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Home > Products > Discrete Semiconductor Products > Thyristors > SCRs

Diodes Incorporated SD1A200A

Name: SD1A200A
Brand: Diodes Incorporated
SKU: SD1A200A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SD1A200A

Manufacturer:: Diodes Incorporated

Category:: SCRs

Package:: -

Datasheet:: SD1A200A.pdf

Description:: THYRISTOR SMA T&R 5K

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

SD1A200A from Littelfuse is a unidirectional SIDAC (Silicon Diode for Alternating Current) thyristor designed for high-voltage, low-current switching in gas igniter circuits. It features a 190–210 Vdc breakover voltage (V_BO), 170 V repetitive peak off-state voltage (V_DRM), 60 mA maximum holding current (I_H), and 1 A RMS on-state current rating at 80°C lead temperature.

For engineers reviewing the SD1A200A datasheet, SD1A200A pinout, SD1A200A application, or SD1A200A equivalent, key selection criteria include verified V_BO tolerance (±10 V), thermal resistance (15 °C/W), di/dt capability (80 A/µs), RoHS-compliant DO-214AC package, and UL Recognition File #E219635 compliance.

Technical Context

The SD1A200A operates as a two-terminal, voltage-triggered switch with no gate control - conduction initiates when applied voltage exceeds its temperature-dependent V_BO (190–210 V at 25°C, derated to ~170 V at 125°C). It latches on until current falls below I_H (≤60 mA), enabling self-sustaining discharge pulses in capacitive ignition circuits.

Its DO-214AC (SMA) package supports compact PCB layouts and withstands 260°C soldering (10 s, lead length ≥1/16″). Thermal resistance junction-to-case is 15 °C/W, enabling reliable operation up to 125°C junction temperature with appropriate heatsinking or ambient derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BO	190–210 Vdc - precise trigger threshold for repeatable spark generation in gas igniters
V_DRM	170 V - maximum sustained AC/DC blocking voltage before unintended conduction
I_H	≤60 mA - minimum current required to maintain conduction; ensures clean turn-off after spark discharge
di/dt	80 A/µs - robustness against rapid current rise during capacitor discharge ignition events
R_thJC	15 °C/W - enables thermal management via case-mounting; limits junction rise under 1 A RMS load
P_RMS max	1 W at 25°C ambient - power dissipation limit defining safe continuous conduction envelope

Pinout & Package

Package: DO-214AC (SMA), molded plastic case with lead-free plating, RoHS 2011/65/EU compliant, UL Recognized (File #E219635).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	High-side current entry terminal	Connected to HV supply or charged capacitor; voltage must exceed V_BO relative to cathode to trigger
Cathode (K)	Low-side current return terminal	Reference node for V_BO measurement; tied to ground or return path in igniter circuit

Key Features

Feature	Design Value
Controlled V_BO tolerance	±10 V (190–210 V) - ensures consistent spark timing across production units
Low holding current	≤60 mA - guarantees automatic turn-off after capacitor energy depletion
High di/dt immunity	80 A/µs - prevents false triggering during fast-rising ignition transients
Thermal robustness	125°C max T_J, 15 °C/W R_thJC - supports operation in enclosed, thermally constrained igniter housings

Applications

Gas Ignition Systems

Appliance Pilot Light Circuits

Use Scenario: Capacitor-charged high-voltage pulse generation to ignite natural gas or propane in residential/commercial burners.

IC Role / Device Role / Timing Role: Voltage-triggered switch that fires when capacitor voltage crosses V_BO, delivering controlled spark energy.

Use Value: Eliminates need for external trigger circuitry; self-quenching behavior ensures single-pulse operation per charge cycle.

Use Scenario: Reliable pilot flame initiation in furnaces, water heaters, and ovens where intermittent ignition is required.

IC Role / Device Role / Timing Role: Unidirectional switching element activated only above threshold voltage, independent of polarity or control signal.

Use Value: Reduces BOM count by replacing relay + transformer or IC-based oscillator solutions with a single passive-triggered component.

Portable Camping Stoves

Commercial Kitchen Igniters

Use Scenario: Battery-powered piezo-assisted or capacitor-discharge ignition in compact outdoor cooking equipment.

IC Role / Device Role / Timing Role: High-voltage switch triggered directly from stored energy; no gate drive or biasing required.

Use Value: Enables miniaturization and low-power operation - compatible with 3–12 V input charging circuits and SMA footprint constraints.

Use Scenario: High-cycle, industrial-grade ignition in commercial grills, fryers, and steam kettles requiring >10,000 actuations.

IC Role / Device Role / Timing Role: Robust, maintenance-free switching device rated for 120 A non-repetitive surge and 1 A RMS continuous duty.

Use Value: Extended service life due to low on-state voltage (1.1–1.5 V) and stable V_BO over temperature (-40 to +125°C).

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional SIDAC switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STMicroelectronics ST01200	V_BO = 180–200 V; V_DRM = 160 V; I_H ≤ 50 mA	Lower V_BO center point reduces spark energy margin in high-humidity environments	Select when tighter V_BO tolerance (±10 V) is less critical than lower I_H for faster quenching
Vishay S1006L	V_BO = 200–220 V; V_DRM = 180 V; I_H ≤ 75 mA; DO-214AB package	Higher V_BO requires larger charging capacitor; larger package increases board area	Choose for higher blocking margin in noisy line-powered systems where 180 V V_DRM is mandatory

Compared with ST01200 and S1006L, SD1A200A offers optimal balance of V_BO consistency (190–210 V), industry-standard SMA footprint, and UL recognition - making it preferred for certified consumer gas appliance designs where regulatory traceability and thermal reliability are prioritized.

Availability

SD1A200A is available at Aetrix Electronics and suitable for gas igniters, appliance pilot light circuits, portable camping stove ignition, and commercial kitchen igniter systems requiring stable component supply, UL-listed reliability, and RoHS-compliant manufacturing.

Supply support for SD1A200A 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 SD1A200A belongs to Littelfuse's SIDAC family, engineered specifically for contactless, high-voltage ignition in gas-fired appliances - emphasizing precision V_BO, thermal stability, and regulatory compliance over general-purpose switching.

FAQ

What is the maximum repetitive peak off-state voltage (V_DRM) for SD1A200A?

The SD1A200A has a V_DRM rating of 170 V, verified per JEDEC test conditions (T_J = −40 to +125°C, 50–60 Hz sine wave). This defines the highest sustained AC or DC voltage the device can block without triggering - critical for safe operation in 120 VAC mains-coupled igniter circuits.

Does SD1A200A require a gate drive signal?

No. The SD1A200A is a two-terminal, unidirectional SIDAC with no gate terminal. It triggers solely when the anode-to-cathode voltage exceeds its breakover voltage (V_BO = 190–210 V), then remains conducting until current drops below the holding current (I_H ≤ 60 mA).

Is SD1A200A RoHS and UL compliant?

Yes. SD1A200A meets RoHS Directive 2011/65/EU and carries UL Recognition under File #E219635. Its DO-214AC package uses lead-free plating, and all mechanical and electrical specifications align with UL's requirements for end-product safety in gas ignition applications.

How does junction temperature affect V_BO performance?

V_BO decreases linearly with rising junction temperature - Fig.3 shows V_BO(T_J)/V_BO(25°C) ratio dropping to ~0.85 at 125°C. At full-rated T_J, effective V_BO is approximately 170 V, matching the V_DRM rating and ensuring predictable turn-on behavior across the full operating range.

SD1A200A 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:: -

SD1A200A FAQ

1.How can I place an order for SD1A200A through Aetrix?

Please submit a Request for Quotation (RFQ) for SD1A200A 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 SD1A200A reliable?

The price and inventory of SD1A200A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD1A200A is usually 5 days.

3.What payment methods are accepted for SD1A200A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD1A200A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SD1A200A?

SD1A200A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SD1A200A 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 SD1A200A?

For technical support, including SD1A200A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD1A200A requirements.

6.How does Aetrix verify that SD1A200A is sourced from the original manufacturer or authorized distributors?

All SD1A200A 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 SD1A200A meets industry standards.

7.What is the process for return or replacement of SD1A200A?

All SD1A200A units undergo pre-shipment inspection (PSI). If there is an issue with SD1A200A, 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 SD1A200A part is unused and in its original packaging.

Return procedure for SD1A200A:

1.Submit a request within 90 days.

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

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