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Semtech Corporation SMDA12.TBT
- Part No.:
- SMDA12.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA12.TBT.pdf
- Description:
- TVS DIODE 12VWM 24VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,302
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Product details
Overview
SMDA12.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 SMDA12.TBT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated thermal stability across –40°C to +125°C, confirmed low dynamic resistance (20mΩ), exact pin-to-ground/input terminal mapping, and real-world use cases in USB PD and IoT power rail protection.
Technical Context
The SMDA12.TBT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and exhibits stable 27.5–28V clamping at both 24A and 40A (1.2/50μs voltage + 8/20μs current combination waveform, RS = 2Ω), with junction capacitance of 175pF at 22V and 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds during surge events. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - provides robust system-level ESD resilience without external shielding. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with 22V power rails where signal integrity is secondary to surge robustness. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB PD); parallel connection of all three pins ensures full 40A rating and uniform current distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping over current range | 27.5–28V across 24–40A - eliminates need for oversized TVS selection to meet clamping budget at high temperature. |
| Temperature-stable clamping | No increase in VC from –40°C to +125°C - enables reliable protection in uncontrolled thermal environments (e.g., industrial enclosures). |
| FET-based shunt architecture | RDS(on) drops under surge - achieves lower clamping than PN-junction TVS while dissipating energy in channel rather than junction. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLC interfaces. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed between connector and USB PD controller or load switch. Use Value: Maintains 27.5–28V clamping at full 40A surge, preventing latch-up or gate oxide damage in downstream silicon even at 125°C ambient. |
Use Scenario: Shielding enable and input pins of industrial-grade e-fuses (e.g., HS2950P) from lightning-induced surges in remote meters or robotics. IC Role / Device Role / Timing Role: High-energy shunt clamp positioned directly at connector entry point before load switch input stage. Use Value: Limits transient voltage to ≤28V, staying well below typical 30–36V absolute maximum ratings of internal FETs in load switches. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs on compact PCBs. Use Value: 1.6×1.6mm footprint saves >60% board area vs. discrete TVS+capacitor solutions while delivering superior clamping consistency. |
Use Scenario: Safeguarding 22V supply rails in NVMe SSD enclosures or enterprise HDD backplanes subject to hot-swap transients. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power input, upstream of DC-DC converters and PMICs. Use Value: 1120W peak pulse power rating handles repeated 1.2/50μs surges without degradation, ensuring long-term reliability in data center environments. |
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 pinout - SMDA12.TBT is Semtech's alternate marking for TDS2211P per official ordering documentation. | Direct functional and mechanical replacement; used interchangeably in USB PD reference designs. | Select SMDA12.TBT when sourcing from distributors listing this part number; verify reel marking "T22" matches date code format. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, 0.25pF capacitance - optimized for CC/SBU lines, not power rails. | Intended for low-capacitance data-line protection; unsuitable for 22V VBUS due to lower surge rating and higher clamping (~33V at 20A). | Use only for auxiliary signal lines (CC, SBU); never substitute for SMDA12.TBT on power inputs requiring 40A surge handling. |
Compared with TDS2211P, SMDA12.TBT is an identical device with alternate marking - no design change required. Compared with uClamp2411ZA, SMDA12.TBT offers 2× higher peak current, 5V lower clamping, and 700× higher capacitance, making it suitable for power rail (not signal line) protection.
Availability
SMDA12.TBT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch front-ends, and IoT 22V power rail protection requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SMDA12.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 high-performance analog and mixed-signal ICs for precision sensing, protection, and connectivity.
SMDA12.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 across temperature and current is critical.
FAQ
Is SMDA12.TBT electrically identical to TDS2211P?
Yes, SMDA12.TBT is Semtech's alternate orderable part number for the TDS2211P device. Both share identical die, electrical specifications (including 22V VRWM, 27.5–28V clamping at 40A, and 20mΩ RDYN), pinout, package dimensions, and thermal performance across –40°C to +125°C.
What is the maximum continuous operating voltage for SMDA12.TBT?
The maximum continuous reverse stand-off voltage (VRWM) of SMDA12.TBT is 22V - meaning it reliably blocks voltages up to 22V DC without significant leakage (<600nA), making it suitable for 20V USB PD and 22V industrial power rails.
Can SMDA12.TBT be used on high-speed data lines like USB SuperSpeed?
No, SMDA12.TBT is not suitable for USB SuperSpeed (TX/RX) or DisplayPort lines due to its 175pF junction capacitance, which would severely degrade signal integrity. It is intended exclusively for 22V power or low-speed control lines such as VBUS, CC, or load switch enable inputs.
How should the six pins of SMDA12.TBT be routed on PCB?
All three GND pins (1, 2, 3) must connect to a solid ground plane using multiple vias; all three IN pins (4, 5, 6) must tie together via a short, wide trace to the protected line. Placement within 3mm of the connector is mandatory to minimize inductive coupling during ESD events.
Does SMDA12.TBT require a thermal pad or heatsink?
No - SMDA12.TBT dissipates surge energy in the FET channel, not the junction, and does not require a thermal pad. The DFN package relies on copper pour and via connections to ground for current handling, not thermal management; no thermal pad is specified in the land pattern.
SMDA12.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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- 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:
- 150pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SMDA12.TBT FAQ
1.How can I place an order for SMDA12.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA12.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 SMDA12.TBT reliable?
The price and inventory of SMDA12.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA12.TBT is usually 5 days.
3.What payment methods are accepted for SMDA12.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA12.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA12.TBT?
SMDA12.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA12.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 SMDA12.TBT?
For technical support, including SMDA12.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA12.TBT requirements.
6.How does Aetrix verify that SMDA12.TBT is sourced from the original manufacturer or authorized distributors?
All SMDA12.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 SMDA12.TBT meets industry standards.
7.What is the process for return or replacement of SMDA12.TBT?
All SMDA12.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SMDA12.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 SMDA12.TBT part is unused and in its original packaging.
Return procedure for SMDA12.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA12.TBT Tags
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