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Taiwan Semiconductor Corporation S1Q
- Part No.:
- S1Q
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
S1Q.pdf
- Description:
- DIODE GEN PURP 1.2KV 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,677
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Product details
Overview
S1Q from Taiwan Semiconductor is a 1 A, 1200 V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring glass-passivated junction, low reverse leakage (≤1 µA at 25°C), and 30 A surge rating (8.3 ms). It serves as a high-voltage freewheeling or output rectifier in offline SMPS and DC-DC converters.
For engineers reviewing the S1Q datasheet, S1Q pinout, S1Q application, or S1Q equivalent, key selection criteria include repetitive peak reverse voltage (1200 V), forward voltage drop (0.95 V @ 1 A, 25°C), thermal resistance (RθJL = 22 °C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance.
Technical Context
The S1Q is a single-die, standard recovery rectifier optimized for high-voltage switching power supplies. Its glass-passivated junction ensures stable reverse characteristics across temperature (IR ≤ 30 µA at 125°C) and long-term reliability under repetitive surge stress (IFSM = 30 A).
Thermal performance is characterized with PCB mounting on 5 mm × 5 mm copper pads: RθJA = 55 °C/W (still air), RθJC = 25 °C/W, enabling operation up to TJ = 150°C with appropriate board layout and airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - supports primary-side rectification in universal-input offline SMPS without derating |
| IF | 1 A continuous - suitable for low-to-medium power outputs (e.g., ≤15 W flyback) |
| IFSM | 30 A (8.3 ms) - withstands typical AC line surge transients without failure |
| VF | 0.95 V max @ 1 A, 25°C - limits conduction loss and self-heating in compact layouts |
| RθJL | 22 °C/W - enables direct thermal path to PCB copper, critical for thermal management in sealed enclosures |
| CJ | 8 pF @ 4 V - minimizes switching noise and EMI in high-frequency converters (e.g., >100 kHz) |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, J-STD-002 solderable, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (lead 1) | Current entry point during forward conduction | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node) |
| Cathode (lead 2, banded end) | Current exit point during forward conduction | Connected to output capacitor positive rail or load return; defines polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable IR and VF over lifetime; eliminates need for conformal coating in humid environments |
| MSL Level 1 rating | Allows unlimited floor life and reflow without baking-reduces manufacturing overhead |
| UL 94V-0 molding compound | Meets flammability safety requirements for Class II power supplies and industrial equipment |
| Halogen-free per IEC 61249-2-21 | Complies with environmental regulations for export to EU, Japan, and China RoHS markets |
Applications
| Offline Flyback SMPS | Industrial DC-DC Converter |
|---|---|
Use Scenario: Primary-side rectification in universal-input (85–265 VAC) 12 W adapter with 65 kHz switching frequency. IC Role / Device Role / Timing Role: High-voltage output rectifier handling 1200 V reverse stress during MOSFET turn-off. Use Value: Low VF (0.95 V) reduces conduction loss by ~15% vs. legacy 1N4007; DO-214AC enables automated placement and higher power density. | Use Scenario: Freewheeling diode across relay coil or inductive load in 24 V industrial control module. IC Role / Device Role / Timing Role: Clamp inductive kickback energy during switch turn-off; absorbs 30 A surge pulses. Use Value: 30 A IFSM rating prevents catastrophic failure during repeated coil de-energization; MSL 1 simplifies SMT line integration. |
| Solar Microinverter DC Link | LED Driver Secondary Rectification |
Use Scenario: DC bus clamping diode in half-bridge topology operating at 1000 V DC link voltage. IC Role / Device Role / Timing Role: Reverse-biased protection device blocking 1200 V during normal operation; conducts only during fault conditions. Use Value: 1200 V VRRM provides 20% margin above 1000 V bus, ensuring long-term reliability under voltage transients. | Use Scenario: Output rectifier in constant-current LED driver powering 36 V string (12×3 V LEDs) from 48 V input. IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated DC to LED load; operates continuously at 1 A. Use Value: 0.84 V VF @ 1 A, 125°C maintains efficiency >89% at full load and elevated ambient; halogen-free construction meets lighting safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06 | VRRM = 600 V, VF = 0.95 V @ 1 A, RθJA = 65 °C/W | Lower voltage rating limits use to ≤300 VDC systems; less thermal margin | Select only if system VR < 500 V and board space allows larger thermal pad |
| ES1D | VRRM = 200 V, VF = 0.92 V @ 1 A, IFSM = 30 A, DO-214AC | Not rated for >200 V reverse stress-unsuitable for 1200 V applications | Use only in low-voltage secondary-side rectification where VRRM ≤ 200 V is sufficient |
Compared with STTH1R06 and ES1D, the S1Q uniquely supports 1200 V reverse blocking while maintaining low VF and industry-standard DO-214AC footprint-enabling direct replacement in high-voltage flyback and PFC stages where alternatives require redesign or derating.
Availability
S1Q is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial inverters, freewheeling circuits, and LED drivers requiring stable component supply and long-lifecycle support.
Supply support for S1Q 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 power, automotive, and industrial markets since 1979.
The S1Q belongs to TSC's high-voltage rectifier product line, engineered for robustness in harsh electrical environments-specifically targeting cost-sensitive, high-reliability offline power conversion applications.
FAQ
What is the maximum junction temperature rating for the S1Q?
The S1Q has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings table. This allows continuous operation in enclosed power supplies with limited airflow, provided thermal design achieves RθJA ≤ 55 °C/W using a 5 mm × 5 mm Cu pad. Derating begins above 125°C ambient per Fig.1 in the S1Q datasheet.
Does the S1Q support lead-free reflow soldering?
Yes, the S1Q features matte tin-plated leads compliant with J-STD-002 for solderability and qualified for lead-free reflow profiles (peak temperature ≤ 260°C). Its MSL Level 1 rating means no baking is required prior to assembly, simplifying manufacturing for high-volume SMT lines.
Is the S1Q pin-compatible with other DO-214AC rectifiers like the 1N4007?
No-the S1Q uses the DO-214AC (SMA) package, whereas the 1N4007 uses DO-41. Though both are axial-lead compatible in function, their footprints differ: DO-214AC requires 2.3 mm lead spacing and surface-mount pads, while DO-41 needs through-hole holes. The S1Q is physically and electrically incompatible with 1N4007 PCB layouts.
What is the reverse leakage current of the S1Q at elevated temperature?
At TJ = 125°C and rated VR, the S1Q exhibits a maximum reverse leakage current (IR) of 30 µA, per electrical specifications. This low leakage preserves efficiency in high-temperature environments such as enclosed LED drivers or industrial motor controls where ambient exceeds 85°C.
Can the S1Q be used in avalanche mode?
No-the S1Q is not rated or characterized for avalanche energy absorption. It is designed as a standard recovery rectifier for forward conduction and reverse blocking only. For avalanche-rated devices, consider TSC's AV series or dedicated TVS diodes; using the S1Q beyond VRRM risks irreversible junction damage.
S1Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1200 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:
- 1 µA @ 1200 V
- Capacitance @ Vr, F:
- 8pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
S1Q FAQ
1.How can I place an order for S1Q through Aetrix?
Please submit a Request for Quotation (RFQ) for S1Q 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 S1Q reliable?
The price and inventory of S1Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1Q is usually 5 days.
3.What payment methods are accepted for S1Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1Q?
S1Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1Q 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 S1Q?
For technical support, including S1Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1Q requirements.
6.How does Aetrix verify that S1Q is sourced from the original manufacturer or authorized distributors?
All S1Q 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 S1Q meets industry standards.
7.What is the process for return or replacement of S1Q?
All S1Q units undergo pre-shipment inspection (PSI). If there is an issue with S1Q, 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 S1Q part is unused and in its original packaging.
Return procedure for S1Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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