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Taiwan Semiconductor Corporation RS1KAL
- Part No.:
- RS1KAL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
RS1KAL.pdf
- Description:
- DIODE GEN PURP 800V 1A THIN SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,780
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Product details
Overview
RS1KAL from Taiwan Semiconductor is a 1A, 800V fast recovery surface-mount rectifier in Thin SMA package, featuring 500ns reverse recovery time, 1.04V forward voltage at 1A/25°C, and 175°C maximum junction temperature-designed for high-efficiency DC-DC converters and switching inverters.
For engineers reviewing the RS1KAL datasheet, RS1KAL pinout, RS1KAL application, or RS1KAL equivalent, key selection criteria include its 800V VRRM, thermal resistance (RθJL = 19°C/W), cathode-band polarity marking, moisture sensitivity level 1 compliance, and suitability for automated SMT assembly in power conversion stages.
Technical Context
The RS1KAL employs a single-die, glass-passivated PN junction optimized for fast recovery (trr = 500ns) under 0.5A forward / 1.0A reverse test conditions. Its low-profile Thin SMA package meets JEDEC DO-221AC and UL 94V-0 standards, with matte tin-plated leads compliant to J-STD-002 solderability.
Thermal performance is characterized with RθJL = 19°C/W and RθJA = 81°C/W on a 5mm × 5mm Cu pad PCB. Reverse leakage remains ≤1µA at 25°C and ≤33µA at 125°C under rated 800V reverse bias, supporting stable operation in elevated ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse blocking voltage; defines safe operating range in bridge or flyback clamp circuits |
| IF | 1 A - Continuous average forward current; supports compact thermal design in space-constrained SMPS layouts |
| trr | 500 ns - Measured at IF=0.5A, IR=1.0A, Irr=0.25A; enables high-frequency switching up to ~200 kHz with low switching loss |
| VF | 1.04 V @ 1A, 25°C - Forward drop directly impacts conduction loss and thermal load in primary-side rectification |
| RθJL | 19 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB copper, critical for reliability without heatsinks |
| IR | ≤1 µA @ 25°C - Low reverse leakage preserves efficiency in high-impedance bias networks and standby modes |
Pinout & Package
Package: Thin SMA (JEDEC DO-221AC variation), low-profile surface-mount case with cathode band marking; weight ≈0.029g; moisture sensitivity level 1 per J-STD-020.
| 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 point | Marked by visible band; ties to output rail or filter capacitor positive terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances humidity resistance and long-term reliability in unsealed industrial environments |
| Fast recovery (500 ns) | Reduces switching loss and EMI generation in 100–200 kHz SMPS topologies |
| Thin SMA package | Enables high-density layout with 4.4 mm × 2.7 mm footprint and 1.2 mm max height |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow, streamlining automated manufacturing |
Applications
| AC-DC Adapter Power Supply | Isolated DC-DC Converter Secondary |
|---|---|
Use Scenario: 12V/1A output stage in universal-input offline adapter with active clamp flyback topology. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 800V VRRM safely withstands reflected voltage spikes; 500ns trr minimizes reverse recovery loss during synchronous switching transitions. | Use Scenario: 48V-to-12V isolated buck-derived converter in telecom power shelf. IC Role / Device Role / Timing Role: Primary-side freewheeling diode in active-clamp forward circuit. Use Value: 175°C TJMAX and RθJL = 19°C/W support continuous 1A operation at 70°C ambient without derating. |
| Solar Microinverter DC Link | Industrial Motor Drive Snubber |
Use Scenario: DC bus clamping in half-bridge inverter stage of residential solar microinverter. IC Role / Device Role / Timing Role: Fast-recovery clamp diode absorbing inductive kickback during IGBT turn-off. Use Value: 30A IFSM handles surge energy; 800V rating exceeds 600V DC bus with margin for transients. | Use Scenario: RC snubber network across relay contacts or IGBT collector-emitter in 24V PLC output module. IC Role / Device Role / Timing Role: Transient suppression diode limiting voltage overshoot during inductive load switching. Use Value: Low 1.04V VF ensures minimal power dissipation during frequent snubbing events; cathode band enables unambiguous PCB orientation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | Same 1A/800V rating; trr = 400ns (slightly faster); VF = 1.15V @ 1A; TO-277 package (larger footprint) | Requires PCB layout change due to TO-277 outline; higher VF increases conduction loss | Prefer when faster recovery is prioritized over board area and thermal resistance |
| ES1J | Same 1A/600V rating; trr = 35ns (much faster); VF = 1.7V @ 1A; SMA package (same footprint) | Lower VRRM limits use to ≤600V systems; higher VF raises thermal load | Select only if system peak reverse voltage ≤600V and ultra-fast recovery is mandatory |
Compared with STTH1R08 and ES1J, the RS1KAL offers optimal balance of 800V blocking, 500ns recovery, and Thin SMA thermal performance-making it preferred for space-constrained, 800V-rated SMPS where lead-to-board thermal transfer and MSL-1 manufacturability are critical.
Availability
RS1KAL is available at Aetrix Electronics and suitable for AC-DC adapters, isolated DC-DC converters, and industrial motor drive snubbers requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for RS1KAL 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 since 1979.
The RS1KAL belongs to TSC's RS1xAL fast recovery rectifier family, engineered specifically for high-frequency switching power supplies demanding reliable 1A/800V rectification in ultra-thin surface-mount packages.
FAQ
What is the maximum junction temperature rating for RS1KAL?
The RS1KAL has a maximum junction temperature (TJ) rating of +175°C, verified per absolute maximum ratings table. This allows sustained operation in high-ambient environments such as enclosed power supplies or motor drive enclosures. Derating curves confirm usable current capacity down to 0.5A at 125°C ambient when mounted on standard PCB copper. The RS1KAL must not exceed this limit to maintain reliability and parametric stability.
Does RS1KAL have a specified reverse recovery time, and under what test conditions?
Yes, RS1KAL has a typical reverse recovery time (trr) of 500 ns, measured under the condition: IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A, per the Electrical Specifications table. This value is confirmed for both 25°C and 125°C junction temperatures and is critical for estimating switching losses in high-frequency converters. The RS1KAL's trr is slower than RS1JAL (250 ns) but faster than RS1MAL (500 ns same), aligning with its 800V rating tier.
What is the forward voltage drop of RS1KAL at full rated current?
The RS1KAL exhibits a maximum forward voltage (VF) of 1.30 V at IF = 1.0 A and TJ = 25°C, with a typical value of 1.04 V under the same conditions. At elevated temperature (TJ = 125°C), VF drops to 0.90 V (max) due to semiconductor physics. This VF directly determines conduction loss (Pcond = IF × VF) and influences thermal design-critical for the RS1KAL's use in compact power stages.
Is RS1KAL RoHS compliant and halogen-free?
Yes, RS1KAL is RoHS compliant and halogen-free, as explicitly stated in the FEATURES section of the official datasheet. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002. These attributes ensure compliance with environmental directives for consumer, industrial, and automotive electronics-confirming that RS1KAL meets modern regulatory requirements without requiring material declarations beyond standard documentation.
What does the 'K' in RS1KAL signify?
The 'K' in RS1KAL denotes the 800V repetitive peak reverse voltage (VRRM) rating, per the ORDERING INFORMATION table where 'x' maps: D=200V, G=400V, J=600V, K=800V, M=1000V. This coding is consistent across the RS1xAL family and appears in the device marking. Thus, RS1KAL is uniquely identified as the 800V variant-not interchangeable with RS1JAL (600V) or RS1MAL (1000V) without verifying system voltage margins and derating requirements.
RS1KAL 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):
- 800 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):
- 500 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 800 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
RS1KAL FAQ
1.How can I place an order for RS1KAL through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1KAL 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 RS1KAL reliable?
The price and inventory of RS1KAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1KAL is usually 5 days.
3.What payment methods are accepted for RS1KAL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1KAL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1KAL?
RS1KAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1KAL 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 RS1KAL?
For technical support, including RS1KAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1KAL requirements.
6.How does Aetrix verify that RS1KAL is sourced from the original manufacturer or authorized distributors?
All RS1KAL 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 RS1KAL meets industry standards.
7.What is the process for return or replacement of RS1KAL?
All RS1KAL units undergo pre-shipment inspection (PSI). If there is an issue with RS1KAL, 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 RS1KAL part is unused and in its original packaging.
Return procedure for RS1KAL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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