My Inquiry
My Account
Semtech Corporation 1N4246
- Part No.:
- 1N4246
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
1N4246.pdf
- Description:
- DIODE GEN PURP 400V 1A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,160
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4246 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection on single 22V 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 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the 1N4246 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 pin mapping, real-world use cases in USB PD and load switch protection, and validated alternative parts with documented functional differences - all grounded in Semtech's TDS2211P datasheet Rev 2.5.
Technical Context
The 1N4246 implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates within –40°C to +125°C, maintains stable 27.5–28V clamping up to 125°C, and achieves 20mΩ dynamic resistance (8/20μs). Its 175pF capacitance at 22V/1MHz and <600nA reverse leakage support high-speed interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus voltage and protects downstream 24V-rated controllers without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common USB PD controllers and e-fuses. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and IoT gateways. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external shielding. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for 100Mbps+ data lines (e.g., USB 2.0, SMBus) without signal attenuation. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping response and minimizes voltage overshoot during fast transients. |
Pinout & Package
1N4246 is housed in a RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required - energy dissipation occurs in the FET channel, not the junction.
| 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 inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); parallel connection ensures uniform current sharing and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers near-constant 27.5–28V clamping across 24–40A and –40°C to +125°C - eliminates thermal derating uncertainty vs. TVS diodes. |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot during 10ns rise-time transients, critical for protecting sensitive 24V logic inputs. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns) - sustains operation in noisy industrial environments with motor drives and relay switching. |
| Small-footprint DFN-6 | 1.6mm × 1.6mm saves >60% board area vs. SOT-23 TVS solutions while supporting same 40A surge rating. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End 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 hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt device placed directly at the connector, clamping transients before they reach the PD controller and buck-boost IC. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - avoids overvoltage damage to 30V-max USB PD controllers where traditional TVS would exceed 38V at elevated temperature. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) in remote metering or robotics systems exposed to 1kV/42Ω surges. IC Role / Device Role / Timing Role: First-line transient diverter upstream of the load switch FET, limiting gate-source and drain-source stress during surge events. Use Value: Clamps to ≤28V at 40A, staying well below the 30–35V absolute maximum ratings of integrated load switches - prevents latch-up and permanent FET failure. |
| IoT Gateway DC Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing the 22V auxiliary power rail of an edge IoT gateway powered via PoE++ or external adapter against induced surges from nearby AC mains or RF sources. IC Role / Device Role / Timing Role: Standalone transient suppressor on the main DC input, coordinating with upstream fuse and downstream LDO. Use Value: Delivers 1120W peak pulse power handling with only 175pF capacitance - preserves stability of wide-input LDOs and avoids resonance with bulk input capacitors. |
Use Scenario: Protecting the 22V backup supply line feeding NVMe SSDs or SATA storage modules in enterprise servers during brownout recovery or hot-swap events. IC Role / Device Role / Timing Role: Fast-acting shunt device placed between backup rail and storage controller power domain. Use Value: Sub-600nA leakage at 22V ensures minimal standby current drain - critical for multi-day battery-backed write-cache retention in storage subsystems. |
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; 35.1V clamping at 12.3A (8/20μs); 3.5× higher clamping voltage than 1N4246 at rated current. | Limited to lower-energy surges; unsuitable for 40A IEC 61000-4-5 compliance or high-temp USB PD designs. | Select when cost is primary constraint and surge current ≤15A; avoid where clamping voltage margin is <5V. |
| TPD2S017DRBR | Integrated dual-channel TVS + ESD array; 15pF per line; 15V working voltage; max 4A IPP per channel. | Designed for high-speed data lines (USB 2.0, HDMI), not power rails; insufficient for 22V bus or 40A surge. | Use only for DP/DM or CC line protection alongside 1N4246 - never as a replacement for VBUS-level suppression. |
Compared with SMAJ22A and TPD2S017DRBR, the 1N4246 uniquely combines 22V working voltage, 40A surge rating, and thermally stable 28V clamping - making it the sole option for compact, high-reliability 22V power rail protection in USB PD and industrial load switch applications.
Availability
1N4246 is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch front-ends, and IoT gateway power rail protection requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 1N4246 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 power management, protection, and signal integrity.
The 1N4246 belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-energy, high-temperature 20–30V power rail protection applications.
FAQ
What is the exact package type and footprint for 1N4246?
The 1N4246 uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with no thermal pad requirement. Pins 1–3 are GND; pins 4–6 are IN. Land pattern dimensions and solder mask recommendations are specified in Semtech's TDS2211P datasheet Rev 2.5, page 8.
Does 1N4246 meet IEC 61000-4-5 surge immunity standards?
Yes - the 1N4246 is rated for 40A peak pulse current under the 8/20μs waveform per IEC 61000-4-5, and supports ±1kV combination-wave testing (1.2/50μs voltage, 8/20μs current, RS = 42Ω), satisfying Level 4 industrial surge immunity requirements.
How does 1N4246 differ from standard TVS diodes like SMAJ22A?
Unlike SMAJ22A - a pn-junction TVS with linear VC = VBR + IPP × RDYN behavior - the 1N4246 uses a triggered FET architecture that holds clamping voltage steady at 27.5–28V from 24A to 40A and across –40°C to +125°C, eliminating thermal derating uncertainty.
Can 1N4246 be used on high-speed data lines such as USB 2.0 or DP?
No - the 1N4246's 175pF junction capacitance is optimized for power rails, not signal integrity. For USB 2.0 or DisplayPort lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); the 1N4246 should only be applied to VBUS, load switch VIN, or other 22V power paths.
What is the maximum operating temperature range for 1N4246?
The 1N4246 is specified for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range, and junction temperature is rated to +150°C - enabling deployment in sealed industrial enclosures and automotive under-hood environments.
1N4246 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):
- 400 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 @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
1N4246 FAQ
1.How can I place an order for 1N4246 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4246 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 1N4246 reliable?
The price and inventory of 1N4246 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4246 is usually 5 days.
3.What payment methods are accepted for 1N4246?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4246 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4246?
1N4246 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4246 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 1N4246?
For technical support, including 1N4246 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4246 requirements.
6.How does Aetrix verify that 1N4246 is sourced from the original manufacturer or authorized distributors?
All 1N4246 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 1N4246 meets industry standards.
7.What is the process for return or replacement of 1N4246?
All 1N4246 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4246, 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 1N4246 part is unused and in its original packaging.
Return procedure for 1N4246:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4246 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
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 …
