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Microchip Technology 1N5644A/TR
- Part No.:
- 1N5644A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5644A/TR.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:7,453
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Product details
Overview
1N5644A/TR from Microchip Technology is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, designed for high-reliability surge protection in aerospace and industrial systems. It features a 25.6 V rated standoff voltage (VWM), 31.5 V maximum clamping voltage (VC) at 36 A peak pulse current, and 1500 W peak pulse power rating at 10/1000 µs waveform - enabling robust secondary lightning and ESD protection per IEC61000-4-2/4-4/4-5.
For engineers reviewing the 1N5644A/TR datasheet, 1N5644A/TR pinout, 1N5644A/TR application, or 1N5644A/TR equivalent, this device serves as a military-grade, through-hole TVS solution where fast response (<100 ps), radiation hardness, and stable operation from –55°C to +175°C are critical for avionics power rail and signal line protection.
Technical Context
The 1N5644A/TR operates as a unidirectional avalanche diode, entering breakdown at minimum 27.0 V (VBR) with 1 mA test current and clamping transients to ≤31.5 V at 36 A. Its hermetic DO-13 package ensures long-term reliability under thermal cycling and humidity exposure, supporting sustained operation at lead temperature up to +125°C with 1 W DC power dissipation derating.
It complies with MIL-PRF-19500/500 for JANTXV qualification when ordered with prefix (e.g., JANTXV1N5644A), and exhibits a temperature coefficient of VBR of 0.097 %/°C - enabling predictable voltage drift across wide ambient ranges without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Rated Standoff Voltage) | 25.6 V - sets maximum continuous reverse operating voltage before leakage exceeds 5 µA; selected to match 24 V nominal supply rails. |
| VBR (Breakdown Voltage @ 1 mA) | 27.0–28.5 V - defines precise avalanche onset; tight tolerance supports consistent protection threshold in safety-critical systems. |
| VC (Clamping Voltage @ IPP) | 41.4 V @ 36 A - limits transient-induced overvoltage on protected circuitry during 10/1000 µs surges. |
| PPP (Peak Pulse Power) | 1500 W - sustains high-energy transients without failure; validated per JEDEC test conditions with <0.01% duty cycle. |
| Response Time | <100 ps - enables effective suppression of ESD events (IEC61000-4-2) and fast-rising switching spikes before IC damage occurs. |
| Operating Temperature Range | –55°C to +175°C - supports deployment in engine bays, avionics bays, and downhole electronics without derating. |
| Package | DO-13 (DO-202AA) - hermetically sealed metal-glass case with cathode-connected case; enables high thermal conductivity and radiation hardness. |
Pinout & Package
DO-13 (DO-202AA) package: axial-leaded, hermetically sealed metal case with glass-to-metal seal; cathode terminal electrically connected to case; polarity marked by diode symbol on body; weight ≈1.4 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse surge | Connected to protected line; must be routed with low-inductance path to minimize clamping overshoot. |
| Cathode (Lead 1 / Case) | Transient current return path | Electrically tied to metal case; requires direct low-impedance connection to system ground plane for optimal surge shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables integration on DC-biased lines (e.g., 24 V power rails) without forward conduction during normal operation. |
| Hermetic DO-13 metal package | Provides immunity to moisture ingress and outgassing in vacuum or high-humidity environments; qualified for space-grade applications. |
| 1500 W peak pulse power (10/1000 µs) | Handles Class 4 secondary lightning surges per IEC61000-4-5 with 42 Ω source impedance without degradation. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050; suitable for avionics and satellite subsystems exposed to total ionizing dose (TID). |
| JANTXV qualification capability | Supports full MIL-PRF-19500/500 compliance when ordered as JANTXV1N5644A; includes screening for burn-in, thermal shock, and life testing. |
Applications
| Aerospace Power Distribution | Industrial Motor Drive Controls |
|---|---|
Use Scenario: Protection of 24 V DC bus in airborne flight control actuators against induced lightning transients and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across power input terminals to clamp surges before reaching DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤41.4 V during 36 A surges, preserving integrity of downstream 3.3 V/5 V logic and analog sensors per DO-160 Section 22. |
Use Scenario: Input protection for PLC digital I/O modules subjected to inductive switching noise from solenoid valves and contactors. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V supply rail and discrete input lines, mounted directly at connector entry points. Use Value: Responds in <100 ps to suppress EFT bursts (IEC61000-4-4) and prevents latch-up or reset events in field-programmable gate arrays and isolation drivers. |
| Railway Signaling Interfaces | Downhole Oil & Gas Sensors |
Use Scenario: Signal line protection for track-side axle counter interfaces exposed to traction current coupling and lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in back-to-back configuration on RS-485 differential pairs. Use Value: Maintains 25.6 V standoff while clamping 10/1000 µs surges to 41.4 V, ensuring data integrity across 1200 m cable runs under EN 50121-3-2 compliance. |
Use Scenario: Protection of pressure/temperature sensor front-ends in high-temperature wellhead electronics operating at 175°C ambient. IC Role / Device Role / Timing Role: Standoff-rated TVS on excitation lines and analog output paths to prevent transient-induced calibration drift or sensor failure. Use Value: Stable VBR drift (0.097 %/°C) and –55°C to +175°C operation ensure repeatable clamping performance across full downhole thermal profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ24A | Surface-mount SMC package; 24 V VWM; 38.9 V VC @ 38.6 A; same 1500 W rating but lower thermal resistance (junction-to-ambient). | Requires PCB rework for SMT layout; unsuitable for through-hole legacy designs or high-vibration mechanical mounting. | Select when board space is constrained and automated assembly is available; verify pad thermal relief for 175°C operation. |
| 1N5644 | Commercial-grade version; identical electrical specs but no MIL-PRF-19500/500 qualification or radiation hardness validation. | Limited to non-mission-critical industrial use; not approved for aerospace or defense programs requiring JANTXV traceability. | Choose for cost-sensitive prototyping or commercial-grade systems where military screening and radiation data are unnecessary. |
Compared with SMCJ24A and 1N5644, the 1N5644A/TR uniquely combines hermetic DO-13 packaging, JANTXV qualification readiness, and radiation hardness - making it irreplaceable in avionics, missile guidance, and nuclear instrumentation where reliability under extreme environmental stress is non-negotiable.
Availability
1N5644A/TR is available at Aetrix Electronics and suitable for aerospace power distribution, industrial motor drive controls, railway signaling interfaces, and downhole oil & gas sensors requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5644A/TR 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
Microchip Technology (formerly Microsemi) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5644A/TR belongs to Microchip's legacy TVS diode family engineered for mission-critical surge protection - emphasizing hermetic packaging, military qualification pathways, and performance stability under thermal, mechanical, and radiation stress.
FAQ
What is the clamping voltage of the 1N5644A/TR under a 10/1000 µs surge?
The 1N5644A/TR has a maximum clamping voltage (VC) of 41.4 V when subjected to its rated peak pulse current of 36 A under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and guarantees that protected circuitry will not experience transient voltages exceeding this level during specified surge events - critical for safeguarding 24 V system components.
Is the 1N5644A/TR suitable for aerospace applications requiring radiation hardness?
Yes, the 1N5644A/TR is inherently radiation hard per Microsemi MicroNote 050, and its hermetic DO-13 package provides immunity to total ionizing dose (TID) effects. When ordered with the JANTXV prefix (e.g., JANTXV1N5644A), it undergoes full MIL-PRF-19500/500 screening - making the 1N5644A/TR a qualified choice for flight-critical avionics and satellite subsystems.
How does the "TR" suffix affect packaging and handling of the 1N5644A/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-296 standards, enabling automated pick-and-place assembly. The 1N5644A/TR is supplied in reels with standardized orientation (cathode toward sprocket holes), moisture sensitivity level (MSL) = 1, and solder profile compatibility up to 260°C for 10 seconds - preserving the hermetic seal integrity while supporting high-volume manufacturing.
What is the standoff voltage rating for the 1N5644A/TR, and why is it important?
The 1N5644A/TR has a rated standoff voltage (VWM) of 25.6 V, meaning it remains non-conductive below this reverse voltage with leakage current ≤5 µA. This rating ensures compatibility with standard 24 V DC systems while providing sufficient margin above nominal voltage to avoid false triggering - a key design requirement for reliable long-term operation in power rail protection.
Can the 1N5644A/TR replace the 1N5644 in an existing design?
Yes, the 1N5644A/TR is a direct functional replacement for the 1N5644, sharing identical electrical specifications including VWM, VBR, VC, and PPP. However, the "A" suffix denotes tighter parameter tolerances, and "TR" confirms tape-and-reel packaging - so the 1N5644A/TR maintains full compatibility while offering improved consistency and automated assembly readiness.
1N5644A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 36A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-13
1N5644A/TR FAQ
1.How can I place an order for 1N5644A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5644A/TR 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 1N5644A/TR reliable?
The price and inventory of 1N5644A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5644A/TR is usually 5 days.
3.What payment methods are accepted for 1N5644A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5644A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5644A/TR?
1N5644A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5644A/TR 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 1N5644A/TR?
For technical support, including 1N5644A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5644A/TR requirements.
6.How does Aetrix verify that 1N5644A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5644A/TR 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 1N5644A/TR meets industry standards.
7.What is the process for return or replacement of 1N5644A/TR?
All 1N5644A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5644A/TR, 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 1N5644A/TR part is unused and in its original packaging.
Return procedure for 1N5644A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5644A/TR Tags
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