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Microchip Technology 1N5643A/TR
- Part No.:
- 1N5643A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5643A/TR.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
1N5643A/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, avionics, and industrial systems. It features a 21.8 V rated standoff voltage (VWM), 25.7 V minimum breakdown voltage (V(BR)), 37.5 V maximum clamping voltage (VC) at 40 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5643A/TR datasheet, 1N5643A/TR pinout, 1N5643A/TR application, or 1N5643A/TR equivalent, this device serves as a military-grade, through-hole TVS solution for secondary lightning protection (IEC61000-4-5, 12 Ω source), ESD/EFT immunity (IEC61000-4-2/-4), and inductive switching transient suppression in harsh-environment electronics.
Technical Context
The 1N5643A/TR operates as a unidirectional avalanche diode, entering controlled breakdown when transient voltage exceeds its V(BR) threshold to clamp downstream circuitry. Its response time is under 100 ps, enabling effective suppression of fast-rising ESD and EFT events.
It is rated for operation from –55 °C to +175 °C, with thermal resistance of 50 °C/W junction-to-lead and 110 °C/W junction-to-ambient on FR4 PCB. The cathode is internally connected to the metal case, requiring proper grounding of the case in layout for optimal clamping performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 21.8 V - Maximum continuous reverse operating voltage before conduction begins; must exceed system DC bus or signal rail voltage. |
| V(BR) min | 25.7 V @ 1 mA - Minimum avalanche breakdown voltage; ensures reliable triggering above normal operating transients. |
| VC @ IPP | 37.5 V @ 40 A - Maximum clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected ICs. |
| PPP | 1500 W - Peak pulse power handling capability; supports robust protection against IEC61000-4-5 Class 3 surges (12 Ω source). |
| ID @ VWM | 5 µA - Standby leakage current at rated standoff voltage; negligible impact on low-power circuits. |
| Package | DO-13 (DO-202AA) - Hermetic metal-glass through-hole package; enables high reliability, radiation hardness, and thermal stability. |
| Operating Temp | –55 °C to +175 °C - Full military temperature range; suitable for engine bay, avionics bays, and downhole electronics. |
Pinout & Package
DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads. Cathode (K) is electrically connected to the metal case and marked with a diode symbol on the body. Lead length ≥1.000″ (25.4 mm); case diameter 0.215–0.235″ (5.46–5.97 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse surge | Connected to protected line (e.g., power rail or signal); current flows anode→cathode during clamping. |
| Cathode (Lead 1 / Case) | Clamping reference and return path | Internally tied to metal case; must be soldered to low-impedance ground plane to minimize clamping voltage rise. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC61000-4-5 Class 3 surges (12 Ω source) without parallel staging. |
| <100 ps response time | Clamps ESD (IEC61000-4-2) and EFT (IEC61000-4-4) transients before sensitive logic or analog circuitry is damaged. |
| Hermetic DO-13 metal package | Provides long-term reliability in high-humidity, high-vibration, and radiation-prone environments (e.g., avionics, space-qualified subsystems). |
| MIL-PRF-19500/500 qualified (JANTXV option) | Meets stringent screening, testing, and traceability requirements for defense and aerospace programs (requires JANTXV prefix). |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050; suitable for use in radiation-exposed applications without additional shielding or derating. |
Applications
| Aerospace Power Bus Protection | Avionics Signal Line Protection |
|---|---|
Use Scenario: Protecting 28 V DC aircraft power distribution networks from load dump, inductive kickback, and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power rail and chassis ground. Use Value: Limits transient overvoltage to ≤37.5 V during 40 A surges, preserving integrity of MIL-STD-704-compliant power converters and controllers. |
Use Scenario: Shielding ARINC 429 data lines and sensor inputs in flight control computers from ESD and RF-induced transients. IC Role / Device Role / Timing Role: Fast-response clamping diode shunting transient energy to ground before signal integrity degrades. Use Value: Sub-100 ps response prevents bit errors or latch-up in high-speed digital receivers exposed to IEC61000-4-2 ±15 kV contact discharge. |
| Industrial Motor Drive Control | Military Vehicle Electronics |
Use Scenario: Safeguarding gate drivers and feedback sensors in 24–48 V motor inverters subjected to back-EMF spikes and relay bounce. IC Role / Device Role / Timing Role: Primary surge suppression component across DC link and control signal paths. Use Value: Withstands 200 A forward surge (8.3 ms half-sine), enabling robust protection against repetitive inductive switching events. |
Use Scenario: Hardening communication interfaces (MIL-STD-1553, RS-485) in tracked vehicle command systems exposed to EMP and lightning coupling. IC Role / Device Role / Timing Role: Military-qualified transient suppressor integrated into board-level surge protection modules. Use Value: JANTXV-qualified variants (e.g., JANTXV1N5643A) provide full traceability, lot control, and extended temperature operation (–55 °C to +175 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ22A | Surface-mount SMC package; 22 V VWM; 36.2 V VC @ 41.5 A; same 1500 W rating but lower thermal mass. | Used where board space is constrained and reflow assembly is preferred; lacks hermetic seal and radiation hardness. | Select SMCJ22A for cost-sensitive commercial designs with standard PCB assembly; avoid in avionics or high-radiation zones. |
| 1N5643A (bulk, non-TR) | Identical electrical specs and DO-13 package; differs only in packaging-tape-and-reel (TR) vs. bulk tube delivery. | No functional difference; TR version enables automated pick-and-place insertion in high-volume production. | Choose 1N5643A/TR when using SMT placement equipment; select bulk 1N5643A for manual or low-volume prototyping. |
Compared with SMCJ22A, the 1N5643A/TR offers superior thermal stability, hermetic reliability, and radiation tolerance-critical for aerospace and defense-but requires through-hole assembly. Versus bulk 1N5643A, the TR variant provides identical performance with optimized manufacturability for automated lines.
Availability
1N5643A/TR is available at Aetrix Electronics and suitable for aerospace power systems, avionics signal conditioning, industrial motor drives, and military vehicle electronics requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5643A/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 (including former Microsemi) is a global semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5643A/TR belongs to Microchip's legacy TVS diode family engineered for mission-critical transient suppression-designed specifically for environments demanding hermetic sealing, extreme temperature operation, and compliance with MIL-PRF-19500/500.
FAQ
What is the clamping voltage of the 1N5643A/TR under a 10/1000 µs surge?
The 1N5643A/TR has a maximum clamping voltage (VC) of 37.5 V when subjected to a 40 A peak pulse current with a 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is the 1N5643A/TR suitable for IEC61000-4-5 Class 3 lightning surge testing?
Yes-the 1N5643A/TR is explicitly rated for IEC61000-4-5 Class 3 secondary lightning protection with a 12 Ω source impedance, as confirmed in the datasheet's Applications/Benefits section. Its 1500 W peak pulse power and 37.5 V clamping enable compliance when properly mounted with low-inductance grounding.
Does the "TR" suffix in 1N5643A/TR indicate a different electrical specification?
No-the "TR" suffix denotes tape-and-reel packaging only; all electrical, thermal, and mechanical specifications of the 1N5643A/TR are identical to those of the bulk-packaged 1N5643A. The TR format supports automated assembly but does not alter performance or reliability.
How is the cathode terminal configured on the 1N5643A/TR DO-13 package?
The cathode (K) of the 1N5643A/TR is electrically connected to the metal case and designated as Lead 1 per the datasheet. Polarity is marked on the body with a diode symbol, and the case must be soldered to a low-impedance ground plane to ensure effective clamping and minimal voltage overshoot.
What is the maximum operating temperature range for the 1N5643A/TR?
The 1N5643A/TR is rated for continuous operation from –55 °C to +175 °C, making it suitable for under-hood automotive, downhole oil/gas, and airborne avionics applications. This range is validated per JEDEC and MIL-PRF-19500/500 requirements for high-reliability discrete devices.
1N5643A/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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1N5643A/TR FAQ
1.How can I place an order for 1N5643A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5643A/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 1N5643A/TR reliable?
The price and inventory of 1N5643A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5643A/TR is usually 5 days.
3.What payment methods are accepted for 1N5643A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5643A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5643A/TR?
1N5643A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5643A/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 1N5643A/TR?
For technical support, including 1N5643A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5643A/TR requirements.
6.How does Aetrix verify that 1N5643A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5643A/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 1N5643A/TR meets industry standards.
7.What is the process for return or replacement of 1N5643A/TR?
All 1N5643A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5643A/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 1N5643A/TR part is unused and in its original packaging.
Return procedure for 1N5643A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5643A/TR Tags
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