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STMicroelectronics SMP50-68
- Part No.:
- SMP50-68
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP50-68.pdf
- Description:
- THYRISTOR 68V 150A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
SMP50-68 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage crowbar clamping on telecom line interfaces. It features a 68 V stand-off voltage (VRM), 93 V dynamic breakover voltage (VBO), 20 pF capacitance at 50 V, ≤2 µA leakage current, and 50 A repetitive peak pulse current (10/1000 µs). It is used in xDSL line cards to suppress lightning-induced transients while maintaining signal integrity.
For engineers reviewing the SMP50-68 datasheet, SMP50-68 pinout, SMP50-68 application, or SMP50-68 equivalent, key selection criteria include its fail-safe short-circuit mode, UL497B and GR-1089 compliance, low capacitance for high-speed lines, and SMA package thermal performance under sustained surge stress.
Technical Context
The SMP50-68 operates as a voltage-triggered bidirectional thyristor that latches into low-impedance conduction once VBO is exceeded, providing robust crowbar protection without degradation over time. Its holding current (IH ≥ 800 mA) ensures reliable stay-on behavior during surge decay, and its fail-safe short-circuit mode meets UL1459 and FCC Part 68 requirements.
Designed specifically for telecom line interface protection, it supports GR-1089 Core first-level (2500 V, 10/1000 µs, 500 A) and ITU-T K20/K21 (6000 V, 10/700 µs) surge immunity when paired with appropriate series impedance. Thermal resistance Rth(j-a) = 120 °C/W (SMA) enables stable operation under repeated 50 A pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 68 V - Maximum continuous reverse voltage before triggering; sets minimum line operating margin for 48 V DC telecom systems. |
| Dynamic Breakover Voltage (VBO) | 93 V - Voltage at which device triggers under 100 V/µs dV/dt; defines clamping threshold during fast transients. |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - Sustained surge handling capability; validates compliance with GR-1089 first-level testing. |
| Junction Capacitance (C) | 20 pF @ 50 V - Low parasitic capacitance preserves signal integrity on ADSL/ISDN lines up to 2.2 MHz. |
| Holding Current (IH) | ≥800 mA - Minimum current required to maintain conduction; ensures latch-on during full surge decay without premature recovery. |
| Leakage Current (IRM) | ≤2 µA @ 68 V - Negligible standby power loss and minimal impact on line bias stability. |
| Package | SMA (DO-214AC) - JEDEC-registered surface-mount package with 120 °C/W junction-to-ambient thermal resistance. |
Pinout & Package
SMP50-68 is housed in an SMA (DO-214AC) package with cathode-anode bidirectional terminals. The compact 2.25–2.90 mm × 4.80–5.35 mm outline supports automated placement and provides adequate creepage for telecom isolation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Primary surge current entry point (bidirectional) | Connects to protected line; conducts during positive or negative overvoltage events. |
| Cathode (K) | Primary surge current exit point (bidirectional) | Connects to ground or return path; completes crowbar loop during both polarity surges. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Clamps symmetrically on ± transients without polarity-sensitive external circuitry. |
| Fail-safe short-circuit mode | Guarantees permanent low-impedance path upon end-of-life failure, preventing open-circuit vulnerability. |
| UL497B certification (E136224) | Validated for primary protection in FCC Part 68-compliant telecom terminal equipment. |
| UL94 V0 epoxy encapsulation | Self-extinguishing housing meets flammability safety requirements for enclosed telecom chassis. |
| No aging under repeated surges | Maintains consistent VBO and IH over >10⁵ surge events-no parameter drift or wear-out mechanism. |
Applications
| ADSL Line Card Protection | ISDN BRI Interface |
|---|---|
Use Scenario: Protects copper pair inputs of DSLAM line cards against lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Primary crowbar protector placed upstream of line driver/receiver ICs; triggers within nanoseconds to clamp transients below 100 V. Use Value: Enables GR-1089 Core first-level compliance with only a 20 Ω series resistor, minimizing insertion loss and preserving SNR. | Use Scenario: Shields ISDN basic rate interface (BRI) U-interface circuits in NT1 devices from induced surges on 2-wire local loops. IC Role / Device Role / Timing Role: Bidirectional voltage-triggered thyristor acting as self-resetting fuse; holds conduction until line current drops below 800 mA. Use Value: Eliminates need for resettable fuses or gas discharge tubes, reducing BOM count and board space by 30%. |
| Fax/Modem Terminal Port | Central Office Line Card |
Use Scenario: Integrated into RJ-11 port protection circuits of analog fax machines and dial-up modems. IC Role / Device Role / Timing Role: Standby-mode protector with <2 µA leakage; triggers at 93 V to shunt 50 A surges away from sensitive codec ICs. Use Value: Meets UL1459 and FCC Part 68 Type A lightning surge requirements without derating at elevated ambient temperatures. | Use Scenario: Used in carrier-grade central office line cards for T1/E1 and POTS distribution frames. IC Role / Device Role / Timing Role: First-stage transient voltage suppressor in multi-stage protection networks; coordinates with downstream TVS diodes. Use Value: Provides fail-safe short-circuit behavior ensuring continued protection even after catastrophic surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPA68 | Same electrical specs but in DO-15 through-hole package; Rth(j-a) = 100 °C/W; higher thermal mass. | Preferred for prototyping or legacy through-hole designs; less suitable for high-density telecom PCBs. | Select TPA68 only when manual assembly or mechanical robustness outweighs board space constraints. |
| SMTPA68 | Identical parameters in SMB (DO-214AA) package; Rth(j-a) = 100 °C/W; 0.11 g weight vs. SMA's 0.068 g. | Better thermal performance than SMA for sustained surge duty cycles; larger footprint requires layout adjustment. | Choose SMTPA68 when thermal dissipation under repeated surges is critical and PCB area permits SMB footprint. |
Compared with TPA68 and SMTPA68, SMP50-68 offers the smallest PCB footprint and lowest weight among the 68 V Trisil variants, making it optimal for space-constrained DSLAM modules where thermal cycling reliability and automated assembly yield are prioritized.
Availability
SMP50-68 is available at Aetrix Electronics and suitable for ADSL line cards, ISDN terminal equipment, fax/modem ports, and central office line cards requiring stable component supply across extended production lifecycles.
Supply support for SMP50-68 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, microcontroller, power, and protection devices for industrial, automotive, and communications markets.
The Trisil™ product line was developed specifically for fail-safe, maintenance-free overvoltage protection in telecom infrastructure-addressing GR-1089, ITU-T K-series, and FCC Part 68 compliance without aging or parameter drift.
FAQ
What is the fail-safe behavior of SMP50-68 during end-of-life failure?
SMP50-68 fails short-circuit, maintaining a low-impedance path between anode and cathode. This ensures continued crowbar protection even after repeated surge exposure, eliminating open-circuit risk that could leave downstream circuitry unprotected. UL497B certification confirms this behavior under standardized stress tests.
Can SMP50-68 be used in AC-powered telecom equipment?
Yes-SMP50-68 is bidirectional and rated for AC line transients. Its 93 V dynamic breakover voltage and 50 A 10/1000 µs rating support protection of AC-coupled interfaces such as POTS line cards and ISDN U-interfaces. It must be used with a series current-limiting resistor sized per GR-1089 or ITU-T K20 requirements.
How does SMP50-68 differ from standard TVS diodes in telecom protection?
Unlike avalanche diodes, SMP50-68 is a thyristor-based crowbar device with latching behavior and fail-safe shorting. It offers lower clamping voltage under high-current surges, no wear-out mechanism, and inherent coordination with series resistors for GR-1089 compliance-whereas TVS diodes exhibit voltage rise with current and degrade after repeated surges.
Is SMP50-68 RoHS and REACH compliant?
Yes-SMP50-68 is manufactured in STMicroelectronics' ECOPACK®-compliant process with lead-free second-level interconnects. The inner box label and package marking indicate RoHS status per JEDEC JESD97, and full REACH SVHC declarations are available via ST's product change notifications portal.
SMP50-68 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 90V
- Voltage - Off State:
- 68V
- 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:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMP50-68 FAQ
1.How can I place an order for SMP50-68 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP50-68 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 SMP50-68 reliable?
The price and inventory of SMP50-68 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP50-68 is usually 5 days.
3.What payment methods are accepted for SMP50-68?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP50-68 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP50-68?
SMP50-68 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP50-68 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 SMP50-68?
For technical support, including SMP50-68 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP50-68 requirements.
6.How does Aetrix verify that SMP50-68 is sourced from the original manufacturer or authorized distributors?
All SMP50-68 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 SMP50-68 meets industry standards.
7.What is the process for return or replacement of SMP50-68?
All SMP50-68 units undergo pre-shipment inspection (PSI). If there is an issue with SMP50-68, 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 SMP50-68 part is unused and in its original packaging.
Return procedure for SMP50-68:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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