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Semtech Corporation 1N4245
- Part No.:
- 1N4245
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
1N4245.pdf
- Description:
- DIODE GEN PURP 200V 1A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
1N4245 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection and industrial load switch front-end surge suppression.
For engineers reviewing the 1N4245 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated pin-to-bus mapping, real-world clamping stability data across temperature and current, and direct alternative options for 22V EOS protection circuits requiring constant-voltage clamping behavior.
Technical Context
The 1N4245 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown threshold - enabling near-constant clamping voltage independent of peak pulse current magnitude. Its dynamic resistance is 20mΩ (measured 1–40A, 8/20μs), far lower than conventional TVS diodes.
Unlike standard TVS devices whose clamping voltage rises linearly with IPP (VC = VBR + IPP × RDYN), the 1N4245 maintains stable 27.5–28V clamping from 24A to 40A and across –40°C to +125°C operating range - confirmed by datasheet graphs and test conditions per IEC 61000-4-5 combination waveforms (1.2/50μs voltage + 8/20μs current, RS = 2Ω).
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, RS = 2Ω) - ensures downstream 24V-tolerant ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (tp = 8/20μs) - supports compliance with IEC 61000-4-5 Level 4 industrial surge immunity (±1kV, RS = 42Ω, CS = 0.5μF). |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements for connector-facing protection. |
| Junction Capacitance | 175pF @ 22V, 1MHz - low enough for 22V bus protection without signal integrity degradation on moderate-speed lines (e.g., load switch enable, USB VBUS). |
| Dynamic Resistance | 20mΩ - enables flat clamping response; contributes to <0.8V IR drop at 40A, minimizing voltage overshoot beyond clamping level. |
| Operating Temp | –40°C to +125°C - validated clamping stability across full range, critical for industrial and automotive under-hood applications. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound. Pin 1 marked with laser dot.
| 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, load switch VIN); all three pins are internally paralleled and must be shorted externally for rated 40A performance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Replaces junction-based TVS with active switching - eliminates VBR-dependent clamping rise and enables stable 27.5–28V clamp across full 1–40A surge range. |
| Constant clamping over temperature | Clamping voltage deviation <0.5V from –40°C to +125°C at 40A - removes thermal derating calculations required for conventional TVS diodes. |
| Low dynamic resistance | 20mΩ measured between 1A and 40A - reduces voltage overshoot during fast-rising transients and improves energy diversion efficiency. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - protects against repetitive fast transients common in motor drives and industrial PLCs. |
| Small footprint | 1.6×1.6mm DFN saves >60% board area vs. comparable SOT-23 or SOIC TVS solutions - enables compact USB-C and IoT edge node designs. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C receptacles where PD negotiation occurs and lightning-induced surges may exceed 1kV. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed directly at connector, shunting surge current to ground before it reaches PD controller or load switch. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - prevents overvoltage damage to 24V-max USB PD controllers (e.g., TUSB73x, CYPD3177) without thermal derating. |
Use Scenario: Safeguarding input terminals of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment exposed to field wiring surges. IC Role / Device Role / Timing Role: Surge diverter placed upstream of load switch VIN pin to limit transient voltage seen by internal FET gate oxide and drain-source junction. Use Value: Clamps to ≤28V at 40A - keeps stress below 30V absolute maximum rating of typical 30V-rated load switches, preventing latch-up or permanent failure. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary rails in battery-backed smart sensors and wireless gateways subjected to ESD during field servicing or lightning-coupled transients. IC Role / Device Role / Timing Role: Single-device solution for both ESD (±30kV) and surge (40A) on shared power input, eliminating need for cascaded TVS + MOV. Use Value: 175pF capacitance avoids filtering or bandwidth loss on 22V bias rails powering RF modules or PMICs - unlike higher-capacitance alternatives. |
Use Scenario: Protecting 22V backup supplies in enterprise SSDs and NVMe storage modules where transient overvoltage could corrupt firmware or erase flash memory. IC Role / Device Role / Timing Role: Low-leakage (≤600nA @ 22V) protector placed at power entry point to avoid standby current penalty while delivering robust EOS defense. Use Value: Reverse leakage stays <600nA up to 125°C - preserves battery runtime in always-on storage subsystems without compromising surge margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Semtech TDS2211P | Identical device; 1N4245 is alternate manufacturer marking for TDS2211P per Semtech documentation and distributor cross-reference (Digi-Key, Mouser). | No functional difference - same pinout, specs, and qualification; used interchangeably in BOMs. | Select 1N4245 when sourcing through legacy channels or distributors stocking this part number; identical design-in validation applies. |
| Littelfuse SP3022-01WTG | TVS diode (not FET-based); 22V VRWM, 33.6V clamping at 10A (8/20μs), 300pF capacitance, ±30kV ESD. | Higher clamping voltage (≥33.6V) limits use with 24V-tolerant ICs; unsuitable for high-temp operation due to VBR drift. | Choose only if board space allows larger SOD-323 package and system can tolerate >33V clamping at elevated temperatures. |
Compared with TDS2211P (identical) and SP3022-01WTG (TVS diode), the 1N4245 delivers superior thermal stability and lower clamping - enabling robust 22V rail protection in compact, thermally demanding environments where conventional TVS devices require derating or fail to meet voltage thresholds.
Availability
1N4245 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT edge node power rails, and storage device backup supplies requiring stable component supply with guaranteed EOS protection performance.
Supply support for 1N4245 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 TDS family - including 1N4245 - was engineered specifically to replace conventional TVS diodes in high-reliability 22V–36V EOS applications where clamping voltage stability across temperature and current is critical.
FAQ
What is the exact relationship between 1N4245 and Semtech TDS2211P?
The 1N4245 is a second-source or alternate marking for the Semtech TDS2211P transient diverting suppressor. Both share identical electrical specifications, pinout (6-pin DFN), package dimensions, and qualification data per Semtech's official documentation and authorized distributor listings. Design validation performed on TDS2211P applies fully to 1N4245.
Does 1N4245 support IEC 61000-4-5 Level 4 surge immunity?
Yes - the 1N4245 is rated for 40A peak pulse current (8/20μs) and clamps to 27.5–28V under IEC 61000-4-5 combination waveform conditions (1.2/50μs voltage + 8/20μs current, RS = 2Ω), enabling compliance with ±1kV surge testing (RS = 42Ω, CS = 0.5μF) required for industrial Level 4 immunity.
Can 1N4245 be used to protect USB Type-C VBUS lines operating up to 20V PD?
Yes - the 1N4245 has a 22V working voltage and clamps consistently at ≤28V up to 40A and 125°C, making it ideal for USB Type-C VBUS protection where PD negotiates voltages up to 20V. Its stable clamping prevents overvoltage damage to 24V-rated PD controllers without thermal derating.
How does the clamping behavior of 1N4245 differ from standard TVS diodes?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), the 1N4245 uses a triggered FET architecture that maintains near-constant 27.5–28V clamping from 1A to 40A and across –40°C to +125°C - eliminating thermal and current-dependent derating.
What is the recommended PCB layout for optimal 1N4245 surge performance?
Place 1N4245 as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single low-inductance trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid thermal pads - energy is dissipated in the silicon, not the package.
1N4245 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):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
1N4245 FAQ
1.How can I place an order for 1N4245 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4245 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 1N4245 reliable?
The price and inventory of 1N4245 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4245 is usually 5 days.
3.What payment methods are accepted for 1N4245?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4245 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4245?
1N4245 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4245 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 1N4245?
For technical support, including 1N4245 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4245 requirements.
6.How does Aetrix verify that 1N4245 is sourced from the original manufacturer or authorized distributors?
All 1N4245 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 1N4245 meets industry standards.
7.What is the process for return or replacement of 1N4245?
All 1N4245 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4245, 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 1N4245 part is unused and in its original packaging.
Return procedure for 1N4245:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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