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STMicroelectronics SMP50-240
- Part No.:
- SMP50-240
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP50-240.pdf
- Description:
- THYRISTOR 240V 150A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
SMP50-240 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage crowbar clamping on telecom line interfaces. It features a 240 V stand-off voltage (VRM), 320 V breakover voltage (VBO), 50 A repetitive peak pulse current (10/1000 µs), 12 µA max leakage at VR, and 25 pF capacitance at 50 V - enabling robust lightning and transient suppression in xDSL and T1/E1 line cards.
For engineers reviewing the SMP50-240 datasheet, SMP50-240 pinout, SMP50-240 application, or SMP50-240 equivalent, key selection criteria include its fail-safe short-circuit mode under overvoltage, UL497B and GR-1089 compliance, low capacitance for signal integrity preservation, and SMA package compatibility with high-density telecom PCB layouts.
Technical Context
The SMP50-240 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (300 V typ., 320 V max), sustaining conduction until current falls below 12 mA holding current (IH). Its junction-to-ambient thermal resistance is 120 °C/W in the SMA package, supporting reliable energy dissipation during repeated 50 A surges.
It meets ITU-T K20/K21 (6 kV/1500 A, 10/700 µs), GR-1089 Core (2.5–5 kV, 2/10 µs), and FCC Part 68 Type A (1.5 kV, 10/160 µs) requirements when used with appropriate series impedance - validated via functional test circuits per Figures 9–11 of the official datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 240 V - maximum continuous reverse voltage before triggering; defines safe operating margin for 48 V telecom systems with transients. |
| Breakover Voltage (VBO) | 320 V max - voltage threshold initiating crowbar action; ensures clamping occurs after system-level transient margins. |
| Repetitive Peak Pulse Current | 50 A (10/1000 µs) - sustains multiple lightning-surge events without degradation; enables multi-event protection in central office equipment. |
| Capacitance | 25 pF @ 50 V - minimizes signal distortion on high-speed analog/digital lines (e.g., ADSL up to 2.2 MHz). |
| Holding Current (IH) | 12 mA min - guarantees latched conduction until fault current decays below this level; prevents premature recovery during sustained overvoltage. |
| Leakage Current (IRM) | 2 µA max @ VRM - negligible DC loading on protected line; avoids interference with line supervision or battery feed circuits. |
Pinout & Package
The SMP50-240 is housed in an SMA package (JEDEC DO-214AC), featuring a two-terminal surface-mount configuration optimized for automated assembly and high-current PCB trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive conduction path in forward direction; bidirectional terminal | Connected to line side of telecom interface; forms symmetrical crowbar path with Cathode. |
| Cathode (K) | Negative conduction path in forward direction; bidirectional terminal | Connected to ground or return path; completes low-impedance fault path during surge event. |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe short-circuit mode | Latches into hard short during overvoltage - prevents open-circuit failure and ensures continued protection even after degradation. |
| UL497B certification (E136224) | Validated for primary-side telecom surge protection per FCC Part 68 and GR-1089 - eliminates need for additional qualification testing. |
| UL94 V0 epoxy encapsulation | Self-extinguishing housing withstands arcing energy without flame propagation - meets safety standards for enclosed telecom equipment. |
| No aging under normal operation | Thyristor structure retains electrical parameters over lifetime - ensures long-term reliability in unattended central office deployments. |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting copper-pair DSLAM line cards against induced lightning surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary crowbar protector placed between tip/ring and ground, triggered before downstream ICs experience overstress. Use Value: 25 pF capacitance preserves ADSL2+ signal integrity up to 2.2 MHz; 50 A surge rating handles repeated GR-1089 Level 1 events. | Use Scenario: Safeguarding T1/E1 framer and transformer interfaces in enterprise PBX and channel bank systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on balanced differential pairs, providing symmetric surge diversion without polarity dependence. Use Value: 320 V VBO allows 240 V VRM margin while meeting ITU-T K21 6 kV requirement with ≤20 Ω series impedance. |
| Modem/Fax Terminal Protection | Central Office Equipment Protection |
Use Scenario: Integrated surge protection in residential VoIP gateways and analog fax modems connected to PSTN lines. IC Role / Device Role / Timing Role: First-line defense component mounted directly at RJ-11 connector, shunting surge energy before line driver ICs. Use Value: SMA footprint enables compact layout; 2 µA leakage avoids interfering with ring detection and off-hook sensing circuits. | Use Scenario: Front-end protection in carrier-grade DSLAMs and remote terminals exposed to outdoor cable plant transients. IC Role / Device Role / Timing Role: High-reliability crowbar element in redundant protection stages, coordinated with GDTs and secondary TVS arrays. Use Value: Fail-safe short-circuit behavior ensures no single-point failure disables protection; UL497B approval supports regulatory certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMTPA240 | SMB package (DO-214AA); 100 °C/W Rth(j-a); 0.11 g weight | Higher thermal resistance than SMA; better suited for lower-power or space-constrained layouts where SMB footprint is preferred | Select when board real estate favors SMB or when higher junction temperature rise is acceptable under pulsed conditions. |
| TPA240 | DO-15 through-hole package; 100 °C/W Rth(j-a); 0.40 g weight; lead-forming required | Compatible with legacy wave-solder processes; less suitable for high-density SMT lines | Choose for cost-sensitive, low-volume, or repair/rework scenarios requiring manual assembly or compatibility with DO-15 footprints. |
Compared with SMTPA240 and TPA240, the SMP50-240 offers the lowest thermal resistance among SMA variants (120 °C/W), smallest footprint, and highest manufacturability for automated SMT lines - making it optimal for high-volume telecom line card production where thermal performance and placement accuracy are critical.
Availability
SMP50-240 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interfaces, modem terminals, and central office equipment requiring stable component supply, long-lifecycle support, and full traceability for telecom infrastructure programs.
Supply support for SMP50-240 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, specializing in power management, analog, MEMS, and automotive ICs - with over 40 years of innovation in protection devices.
The Trisil™ product line was developed specifically for fail-safe, high-energy telecom surge protection - targeting compliance with GR-1089, ITU-T K-series, and FCC Part 68 across analog, digital, and hybrid line interface applications.
FAQ
What is the fail-safe behavior of SMP50-240 during overvoltage events?
The SMP50-240 enters a permanent short-circuit state when subjected to overvoltage beyond its rating, ensuring continued protection even after degradation. This fail-safe mode prevents open-circuit failure, maintains system-level fault containment, and complies with UL497B requirements for telecom safety - verified via functional test circuit 3 (Figure 11) in the datasheet.
Can SMP50-240 be used in AC line protection applications?
No - SMP50-240 is specified exclusively for telecom signal-line protection (e.g., tip/ring, xDSL, T1/E1), not AC mains. Its 240 V VRM and 320 V VBO are insufficient for 120/230 VAC RMS systems, and its thermal design lacks the I²t rating required for sustained AC fault currents. Use dedicated AC-rated MOVs or GDTs instead.
How does SMP50-240 differ from standard TVS diodes in telecom protection?
Unlike TVS diodes, SMP50-240 is a thyristor-based crowbar device with latch-and-hold behavior: once triggered, it remains conducting until current drops below 12 mA. This provides lower clamping voltage under high-current surges and inherent fail-safe shorting - whereas TVS diodes exhibit voltage-clamping only during the transient and may degrade open-circuit.
What series impedance is recommended for SMP50-240 in a GR-1089 Level 1 compliant design?
A 20 Ω series resistor is required to meet GR-1089 Core Level 1 (2500 V, 10/1000 µs) per Table 1 in the datasheet. This value limits peak current to 100 A while ensuring the device triggers reliably at 320 V, maintaining coordination with upstream GDTs and downstream ICs - validated using KeyTek System 2 generator with PN246I module.
SMP50-240 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Breakover:
- 320V
- Voltage - Off State:
- 240V
- 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)
SMP50-240 FAQ
1.How can I place an order for SMP50-240 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP50-240 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 SMP50-240 reliable?
The price and inventory of SMP50-240 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP50-240 is usually 5 days.
3.What payment methods are accepted for SMP50-240?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP50-240 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP50-240?
SMP50-240 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP50-240 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 SMP50-240?
For technical support, including SMP50-240 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP50-240 requirements.
6.How does Aetrix verify that SMP50-240 is sourced from the original manufacturer or authorized distributors?
All SMP50-240 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 SMP50-240 meets industry standards.
7.What is the process for return or replacement of SMP50-240?
All SMP50-240 units undergo pre-shipment inspection (PSI). If there is an issue with SMP50-240, 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 SMP50-240 part is unused and in its original packaging.
Return procedure for SMP50-240:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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