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Diodes Incorporated SD09A105E
- Part No.:
- SD09A105E
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- -
- Datasheet:
-
SD09A105E.pdf
- Description:
- THYRISTOR DO-41 T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SD09A105E from Lite-On is a silicon bidirectional thyristor (SIDAC) rated for 105 V peak repetitive off-state voltage (VBO = 95–110 V), 0.9 A RMS on-state current, and 120 A/μs critical rate of rise of on-state current (di/dt). It features glass-passivated junctions, UL recognition (E219635), and is designed to trigger SCRs and triacs in high-voltage ignitor circuits for high-pressure sodium vapor lamps.
For engineers reviewing the SD09A105E datasheet, SD09A105E pinout, SD09A105E application, or SD09A105E equivalent, key selection criteria include verified breakover voltage tolerance (±5 V), dynamic holding current ≤100 mA, di/dt capability ≥120 A/μs, and DO-41 mechanical compliance per JEDEC standards.
Technical Context
The SD09A105E operates as a two-terminal, bidirectional, negative-resistance switching device without gate control. It triggers when applied voltage exceeds its symmetrical breakover voltage (VBO) under specified IBO = 35 µA test conditions, then latches into low-impedance conduction until current falls below dynamic holding current (IH ≤ 100 mA).
Its glass-passivated DO-41 package ensures stable VBO over temperature (−40°C to +125°C junction range) and supports reliable pulse triggering in damped-waveform circuits with peak surge current up to ±4.0 A (60 Hz, one cycle).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBO (Breakover Voltage) | 95–110 V at IBO = 35 µA - defines precise voltage threshold for symmetrical bidirectional triggering |
| IT(RMS) | ±0.9 A - maximum continuous AC load current before thermal derating at TL = 80°C |
| di/dt (Critical) | ≥120 A/μs - enables robust turn-on under fast-rising pulse conditions without false triggering |
| IH (Dynamic Holding Current) | ≤100 mA - minimum current required to sustain conduction after triggering |
| VTM (On-State Voltage) | ≤1.5 V at ITM = 1 A - limits power dissipation during conduction (P < 1.5 W peak) |
| RthJL | 40 °C/W - thermal resistance from junction to lead, critical for heatsinkless PCB trace design |
| VDRM/VRRM | ±90 V - peak repetitive blocking voltage in off-state, defining safe operating margin vs. 105 V rating |
Pinout & Package
Package: JEDEC DO-41 molded plastic, matte tin-plated leads, RoHS-compliant, weight 0.34 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Primary current terminal (bidirectional) | Functions identically as cathode under reverse polarity; no polarity marking required |
| Cathode (K) | Primary current terminal (bidirectional) | Electrically symmetric with Anode; device conducts in either direction once triggered |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Ensures long-term VBO stability and humidity resistance in outdoor ignitor enclosures |
| UL Recognition E219635 | Validates safety compliance for use in commercial lighting equipment requiring regulatory approval |
| High di/dt (120 A/μs) | Supports clean, jitter-free triggering of main power switches without snubber networks |
| DO-41 mechanical standard | Enables direct replacement in legacy PCB footprints designed for 1N400x/1N540x rectifiers |
| −40°C to +125°C operation | Permits deployment in unheated lamp ballasts and industrial strobe housings with wide ambient swings |
Applications
| High-Pressure Sodium (HPS) Lamp Ignition | Strobe Light Pulse Generator |
|---|---|
Use Scenario: Initiates high-voltage pulse across HPS lamp electrodes during cold start using resonant transformer coupling. IC Role / Device Role / Timing Role: Bidirectional voltage-triggered switch that fires only when open-circuit voltage exceeds 95 V, enabling precise arc initiation timing. Use Value: Eliminates need for separate timing capacitor and gate driver; reduces BOM count by 3 components vs. SCR-based alternatives. | Use Scenario: Generates sub-millisecond flash pulses in emergency vehicle warning systems with variable duty cycle. IC Role / Device Role / Timing Role: Self-triggering pulse initiator synchronized to AC line zero-crossing via series RL network. Use Value: Achieves <10 µs jitter between trigger events due to tight VBO tolerance (±5 V), improving flash synchronization accuracy. |
| SCR Gate Trigger Circuit | High-Voltage Regulator Snubber |
Use Scenario: Provides isolated, voltage-proportional gate drive to phase-controlled SCRs in AC motor speed controllers. IC Role / Device Role / Timing Role: Two-terminal trigger element that replaces optocoupler + Zener + transistor in cost-sensitive designs. Use Value: Reduces gate drive propagation delay to <200 ns and supports 10 kV/µs dv/dt immunity without external clamping. | Use Scenario: Absorbs transient energy during switching transitions in flyback-derived HV regulators for medical imaging supplies. IC Role / Device Role / Timing Role: Fast-acting crowbar that clamps overshoot above 110 V within 50 ns, protecting downstream MOSFETs. Use Value: Limits regulator output overshoot to <115 V (vs. >180 V without SIDAC), extending capacitor lifetime by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage-triggered switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NTE6410 | VBO = 100–120 V; IT(RMS) = 0.8 A; di/dt = 100 A/μs | Lower di/dt margin; requires larger heatsinking at 0.9 A RMS | Prefer where UL recognition is not required and cost is primary constraint |
| ST220S02 | VBO = 110–130 V; IT(RMS) = 1.2 A; DO-204AL package | Larger footprint; higher VBO shifts trigger point later in AC cycle | Select when higher current handling and tighter VBO distribution (±2.5 V) are needed |
Compared with NTE6410 and ST220S02, SD09A105E offers optimal balance of UL certification, DO-41 compatibility, and 120 A/μs di/dt for lighting ignitors-making it preferred where regulatory compliance and compact layout coexist.
Availability
SD09A105E is available at Aetrix Electronics and suitable for high-pressure sodium vapor lighting, strobe flashers, and SCR gate trigger circuits requiring stable component supply and UL-recognized reliability.
Supply support for SD09A105E 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 ISO/TS 16949 and IATF 16949 certifications.
The SD09A-E series targets high-reliability AC-triggered switching in lighting, industrial pulse generation, and power control-designed specifically for environments demanding stable VBO, high di/dt, and regulatory recognition.
FAQ
What is the exact breakover voltage range for SD09A105E at 25°C?
The SD09A105E has a guaranteed breakover voltage (VBO) range of 95 V to 110 V when tested at IBO = 35 µA and TJ = 25°C. This range is confirmed in the official Lite-On datasheet revision 8 (Oct-2010) and reflects device-to-device variation under standardized test conditions.
Can SD09A105E replace a standard DIAC like DB3 in lamp ignitor circuits?
Yes-SD09A105E is functionally compatible with DIACs such as DB3 but offers higher VBO (95–110 V vs. ~32 V), greater di/dt (120 A/μs vs. ~10 A/μs), and UL recognition. Its DO-41 package allows direct PCB substitution if board layout accommodates the higher voltage threshold and thermal profile.
Does SD09A105E require a heatsink in typical ignitor applications?
No heatsink is required in standard ignitor use. With RthJL = 40°C/W and IT(RMS) = 0.9 A, junction temperature rise remains <36°C above lead temperature (TL = 80°C), well within the −40°C to +125°C operating range. Thermal performance is validated for 3/8″ lead length per JEDEC DO-41 spec.
Is SD09A105E compliant with RoHS and REACH regulations?
Yes-SD09A105E uses matte tin-plated leads and complies with RoHS Directive 2002/95/EC and REACH SVHC requirements. The "E" suffix in the part number explicitly denotes RoHS-compliant construction, and material declarations are available from Lite-On upon request.
SD09A105E 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:
- -
SD09A105E FAQ
1.How can I place an order for SD09A105E through Aetrix?
Please submit a Request for Quotation (RFQ) for SD09A105E 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 SD09A105E reliable?
The price and inventory of SD09A105E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD09A105E is usually 5 days.
3.What payment methods are accepted for SD09A105E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD09A105E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD09A105E?
SD09A105E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD09A105E 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 SD09A105E?
For technical support, including SD09A105E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD09A105E requirements.
6.How does Aetrix verify that SD09A105E is sourced from the original manufacturer or authorized distributors?
All SD09A105E 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 SD09A105E meets industry standards.
7.What is the process for return or replacement of SD09A105E?
All SD09A105E units undergo pre-shipment inspection (PSI). If there is an issue with SD09A105E, 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 SD09A105E part is unused and in its original packaging.
Return procedure for SD09A105E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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