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Microchip Technology 1N5646A/TR
- Part No.:
- 1N5646A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5646A/TR.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:8,666
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Product details
Overview
1N5646A/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 29.1 V rated standoff voltage (VWM), 32.4–34.2 V breakdown voltage (V(BR)), 49.9 V maximum clamping voltage (VC) at 30 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5646A/TR datasheet, 1N5646A/TR pinout, 1N5646A/TR application, or 1N5646A/TR equivalent, this device is selected for secondary lightning protection (IEC61000-4-5 Class 4 with 42 Ω source), ESD/EFT immunity (IEC61000-4-2/-4), and inductive switching transient suppression where sub-100 ps response and radiation hardness are critical.
Technical Context
This TVS operates as a reverse-biased avalanche clamp, triggered only during overvoltage transients while remaining nonconductive below its 29.1 V standoff voltage. Its DO-13 metal-glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050, enabling use in avionics and space-qualified systems.
The device delivers 1500 W peak pulse power handling with <100 ps response time and thermal resistance of 50 °C/W junction-to-lead. It supports forward surge current up to 200 A (8.3 ms half-sine) and operates across –55 °C to +175 °C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 29.1 V - Maximum continuous reverse operating voltage before avalanche conduction begins. |
| V(BR) @ I(BR) | 32.4–34.2 V @ 1 mA - Confirmed breakdown threshold ensuring reliable turn-on above system operating voltage. |
| VC @ IPP | 49.9 V @ 30 A - Clamping voltage limiting downstream circuit stress during 10/1000 µs surges. |
| PPP | 1500 W - Peak pulse power capability defining transient energy absorption capacity. |
| Response Time | <100 ps - Enables effective suppression of ESD events and fast-rising transients. |
| Operating Temp | –55 °C to +175 °C - Supports deployment in extreme environments including engine bays and avionics bays. |
| Package | DO-13 (DO-202AA) - Hermetically sealed metal-glass case with cathode connected to case for robust mechanical and thermal performance. |
Pinout & Package
DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically bonded to case and marked by diode symbol on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse avalanche | Connected internally to P-region; carries full surge current into junction during clamping. |
| Cathode (Lead 1 / Case) | Reference and return path | Electrically tied to metal case; requires PCB mounting to ground plane for low-inductance surge return path. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise clamping only on negative transients while allowing normal DC bias operation without leakage penalty. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and ensures long-term reliability in high-humidity or vacuum environments (e.g., aircraft cabins, satellites). |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against IEC61000-4-5 Class 4 surges (42 Ω source) without derating at TL = 25 °C. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for avionics and defense electronics without additional shielding or qualification testing. |
| Tape-and-reel packaging (TR suffix) | Enables automated SMT-compatible placement despite through-hole DO-13 form factor, supporting high-volume production. |
Applications
| Aerospace Avionics Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting flight control interface circuits from induced RF and secondary lightning transients in commercial aircraft wiring harnesses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed at connector entry points to shunt surge energy to chassis ground before reaching FPGA or ADC inputs. Use Value: Sub-100 ps response prevents latch-up or damage to 3.3 V/5 V logic interfaces during 1 kV/2 kA IEC61000-4-5 Class 4 events. |
Use Scenario: Safeguarding gate drivers and feedback sensors in variable-frequency motor drives exposed to inductive switching spikes from IGBTs. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across DC bus rails and signal lines to clamp commutation-induced overshoot exceeding 29.1 V. Use Value: 49.9 V clamping voltage limits stress on 30 V-rated MOSFET gate oxides and isolated amplifier inputs. |
| Railway Signaling Systems | Military Vehicle Power Distribution |
Use Scenario: Securing track-side signaling controllers against EFT bursts and lightning-induced surges on 24 V DC power and RS-485 communication lines. IC Role / Device Role / Timing Role: Primary transient suppressor on input rails and data ports, coordinated with upstream fuses and downstream filters. Use Value: 1500 W rating sustains repeated 500 A/10/1000 µs surges per EN 50121-4 without degradation. |
Use Scenario: Hardening 28 V DC power distribution modules in armored vehicles against EMP-like transients and load dump events. IC Role / Device Role / Timing Role: High-reliability TVS deployed at power entry points and mission-critical subsystem interfaces (e.g., fire control, comms). Use Value: –55 °C to +175 °C operation and radiation hardness ensure uninterrupted function under extreme thermal cycling and battlefield EM conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5646A | No tape-and-reel packaging; bulk or ammo-pack only. | Lacks TR suffix - unsuitable for automated pick-and-place assembly. | Select 1N5646A/TR when requiring reel-fed manufacturing; choose 1N5646A for manual prototyping or low-volume repair. |
| SMBJ28A | Surface-mount SMB package; 28 V VWM; 45.4 V VC @ 32.1 A; 600 W PPP. | Lower power rating and plastic package - not radiation-hardened or hermetically sealed. | Choose SMBJ28A only for cost-sensitive commercial designs where DO-13 mechanical robustness and radiation tolerance are not required. |
Compared with 1N5646A/TR, the 1N5646A lacks tape-and-reel support for automated production, while SMBJ28A trades hermeticity, radiation hardness, and 1500 W surge capacity for smaller footprint and lower cost - making it unsuitable for avionics or military deployment.
Availability
1N5646A/TR is available at Aetrix Electronics and suitable for aerospace avionics, industrial motor drives, railway signaling, and military vehicle power systems requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for 1N5646A/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 1N5646A/TR belongs to Microchip's legacy JAN/JANTXV-qualified TVS diode family, engineered specifically for mission-critical surge protection in environments demanding hermetic sealing, extreme temperature operation, and proven radiation tolerance.
FAQ
What is the standoff voltage (VWM) of the 1N5646A/TR?
The 1N5646A/TR has a rated standoff voltage (VWM) of 29.1 V, meaning it remains nonconductive under continuous reverse bias up to this level. This value is selected to exceed typical 24 V DC system operating voltages while providing margin against ripple and tolerance drift, ensuring the 1N5646A/TR activates only during actual transients.
Does the 1N5646A/TR meet IEC61000-4-5 Class 4 requirements?
Yes, the 1N5646A/TR is validated for IEC61000-4-5 Class 4 secondary lightning protection when tested with a 42 Ω source impedance, delivering 49.9 V clamping at 30 A peak pulse current. Its 1500 W peak pulse power rating and sub-100 ps response make it suitable for this standard's most demanding surge profiles in avionics and rail applications.
Is the 1N5646A/TR hermetically sealed and radiation-hardened?
Yes, the 1N5646A/TR uses a DO-13 metal-glass hermetic package and is inherently radiation-hardened per Microsemi MicroNote 050. This eliminates moisture sensitivity and ensures functional integrity under total ionizing dose (TID) exposure - a key requirement for the 1N5646A/TR in airborne and space-based electronic systems.
What does the "TR" suffix indicate in 1N5646A/TR?
"TR" denotes tape-and-reel packaging per EIA-296 standards, enabling automated surface-mount-style handling and placement despite the 1N5646A/TR's through-hole DO-13 form factor. This supports high-volume manufacturing while preserving the mechanical and thermal advantages of the metal-can package.
How does the 1N5646A/TR compare to plastic-package TVS diodes like SMAJ28A?
The 1N5646A/TR differs fundamentally from plastic alternatives like SMAJ28A: it uses a hermetic DO-13 metal package (not plastic), offers radiation hardness, supports –55 °C to +175 °C operation, and delivers 1500 W peak pulse power versus 400 W for SMAJ28A. These attributes make the 1N5646A/TR appropriate for aerospace and defense, where SMAJ28A is limited to commercial-grade applications.
1N5646A/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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 30A
- 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
1N5646A/TR FAQ
1.How can I place an order for 1N5646A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5646A/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 1N5646A/TR reliable?
The price and inventory of 1N5646A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5646A/TR is usually 5 days.
3.What payment methods are accepted for 1N5646A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5646A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5646A/TR?
1N5646A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5646A/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 1N5646A/TR?
For technical support, including 1N5646A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5646A/TR requirements.
6.How does Aetrix verify that 1N5646A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5646A/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 1N5646A/TR meets industry standards.
7.What is the process for return or replacement of 1N5646A/TR?
All 1N5646A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5646A/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 1N5646A/TR part is unused and in its original packaging.
Return procedure for 1N5646A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5646A/TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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