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Semtech Corporation 1N5554US
- Part No.:
- 1N5554US
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N5554US.pdf
- Description:
- DIODE GEN PURP 1KV 5A
- Quantity:
- Payment:
- Shipping:
Inventory:9,669
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Product details
Overview
1N5554US 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 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the 1N5554US datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specifications, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and direct alternative options for 22V bus protection in high-reliability embedded and power delivery systems.
Technical Context
The 1N5554US 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 threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with stable 22V reverse stand-off voltage, <600nA leakage at VRWM, and 175pF junction capacitance at 22V/1MHz - enabling robust protection without signal integrity degradation in high-speed or thermally demanding environments.
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) - ensures downstream ICs (e.g., USB PD controllers) remain below absolute maximum ratings during surge events. |
| 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 external shielding. |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot and minimal power dissipation during high-current transients. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with medium-speed data/power lines (e.g., VBUS, load switch inputs), not superspeed lanes. |
| Operating Temperature | –40°C to +125°C - supports operation in extended industrial and automotive under-hood environments. |
Pinout & Package
1N5554US is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals must be connected for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be soldered to solid ground plane with multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); all three pins are internally paralleled and must be shorted externally via low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage across 24–40A | 27.5–28V range maintained regardless of pulse amplitude - eliminates need for overrating IPP to meet voltage safety margins. |
| Stable clamping over temperature | No increase in VC from –40°C to +125°C - enables reliable protection in uncontrolled thermal environments without derating. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces I²R losses and localized heating during multi-pulse surge events. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in motor drives and PLC I/O. |
| DFN-6 footprint | 1.6mm × 1.6mm area - saves >60% board space vs. SO-8 or SOT-23 TVS solutions while supporting same 40A rating. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C PD ports against lightning surges, ESD, and hot-plug transients. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed immediately after connector, before PD controller and load switch. Use Value: Maintains 27.5–28V clamping at full 40A even at 125°C - prevents damage to USB PD controllers rated for ≤30V absolute max. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Shunt protector that diverts surge energy away from the load switch's internal FET gate oxide and drain-source junction. Use Value: Clamps below 28V, staying well under typical 30–40V FET drain-source breakdown - avoids catastrophic failure during 1kV/42Ω surges. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-device solution replacing multi-component TVS+RC networks for compact, high-reliability designs. Use Value: 175pF capacitance and ±30kV ESD rating enable direct placement without signal distortion or added filtering components. |
Use Scenario: Protecting 22V power inputs in NVMe SSD enclosures and enterprise storage backplanes. IC Role / Device Role / Timing Role: High-energy transient limiter on main power rail, coordinated with low-capacitance TVS on data lanes. Use Value: 1120W peak pulse power handling sustains repeated surge events in rack-mounted equipment without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN-6 package, identical marking (T22), same Semtech datasheet Rev 2.5 - confirmed pin-to-pin and functional replacement. | No difference; validated for identical USB PD, load switch, and industrial 22V bus use cases. | Select TDS2211P when requiring official Semtech part number traceability or specific tape-and-reel packaging (3,000/reel). |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs), 1000W PPPK; higher clamping, no temperature stability, larger SMA package. | Suitable only for lower-energy surges (<12A) where 35.5V clamping is acceptable; not recommended for USB PD or high-temp industrial use. | Choose SMAJ22A only for cost-sensitive, non-critical 22V lines with margin >13V above IC absolute max ratings. |
Compared with TDS2211P, 1N5554US offers identical performance and form factor but may differ in date-code marking or reel packaging; compared with SMAJ22A, 1N5554US delivers 8.5V lower clamping, 3.3× higher surge current, and stable voltage across temperature - making it essential for modern 22V power delivery systems.
Availability
1N5554US is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device 22V power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for 1N5554US 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 signal integrity.
The 1N5554US belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power and interface protection where stable clamping and thermal resilience are critical.
FAQ
What is the clamping voltage of the 1N5554US at 40A surge current?
The 1N5554US clamps at 27.5–28V under 40A peak pulse current (8/20μs waveform, 2Ω source impedance), as specified in the Electrical Characteristics table of its official datasheet. This value remains stable across –40°C to +125°C and is significantly lower than standard TVS diodes at equivalent current levels - directly protecting 30V-tolerant USB PD controllers and load switches.
Is the 1N5554US pin-compatible with TDS2211P?
Yes, the 1N5554US is pin-compatible with TDS2211P: both use the identical DFN-6 (1.6mm × 1.6mm) package with pins 1–3 as GND and pins 4–6 as IN. Functional diagrams, absolute maximum ratings, and electrical characteristics match exactly per Semtech documentation - confirming drop-in replacement capability without PCB modification.
Does the 1N5554US require a thermal pad on the PCB?
No, the 1N5554US does not require an exposed thermal pad or additional copper pour for thermal management. Its energy dissipation occurs within the silicon FET structure during transient events, and the datasheet explicitly states "no thermal pad is needed." Layout emphasis instead focuses on low-inductance grounding (multiple vias to solid ground plane) and short, direct traces to the protected connector.
Can the 1N5554US be used on high-speed data lines like USB SuperSpeed?
No, the 1N5554US is not suitable for USB SuperSpeed (SS), DisplayPort, or PCIe data lanes due to its 175pF junction capacitance at 22V - which would severely degrade signal integrity. It is intended exclusively for 22V power lines (VBUS, load switch inputs) and medium-speed control lines. For SS lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
What is the ESD rating of the 1N5554US and how is it tested?
The 1N5554US provides ±30kV ESD immunity per IEC 61000-4-2, tested in both contact and air discharge modes with the ESD gun return path connected to the system ground plane. This rating is verified across the full operating temperature range and reflects its solid-state FET-based architecture - delivering consistent protection without degradation after repeated strikes.
1N5554US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SQ-MELF
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 3 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1000 V
- Capacitance @ Vr, F:
- 92pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
1N5554US FAQ
1.How can I place an order for 1N5554US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5554US 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 1N5554US reliable?
The price and inventory of 1N5554US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5554US is usually 5 days.
3.What payment methods are accepted for 1N5554US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5554US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5554US?
1N5554US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5554US 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 1N5554US?
For technical support, including 1N5554US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5554US requirements.
6.How does Aetrix verify that 1N5554US is sourced from the original manufacturer or authorized distributors?
All 1N5554US 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 1N5554US meets industry standards.
7.What is the process for return or replacement of 1N5554US?
All 1N5554US units undergo pre-shipment inspection (PSI). If there is an issue with 1N5554US, 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 1N5554US part is unused and in its original packaging.
Return procedure for 1N5554US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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