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STMicroelectronics TPA270RL
- Part No.:
- TPA270RL
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
TPA270RL.pdf
- Description:
- THYRISTOR 270V 150A DO-204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,712
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Product details
Overview
TPA270RL from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device in DO-15 package, designed for primary overvoltage crowbar protection on telecom line interfaces. It features 270 V stand-off voltage (VRM), 350 V dynamic breakover voltage (VBO), 12 mA minimum holding current (IH), 50 A repetitive peak pulse current (10/1000 µs), and 25 pF capacitance at 50 V - enabling robust lightning surge suppression in analog/digital xDSL and T1/E1 line cards.
For engineers reviewing the TPA270RL datasheet, TPA270RL pinout, TPA270RL application, or TPA270RL equivalent, this device is selected for fail-safe short-circuit clamping in GR-1089 Core Level 1/2, ITU-T K20/K21, and FCC Part 68-compliant telecom front-end protection where low capacitance, stable VBO, and high IPP are critical to maintain signal integrity under 2.5 kA fail-safe fault current.
Technical Context
The TPA270RL operates as a voltage-triggered bidirectional thyristor, entering low-impedance conduction when transient voltage exceeds its dynamic breakover threshold (350 V typical). Its fail-safe short-circuit mode ensures equipment remains protected even after multiple surges, with no degradation or aging effects.
It is rated for 2500 V peak surge (GR-1089 Core First Level) and 6000 V (ITU-T K20), requiring only a 12.5 Ω series resistor for FCC Part 68 Type A compliance. Thermal resistance junction-to-ambient is 100 °C/W with recommended DO-15 footprint, supporting sustained operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 270 V - maximum continuous reverse voltage before triggering; defines operating margin below breakover |
| Dynamic Breakover Voltage (VBO) | 350 V typ. @ 100 V/µs - actual turn-on threshold under fast-rising transients; ensures reliable clamping before downstream IC damage |
| Holding Current (IH) | 12 mA min - minimum current required to sustain conduction; guarantees latching during surge decay without premature dropout |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - withstands repeated lightning-induced surges per GR-1089 and ITU-T standards |
| Capacitance (C) | 25 pF @ 50 V - low parasitic loading preserves high-frequency signal integrity on xDSL/T1 lines |
| Leakage Current (IRM) | 2 µA max @ 243 V - minimal DC loading on protected line; avoids false triggers or bias shift in analog circuits |
| Fail-Safe Current (IFS) | 2.5 kA @ 8/20 µs - guaranteed short-circuit behavior under catastrophic overstress; enables safe system-level fault containment |
Pinout & Package
TPA270RL is housed in a DO-15 axial-leaded package (JEDEC DO-15, dimensions: A = 6.05–6.75 mm, B = 2.95–3.53 mm, C = 26–31 mm, D = 0.71–0.88 mm), with two terminals: Anode (A) and Cathode (K). The device is bidirectional - either terminal may serve as anode or cathode depending on polarity of applied surge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point (positive half-cycle) | Connects to line side; forms low-impedance path to ground when VAK > VBO |
| Cathode (K) | Surge current entry point (negative half-cycle) | Connects to line side; forms low-impedance path to ground when VKA > VBO |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Clamps both positive and negative transients without external polarity configuration; simplifies PCB layout for AC-coupled telecom lines |
| UL497B certified (E136224) | Validated for primary-side surge protection in FCC Part 68 and UL1459-compliant telephony equipment |
| UL94 V0 epoxy encapsulation | Self-extinguishing housing meets flammability requirements for enclosed telecom chassis and central office installations |
| No parameter drift over lifetime | Trisil technology avoids aging-related leakage rise or VBO shift - eliminates recalibration or replacement cycles in field-deployed systems |
| JEDEC DO-15 mechanical standardization | Ensures compatibility with automated axial insertion equipment and legacy telecom board assembly processes |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting ADSL/VDSL line interface circuitry from induced lightning surges on outside plant copper pairs. IC Role / Device Role / Timing Role: Primary crowbar protector placed between line transformer secondary and codec input, clamping transients before they reach sensitive analog front-end. Use Value: 25 pF capacitance minimizes high-frequency attenuation on up to 30 MHz VDSL2 signals; 50 A IPP handles repeated 10/1000 µs surges per GR-1089 Core Level 1. | Use Scenario: Safeguarding T1/E1 framer and line driver ICs in channel bank or CSU/DSU equipment exposed to power cross events. IC Role / Device Role / Timing Role: Fail-safe shunt element across differential pair, triggered by >350 V common-mode transients to divert energy to ground via series resistor. Use Value: 12 mA IH ensures latching through full 1000 µs surge tail; UL497B certification validates compliance with Telcordia GR-1089 Section 4.5.2.2. |
| Central Office Terminal Protection | Fax/Modem Analog Port Protection |
Use Scenario: Front-end surge hardening of analog voice ports in Class 5 switches or remote terminal units. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on tip/ring lines, coordinated with gas discharge tube (GDT) for multi-stage protection. Use Value: 270 V VRM provides 15% margin above 240 VAC RMS line voltage; DO-15 package supports high-reliability through-hole mounting in vibration-prone CO environments. | Use Scenario: Integrated surge immunity for consumer-grade fax machines and analog modems connected to PSTN lines. IC Role / Device Role / Timing Role: Standalone primary protector on line interface, directly soldered between RJ11 jack and isolation transformer. Use Value: 2 µA IRM prevents DC loading that could disrupt ring detection or off-hook sensing; UL94 V0 resin satisfies end-product fire safety requirements. |
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 |
|---|---|---|---|
| TPA240RL | Lower VRM (240 V) and VBO (300 V); identical DO-15 package and 50 A IPP rating | Better suited for 176 VAC nominal systems (e.g., Japanese POTS) where tighter voltage margin is acceptable | Select when system operating voltage is ≤220 V and lower clamping threshold improves margin against 4 kV IEC61000-4-5 surges |
| SMTPA270 | SMB surface-mount package (DO-214AA); same 270 V VRM, 360 V static VBO, 12 mA IH, and 50 A IPP | Enables automated SMT assembly and higher board density; thermal resistance junction-to-ambient is 100 °C/W (vs. 100 °C/W for DO-15) | Choose for new designs prioritizing production efficiency and space-constrained telecom modules |
Compared with TPA240RL, TPA270RL offers higher voltage margin for 240 VAC systems and improved immunity to slow-rising transients; versus SMTPA270, it trades SMT scalability for through-hole mechanical robustness and legacy repairability in central office hardware.
Availability
TPA270RL is available at Aetrix Electronics and suitable for DSL line card protection, T1/E1 interface hardening, and central office terminal surge suppression requiring stable component supply across long-lifecycle telecom deployments.
Supply support for TPA270RL 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 silicon solutions for automotive, industrial, and communications markets since 1987.
The Trisil™ product line was developed specifically for fail-safe, maintenance-free overvoltage protection in telecom infrastructure - emphasizing reliability under repeated lightning stress, regulatory compliance (UL497B, GR-1089), and long-term parameter stability.
FAQ
What is the fail-safe behavior of TPA270RL under catastrophic overvoltage?
Under extreme overstress exceeding its 2.5 kA fail-safe rating (8/20 µs), TPA270RL enters a permanent low-resistance short-circuit state - safely shunting all subsequent current to ground without open-circuit failure or fire hazard. This behavior is inherent to Trisil thyristor physics and validated per UL497B File E136224.
Can TPA270RL be used without a series current-limiting resistor?
No - a series resistor is mandatory to limit follow current after triggering. For FCC Part 68 Type A compliance, a 12.5 Ω resistor is required; for GR-1089 Core Level 1 (2500 V, 10/1000 µs), minimum 20 Ω is needed. Omitting the resistor risks destructive latch-up or excessive power dissipation in the device.
How does TPA270RL's 25 pF capacitance impact high-speed DSL performance?
At 25 pF measured at 50 V bias and 1 MHz, TPA270RL introduces negligible insertion loss below 30 MHz - preserving signal integrity for VDSL2 (up to 30 MHz) and G.fast (up to 212 MHz) when placed after the line transformer. Its capacitance remains stable across reverse voltage (0–50 V), avoiding distortion in AC-coupled voice/data paths.
Is TPA270RL compatible with lead-free reflow soldering processes?
Yes - TPA270RL is supplied in ECOPACK®-compliant DO-15 packaging with lead-free second-level interconnect. It supports JEDEC J-STD-020D-defined reflow profiles, including peak temperatures up to 260 °C for 10 seconds, as specified in ST's official package documentation.
TPA270RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TPA, TRISIL™
- Packaging:
- Tape & Reel (TR)
- 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)
TPA270RL FAQ
1.How can I place an order for TPA270RL through Aetrix?
Please submit a Request for Quotation (RFQ) for TPA270RL 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 TPA270RL reliable?
The price and inventory of TPA270RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPA270RL is usually 5 days.
3.What payment methods are accepted for TPA270RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPA270RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPA270RL?
TPA270RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPA270RL 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 TPA270RL?
For technical support, including TPA270RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPA270RL requirements.
6.How does Aetrix verify that TPA270RL is sourced from the original manufacturer or authorized distributors?
All TPA270RL 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 TPA270RL meets industry standards.
7.What is the process for return or replacement of TPA270RL?
All TPA270RL units undergo pre-shipment inspection (PSI). If there is an issue with TPA270RL, 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 TPA270RL part is unused and in its original packaging.
Return procedure for TPA270RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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