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Semtech Corporation SM75F
- Part No.:
- SM75F
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SM75F.pdf
- Description:
- DIODE GEN PURP 7.5KV 290MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
SM75F 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 ultra-low 20mΩ dynamic resistance. It protects USB PD, Type-C VBUS, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SM75F datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature and current, and real-world use cases in USB Type-C and industrial power rail protection.
Technical Context
The SM75F 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-from 24A to 40A and across −40°C to +125°C due to decreasing RDS(on) under surge.
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and only 130–600nA leakage at VRWM, enabling low-power system compatibility. Its 175pF junction capacitance at 22V/1MHz supports moderate-speed bus protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD 20V nominal + margin; ensures no false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 30V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - enables stable clamping independent of current magnitude; eliminates linear VC = VBR + IPP×RDYN drift. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power rails and low-to-moderate-speed data lines (e.g., CC/SBU, VBUS monitoring). |
Pinout & Package
SM75F is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. The package features three dedicated ground terminals and three parallel input terminals for low-inductance, high-current surge conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must be connected to minimize parasitic inductance and maximize 40A surge handling. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); equal current sharing reduces thermal stress and improves reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from 24A to 40A and remains stable across −40°C to +125°C - eliminates derating uncertainty in thermal design. |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) MOSFET; dissipates energy in channel rather than junction, improving surge endurance and lifetime. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - ensures minimal voltage overshoot during fast-rising transients like ESD and lightning-induced surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in motor drives, PLCs, and industrial sensors. |
Applications
| USB Type-C VBUS Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the 20V-capable VBUS line in USB Type-C ports with Power Delivery negotiation. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at connector to clamp EOS events before reaching PD controller or buck converter. Use Value: Maintains 27.5–28V clamping at full 40A surge - avoids overvoltage damage to 30V-rated PD ICs and enables single-stage protection without upstream TVS staging. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes. IC Role / Device Role / Timing Role: Primary front-end surge diverter 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 ±1kV/42Ω IEC 61000-4-5 surges - extends field reliability and eliminates need for redundant protection. |
| USB PD Controller Interface Protection | Industrial Equipment Power Rail Protection |
|
Use Scenario: Securing communication lines (CC, SBU) and auxiliary power paths interfacing with USB PD controllers. IC Role / Device Role / Timing Role: Secondary-level protector co-deployed with low-capacitance TVS (e.g., uClamp2411ZA) on CC/SBU lines where 22V working voltage aligns with VBUS fault margins. Use Value: Provides robust ±30kV ESD immunity while maintaining tight clamping - prevents controller reset or firmware corruption during hot-plug events. |
Use Scenario: Hardening 24V DC input rails in programmable logic controllers, factory HMIs, and DIN-rail mounted power supplies. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, rated for repeated 40A transients and operating up to +125°C ambient. Use Value: Replaces bulkier multi-device TVS arrays with a single 1.6×1.6mm device - saves >60% board area while meeting IEC 61000-4-5 Level 4 compliance. |
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 die, identical electrical specs and package - SM75F is Semtech's alternate marking for TDS2211P per official ordering documentation. | Direct functional and mechanical replacement; same PCB footprint, thermal profile, and test validation. | Select SM75F when sourcing from Aetrix Electronics' inventory; identical performance and qualification to TDS2211P. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP, higher 33V clamping, 0.25pF capacitance - optimized for low-capacitance data-line protection, not power rail clamping. | Suitable for CC/SBU lines but not VBUS or load switch inputs due to insufficient surge rating and elevated clamping. | Use uClamp2411ZA only for signal-line protection adjacent to SM75F; never as a direct substitute for power rail EOS suppression. |
Compared with TDS2211P and uClamp2411ZA, SM75F delivers identical high-energy clamping performance as TDS2211P in a drop-in form factor, while uClamp2411ZA serves a complementary low-capacitance role - making SM75F the sole validated solution for 22V power rail surge protection requiring 40A capability and sub-28V clamping.
Availability
SM75F is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and 22V DC power rail protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SM75F 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 ICs for precision sensing, protection, and connectivity.
The SM75F belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability power rail protection where stable clamping, temperature independence, and high surge endurance are critical.
FAQ
What is the exact package type and dimensions of SM75F?
SM75F uses a 6-lead 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, pins 4–6 are IN. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating. This compact footprint enables high-density placement near connectors.
Does SM75F meet IEC 61000-4-5 surge immunity standards?
Yes, SM75F is rated for 40A peak pulse current under the 8/20μs waveform per IEC 61000-4-5 and withstands ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω) on unsymmetrical lines. Its stable 27.5–28V clamping ensures downstream components remain within safe operating voltage limits during standardized surge testing.
How does SM75F differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SM75F uses a triggered FET shunt that maintains ~27.5–28V clamping from 24A to 40A and across −40°C to +125°C. This eliminates thermal derating uncertainty and provides predictable protection margins in wide-temperature industrial environments.
Can SM75F be used for USB Type-C VBUS protection alongside other Semtech protectors?
Yes, SM75F is explicitly recommended for USB Type-C VBUS protection in Semtech's reference designs. It pairs with RClamp3371ZC (for SuperSpeed lanes) and uClamp2411ZA (for CC/SBU lines). SM75F handles the high-energy VBUS transients, while the others manage low-capacitance signal-line protection - forming a complete, validated EOS solution.
What is the maximum operating temperature range for SM75F?
SM75F is specified for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage and leakage current remain stable across this full range, as confirmed by characterization data in the official datasheet. Junction temperature can reach +150°C, supporting use in sealed enclosures and thermally constrained industrial deployments.
SM75F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 7500 V
- Current - Average Rectified (Io):
- 290mA
- Voltage - Forward (Vf) (Max) @ If:
- 12 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 300 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 7500 V
- Capacitance @ Vr, F:
- 3pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
SM75F FAQ
1.How can I place an order for SM75F through Aetrix?
Please submit a Request for Quotation (RFQ) for SM75F 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 SM75F reliable?
The price and inventory of SM75F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM75F is usually 5 days.
3.What payment methods are accepted for SM75F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM75F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM75F?
SM75F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM75F 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 SM75F?
For technical support, including SM75F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM75F requirements.
6.How does Aetrix verify that SM75F is sourced from the original manufacturer or authorized distributors?
All SM75F 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 SM75F meets industry standards.
7.What is the process for return or replacement of SM75F?
All SM75F units undergo pre-shipment inspection (PSI). If there is an issue with SM75F, 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 SM75F part is unused and in its original packaging.
Return procedure for SM75F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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