My Inquiry
My Account
Semtech Corporation 1N6149
- Part No.:
- 1N6149
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6149.pdf
- Description:
- TVS DIODE 15.2VWM 29VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N6149 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 24–40A, 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 1N6149 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability across temperature and pulse current, dynamic resistance ≤20mΩ, junction capacitance of 175pF at 22V, and validated use in 22V bus protection where conventional TVS diodes exhibit rising VC with IPP and temperature.
Technical Context
The 1N6149 implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt FET when transient voltage exceeds breakdown threshold. Unlike standard 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, maintains <600nA reverse leakage at 22V, and delivers 1120W peak pulse power (8/20μs). Its functional architecture separates trigger and conduction paths, enabling stable clamping independent of ambient temperature - a critical advantage over junction-limited TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage of protected line without triggering |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage thresholds |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity mandates |
| Dynamic Resistance | 20mΩ (8/20μs, 1–40A range) - enables low-voltage-drop conduction during surge, minimizing energy dissipation in silicon |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with 22V power rail protection; not suitable for high-speed data lines |
| Package | DFN 1.6×1.6×0.55mm, 6-lead - enables compact placement near connectors with minimal PCB area (2.56 mm² footprint) |
Pinout & Package
1N6149 is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required (energy dissipated in FET channel, not junction). All pins must be connected: Pins 1–3 are GND; Pins 4–6 are IN (parallel-connected input terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be vias-connected to solid ground plane for full 40A surge capability |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected bus; must be routed as single straight trace from connector to maximize surge handling |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A pulse range and −40°C to +125°C - eliminates derating uncertainty vs. temperature-dependent TVS |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - enables sub-0.1Ω effective RDS(on), reducing thermal stress vs. PN-junction TVS |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated industrial lightning surge events without degradation |
| Low dynamic resistance | 20mΩ - minimizes IR drop during surge, preserving voltage margin for downstream 22V-tolerant ICs |
| Compact DFN footprint | 1.6×1.6mm - saves >60% board space vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge energy |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB-C PD ports operating up to 20V nominal, exposed to ESD and ±1kV surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller/load switch input. Use Value: Maintains clamping at ≤28V across temperature and full surge range - prevents overvoltage damage to 22V-max PD controllers where standard TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes. IC Role / Device Role / Timing Role: Front-end transient diverter limiting voltage seen by internal FET gate oxide and drain-source junction. Use Value: Clamps transients before they reach the load switch's absolute maximum ratings - avoids latch-up or permanent failure during field-deployed surge exposure. |
| 22V Industrial Power Rail Protection | IoT Device DC Input Surge Suppression |
Use Scenario: Securing 22V auxiliary rails in programmable logic controllers (PLCs), motor drives, and sensor hubs against coupling-induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on unregulated 22V supply input prior to DC-DC conversion. Use Value: Delivers 40A surge handling with stable 28V clamping - enables robust design without oversized TVS or redundant protection stages. |
Use Scenario: Protecting battery-charged or adapter-powered IoT endpoints (e.g., smart sensors, gateways) with 22V-rated inputs in harsh EMI environments. IC Role / Device Role / Timing Role: First-line defense against ESD, EFT, and lightning-induced surges entering via external power jack or terminal block. Use Value: Combines ±30kV ESD, ±4kV EFT, and 40A surge immunity in ultra-small DFN - ideal for space-constrained, battery-sensitive designs requiring long-term reliability. |
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 (8/20μs); higher dynamic resistance (~0.5Ω); clamping rises with temperature and current | Limited to lower-energy surges; unsuitable for sustained 40A events or high-temp industrial operation where clamping must stay ≤28V | Select only if cost sensitivity outweighs clamping stability and surge margin requirements |
| TDS2211P | Same manufacturer, identical function and specs; 1N6149 is Semtech's alternate ordering designation for TDS2211P per official product documentation | No functional difference - same DFN package, pinout, electrical behavior, and qualification | Direct form-fit-function replacement; identical sourcing, traceability, and lifecycle status |
Compared with SMAJ22A, 1N6149 provides 9V lower clamping at rated current and stable performance across temperature, while TDS2211P is an identical part under alternate marking - making 1N6149 the optimal choice for designs demanding predictable, high-energy 22V rail protection.
Availability
1N6149 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V power rail protection requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 1N6149 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 semiconductors for power management, protection, sensing, and signal integrity.
The 1N6149 belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection where clamping voltage stability under surge and temperature is critical.
FAQ
What is the exact function of the 1N6149 in a circuit?
The 1N6149 functions as a transient diverting suppressor that actively shunts high-energy EOS events - including ESD, EFT, and lightning surges - away from sensitive downstream components. It uses a precision-triggered FET to clamp the protected line at a stable 27.5–28V, regardless of surge amplitude (24–40A) or operating temperature (−40°C to +125°C). This behavior distinguishes it from passive TVS diodes and makes the 1N6149 especially valuable in 22V USB PD and industrial power rail applications.
Is the 1N6149 pin-compatible with standard TVS diodes like SMAJ22A?
No, the 1N6149 is not pin-compatible with SMAJ22A or other 2-pin TVS diodes. It uses a 6-pin DFN package with three parallel input pins (4–6) and three parallel ground pins (1–3), requiring dedicated PCB layout with multi-pin routing and ground vias. SMAJ22A uses DO-214AC (SMA) packaging with anode/cathode configuration. Direct substitution would require board redesign - the 1N6149 is a system-level upgrade, not a drop-in replacement.
Does the 1N6149 require a thermal pad or heatsink on the PCB?
No, the 1N6149 does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy in the channel rather than the PN junction, eliminating thermal hotspot concerns typical of TVS diodes. The datasheet explicitly states "no thermal pad is needed," and recommended layout focuses on low-inductance grounding (multiple vias to ground plane) and short, direct traces - not thermal mass.
What is the significance of the 20mΩ dynamic resistance specification for the 1N6149?
The 20mΩ dynamic resistance (RDYN) of the 1N6149 reflects the effective on-resistance of its internal shunt FET under surge conditions. This ultra-low value ensures minimal IR voltage rise during high-current transients - keeping clamping tightly controlled at ~28V even at 40A. In contrast, standard TVS diodes exhibit fixed, much higher dynamic resistance (e.g., 0.5Ω), causing clamping voltage to scale linearly with current. That makes the 1N6149 uniquely suited for protecting 22V systems where voltage margin is narrow.
Can the 1N6149 be used on high-speed data lines such as USB SuperSpeed or PCIe?
No, the 1N6149 is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V is optimized for power rail and low-frequency I/O protection - far exceeding the <0.5pF requirement for USB 3.x or PCIe Gen3+ signal integrity. For those applications, Semtech recommends complementary low-capacitance TVS devices like RClamp3371ZC (<0.25pF). The 1N6149 should be reserved for 22V VBus, CC/SBU, or load switch input protection where bandwidth is not a constraint.
1N6149 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):
- 15.2V (Max)
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29V
- Current - Peak Pulse (10/1000µs):
- 51.7A
- 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
1N6149 FAQ
1.How can I place an order for 1N6149 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6149 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 1N6149 reliable?
The price and inventory of 1N6149 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6149 is usually 5 days.
3.What payment methods are accepted for 1N6149?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6149 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6149?
1N6149 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6149 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 1N6149?
For technical support, including 1N6149 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6149 requirements.
6.How does Aetrix verify that 1N6149 is sourced from the original manufacturer or authorized distributors?
All 1N6149 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 1N6149 meets industry standards.
7.What is the process for return or replacement of 1N6149?
All 1N6149 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6149, 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 1N6149 part is unused and in its original packaging.
Return procedure for 1N6149:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6149 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
