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STMicroelectronics TPA270
- Part No.:
- TPA270
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
TPA270.pdf
- Description:
- THYRISTOR 270V 150A DO-204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,911
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Product details
Overview
TPA270 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device in DO-15 package, designed for telecom line-level crowbar protection with 270 V breakover voltage (VBO), 50 A repetitive peak pulse current (10/1000 µs), and 25 pF capacitance at 50 V. It provides fail-safe short-circuit clamping for analog/digital xDSL, T1/E1, and ISDN line cards.
For engineers reviewing the TPA270 datasheet, TPA270 pinout, TPA270 application, or TPA270 equivalent, this page delivers verified electrical parameters, JEDEC DO-15 terminal mapping, telecom-specific surge compliance (GR-1089, ITU-T K20/K21, FCC Part 68), and direct alternatives for lightning transient suppression in telephony interfaces.
Technical Context
The TPA270 operates as a voltage-triggered bidirectional crowbar device: it remains high-impedance below 243 V stand-off (VRM), triggers at dynamic VBO ≤ 350 V, and latches into low-impedance conduction above 12 mA holding current (IH). Its fail-safe short-circuit mode ensures equipment survival during sustained overvoltage events.
Designed specifically for telecom infrastructure, it meets GR-1089 Core first-level (2500 V / 500 A, 2/10 µs) and ITU-T K20 (6000 V, 10/700 µs) surge immunity requirements when used with appropriate series impedance-e.g., 21.5 Ω for VDE0433 compliance or 12.5 Ω for FCC Part 68 Type A lightning surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakover Voltage (VBO) | ≤350 V dynamic, ≤360 V static - defines precise clamping threshold before crowbar activation |
| Stand-off Voltage (VRM) | 243 V - maximum continuous reverse voltage before leakage exceeds 2 µA |
| Repetitive Peak Pulse Current | 50 A @ 10/1000 µs - sustains repeated lightning-induced transients without degradation |
| Junction Capacitance | 25 pF @ 50 V - minimizes signal distortion on high-speed telecom lines (e.g., xDSL) |
| Holding Current (IH) | ≥12 mA - ensures reliable latch-on during surge and controlled turn-off post-event |
| Leakage Current (IRM) | ≤2 µA @ VRM - prevents DC loading or false triggering in idle line states |
| Package | DO-15 - through-hole JEDEC-standard package with 0.40 g mass and UL94 V0 epoxy |
Pinout & Package
TPA270 uses a 2-terminal DO-15 axial-leaded package per JEDEC TO-206AD. Terminals are non-polarized and function identically in either orientation due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry during positive half-cycle surge | One of two symmetrical terminals; no fixed polarity-connects to protected line |
| Cathode (K) | Current exit during positive half-cycle surge | Electrically identical to Anode; completes crowbar path to ground or return |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Clamps both positive and negative transients without external polarity management |
| Fail-safe short-circuit mode | Latches low-impedance during fault-prevents open-circuit failure and enables fuse coordination |
| UL497B certification (E136224) | Validated for primary-side telecom surge protection per FCC Part 68 and UL1459 |
| UL94 V0 epoxy encapsulation | Meets flammability safety requirement for enclosed telecom equipment housings |
| No aging under repeated surges | Maintains VBO and IH specifications across >10⁴ 50 A pulses-no derating needed in field deployment |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protects copper-pair DSLAM line cards from induced lightning surges on outside plant wiring. IC Role / Device Role / Timing Role: Bidirectional crowbar clamping device placed between tip/ring and ground, triggered by >243 V transients. Use Value: Limits line voltage to <350 V during 50 A surges, preserving downstream SLIC and codec ICs per GR-1089 Core Level 1. | Use Scenario: Shields T1/E1 framer and transformer-coupled interface circuits in central office equipment. IC Role / Device Role / Timing Role: Primary surge arrestor on balanced pair inputs, operating in fail-safe short mode during 10/1000 µs transients. Use Value: Enables compliance with ITU-T K20 (6 kV, 10/700 µs) using only 21.5 Ω series resistance-reducing BOM count vs. multi-stage designs. |
| ISDN Terminal Protection | Fax/Modem Analog Port Protection |
Use Scenario: Integrated into BRI NT1 devices to protect S/T interface against AC power cross-talk and nearby lightning. IC Role / Device Role / Timing Role: Standoff-rated crowbar (243 V VRM) placed ahead of hybrid transformer and line driver. Use Value: Blocks >270 V transients while adding only 25 pF capacitance-preserving 144 kbps ISDN signal integrity. | Use Scenario: Installed on RJ-11 analog ports of fax machines and dial-up modems for residential surge immunity. IC Role / Device Role / Timing Role: First-line protector between telephone line and internal codec, rated for FCC Part 68 Type A (1500 V, 10/160 µs). Use Value: Delivers certified lightning surge protection with 12.5 Ω series resistor-meeting UL1950 and CSA C22.2 without additional TVS stages. |
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 |
|---|---|---|---|
| SMTPA270 | SMB package (DO-214AA), same VBO/IH/IPP specs, lower thermal resistance (Rth(j-l) = 20 °C/W vs. DO-15's 60 °C/W) | Suitable for surface-mount telecom modules where board space is constrained and thermal dissipation is critical | Select SMTPA270 for automated SMT assembly and improved thermal performance; retain TPA270 for through-hole legacy designs or higher mechanical robustness |
| SMP50-270 | SMA package (DO-214AC), identical electrical specs, Rth(j-l) = 30 °C/W, 0.068 g weight vs. TPA270's 0.40 g | Preferred for compact PCB layouts requiring minimal footprint and weight, e.g., portable DSL test equipment | Choose SMP50-270 when minimizing board area and mass is prioritized over manual soldering ease or high-current trace routing |
Compared with SMTPA270 and SMP50-270, TPA270 offers superior mechanical stability and higher thermal mass in DO-15, making it optimal for high-reliability through-hole telecom line cards where vibration resistance and long-term creep performance are critical-while maintaining identical surge clamping behavior.
Availability
TPA270 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interface modules, ISDN NT1 terminals, and analog modem ports requiring stable component supply and full GR-1089/ITU-T K20 compliance.
Supply support for TPA270 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 analog, power, and discrete components for industrial, automotive, and communications markets.
TPA270 belongs to ST's Trisil™ family of bidirectional thyristor surge protectors-engineered specifically for fail-safe, high-reliability transient suppression in telecom infrastructure meeting UL, IEC, and FCC standards.
FAQ
What is the fail-safe behavior of TPA270 during sustained overvoltage?
TPA270 enters a permanent low-impedance short-circuit state when triggered, diverting fault current until upstream protection (e.g., fuse or circuit breaker) clears the fault. This prevents open-circuit failure and ensures downstream circuitry remains isolated from hazardous voltages-verified per UL497B E136224 certification.
Can TPA270 be used in AC mains protection applications?
No-TPA270 is rated for telecom signal-line protection only, with max VRM = 243 V and no isolation rating for 120/230 VAC mains. Its design targets low-capacitance, fast-response clamping on twisted-pair telecom interfaces-not high-energy AC line surge suppression.
How does TPA270 differ from standard TVS diodes in telecom protection?
Unlike unidirectional TVS diodes, TPA270 provides symmetric bidirectional clamping without polarity constraints and maintains stable VBO over temperature (±10% from –40°C to +125°C). Its thyristor-based crowbar action delivers lower clamping voltage under high-current surges than avalanche diodes, with inherent fail-safe shorting.
What is the minimum series resistance required for FCC Part 68 compliance?
For FCC Part 68 lightning surge Type A (1500 V, 10/160 µs), TPA270 requires a minimum 12.5 Ω series resistor to limit let-through energy and meet specification limits. This value is derived from Table 1 in the ST datasheet and validated in functional test circuits per Figure 11.
TPA270 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TPA, TRISIL™
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
TPA270 FAQ
1.How can I place an order for TPA270 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPA270 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 TPA270 reliable?
The price and inventory of TPA270 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPA270 is usually 5 days.
3.What payment methods are accepted for TPA270?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPA270 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPA270?
TPA270 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPA270 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 TPA270?
For technical support, including TPA270 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPA270 requirements.
6.How does Aetrix verify that TPA270 is sourced from the original manufacturer or authorized distributors?
All TPA270 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 TPA270 meets industry standards.
7.What is the process for return or replacement of TPA270?
All TPA270 units undergo pre-shipment inspection (PSI). If there is an issue with TPA270, 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 TPA270 part is unused and in its original packaging.
Return procedure for TPA270:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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