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Diodes Incorporated SD1A180A
- Part No.:
- SD1A180A
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- -
- Datasheet:
-
SD1A180A.pdf
- Description:
- THYRISTOR SMA T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SD1A180A from Littelfuse is a unidirectional SIDAC (Silicon Diode for Alternating Current) thyristor designed for high-voltage AC switching and triggering in gas igniter circuits. It features a 180 V nominal breakover voltage (VBO), 150 V repetitive peak off-state voltage (VDRM), 1 A RMS on-state current rating, 60 mA maximum holding current (IH), and DO-214AC (SMA) surface-mount package.
For engineers reviewing the SD1A180A datasheet, SD1A180A pinout, SD1A180A application, or SD1A180A equivalent, key selection criteria include verified VBO tolerance (170–190 V), di/dt capability (≥80 A/μs), thermal resistance (RthJC = 15 °C/W), RoHS compliance, and UL recognition (E219635).
Technical Context
The SD1A180A operates as a two-terminal, voltage-triggered bilateral switch that conducts only after its breakover voltage is exceeded under forward bias. It exhibits no gate control and latches on until current falls below IH - making it ideal for self-triggering AC pulse generation without external timing circuitry.
Its 80 A/μs critical rate of rise of on-state current ensures reliable turn-on under fast-rising AC waveforms, while the 15 °C/W junction-to-case thermal resistance supports sustained 1 A RMS conduction at TL = 80°C with appropriate PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBO | 170–190 V - defines precise AC voltage threshold for self-triggering in gas igniter spark generation |
| VDRM | 150 V - maximum repetitive off-state blocking voltage; sets safe operating margin below VBO |
| IH | ≤60 mA - minimum current to maintain conduction; determines minimum load current for reliable hold-on |
| IT(RMS) | 1 A - continuous RMS current handling capacity at 80°C lead temperature |
| di/dt | ≥80 A/μs - ensures robust turn-on without false triggering during rapid voltage transients |
| RthJC | 15 °C/W - enables thermal design with standard SMA footprint and 1 oz copper pad |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case with lead-free plating per RoHS 2011/65/EU; UL Recognized (File # E219635).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward-biased terminal during breakover | Current entry point when VAO ≥ VBO; connects to high-side AC line in igniter transformer primary |
| Cathode (K) | Return path during conduction | Current exit point; ties to ground or low-side AC return; polarity-sensitive for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Breakover voltage tolerance | ±10 V around 180 V - enables consistent spark initiation across production lots and temperature range |
| Compact DO-214AC package | Reduces PCB real estate by >40% vs. axial DO-41 - critical for space-constrained igniter modules |
| UL Recognition | E219635 - satisfies end-equipment safety certification requirements without additional component-level testing |
| RoHS compliance | Lead-free plating and halogen-free molding compound - meets global environmental compliance mandates |
Applications
| Gas Ignition Systems | AC-Powered Spark Generators |
|---|---|
Use Scenario: High-reliability spark generation in residential/commercial gas stoves and ovens. IC Role / Device Role / Timing Role: Unidirectional voltage-triggered switch that initiates spark pulse when AC line voltage crosses VBO threshold. Use Value: Eliminates need for separate timing capacitor or trigger transformer; reduces BOM count by one active component. | Use Scenario: Compact spark generation in portable camping stoves and propane heaters. IC Role / Device Role / Timing Role: Self-triggering AC switch placed in series with ignition transformer primary winding. Use Value: Enables direct mains-connected design with no auxiliary DC supply or isolation driver required. |
| Flame Detection Circuits | Industrial Burner Control |
Use Scenario: Flame rectification sensing in combination with spark generation in dual-function burners. IC Role / Device Role / Timing Role: Conducts during spark phase, then blocks during flame-sense half-cycle due to unidirectional behavior. Use Value: Supports dual-mode operation using single device - reduces component count and interconnect complexity. | Use Scenario: Reliable ignition sequencing in commercial boiler and furnace control panels. IC Role / Device Role / Timing Role: High-voltage AC switch triggered synchronously with zero-cross detection for repeatable spark timing. Use Value: Maintains stable VBO over -40°C to +125°C junction range, ensuring cold-start reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional SIDAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SD1A180B | VBO range 175–195 V - tighter upper bound, wider overall spread | Same gas igniter use; slightly higher average breakover may delay spark timing at low line voltage | Select when tighter statistical VBO clustering is needed for batch consistency |
| K2200E | VBO = 220 V, IT(RMS) = 0.8 A, DO-214AB (SMB) package | Higher voltage rating suits 230 VAC systems; lower current rating limits duty cycle in high-energy igniters | Choose for 230 VAC mains regions where 180 V VBO is insufficient for reliable triggering |
Compared with SD1A180B and K2200E, the SD1A180A offers optimal balance of 180 V nominal VBO, 1 A RMS rating, and SMA footprint - making it the preferred choice for 120 VAC gas igniters requiring compact size and UL-recognized reliability.
Availability
SD1A180A is available at Aetrix Electronics and suitable for gas igniters, AC spark generators, flame detection circuits, and industrial burner control systems requiring stable component supply and UL-recognized safety compliance.
Supply support for SD1A180A 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
Littelfuse is a global manufacturer of circuit protection, power control, and sensing technologies, founded in 1927 and headquartered in Chicago, Illinois.
The SD1A180A belongs to Littelfuse's SIDAC family, engineered specifically for robust, maintenance-free AC-triggered ignition in consumer and commercial gas appliances.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The SD1A180A has an operating junction temperature range of –40°C to +125°C. For continuous 1 A RMS conduction, thermal design must ensure TJ does not exceed +125°C - achievable with 15 °C/W RthJC and adequate PCB copper area at TL = 80°C.
Can SD1A180A be used in bidirectional AC circuits?
No - the SD1A180A is a unidirectional SIDAC and conducts only during positive half-cycles when anode voltage exceeds cathode by ≥VBO. For full-wave triggering, two devices in inverse parallel or a bidirectional TRIAC-based solution is required.
Is SD1A180A compatible with lead-free reflow soldering?
Yes - the device uses lead-free terminal plating and is rated for maximum lead solder temperature of 260°C for 10 seconds. It is qualified for standard Pb-free reflow profiles including JEDEC J-STD-020, with peak temperature ≤260°C and time above liquidus ≤60 seconds.
How does junction temperature affect breakover voltage?
VBO decreases linearly with rising junction temperature - Fig.3 shows VBO(TJ)/VBO(25°C) ratio dropping to ~0.9 at +125°C. At 125°C, VBO is approximately 162 V (90% of 180 V), which remains within functional range for 120 VAC systems with crest factor ≥1.4.
SD1A180A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Off State:
- -
- Voltage - Gate Trigger (Vgt) (Max):
- -
- Current - Gate Trigger (Igt) (Max):
- -
- Voltage - On State (Vtm) (Max):
- -
- Current - On State (It (AV)) (Max):
- -
- Current - On State (It (RMS)) (Max):
- -
- Current - Hold (Ih) (Max):
- -
- Current - Off State (Max):
- -
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- -
- SCR Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SD1A180A FAQ
1.How can I place an order for SD1A180A through Aetrix?
Please submit a Request for Quotation (RFQ) for SD1A180A 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 SD1A180A reliable?
The price and inventory of SD1A180A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD1A180A is usually 5 days.
3.What payment methods are accepted for SD1A180A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD1A180A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD1A180A?
SD1A180A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD1A180A 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 SD1A180A?
For technical support, including SD1A180A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD1A180A requirements.
6.How does Aetrix verify that SD1A180A is sourced from the original manufacturer or authorized distributors?
All SD1A180A 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 SD1A180A meets industry standards.
7.What is the process for return or replacement of SD1A180A?
All SD1A180A units undergo pre-shipment inspection (PSI). If there is an issue with SD1A180A, 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 SD1A180A part is unused and in its original packaging.
Return procedure for SD1A180A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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