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Taiwan Semiconductor Corporation RS1GAL
- Part No.:
- RS1GAL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
RS1GAL.pdf
- Description:
- DIODE GEN PURP 400V 1A THIN SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,000
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Product details
Overview
RS1GAL from Taiwan Semiconductor is a 1 A, 400 V fast recovery surface-mount rectifier diode in a Thin SMA package, featuring 150 ns reverse recovery time, 0.97 V forward voltage at 1.0 A/25°C, and 175°C maximum junction temperature. It serves as a primary output rectifier in DC-DC converters and switching-mode power supplies where efficiency and thermal robustness are critical.
For engineers reviewing the RS1GAL datasheet, RS1GAL pinout, RS1GAL application, or RS1GAL equivalent, key selection criteria include its 400 V repetitive peak reverse voltage, low-profile Thin SMA footprint, 30 A surge current rating, and verified performance at 125°C junction temperature in high-frequency switching topologies.
Technical Context
The RS1GAL is a single-die, glass-passivated silicon PN junction rectifier optimized for fast recovery (trr ≤ 150 ns) and low conduction loss. Its design targets high-frequency switching applications requiring minimal reverse recovery charge (Qrr) and stable VF across temperature.
Thermal performance is defined by RθJL = 19°C/W and RθJA = 81°C/W on a 5 mm × 5 mm copper pad PCB, enabling reliable operation up to 175°C junction temperature without derating under typical board-level cooling conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 375–400 V DC bus applications |
| IF | 1 A continuous - Rated average forward current; supports sustained 1 A output in compact SMPS designs |
| trr | ≤150 ns - Fast recovery time reduces switching losses and EMI in >100 kHz converters |
| VF @ 1A/25°C | 0.97 V - Low forward drop improves system efficiency and minimizes heat generation at full load |
| IFSM (8.3 ms) | 30 A - Surge capability handles inrush and transient overloads without failure |
| TJ max | +175°C - Enables operation in high-ambient environments such as enclosed industrial power supplies |
| CJ @ 4V | 7 pF - Low junction capacitance limits displacement current and improves high-frequency noise immunity |
Pinout & Package
Package: Thin SMA (JEDEC DO-221AC variation), surface-mount, cathode-indicated by band, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail; polarity marked by visible band; determines unidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability and humidity resistance without hermetic sealing |
| Low profile Thin SMA package | Enables ultra-thin power supply designs (<1.25 mm height) and automated SMT placement |
| Fast recovery (≤150 ns) | Reduces switching losses and improves efficiency in 100–500 kHz SMPS topologies |
| J-STD-020 Level 1 moisture sensitivity | Eliminates bake requirements prior to reflow, simplifying manufacturing flow |
| RoHS & halogen-free compliance | Meets global environmental regulations for industrial and consumer end equipment |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Auxiliary Supply |
|---|---|
Use Scenario: Secondary-side rectification in isolated 12 V/1 A buck-derived DC-DC modules for FPGA or ASIC core power. IC Role / Device Role / Timing Role: Unidirectional current steering device converting high-frequency AC from transformer secondary to regulated DC output. Use Value: 0.97 V VF at 1 A minimizes conduction loss; 150 ns trr prevents cross-conduction in synchronous rectifier control schemes. | Use Scenario: Bias supply rectification for gate drivers and control ICs in motor drive inverters with 400 V DC link. IC Role / Device Role / Timing Role: Isolated auxiliary power rectifier delivering clean 15 V/0.5 A to isolated gate driver stages. Use Value: 400 V VRRM provides 2× safety margin over 200 V RMS auxiliary winding; 175°C TJ rating ensures stability near IGBT heatsinks. |
| Industrial AC-DC Adapter Front-End | LED Driver Constant Current Stage |
Use Scenario: Input bridge replacement in universal-input (85–265 VAC) 15 W industrial adapters using active clamp flyback. IC Role / Device Role / Timing Role: Fast-recovery discrete rectifier replacing slower general-purpose diodes in high-efficiency front-end rectification. Use Value: 30 A IFSM withstands cold-start surges; 81°C/W RθJA allows thermal management on standard FR4 without heatsink. | Use Scenario: Constant-current regulation loop rectifier in dimmable LED drivers with PWM-controlled secondary-side sensing. IC Role / Device Role / Timing Role: Precision rectifier element in feedback path ensuring accurate current mirror reference under high-frequency modulation. Use Value: 7 pF CJ minimizes phase shift in analog feedback paths; low IR (≤1 µA @ 25°C) preserves current-sense accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R04 | Same 1 A / 400 V rating; trr = 45 ns (faster); VF = 1.15 V @ 1 A (higher); TO-220AC package | Requires through-hole mounting and heatsinking; unsuitable for ultra-thin SMT designs | Select when faster recovery outweighs board space constraints and thermal budget permits larger package |
| ES1D | Same Thin SMA package; 1 A / 200 V rating; trr = 35 ns; VF = 0.95 V @ 1 A | Limited to ≤200 V circuits; insufficient for 375 V DC bus or 400 V PFC outputs | Select only for sub-200 V applications where lowest VF and fastest trr are prioritized over voltage margin |
Compared with STTH1R04 and ES1D, the RS1GAL uniquely balances 400 V blocking, 150 ns recovery, SMT compatibility, and thermal robustness-making it optimal for space-constrained, medium-voltage industrial SMPS where package size and voltage margin are non-negotiable.
Availability
RS1GAL is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter auxiliary supplies, and industrial AC-DC adapter front-ends requiring stable component supply and consistent parametric performance across production lots.
Supply support for RS1GAL 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, specializing in power rectifiers, TVS devices, and MOSFETs for industrial and computing markets.
The RS1GAL belongs to TSC's RS1xAL fast recovery rectifier family, engineered specifically for high-efficiency, high-density switching power supplies where low VF, fast trr, and SMT manufacturability are jointly required.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of the RS1GAL?
The RS1GAL has a VRRM rating of 400 V, meaning it can reliably block up to 400 V of reverse voltage in repetitive duty cycles. This value is confirmed in the Absolute Maximum Ratings table and applies across the full operating temperature range (−55°C to +175°C). The RS1GAL is not rated for 600 V or higher-those voltages apply to RS1JAL and higher variants in the same family.
What is the forward voltage (VF) of the RS1GAL at 1.0 A and 25°C?
The RS1GAL exhibits a typical forward voltage of 0.97 V at 1.0 A and 25°C, with a maximum of 1.30 V under the same conditions. This value is measured per the Electrical Specifications table and reflects conduction loss under standard test pulse conditions (PW = 0.3 ms). At 125°C, VF drops to 0.83 V typical due to semiconductor physics.
Does the RS1GAL have a specified reverse recovery time (trr)?
Yes, the RS1GAL has a maximum reverse recovery time (trr) of 150 ns, tested at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This parameter is explicitly listed in the Electrical Specifications table and distinguishes RS1GAL from slower variants like RS1JAL (250 ns) and RS1KAL (500 ns) in the same family.
What package type does the RS1GAL use, and what are its key mechanical features?
The RS1GAL uses the Thin SMA package (JEDEC DO-221AC variation), measuring 4.40 mm × 2.70 mm × 1.20 mm. Key features include glass passivation, matte tin-plated leads compliant with J-STD-002, cathode band marking, moisture sensitivity level 1, and UL 94V-0 molding compound-enabling direct SMT assembly without pre-baking.
Is the RS1GAL RoHS and halogen-free compliant?
Yes, the RS1GAL is both RoHS compliant and halogen-free, as explicitly stated in the FEATURES section of the official datasheet. These compliance attributes are verified per applicable JEDEC and IPC standards and apply to all units shipped under the RS1GAL ordering code.
RS1GAL 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):
- 400 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:
- 1 µA @ 400 V
- Capacitance @ Vr, F:
- 7pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1GAL FAQ
1.How can I place an order for RS1GAL through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1GAL 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 RS1GAL reliable?
The price and inventory of RS1GAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1GAL is usually 5 days.
3.What payment methods are accepted for RS1GAL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1GAL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1GAL?
RS1GAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1GAL 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 RS1GAL?
For technical support, including RS1GAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1GAL requirements.
6.How does Aetrix verify that RS1GAL is sourced from the original manufacturer or authorized distributors?
All RS1GAL 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 RS1GAL meets industry standards.
7.What is the process for return or replacement of RS1GAL?
All RS1GAL units undergo pre-shipment inspection (PSI). If there is an issue with RS1GAL, 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 RS1GAL part is unused and in its original packaging.
Return procedure for RS1GAL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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