My Inquiry
My Account
Semtech Corporation SC189BULTRT
- Part No.:
- SC189BULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
SC189BULTRT.pdf
- Description:
- IC REG BUCK 1.1V 1.5A 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:2,923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC189BULTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across full current and temperature range (−40°C to +125°C), enabling robust USB Type-C PD bus protection.
For engineers reviewing the SC189BULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, DFN-6 package layout guidance, functional role in load switch input protection, and validated alternative options for 22V EOS suppression in industrial and portable electronics.
Technical Context
The SC189BULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge conditions - not fixed dynamic resistance.
It operates with a 22V reverse stand-off voltage (VRWM), 27.9V typical breakdown (VBR), and 20mΩ dynamic resistance (RDYN) at 8/20μs pulses. Its 175pF junction capacitance at 22V/1MHz and <600nA leakage ensure minimal signal distortion on protected lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage before triggering; matches USB PD VBus up to 20V nominal + margin. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements with 2Ω source impedance. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity standards without derating. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal integrity degradation on 100Mbps+ power/data buses like USB Type-C VBus. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve; reduces voltage overshoot during fast-rising transients compared to TVS diodes. |
Pinout & Package
SC189BULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. The compact footprint saves >50% board area versus SOT-23 or SOIC alternatives while supporting high-current surge handling via parallel pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path 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., USB PD VBus); tied together internally and externally to distribute transient energy across multiple bond wires and package leads. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across 24–40A IPP and −40°C to +125°C - eliminates thermal derating uncertainty and simplifies margin analysis for safety-critical designs. |
| FET-Based Protection Architecture | Surge-rated shunt FET + precision trigger circuit - replaces avalanche diode limitations with active switching behavior for superior energy diversion efficiency. |
| Low Dynamic Resistance | 20mΩ - minimizes IR drop during surge, enabling tighter clamping than TVS devices with fixed RDYN >1Ω. |
| High EFT Immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and industrial control interfaces. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V USB PD VBus lines from lightning-induced surges and connector hot-plug ESD events in portable docking stations. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch input. Use Value: Maintains 28V clamping at 40A and 125°C - prevents latch-up or gate oxide rupture in downstream silicon where TVS solutions exceed safe voltage limits. |
Use Scenario: Safeguarding enable and input pins of industrial-grade e-fuses (e.g., HS2950P) exposed to field wiring transients in remote metering systems. IC Role / Device Role / Timing Role: Front-end transient diverter that clamps surges before they reach the load switch's internal FET drain-source junction. Use Value: Limits stress on the load switch's RDS(on) and gate oxide by holding clamp voltage below 30V - extending reliability in ungrounded or long-cable installations. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet Main Power Input Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways subjected to ESD during field maintenance and conducted surges from shared AC adapters. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS + MOV networks for space-constrained edge nodes. Use Value: 1.6mm × 1.6mm DFN footprint enables placement directly at board edge connectors - reducing PCB trace inductance and improving high-frequency ESD response. |
Use Scenario: Protecting main system power input (e.g., barrel jack or USB-C port) in thin-client notebooks against accidental 42Ω/0.5μF ±1kV surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-line defense upstream of DC-DC converters and battery charge management ICs. Use Value: 1120W peak pulse power rating handles worst-case combination-wave surges without thermal runaway - unlike polymer-based or standard TVS alternatives. |
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-manufactured variant with tape-and-reel packaging (3,000 pcs/reel). | Same use cases; differs only in packaging format and reel quantity - no design or layout impact. | Select TDS2211P.C when sourcing from authorized Semtech distributors requiring standard reel quantities and traceable lot codes. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs); higher clamping, no constant-voltage behavior; 200W PPPK vs. 1120W. | Acceptable only for lower-energy threats (<12A) or ambient-temperature-limited environments - cannot replace SC189BULTRT in USB PD or industrial surge scenarios. | Choose SMAJ22A only for cost-sensitive, non-critical 22V rail protection where clamping voltage margin >7V is acceptable and peak current ≤12A. |
Compared with TDS2211P.C, SC189BULTRT shares identical performance and form factor but may differ in date-code marking or internal lot traceability; versus SMAJ22A, SC189BULTRT offers 3.4× higher surge rating, 8V lower clamping, and temperature-stable protection - making it suitable for next-generation USB PD and industrial power interface designs.
Availability
SC189BULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for SC189BULTRT 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 SC189BULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-energy EOS protection roles where stable clamping, wide temperature operation, and compact size are critical.
FAQ
What is the exact package type and dimensions of SC189BULTRT?
SC189BULTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad-less construction. Pin 1 is marked by a laser dot; pins 1–3 are GND, and pins 4–6 are IN. The land pattern follows Semtech's recommended layout with multiple vias to ground plane for optimal surge current handling - confirmed in the official TDS2211P datasheet Rev 2.5.
Does SC189BULTRT support bidirectional or unidirectional transient protection?
SC189BULTRT is a unidirectional Transient Diverting Suppressor optimized for positive-going transients on 22V DC rails. Its functional diagram shows a shunt FET triggered by overvoltage relative to ground, and its absolute maximum ratings specify only positive peak pulse current (IPP = +40A). It does not provide symmetrical clamping for negative excursions - unlike bidirectional TVS devices.
How does SC189BULTRT achieve constant clamping voltage across varying surge currents?
SC189BULTRT achieves constant clamping by using a surge-rated FET whose RDS(on) decreases under high-current conditions, counteracting the linear VC = VBR + IPP × RDYN behavior of TVS diodes. As current rises from 24A to 40A, its dynamic resistance drops to ~20mΩ, maintaining clamping at 27.5–28V - a feature validated in Figure 3 of the TDS2211P datasheet.
Can SC189BULTRT be used to protect high-speed data lines like USB SuperSpeed differential pairs?
No - SC189BULTRT is not suitable for USB SuperSpeed (TX/RX), DisplayPort, or HDMI data lines due to its 175pF junction capacitance, which would severely degrade signal integrity above ~100Mbps. It is intended exclusively for power or low-speed control lines (e.g., VBus, CC, SBU). For data lines, Semtech recommends RClamp3371ZC (<0.25pF) alongside SC189BULTRT in complete USB Type-C protection schemes.
What is the maximum operating temperature range for SC189BULTRT, and how does performance change across it?
SC189BULTRT operates from −40°C to +125°C ambient. Its clamping voltage remains stable at 27.5–28V from −40°C to +125°C at 40A (8/20μs), and breakdown voltage shifts only +0.015V/°C - confirmed in Figures 3 and 4 of the TDS2211P datasheet. This stability eliminates thermal derating calculations required for standard TVS diodes, whose VC increases significantly with temperature.
SC189BULTRT 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD-UT (2x2)
SC189BULTRT FAQ
1.How can I place an order for SC189BULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC189BULTRT 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 SC189BULTRT reliable?
The price and inventory of SC189BULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC189BULTRT is usually 5 days.
3.What payment methods are accepted for SC189BULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC189BULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC189BULTRT?
SC189BULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC189BULTRT 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 SC189BULTRT?
For technical support, including SC189BULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC189BULTRT requirements.
6.How does Aetrix verify that SC189BULTRT is sourced from the original manufacturer or authorized distributors?
All SC189BULTRT 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 SC189BULTRT meets industry standards.
7.What is the process for return or replacement of SC189BULTRT?
All SC189BULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC189BULTRT, 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 SC189BULTRT part is unused and in its original packaging.
Return procedure for SC189BULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC189BULTRT 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
