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Semtech Corporation SMDA12C-8.TBT
- Part No.:
- SMDA12C-8.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA12C-8.TBT.pdf
- Description:
- TVS DIODE 12VWM 19VC 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:223
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Product details
Overview
SMDA12C-8.TBT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and ultra-low 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the SMDA12C-8.TBT datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp behavior across –40°C to +125°C, DFN 1.6×1.6mm 6-lead package footprint, 175pF junction capacitance at 22V, and shunt-FET architecture enabling lower clamping than conventional TVS diodes in high-voltage surge environments.
Technical Context
The SMDA12C-8.TBT implements a precision-triggered surge-rated FET as its primary protection element, activated by an internal reference circuit when transient voltage exceeds breakdown. Unlike standard TVS diodes, its clamping voltage remains nearly flat-27.5–28V-from 24A to 40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), maintains <600nA leakage at VRWM, and delivers stable performance across –40°C to +125°C ambient, with clamping variation <0.5V over full temperature range per test data.
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) - Ensures protected ICs (e.g., USB PD controllers) remain below absolute maximum ratings during lightning surges. |
| Peak Pulse Current | 40A (8/20μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB-C power delivery inputs. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - Provides robust handling of human-body-model ESD events in handheld and field-deployed devices. |
| Dynamic Resistance | 20mΩ - Enables low-voltage-drop conduction during surge, minimizing power dissipation and thermal stress on the device. |
| Junction Capacitance | 175pF at 22V, 1MHz - Low enough for DC power rails and medium-speed control lines; not suitable for >100MHz signal paths. |
| Operating Temperature | –40°C to +125°C - Supports operation in automotive under-hood, industrial PLC, and outdoor IoT enclosures without derating. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current-handling capability and minimize parasitic inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS or power rail); parallel connection ensures uniform current sharing and optimal clamping stability under 40A transients. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A and across –40°C to +125°C - eliminates design margin uncertainty vs. TVS diodes. |
| Shunt-FET protection core | Replaces PN-junction avalanche with low-RDS(on) MOSFET - reduces thermal runaway risk and enables higher single-pulse energy absorption. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving voltage margin for downstream components. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in motor drives and switching power supplies. |
| Space-efficient packaging | 1.6×1.6mm DFN footprint - saves >60% board area vs. SO-8 or SMA TVS solutions rated for equivalent 40A surge current. |
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 high-energy surge clamp placed directly at connector, shunting lightning-induced transients before reaching PD controller and e-fuse. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents false overvoltage shutdowns and avoids over-spec'ing IPP to compensate for TVS voltage drift. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction during surge events. Use Value: Clamps below 30V at 40A, preventing permanent damage to 30V-rated load switches while eliminating need for external series impedance or RC snubbers. |
| IoT Edge Node Power Rail Protection | Industrial Equipment DC Input Protection |
|
Use Scenario: Securing 24V DC input rails of battery-backed wireless sensors deployed outdoors or near AC mains. IC Role / Device Role / Timing Role: First-line defense against induced surges from nearby lightning strikes or inductive load switching in unshielded enclosures. Use Value: Delivers 1120W peak pulse power handling (40A × 28V) in a 2.56mm² footprint-enabling compact, certified Class II surge protection without heatsinking. |
Use Scenario: Protecting programmable logic controller (PLC) digital I/O modules powered from 24V industrial supplies. IC Role / Device Role / Timing Role: Standalone EOS suppressor on backplane or terminal block inputs, replacing multi-device TVS+MOV stacks. Use Value: Single-component solution meets IEC 61000-4-5 Level 4 (±1kV, 42Ω source) with no degradation after repeated 40A surges-reducing BOM count and failure modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN 1.6×1.6mm package, identical pinout (Pins 1–3 GND, Pins 4–6 IN), but marked "T22" and shipped in 3,000-unit tape-and-reel. | Direct replacement in new designs; same layout, same thermal and surge performance; differs only in marking and packaging format. | Select TDS2211P.C for volume production with automated placement; SMDA12C-8.TBT may be used for prototyping or legacy BOM alignment where marking or reel size differs. |
| uClamp2411ZA.TCT | 24V working voltage, ±30kV ESD, but lower 20A IPP rating and higher 33V clamping at 20A; uses SOD-323 package with 2-pin configuration. | Suitable for CC/SBU lines in USB-C, not for VBUS or power rails requiring 40A surge handling. | Choose uClamp2411ZA.TCT only for auxiliary signal lines; it cannot replace SMDA12C-8.TBT in high-current power rail roles due to IPP and clamping limitations. |
Compared with TDS2211P.C, SMDA12C-8.TBT offers identical protection performance and layout compatibility, differing only in part marking and packaging logistics; versus uClamp2411ZA.TCT, SMDA12C-8.TBT provides double the peak current rating and 5V lower clamping-making it the sole viable option for 22V power rail surge suppression.
Availability
SMDA12C-8.TBT is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SMDA12C-8.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 semiconductors for power management, protection, and signal integrity applications.
The SMDA12C-8.TBT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in high-voltage, high-energy surge environments where clamping stability across temperature and current is non-negotiable.
FAQ
What is the maximum operating temperature range for SMDA12C-8.TBT?
The SMDA12C-8.TBT is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable within 27.5–28V across this full range at 40A peak pulse current, as verified in the TDS2211P datasheet Figure 3 and Table 2. This makes SMDA12C-8.TBT suitable for under-hood automotive, industrial control cabinets, and outdoor IoT deployments where thermal cycling is severe.
Does SMDA12C-8.TBT require a thermal pad on the PCB?
No, SMDA12C-8.TBT does not require a thermal pad. As stated in the TDS2211P datasheet Section 6 ("Application Information"), energy during surge events is dissipated internally via the shunt FET, and no thermal pad is needed. Instead, layout best practice requires connecting all three GND pins (1, 2, 3) to a solid ground plane using multiple vias to minimize inductance-critical for maintaining 40A surge performance.
Can SMDA12C-8.TBT be used to protect high-speed data lines like USB SuperSpeed?
No, SMDA12C-8.TBT is not suitable for USB SuperSpeed (SS), DisplayPort, or other >100MHz signal lines. Its 175pF junction capacitance at 22V would severely attenuate high-frequency signals. The datasheet explicitly recommends low-capacitance TVS devices such as RClamp3371ZC (<0.25pF) for SS TX/RX lines. SMDA12C-8.TBT is intended only for DC power rails and medium-speed control lines.
How does SMDA12C-8.TBT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes-whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN)-the SMDA12C-8.TBT uses a triggered shunt FET that achieves near-constant clamping (27.5–28V from 24A to 40A). This eliminates the need to overspecify IPP just to hold clamping below IC damage thresholds, especially at elevated temperatures where TVS clamping degrades significantly.
Is SMDA12C-8.TBT pin-compatible with TDS2211P.C?
Yes, SMDA12C-8.TBT is pin-compatible with TDS2211P.C: both use the identical DFN 1.6×1.6mm 6-lead package with Pins 1–3 as GND and Pins 4–6 as IN. The functional diagram, pin configuration table, and land pattern drawings in the TDS2211P datasheet apply directly to SMDA12C-8.TBT. No PCB layout changes are required when substituting between these two orderable variants.
SMDA12C-8.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- SMDAC-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 8
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- 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:
- 14-SOIC
SMDA12C-8.TBT FAQ
1.How can I place an order for SMDA12C-8.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA12C-8.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-8.TBT reliable?
The price and inventory of SMDA12C-8.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-8.TBT is usually 5 days.
3.What payment methods are accepted for SMDA12C-8.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA12C-8.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA12C-8.TBT?
SMDA12C-8.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA12C-8.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-8.TBT?
For technical support, including SMDA12C-8.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA12C-8.TBT requirements.
6.How does Aetrix verify that SMDA12C-8.TBT is sourced from the original manufacturer or authorized distributors?
All SMDA12C-8.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-8.TBT meets industry standards.
7.What is the process for return or replacement of SMDA12C-8.TBT?
All SMDA12C-8.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SMDA12C-8.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-8.TBT part is unused and in its original packaging.
Return procedure for SMDA12C-8.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA12C-8.TBT Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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