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Semtech Corporation SC445TETRT
- Part No.:
- SC445TETRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
SC445TETRT.pdf
- Description:
- IC LED DRVR RGLTR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
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Product details
Overview
SC445TETRT 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, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD and Type-C VBus lines in industrial and portable equipment.
For engineers reviewing the SC445TETRT datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current-critical for USB PD bus protection, load switch input safeguarding, and high-reliability industrial interfaces where conventional TVS diodes exhibit rising clamping voltage with surge current or temperature.
Technical Context
The SC445TETRT 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. Unlike standard TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains <600nA reverse leakage at 22V, and delivers 1120W peak pulse power. The device is optimized for unsymmetrical line protection with ±1kV (1.2/50μs, RS=42Ω) surge rating and ±4kV EFT immunity per IEC 61000-4-4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBus and industrial 24V rail systems without derating |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common PD controllers |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for DC power bus protection without signal integrity impact |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast transients |
| Operating Temp | –40°C to +125°C - supports extended-range industrial and automotive under-hood applications |
Pinout & Package
SC445TETRT is housed in a RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with six terminals. All pins are surface-mount; thermal performance relies on PCB copper area and multiple ground vias-not an exposed thermal pad.
| 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 40A capability and minimize inductance |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection ensures uniform current sharing and optimal clamping stability |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across full 24–40A surge range-enables predictable system-level protection margin |
| FET-based shunt topology | Replaces PN-junction TVS; eliminates temperature-dependent clamping rise-stable performance from –40°C to +125°C |
| Low dynamic resistance | 20mΩ ensures minimal IR drop during surge, preserving voltage headroom for downstream ICs |
| High-energy surge handling | 1120W peak power (8/20μs) supports repeated lightning-surge events without degradation |
| DFN space efficiency | 1.6×1.6mm footprint saves >60% board area vs. SOT-23 TVS solutions while maintaining 6-terminal robustness |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD negotiation against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at connector, diverting transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents false overvoltage shutdown and ensures PD controller survival under worst-case ±1kV surges. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways exposed to field-installed wiring. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch during 40A surges-eliminates need for oversized external series resistors or redundant protection stages. |
| Industrial 24V DC Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 24V auxiliary rails in programmable logic controllers (PLCs), motor drives, and factory automation equipment subject to inductive switching and long-cable coupling. IC Role / Device Role / Timing Role: Standalone transient suppressor on unregulated DC input, operating upstream of DC-DC converters and supervisors. Use Value: Delivers 40A surge capacity with <30V clamping-keeps downstream 24V-rated regulators and microcontrollers within safe operating area during IEC 61000-4-5 testing. |
Use Scenario: Protecting main battery or adapter input on thin-client notebooks and tablets where board space and thermal constraints limit traditional TVS use. IC Role / Device Role / Timing Role: Compact, low-capacitance (<200pF) clamp for high-current DC input paths, co-located with input connectors. Use Value: Enables compliance with IEC 61000-4-2 Level 4 (±30kV) without compromising layout density-reduces BOM count versus multi-device TVS arrays. |
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-6 package, identical marking code "T22" - direct Semtech replacement with same reel packaging (3,000 pcs/reel) | No functional difference; TDS2211P.C is the official orderable part number for the same die and assembly | Select TDS2211P.C when sourcing from authorized Semtech distributors; SC445TETRT may reflect alternate tape-and-reel labeling or regional distribution variant |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V clamping at 15.5A (8/20μs), 500mΩ dynamic resistance, 1500pF capacitance | Larger clamping voltage rise with current/temperature; higher capacitance limits use to low-speed power rails only | Choose SMAJ22A only if cost is primary constraint and clamping voltage margin >8V is acceptable; not suitable for USB PD or compact industrial designs |
Compared with TDS2211P.C, SC445TETRT offers identical performance and form factor but may differ in traceability or packaging logistics; versus SMAJ22A, SC445TETRT provides 8.5V lower clamping, 25× lower dynamic resistance, and 8.6× lower capacitance-making it viable for high-speed power buses where TVS diodes fail to meet voltage safety margins.
Availability
SC445TETRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and 24V DC power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed surge performance across temperature extremes.
Supply support for SC445TETRT 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.
SC445TETRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability power-line protection where stable clamping, low dynamic resistance, and wide temperature operation are mandatory.
FAQ
What is the exact package type and dimensions of SC445TETRT?
SC445TETRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pads for pins 1–3 (GND) and pins 4–6 (IN). The land pattern follows Semtech's recommended layout with no thermal pad required-surge energy is dissipated through the FET channel, not junction heating.
Does SC445TETRT support bidirectional or unidirectional transient suppression?
SC445TETRT is a unidirectional transient suppressor rated for 22V working voltage with reverse standoff capability. Its functional diagram shows a single shunt FET between IN and GND, and datasheet parameters (e.g., VRWM, VBR) are specified only for reverse-biased operation-no forward conduction path is defined for positive transients on GND.
How does SC445TETRT achieve constant clamping voltage across 24A to 40A surge currents?
SC445TETRT achieves constant clamping via a surge-rated FET whose RDS(on) decreases under high-current stress, counteracting the linear V = I × R increase seen in TVS diodes. The trigger circuit activates the FET at ~27V, and measured clamping stays within 27.5–28V from 24A to 40A-verified in Figure 3 of the TDS2211P datasheet.
Can SC445TETRT be used to protect USB SuperSpeed differential pairs (TX/RX)?
No-SC445TETRT is not suitable for USB SuperSpeed data lines. Its 175pF junction capacitance would severely degrade signal integrity on 10Gbps lanes. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); SC445TETRT is intended exclusively for VBus, CC, SBU, or power-rail protection.
What is the maximum continuous power dissipation rating for SC445TETRT at 25°C ambient?
SC445TETRT is not rated for continuous power dissipation-it is a transient-only protector. Its absolute maximum ratings specify only peak pulse power (1120W, 8/20μs) and operating temperature range (–40°C to +125°C). Under normal DC bias (22V), reverse leakage remains ≤600nA, resulting in <14μW static power-no heatsinking or derating is needed.
SC445TETRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 27V
- Voltage - Output:
- 42V
- Current - Output / Channel:
- 150mA
- Frequency:
- 700kHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
SC445TETRT FAQ
1.How can I place an order for SC445TETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC445TETRT 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 SC445TETRT reliable?
The price and inventory of SC445TETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC445TETRT is usually 5 days.
3.What payment methods are accepted for SC445TETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC445TETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC445TETRT?
SC445TETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC445TETRT 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 SC445TETRT?
For technical support, including SC445TETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC445TETRT requirements.
6.How does Aetrix verify that SC445TETRT is sourced from the original manufacturer or authorized distributors?
All SC445TETRT 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 SC445TETRT meets industry standards.
7.What is the process for return or replacement of SC445TETRT?
All SC445TETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC445TETRT, 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 SC445TETRT part is unused and in its original packaging.
Return procedure for SC445TETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC445TETRT Tags
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