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STMicroelectronics SMTPA220
- Part No.:
- SMTPA220
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMTPA220.pdf
- Description:
- THYRISTOR 220V 150A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,544
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Product details
Overview
SMTPA220 from STMicroelectronics is a bidirectional Trisil™ surge protection device in SMB (DO-214AA) package, designed for telecom line protection with 220 V standoff voltage, 285 V dynamic breakover voltage, 12 mA minimum holding current, 25 pF capacitance at 50 V, and 50 A repetitive peak pulse current (10/1000 µs). It safeguards analog/digital xDSL, T1/E1, and ISDN line cards against lightning-induced transients.
For engineers reviewing the SMTPA220 datasheet, SMTPA220 pinout, SMTPA220 application, or SMTPA220 equivalent, key selection criteria include bidirectional crowbar behavior, fail-safe short-circuit mode under overvoltage, UL497B and GR-1089 compliance, low leakage (<2 µA), and thermal resistance of 100 °C/W (junction-to-ambient).
Technical Context
The SMTPA220 operates as a voltage-triggered bidirectional thyristor-based crowbar, latching on when transient voltage exceeds its dynamic breakover threshold (285 V typical) and remaining conductive until current falls below 12 mA holding current. Its fail-safe short-circuit mode ensures equipment remains protected even after device activation.
Designed for telecom primary-level surge suppression per GR-1089 Core (2500 V/1000 A, 2/10 µs & 10/1000 µs), it meets ITU-T K20/K21, IEC61000-4-5, FCC Part 68 Type A/B, and UL1459 requirements - validated with 100 °C/W thermal resistance and UL94 V0 epoxy encapsulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 220 V - maximum continuous reverse voltage before conduction begins |
| Dynamic Breakover Voltage (VBO) | 285 V typ. - voltage at which device triggers into low-impedance state under fast-rising surge |
| Holding Current (IH) | 12 mA min. - minimum current required to sustain conduction after triggering |
| Capacitance (C) | 25 pF @ 50 V - minimal signal distortion on high-speed telecom lines (e.g., xDSL) |
| Peak Pulse Current (IPP) | 50 A (10/1000 µs) - surge-handling capability matching GR-1089 first-level requirements |
| Leakage Current (IRM) | 2 µA max. @ VRM - negligible standby power loss and no false triggering |
| Thermal Resistance (Rth(j-a)) | 100 °C/W - junction-to-ambient dissipation rating with recommended SMB footprint |
Pinout & Package
SMTPA220 is housed in an SMB (DO-214AA) surface-mount package with cathode/anode terminals. The device is symmetrical and bidirectional; both terminals serve identical roles in surge clamping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point during positive half-cycle | Connects to protected line; forms bidirectional path with Cathode |
| Cathode (K) | Surge current entry point during negative half-cycle | Connects to protected line; enables symmetrical clamping across AC/DC telecom signals |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar operation | Enables single-device protection of AC-coupled telecom lines without polarity constraints |
| Fail-safe short-circuit mode | Guarantees continued protection after activation - critical for UL1459/FCC Part 68 compliance |
| UL497B certified (E136224) | Validated for primary-side telecom surge protection in North American networks |
| UL94 V0 epoxy encapsulation | Meets flammability safety requirement for enclosed telecom equipment housings |
| JEDEC DO-214AA registration | Ensures mechanical compatibility with standard SMB footprint and automated assembly |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting ADSL/VDSL line interface ICs from lightning surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Primary crowbar clamp placed between line transformer secondary and codec input. Use Value: 25 pF capacitance avoids signal integrity degradation up to 30 MHz; 220 V VRM matches typical xDSL common-mode operating range. | Use Scenario: Safeguarding T1/E1 framer and line driver circuits in central office or CPE equipment. IC Role / Device Role / Timing Role: First-stage transient suppressor on balanced receive/transmit pairs prior to isolation transformers. Use Value: 50 A (10/1000 µs) IPP withstands GR-1089 Core first-level surges; bidirectional symmetry supports full-duplex signaling. |
| ISDN BRI Terminal Protection | Fax/Modem Analog Port Protection |
Use Scenario: Securing ISDN basic rate interface (2B+D) ports in PBX or terminal adapters against induced transients. IC Role / Device Role / Timing Role: Standoff-clamp device bridging tip/ring lines to ground, triggered only above 220 V. Use Value: 2 µA max. leakage prevents DC bias shift on D-channel signaling; UL497B approval satisfies carrier certification mandates. | Use Scenario: Hardening analog telephone-line inputs of fax machines and dial-up modems against lightning coupling. IC Role / Device Role / Timing Role: Fail-safe crowbar shunting surge energy directly to chassis ground during ring-trip events. Use Value: Short-circuit failure mode prevents open-circuit disconnect - maintaining POTS service continuity post-surge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMTPA200 | 200 V VRM, 262 V VBO, 12 mA IH, same SMB package | Suitable for lower-voltage analog line interfaces where 220 V standoff is excessive | Select when system operating voltage is ≤180 V RMS to improve margin against nuisance triggering |
| SMTPA240 | 240 V VRM, 300 V VBO, 12 mA IH, same SMB package | Required for higher-voltage digital loop carrier or extended-range xDSL deployments | Choose for systems exposed to elevated steady-state line voltages (e.g., long-loop T1) needing >220 V standoff |
Compared with SMTPA200 and SMTPA240, SMTPA220 provides optimal balance for standard 220–240 VAC-powered telecom gear: its 220 V VRM avoids false triggering on nominal line peaks while retaining sufficient headroom for transient suppression per GR-1089.
Availability
SMTPA220 is available at Aetrix Electronics and suitable for DSL line card design, T1/E1 interface hardening, and ISDN terminal protection requiring stable component supply and full regulatory documentation traceability.
Supply support for SMTPA220 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, delivering intelligent power, sensing, and control solutions across automotive, industrial, and communications markets.
The Trisil™ product line was engineered specifically for robust, fail-safe primary-side surge protection in telecom infrastructure - emphasizing reliability under repeated lightning strikes and compliance with GR-1089, ITU-T K-series, and UL standards.
FAQ
What is the fail-safe behavior of SMTPA220 during overvoltage events?
SMTPA220 enters a permanent low-impedance short-circuit state when triggered by a surge exceeding its breakover voltage, ensuring downstream circuitry remains protected even if the device sustains damage. This fail-safe mode is certified per UL497B and required for FCC Part 68 compliance in telecom applications.
Can SMTPA220 be used in AC or DC telecom line protection?
Yes - SMTPA220 is inherently bidirectional and functions identically on AC-coupled (e.g., POTS, ISDN) and DC-biased (e.g., xDSL, T1) telecom lines. Its symmetrical structure eliminates polarity concerns, and the 220 V VRM accommodates peak AC line voltages while clamping fast transients.
How does SMTPA220's 25 pF capacitance impact high-speed data lines?
At 25 pF measured at 50 V bias and 1 MHz, SMTPA220 introduces negligible insertion loss on xDSL lines up to 30 MHz. Its low capacitance preserves signal integrity and return loss performance, unlike higher-capacitance MOVs or GDTs that degrade high-frequency transmission.
Is SMTPA220 RoHS-compliant and lead-free?
Yes - SMTPA220 is supplied in ST's ECOPACK® package with lead-free second-level interconnect, compliant with RoHS Directive 2011/65/EU. The inner box label and package marking indicate the lead-free status per JEDEC JESD97, and soldering profiles follow JEDEC J-STD-020 moisture sensitivity level MSL3.
SMTPA220 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 293V
- Voltage - Off State:
- 220V
- 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:
- SMB
SMTPA220 FAQ
1.How can I place an order for SMTPA220 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMTPA220 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 SMTPA220 reliable?
The price and inventory of SMTPA220 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMTPA220 is usually 5 days.
3.What payment methods are accepted for SMTPA220?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMTPA220 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMTPA220?
SMTPA220 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMTPA220 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 SMTPA220?
For technical support, including SMTPA220 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMTPA220 requirements.
6.How does Aetrix verify that SMTPA220 is sourced from the original manufacturer or authorized distributors?
All SMTPA220 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 SMTPA220 meets industry standards.
7.What is the process for return or replacement of SMTPA220?
All SMTPA220 units undergo pre-shipment inspection (PSI). If there is an issue with SMTPA220, 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 SMTPA220 part is unused and in its original packaging.
Return procedure for SMTPA220:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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