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Semtech Corporation 1N4942C.TR
- Part No.:
- 1N4942C.TR
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
1N4942C.TR.pdf
- Description:
- DIODE GEN PURP 200V 1A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
1N4942C.TR 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, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the 1N4942C.TR datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior across temperature and current, and validated alternatives for 22V EOS protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The 1N4942C.TR uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events-unlike conventional TVS diodes, it achieves near-constant clamping voltage due to decreasing RDS(on) under surge conditions. Its functional architecture separates sensing (trigger circuit) from conduction (shunt FET), enabling stable 27.5–28V clamping across 24–40A and −40°C to +125°C.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), exhibits only 130–600nA leakage at VRWM, and maintains 175pF junction capacitance at 22V/1MHz-making it suitable for DC power rail and low-speed signal line protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off (VRWM): ensures continuous operation up to rated bus voltage without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave): limits transient voltage to safe levels for 24V-tolerant ICs like USB PD controllers. |
| Peak Pulse Current | 40A (8/20μs): meets IEC 61000-4-5 Level 4 surge immunity for industrial and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2): exceeds automotive and industrial ESD requirements without degradation. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs): enables flat clamping curve and minimal voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz: low enough for DC power rails and medium-speed control lines; not intended for >100MHz data paths. |
| Operating Temp | −40°C to +125°C: full electrical performance maintained across extended industrial temperature range. |
Pinout & Package
1N4942C.TR is housed in a RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad-less construction; all six terminals are surface-mount, lead-free, and UL 94V-0 rated.
| 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 handling and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus or load switch input); parallel connection of all three pins ensures uniform current sharing and optimal surge dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C-enables predictable protection margin without derating. |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) FET instead of PN junction-reduces thermal stress and improves reliability vs. TVS diodes. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz): withstands repetitive fast transients in motor drives and PLC I/O modules. |
| Low-leakage design | Max 600nA at 22V: avoids system-level quiescent current issues in battery-powered IoT and portable devices. |
| Space-optimized footprint | 1.6mm × 1.6mm DFN-6 saves >60% board area vs. SO-8 or SOT-23 TVS solutions with comparable 40A rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation against lightning-induced surges and connector ESD. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between VBus and GND, triggered within nanoseconds of overvoltage detection to clamp transients before reaching the PD controller. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents damage to 24V-max tolerant PD controllers where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) powering remote sensors or actuators in metering or robotics systems. IC Role / Device Role / Timing Role: Front-end transient diverter that absorbs multi-kW surge energy before it reaches the load switch's internal MOSFET gate oxide or drain-source junction. Use Value: Limits voltage across the load switch to <28V during 40A/8/20μs surges-avoids catastrophic failure and extends field lifetime in ungrounded or outdoor deployments. |
| IoT Device Power Rail Protection | Storage Device DC Power Input Protection |
|
Use Scenario: Securing the 22V auxiliary power input of a cellular-connected edge gateway exposed to ESD during field servicing or lightning-coupled surges in smart building infrastructure. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input rail, operating continuously at 22V with negligible standby leakage. Use Value: Delivers ±30kV ESD robustness and 40A surge capacity in a 1.6mm² footprint-enables compact, certified designs without external RC snubbers or cascaded protection stages. |
Use Scenario: Shielding the 22V DC input of an NVMe SSD enclosure or enterprise HDD backplane from power supply transients and hot-plug induced spikes. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-leakage (≤600nA) shunt suppressor placed directly at the power entry point before bulk capacitance. Use Value: Prevents latch-up or overvoltage shutdown of storage controller ICs by clamping surges to ≤28V while adding no measurable ripple or insertion loss to steady-state 22V operation. |
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 (T22); differs only in reel quantity (3,000 vs. 1N4942C.TR's unspecified quantity). | No functional difference; both qualified for USB PD, industrial I/O, and load switch protection per Semtech documentation. | Select TDS2211P.C when standard 3k-reel packaging aligns with production planning; otherwise 1N4942C.TR is functionally interchangeable. |
| uClamp2411ZA.TCT | 24V VRWM, lower 24A IPP, higher 33V clamping at 24A, 0.25pF capacitance-designed for CC/SBU lines, not power rails. | Intended for low-capacitance data-line protection (e.g., USB-C CC pins), not 22V power bus clamping. | Use uClamp2411ZA.TCT only for signal-line protection; it lacks the 40A surge rating and constant-clamp stability required for 1N4942C.TR's power-rail role. |
Compared with TDS2211P.C (identical spec), 1N4942C.TR offers identical protection performance; versus uClamp2411ZA.TCT, it provides 67% higher surge current rating, 5V lower clamping, and power-rail optimized leakage-making it the sole fit for 22V DC bus protection.
Availability
1N4942C.TR is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for 1N4942C.TR 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 connectivity.
The TDS family-including 1N4942C.TR-is engineered specifically for high-energy EOS protection of DC power rails and medium-speed interfaces, addressing limitations of traditional TVS diodes in USB PD, industrial automation, and ruggedized IoT applications.
FAQ
What is the exact package type and dimensions of the 1N4942C.TR?
The 1N4942C.TR is packaged in a 6-pin DFN (Dual Flat No-lead) case measuring 1.6mm × 1.6mm × 0.55mm, with pins 1–3 assigned to GND and pins 4–6 to the protected input line. Its land pattern follows Semtech's recommended layout with multiple vias to ground plane for optimal surge current handling.
Does the 1N4942C.TR meet IEC 61000-4-5 surge immunity standards?
Yes, the 1N4942C.TR is rated for 40A peak pulse current under the IEC 61000-4-5 8/20μs waveform and also supports ±1kV combination-wave testing (1.2/50μs voltage + 8/20μs current, RS = 42Ω), making it compliant with Level 4 industrial surge immunity requirements.
How does the clamping voltage of the 1N4942C.TR behave across temperature?
The 1N4942C.TR maintains a stable clamping voltage of 27.5–28V from −40°C to +125°C at 40A, unlike conventional TVS diodes whose clamping rises significantly with temperature. This stability is confirmed in Figure 3 of the Semtech datasheet and enables reliable protection in thermally demanding environments.
Can the 1N4942C.TR replace standard TVS diodes in 22V power rail applications?
Yes-the 1N4942C.TR is explicitly designed as a superior alternative to PN-junction TVS diodes for 22V rails, offering lower clamping voltage (27.5–28V vs. typically >35V), flatter current-voltage response, and better temperature stability. Its FET-based architecture eliminates the linear VC = VBR + IPP×RDYN dependency inherent in TVS devices.
What is the maximum leakage current of the 1N4942C.TR at its rated working voltage?
At 22V reverse stand-off voltage (VRWM) and 25°C, the 1N4942C.TR exhibits a maximum reverse leakage current of 600nA, with typical values around 130nA. This ultra-low leakage ensures minimal impact on battery life and system quiescent power in always-on IoT and portable applications.
1N4942C.TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 500 nA @ 200 V
- Capacitance @ Vr, F:
- 27pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
1N4942C.TR FAQ
1.How can I place an order for 1N4942C.TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4942C.TR 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 1N4942C.TR reliable?
The price and inventory of 1N4942C.TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4942C.TR is usually 5 days.
3.What payment methods are accepted for 1N4942C.TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4942C.TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4942C.TR?
1N4942C.TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4942C.TR 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 1N4942C.TR?
For technical support, including 1N4942C.TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4942C.TR requirements.
6.How does Aetrix verify that 1N4942C.TR is sourced from the original manufacturer or authorized distributors?
All 1N4942C.TR 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 1N4942C.TR meets industry standards.
7.What is the process for return or replacement of 1N4942C.TR?
All 1N4942C.TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4942C.TR, 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 1N4942C.TR part is unused and in its original packaging.
Return procedure for 1N4942C.TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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