My Inquiry
My Account
Diodes Incorporated SD1A220G
- Part No.:
- SD1A220G
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- -
- Datasheet:
-
SD1A220G.pdf
- Description:
- THYRISTOR DO-15 T&R 4K
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SD1A220G from Littelfuse (LSC) is a unidirectional SIDAC thyristor designed for controlled high-voltage AC ignition triggering in gas igniters. It features a 220 V nominal breakover voltage (VBO), 190 V peak repetitive off-state voltage (VDRM), 1 A RMS on-state current rating, and 60 mA maximum holding current (IH), operating across –40°C to +125°C junction temperature.
For engineers reviewing the SD1A220G datasheet, SD1A220G pinout, SD1A220G application, or SD1A220G equivalent, key selection criteria include precise VBO tolerance (210–230 V), low IH for reliable turn-off after spark generation, di/dt capability of 220 A/μs, and DO-15 package compatibility with high-voltage creepage requirements in appliance ignition circuits.
Technical Context
The SD1A220G operates as a two-terminal, voltage-triggered switching device without gate control - conduction initiates when applied voltage exceeds its temperature-dependent breakover threshold (VBO = 220 V ±10 V at 25°C). Its unidirectional structure supports half-wave AC triggering only.
It exhibits a typical on-state voltage of 1.1–1.5 V at 1 A, thermal resistance of 15°C/W (junction-to-case), and maintains stable VBO drift (±15% over –40°C to +125°C), enabling predictable spark timing in varying ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBO | 220 V nominal; 210–230 V range ensures consistent spark initiation voltage across production units |
| VDRM | 190 V; defines maximum repetitive blocking voltage before unintended conduction in AC half-cycles |
| IH | ≤60 mA; guarantees clean turn-off after spark discharge, preventing latch-up in low-power igniter circuits |
| IT(RMS) | 1 A at TL = 80°C; supports sustained current delivery during spark formation without thermal runaway |
| di/dt | 220 A/μs minimum; withstands rapid current rise during plasma channel formation without false triggering |
| RthJC | 15°C/W; enables effective heat transfer to heatsink or PCB copper in compact DO-15 mounting |
Pinout & Package
Package: JEDEC DO-15 molded plastic case with lead-free plating, RoHS-compliant (2011/65/EU), UL Recognized (E219635). Dimensions: A = 25.4 mm max, B = 0.71–0.86 mm, C = 2.60–3.60 mm, D = 5.80–7.60 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | High-side current entry terminal | Connected to AC line or transformer secondary; must withstand full VDRM and transient surges |
| Cathode (K) | Low-side current exit terminal | Referenced to ground or neutral; carries full load current during conduction phase |
Key Features
| Feature | Design Value |
|---|---|
| VBO tight tolerance | 210–230 V range ensures ±5% deviation from nominal 220 V, critical for repeatable spark timing |
| Low holding current | ≤60 mA allows reliable self-commutation after spark energy dissipation, eliminating need for external snubbers |
| High di/dt immunity | 220 A/μs rating prevents spurious turn-on during fast-rising ignition transients |
| DO-15 mechanical robustness | UL-recognized, RoHS-compliant package supports automated insertion and reflow-compatible lead-free assembly |
Applications
| Gas Range Ignition | Commercial Oven Igniter |
|---|---|
Use Scenario: Repeated spark generation across ceramic electrode gap in residential gas stovetop burners. IC Role / Device Role / Timing Role: Voltage-triggered switch that fires when line voltage crosses VBO, initiating spark without external timing circuitry. Use Value: Eliminates need for separate oscillator or microcontroller-based ignition control, reducing BOM cost and failure points. | Use Scenario: High-reliability spark initiation in sealed commercial convection oven burner assemblies. IC Role / Device Role / Timing Role: Unidirectional AC switch providing isolated, self-timed spark pulses synchronized to AC zero-crossing intervals. Use Value: Maintains consistent spark energy across wide ambient temperature range (–40°C to +125°C junction), ensuring cold-start reliability. |
| Water Heater Pilot Ignition | Gas Dryer Ignition Module |
Use Scenario: Intermittent pilot flame activation in tank-type residential water heaters using 120 VAC mains. IC Role / Device Role / Timing Role: Breakover-triggered switch delivering single high-current pulse per half-cycle above VBO threshold. Use Value: Withstands repeated thermal cycling and humidity exposure due to DO-15 hermetic molding and RoHS-compliant terminations. | Use Scenario: Compact spark generation in space-constrained gas dryer ignition modules mounted near combustion chamber. IC Role / Device Role / Timing Role: Two-terminal trigger device replacing bulkier transformer-based igniters while maintaining EMI compliance. Use Value: 15°C/W thermal resistance enables direct PCB copper pour heatsinking, avoiding discrete heatsinks in tight enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional SIDAC ignition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SD1A220 | VBO identical (220 V), but non-RoHS compliant and lacks UL recognition | Not suitable for new designs requiring RoHS or safety certification | Select SD1A220G where regulatory compliance and traceable sourcing are mandatory |
| K2200S | VBO = 220 V, but IH = 100 mA (higher), di/dt = 100 A/μs (lower) | May fail to commutate reliably in low-energy igniter circuits with long spark gaps | Prefer SD1A220G where low IH and high di/dt ensure robust operation under marginal line voltage |
Compared with SD1A220 and K2200S, SD1A220G delivers certified RoHS/UL compliance, tighter VBO consistency, lower IH for cleaner turn-off, and higher di/dt immunity - making it the preferred choice for new appliance ignition designs requiring regulatory alignment and field reliability.
Availability
SD1A220G is available at Aetrix Electronics and suitable for gas range ignition, commercial oven igniters, water heater pilot systems, and gas dryer ignition modules requiring stable component supply and long-term lifecycle support.
Supply support for SD1A220G 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 (LSC) is a global leader in circuit protection, power control, and sensing technologies, founded in 1927 and headquartered in Chicago, Illinois.
The SD1A220G belongs to Littelfuse's SIDAC family, engineered specifically for high-voltage, low-power AC-triggered ignition in household and commercial gas appliances - prioritizing voltage precision, thermal stability, and regulatory compliance.
FAQ
What is the function of SD1A220G in an ignition circuit?
The SD1A220G acts as a voltage-triggered bidirectional switch that conducts when AC voltage across its terminals exceeds its 220 V breakover threshold, delivering a high-current pulse to generate a spark across an igniter electrode gap. It requires no gate drive or external timing components, simplifying circuit design.
Can SD1A220G be used in DC circuits?
No - SD1A220G is a unidirectional SIDAC optimized for half-wave AC triggering. In DC applications, it will latch on once triggered and remain conducting until current falls below its 60 mA holding threshold, which is not controllable without external current interruption.
What is the significance of the DO-15 package for SD1A220G?
The DO-15 package provides standardized mechanical dimensions, UL recognition (E219635), RoHS compliance, and sufficient creepage/clearance for 250 VAC-rated ignition circuits. Its axial leads support wave soldering and manual replacement, and its thermal resistance (15°C/W) enables direct PCB copper heatsinking.
How does temperature affect SD1A220G's breakover voltage?
VBO decreases linearly with increasing junction temperature: typical drift is –0.1%/°C, resulting in ~15% reduction from 220 V at 25°C to ~187 V at 125°C. This is characterized in Fig.3 of the datasheet and must be accounted for in worst-case spark timing analysis.
SD1A220G 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:
- -
SD1A220G FAQ
1.How can I place an order for SD1A220G through Aetrix?
Please submit a Request for Quotation (RFQ) for SD1A220G 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 SD1A220G reliable?
The price and inventory of SD1A220G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD1A220G is usually 5 days.
3.What payment methods are accepted for SD1A220G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD1A220G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD1A220G?
SD1A220G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD1A220G 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 SD1A220G?
For technical support, including SD1A220G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD1A220G requirements.
6.How does Aetrix verify that SD1A220G is sourced from the original manufacturer or authorized distributors?
All SD1A220G 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 SD1A220G meets industry standards.
7.What is the process for return or replacement of SD1A220G?
All SD1A220G units undergo pre-shipment inspection (PSI). If there is an issue with SD1A220G, 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 SD1A220G part is unused and in its original packaging.
Return procedure for SD1A220G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD1A220G Tags
-
MCR12DSNT4G
Littelfuse Inc.
-
2N6404G
Littelfuse Inc.
-
S4015LTP
Littelfuse Inc.
-
VS-25TTS12HM3
Vishay General Semiconductor - Diodes Division
-
S4020LTP
Littelfuse Inc.
-
MCR12MG
Littelfuse Inc.
-
MCR69-3G
Littelfuse Inc.
-
S8025LTP
Littelfuse Inc.
-
CMA30E1600PN
IXYS
-
S8016RATP
Littelfuse Inc.
-
TXN625RG
STMicroelectronics
.jpg)
-
SK055RTP
Littelfuse Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
