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LD431650
Powerex Inc.
SCR MODULE DUAL ISO 1600V 500A
3919 Pcs New Original In Stock
SCR Module 1.6 kV 900 A Series Connection - All SCRs Chassis Mount POW-R-BLOK™ Module
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Minimum 1
5.0 / 5.0
- (72 Ratings)
LD431650
Product Overview
7776882
DiGi Electronics Part Number
LD431650-DGManufacturer
Powerex Inc.
LD431650
Description
SCR MODULE DUAL ISO 1600V 500AInventory
3919 Pcs New Original In Stock
SCR Module 1.6 kV 900 A Series Connection - All SCRs Chassis Mount POW-R-BLOK™ Module
Quantity
Minimum 1
Minimum 1
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LD431650 Technical Specifications
Category
Thyristors, SCRs - Modules
Packaging
-
Series
-
Product Status
Obsolete
Structure
Series Connection - All SCRs
Number of SCRs, Diodes
2 SCRs
Voltage - Off State
1.6 kV
Current - On State (It (AV)) (Max)
500 A
Current - On State (It (RMS)) (Max)
900 A
Voltage - Gate Trigger (Vgt) (Max)
3 V
Current - Gate Trigger (Igt) (Max)
200 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)
16300A, 17000A
Operating Temperature
-40°C ~ 130°C (TJ)
Mounting Type
Chassis Mount
Package / Case
POW-R-BLOK™ Module
Datasheet & Documents
HTML Datasheet
LD431650-DG
Environmental & Export Classification
RoHS Status
RoHS Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.30.0080
Additional Information
Other Names
835-1031
Standard Package
1
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Their after-sales service is prompt and always meets my needs.
de desembre 02, 2025
Received my package sooner than anticipated thanks to their prompt shipment. Very satisfied.
de desembre 02, 2025
Having access to a broad spectrum of products from DiGi Electronics simplifies our procurement decisions.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LD431650 SCR module in a high-temperature industrial environment operating near 125°C junction temperature?
When designing the LD431650 into high-temperature applications, the primary risk is exceeding the 130°C maximum junction temperature under sustained load due to inadequate heatsinking. At elevated ambient temperatures, even moderate conduction losses (from 500A RMS operation) can lead to thermal runaway if thermal interface materials or airflow are suboptimal. Always perform a transient thermal analysis considering worst-case load cycles, and derate current by at least 20% near 125°C ambient. Use forced cooling and low-thermal-resistance mounting (e.g., insulated copper baseplates) to ensure long-term reliability of the LD431650 in such conditions.
Can the LD431650 SCR module be used as a direct replacement for the obsolete Westcode W135N1600S2 in a series-connected medium-voltage AC controller?
The LD431650 can serve as a functional replacement for the Westcode W135N1600S2 in many series-connected AC control systems, given their matching 1.6 kV blocking voltage and dual-SCR topology. However, critical differences exist: the LD431650 has a higher gate trigger current (200 mA max vs. 100 mA) which may require driving circuit upgrades. Additionally, W135N1600S2 had matched dynamic characteristics for voltage sharing, while the LD431650 requires external snubbers in series configurations to ensure equal dv/dt sharing. Verify gate drive compatibility and implement RC snubbers across each SCR to safely substitute the LD431650.
How should I address dv/dt-induced false triggering when integrating the LD431650 in a phase-angle controlled motor drive?
The LD431650 is susceptible to spurious turn-on from high dv/dt transients common in phase-controlled motor drives due to parasitic capacitive coupling within the module. To mitigate this, install RC snubber networks (e.g., 10–47 Ω with 0.1 µF ceramic capacitor) across each SCR section to limit the rate of voltage rise. Additionally, ensure short, symmetric gate wiring and use negative bias (e.g., -2V standby) on gate drivers to improve noise immunity. Under severe EMI conditions, consider adding an external inductor or dv/dt filter on the input line to protect the LD431650.
What are the reliability concerns when replacing the LD431650 with modern press-pack IGBT modules like the Eupec FZ600R12KE3 in a legacy power system?
Replacing the LD431650 with a press-pack IGBT like the Eupec FZ600R12KE3 introduces dual challenges: control complexity and thermal cycling reliability. The LD431650 is line-commutated and thermally robust under slow cycles, whereas IGBTs require active turn-off gate drivers and are more sensitive to short-circuit conditions. Additionally, the mechanical mounting (chassis vs. press-pack) and thermal interface differ significantly, potentially causing uneven pressure and hotspots. If upgrading, a full control system redesign is needed, and the loss profile shifts—IGBTs may run hotter at 60Hz due to switching losses. Maintain compatibility with legacy protection logic when integrating FZ600R12KE3 as an LD431650 alternative.
What PCB and gate drive layout best practices prevent timing skew and current imbalance in the dual SCR sections of the LD431650?
To prevent timing skew and current imbalance in the LD431650’s dual SCRs, use symmetrical gate drive traces with matched trace lengths and impedance (≤50 mΩ resistance differential). Employ separate gate driver loops for each SCR with Kelvin connections to the gate and cathode to avoid shared inductance. Use low-inductance gate resistors (5–10 Ω) close to the module terminals to damp ringing, and minimize loop area in high-di/dt paths. Opto-isolated drivers with adequate slew rate (≥1 A peak) ensure simultaneous triggering. Poor gate layout can cause one SCR to conduct earlier, leading to uneven current sharing and accelerated thermal aging of one die in the LD431650.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LD431650 CAD Models
Powerex Inc. LD431650 PCB symbols & footprints
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