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STMicroelectronics LCP1531RL
- Part No.:
- LCP1531RL
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LCP1531RL.pdf
- Description:
- THYRISTOR 60A 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
LCP1531RL from STMicroelectronics is a dual-channel programmable transient voltage suppressor (Trisil™) designed for SLIC protection in VoIP residential gateways. It features dual thyristor-based crowbar clamping for negative surges (VGn = −175 V max), diode clamping for positive overvoltages, 37.5 A peak pulse current (5/310 µs), 5 mA max gate triggering current (IGT), and SO-8 package with integrated gate decoupling support.
For engineers reviewing the LCP1531RL datasheet, LCP1531RL pinout, LCP1531RL application, or LCP1531RL equivalent, this device is selected for telecom line-card surge protection where precise negative firing threshold programming, low dynamic switching voltages (VFP, VDGL), fail-safe short-circuit behavior, and compliance with GR-1089 Core/ITU-T K20-K21 are critical design requirements.
Technical Context
The LCP1531RL implements a dual crowbar architecture: two back-to-back thyristors suppress negative transients referenced to −VBAT via gate control, while two series diodes clamp positive surges to GND. Its gate-triggering circuit enables programmable negative breakdown voltage without external bias components.
It operates with a minimum holding current of 150 mA and supports fast surge response via optional 100–220 nF gate decoupling capacitance, reducing dynamic switching voltage during 2/10 µs and 5/310 µs lightning strikes per IEC 61000-4-5 and TIA-968-A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak pulse current | 37.5 A (5/310 µs); sustains telecom lightning surge testing per ITU-T K20/K21 and GR-1089 Core Second Level. |
| Negative firing voltage range | VGn = −175 V max; sets programmable crowbar activation threshold for −VBAT-referenced SLIC protection. |
| Gate triggering current | IGT = 5 mA max; minimizes PCB current draw during surge initiation, enabling low-power gate drive design. |
| Dynamic switching voltage | VDGL = 7 V max (10/700 µs, IPP = 27.5 A); limits voltage overshoot at SLIC Tip/Ring pins during fast transients. |
| Holding current | IH = 150 mA min; ensures reliable latching during surge conduction and clean turn-off post-surge. |
| Package thermal resistance | Rth(j-a) = 120 °C/W; defines power dissipation limit in SO-8 footprint under natural convection conditions. |
| Gate decoupling capacitance | CG = 100–220 nF recommended; reduces VDGL during fast edges by accelerating thyristor turn-on. |
Pinout & Package
The LCP1531RL is housed in a standard SO-8 package (ECOPACK® compliant, UL94 V0 resin, lead-free), with 1.27 mm pitch, 4.90 mm body width, and 6.00 mm body length. Pin 1 is marked with a dot; device orientation follows JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TIP | Line-side terminal (Tip) | Connects to telephone line Tip conductor; participates in both diode clamping (positive) and thyristor crowbar (negative). |
| GND | Ground reference | Common return path for clamped surge current; serves as reference for gate bias and VDGL measurement. |
| RING | Line-side terminal (Ring) | Connects to telephone line Ring conductor; symmetric role to TIP in dual-line protection topology. |
| Gn | Gate control node | Provides gate bias reference to −VBAT; determines negative firing threshold; requires external decoupling capacitor (100 nF typical). |
| NC | No connect | Internally unconnected pin; must remain floating or tied to GND per layout best practice to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual programmable transient suppression | Independent thyristor channels for Tip and Ring lines enable symmetrical, battery-referenced negative surge clamping without external resistive dividers. |
| Fail-safe short-circuit mode | Trisil™ structure latches on surge and remains conductive until current falls below 150 mA, preventing re-strike and ensuring robust fault containment. |
| Low gate triggering current | 5 mA max IGT allows direct drive from low-current SLIC monitoring circuits or discrete transistor gates, eliminating need for high-drive buffers. |
| UL497B and UL94 V0 certified | Meets safety standards for telecom interface protection components, supporting regulatory certification of end equipment (e.g., GR-1089, YDT695). |
| Optimized for high-voltage SLICs | Designed specifically for next-gen VoIP SLICs operating at −48 V battery rails, with validated performance down to −175 V VGn and 37.5 A IPP. |
Applications
| VoIP Residential Gateway Protection | DSL/Fiber Line Card Surge Suppression |
|---|---|
Use Scenario: Protecting SLIC interfaces in home gateways exposed to lightning-induced surges on POTS lines. IC Role / Device Role / Timing Role: Dual-channel crowbar suppressor that clamps negative transients to −VBAT and positive transients to GND, acting as primary front-end protection element. Use Value: Enables compliance with ITU-T K21 (6 kV/37.5 A) and GR-1089 Core (5 kV/500 A) using only one SO-8 device and minimal external components. | Use Scenario: Safeguarding WLL and fiber-in-the-loop central office line cards against induced surges from nearby power lines or grounding faults. IC Role / Device Role / Timing Role: Programmable transient suppressor interfacing between twisted-pair line and high-voltage SLIC, providing fail-safe crowbar action during fast 2/10 µs events. Use Value: Reduces required series fuse/PTC resistance (down to 0 Ω for intra-building GR-1089) due to low VDGL and high IPP margin. |
| Remote Central Office Equipment | Telecom Power Induction Test Compliance |
Use Scenario: Protecting remote DSLAMs and ONU units deployed in unconditioned outdoor cabinets subject to repeated surge stress. IC Role / Device Role / Timing Role: Primary SLIC protection IC with non-aging Trisil™ structure, delivering consistent clamping performance over 10+ years of field operation. Use Value: Eliminates parameter drift and wear-out failure modes common in MOV-based protectors, ensuring long-term reliability without recalibration. | Use Scenario: Meeting TIA-968-A lightning surge Type A/B requirements (1.5 kV/800 A, 1.5 kV/9 A) in telecom line interface designs. IC Role / Device Role / Timing Role: Fast-acting transient suppressor that fires within nanoseconds of threshold exceedance, limiting voltage rise across SLIC input capacitance. Use Value: Achieves pass-level performance with 100 nF gate capacitor and no additional timing components, simplifying BOM and layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable thyristor-based SLIC protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SLVU2.8-4 | Unidirectional TVS array (2.8 V clamping), no gate control or crowbar latching; 30 A IPP (8/20 µs). | Limited to low-voltage DC rail protection; cannot replace LCP1531RL's −VBAT-referenced negative surge suppression. | Select only for non-battery-referenced, low-energy ESD-only scenarios-not for SLIC ringing surge compliance. |
| TPD4E001DPYR | Quad-channel ESD protector (±15 kV contact), 12 pF channel capacitance, no surge current rating beyond IEC 61000-4-2. | Designed for board-level ESD only; lacks ITU-T K20/K21 or GR-1089 surge capability and thyristor latching behavior. | Use only for secondary ESD hardening downstream of primary LCP1531RL protection-not as functional substitute. |
Compared with SLVU2.8-4 and TPD4E001DPYR, the LCP1531RL uniquely delivers programmable negative firing voltage, fail-safe crowbar latching, and validated 37.5 A lightning surge handling-making it irreplaceable for primary SLIC protection in carrier-grade VoIP infrastructure.
Availability
LCP1531RL is available at Aetrix Electronics and suitable for VoIP residential gateways, DSL line cards, remote central office equipment, and telecom power induction test compliance requiring stable component supply and full production traceability.
Supply support for LCP1531RL 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and protection devices for industrial, automotive, and communications markets.
The LCP1531RL belongs to ST's Trisil™ programmable transient suppressor product line, engineered specifically for fail-safe, high-reliability SLIC protection in next-generation telecom infrastructure where battery-referenced surge clamping and regulatory compliance are mandatory.
FAQ
What is the recommended gate decoupling capacitance for LCP1531RL?
The datasheet specifies a recommended gate decoupling capacitance of 100 nF (minimum 100 nF, typical 220 nF). This capacitor must be placed as close as possible between the Gn pin and ground to minimize inductance and reduce VDGL during fast surge edges. Values outside the 100–220 nF range may degrade dynamic switching voltage performance or delay turn-on timing.
Does LCP1531RL require external bias resistors to set the negative firing voltage?
No. The LCP1531RL uses an internal gate-reference structure tied to −VBAT, eliminating the need for external resistor dividers to program VGn. Its negative firing voltage is inherently set by the battery rail and internal doping profile, with maximum VGn specified at −175 V - making it simpler to implement than adjustable TVS or SCR-based solutions.
Can LCP1531RL be used in automotive or safety-critical applications?
No. ST explicitly states that LCP1531RL is not authorized for use in automotive, aerospace, medical, or safety-critical applications such as life-support systems. It is qualified only for telecom infrastructure - specifically VoIP gateways, DSL line cards, and remote central office equipment meeting GR-1089, ITU-T K20/K21, and YDT695 standards.
How does LCP1531RL behave after a surge event?
After a surge, the LCP1531RL remains latched in low-impedance conduction until the current through the thyristor falls below its 150 mA minimum holding current (IH). Once IH is no longer sustained - typically after surge decay - the device automatically resets to high-impedance blocking state, restoring normal line operation without manual intervention or power cycling.
LCP1531RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- LCP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- -
- Voltage - Off State:
- -
- Voltage - On State:
- -
- Current - Peak Pulse (8/20µs):
- 60 A
- Current - Peak Pulse (10/1000µs):
- 25 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 2
- Capacitance:
- 35pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LCP1531RL FAQ
1.How can I place an order for LCP1531RL through Aetrix?
Please submit a Request for Quotation (RFQ) for LCP1531RL 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 LCP1531RL reliable?
The price and inventory of LCP1531RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LCP1531RL is usually 5 days.
3.What payment methods are accepted for LCP1531RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LCP1531RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LCP1531RL?
LCP1531RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LCP1531RL 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 LCP1531RL?
For technical support, including LCP1531RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LCP1531RL requirements.
6.How does Aetrix verify that LCP1531RL is sourced from the original manufacturer or authorized distributors?
All LCP1531RL 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 LCP1531RL meets industry standards.
7.What is the process for return or replacement of LCP1531RL?
All LCP1531RL units undergo pre-shipment inspection (PSI). If there is an issue with LCP1531RL, 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 LCP1531RL part is unused and in its original packaging.
Return procedure for LCP1531RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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