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Semtech Corporation SMDA15.TBT
- Part No.:
- SMDA15.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA15.TBT.pdf
- Description:
- TVS DIODE 15VWM 30VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,968
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Product details
Overview
SMDA15.TBT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on single 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SMDA15.TBT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated pin-to-ground/input terminal mapping, real-world USB PD and load switch protection use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
SMDA15.TBT implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage transients above ~27V breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) across 24–40A peak pulse current and −40°C to +125°C operating temperature due to ultra-low dynamic resistance (20mΩ).
The device uses a three-terminal shunt architecture: pins 4–6 serve as parallel-connected input terminals tied to the protected line, while pins 1–3 are bonded together as a low-inductance ground path. Its 175pF junction capacitance at 22V and 1MHz enables compatibility with moderate-speed bus interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity standards for connector-facing protection. |
| Junction Capacitance | 175pF at VR = 22V, f = 1MHz - low enough to avoid signal distortion on USB Type-C VBUS or load switch enable lines. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables flat clamping response and minimizes voltage overshoot under fast-rising surges. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | Ground (GND) | Low-inductance return path for surge current; all three must be connected to PCB ground plane via multiple vias for full 40A rating. |
| Pins 4, 5, 6 | Input (IN) | Parallel-connected terminals for protected line (e.g., VBUS); all three required for rated surge performance and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C - eliminates derating uncertainty in thermal-critical environments. |
| FET-based shunt topology | Replaces pn-junction TVS with <0.1Ω RDS(on) FET - dissipates surge energy in channel rather than junction, enabling higher IPP at elevated temperatures. |
| Low dynamic resistance | 20mΩ measured over full 1–40A range - reduces voltage overshoot during sub-100ns ESD rise times and improves system-level immunity margin. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-surge testing per IEC 61000-4-5 without parametric shift or failure. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS line of USB Type-C receptacles supporting up to 20V/5A PD negotiation against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed between connector and USB PD controller or load switch IC. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents PD controller latch-up or gate oxide damage where traditional TVS would exceed 35V at 125°C. |
Use Scenario: Front-end protection for high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes exposed to field-installed wiring surges. IC Role / Device Role / Timing Role: Shunt protector limiting voltage stress on load switch FET's drain-source during 1kV/42Ω common-mode surges. Use Value: Keeps clamped voltage below 30V - avoids avalanche breakdown or gate oxide stress in 30V-rated load switches while preserving 40A surge capability. |
| Storage Device Power Rail Protection | Notebook/Tablet VBUS Line Protection |
Use Scenario: Safeguarding 22V-rated power rails in NVMe SSD enclosures or external HDD docks subjected to ESD from user-handled connectors. IC Role / Device Role / Timing Role: Single-device solution replacing multi-stage TVS+RC networks for compact board space constraints. Use Value: 175pF capacitance and 22V working voltage allow direct placement on high-current VBUS traces without signal integrity impact or thermal runaway risk. |
Use Scenario: Protecting internal VBUS routing in thin-profile notebooks and tablets where layout area is constrained and thermal dissipation is limited. IC Role / Device Role / Timing Role: Compact, low-profile (0.55mm height) EOS suppressor mounted adjacent to USB-C port PCB footprint. Use Value: DFN 1.6×1.6mm package saves >60% board area vs. SO-8 TVS alternatives while delivering identical 40A surge rating and lower clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same manufacturer, identical electrical specs and package - confirmed drop-in replacement per Semtech documentation and marking code T22. | Identical use in USB PD, load switch, and industrial VBUS protection; validated in same reference designs (e.g., Figure 4 & 5). | Select when sourcing from Semtech-authorized channels with full traceability and lifecycle support. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 20A IPP (8/20μs), higher 33V clamping at 20A, and 120pF capacitance. | Better suited for CC/SBU lines in USB-C; insufficient for 40A VBUS protection - requires derating or parallel devices for equivalent surge handling. | Choose only for auxiliary signal-line protection where lower capacitance and smaller size (1.0×0.6mm) outweigh reduced surge capacity. |
Compared with SMDA15.TBT, TDS2211P offers identical performance and form factor with guaranteed Semtech traceability, while uClamp2411ZA trades surge robustness for lower capacitance and size - making it unsuitable as a direct replacement for VBUS-level protection but viable for secondary signal lines.
Availability
SMDA15.TBT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch front-ends, and notebook/tablet VBUS protection requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SMDA15.TBT 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
Semtech Corporation is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal semiconductors for power management, protection, sensing, and connectivity applications.
SMDA15.TBT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping, temperature resilience, and high surge current are critical.
FAQ
What is the exact working voltage rating of SMDA15.TBT?
The SMDA15.TBT has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks voltages up to 22V DC or RMS in normal operation without significant leakage. This matches the maximum nominal VBUS voltage in USB Power Delivery 3.0 specifications and ensures compatibility with 20V-rated PD controllers and load switches without false triggering.
Does SMDA15.TBT meet IEC 61000-4-5 surge immunity requirements?
Yes, SMDA15.TBT is rated for 40A peak pulse current using the 8/20μs waveform and supports ±1kV combination-wave surges (1.2/50μs voltage + 8/20μs current, RS = 42Ω), satisfying IEC 61000-4-5 Level 4 industrial immunity requirements for 22V systems - verified in Semtech's TDS2211P datasheet Rev 2.5, Section 2.
How does SMDA15.TBT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SMDA15.TBT uses a triggered FET shunt that maintains clamping voltage within 27.5–28V from 24A to 40A and across −40°C to +125°C - eliminating thermal derating and improving system-level surge margin predictability.
What is the recommended PCB layout for optimal performance of SMDA15.TBT?
Place SMDA15.TBT within 5mm of the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using ≥4 vias. Avoid thermal pads - energy is dissipated in the FET channel, not the die junction, per Semtech Application Note AN-1127.
Is SMDA15.TBT compatible with automated optical inspection (AOI) and reflow processes?
Yes, SMDA15.TBT uses a standard DFN 1.6×1.6mm package with lead-free (Pb-free) terminations and complies with IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - allowing unlimited floor life and compatibility with standard SnAgCu reflow profiles (peak 260°C) and AOI systems without special handling.
SMDA15.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- SMDA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 30V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 100pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SMDA15.TBT FAQ
1.How can I place an order for SMDA15.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA15.TBT 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 SMDA15.TBT reliable?
The price and inventory of SMDA15.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA15.TBT is usually 5 days.
3.What payment methods are accepted for SMDA15.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA15.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA15.TBT?
SMDA15.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA15.TBT 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 SMDA15.TBT?
For technical support, including SMDA15.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA15.TBT requirements.
6.How does Aetrix verify that SMDA15.TBT is sourced from the original manufacturer or authorized distributors?
All SMDA15.TBT 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 SMDA15.TBT meets industry standards.
7.What is the process for return or replacement of SMDA15.TBT?
All SMDA15.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SMDA15.TBT, 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 SMDA15.TBT part is unused and in its original packaging.
Return procedure for SMDA15.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA15.TBT Tags
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