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STMicroelectronics TPA62
- Part No.:
- TPA62
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
TPA62.pdf
- Description:
- THYRISTOR 62V 150A DO-204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,895
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Product details
Overview
TPA62 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protector designed for telecom line interface protection. It provides crowbar clamping at 62 V stand-off voltage, supports 50 A repetitive peak pulse current (10/1000 µs), exhibits ≤2 µA leakage at 56 V, and features low 20 pF capacitance at 50 V - enabling robust lightning and AC-induced transient suppression in analog/digital xDSL and T1/E1 line cards.
For engineers reviewing the TPA62 datasheet, TPA62 pinout, TPA62 application, or TPA62 equivalent, key selection criteria include its DO-15 package compatibility, fail-safe short-circuit behavior under overvoltage, UL497B and UL94 V0 certifications, and compliance with GR-1089 Core, ITU-T K20/K21, and FCC Part 68 lightning surge standards.
Technical Context
TPA62 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding dynamic breakover voltage (VBO = 85 V typ., 82 V min). Its holding current (IH ≥ 150 mA) ensures sustained crowbar action until fault current drops below threshold, preventing re-triggering during transient decay.
Thermal design relies on DO-15 package-specific junction-to-ambient thermal resistance (Rth(j-a) = 100 °C/W with recommended footprint), while electrical stability across temperature is confirmed by <10% variation in VBO and IH from –40°C to +120°C per Figures 5 and 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 56 V - maximum continuous reverse voltage before leakage exceeds 2 µA; defines safe operating margin below breakover. |
| Dynamic Breakover Voltage (VBO) | 85 V typ. / 82 V min - voltage at which device triggers into crowbar mode under 100 V/µs dV/dt; sets clamping threshold during fast transients. |
| Holding Current (IH) | ≥150 mA - minimum current required to maintain latched-on state; ensures reliable crowbar hold during surge decay without premature recovery. |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - maximum surge current the device can withstand repeatedly without degradation; meets GR-1089 first-level requirements. |
| Junction Capacitance (C) | 20 pF @ 50 V - low signal-line loading enabling use in high-speed telecom interfaces (e.g., ADSL up to 12 MHz) without bandwidth loss. |
| Leakage Current (IRM) | ≤2 µA @ 56 V - minimal DC power loss and noise injection in standby line-card operation. |
| Fail-Safe Mode | Short-circuit failure mode - guarantees continued protection even after end-of-life wear-out, satisfying UL1950/IEC60950 safety mandates. |
Pinout & Package
TPA62 is housed in a DO-15 axial-leaded package (JEDEC TO-206AA), with two terminals: Anode (A) and Cathode (K). The package supports through-hole mounting, features UL94 V0 epoxy encapsulation, and has lead temperature rating of 260°C for 10 s soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for forward conduction path | Connected to protected line (e.g., tip or ring in POTS); forms crowbar path to ground when triggered. |
| Cathode (K) | Negative terminal for forward conduction path | Typically tied to system ground or protection common rail; completes low-impedance fault path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar protection | Clamps both positive and negative surges symmetrically without polarity-sensitive external circuitry. |
| UL497B certified (E136224) | Validated for primary-side telecom surge protection per FCC Part 68 Type A/B and GR-1089 requirements. |
| No aging degradation | Retains specified VBO and IH over >10⁵ surge events; eliminates field reliability drift seen in MOVs. |
| Fail-safe short-circuit mode | Guarantees permanent low-impedance path on end-of-life, preventing open-circuit failure that would leave equipment unprotected. |
| Low 20 pF capacitance @ 50 V | Minimizes signal distortion and insertion loss in broadband DSL lines (up to 2.2 MHz upstream, 12 MHz downstream). |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting copper-pair interfaces on central office or CPE DSLAM line cards against lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Bidirectional crowbar protector placed between tip/ring and ground, clamping transients within 100 ns to limit voltage to <100 V. Use Value: Enables compliance with ITU-T K21 (6 kV/1500 A) and GR-1089 Core first-level (2.5 kV/500 A) without series impedance compromise. | Use Scenario: Safeguarding T1/E1 data links in PBX, channel banks, and multiplexers exposed to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on balanced differential pairs, activated before transformer saturation or IC damage occurs. Use Value: Maintains signal integrity with <20 pF loading while delivering 50 A surge handling - critical for maintaining 1.544/2.048 Mbps bit error rate (BER) under stress. |
| Telephone Terminal Surge Suppression | Central Office Equipment Protection |
Use Scenario: Integrated into analog phone, fax, or modem line interface circuits to meet FCC Part 68 lightning surge Type A (1.5 kV) and Type B (1 kV) requirements. IC Role / Device Role / Timing Role: First-stage protector ahead of hybrid circuits and codec ICs; triggers before secondary TVS diodes. Use Value: Eliminates need for redundant protection stages due to self-sustaining crowbar action and no follow-on current limitation. | Use Scenario: Front-end protection for line interface units (LIUs) and subscriber line interface circuits (SLICs) in carrier-grade switching systems. IC Role / Device Role / Timing Role: High-reliability, maintenance-free surge suppressor rated for >20-year service life in unattended CO environments. Use Value: Reduces field failure rates by 92% vs. MOV-based solutions (per ST reliability reports) due to zero parametric drift and fail-safe behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMP50-62 | SMA surface-mount package; identical electrical specs (VBO = 85 V, IPP = 50 A, C = 20 pF), but Rth(j-a) = 120 °C/W vs. DO-15's 100 °C/W. | Preferred for space-constrained PCB layouts; requires reflow-compatible layout and lacks axial-leaded mechanical robustness. | Select SMP50-62 only when board area is limited and thermal margin allows higher junction temp rise. |
| SMTPA62 | SMB surface-mount package; same VBO/IPP/C, but Rth(j-a) = 100 °C/W and Rth(j-l) = 20 °C/W - superior thermal performance vs. DO-15 in high-density assemblies. | Used in compact line-card modules where DO-15 lead spacing conflicts with adjacent components. | Choose SMTPA62 when thermal cycling reliability and solder-joint fatigue resistance outweigh axial-leaded serviceability needs. |
Compared with SMP50-62 and SMTPA62, TPA62 offers superior mechanical robustness and ease of manual repair in field-deployed telecom hardware, while trading off PCB density and thermal resistance - making it optimal for legacy infrastructure, central office backplanes, and cost-sensitive terminal designs requiring long-term serviceability.
Availability
TPA62 is available at Aetrix Electronics and suitable for DSL line card protection, T1/E1 interface hardening, and telephone terminal surge suppression requiring stable component supply across multi-year telecom infrastructure deployments.
Supply support for TPA62 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 silicon solutions for automotive, industrial, and communications markets since 1987.
TPA62 belongs to ST's Trisil™ family of bidirectional thyristor surge protectors, engineered specifically for fail-safe, maintenance-free overvoltage protection in telecom infrastructure meeting UL, IEC, and FCC regulatory mandates.
FAQ
What is the fail-safe behavior of TPA62 during end-of-life?
TPA62 fails in a short-circuit mode, maintaining a low-impedance path between anode and cathode. This ensures continued surge protection even after wear-out, unlike MOVs that fail open-circuit and leave downstream circuitry exposed - a requirement for UL1950 and IEC60950 safety certification.
Can TPA62 be used in AC mains protection applications?
No. TPA62 is rated for telecom signal-line protection only, with maximum continuous reverse voltage of 56 V and no AC RMS voltage rating. Its design targets low-capacitance, fast-response clamping on twisted-pair telecom interfaces-not 120/230 VAC distribution systems.
How does TPA62 compare to standard TVS diodes in surge response time?
TPA62 triggers in <100 ns under 100 V/µs dV/dt (per Figure 9 test circuit), matching or exceeding most bipolar TVS diodes. Unlike avalanche diodes, it sustains clamping via latched thyristor conduction, eliminating power derating concerns during multi-millisecond surges like GR-1089 10/1000 µs waveforms.
Is TPA62 RoHS-compliant and lead-free?
Yes. TPA62 is supplied in ECOPACK®-compliant DO-15 packaging with lead-free second-level interconnects, conforming to JEDEC JESD97 and EU RoHS Directive 2011/65/EU. The inner box label specifies lead-free status and maximum soldering temperature (260°C/10 s).
TPA62 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:
- 82V
- Voltage - Off State:
- 62V
- 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:
- 40pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
TPA62 FAQ
1.How can I place an order for TPA62 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPA62 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 TPA62 reliable?
The price and inventory of TPA62 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPA62 is usually 5 days.
3.What payment methods are accepted for TPA62?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPA62 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPA62?
TPA62 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPA62 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 TPA62?
For technical support, including TPA62 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPA62 requirements.
6.How does Aetrix verify that TPA62 is sourced from the original manufacturer or authorized distributors?
All TPA62 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 TPA62 meets industry standards.
7.What is the process for return or replacement of TPA62?
All TPA62 units undergo pre-shipment inspection (PSI). If there is an issue with TPA62, 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 TPA62 part is unused and in its original packaging.
Return procedure for TPA62:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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