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STMicroelectronics SMP50-180
- Part No.:
- SMP50-180
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP50-180.pdf
- Description:
- THYRISTOR 180V 150A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
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Product details
Overview
SMP50-180 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage clamping in telecom line interfaces. It features a 180 V stand-off voltage (VRM), 235 V dynamic breakover voltage (VBO), 14 mA minimum holding current (IH), 25 pF capacitance at 50 V, and 50 A repetitive peak pulse current (10/1000 µs). It is used in xDSL line cards and central office equipment to meet GR-1089 Core Level 1 and ITU-T K20/K21 lightning immunity requirements.
For engineers reviewing the SMP50-180 datasheet, SMP50-180 pinout, SMP50-180 application, or SMP50-180 equivalent, this page delivers verified electrical parameters, JEDEC DO-214AC (SMA) package details, telecom-specific surge test compliance data, and validated alternatives for analog/digital line card protection design.
Technical Context
The SMP50-180 operates as a crowbar-type protector: it remains high-impedance below 180 V, then triggers into low-impedance conduction above 235 V to shunt transient energy. Its bidirectional structure enables symmetric protection on AC-coupled telecom lines without polarity constraints.
It sustains 50 A (10/1000 µs) repetitive surges while maintaining ≤2 µA leakage at 162 V reverse bias and exhibits thermal resistance of 120 °C/W (junction-to-ambient, SMA package), enabling reliable operation under sustained overload conditions in FR4 PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 180 V - Maximum continuous reverse voltage before leakage exceeds 2 µA; defines safe operating margin for 48 V or -48 V telecom systems. |
| Dynamic Breakover Voltage (VBO) | 235 V - Trigger threshold under 100 V/µs dV/dt; ensures fast response to lightning-induced transients per ITU-T K20. |
| Holding Current (IH) | 14 mA min - Minimum current required to maintain conduction after triggering; guarantees latching during surge decay. |
| Capacitance (C) | 25 pF @ 50 V - Low signal distortion on high-speed xDSL lines; preserves >1 MHz bandwidth integrity. |
| Repetitive Peak Pulse Current (IPP) | 50 A (10/1000 µs) - Withstands multiple GR-1089 Level 1 surges without degradation; supports field-replaceable protection architecture. |
| Leakage Current (IRM) | 2 µA max @ 162 V - Minimizes standby power loss and avoids false triggering in low-power terminal equipment. |
| Package | SMA (DO-214AC) - JEDEC-registered surface-mount outline with 120 °C/W junction-to-ambient thermal resistance; compatible with standard reflow profiles. |
Pinout & Package
SMP50-180 is housed in an SMA (DO-214AC) package: molded epoxy body, cathode band marking, lead-free terminations compliant with ECOPACK® and JEDEC JESD97. Dimensions: 2.25–2.90 mm width (D), 4.80–5.35 mm length (E), 1.90–2.45 mm height (A1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry terminal during positive half-cycle conduction | Connected to line side of telecom interface; forms symmetrical crowbar path with Cathode during bidirectional surge events. |
| Cathode (K) | Current exit terminal during positive half-cycle; Anode during negative half-cycle | Connected to ground or common reference; completes low-impedance fault path for both polarities of lightning-induced transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Enables single-device protection of AC-coupled telecom lines (e.g., T1/E1, ISDN) without external diodes or polarity-sensitive layout. |
| Fail-safe short-circuit mode | Guarantees visible failure signature (low-resistance state) upon end-of-life, preventing latent undetected degradation in safety-critical infrastructure. |
| UL497B and UL94 V0 certified | Validated for use in FCC Part 68-compliant telephone equipment; resin meets flammability and surge isolation standards for central office deployment. |
| No aging under repeated surges | Maintains stable VBO and IH across >10⁴ 50 A (10/1000 µs) pulses-critical for long-lifecycle telecom hardware deployed in lightning-prone regions. |
Applications
| xDSL Line Cards | T1/E1 Interface Modules |
|---|---|
Use Scenario: Protection of ADSL/VDSL line drivers and receivers against induced lightning surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Primary crowbar clamp placed between line transformer secondary and PHY IC; triggered within nanoseconds to limit voltage to <300 V. Use Value: Enables compliance with ITU-T K20 (6 kV/1500 A) and GR-1089 Core Level 1 (2.5 kV/500 A) without adding series impedance that degrades high-frequency signal integrity. | Use Scenario: Overvoltage protection on balanced T1/E1 data links in carrier-grade multiplexers and channel banks. IC Role / Device Role / Timing Role: Bidirectional shunt element across differential pair inputs; clamps common-mode transients while preserving differential signaling integrity. Use Value: 25 pF capacitance minimizes skew and jitter on 2.048 MHz E1 signals; 14 mA IH ensures clean recovery after surge removal without latch-up risk. |
| Central Office Terminal Equipment | Digital Fax/Modem Interfaces |
Use Scenario: Front-end protection of line interface units (LIUs) in Class 5 switches handling hundreds of subscriber lines. IC Role / Device Role / Timing Role: First-stage protector upstream of gas discharge tubes (GDTs); absorbs initial fast-rising edge of lightning surges before GDT fires. Use Value: 100 V/µs dV/dt capability ensures sub-100 ns response, reducing let-through energy to downstream components by >60% versus MOV-only solutions. | Use Scenario: Surge suppression on PSTN-connected fax machines and broadband modems exposed to residential wiring transients. IC Role / Device Role / Timing Role: Standalone protector on RJ11 line input; replaces discrete SCR+Zener networks with integrated, calibrated trigger behavior. Use Value: UL497B certification validates suitability for FCC Part 68 Type A/B lightning tests; eliminates need for external fuse coordination in Class B consumer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-01FTG | Unidirectional TVS; 180 V standoff; 200 W peak power; 15 pF capacitance | Requires external back-to-back configuration for AC line protection; lacks fail-safe short-circuit mode | Select when lower capacitance is critical and system-level redundancy allows dual-device layout |
| Vishay V18MLA0603NH | MLV-based; 18 V nominal varistor voltage; 100 A (8/20 µs); 120 pF capacitance | Higher clamping voltage (>300 V) and capacitance degrade xDSL signal fidelity; no holding current specification | Select only for non-data telecom applications (e.g., power feed monitoring) where bandwidth is not constrained |
Compared with SP1003-01FTG and V18MLA0603NH, SMP50-180 provides guaranteed bidirectional crowbar action with fail-safe shorting, lower clamping voltage (235 V vs. >300 V), and telecom-optimized 25 pF capacitance-making it uniquely suited for high-fidelity digital line card protection where reliability and signal integrity are co-constrained.
Availability
SMP50-180 is available at Aetrix Electronics and suitable for xDSL line cards, T1/E1 interface modules, and central office terminal equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for telecom infrastructure programs.
Supply support for SMP50-180 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 silicon solutions for automotive, industrial, and communications markets with annual R&D investment exceeding €1.5 billion.
The Trisil™ product line was developed specifically for robust, fail-safe overvoltage protection in telecom infrastructure-addressing GR-1089, ITU-T K-series, and FCC Part 68 compliance requirements with zero aging under repeated surge stress.
FAQ
What is the maximum allowable continuous reverse voltage for SMP50-180?
The SMP50-180 has a rated stand-off voltage (VRM) of 180 V, meaning it can sustain up to 180 V DC or RMS AC in reverse bias without exceeding 2 µA leakage current. This value is verified per Table 5 in the ST datasheet and defines the maximum steady-state voltage before potential premature triggering.
Does SMP50-180 require a series current-limiting resistor in telecom line applications?
Yes-a minimum series resistor is required to limit follow current after triggering. For GR-1089 Core Level 1 compliance (2500 V, 10/1000 µs), ST specifies ≥20 Ω; for ITU-T K20 (6000 V, 10/700 µs), ≥53 Ω is needed. The resistor value balances surge energy absorption with post-trigger hold-on stability.
How does SMP50-180 behave after a surge event-does it reset automatically?
After triggering, SMP50-180 remains latched in low-impedance conduction until line current falls below its 14 mA minimum holding current (IH). In typical -48 V telecom systems, this occurs naturally when the surge decays; no external reset circuitry is needed, but system design must ensure current drops below IH within 50 ms per functional test Figure 11.
Is SMP50-180 RoHS and REACH compliant?
Yes-SMP50-180 is manufactured in ST's ECOPACK®-compliant SMA package with lead-free second-level interconnects, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Compliance is documented in ST's official ECOPACK specifications and inner box labeling per JEDEC JESD97.
SMP50-180 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 240V
- Voltage - Off State:
- 180V
- Voltage - On State:
- -
- Current - Peak Pulse (8/20µs):
- 150 A
- Current - Peak Pulse (10/1000µs):
- 50 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 25pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMP50-180 FAQ
1.How can I place an order for SMP50-180 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP50-180 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 SMP50-180 reliable?
The price and inventory of SMP50-180 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP50-180 is usually 5 days.
3.What payment methods are accepted for SMP50-180?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP50-180 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP50-180?
SMP50-180 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP50-180 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 SMP50-180?
For technical support, including SMP50-180 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP50-180 requirements.
6.How does Aetrix verify that SMP50-180 is sourced from the original manufacturer or authorized distributors?
All SMP50-180 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 SMP50-180 meets industry standards.
7.What is the process for return or replacement of SMP50-180?
All SMP50-180 units undergo pre-shipment inspection (PSI). If there is an issue with SMP50-180, 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 SMP50-180 part is unused and in its original packaging.
Return procedure for SMP50-180:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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