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Semtech Corporation SMDA12C.TBT
- Part No.:
- SMDA12C.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA12C.TBT.pdf
- Description:
- TVS DIODE 12VWM 24VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,242
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Product details
Overview
SMDA12C.TBT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 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 SMDA12C.TBT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated pin-to-ground/input terminal mapping, real-world USB PD and load switch use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
SMDA12C.TBT implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transients to ground. Its clamping voltage remains stable across 24–40A peak pulse current (8/20μs) due to the FET's ultra-low dynamic resistance (20mΩ).
The device operates from −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and maintains constant clamping performance independent of temperature - unlike conventional TVS diodes whose VC rises linearly with IPP and ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common load switches and PD controllers. |
| ESD Rating | ±30kV contact & air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for handheld and portable equipment. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity for industrial and automotive power inputs. |
| Dynamic Resistance | 20mΩ - enables near-constant clamping by minimizing I×R voltage rise across full surge current range. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for DC power line protection without signal integrity impact. |
| Operating Temp | −40°C to +125°C - supports extended-temperature deployment in industrial and automotive under-hood applications. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch VIN); parallel connection ensures uniform current distribution and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers flat clamping voltage across 24–40A and −40°C to +125°C - eliminates thermal derating and current-dependent overshoot. |
| Ultra-low dynamic resistance | 20mΩ enables <0.8V additional drop at 40A - critical for maintaining safe voltage margin below downstream IC absolute maximum ratings. |
| High-energy surge capability | 1120W peak pulse power (8/20μs) supports repeated lightning-surge events without degradation in industrial environments. |
| Low leakage & capacitance | <600nA @ 22V and 175pF @ 1MHz - avoids standby power loss and signal loading on DC power rails. |
| Compact DFN footprint | 1.6×1.6mm area saves >60% board space vs. SO-8 or SOT-23 TVS alternatives - ideal for space-constrained USB-C and IoT modules. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
Use Scenario: Protecting the VBUS line of a USB-C port supporting up to 20V/5A PD negotiation against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting EOS energy to ground before it reaches the PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across full temperature range and 40A surge - prevents latch-up or gate oxide damage in 24V-tolerant PD controllers like TUSB73x or STUSB4500. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P, TPS229xx) in programmable logic controllers and remote metering terminals. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN rail, limiting transient overvoltage during field wiring faults or inductive kickback. Use Value: Clamps below 28V while handling 40A surges - keeps load switch internal FET VDS within safe SOA, avoiding destructive avalanche or thermal runaway. |
| IoT Edge Node Power Rail Protection | Storage Device 24V Backup Supply Protection |
Use Scenario: Securing the main 22–24V DC input of battery-backed wireless sensor nodes exposed to outdoor ESD and conducted surges. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converters and battery management ICs. Use Value: −40°C to +125°C operation and <600nA leakage ensure reliable protection in uncontrolled environments without increasing quiescent power or degrading cold-start behavior. |
Use Scenario: Protecting the 24V auxiliary supply rail feeding NVMe SSDs or SATA storage controllers during hot-swap or power-fail recovery sequences. IC Role / Device Role / Timing Role: Surge clamp on backup power input to prevent data corruption or controller reset caused by voltage spikes on shared power planes. Use Value: 175pF capacitance avoids resonance with PCB trace inductance, and stable clamping prevents false brown-out detection in storage controller power monitors. |
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 die, identical electrical specs and package - direct manufacturer-recommended replacement with identical marking (T22XX) and reel packaging. | Identical use in USB-C PD, load switch, and industrial 22V rail protection. | Select when sourcing from Semtech-authorized channels with full traceability and lifecycle support. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 20A (8/20μs) rating and higher 33V clamping at 20A - uses silicon avalanche diode, not FET-based architecture. | Better suited for CC/SBU lines in USB-C; insufficient for VBUS or load switch inputs requiring 40A surge handling. | Choose only for secondary signal-line protection where lower surge rating and higher clamping are acceptable. |
Compared with TDS2211P and uClamp2411ZA, SMDA12C.TBT offers identical FET-based clamping performance and 40A surge rating as TDS2211P but may differ in date-code marking or tape/reel logistics; uClamp2411ZA provides lower-cost TVS protection but cannot replace SMDA12C.TBT in high-energy power-line applications due to inferior current handling and clamping stability.
Availability
SMDA12C.TBT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SMDA12C.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 fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, power management, and transient protection.
SMDA12C.TBT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power-rail protection applications where stable clamping and temperature-invariant surge response are mandatory.
FAQ
What is the exact working voltage rating of SMDA12C.TBT?
The SMDA12C.TBT has a reverse stand-off voltage (VRWM) of 22V, meaning it remains non-conductive up to 22V under normal operating conditions. This rating aligns precisely with USB PD 20V nominal + 10% tolerance and industrial 24V rail derating requirements, ensuring no leakage or premature conduction during steady-state operation.
Does SMDA12C.TBT provide true bidirectional ESD protection?
Yes, SMDA12C.TBT delivers symmetrical ±30kV ESD protection per IEC 61000-4-2 (contact and air), verified across both polarities. Its FET-based architecture enables equal clamping performance regardless of transient polarity - critical for protecting bidirectional power lines like USB-C VBUS during plug insertion/removal or fault conditions.
How does SMDA12C.TBT's clamping voltage compare to standard TVS diodes at elevated temperature?
Unlike standard TVS diodes whose clamping voltage increases with temperature and peak current, SMDA12C.TBT maintains 27.5–28V clamping from −40°C to +125°C and across 24–40A (8/20μs). This stability is achieved via its FET-based shunt design, eliminating the VBR + IPP×RDYN dependency inherent in PN-junction devices.
Can SMDA12C.TBT be used to protect high-speed data lines like USB SS or PCIe?
No - SMDA12C.TBT is not suitable for high-speed data line protection due to its 175pF junction capacitance, which would severely degrade signal integrity on superspeed lanes. It is specifically designed for DC power and low-frequency I/O lines; for USB SS or DP/DM, Semtech recommends RClamp3371ZC (<0.25pF) instead.
What is the recommended PCB layout for optimal surge performance of SMDA12C.TBT?
Place SMDA12C.TBT within 2mm of the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using ≥3 vias. Avoid thermal relief on GND pads and minimize trace inductance - this layout ensures full 40A surge current sharing and sub-10nH ground loop inductance.
SMDA12C.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- SMDAC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 4
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 120pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SMDA12C.TBT FAQ
1.How can I place an order for SMDA12C.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA12C.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 SMDA12C.TBT reliable?
The price and inventory of SMDA12C.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA12C.TBT is usually 5 days.
3.What payment methods are accepted for SMDA12C.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA12C.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA12C.TBT?
SMDA12C.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA12C.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 SMDA12C.TBT?
For technical support, including SMDA12C.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA12C.TBT requirements.
6.How does Aetrix verify that SMDA12C.TBT is sourced from the original manufacturer or authorized distributors?
All SMDA12C.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 SMDA12C.TBT meets industry standards.
7.What is the process for return or replacement of SMDA12C.TBT?
All SMDA12C.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SMDA12C.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 SMDA12C.TBT part is unused and in its original packaging.
Return procedure for SMDA12C.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA12C.TBT Tags
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