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STMicroelectronics SMP80MC-120
- Part No.:
- SMP80MC-120
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMP80MC-120.pdf
- Description:
- THYRISTOR 120V 200A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,621
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Product details
Overview
SMP80MC-120 from STMicroelectronics is a bidirectional Trisil™ transient voltage surge suppressor (TVSS) designed for primary-level overvoltage protection in telecom line interfaces. It provides crowbar action at 120 V stand-off voltage, supports 80 A repetitive peak pulse current (10/1000 µs), exhibits micro capacitance of 12 pF at 50 V, and maintains low leakage current (≤2 µA). It is used in ADSL2+/fax/modem terminal protection against lightning-induced surges.
For engineers reviewing the SMP80MC-120 datasheet, SMP80MC-120 pinout, SMP80MC-120 application, or SMP80MC-120 equivalent, key selection criteria include breakover voltage stability across temperature, fail-safe short-circuit behavior under overstress, low signal distortion due to sub-15 pF capacitance, and compliance with GR-1089 Core, ITU-T K20/K21, and IEC 61000-4-5 surge immunity standards.
Technical Context
The SMP80MC-120 operates as a voltage-triggered bidirectional thyristor-based crowbar device, entering low-impedance conduction when transient voltage exceeds its dynamic breakover threshold (155 V typical). Its fail-safe mode ensures permanent short-circuit behavior upon end-of-life overstress, eliminating open-circuit failure risk.
Thermal design relies on JEDEC DO-214AA (SMB) package with Rth(j-a) = 100 °C/W (recommended footprint) and Rth(j-l) = 20 °C/W. It sustains 8/20 µs surges up to 200 A and 2/10 µs pulses up to 250 A, with holding current ≥150 mA ensuring reliable latching during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 120 V - Maximum continuous operating voltage before triggering; defines maximum nominal line voltage it can protect without false trip. |
| Dynamic Breakover Voltage (VBO) | 155 V typ. - Voltage at which crowbar conduction initiates under 100 V/µs dV/dt; ensures fast response to steep transients. |
| Repetitive Peak Pulse Current (IPP) | 80 A @ 10/1000 µs - Sustained surge handling capability per event; meets GR-1089 first-level requirements. |
| Junction Capacitance (C) | 12 pF @ 50 V - Minimal signal loading; preserves high-frequency integrity for ADSL2+ (up to 2.2 MHz) and VDSL2. |
| Holding Current (IH) | 150 mA min. - Minimum current required to maintain conduction; ensures robust latching during multi-cycle surges. |
| Leakage Current (IR) | 2 µA max. @ VRM - Negligible DC loading on protected line; avoids interference with line supervision or phantom power. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 5.1–5.6 mm body width; compatible with automated assembly and IPC-7351B footprints. |
Pinout & Package
Package: JEDEC DO-214AA (SMB), epoxy-molded, lead-free, UL94 V0 rated. Cathode bar marking indicates polarity for unidirectional variants; SMP80MC-120 is bidirectional and marked "TP12".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry terminal (positive half-cycle) | One of two symmetrical terminals; conducts when voltage across A–K exceeds VBO in either polarity. |
| Cathode (K) | Current exit terminal (negative half-cycle) | Second symmetrical terminal; forms bidirectional crowbar path with Anode; no fixed polarity reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar protection | Enables single-device protection of AC-coupled telecom lines (e.g., POTS, xDSL) without polarity sensitivity or external diodes. |
| Low VBO / VRM ratio (1.29) | Ensures tight clamping margin-only 35 V above stand-off-reducing stress on downstream components like line interface ICs. |
| Micro capacitance (12 pF) | Preserves signal fidelity up to 30 MHz; avoids insertion loss or phase distortion in broadband DSL applications. |
| Fail-safe short-circuit mode | Guarantees protection continuity even after end-of-life overstress; eliminates risk of unprotected open-circuit failure. |
| GR-1089 Core & ITU-T K20/K21 compliance | Validated for telecom central office and customer premises equipment requiring Level 1 (2500 V/500 A) and Intra-building (1500 V/100 A) surge immunity. |
Applications
| ADSL2+ Line Interface Protection | Fax/Modem Terminal Protection |
|---|---|
Use Scenario: Protecting copper pair inputs of ADSL2+ line cards against induced lightning surges and power cross events in residential gateways. IC Role / Device Role / Timing Role: Primary crowbar protector placed upstream of line driver/receiver ICs (e.g., LME49710, SLICs); triggers within nanoseconds to clamp transients before downstream damage. Use Value: 12 pF capacitance prevents signal attenuation beyond -0.5 dB at 2.2 MHz, maintaining full ADSL2+ data throughput while surviving 80 A surges. | Use Scenario: Surge suppression on analog telephone line inputs of standalone fax machines and dial-up modems deployed in lightning-prone regions. IC Role / Device Role / Timing Role: Standalone overvoltage guard between RJ11 jack and internal codec/SLAC circuitry; operates independently of system power. Use Value: Fail-safe short-circuit behavior ensures continued protection even after multiple 6 kV ITU-T K20 surges, preventing field returns due to silent open failures. |
| Central Office DSLAM Protection | POTS Line Card Transient Suppression |
Use Scenario: First-stage protection on subscriber line interface modules in carrier-grade DSLAMs handling hundreds of simultaneous lines. IC Role / Device Role / Timing Role: Front-end surge arrestor mounted directly at PCB edge connector; coordinates with secondary TVS and series impedance for GR-1089-compliant staging. Use Value: 80 A (10/1000 µs) rating enables single-device coverage of GR-1089 first-level requirement (500 A @ 2/10 µs via 5 Ω series resistor), reducing BOM count. | Use Scenario: Protecting legacy Plain Old Telephone Service (POTS) line cards in VoIP gateways and PBX systems against accidental 48 V battery cross-connections and induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across tip/ring; withstands continuous -48 V DC bias while blocking transients >120 V. Use Value: ≤2 µA leakage at 120 V ensures no impact on line supervision current thresholds (typically 20–50 mA), preserving call detection reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient surge suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ12CA | Unidirectional TVS diode; 12 V standoff; 1500 W peak power; 100 pF capacitance. | Limited to DC-biased or polarity-defined lines; unsuitable for AC-coupled telecom without external bridge. | Select only for low-speed, unidirectional DC lines where capacitance >100 pF is acceptable. |
| TISP4240M3JR-S | Bidirectional Thyristor Surge Protector; 130 V standoff; 100 A (8/20 µs); 25 pF capacitance. | Higher capacitance degrades >10 MHz signal integrity; lower VBO/VR ratio (1.23) offers tighter clamping. | Prefer for higher-energy surges where 100 A rating is needed, accepting trade-off in high-frequency performance. |
Compared with SMCJ12CA and TISP4240M3JR-S, SMP80MC-120 uniquely balances bidirectional operation, ultra-low 12 pF capacitance, and fail-safe short-circuit behavior-making it optimal for broadband telecom interfaces where signal fidelity and guaranteed protection continuity are both mandatory.
Availability
SMP80MC-120 is available at Aetrix Electronics and suitable for ADSL2+ line cards, fax/modem terminals, central office DSLAMs, and POTS line cards requiring stable component supply with long-term lifecycle support.
Supply support for SMP80MC-120 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, specializing in power management, analog, MEMS, and automotive ICs, with manufacturing in Europe and Asia.
The SMP80MC series belongs to ST's Trisil™ family of thyristor-based surge protectors, engineered specifically for telecom infrastructure requiring fail-safe, low-capacitance, high-reliability overvoltage protection.
FAQ
What is the fail-safe behavior of SMP80MC-120 under end-of-life overstress?
Under catastrophic overstress beyond its I2t rating, SMP80MC-120 enters a permanent low-impedance short-circuit state-guaranteeing continued protection of downstream circuitry. This behavior is inherent to its thyristor structure and is validated per UL497B and GR-1089 requirements.
Can SMP80MC-120 be used in DC-powered telecom equipment?
Yes-it supports continuous reverse voltage up to 120 V and leakage current ≤2 µA at that level, making it suitable for -48 V DC-powered POTS line cards and VoIP gateways. Its bidirectional nature eliminates polarity concerns during installation or fault conditions.
How does SMP80MC-120 achieve compatibility with ADSL2+ signaling?
Its 12 pF junction capacitance at 50 V bias introduces negligible insertion loss (<0.5 dB) up to 2.2 MHz, preserving ADSL2+ spectral efficiency and bit error rate performance. This is confirmed by ST's characterization in Figure 9 and application note AN2447.
What is the recommended PCB footprint for SMP80MC-120?
ST specifies a DO-214AA (SMB) footprint with pad dimensions matching Table 5: 5.1–5.6 mm E width, 4.05–4.60 mm E1 length, and 3.30–3.95 mm D body width. Thermal relief and 35 µm copper thickness are required to achieve the rated Rth(j-a) = 100 °C/W.
SMP80MC-120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Breakover:
- 155V
- Voltage - Off State:
- 120V
- Voltage - On State:
- -
- Current - Peak Pulse (8/20µs):
- 200 A
- Current - Peak Pulse (10/1000µs):
- 80 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 25pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMP80MC-120 FAQ
1.How can I place an order for SMP80MC-120 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP80MC-120 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 SMP80MC-120 reliable?
The price and inventory of SMP80MC-120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP80MC-120 is usually 5 days.
3.What payment methods are accepted for SMP80MC-120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP80MC-120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP80MC-120?
SMP80MC-120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP80MC-120 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 SMP80MC-120?
For technical support, including SMP80MC-120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP80MC-120 requirements.
6.How does Aetrix verify that SMP80MC-120 is sourced from the original manufacturer or authorized distributors?
All SMP80MC-120 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 SMP80MC-120 meets industry standards.
7.What is the process for return or replacement of SMP80MC-120?
All SMP80MC-120 units undergo pre-shipment inspection (PSI). If there is an issue with SMP80MC-120, 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 SMP80MC-120 part is unused and in its original packaging.
Return procedure for SMP80MC-120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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