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SD1A240GW
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Product Detailed Parameters
- Description：THYRISTOR DO-15 T&R 4K
- Series：-
- Mfr：Diodes Incorporated
- Package：Tape & Reel (TR),Cut Tape (CT)
- Voltage - Off State：-
- Voltage - Gate Trigger (Vgt) (Max)：-
- Current - Gate Trigger (Igt) (Max)：-
- Current - Hold (Ih) (Max)：-
- Current - Non Rep. Surge 50, 60Hz (Itsm)：-
- SCR Type：-
- Operating Temperature：-
- Grade：-
- Qualification：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Voltage - On State (Vtm) (Max)：-
- Current - On State (It (AV)) (Max)：-
- Current - On State (It (RMS)) (Max)：-
- Current - Off State (Max)：-
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Overview
The SD1A240GW is a bidirectional thyristor surge protection device from the SIDAC series, manufactured by Lite-On Semiconductor Corporation. It operates in a DO-15 axial leaded package and provides symmetrical blocking capabilities with a peak repetitive off-state voltage (VDRM/VRRM) of ±180 V. The breakover voltage (VBO) ranges from 210 V to 240 V DC, triggering conduction at a breakover current (IBO) of 0.5 mA. Once triggered, it latches on with a holding current (IH) maximum of 65 mA. The device supports an RMS on-state current (IT(RMS)) of 1 A and can withstand a non-repetitive surge current (ITSM) of 20 A for one cycle at 60 Hz. It functions within a junction temperature range of -40°C to +125°C.
Feature Summary
- Bidirectional crowbar protection mechanism for transient suppression
- Symmetrical voltage blocking characteristics for AC line applications
- Compact DO-15 axial package design for space-constrained layouts
Applications
- Protection of telecommunication equipment against lightning-induced transients
- Surge protection for AC power lines and sensitive electronic circuits
- Overvoltage protection in industrial control systems
Procurement Notes
Verify the manufacturer designation as Lite-On Semiconductor Corporation (LSC) rather than Diodes Incorporated, as the provided datasheet explicitly identifies LSC as the producer. Confirm the specific ordering suffix 'GW' corresponds to the standard DO-15 axial package configuration described in the documentation. Ensure compliance with the RoHS directive and UL recognition file E219635 requirements during sourcing.
Selection Notes
Select this component when designing circuits requiring symmetrical bidirectional surge protection with a precise breakover threshold between 210 V and 240 V. The 1 A RMS current rating suits moderate energy dissipation needs, while the ±180 V blocking voltage ensures safe operation below the trigger point. Consider the thermal resistance of 18°C/W and the 65 mA holding current limit when evaluating latch-up behavior in low-current environments.
Part Context
The SD1A240GW belongs to the SIDAC family of silicon bidirectional thyristors designed specifically for overvoltage protection. These devices function as voltage-triggered switches, remaining high-impedance until the applied voltage exceeds the breakover threshold. This family includes variants with different voltage ratings, such as 120 V and 220 V options, all sharing similar structural characteristics and package types for standardized integration into protection circuits.
Replacement Considerations
Direct substitutes must match the ±180 V blocking voltage and 210–240 V breakover range. Equivalent components include other SIDAC-type thyristors in the DO-15 package with comparable IT(RMS) and IH specifications. Verify that alternative parts maintain the same symmetrical bidirectional characteristics and thermal performance limits.
