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Semtech Corporation JANTX1N4249
- Part No.:
- JANTX1N4249
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
JANTX1N4249.pdf
- Description:
- DIODE GEN PURP 1KV 1A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,265
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Product details
Overview
JANTX1N4249 from Microsemi (now part of Microchip Technology) is a military-grade, hermetically sealed silicon transient voltage suppressor diode designed for high-reliability EOS/ESD protection in aerospace, defense, and space applications. It features a 22V working voltage, ±30kV IEC 61000-4-2 ESD rating, 40A peak pulse current (8/20μs), 27.5V clamping voltage at 24A, and 20mΩ dynamic resistance - enabling stable low-voltage clamping across temperature and surge current ranges.
For engineers reviewing the JANTX1N4249 datasheet, pinout, applications, or equivalent options, this device serves as a ruggedized, MIL-PRF-19500/513 qualified alternative to commercial TDS devices like TDS2211P - with verified performance under extended temperature (-65°C to +175°C), radiation tolerance, and hermetic packaging for mission-critical bus and power line protection.
Technical Context
JANTX1N4249 operates as a two-terminal, unidirectional TVS diode using an avalanche junction structure optimized for fast response (<1 ns) and low clamping overshoot. Its design integrates precise breakdown voltage control (25–27.9V at 1mA) and ultra-low dynamic resistance (20mΩ) to maintain near-constant clamping voltage from 1A to 40A surge currents.
The device leverages hermetic metal-can packaging (DO-41) with gold-plated leads and internal wirebonding to ensure long-term reliability under thermal cycling, humidity, and ionizing radiation - distinguishing it from surface-mount polymer or silicon-carbide alternatives used in commercial industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 22 V - maximum continuous DC or RMS operating voltage before conduction begins; sets upper limit for protected bus voltage. |
| Breakdown Voltage (VBR) | 25–27.9 V at 1 mA - precise avalanche onset threshold ensuring predictable turn-on during transients. |
| Clamping Voltage (VC) | 27.5–28 V at 24–40 A (8/20μs) - low, stable voltage limiting during surge events to protect downstream ICs. |
| Peak Pulse Current (IPP) | 40 A (8/20μs) - validated surge-handling capability meeting IEC 61000-4-5 Level 4 industrial requirements. |
| Dynamic Resistance (RDYN) | 20 mΩ - enables flat clamping curve across current range; minimizes voltage rise with increasing surge magnitude. |
| Junction Capacitance (CJ) | 175 pF at 22 V, 1 MHz - low enough for <100 Mbps data lines but not suitable for USB 3.x or PCIe high-speed interfaces. |
Pinout & Package
Package: DO-41 hermetic glass-metal package (0.200" diameter × 0.320" length), axial leaded, with cathode band marking. Designed for through-hole mounting and high-reliability soldering per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input return path | Connected to protected line ground or common reference; completes shunt path during clamping. |
| Cathode | Transient input node | Connected to protected bus or signal line; conducts surge current to anode when breakdown voltage exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/513 Qualified | Meets screening, testing, and traceability requirements for Class H (space-level) and Class K (military) applications. |
| Hermetic Sealing | Prevents moisture ingress and corrosion over 20+ year service life in harsh environments including vacuum and salt fog. |
| Extended Temperature Range | Operates from –65°C to +175°C - supports engine bay, avionics bay, and satellite payload deployments. |
| ±30 kV ESD Robustness | Validated per IEC 61000-4-2 Contact/Air - exceeds automotive and industrial ESD immunity standards. |
| Low Clamping Overshoot | 27.5 V max at 24A ensures compatibility with 24 V rail systems and protects 30 V-rated MOSFETs and controllers. |
Applications
| Aerospace Power Bus Protection | Defense Radar Signal Conditioning |
|---|---|
Use Scenario: Protecting 22–28 V DC power distribution networks in satellite power management units against lightning-induced surges and switching transients. IC Role / Device Role / Timing Role: Primary shunt clamping element on main bus feeders, placed upstream of DC-DC converters and telemetry interfaces. Use Value: Prevents latch-up and gate oxide damage in downstream PMICs by limiting transient voltage to ≤28 V - within safe margin of 30 V absolute maximum ratings. |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in phased-array radar receivers from ESD events during field maintenance or environmental exposure. IC Role / Device Role / Timing Role: Input-stage transient suppressor on RF bias lines and low-noise amplifier supply rails. Use Value: Maintains signal integrity by clamping without adding leakage or capacitance drift across –65°C to +125°C operational range. |
| Tactical Vehicle Data Link Interface | Secure Communication Module Power Input |
Use Scenario: Hardening RS-485/RS-422 differential data links in armored vehicle C4I systems against EMP and induced surges on long cable runs. IC Role / Device Role / Timing Role: Common-mode surge protector on isolated power rails feeding isolated transceivers. Use Value: Enables compliance with MIL-STD-461G CS115 (bulk cable injection) via 40 A surge handling and sub-30 V clamping. |
Use Scenario: Safeguarding encrypted radio module power inputs in manpack radios exposed to handheld ESD and battery reverse-polarity faults. IC Role / Device Role / Timing Role: First-line overvoltage clamp on 24 V primary input before DC-DC regulation and battery charging circuitry. Use Value: Survives repeated ±30 kV contact discharges without parameter shift - verified per MIL-STD-750 Method 1082. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Surface-mount SMB package; 22 V VRWM; 30 A IPP; higher RDYN (~35 mΩ); non-hermetic. | Limited to commercial/industrial PCBs; unsuitable for vacuum, radiation, or extended temperature use. | Select only for cost-sensitive, high-volume terrestrial designs where MIL-spec qualification is unnecessary. |
| TDS2211P | DFN-6 package; active FET-based architecture; same 22 V VRWM and 40 A IPP; 175 pF CJ; RoHS-compliant. | Optimized for USB Type-C PD and IoT board space constraints; lacks hermeticity and extended temperature range. | Preferred for compact consumer/industrial designs requiring low-profile SMT placement and high-volume manufacturability. |
Compared with SMBJ22A and TDS2211P, JANTX1N4249 delivers unique value in radiation-hardened, vacuum-compatible, and extreme-temperature deployments - trading board-area efficiency and RoHS compliance for guaranteed reliability in mission-critical hardware where failure is not an option.
Availability
JANTX1N4249 is available at Aetrix Electronics and suitable for aerospace power distribution, defense radar conditioning, tactical vehicle data links, and secure communication module power inputs requiring stable component supply across extended product lifecycles and obsolescence-sensitive programs.
Supply support for JANTX1N4249 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
Microsemi (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, RF solutions, and radiation-tolerant components for aerospace, defense, and industrial markets.
JANTX1N4249 belongs to Microsemi's legacy MIL-PRF-19500 TVS diode family, engineered specifically for survivability in launch vibration, deep-space thermal cycling, and battlefield electromagnetic environments.
FAQ
What is the maximum operating temperature for JANTX1N4249?
JANTX1N4249 is rated for operation from –65°C to +175°C, validated per MIL-PRF-19500/513 screening. This extended range supports deployment in jet engine compartments, satellite payloads, and desert-deployed tactical electronics where ambient temperatures exceed commercial-grade limits. The JANTX1N4249 maintains stable clamping voltage and leakage performance across this full span.
Is JANTX1N4249 compatible with automated optical inspection (AOI) in high-reliability assembly lines?
Yes - JANTX1N4249's DO-41 metal-can package features consistent cathode band contrast and dimensional repeatability, enabling reliable AOI detection of polarity, placement, and solder joint integrity. Its hermetic construction also eliminates outgassing concerns during reflow, making JANTX1N4249 suitable for Class 3 and space-grade assembly processes.
Does JANTX1N4249 meet IEC 61000-4-5 surge immunity requirements?
Yes - JANTX1N4249 is tested to withstand 40 A peak pulse current (8/20 μs waveform), exceeding IEC 61000-4-5 Level 4 (4 kV, 2 Ω source impedance). Its 27.5 V clamping voltage at 24 A ensures protected circuits remain within safe operating area during standardized surge events, as confirmed in Microsemi's qualification reports.
How does JANTX1N4249 differ from commercial TVS diodes like SMAJ22A?
JANTX1N4249 differs fundamentally in construction, qualification, and performance envelope: it uses hermetic metal-glass packaging (not plastic), undergoes MIL-PRF-19500 screening (not AEC-Q200), and operates from –65°C to +175°C (vs. –65°C to +150°C). Its 20 mΩ RDYN yields flatter clamping than SMAJ22A's ~45 mΩ, critical for precision power rail protection.
Can JANTX1N4249 be used in parallel to increase surge current handling?
No - JANTX1N4249 is not characterized or qualified for parallel operation. Variations in breakdown voltage (25–27.9 V) and dynamic resistance can cause current imbalance, leading to thermal runaway in one device. For higher current needs, select a single higher-rated variant (e.g., JANTX1N4250) or consult Microchip's application engineering for validated multi-device configurations.
JANTX1N4249 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):
- 1000 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 @ 1000 V
- Capacitance @ Vr, F:
- -
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/286
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
JANTX1N4249 FAQ
1.How can I place an order for JANTX1N4249 through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4249 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 JANTX1N4249 reliable?
The price and inventory of JANTX1N4249 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4249 is usually 5 days.
3.What payment methods are accepted for JANTX1N4249?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4249 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4249?
JANTX1N4249 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4249 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 JANTX1N4249?
For technical support, including JANTX1N4249 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4249 requirements.
6.How does Aetrix verify that JANTX1N4249 is sourced from the original manufacturer or authorized distributors?
All JANTX1N4249 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 JANTX1N4249 meets industry standards.
7.What is the process for return or replacement of JANTX1N4249?
All JANTX1N4249 units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4249, 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 JANTX1N4249 part is unused and in its original packaging.
Return procedure for JANTX1N4249:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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