My Inquiry
My Account
Semtech Corporation SC21154AULTRC
- Part No.:
- SC21154AULTRC
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC21154AULTRC.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:2,965
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC21154AULTRC 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 PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC21154AULTRC datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC21154AULTRC 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 conventional TVS diodes, its clamping voltage remains nearly constant - 27.5–28V - across 24A to 40A peak pulse current and from –40°C to +125°C.
This behavior stems from the FET's decreasing RDS(on) under surge conditions, yielding ultra-low dynamic resistance (20mΩ) and minimal voltage rise with increasing current. The device operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with IEC 61000-4-5 Level 4 (±1kV, RS=42Ω) on unsymmetrical lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - enables robust handling in manufacturing and end-user environments without degradation. |
| Dynamic Resistance | 20mΩ - minimizes voltage overshoot during fast-rising transients and reduces power dissipation in the device. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for VBus protection without signal integrity impact on DC/low-frequency power lines. |
Pinout & Package
SC21154AULTRC is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm, with exposed thermal pad not required due to energy-dissipating FET architecture.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection of all three pins ensures uniform current distribution and 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 thermally demanding applications. |
| FET-based shunt protection | Replaces traditional TVS junction conduction with low-RDS(on) switching - reduces thermal stress and improves reliability under repeated surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz bursts) - protects against repetitive fast transients in industrial control and motor drive environments. |
| Space-optimized footprint | 1.6mm × 1.6mm DFN-6 saves >60% board area vs. SOT-23 or SOIC alternatives - critical for compact USB Type-C and IoT designs. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD during hot-plug and lightning-induced surges in docking stations. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch, responding within nanoseconds to divert transients to ground. Use Value: Maintains 27.5–28V clamping across temperature - avoids overvoltage damage to 24V-tolerant PD controllers where conventional TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and PLC I/O modules subjected to 40A lightning surges. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents catastrophic failure of the load switch by holding clamping voltage below its absolute maximum rating (typically 30–36V), even at full 40A surge. |
| IoT Device Power Rail Protection | Notebook/Tablet VBus Line Protection |
|
Use Scenario: Securing 22V-capable power rails in battery-powered IoT gateways and edge sensors deployed in electrically noisy factory or outdoor environments. IC Role / Device Role / Timing Role: Single-component solution for combined ESD, EFT, and surge protection on main DC input, eliminating need for multi-stage TVS+MOV designs. Use Value: Delivers ±30kV ESD, ±4kV EFT, and 40A surge capability in one 1.6mm² device - simplifies BOM and PCB layout while meeting IEC 61000-6-2/6-4 immunity requirements. |
Use Scenario: Protecting VBus routing on thin, high-density notebook and tablet motherboards where space and thermal constraints limit discrete protection options. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-profile protector mounted directly at USB-C receptacle to minimize trace inductance and coupling. Use Value: Enables placement within 2mm of connector with no thermal pad - achieves <1nH ground loop inductance and preserves signal integrity on adjacent high-speed lanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking (T22), and shared Semtech datasheet Rev 2.5 - confirmed drop-in replacement per Semtech ordering documentation. | Same use cases: USB PD, load switch, industrial VBus. No functional or layout change required. | Select TDS2211P.C when sourcing from authorized Semtech channels with standard reel packaging (3,000 pcs/reel). |
| SP1003-02HTG | Lower 24V working voltage, 30A IPP rating, higher 33V clamping at 30A, and SOD-323 package - lacks constant-clamp FET architecture and exhibits voltage drift with current/temperature. | Suitable only for lower-energy 24V systems where 33V clamping is acceptable; not recommended for USB PD or high-temp industrial use. | Choose SP1003-02HTG only if board space allows larger SOD-323 footprint and system tolerates higher clamping voltage margin. |
Compared with SC21154AULTRC, TDS2211P.C offers identical performance and form factor with verified supply chain continuity, while SP1003-02HTG trades clamping stability and surge rating for legacy package compatibility - making SC21154AULTRC optimal for next-gen compact, thermally demanding designs.
Availability
SC21154AULTRC is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC21154AULTRC 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 analog and mixed-signal semiconductors for high-performance protection, sensing, connectivity, and power management.
The SC21154AULTRC belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection where stable clamping and temperature resilience are critical.
FAQ
What is the maximum continuous operating voltage for SC21154AULTRC?
The SC21154AULTRC has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without significant leakage current. This makes it suitable for nominal 20V USB PD VBus lines and other 22V-rated power rails where sustained voltage operation is required.
Does SC21154AULTRC require a thermal pad on the PCB?
No, the SC21154AULTRC does not require a thermal pad. Its FET-based architecture dissipates surge energy differently than junction-based TVS devices, and the datasheet explicitly states "no thermal pad is needed." Proper grounding of all three GND pins (1, 2, 3) via multiple vias is sufficient for thermal and electrical performance.
How does SC21154AULTRC 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 SC21154AULTRC maintains a nearly constant 27.5–28V clamp from 24A to 40A and across –40°C to +125°C due to its active FET shunt architecture and 20mΩ dynamic resistance.
Can SC21154AULTRC protect high-speed data lines like USB SS or DisplayPort?
No, the SC21154AULTRC is not intended for high-speed data line protection. With 175pF junction capacitance, it is optimized for VBus and power rail protection. For USB SuperSpeed, DP, or DM lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), as specified in the TDS2211P application notes.
Is SC21154AULTRC compliant with RoHS and halogen-free standards?
Yes, the SC21154AULTRC 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 - confirmed in the mechanical characteristics section of the official Semtech TDS2211P datasheet (Rev 2.5).
SC21154AULTRC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD (1.5x2)
SC21154AULTRC FAQ
1.How can I place an order for SC21154AULTRC through Aetrix?
Please submit a Request for Quotation (RFQ) for SC21154AULTRC 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 SC21154AULTRC reliable?
The price and inventory of SC21154AULTRC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC21154AULTRC is usually 5 days.
3.What payment methods are accepted for SC21154AULTRC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC21154AULTRC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC21154AULTRC?
SC21154AULTRC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC21154AULTRC 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 SC21154AULTRC?
For technical support, including SC21154AULTRC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC21154AULTRC requirements.
6.How does Aetrix verify that SC21154AULTRC is sourced from the original manufacturer or authorized distributors?
All SC21154AULTRC 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 SC21154AULTRC meets industry standards.
7.What is the process for return or replacement of SC21154AULTRC?
All SC21154AULTRC units undergo pre-shipment inspection (PSI). If there is an issue with SC21154AULTRC, 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 SC21154AULTRC part is unused and in its original packaging.
Return procedure for SC21154AULTRC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC21154AULTRC Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
