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STMicroelectronics SMTPA100
- Part No.:
- SMTPA100
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMTPA100.pdf
- Description:
- THYRISTOR 100V 150A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,334
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Product details
Overview
SMTPA100 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protector designed for telecom line interface protection. It features 100 V standoff voltage (VRM), 135 V dynamic breakover voltage (VBO), 16 mA minimum holding current (IH), 50 A repetitive peak pulse current (10/1000 µs), and 35 pF typical capacitance at 2 V bias - enabling robust lightning and transient suppression in xDSL and T1/E1 line cards.
For engineers reviewing the SMTPA100 datasheet, SMTPA100 pinout, SMTPA100 application, or SMTPA100 equivalent, this device is selected for telecom-grade fail-safe crowbar protection where low capacitance, stable breakover threshold, and UL497B/GR-1089 compliance are mandatory in analog/digital subscriber line interfaces.
Technical Context
SMTPA100 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction upon exceeding its dynamic breakover voltage (135 V), sustaining conduction until current falls below 16 mA holding current. Its fail-safe short-circuit mode ensures equipment remains protected even after multiple surges.
Designed for telecom primary protection, it meets GR-1089 Core (first/second level), ITU-T K20/K21, IEC61000-4-5, and FCC Part 68 lightning surge requirements with validated performance up to 50 A (10/1000 µs) and thermal robustness (Rth(j-l) = 20 °C/W in SMB package).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 100 V - maximum continuous reverse voltage before triggering; sets operating margin above line voltage in -48 V telecom systems. |
| Dynamic Breakover Voltage (VBO) | 135 V - voltage at which device triggers under fast-rising transients (100 V/µs); defines clamping threshold for lightning surges. |
| Holding Current (IH) | 16 mA min - minimum current required to maintain conduction; ensures reliable latch-off during normal line idle conditions. |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - surge current handling capacity per GR-1089 first-level testing; supports repeated lightning strike events. |
| Junction Capacitance (C) | 35 pF @ 2 V - low signal distortion on high-speed lines (e.g., xDSL up to 12 MHz); avoids attenuation of data signals. |
| Leakage Current (IRM) | 2 µA max @ 100 V - negligible DC loading on protected line; prevents false triggering or power loss in standby. |
| Package | SMB (DO-214AA) - JEDEC-registered surface-mount outline with 20 °C/W junction-to-leads thermal resistance for PCB heat dissipation. |
Pinout & Package
SMTPA100 is housed in an SMB (DO-214AA) plastic package 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. No gate control - fully passive crowbar operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point (positive half-cycle) | Connects to line side of telecom interface; conducts surge energy toward ground when VAK > +135 V. |
| Cathode (K) | Surge current entry point (negative half-cycle) | Connects to line side; conducts surge energy toward ground when VKA > +135 V - enables symmetrical bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Self-triggering conduction for both polarities without external circuitry - eliminates need for back-to-back diodes or complex driver ICs. |
| Fail-safe short-circuit mode | Latches permanently low-impedance upon end-of-life surge; prevents open-circuit failure that would leave downstream circuitry unprotected. |
| UL497B certification (E136224) | Validated for primary protection in telecom interfaces meeting FCC Part 68, GR-1089, and ITU-T K20/K21 standards. |
| UL94 V0 epoxy encapsulation | Flame-retardant housing withstands sustained fault currents without ignition - critical for central office and CPE safety compliance. |
| JEDEC DO-214AA footprint | Standardized SMB land pattern enables drop-in replacement and automated assembly compatibility across telecom BOMs. |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting copper-pair interfaces on DSLAM line cards against induced lightning surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary crowbar protector placed between tip/ring and ground, upstream of line transformer and codec. Use Value: 35 pF capacitance preserves ADSL2+ bandwidth; 50 A surge rating meets GR-1089 first-level requirements without derating. | Use Scenario: Safeguarding T1/E1 framer circuits in enterprise PBX and transport equipment from longitudinal surges on balanced pairs. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on each differential pair, referenced to chassis ground via series resistor network. Use Value: 135 V VBO provides 35 V margin above ±130 V common-mode limits; fail-safe mode prevents service interruption during surge fatigue. |
| VoIP Gateway Protection | Central Office Line Card |
Use Scenario: Shielding FXS/FXO ports in VoIP gateways from lightning-induced transients on POTS lines. IC Role / Device Role / Timing Role: First-stage protector before hybrid transformer and SLIC, absorbing >90% of 10/1000 µs surge energy. Use Value: 16 mA IH ensures clean turn-off during ring detection (20–50 mA loop current); UL497B approval satisfies FCC Part 68 certification. | Use Scenario: Primary protection on digital line cards in Class 5 switches handling thousands of subscriber lines. IC Role / Device Role / Timing Role: Telecom-grade crowbar element mounted directly on line card edge connector, paired with PTC resettable fuse. Use Value: SMB package allows high-density placement; 20 °C/W Rth(j-l) enables thermal management under repeated surge duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom crowbar protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPA100 | Same electrical specs (100 V VRM, 135 V VBO, 16 mA IH), but in DO-15 through-hole package. | Requires wave soldering and larger PCB area; preferred for legacy telecom hardware or prototyping boards. | Select TPA100 only when through-hole assembly or higher single-pulse I²t (6.5 A²s) is required over SMB's 6.2 A²s. |
| SMTPA120 | Higher 120 V VRM and 160 V VBO; otherwise identical SMB footprint, capacitance (30 pF), and IPP (50 A). | Suitable for +24 V or -72 V systems requiring wider voltage margin; not recommended for standard -48 V lines due to elevated trigger threshold. | Choose SMTPA120 only if system nominal voltage exceeds 48 V or if design requires >20 V headroom above VRM. |
Compared with TPA100, SMTPA100 offers surface-mount scalability and automated assembly; compared with SMTPA120, it delivers tighter voltage matching for -48 V telecom infrastructure, ensuring earlier clamping and lower let-through energy during fast-rising transients.
Availability
SMTPA100 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interfaces, VoIP gateways, and central office equipment requiring stable component supply, long-term lifecycle support, and certified telecom surge protection.
Supply support for SMTPA100 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.
SMTPA100 belongs to ST's Trisil™ family of bidirectional thyristor surge protectors, engineered specifically for fail-safe primary protection in telecom infrastructure meeting GR-1089, ITU-T K20/K21, and FCC Part 68 standards.
FAQ
What is the fail-safe behavior of SMTPA100 during end-of-life surge events?
SMTPA100 fails short-circuit - maintaining low-impedance conduction after exceeding its I²t rating. This ensures downstream circuitry remains protected even after catastrophic surge exposure, unlike varistors or TVS diodes that may fail open and leave equipment vulnerable. UL497B validation confirms this behavior under standardized test conditions.
Can SMTPA100 be used without a series current-limiting resistor?
No - a series resistor (typically 10–100 Ω) is mandatory to limit follow current after triggering and prevent destructive latch-on during AC power cross-talk. The resistor value must be chosen to ensure steady-state current stays below 16 mA IH during normal operation while allowing sufficient surge current to trigger the device within microseconds.
How does SMTPA100 compare to MOV-based protection in telecom applications?
Unlike MOVs, SMTPA100 exhibits no aging or parameter drift after repeated surges, maintains precise 135 V VBO tolerance over temperature, and offers lower capacitance (35 pF vs. >100 pF for MOVs), preserving high-frequency signal integrity on xDSL lines. Its thyristor structure also provides faster response (<100 ns) than typical MOVs (500 ns–1 µs).
Is SMTPA100 compatible with lead-free reflow soldering processes?
Yes - SMTPA100 is supplied in ECOPACK®-compliant SMB packages with lead-free second-level interconnects. It supports JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260 °C for 10 seconds, and is marked with appropriate RoHS and lead-free indicators on packaging and device body.
SMTPA100 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 133V
- Voltage - Off State:
- 100V
- 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:
- 35pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMTPA100 FAQ
1.How can I place an order for SMTPA100 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMTPA100 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 SMTPA100 reliable?
The price and inventory of SMTPA100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMTPA100 is usually 5 days.
3.What payment methods are accepted for SMTPA100?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMTPA100 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMTPA100?
SMTPA100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMTPA100 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 SMTPA100?
For technical support, including SMTPA100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMTPA100 requirements.
6.How does Aetrix verify that SMTPA100 is sourced from the original manufacturer or authorized distributors?
All SMTPA100 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 SMTPA100 meets industry standards.
7.What is the process for return or replacement of SMTPA100?
All SMTPA100 units undergo pre-shipment inspection (PSI). If there is an issue with SMTPA100, 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 SMTPA100 part is unused and in its original packaging.
Return procedure for SMTPA100:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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