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STMicroelectronics SMP50-270
- Part No.:
- SMP50-270
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP50-270.pdf
- Description:
- THYRISTOR 270V 150A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMP50-270 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage crowbar clamping in telecom line interfaces. It features a 270 V stand-off voltage (VRM), 350 V dynamic breakover voltage (VBO), 12 mA minimum holding current (IH), 25 pF capacitance at 50 V, and 50 A repetitive peak pulse current (10/1000 µs) - deployed in analog/digital xDSL and T1/E1 line cards.
For engineers reviewing the SMP50-270 datasheet, SMP50-270 pinout, SMP50-270 application, or SMP50-270 equivalent, this device is selected for fail-safe short-circuit protection against lightning surges per GR-1089 Core, ITU-T K20/K21, and FCC Part 68 Type A/B requirements - with critical attention to series resistor coordination, thermal derating, and junction-to-ambient thermal resistance (120 °C/W).
Technical Context
The SMP50-270 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (350 V), sustaining conduction until current falls below 12 mA holding threshold. Its fail-safe short-circuit mode ensures equipment remains protected even after end-of-life degradation.
Designed specifically for telecom interface protection, it meets multi-level surge standards including GR-1089 Core (first/second/intra-building), ITU-T K20/K21 (6 kV/1.5 kV), and FCC Part 68 lightning types A (1500 V, 10/160 µs) and B (1000 V, 9/720 µs), requiring external series impedance coordination per standard-specific tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 270 V - maximum continuous reverse voltage before triggering; defines operating margin for 48 V telecom lines with transient headroom. |
| Dynamic Breakover Voltage (VBO) | 350 V @ 100 V/µs - actual turn-on threshold under fast-rising surges; ensures clamping before downstream IC damage. |
| Holding Current (IH) | 12 mA min - minimum current required to sustain conduction; determines minimum load current needed to maintain crowbar state. |
| Capacitance (C) | 25 pF @ 50 V - low signal-line loading for high-speed xDSL (up to 12 Mbps) without insertion loss or echo distortion. |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - withstands repeated lightning-induced surges per GR-1089 first-level testing without parameter shift. |
| Leakage Current (IRM) | 2 µA max @ 243 V - negligible standby power loss and no false triggering on nominal 48 V DC line bias. |
| Junction-to-Ambient Rth(j-a) | 120 °C/W - thermal limit for PCB layout with recommended SMA footprint; requires ≥ 1 cm² copper pour for full 50 A rating. |
Pinout & Package
SMP50-270 is housed in an SMA package (JEDEC DO-214AC), a surface-mount case with two terminals optimized for high-current surge handling and automated assembly. The package features UL94 V0 epoxy, lead-free terminations, and a 2.25–2.90 mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive surge conduction path | Connected to line side of series resistor; carries full surge current during crowbar event. |
| Cathode (K) | Negative surge conduction path | Connected to ground or negative rail; completes low-impedance fault path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar operation | Clamps both positive and negative transients without polarity-sensitive placement - simplifies board layout for AC-coupled telecom lines. |
| Fail-safe short-circuit mode | Guaranteed low-resistance latch-on failure mode per UL497B - prevents open-circuit failure that would leave equipment unprotected. |
| UL94 V0 epoxy encapsulation | Self-extinguishing housing material - satisfies fire-safety requirements for central office and customer premises equipment. |
| JEDEC DO-214AC registration | Standardized mechanical dimensions and soldering profile - ensures compatibility with automated pick-and-place and reflow processes. |
| No aging-related parameter drift | Stable VBO and IH over >10⁵ surge events - eliminates field reliability concerns common in MOV-based protectors. |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
|
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Primary crowbar clamp placed upstream of line transformer and differential receiver ICs. Use Value: 25 pF capacitance avoids signal integrity degradation at frequencies up to 30 MHz; 50 A IPP handles GR-1089 first-level surges without derating. |
Use Scenario: Safeguarding T1/E1 framer and transceiver ICs in channel banks and multiplexers against induced transients. IC Role / Device Role / Timing Role: Bidirectional voltage-triggered protector on balanced receive/transmit pairs referenced to -48 V rail. Use Value: 270 V VRM provides 5.6× margin over -48 V nominal; fail-safe short ensures continued protection even after multiple surge events. |
| ISDN Terminal Protection | Central Office Line Card |
|
Use Scenario: Surge hardening of ISDN BRI U-interface circuits in NT1 devices and terminal adapters. IC Role / Device Role / Timing Role: First-stage protector between line interface transformer and S/T bus transceiver. Use Value: 350 V VBO ensures clamping before 600 V ITU-T K20 test waveform damages downstream silicon; 12 mA IH compatible with low-current ISDN standby modes. |
Use Scenario: Front-end protection on carrier-grade line cards handling 100+ subscriber lines in digital switches. IC Role / Device Role / Timing Role: Primary crowbar element coordinated with 20–40 Ω series resistors per GR-1089 intra-building requirements. Use Value: 120 °C/W Rth(j-a) enables thermal management across dense line card layouts using shared ground planes and thermal vias. |
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 SP1003-027 | Unidirectional TVS diode array; 275 V standoff; 100 A (8/20 µs); 30 pF | Requires dual-device configuration for bidirectional protection; higher capacitance impacts high-frequency DSL performance | Select when faster response time (<1 ns) is prioritized over crowbar latch behavior and fail-safe assurance |
| Vishay V270LA20AP | Varistor; 270 V AC RMS; 100 J energy rating; 40 pF; degrades after repeated surges | Lacks fail-safe short mode; exhibits parameter drift over lifetime; not UL497B certified | Choose only for cost-sensitive, non-critical applications where long-term reliability and certification are secondary |
Compared with SP1003-027 and V270LA20AP, SMP50-270 delivers guaranteed fail-safe operation, zero aging, and lower capacitance - making it uniquely suitable for carrier-class telecom line cards requiring UL497B compliance and multi-event survivability.
Availability
SMP50-270 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interface modules, ISDN terminal equipment, and central office line cards requiring stable component supply across extended production lifecycles.
Supply support for SMP50-270 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, specializing in power management, analog, MEMS, and automotive ICs - with over 40 years of telecom protection device innovation.
The Trisil™ product line was engineered specifically for fail-safe, high-reliability surge suppression in telecom infrastructure - targeting GR-1089, ITU-T, and FCC-certified equipment where single-point protection failure must be physically impossible.
FAQ
What is the minimum series resistor required for SMP50-270 in a GR-1089 Core first-level application?
Per Table 1, a minimum 20 Ω series resistor is required to limit current to 500 A during a 2500 V, 2/10 µs surge. This value ensures the device triggers within specification while preventing fuse blowing or PCB trace vaporization. Resistor power rating must handle ≥10 W peak for 10 µs duration.
Does SMP50-270 require a heat sink in typical telecom line card use?
No external heat sink is required under normal operation. With 120 °C/W junction-to-ambient thermal resistance and ≤100 mW average dissipation (2 µA × 270 V), temperature rise stays below 15 °C above ambient using the recommended SMA footprint with 1 cm² copper pour - verified per Figure 7.
Can SMP50-270 be used in DC-powered analog phone line interfaces?
Yes - its 270 V VRM provides ample margin over standard -48 V DC telephony rails. The 12 mA minimum holding current is compatible with loop currents as low as 20 mA, and its bidirectional nature accommodates polarity reversal during on-hook/off-hook transitions without additional circuitry.
How does SMP50-270 achieve fail-safe protection compared to MOVs or TVS diodes?
Unlike MOVs (which degrade open-circuit) or TVS diodes (which fail short but lack latching), SMP50-270 is a thyristor that latches into a robust short-circuit state upon surge triggering and remains shorted until current drops below 12 mA - ensuring downstream circuitry stays protected even after catastrophic overstress.
SMP50-270 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 360V
- Voltage - Off State:
- 270V
- 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)
SMP50-270 FAQ
1.How can I place an order for SMP50-270 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP50-270 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 SMP50-270 reliable?
The price and inventory of SMP50-270 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP50-270 is usually 5 days.
3.What payment methods are accepted for SMP50-270?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP50-270 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP50-270?
SMP50-270 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP50-270 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 SMP50-270?
For technical support, including SMP50-270 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP50-270 requirements.
6.How does Aetrix verify that SMP50-270 is sourced from the original manufacturer or authorized distributors?
All SMP50-270 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 SMP50-270 meets industry standards.
7.What is the process for return or replacement of SMP50-270?
All SMP50-270 units undergo pre-shipment inspection (PSI). If there is an issue with SMP50-270, 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 SMP50-270 part is unused and in its original packaging.
Return procedure for SMP50-270:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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