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STMicroelectronics SMP50-62
- Part No.:
- SMP50-62
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMP50-62.pdf
- Description:
- THYRISTOR 62V 150A DO-214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
SMP50-62 from STMicroelectronics is a bidirectional Trisil™ thyristor surge protection device designed for primary overvoltage crowbar clamping on telecom line interfaces. It features 62 V stand-off voltage (VRM), 85 V dynamic breakover voltage (VBO), 50 A repetitive peak pulse current (10/1000 µs), and 12–20 pF capacitance at 50 V - enabling low-distortion protection of xDSL, T1/E1, and ISDN line cards without signal integrity degradation.
For engineers reviewing the SMP50-62 datasheet, SMP50-62 pinout, SMP50-62 application, or SMP50-62 equivalent, key selection criteria include its fail-safe short-circuit mode under surge, UL497B and GR-1089 compliance, JEDEC DO-214AC (SMA) package thermal performance, and suitability for FCC Part 68 Type A lightning surge protection with ≥20 Ω series resistance.
Technical Context
The SMP50-62 operates as a voltage-triggered bidirectional thyristor, latching into low-impedance conduction once VBO is exceeded and maintaining conduction until current falls below 150 mA holding current (IH). Its fail-safe short-circuit behavior ensures equipment remains protected even after device activation.
Designed specifically for telecom line-side transient suppression, it meets ITU-T K20/K21 (6 kV/10/700 µs), GR-1089 Core (2.5–5 kV), and FCC Part 68 lightning surge requirements when used with appropriate series impedance - leveraging low 2 µA max leakage and stable VBO across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 62 V - maximum continuous reverse voltage before triggering; sets minimum line operating margin for analog/digital telecom interfaces. |
| Dynamic Breakover Voltage (VBO) | 85 V - voltage at which device triggers under 100 V/µs dV/dt; defines clamping onset threshold during fast transients. |
| Repetitive Peak Pulse Current (IPP) | 50 A @ 10/1000 µs - maximum surge current the device can survive repeatedly; validates robustness against GR-1089 first-level surges. |
| Holding Current (IH) | 150 mA min - minimum current required to sustain conduction; ensures reliable latch-on during sustained overvoltage events. |
| Capacitance (C) | 20 pF max @ 50 V, 1 MHz - low parasitic capacitance preserves high-frequency signal integrity on xDSL and ISDN lines. |
| Leakage Current (IRM) | 2 µA max @ VRM - ultra-low off-state leakage prevents DC loading or false triggering in high-impedance line circuits. |
Pinout & Package
SMP50-62 is housed in an SMA package (JEDEC DO-214AC), featuring a two-terminal surface-mount configuration optimized for PCB-level telecom surge protection with 120 °C/W junction-to-ambient thermal resistance using recommended footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry terminal during positive half-cycle conduction | Connected to line side of series impedance; forms bidirectional crowbar path with Cathode. |
| Cathode (K) | Current exit terminal during positive half-cycle conduction | Connected to ground or reference plane; completes low-impedance fault path during surge event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Clamps both polarities of transient without external polarity control - simplifies protection design for AC-coupled telecom lines. |
| Fail-safe short-circuit mode | Guarantees permanent low-resistance path after activation - prevents latent failure and supports UL94 V0 resin safety compliance. |
| UL497B certification (E136224) | Validated for primary-side telecom surge protection per FCC Part 68 - eliminates need for additional system-level certification effort. |
| JEDEC DO-214AC (SMA) package | Standardized footprint with 120 °C/W Rth(j-a) - enables predictable thermal design and compatibility with automated SMT assembly. |
Applications
| DSL Line Card Protection | T1/E1 Interface Protection |
|---|---|
Use Scenario: Protecting ADSL/VDSL line interface circuitry from induced lightning surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Primary crowbar clamping device placed between line transformer secondary and codec IC input. Use Value: Limits surge voltage to ≤85 V while passing 50 A pulses, preserving codec reliability and meeting GR-1089 Core Level 1 requirements. | Use Scenario: Safeguarding T1/E1 framer and line driver ICs in central office and CPE equipment against power cross and lightning events. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on balanced differential line inputs prior to transformer coupling. Use Value: Maintains <20 pF capacitance to avoid signal distortion at 2.048 MHz, while providing fail-safe short-circuit response per ITU-T K20. |
| ISDN BRI Terminal Protection | FCC Part 68 Compliant Modem |
Use Scenario: Securing ISDN basic rate interface (2B+D) ports in fax machines, PBX extensions, and terminal adapters. IC Role / Device Role / Timing Role: Standoff-rated crowbar protecting D-channel and B-channel line receivers from longitudinal surges. Use Value: 62 V VRM aligns with ISDN nominal ±48 V supply rails; 150 mA IH ensures stable latch during 10/1000 µs surges up to 50 A. | Use Scenario: Enabling Class A lightning surge compliance for POTS-connected modems and VoIP gateways. IC Role / Device Role / Timing Role: Primary protection element in series with line interface transformer, upstream of hybrid circuit. Use Value: UL497B listing and 1500 V/10/160 µs capability meet FCC Part 68 Type A requirements with ≥12.5 Ω series resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMTPA62 | Same electrical specs (62 V VRM, 85 V VBO, 50 A IPP), but in SMB (DO-214AA) package with lower Rth(j-l) (20 °C/W vs. 30 °C/W). | Higher power dissipation capability in compact SMB footprint; preferred for space-constrained designs with higher thermal load. | Select SMTPA62 when board layout requires smaller body size or improved thermal conduction to leads. |
| TPA62 | Identical electrical parameters, but in through-hole DO-15 package (0.40 g weight, 1000-piece ammopack); Rth(j-a) = 100 °C/W. | Supports wave-solder or manual rework; suited for legacy telecom hardware or mixed-technology assemblies. | Choose TPA62 for prototyping, low-volume production, or systems requiring mechanical robustness and serviceability. |
Compared with SMTPA62 and TPA62, SMP50-62 offers optimal balance of SMT manufacturability, thermal performance (Rth(j-a) = 120 °C/W), and industry-standard SMA footprint - making it ideal for high-volume telecom line card production where JEDEC-compliant reflow and GR-1089 compliance are critical.
Availability
SMP50-62 is available at Aetrix Electronics and suitable for DSL line cards, T1/E1 interface modules, and ISDN terminal equipment requiring stable component supply, long-term lifecycle support, and certified surge protection performance.
Supply support for SMP50-62 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 automotive, industrial, power, and analog/mixed-signal technologies with manufacturing in Europe, Asia, and North America.
The Trisil™ product line was developed explicitly for fail-safe, bidirectional surge protection in telecom infrastructure - addressing GR-1089, ITU-T K-series, and FCC Part 68 compliance requirements with standardized, UL-certified components.
FAQ
What is the fail-safe behavior of SMP50-62 during surge events?
SMP50-62 enters a permanent low-resistance short-circuit state upon successful triggering, ensuring continued protection even after the surge has passed. This fail-safe mode is validated per UL497B and prevents latent open-circuit failure that could leave downstream circuitry unprotected - critical for telecom equipment safety certification.
How does SMP50-62 differ from standard TVS diodes in telecom protection?
Unlike unidirectional or bidirectional TVS diodes, SMP50-62 is a thyristor-based crowbar device with latching behavior: once triggered, it remains conductive until current drops below 150 mA. This provides superior energy handling (50 A @ 10/1000 µs) and fail-safe operation, whereas TVS diodes clamp non-latching and may degrade after repeated surges.
Can SMP50-62 be used in DC power line protection?
No - SMP50-62 is not rated for continuous DC power rail protection. Its 62 V stand-off voltage and 150 mA holding current require a series current-limiting resistor to ensure automatic turn-off after surge clearance. It is engineered exclusively for AC-coupled telecom line interfaces with defined impedance and transient-only stress profiles.
What PCB layout considerations are essential for SMP50-62 thermal performance?
Use the ST-recommended SMA footprint with ≥10 mm² copper pour connected to both terminals to achieve the specified 120 °C/W junction-to-ambient thermal resistance. Avoid narrow traces or isolated pads; thermal vias under the cathode pad improve heat dissipation. Do not exceed 260 °C for 10 s during soldering per JEDEC J-STD-020.
SMP50-62 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMP, TRISIL™
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMP50-62 FAQ
1.How can I place an order for SMP50-62 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP50-62 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 SMP50-62 reliable?
The price and inventory of SMP50-62 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP50-62 is usually 5 days.
3.What payment methods are accepted for SMP50-62?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP50-62 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP50-62?
SMP50-62 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP50-62 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 SMP50-62?
For technical support, including SMP50-62 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP50-62 requirements.
6.How does Aetrix verify that SMP50-62 is sourced from the original manufacturer or authorized distributors?
All SMP50-62 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 SMP50-62 meets industry standards.
7.What is the process for return or replacement of SMP50-62?
All SMP50-62 units undergo pre-shipment inspection (PSI). If there is an issue with SMP50-62, 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 SMP50-62 part is unused and in its original packaging.
Return procedure for SMP50-62:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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