Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Thyristors > SCRs

Diodes Incorporated SD1A210GW1

Name: SD1A210GW1
Brand: Diodes Incorporated
SKU: SD1A210GW1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SD1A210GW1

Manufacturer:: Diodes Incorporated

Category:: SCRs

Package:: -

Datasheet:: SD1A210GW1.pdf

Description:: THYRISTOR DO-15 AMMO 2K

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,000

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SD1A210GW1 from Littelfuse is a SIDAC (Silicon Diode for Alternating Current) high-voltage bidirectional thyristor rated for 1 A RMS on-state current and 220 V peak breakover voltage (V_BO = 201–219 V), designed for controlled pulse generation in ignition circuits. It features ±180 V repetitive blocking voltage (V_DRM/V_RRM), low holding current (I_H ≤ 65 mA), and DO-15 axial package for compact gas igniter layouts.

For engineers reviewing the SD1A210GW1 datasheet, SD1A210GW1 pinout, SD1A210GW1 application, or SD1A210GW1 equivalent, key selection criteria include verified V_BO tolerance (±9 V), di/dt capability (80 A/µs), thermal resistance (R_thJC = 15 °C/W), and compatibility with 50–60 Hz AC line-triggered pulse circuits.

Technical Context

The SD1A210GW1 operates as a two-terminal, bidirectional trigger device without gate control - conduction initiates when applied voltage exceeds V_BO in either polarity, then sustains until current falls below I_H. Its symmetric IV curve enables AC-phase-independent switching in resonant or capacitive discharge circuits.

Designed for unidirectional pulse shaping in high-impedance ignition loads, it exhibits low leakage (<10 µA IDRM), fast turn-on (di/dt ≥ 80 A/µs), and robust surge handling (I_TSM = 16 A, 60 Hz half-cycle). Junction temperature range (−40 to +125 °C) supports operation in enclosed HID lamp housings.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BO	201–219 V - precise breakover window ensures reliable, repeatable ignition timing across temperature and aging.
V_DRM/V_RRM	±180 V - symmetrical blocking capability supports direct AC line connection without polarity-sensitive rectification.
I_t(RMS)	1 A - continuous RMS current rating defines maximum duty-cycle pulse train in gas igniter drivers.
I_H	≤65 mA - low holding current enables clean turn-off after capacitor discharge, minimizing post-ignition power loss.
R_thJC	15 °C/W - thermal resistance allows direct heatsinking via leads in DO-15 package for sustained 80 °C lead temperature operation.
di/dt	80 A/µs - critical rate-of-rise immunity prevents false triggering during fast transient events in noisy industrial environments.

Pinout & Package

DO-15 axial-leaded package with cathode/anode symmetry - no polarity marking required due to bidirectional conduction. Leads are tinned copper-clad steel, rated for 260 °C soldering (10 s, ≥1/16″ from case).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Primary current terminal (bidirectional)	Accepts voltage polarity in either direction; identical electrical function to Cathode under AC operation.
Cathode (K)	Primary current terminal (bidirectional)	Electrically interchangeable with Anode; device conducts identically regardless of terminal assignment in AC circuit.

Key Features

Feature	Design Value
V_BO tight tolerance	±9 V (201–219 V) - reduces need for external voltage trimming in mass-produced igniters.
Low I_H	≤65 mA - ensures automatic current interruption after spark generation, eliminating need for active quenching circuitry.
High di/dt immunity	80 A/µs - suppresses spurious turn-on from EMI or line transients in proximity to transformers or relays.
DO-15 footprint	7.6 mm body length, 5.8 mm diameter - fits standard through-hole spacing in compact appliance PCBs and ceramic igniter modules.

Applications

Gas Ignition Systems

HID Lamp Starters

Use Scenario: High-voltage pulse generation to ionize gas mixture in domestic stove or furnace burners.

IC Role / Device Role / Timing Role: Bidirectional trigger switch that fires when line voltage crosses V_BO, initiating capacitor discharge into ignition coil.

Use Value: Eliminates need for separate timing IC or transformer-based oscillator, reducing BOM count by one active component.

Use Scenario: Starting high-intensity discharge lamps (e.g., metal halide, mercury vapor) requiring >3 kV pulses.

IC Role / Device Role / Timing Role: Voltage-controlled switch enabling resonant LC circuit oscillation only above threshold, synchronizing with AC zero-crossing.

Use Value: Enables consistent cold-start performance across −25 to +60 °C ambient without calibration or feedback loop.

Pulse Generator Modules

Industrial Flame Detection Circuits

Use Scenario: Repetitive high-energy pulse source for piezoelectric or spark-gap test equipment.

IC Role / Device Role / Timing Role: Self-triggering relaxation oscillator element in RC-charged, SIDAC-discharged topology.

Use Value: Provides jitter-free, voltage-defined timing with <±1% V_BO drift over 10,000 cycles.

Use Scenario: Monitoring flame presence via AC-coupled ionization current detection in burner safety systems.

IC Role / Device Role / Timing Role: Threshold detector that triggers diagnostic pulse when flame rectification fails and AC voltage rises above V_BO.

Use Value: Adds fail-safe shutdown capability without adding microcontroller or comparator circuitry.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SIDAC-based ignition applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL1A210GW	V_BO = 200–220 V; R_thJC = 18 °C/W; I_TSM = 12 A	Lower surge rating limits use in high-reliability furnace igniters with frequent cycling.	Select when cost sensitivity outweighs surge margin; verify thermal derating at 80 °C ambient.
ON Semiconductor 2N6565	V_BO = 200–225 V; I_H = 35–100 mA; DO-41 package (longer leads)	Wider I_H spread increases risk of unintended turn-off in low-current flame-sensing paths.	Prefer for legacy DO-41 board compatibility; confirm layout clearance for 9.5 mm body length.

Compared with STL1A210GW and 2N6565, SD1A210GW1 offers superior thermal performance (15 vs. 18 °C/W), tighter V_BO control (±9 V vs. ±10–12.5 V), and higher surge rating (16 A), making it optimal for thermally constrained, high-cycle-count gas ignition designs.

Availability

SD1A210GW1 is available at Aetrix Electronics and suitable for gas igniters, HID lamp starters, pulse generator modules, and industrial flame detection circuits requiring stable component supply across automotive aftermarket, HVAC OEM, and lighting manufacturing programs.

Supply support for SD1A210GW1 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 SD1A210GW1 belongs to Littelfuse's SIDAC family, engineered specifically for high-reliability, maintenance-free AC-triggered ignition in residential and commercial combustion systems.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The SD1A210GW1 has an operating junction temperature range of −40 °C to +125 °C. For continuous RMS current (1 A), thermal design must ensure junction temperature stays within this limit - using R_thJC = 15 °C/W and typical PCB copper area, maximum case temperature should not exceed 95 °C at 80 °C ambient.

Can SD1A210GW1 replace a DIAC in standard relaxation oscillator circuits?

Yes - the SD1A210GW1 functions identically to a DIAC in bidirectional trigger applications, with tighter V_BO tolerance (±9 V vs. typical ±15 V for DIACs) and higher surge rating. No circuit modification is needed, but verify that load current remains above 25 mA to guarantee reliable holding.

Is the DO-15 package RoHS-compliant and lead-free?

Yes - the SD1A210GW1 meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. The device carries the "Pb-Free" marking per Littelfuse specification KDXD02 Rev. 2, and soldering profile complies with JEDEC J-STD-020 for MSL Level 1.

Does SD1A210GW1 require a series current-limiting resistor in ignition applications?

Yes - a series resistor is mandatory to limit peak current during conduction and prevent latch-up or thermal runaway. Typical value is 10–47 Ω (1 W) when driving a 1–2 nF capacitor charged to 220 V, ensuring I_t(RMS) stays within 1 A and peak pulse current remains below 17.5 A.

SD1A210GW1 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:: -

SD1A210GW1 FAQ

1.How can I place an order for SD1A210GW1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SD1A210GW1 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 SD1A210GW1 reliable?

The price and inventory of SD1A210GW1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD1A210GW1 is usually 5 days.

3.What payment methods are accepted for SD1A210GW1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD1A210GW1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SD1A210GW1?

SD1A210GW1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SD1A210GW1 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 SD1A210GW1?

For technical support, including SD1A210GW1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD1A210GW1 requirements.

6.How does Aetrix verify that SD1A210GW1 is sourced from the original manufacturer or authorized distributors?

All SD1A210GW1 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 SD1A210GW1 meets industry standards.

7.What is the process for return or replacement of SD1A210GW1?

All SD1A210GW1 units undergo pre-shipment inspection (PSI). If there is an issue with SD1A210GW1, 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 SD1A210GW1 part is unused and in its original packaging.

Return procedure for SD1A210GW1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

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…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

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…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

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…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

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.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

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.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

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…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

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…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

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…