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STMicroelectronics SMP30-270
- Part No.:
- SMP30-270
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP30-270.pdf
- Description:
- THYRISTOR 270V 70A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,586
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Product details
Overview
SMP30-270 from STMicroelectronics is a bidirectional Trisil™ crowbar protection device designed for telecom line surge suppression in analog/digital subscriber line interfaces. It features a 270 V stand-off voltage (VRM), 350 V dynamic breakover voltage (VBO), 10 mA minimum holding current (IH), 20 pF typical capacitance at 50 V, and 30 A repetitive peak pulse current (10/1000 µs). It is used in xDSL line cards and central office equipment to meet GR-1089 Core and ITU-T K20/K21 lightning immunity requirements.
For engineers reviewing the SMP30-270 datasheet, SMP30-270 pinout, SMP30-270 application, or SMP30-270 equivalent, key selection criteria include stand-off voltage margin vs. line operating voltage, fail-safe short-circuit behavior under surge, low capacitance for signal integrity on high-speed lines (e.g., VDSL2), and UL497B/UL94 V0 compliance for telecom safety certification.
Technical Context
The SMP30-270 operates as a voltage-triggered thyristor-based crowbar: it remains high-impedance below 270 V, then latches into low-impedance conduction above ~350 V, clamping transients by diverting surge current to ground. Its fail-safe short-circuit mode ensures continued protection even after multiple surges.
It is optimized for telecom primary protection stages-placed upstream of IC-level TVS diodes-with thermal design supported by Rth(j-a) = 120 °C/W (on recommended FR4 footprint) and I²t = 5.7 A²s (16.6 ms), enabling coordination with series current-limiting resistors per GR-1089 and FCC Part 68 Type A/B test waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 270 V - Maximum continuous AC/DC line voltage the device blocks without triggering. |
| Dynamic Breakover Voltage (VBO) | 350 V max - Threshold at which device switches to low-impedance state during fast transients (e.g., 2/10 µs lightning). |
| Holding Current (IH) | 10 mA min - Minimum current required to maintain conduction after triggering; ensures reliable latch-on during sustained surges. |
| Capacitance (C) | 20 pF typ. @ 50 V - Low parasitic capacitance preserves signal integrity on broadband telecom lines (e.g., up to 30 MHz in ADSL/VDSL). |
| Repetitive Peak Pulse Current (IPP) | 30 A @ 10/1000 µs - Sustained surge handling capability aligned with GR-1089 Core first-level requirements. |
| Leakage Current (IRM) | 243 µA max @ VRM - Confirmed low DC leakage avoids interference with line biasing or monitoring circuits. |
| Package | SMA (DO-214AC) - JEDEC-standard surface-mount package with UL94 V0 epoxy and lead-free finish. |
Pinout & Package
SMP30-270 uses the SMA (DO-214AC) package: a 2-terminal surface-mount device with cathode/anode configuration. The package has a 5.35 mm × 2.90 mm body, 1.50 mm max lead length, and 0.40 mm max terminal thickness. Thermal performance relies on recommended FR4 pad layout per Figure 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point under positive transient | Connected to protected line (e.g., tip/ring); forms bidirectional path with cathode during either polarity surge. |
| Cathode (K) | Surge current return path to ground reference | Typically tied to system ground or chassis via low-inductance trace; completes crowbar loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Protects both polarities of telecom lines without external polarity-reversal circuitry or dual-device placement. |
| Fail-safe short-circuit mode | Guarantees continued protection after end-of-life degradation-no open-circuit failure risk that would leave downstream ICs exposed. |
| UL497B and UL94 V0 certified | Meets mandatory safety requirements for telecom interface protection in North America and globally harmonized designs. |
| Low 20 pF capacitance @ 50 V | Minimizes insertion loss and phase distortion on high-frequency xDSL signals (e.g., VDSL2 up to 30 MHz). |
Applications
| xDSL Line Cards | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protection of copper pair inputs on DSLAM or CPE line cards subjected to lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary crowbar protector placed before line driver/receiver ICs (e.g., LME49710, SLICs) to clamp >2.5 kV surges per GR-1089. Use Value: Enables compliance with ITU-T K20/K21 and GR-1089 Core first-level tests using only one discrete device per line pair. | Use Scenario: Surge protection on T1/E1 balanced digital trunk interfaces in PBX or transport equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor on transformer-coupled 100 Ω differential lines, coordinated with series impedance to limit let-through energy. Use Value: Maintains signal fidelity (≤20 pF) while surviving 500 A 2/10 µs surges per GR-1089 Core second-level requirements. |
| Central Office Terminal Equipment | FCC Part 68 Compliant Modems |
Use Scenario: Protection of line-side ports in central office line cards handling multiple subscriber loops. IC Role / Device Role / Timing Role: High-reliability primary protector rated for repeated 30 A surges, integrated into modular plug-in card assemblies. Use Value: Eliminates field failures due to aging-related parameter drift-Trisil technology shows no wear-out mechanism over 10⁵ surge events. | Use Scenario: Secondary surge protection in residential VoIP gateways and fax-modem combos connected to POTS lines. IC Role / Device Role / Timing Role: UL497B-certified component ensuring FCC Part 68 lightning surge Type A (1500 V, 10/160 µs) compliance. Use Value: Reduces BOM count by replacing multi-stage TVS+GDT solutions with single-device fail-safe protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom crowbar protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SPA1202 | Unidirectional; 120 V standoff; 30 A IPP; TO-220 package | Requires external polarity management; unsuitable for balanced telecom lines without duplication | Select only for DC-biased, unidirectional protection where space allows through-hole mounting. |
| Vishay V130LA20AP | Varistor-based; 130 V RMS; 6 kA 8/20 µs; higher capacitance (~100 pF) | No fail-safe short-circuit mode; degrades with repeated surges; higher leakage | Acceptable for cost-sensitive secondary protection but not for primary fail-safe telecom roles. |
Compared with SPA1202 and V130LA20AP, SMP30-270 provides bidirectional operation in a compact SMA package with guaranteed fail-safe behavior and lower capacitance-critical for maintaining signal integrity and meeting GR-1089/ITU-T standards in primary telecom line protection.
Availability
SMP30-270 is available at Aetrix Electronics and suitable for xDSL line cards, T1/E1 interface modules, and FCC Part 68-compliant modem designs requiring stable component supply across long-lifecycle telecom infrastructure programs.
Supply support for SMP30-270 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, Switzerland, with R&D and manufacturing operations across Europe, Asia, and the Americas.
The Trisil™ product line was developed specifically for robust, maintenance-free primary surge protection in telecom infrastructure-emphasizing fail-safe reliability, regulatory compliance (UL497B, GR-1089), and long-term stability under repeated lightning stress.
FAQ
What is the fail-safe behavior of SMP30-270 during end-of-life?
SMP30-270 enters a permanent short-circuit state when degraded, maintaining protection by shunting surges to ground. This contrasts with varistors or TVS diodes that may fail open-circuit, leaving downstream circuitry vulnerable. The short-circuit mode is verified per UL497B file E136224 and confirmed in accelerated life testing per IEC61000-4-5.
Can SMP30-270 be used without a series current-limiting resistor?
No-SMP30-270 requires an external series resistor to limit follow current after triggering and prevent thermal runaway. For 270 V line applications, ST recommends ≥20 Ω (per GR-1089 Core first-level) to ensure IH is sustained while limiting power dissipation to within Rth(j-a) limits. Resistor value must be validated against worst-case AC line voltage and source impedance.
How does SMP30-270 compare to standard TVS diodes in telecom protection?
SMP30-270 offers higher surge current rating (30 A vs. typical 10–20 A for SMB/SMA TVS), inherent fail-safe behavior, and lower capacitance than many bidirectional TVS arrays. However, it has slower response (~100 ns vs. <1 ns for TVS) and requires hold-current management-making it ideal for primary protection, while TVS devices serve best as secondary clamps near ICs.
Is SMP30-270 compliant with RoHS and REACH regulations?
Yes-SMP30-270 is manufactured in ST's ECOPACK®-compliant process with lead-free terminations and halogen-free epoxy meeting RoHS Directive 2011/65/EU and REACH SVHC thresholds. Full material declarations and CoC are available via ST's quality portal using order code QAJ.
SMP30-270 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):
- 70 A
- Current - Peak Pulse (10/1000µs):
- 30 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 20pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMP30-270 FAQ
1.How can I place an order for SMP30-270 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP30-270 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 SMP30-270 reliable?
The price and inventory of SMP30-270 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP30-270 is usually 5 days.
3.What payment methods are accepted for SMP30-270?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP30-270 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP30-270?
SMP30-270 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP30-270 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 SMP30-270?
For technical support, including SMP30-270 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP30-270 requirements.
6.How does Aetrix verify that SMP30-270 is sourced from the original manufacturer or authorized distributors?
All SMP30-270 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 SMP30-270 meets industry standards.
7.What is the process for return or replacement of SMP30-270?
All SMP30-270 units undergo pre-shipment inspection (PSI). If there is an issue with SMP30-270, 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 SMP30-270 part is unused and in its original packaging.
Return procedure for SMP30-270:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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