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Semtech Corporation S3BR20
- Part No.:
- S3BR20
- Manufacturer:
- Semtech Corporation
- Category:
- Bridge Rectifiers
- Package:
- -
- Datasheet:
-
S3BR20.pdf
- Description:
- BRIDGE RECT 3PHASE 2KV 500MA
- Quantity:
- Payment:
- Shipping:
Inventory:6,276
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Product details
Overview
S3BR20 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 20mΩ dynamic resistance. It protects USB Type-C power delivery buses and load switch inputs in industrial and IoT equipment.
For engineers reviewing the S3BR20 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for 22V bus protection design.
Technical Context
The S3BR20 uses a surge-rated FET as its primary protection element, activated by an integrated precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Its clamping voltage remains nearly constant across 24–40A peak pulse currents due to the FET's decreasing RDS(on) under surge conditions.
Unlike conventional TVS diodes, the S3BR20 maintains stable 27.5–28V clamping from −40°C to +125°C and exhibits minimal temperature-dependent drift in breakdown voltage (25–27.9V) and leakage current (130–600nA at 22V). It operates with 175pF junction capacitance at 22V and 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without triggering |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD input stages |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements for connector-facing protection |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot during fast transients and supports high-current diversion without thermal runaway |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC power rails and low-speed signal lines (e.g., CC/SBU, VBUS); not suitable for USB SS lanes |
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 (3,000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground connection for surge return path; all three pins must be connected to maximize current handling and minimize parasitic inductance |
| 4, 5, 6 | IN | Input terminal tied to protected bus (e.g., VBUS in USB-C); all three pins are internally paralleled and must be shorted externally for full 40A rating |
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 low-RDS(on) MOSFET - reduces energy dissipation in silicon junction and improves reliability under repeated surges |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - protects against switching noise in motor drives and industrial PLCs |
| Low-leakage operation | 130–600nA reverse leakage at 22V - avoids measurable power loss in always-on battery-backed systems (e.g., remote meters) |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to ESD at connectors and lightning-induced surges on long cables. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at the Type-C receptacle, clamping transients before they reach the PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across temperature and current range - prevents false overvoltage shutdown and ensures robust compliance with USB PD 3.0 fault tolerance. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in programmable logic controllers, robotics actuators, and smart metering systems. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on the load switch's internal MOSFET gate oxide and drain-source junction. Use Value: Clamps below 28V while handling 40A surges - avoids destructive avalanche failure of the load switch and extends system field lifetime. |
| IoT Edge Node Power Rail Protection | Tablet/Notebook VBUS Line Protection |
|
Use Scenario: Securing 22V-capable DC input rails in battery-powered IoT gateways with PoE+ or adapter inputs, subject to ESD and induced surges in unshielded enclosures. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power entry point, coordinated with upstream fuse and downstream LDOs. Use Value: 175pF capacitance and 22V working voltage enable clean integration without signal integrity impact - supports compact PCB layouts in space-constrained edge devices. |
Use Scenario: Protecting internal VBUS routing between USB-C port and system power management IC in thin-profile notebooks and tablets. IC Role / Device Role / Timing Role: Secondary protection device after connector-level TVS, providing high-energy backup clamping for board-level surge coupling. Use Value: DFN-6 footprint (1.6×1.6mm) saves >60% board area versus SO-8 TVS solutions - critical for ultra-thin form factors with strict height budgets. |
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 | Identical use case and placement; validated in USB-C PD reference designs | Select when sourcing flexibility or dual-sourcing is required without redesign |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 33V clamping at 24A, 0.25pF capacitance | Targeted at CC/SBU lines - unsuitable for VBUS due to lower surge rating and higher clamping | Use only for low-capacitance, low-energy signal-line protection; not a functional substitute for S3BR20 on power rails |
Compared with TDS2211P, S3BR20 offers identical performance and compatibility; compared with uClamp2411ZA, S3BR20 provides 67% higher peak current capability and 21% lower clamping voltage - making it the sole suitable option for 22V power rail EOS protection where surge energy exceeds 24A.
Availability
S3BR20 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for S3BR20 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 signal integrity.
The S3BR20 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability 22V power rail protection with superior clamping stability and surge endurance.
FAQ
What is the maximum continuous operating voltage for the S3BR20?
The S3BR20 has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely operate on DC or RMS power rails up to 22V without triggering. This matches nominal USB PD VBUS levels and industrial 24V systems with margin. Exceeding 22V risks premature conduction and accelerated degradation. The S3BR20 is rated for 22V continuous operation per Semtech's absolute maximum and electrical characteristics tables.
Does the S3BR20 require external bias or control signals to function?
No, the S3BR20 is a fully autonomous transient suppressor with no external control pins, bias requirements, or enable signals. Its internal trigger circuit activates the shunt FET automatically when voltage exceeds the breakdown threshold (~25–27.9V). The S3BR20 functions as a two-terminal device - simply connect pins 4–6 to the protected line and pins 1–3 to ground. No firmware, timing, or configuration is needed for the S3BR20 to deliver full protection.
How does the S3BR20's clamping voltage compare to standard TVS diodes at elevated temperatures?
At 125°C, the S3BR20 maintains 27.5–28V clamping across 24–40A, whereas typical 22V TVS diodes rise to ~38V at the same current and temperature due to positive temperature coefficient of dynamic resistance. This 10–11V margin prevents overvoltage damage to downstream 24V-rated ICs in thermally stressed environments. The S3BR20's FET-based architecture eliminates temperature-dependent clamping drift - a key differentiator confirmed in Semtech's Figure 3 clamping comparison.
Can the S3BR20 be used on high-speed data lines like USB SuperSpeed differential pairs?
No, the S3BR20 is not suitable for USB SuperSpeed (TX/RX), DisplayPort, or HDMI data lanes due to its 175pF junction capacitance at 22V, which would severely degrade signal integrity and violate USB 3.x impedance and loss specifications. It is intended exclusively for DC power rails and low-speed control lines (e.g., CC, SBU, VBUS). For high-speed lanes, Semtech recommends RClamp3371ZC (<0.25pF) - not the S3BR20.
What PCB layout practices are critical for optimal S3BR20 performance?
For full 40A surge capability, all three IN pins (4,5,6) must be shorted together with a low-inductance trace, and all three GND pins (1,2,3) must connect to a solid ground plane using multiple vias. Place the S3BR20 within 2mm of the protected connector to minimize trace inductance. Avoid thermal relief on GND pads and do not add a thermal pad - energy is dissipated in the FET channel, not the die junction. These guidelines are specified in Semtech's Figure 7 layout recommendation for the S3BR20.
S3BR20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Diode Type:
- Three Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 2 kV
- Current - Average Rectified (Io):
- 500 mA
- Voltage - Forward (Vf) (Max) @ If:
- 5 V @ 1 A
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2000 V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
S3BR20 FAQ
1.How can I place an order for S3BR20 through Aetrix?
Please submit a Request for Quotation (RFQ) for S3BR20 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 S3BR20 reliable?
The price and inventory of S3BR20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3BR20 is usually 5 days.
3.What payment methods are accepted for S3BR20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3BR20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S3BR20?
S3BR20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S3BR20 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 S3BR20?
For technical support, including S3BR20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3BR20 requirements.
6.How does Aetrix verify that S3BR20 is sourced from the original manufacturer or authorized distributors?
All S3BR20 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 S3BR20 meets industry standards.
7.What is the process for return or replacement of S3BR20?
All S3BR20 units undergo pre-shipment inspection (PSI). If there is an issue with S3BR20, 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 S3BR20 part is unused and in its original packaging.
Return procedure for S3BR20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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