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Taiwan Semiconductor Corporation RS1AL
- Part No.:
- RS1AL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-219AB
- Datasheet:
-
RS1AL.pdf
- Description:
- DIODE GEN PURP 50V 800MA SUB SMA
- Quantity:
- Payment:
- Shipping:
Inventory:29,450
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Product details
Overview
RS1AL from Taiwan Semiconductor is a fast recovery surface mount rectifier with 50 V repetitive peak reverse voltage (VRRM), 0.8 A average forward current (IF), and 150 ns reverse recovery time (trr), designed for high-efficiency DC-DC converters and switching mode power supplies.
For engineers reviewing the RS1AL datasheet, RS1AL pinout, RS1AL application, or RS1AL equivalent, key selection criteria include its Sub SMA package compatibility, 1.3 V max forward voltage at 0.8 A, 30 A non-repetitive surge rating, and J-STD-020 Level 1 moisture sensitivity for automated assembly.
Technical Context
The RS1AL is a single-die, unidirectional silicon rectifier optimized for fast switching in medium-frequency SMPS topologies. Its glass-passivated junction ensures stable performance across -55°C to +150°C operating junction temperature range and supports reliable operation under repetitive surge conditions up to 30 A (8.3 ms half-sine).
Thermal design is supported by a 32°C/W junction-to-lead thermal resistance (RθJL) and 105°C/W junction-to-ambient rating (RθJA). The device exhibits low junction capacitance (10 pF at 1 MHz, 4 V reverse bias) and tight reverse leakage control-5 µA at 25°C and 50 µA at 125°C under rated VRRM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe DC/AC peak voltage handling in rectification paths |
| IF | 0.8 A - Continuous average forward current; sets maximum steady-state power delivery capability |
| trr | 150 ns - Measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables efficient operation up to ~1–2 MHz switching frequencies |
| VF (max) | 1.3 V - Forward voltage drop at 0.8 A and 25°C; directly impacts conduction loss and thermal load in high-duty-cycle designs |
| IFSM | 30 A - Non-repetitive peak surge current (8.3 ms half-sine); supports inrush and fault transient resilience |
| RθJL | 32 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pour thermal coupling for heatsinking |
| Moisture Sensitivity | Level 1 per J-STD-020 - No floor life limitation; suitable for standard SMT reflow without dry pack or baking |
Pinout & Package
Package: Sub SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, cathode band polarity marking, and 0.019 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of input source (e.g., transformer secondary or switch node) |
| Cathode | Forward current exit point | Connected to output rail or filter capacitor; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability and humidity resistance without requiring conformal coating in industrial environments |
| Fast recovery (150 ns) | Reduces switching losses and EMI generation compared to standard rectifiers in 100 kHz–1 MHz SMPS designs |
| Sub SMA package | Enables high-density layout and compatibility with automated pick-and-place systems using standard 0.5 mm pitch feeders |
| J-STD-020 Level 1 rating | Eliminates pre-bake requirements and simplifies manufacturing flow for high-volume production |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for consumer, industrial, and telecom end equipment |
Applications
| DC-DC Converter | Switching Mode Inverter |
|---|---|
Use Scenario: Secondary-side synchronous rectification in isolated flyback or forward converters delivering 5–24 V outputs at ≤10 W. IC Role / Device Role / Timing Role: Unidirectional power diode conducting during transformer reset phase; replaces Schottky where higher VRRM margin is needed. Use Value: 150 ns trr minimizes reverse recovery loss while 50 V VRRM provides 2× safety margin over 24 V output rails. | Use Scenario: Output freewheeling path in half-bridge motor drive inverters for small appliances and fans. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during MOSFET off-time in 20–100 kHz PWM stages. Use Value: Low 1.3 V VF reduces conduction loss at 0.8 A continuous load; Sub SMA footprint fits compact gate driver PCBs. |
| General Purpose Rectification | AC-DC Auxiliary Supply |
Use Scenario: Input bridge rectification in low-power wall adapters (<5 W) and IoT sensor node power inputs. IC Role / Device Role / Timing Role: Single-phase rectifier converting 12–24 V AC or 12 V RMS transformer output to pulsating DC. Use Value: 30 A IFSM withstands cold-start surges; glass passivation ensures stability in humid indoor environments. | Use Scenario: Bias supply rectification in industrial PLC I/O modules requiring isolated 3.3 V or 5 V auxiliary rails. IC Role / Device Role / Timing Role: Low-current rectifier feeding linear regulator or buck converter input in always-on auxiliary power domains. Use Value: 5 µA max IR at 25°C prevents standby current leakage; 150°C TJMAX supports operation near hot microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0520L | Schottky, 20 V VRRM, 0.5 A IF, 0.45 V VF, no reverse recovery | Lower voltage rating and current; unsuitable for 50 V circuits | Select only if system VIN ≤ 15 V and efficiency >0.3% gain justifies derating |
| 1N4933 | Standard recovery, 200 V VRRM, 1 A IF, 500 ns trr, DO-41 through-hole | Slower switching, larger footprint, incompatible with SMT automation | Use only for legacy through-hole repair or low-frequency (<50 kHz) line-powered supplies |
Compared with MBR0520L and 1N4933, the RS1AL uniquely balances 50 V blocking, 0.8 A current, 150 ns speed, and Sub SMA SMT compatibility-making it optimal for space-constrained, medium-frequency DC-DC stages where Schottky voltage limits or through-hole constraints rule out alternatives.
Availability
RS1AL is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and general-purpose rectification requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for RS1AL 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 industrial, computing, and consumer markets since 1979.
The RS1AL belongs to TSC's RS1xL fast recovery rectifier family, engineered specifically for high-efficiency, surface-mount power conversion in cost-sensitive, high-volume power supply designs.
FAQ
What is the maximum junction temperature rating for the RS1AL?
The RS1AL has a maximum junction temperature (TJ) rating of +150°C, with a storage temperature range of -55°C to +150°C. This allows reliable operation in thermally demanding environments such as enclosed power supplies or near heat-generating ICs. Derating curves in the datasheet confirm usable current capacity down to 0.4 A at 125°C ambient when mounted on standard FR-4 with minimal copper.
Does the RS1AL have a specified reverse recovery time, and how is it measured?
Yes, the RS1AL has a specified reverse recovery time (trr) of 150 ns, measured under standardized conditions: IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A, and TJ = 25°C. This value is confirmed in the Electrical Specifications table and validated via the test circuit diagram in Figure 6 of the RS1AL–RS1ML datasheet revision N2103.
Is the RS1AL RoHS and halogen-free compliant?
Yes, the RS1AL is RoHS compliant and halogen-free per IEC 61249-2-21. These compliance statements are explicitly documented in the FEATURES section of the official Taiwan Semiconductor datasheet (Version N2103), and the device carries appropriate markings to support regulatory documentation for CE, FCC, and other regional certifications.
What is the moisture sensitivity level (MSL) of the RS1AL, and what does it mean for assembly?
The RS1AL is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry packing or baking prior to reflow soldering. This simplifies SMT line logistics and eliminates yield risk from moisture-induced popcorning during standard lead-free reflow profiles.
How does the RS1AL differ from higher-voltage variants like RS1ML in the same family?
The RS1AL differs from RS1ML primarily in its 50 V VRRM rating versus RS1ML's 1000 V rating-both share identical Sub SMA packaging, 0.8 A IF, 30 A IFSM, and thermal characteristics. The RS1AL is optimized for low-voltage secondary-side rectification, while RS1ML targets primary-side or high-line AC-DC applications; substitution requires strict voltage margin verification.
RS1AL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-219AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 800mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 800 mA
- 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:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1AL FAQ
1.How can I place an order for RS1AL through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1AL 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 RS1AL reliable?
The price and inventory of RS1AL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1AL is usually 5 days.
3.What payment methods are accepted for RS1AL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1AL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1AL?
RS1AL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1AL 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 RS1AL?
For technical support, including RS1AL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1AL requirements.
6.How does Aetrix verify that RS1AL is sourced from the original manufacturer or authorized distributors?
All RS1AL 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 RS1AL meets industry standards.
7.What is the process for return or replacement of RS1AL?
All RS1AL units undergo pre-shipment inspection (PSI). If there is an issue with RS1AL, 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 RS1AL part is unused and in its original packaging.
Return procedure for RS1AL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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