermal design must account for R_θJA = 150°C/W in still air or improved cooling via PCB copper area.

Is RSFALH suitable for use in automotive lighting applications?

Yes, RSFALH is explicitly qualified to AEC-Q101 and listed in the Applications section for car lighting. Its glass passivated junction, 150°C T_JMAX, and 10A I_FSM make it suitable for snubber and freewheeling roles in LED headlamp drivers and daytime running light modules. The Sub SMA package supports automated placement on high-density automotive PCBs, and moisture sensitivity level 1 simplifies manufacturing flow.

What does the "ALH" suffix indicate in RSFALH?

The "ALH" suffix in RSFALH identifies the 50V V_RRM variant within the RSF series-"A" denotes 50V, "LH" indicates Sub SMA packaging. Per the ordering table, "x" in RSFxLH maps voltage: ALH=50V, BLH=100V, DLH=200V, etc. This coding is consistent across TSC's RSFALH–RSFMLH family and appears as the marking code "FAL" on the device body.

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

Yes, RSFALH has a maximum reverse recovery time (t_rr) of 150 ns, measured under conditions of I_F = 0.5A, I_R = 1.0A, and I_rr = 0.25A, per the electrical specifications table. This value is confirmed using the test circuit shown in Figure 6 of the RSFALH datasheet and reflects performance at 25°C ambient. The 150 ns t_rr enables efficient operation in switching frequencies up to ~500 kHz.

What is the thermal resistance from junction to ambient for RSFALH?

The junction-to-ambient thermal resistance (R_θJA) for RSFALH is 150°C/W, specified under standard JEDEC test conditions (single-layer 1-inch² copper pad, still air). This value assumes minimal PCB copper; actual R_θJA improves significantly with added thermal vias and internal ground/power planes. For thermal design, combine R_θJA with power dissipation (P = V_F × I_F) to estimate junction temperature rise above ambient.

RSFALH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 500mA

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 500 mA

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 150 ns

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

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Sub SMA

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

RSFALH FAQ

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

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

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

3.What payment methods are accepted for RSFALH?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RSFALH?

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

Once your RSFALH 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 RSFALH?

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

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

All RSFALH 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 RSFALH meets industry standards.

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

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

Return procedure for RSFALH:

1.Submit a request within 90 days.

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

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