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Taiwan Semiconductor Corporation S1A
- Part No.:
- S1A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
S1A.pdf
- Description:
- DIODE GEN PURP 50V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,640
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Product details
Overview
S1A from Taiwan Semiconductor is a 1 A, 50 V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 1 A), and 175 °C maximum junction temperature - used in DC-DC converters and snubber circuits.
For engineers reviewing the S1A datasheet, S1A pinout, S1A application, or S1A equivalent, key selection criteria include repetitive peak reverse voltage (50 V), surge current rating (40 A), thermal resistance (27 °C/W junction-to-lead), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.
Technical Context
The S1A is a single-die, standard recovery rectifier with 1500 ns reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A conditions. Its junction capacitance is 12 pF at 1 MHz and 4.0 V reverse bias.
Thermal performance is defined by RθJL = 27 °C/W and RθJA = 75 °C/W, enabling operation from –55 °C to +175 °C ambient and storage temperature range. Polarity is indicated by cathode band on the DO-214AC body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Average Forward Current) | 1 A - continuous DC conduction capability at TA ≤ 75 °C with proper PCB copper area |
| VRRM (Repetitive Peak Reverse Voltage) | 50 V - maximum allowable reverse voltage before breakdown; defines minimum blocking margin in 24–48 V systems |
| VF (Forward Voltage) | ≤1.1 V at 1 A, 25 °C - directly impacts conduction loss and thermal rise in high-duty-cycle rectification |
| IFSM (Peak Forward Surge Current) | 40 A (8.3 ms half-sine) - supports inrush and transient overload without failure |
| trr (Reverse Recovery Time) | 1500 ns - limits switching frequency suitability; appropriate for <100 kHz SMPS topologies |
| CJ (Junction Capacitance) | 12 pF at 1 MHz, 4 V - affects high-frequency noise coupling and EMI filter design |
| RθJL (Junction-to-Lead Thermal Resistance) | 27 °C/W - enables direct thermal path to PCB copper or heatsink via leads; critical for power derating |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, polarity marked by cathode band, UL 94V-0 molding compound, weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to lower-potential side of source (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; connects to output rail or filter capacitor positive; blocks reverse voltage up to 50 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and humidity resistance in industrial environments without conformal coating |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines per J-STD-020 |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and end-of-life recycling |
| Low VF and high TJ max | Reduces conduction loss while allowing operation in compact enclosures with elevated ambient temperatures |
Applications
| DC-DC Converter | Snubber Circuit |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates in forward-biased conduction phase only. Use Value: Low VF minimizes power loss; 50 V VRRM provides sufficient margin over 36 V reflected output transients. | Use Scenario: Clamp voltage spikes across MOSFETs or IGBTs in motor drives and SMPS. IC Role / Device Role / Timing Role: Transient energy absorption during switch turn-off; conducts briefly during voltage overshoot. Use Value: Fast enough recovery (1500 ns) to engage before device avalanche; robust surge rating handles repetitive clamping events. |
| Lighting Application | Switching Mode Inverter |
Use Scenario: Input rectification in LED driver modules powered from 24–48 V DC bus or low-voltage AC input. IC Role / Device Role / Timing Role: Full-wave or half-wave AC/DC front-end rectifier; may be used in bridge configuration. Use Value: DO-214AC footprint allows automated placement; halogen-free construction meets lighting safety standards. | Use Scenario: Output rectification in high-frequency inverters for HVAC blowers or small appliance motors. IC Role / Device Role / Timing Role: Converts high-frequency square-wave AC from H-bridge into unidirectional DC for motor winding. Use Value: 175 °C TJ max supports operation near heat-generating power stages; 40 A IFSM tolerates motor startup surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR105 | Ultrafast recovery (75 ns), higher VF (1.3 V), same DO-214AC package and 1 A/50 V rating | Better suited for >100 kHz switching; higher conduction loss reduces efficiency in low-frequency designs | Select when trr < 100 ns is required; verify thermal impact of higher VF |
| Vishay VS-1N4001-M3/54 | Standard recovery (≈2 µs), lower cost, same 1 A/50 V rating and DO-41 through-hole package | Not surface-mount; requires manual or wave soldering; unsuitable for automated SMT production | Choose only for legacy through-hole designs or cost-sensitive non-automated builds |
Compared with MUR105 and VS-1N4001-M3/54, the S1A delivers optimal balance of cost, manufacturability, and performance for mid-frequency (<100 kHz), SMT-based rectification where 1500 ns trr and 1.1 V VF meet system efficiency and layout constraints.
Availability
S1A is available at Aetrix Electronics and suitable for DC-DC converters, snubber circuits, lighting applications, and switching mode inverters requiring stable component supply, J-STD-020 Level 1 handling, and RoHS-compliant sourcing.
Supply support for S1A 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 S1A belongs to TSC's S1x series of general-purpose surface-mount rectifiers, designed specifically for cost-effective, high-reliability AC/DC and DC/DC power conversion in space-constrained, automated production environments.
FAQ
What is the maximum junction temperature rating for the S1A?
The S1A has a maximum junction temperature (TJ) of +175 °C, allowing reliable operation in high-ambient-temperature environments such as enclosed power supplies or motor drive enclosures. This rating is supported by its 27 °C/W junction-to-lead thermal resistance and glass-passivated die construction. Derating curves in the S1A datasheet define safe operating current versus lead temperature.
Does the S1A have a specified reverse recovery time, and how is it measured?
Yes, the S1A has a typical reverse recovery time (trr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This value reflects its standard recovery behavior and is documented in the Electrical Specifications table of the S1A datasheet. It is not an ultrafast or fast-recovery diode, so designers should limit switching frequencies accordingly.
Is the S1A RoHS and halogen-free compliant?
Yes, the S1A is fully RoHS compliant and halogen-free per IEC 61249-2-21. This compliance is confirmed in the Features section of the official Taiwan Semiconductor S1A datasheet (Version S2102), and applies to all units shipped under standard ordering code S1A. No exemptions or exceptions apply.
What package type does the S1A use, and what are its key mechanical attributes?
The S1A uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads, UL 94V-0 flammability-rated molding compound, and cathode polarity indicated by a visible band. Its weight is approximately 0.060 g, and it meets JESD 201 Class 2 whisker resistance requirements - making it suitable for automated placement and lead-free reflow.
Can the S1A replace the 1N4001 in a new SMT design?
No - the S1A cannot directly replace the through-hole 1N4001 due to different packages (DO-214AC vs. DO-41) and mounting methods. However, the S1A serves the same electrical function (1 A, 50 V rectifier) in SMT layouts. For true drop-in replacement in existing through-hole boards, a DO-41 variant like TSC's S1A-TP would be required, not the standard S1A.
S1A 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):
- 50 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):
- 1.5 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 50 V
- Capacitance @ Vr, F:
- 12pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 175°C
S1A FAQ
1.How can I place an order for S1A through Aetrix?
Please submit a Request for Quotation (RFQ) for S1A 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 S1A reliable?
The price and inventory of S1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1A is usually 5 days.
3.What payment methods are accepted for S1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1A?
S1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1A 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 S1A?
For technical support, including S1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1A requirements.
6.How does Aetrix verify that S1A is sourced from the original manufacturer or authorized distributors?
All S1A 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 S1A meets industry standards.
7.What is the process for return or replacement of S1A?
All S1A units undergo pre-shipment inspection (PSI). If there is an issue with S1A, 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 S1A part is unused and in its original packaging.
Return procedure for S1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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