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Diodes Incorporated SD09A240E
- Part No.:
- SD09A240E
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- -
- Datasheet:
-
SD09A240E.pdf
- Description:
- THYRISTOR DO-41 T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SD09A240E from Lite-On is a silicon bidirectional thyristor (SIDAC) rated for 240 V peak repetitive off-state voltage, 0.9 A RMS on-state current, and 120 A/μs critical rate of rise of on-state current, designed to trigger SCRs and triacs in high-voltage pulse applications such as HID lamp ignitors and strobe flashers.
For engineers reviewing the SD09A240E datasheet, SD09A240E pinout, SD09A240E application, or SD09A240E equivalent, key selection criteria include breakover voltage tolerance (220–250 V), dynamic holding current limit (≤100 mA), di/dt capability (≥120 A/μs), and DO-41 package thermal resistance (40 °C/W).
Technical Context
The SD09A240E operates as a three-layer, two-terminal negative-resistance switching device with symmetrical forward/reverse conduction. It triggers when applied voltage exceeds its breakover threshold (220–250 V) under specified IBO = 35 µA, then latches until current falls below dynamic holding level (≤100 mA).
Its glass-passivated junction ensures stable operation at junction temperatures from –40 °C to +125 °C, and its DO-41 package supports lead-free soldering at 260 °C for 10 s. Thermal resistance from junction to lead is 40 °C/W at 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM/VRRM | ±240 V - Maximum repetitive blocking voltage in either direction before conduction |
| IT(RMS) | ±0.9 A - Continuous RMS current handling capacity under full-conduction-angle conditions |
| VBO | 220–250 V - Voltage at which device switches from off-state to on-state at IBO = 35 µA |
| IH | ≤100 mA - Minimum current required to maintain conduction after triggering |
| di/dt | ≥120 A/μs - Minimum rate of current rise the device can sustain without false triggering |
| RthJL | 40 °C/W - Thermal resistance from junction to lead, defining power dissipation limits at given lead length |
| VTM | ≤1.5 V - Peak on-state voltage drop at 1 A pulse, directly impacting conduction loss |
Pinout & Package
Package: DO-41 molded plastic case with matte tin–plated leads, RoHS-compliant, weight 0.34 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Two-terminal main current path | No polarity distinction; conducts equally in both directions upon breakover |
| Case | Non-electrical mechanical reference | DO-41 body provides mechanical mounting and thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| High di/dt capability | 120 A/μs enables reliable triggering in fast-rising pulse circuits without spurious turn-on |
| Glass passivation | Ensures long-term stability of breakover voltage and leakage current over temperature and life |
| UL Recognition | File # E219635 confirms compliance for use in safety-critical lighting and ignition systems |
| Lead-free plating | Matte tin finish meets RoHS 2002/95/EC and supports Pb-free reflow processes |
Applications
| High-Pressure Sodium (HPS) Lamp Ignitor | Strobe Light Pulse Generator |
|---|---|
Use Scenario: Initiates high-voltage pulse to ionize gas in HPS lamps during cold start. IC Role / Device Role / Timing Role: Bidirectional switch that breaks over at ~230 V to discharge capacitor into transformer primary. Use Value: Precise 220–250 V VBO range ensures consistent ignition timing across temperature and aging. | Use Scenario: Generates short-duration, high-current pulses for xenon flash tube triggering. IC Role / Device Role / Timing Role: Fast-switching SIDAC delivering controlled energy bursts with minimal jitter. Use Value: 120 A/μs di/dt rating prevents false triggering during rapid capacitor discharge transients. |
| SCR Gate Trigger Circuit | High-Voltage Regulator Snubber |
Use Scenario: Provides isolated, voltage-threshold–based gate drive for phase-controlled rectifiers. IC Role / Device Role / Timing Role: Self-triggering switch replacing optocoupler + Zener networks in AC line-synchronized control. Use Value: Symmetrical ±240 V blocking allows direct AC line interface without polarity conditioning. | Use Scenario: Clamps transient overvoltage spikes across regulator pass devices during switching transitions. IC Role / Device Role / Timing Role: Voltage-triggered crowbar element that activates only above safe operating threshold. Use Value: ≤5 µA IDRM ensures negligible standby leakage, preserving regulation accuracy in low-power modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional thyristor switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NTE6422 | VBO = 220–240 V; IT(RMS) = 0.8 A; di/dt = 100 A/μs | Lower RMS current and di/dt margin; suitable for lower-energy ignitors | Select when cost sensitivity outweighs need for 0.9 A rating and 120 A/μs robustness |
| ST220S02 | VBO = 220 V (min); IT(RMS) = 1.0 A; TO-92 package; RthJL = 60 °C/W | Higher current but higher thermal resistance; requires larger copper area for same power | Prefer for space-constrained boards where TO-92 fits better than DO-41, accepting thermal derating |
Compared with NTE6422 and ST220S02, SD09A240E offers the highest di/dt immunity (120 A/μs) and optimal thermal resistance (40 °C/W) in DO-41, making it best suited for high-reliability, high-pulse-energy ignitor designs where transient robustness and thermal efficiency are prioritized.
Availability
SD09A240E is available at Aetrix Electronics and suitable for high-pressure sodium vapor lighting, strobe flashers, SCR gate trigger circuits, and high-voltage pulse generators requiring stable component supply across industrial production cycles.
Supply support for SD09A240E 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
Lite-On Technology Corporation is a Taiwan-based semiconductor manufacturer specializing in optoelectronics, discrete power devices, and analog ICs, with global manufacturing and quality certifications.
The SD09A-E series belongs to Lite-On's high-voltage SIDAC product line, engineered specifically for robust, self-triggered switching in AC pulse ignition and transient protection circuits.
FAQ
What is the minimum breakover current (IBO) required to trigger SD09A240E?
The SD09A240E is specified to trigger at a breakover current of 35 µA, measured under standard sine-wave test conditions. This value is fixed by internal device structure and remains stable across its operating temperature range of –40 °C to +125 °C, ensuring consistent turn-on behavior in ignition and pulse circuits.
Can SD09A240E be used in DC circuits?
Yes - SD09A240E functions in DC applications where voltage across its terminals rises monotonically to exceed its breakover range (220–250 V). However, once triggered, it remains latched until current drops below its dynamic holding current (≤100 mA), requiring external current interruption or circuit reset.
Is SD09A240E compatible with lead-free reflow soldering?
Yes - SD09A240E features matte tin–plated leads compliant with RoHS 2002/95/EC and is rated for maximum lead solder temperature of 260 °C for up to 10 seconds, fully supporting standard Pb-free reflow profiles including JEDEC J-STD-020.
How does glass passivation improve reliability in SD09A240E?
Glass passivation forms a hermetic, chemically inert barrier over the silicon junction, preventing moisture ingress and surface contamination. This maintains stable VBO, low IDRM (≤5 µA), and long-term parameter consistency - critical for outdoor HID lighting and industrial pulse generators exposed to thermal cycling and humidity.
SD09A240E 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:
- -
SD09A240E FAQ
1.How can I place an order for SD09A240E through Aetrix?
Please submit a Request for Quotation (RFQ) for SD09A240E 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 SD09A240E reliable?
The price and inventory of SD09A240E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD09A240E is usually 5 days.
3.What payment methods are accepted for SD09A240E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD09A240E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD09A240E?
SD09A240E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD09A240E 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 SD09A240E?
For technical support, including SD09A240E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD09A240E requirements.
6.How does Aetrix verify that SD09A240E is sourced from the original manufacturer or authorized distributors?
All SD09A240E 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 SD09A240E meets industry standards.
7.What is the process for return or replacement of SD09A240E?
All SD09A240E units undergo pre-shipment inspection (PSI). If there is an issue with SD09A240E, 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 SD09A240E part is unused and in its original packaging.
Return procedure for SD09A240E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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