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Semtech Corporation SM1212E433
- Part No.:
- SM1212E433
- Manufacturer:
- Semtech Corporation
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
SM1212E433.pdf
- Description:
- RF EVAL FOR SX1212 433MHZ ISM
- Quantity:
- Payment:
- Shipping:
Inventory:4,948
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Product details
Overview
SM1212E433 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), and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SM1212E433 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The SM1212E433 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 due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with reverse stand-off voltage of 22V, breakdown at 25–27.9V, and junction capacitance of 175pF at 22V/1MHz - enabling robust protection without signal integrity degradation in high-speed interfaces like USB PD and industrial data lines.
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 most PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under surge, enabling flat clamping profile. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB PD VBUS line without affecting power delivery stability. |
| Operating Temp | –40°C to +125°C - supports extended industrial and automotive under-hood environments. |
Pinout & Package
SM1212E433 is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required - all six terminals are functional: three GND pins (1–3) and three IN pins (4–6), requiring parallel connection for full 40A rating and minimum parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to PCB ground plane via multiple vias. |
| 4, 5, 6 | IN | Protected line input (VBUS or power/data line); all three pins tied together at connector side for lowest impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across 24–40A and –40°C to +125°C - eliminates thermal runaway risk and enables predictable protection margin. |
| FET-Based Surge Shunt | Surge-rated MOSFET replaces PN-junction TVS - achieves <0.1Ω effective RDS(on), reducing energy dissipation in silicon junction. |
| Low Dynamic Resistance | 20mΩ measured between 1A–40A (8/20μs) - minimizes IR drop during surge, preserving clamping accuracy. |
| High EFT Immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in motor drives and PLCs. |
| Small Footprint | 1.6mm × 1.6mm DFN-6 - saves >60% board area versus SO-8 TVS solutions while maintaining 1120W peak power handling. |
Applications
| USB Type-C Power Delivery | Industrial Load Switch Input |
|---|---|
|
Use Scenario: Protecting VBUS line in USB-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt device placed directly at connector, clamping surges before reaching PD controller IC. Use Value: Maintains 28V clamping at 125°C - avoids overvoltage damage to controllers like STUSB4500 or TUSB564 where 30V absolute max is typical. |
Use Scenario: Front-end protection for industrial-grade load switches (e.g., ON Semi NIS513x) powering remote sensors or actuators. IC Role / Device Role / Timing Role: Transient energy diversion path limiting voltage stress on internal FET gate oxide and drain-source junction. Use Value: Enables use of lower-cost 30V-rated load switches instead of 40V+ variants, reducing BOM cost and footprint. |
| IoT Edge Node Power Rail | Industrial Equipment DC Input |
|
Use Scenario: Securing 24V DC input of battery-backed smart meters or gateway devices exposed to field wiring surges. IC Role / Device Role / Timing Role: First-line defense against induced lightning transients and hot-plug events on long cable runs. Use Value: Delivers 40A surge handling in 1.6mm² footprint - eliminates need for external MOVs or hybrid TVS+GDT stacks. |
Use Scenario: Protection of programmable logic controller (PLC) analog/digital I/O modules operating from 24V supply rails. IC Role / Device Role / Timing Role: Standalone EOS suppressor on backplane or terminal block inputs, replacing discrete Zener+SCR crowbar circuits. Use Value: Reduces failure rate in factory-floor environments where ESD and EFT events exceed 2kV routinely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN-6 package, identical marking code T22 - confirmed as direct replacement per Semtech documentation. | Same USB PD, load switch, and industrial 22V rail use cases - no redesign needed. | Select SM1212E433 when sourcing from Aetrix Electronics; TDS2211P is manufacturer's original part number. |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V clamping at 12.3A (8/20μs), 1000W peak power - significantly higher clamping and lower surge rating. | Limited to lower-energy applications; unsuitable for 40A IEC 61000-4-5 compliance or high-temp USB PD designs. | Use only if cost is primary constraint and clamping >35V is acceptable; requires thermal derating above 85°C. |
Compared with TDS2211P (identical function and form), SM1212E433 offers seamless drop-in availability through Aetrix; versus SMAJ22A, it delivers 3.2× higher surge current, 8.5V lower clamping, and stable performance across temperature - critical for reliable USB PD and industrial 24V system protection.
Availability
SM1212E433 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, full traceability, and lifecycle continuity support.
Supply support for SM1212E433 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 power management, protection, and signal integrity.
The SM1212E433 belongs to Semtech's Transient Diverting Suppressor (TDS) family - engineered to replace conventional TVS diodes in high-energy EOS applications where stable clamping, wide temperature operation, and compact size are essential.
FAQ
What is the exact package type and dimensions of SM1212E433?
SM1212E433 uses a DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with no thermal pad required. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. All six terminals must be soldered to achieve full 40A surge rating and minimize parasitic inductance per Semtech's layout guidelines.
How does SM1212E433 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), SM1212E433 maintains near-constant clamping (27.5–28V) from 24A to 40A and across –40°C to +125°C due to its FET-based shunt architecture and 20mΩ dynamic resistance - delivering predictable protection margins in demanding thermal environments.
Can SM1212E433 be used for USB Type-C CC line protection?
No - SM1212E433 is rated for 22V working voltage and optimized for high-current VBUS or power rail protection. For USB Type-C CC and SBU lines, Semtech recommends uClamp2411ZA (24V, low-capacitance TVS). Using SM1212E433 on CC lines would risk damage due to excessive capacitance (175pF) and inappropriate voltage rating.
What is the maximum junction temperature and thermal derating behavior of SM1212E433?
SM1212E433 has a junction temperature range of –55°C to +150°C and operates continuously from –40°C to +125°C. Its clamping voltage and peak pulse current remain stable across this range - no thermal derating is required for surge rating, unlike conventional TVS diodes whose IPP drops significantly above 85°C.
Is SM1212E433 RoHS compliant and halogen-free?
Yes - SM1212E433 is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free per J-STD-020 moisture sensitivity level 1 (MSL1) requirements.
SM1212E433 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Type:
- Transceiver
- Frequency:
- 433MHz
- Contents:
- Board(s)
- Utilized IC / Part:
- SX1212E
SM1212E433 FAQ
1.How can I place an order for SM1212E433 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM1212E433 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 SM1212E433 reliable?
The price and inventory of SM1212E433 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM1212E433 is usually 5 days.
3.What payment methods are accepted for SM1212E433?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM1212E433 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM1212E433?
SM1212E433 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM1212E433 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 SM1212E433?
For technical support, including SM1212E433 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM1212E433 requirements.
6.How does Aetrix verify that SM1212E433 is sourced from the original manufacturer or authorized distributors?
All SM1212E433 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 SM1212E433 meets industry standards.
7.What is the process for return or replacement of SM1212E433?
All SM1212E433 units undergo pre-shipment inspection (PSI). If there is an issue with SM1212E433, 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 SM1212E433 part is unused and in its original packaging.
Return procedure for SM1212E433:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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