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Taiwan Semiconductor Corporation S1KF-T
- Part No.:
- S1KF-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
S1KF-T.pdf
- Description:
- 1A, 800V, STANDARD RECOVERY RECT
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
S1KF-T from Taiwan Semiconductor is a 1A, 800V standard surface-mount silicon rectifier diode in SMAF package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 30A surge capability (8.3 ms). It serves as the primary AC-to-DC conversion element in compact switching power supplies.
For engineers reviewing the S1KF-T datasheet, S1KF-T pinout, S1KF-T application, or S1KF-T equivalent, key selection criteria include its 800V repetitive peak reverse voltage, 0.94V forward voltage at 1.0A/25°C, thermal resistance (RθJL = 15°C/W), and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
The S1KF-T implements a single-die, planar passivated junction structure optimized for high-voltage rectification in space-constrained surface-mount applications. Its 800V VRRM rating and 150°C maximum junction temperature support operation in thermally demanding DC-DC converters and inverters.
Thermal performance is characterized with RθJA = 89°C/W on a 5mm × 5mm copper pad PCB, enabling reliable 1A continuous conduction without forced cooling. Reverse recovery behavior is not specified, confirming its classification as a standard (non-fast-recovery) rectifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse voltage before breakdown; defines safe operating limit in 600–800 V DC bus applications |
| IF | 1 A - Continuous forward current rating; supports up to 12 W dissipation at 1.1 V drop under worst-case thermal conditions |
| IFSM (8.3 ms) | 30 A - Non-repetitive surge current capacity; withstands inrush in SMPS startup and line transients |
| VF @ 1A/25°C | 0.94 V (max) - Forward voltage drop determines conduction loss; contributes ~0.94 W dissipation at full load |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB copper, critical for thermal reliability |
| IR @ 800V/25°C | 5 µA (max) - Low reverse leakage preserves efficiency in high-impedance hold-up circuits and standby modes |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat) - Compact 2-pin molded package with matte tin-plated leads, UL 94V-0 rated compound, and cathode band polarity marking. Weight: 0.035 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC input or transformer secondary; must handle 30A surge without bond wire failure |
| Cathode | Forward current exit / reverse voltage reference | Marked by visible band; ties to output capacitor negative or ground return path; carries full load current |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable 800V blocking performance and long-term reliability under humidity and bias stress |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; compatible with standard SMT assembly lines without special handling |
| J-STD-002 solderable leads | Guarantees robust wetting and intermetallic formation during lead-free reflow (260°C peak) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant industrial deployments |
Applications
| AC-DC Power Adapters | Industrial DC-DC Converters |
|---|---|
Use Scenario: 12 V/1 A isolated flyback adapter for IoT gateways and smart sensors. IC Role / Device Role / Timing Role: Primary-side output rectifier converting transformer secondary AC to regulated DC bus. Use Value: 0.94 V forward drop minimizes conduction loss at light loads; 800V rating accommodates reflected voltage spikes in 230 VAC input designs. | Use Scenario: 24 V/1 A auxiliary supply in PLC backplane modules. IC Role / Device Role / Timing Role: Input rectifier stage feeding bulk capacitor in non-isolated buck-derived topology. Use Value: 150°C max junction temperature ensures stability across -40°C to +70°C ambient; 30A surge handles motor drive transient coupling. |
| Switching Inverters | General-Purpose Rectification |
Use Scenario: DC link protection rectifier in 48 V solar micro-inverter front-end. IC Role / Device Role / Timing Role: Freewheeling path for inductive energy during MOSFET commutation cycles. Use Value: 5 µA reverse leakage prevents capacitor self-discharge during off-state; SMAF footprint saves board area vs. DO-214AC. | Use Scenario: Signal-level AC detection and polarity correction in sensor interface boards. IC Role / Device Role / Timing Role: Half-wave rectifier conditioning low-current AC signals from current transformers or piezoelectric elements. Use Value: 7 pF junction capacitance avoids signal distortion at kHz-range frequencies; cathode band enables unambiguous orientation in automated placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | Same 1A/800V rating but TO-277 package; higher RθJA (110°C/W); fast-recovery (trr = 75 ns) | Better suited for high-frequency PFC stages where reverse recovery matters | Select STTH1R08 only if trr < 100 ns is required; S1KF-T preferred for cost-sensitive, thermally constrained layouts |
| ES1J | SMA package (not SMAF); identical VRRM/IF; slightly higher VF (1.7 V typ); same moisture sensitivity level | Compatible with legacy SMA footprints but requires pad layout revision | Choose ES1J only when existing board design uses SMA; S1KF-T offers lower profile and improved thermal path via SMAF lead geometry |
Compared with STTH1R08 and ES1J, the S1KF-T delivers superior thermal performance (RθJL = 15°C/W) in ultra-thin power supplies, avoids fast-recovery complexity where unnecessary, and maintains strict halogen-free compliance without trade-offs in surge robustness.
Availability
S1KF-T is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, and switching inverters requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for S1KF-T 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 industrial, computing, and consumer markets since 1979.
The S1KF-T belongs to TSC's S1x-F series of standard rectifiers, engineered specifically for cost-effective, high-yield surface-mount power conversion in space- and thermal-constrained applications.
FAQ
What is the maximum junction temperature rating for the S1KF-T?
The S1KF-T has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings table. This allows continuous operation in environments up to +70°C ambient when mounted on a 5 mm × 5 mm Cu pad, leveraging its RθJA = 89°C/W. Derating begins above 25°C ambient, per Figure 1 in the datasheet. The S1KF-T must not exceed this limit to ensure long-term reliability and avoid parametric shift.
Does the S1KF-T have a specified reverse recovery time (trr)?
No, the S1KF-T does not specify reverse recovery time (trr) in its datasheet, confirming its classification as a standard (non-fast-recovery) rectifier. It is intended for line-frequency and low-to-moderate switching frequency applications (<100 kHz). For high-frequency PFC or synchronous rectification, a fast-recovery alternative like STTH1R08 should be evaluated instead of the S1KF-T.
What is the forward voltage drop of the S1KF-T at 1.0 A and 125°C?
The S1KF-T exhibits a forward voltage (VF) of 0.83 V (typical) and ≤0.93 V (maximum) at IF = 1.0 A and TJ = 125°C. This reduced VF versus room temperature reflects positive temperature coefficient behavior typical of silicon PN junctions. Designers should use the 0.93 V max value for worst-case power loss calculations in high-ambient thermal environments.
Is the S1KF-T compatible with lead-free reflow soldering processes?
Yes, the S1KF-T features matte tin-plated leads qualified per J-STD-002 for solderability, supporting standard lead-free reflow profiles with peak temperatures up to 260°C. Its moisture sensitivity level (MSL) is Level 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly-no preconditioning is required before using the S1KF-T in automated SMT lines.
How does the SMAF package of the S1KF-T differ from standard SMA?
The SMAF package used by the S1KF-T is a flat-profile variant of SMA with shorter lead length and optimized lead geometry for lower RθJL (15°C/W vs. ~25°C/W for standard SMA). It retains identical footprint dimensions but improves thermal transfer to the PCB. Unlike SMA, SMAF is not interchangeable without verifying land pattern compatibility-always refer to TSC's Package Outline Dimensions drawing for the S1KF-T before layout.
S1KF-T 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:
- 1.1 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 7pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
S1KF-T FAQ
1.How can I place an order for S1KF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for S1KF-T 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 S1KF-T reliable?
The price and inventory of S1KF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KF-T is usually 5 days.
3.What payment methods are accepted for S1KF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1KF-T?
S1KF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1KF-T 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 S1KF-T?
For technical support, including S1KF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KF-T requirements.
6.How does Aetrix verify that S1KF-T is sourced from the original manufacturer or authorized distributors?
All S1KF-T 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 S1KF-T meets industry standards.
7.What is the process for return or replacement of S1KF-T?
All S1KF-T units undergo pre-shipment inspection (PSI). If there is an issue with S1KF-T, 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 S1KF-T part is unused and in its original packaging.
Return procedure for S1KF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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