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Diodes Incorporated SD1A150A
- Part No.:
- SD1A150A
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- -
- Datasheet:
-
SD1A150A.pdf
- Description:
- THYRISTOR SMA T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SD1A150A(LS) from Diodes Incorporated is a unidirectional SIDAC (Silicon Diode for Alternating Current) thyristor designed for high-voltage AC triggering in gas igniter circuits, featuring a 142–157 Vdc breakover voltage (VBO), 120 Vdc peak repetitive off-state voltage (VDRM), and 1 A RMS on-state current rating in an SMA (DO-214AC) package.
For engineers reviewing the SD1A150A datasheet, SD1A150A pinout, SD1A150A application, or SD1A150A equivalent, this device serves as a compact, RoHS-compliant, lead-free high-voltage trigger switch with verified 60 mA holding current, 80 A/μs critical di/dt, and thermal resistance of 15 °C/W - key parameters for reliable ignition pulse generation in resistive-inductive loads.
Technical Context
The SD1A150A(LS) operates as a two-terminal, self-triggering bidirectional switching device in AC circuits - though classified unidirectional in its conduction path due to internal asymmetry - initiating conduction when applied voltage exceeds its VBO range (142–157 Vdc) under specified IBO = 5 μA test condition. It latches until current falls below IH ≤ 60 mA.
Its dynamic behavior is characterized by a minimum critical rate of rise of on-state current (di/dt) of 80 A/μs, ensuring robust turn-on without false triggering during fast transients, and exhibits low on-state voltage drop (VTM = 1.1–1.5 V at IT = 1 A), minimizing power loss during conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBO Range | 142–157 Vdc - defines precise AC voltage threshold for reliable, repeatable ignition pulse initiation |
| VDRM | 120 Vdc - maximum repetitive blocking voltage before conduction, sets safe operating margin in 120 VAC line applications |
| IH (Max) | 60 mA - minimum current required to maintain conduction; determines minimum load impedance for stable latch |
| IT(RMS) | 1 A - continuous RMS current handling capability at TL = 80°C, supports sustained ignition coil drive |
| RthJC | 15 °C/W - junction-to-case thermal resistance enables effective heat dissipation in compact SMA footprint |
| di/dt (Min) | 80 A/μs - ensures immunity to spurious turn-on from voltage transients during AC zero-crossing switching |
| VTM | 1.1–1.5 V @ 1 A - low forward voltage drop reduces power dissipation and thermal stress during conduction |
Pinout & Package
Package: SMA (JEDEC DO-214AC), surface-mount molded plastic housing with matte tin-plated leads; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.070 g.
| 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 surge currents |
| Cathode (K) | Low-side current exit terminal | Connected to ground or load return; forms complete conduction path with Anode during triggered state |
Key Features
| Feature | Design Value |
|---|---|
| Breakover voltage tolerance | ±5% around 150 V (142–157 V) - enables precise, consistent ignition timing across production lots |
| Lead-free & halogen-free construction | RoHS 3 compliant (2015/863/EU); <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental and safety regulations |
| Compact SMA footprint | DO-214AC outline (4.5 × 2.7 × 2.2 mm) - saves PCB space vs. axial or larger TO packages in space-constrained igniters |
| High di/dt immunity | 80 A/μs minimum - prevents misfiring from EMI or line noise in electrically noisy appliance environments |
Applications
| Gas Oven Ignition | Water Heater Pilot Light |
|---|---|
Use Scenario: Replaces spark-gap or piezoelectric igniters in residential gas ovens requiring timed, high-energy pulses to ignite main burners. IC Role / Device Role / Timing Role: Unidirectional thyristor acting as voltage-triggered switch that discharges stored capacitor energy into ignition coil at precise AC phase angle. Use Value: Enables consistent 150 V breakover threshold and 1 A RMS current delivery to generate ≥10 kV spark without mechanical wear or battery dependency. | Use Scenario: Integrated into standing pilot light control circuits of tank-type water heaters to initiate flame sensing and safety lockout sequencing. IC Role / Device Role / Timing Role: High-voltage trigger element that initiates pilot gas flow only after confirmed AC line presence and valid VBO crossing. Use Value: Provides fail-safe operation via 60 mA holding current - automatically resets if flame sensor fails or gas valve closes prematurely. |
| Gas Dryer Igniter | Commercial Cooking Equipment |
Use Scenario: Used in vented gas dryers where rapid, repeatable ignition pulses are needed during drum rotation cycles. IC Role / Device Role / Timing Role: Voltage-sensitive switch that fires once per half-cycle when line voltage exceeds VBO, enabling synchronized coil discharge. Use Value: Delivers 280 A non-repetitive surge current capability (ITSM) to sustain multiple ignition attempts under cold-start conditions. | Use Scenario: Embedded in commercial griddles, fryers, and steam tables requiring UL-certified, maintenance-free ignition subsystems. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays in high-cycle ignition duty, rated for >100,000 operations. Use Value: Leverages 125°C max junction temperature and 15 °C/W RthJC to operate reliably in thermally demanding enclosures without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage unidirectional thyristor triggering applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SD1A150A | Original part: VBO 142–157 V, IH ≤ 60 mA, SMA package | Optimized for gas igniter timing precision and thermal reliability in consumer appliances | Select when exact VBO centering at 150 V and RoHS 3 compliance are mandatory |
| BT169G-TR | SCR (not SIDAC); requires gate trigger; VDRM = 400 V; IH = 5 mA | Needs external timing/control circuitry; unsuitable for self-triggering AC applications | Only viable with redesign to add gate driver and zero-cross detection |
Compared with BT169G-TR, the SD1A150A eliminates gate drive complexity and delivers deterministic breakover timing directly from AC line voltage - essential for cost-sensitive, maintenance-free gas ignition systems where simplicity and repeatability outweigh higher voltage headroom.
Availability
SD1A150A(LS) is available at Aetrix Electronics and suitable for gas oven ignition, water heater pilot control, and commercial cooking equipment requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant manufacturing.
Supply support for SD1A150A(LS) 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for power management, signal integrity, and protection.
The SD1A150A belongs to Diodes' high-voltage thyristor product line, engineered specifically for solid-state AC ignition in gas-fired appliances - emphasizing tight VBO tolerance, thermal robustness, and regulatory compliance over general-purpose switching.
FAQ
What is the difference between SD1A150A(LS) and standard SD1A150A?
The "(LS)" suffix denotes Diodes' "Lead-Free, Halogen- and Antimony-Free" Green version, meeting RoHS 3 (2015/863/EU) and JEDEC J-STD-020 moisture sensitivity Level 1 requirements. Electrically identical to non-LS variants, but with matte tin-plated leads and stricter material composition limits (<900 ppm Br/Cl, <1000 ppm Sb).
Can SD1A150A(LS) be used in DC circuits?
No - the SD1A150A(LS) is designed exclusively for AC-triggered applications. Its unidirectional conduction and breakover mechanism rely on AC voltage polarity reversal to reset; in DC, it would latch permanently after triggering unless externally commutated, which is not supported by its two-terminal structure.
What is the recommended minimum load impedance for reliable holding current operation?
At 120 VAC RMS, the minimum load impedance should be ≤ 2 kΩ to ensure peak current exceeds 60 mA IH during each half-cycle. For example, a 1.8 kΩ resistive load yields ~67 mA peak current, satisfying the latch condition while allowing margin for aging and temperature drift.
Does SD1A150A(LS) require a series current-limiting resistor?
Yes - a series resistor (typically 10–47 Ω, 1–2 W) is required between the AC source and the anode to limit peak surge current during breakover and protect the device from exceeding its 280 A ITSM rating, especially when driving inductive ignition coils with low DCR.
SD1A150A 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:
- -
SD1A150A FAQ
1.How can I place an order for SD1A150A through Aetrix?
Please submit a Request for Quotation (RFQ) for SD1A150A 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 SD1A150A reliable?
The price and inventory of SD1A150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD1A150A is usually 5 days.
3.What payment methods are accepted for SD1A150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD1A150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD1A150A?
SD1A150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD1A150A 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 SD1A150A?
For technical support, including SD1A150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD1A150A requirements.
6.How does Aetrix verify that SD1A150A is sourced from the original manufacturer or authorized distributors?
All SD1A150A 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 SD1A150A meets industry standards.
7.What is the process for return or replacement of SD1A150A?
All SD1A150A units undergo pre-shipment inspection (PSI). If there is an issue with SD1A150A, 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 SD1A150A part is unused and in its original packaging.
Return procedure for SD1A150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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