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Semtech Corporation 1N6173
- Part No.:
- 1N6173
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6173.pdf
- Description:
- TVS DIODE 152VWM 286VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,702
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Product details
Overview
1N6173 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 1N6173 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature, functional comparison vs. conventional TVS diodes, and real-world use cases in USB Type-C and load switch protection circuits.
Technical Context
The 1N6173 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 standard TVS diodes, its clamping voltage remains nearly constant (27.5–28V) across 24–40A peak pulse current and −40°C to +125°C operating temperature due to decreasing RDS(on) under surge.
It operates with three input terminals (Pins 4–6) tied together to the protected line and three ground terminals (Pins 1–3), requiring all six pins to be connected for full 40A rating. Its 175pF junction capacitance at 22V and 1MHz makes it suitable for DC power rail and low-speed signal line protection-not high-speed data lanes.
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 degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air per IEC 61000-4-2 - exceeds automotive and industrial ESD immunity standards without external shielding. |
| Dynamic Resistance | 20mΩ - enables stable clamping by minimizing voltage rise (ΔV = I × R) across full surge current range. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for VBus filtering but unsuitable for >100MHz signal lines like USB SS or PCIe. |
| Package | DFN 1.6mm × 1.6mm × 0.55mm, 6-lead - enables compact placement near connectors with minimal PCB area and thermal mass. |
Pinout & Package
1N6173 is housed in a Pb-free, RoHS-compliant 6-pin DFN package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required-energy is dissipated in the FET channel, not the junction. All pins must be soldered: Pins 1–3 are dedicated ground terminals; Pins 4–6 are parallel-connected input terminals for the protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | Ground (GND) | Low-inductance return path for surge current; all three must be connected to solid ground plane via multiple vias for full 40A capability. |
| Pins 4, 5, 6 | Input (IN) | Parallel-connected surge input node tied to protected bus (e.g., USB PD VBus); all three required to distribute current and minimize trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A and −40°C to +125°C-eliminates derating needed for TVS diodes at high temp or current. |
| FET-based shunt topology | Uses surge-rated MOSFET instead of PN junction; enables <0.1Ω effective RDS(on), reducing power dissipation and thermal stress vs. TVS. |
| High-energy surge handling | Rated for 1120W peak pulse power (8/20μs), enabling robust protection against lightning-induced surges in industrial equipment and remote meters. |
| Low-leakage design | Max 600nA reverse leakage at 22V - avoids battery drain in always-on IoT devices and preserves accuracy in precision power monitoring circuits. |
| Compact DFN footprint | 1.6mm × 1.6mm size saves >50% board space vs. SO-8 or SOT-23 TVS solutions rated for comparable 40A surge current. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the 20–22V VBus line of USB Type-C ports implementing Power Delivery, where controller ICs tolerate ≤24V absolute max. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or load switch, clamping surges before they reach sensitive silicon. Use Value: Maintains 27.5–28V clamping across temperature-prevents overvoltage damage to PD controllers even at 125°C ambient, unlike TVS diodes whose clamping rises >10V over same range. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in robotics, smart meters, and factory automation systems exposed to lightning or inductive switching transients. IC Role / Device Role / Timing Role: Primary front-end surge protector on VIN rail, limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Clamps to 28V at 40A-below typical 30V+ FET drain-source breakdown-ensuring load switch survives repeated 1kV/42Ω surges per IEC 61000-4-5 without latch-up or parametric shift. |
| IoT Device Power Rail Protection | Storage Device DC Power Input Protection |
|
Use Scenario: Securing 22V DC input rails of battery-backed IoT edge nodes deployed outdoors or in electrically noisy environments (e.g., EV charging stations, agricultural sensors). IC Role / Device Role / Timing Role: Standalone EOS protector on main power entry, coordinated with upstream fuse and downstream LDO to form complete fault-tolerant supply chain. Use Value: ±30kV ESD rating and 40A surge capacity enable single-device compliance with IEC 61000-4-2/4-4/4-5-reducing BOM count vs. multi-stage TVS + capacitor filters. |
Use Scenario: Protecting 22V auxiliary power inputs of NVMe SSD enclosures, NAS units, and enterprise storage controllers subject to hot-plug transients and backplane coupling. IC Role / Device Role / Timing Role: Fast-acting shunt device placed immediately after EMI filter and before DC-DC converter, preventing surge energy from propagating into regulation stage. Use Value: 175pF capacitance adds negligible loading to 22V rail-no need for additional series impedance or damping, preserving transient response of downstream converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A; higher clamping (35.5V), no temperature stability, 10× higher dynamic resistance (~200mΩ). | Used where cost is critical and 35.5V clamping is acceptable; requires derating above 85°C due to rising VC. | Select SMAJ22A only if system margin allows >7V headroom above 24V IC limits and ambient stays <70°C. |
| TDS2211P | Same family, identical specs and package-Semtech's official replacement part number for 1N6173; datasheet Rev 2.5 confirms functional equivalence and shared marking ("T22"). | No difference-designed as direct second-source with identical pinout, performance, and qualification. | Prefer TDS2211P for new designs; guaranteed long-term availability and full documentation support from Semtech. |
Compared with SMAJ22A and TDS2211P, the 1N6173 delivers superior clamping stability and lower dynamic resistance-critical for protecting 24V-rated ICs in thermally demanding or high-surge environments-while TDS2211P offers identical performance with updated branding and lifecycle assurance.
Availability
1N6173 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, IoT device power rails, and storage device DC inputs requiring stable component supply and proven surge resilience.
Supply support for 1N6173 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 in industrial, communications, and consumer markets.
The 1N6173 belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping, temperature insensitivity, and high surge endurance are mandatory.
FAQ
What is the exact clamping voltage of the 1N6173 at 40A surge current?
The 1N6173 clamps to 27.6–28V at 40A peak pulse current (8/20μs + 1.2/50μs combination waveform, 2Ω source impedance), as specified in the Electrical Characteristics table of Semtech's Rev 2.5 datasheet. This value remains stable across −40°C to +125°C, distinguishing it from TVS diodes whose clamping rises significantly with temperature.
Is the 1N6173 pin-compatible with standard TVS diodes in SOD-123 or SMA packages?
No-the 1N6173 uses a 6-pin DFN package (1.6mm × 1.6mm) with three parallel input pins (4–6) and three ground pins (1–3), requiring specific PCB layout with short, wide traces and multiple ground vias. It is not a drop-in replacement for 2-pin TVS diodes and demands dedicated land pattern per Semtech's outline drawing.
Can the 1N6173 be used to protect high-speed data lines like USB SuperSpeed or PCIe?
No-the 1N6173 has 175pF junction capacitance at 22V, which would severely degrade signal integrity on >100MHz differential pairs. It is intended exclusively for DC power rails and low-speed control lines; for USB SS or DP/DM, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
Does the 1N6173 require a thermal pad or heatsink for 40A surge handling?
No-unlike traditional TVS diodes, the 1N6173 dissipates surge energy in the FET channel rather than the PN junction, eliminating the need for thermal pads or copper pours. Semtech explicitly states "no thermal pad is needed" in the datasheet, as energy is handled via low-RDS(on) conduction, not junction heating.
How does the 1N6173 compare to the TDS2211P in terms of specifications and compatibility?
The 1N6173 and TDS2211P are functionally identical parts-Semtech's Rev 2.5 datasheet confirms shared electrical specs, package dimensions, pin configuration, and marking code ("T22"). TDS2211P is the updated orderable part number; both share the same DFN-6 footprint and performance, making them interchangeable in existing and new designs.
1N6173 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- Axial
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 152V (Max)
- Voltage - Breakdown (Min):
- 180V
- Voltage - Clamping (Max) @ Ipp:
- 286V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6173 FAQ
1.How can I place an order for 1N6173 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6173 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 1N6173 reliable?
The price and inventory of 1N6173 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6173 is usually 5 days.
3.What payment methods are accepted for 1N6173?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6173 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6173?
1N6173 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6173 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 1N6173?
For technical support, including 1N6173 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6173 requirements.
6.How does Aetrix verify that 1N6173 is sourced from the original manufacturer or authorized distributors?
All 1N6173 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 1N6173 meets industry standards.
7.What is the process for return or replacement of 1N6173?
All 1N6173 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6173, 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 1N6173 part is unused and in its original packaging.
Return procedure for 1N6173:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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