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Microchip Technology 1N5642A/TR
- Part No.:
- 1N5642A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5642A/TR.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
1N5642A/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 20.5 V rated standoff voltage (VWM), 22.8 V minimum breakdown voltage (V(BR)), 33.2 V maximum clamping voltage (VC) at 45 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5642A/TR datasheet, 1N5642A/TR pinout, 1N5642A/TR application, or 1N5642A/TR equivalent, this device is selected for secondary lightning protection (IEC61000-4-5, 2 Ω source impedance), ESD/EFT hardening (IEC61000-4-2/-4), and inductive switching transient suppression where sub-100 ps response and radiation-hardened operation are required.
Technical Context
The 1N5642A/TR operates as a unidirectional avalanche diode, entering controlled breakdown above its 22.8 V V(BR) to clamp transients while maintaining <5 µA standby leakage at 20.5 V VWM. Its hermetic DO-13 package ensures stable thermal resistance (50 °C/W junction-to-lead) and operation across –55 °C to +175 °C.
It delivers 1500 W peak pulse power handling with <100 ps response time, enabling protection against fast-rising ESD events and slower 8.3 ms inductive surges (200 A forward surge). The device exhibits a +0.094 %/°C temperature coefficient of V(BR), ensuring predictable voltage drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.5 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level DC bias margin. |
| V(BR) min | 22.8 V @ 1 mA - Minimum avalanche onset voltage; defines lower bound of clamping threshold under specified test current. |
| VC @ IPP | 33.2 V @ 45 A - Maximum voltage seen across device during 10/1000 µs surge; determines protected circuit's peak stress level. |
| PPP | 1500 W - Peak pulse power dissipation capability; enables robust handling of IEC61000-4-5 Class 2 (2 Ω) lightning surges. |
| Response time | <100 ps - Time from transient onset to clamping activation; critical for ESD (IEC61000-4-2) and EFT (IEC61000-4-4) immunity. |
| Operating temp | –55 °C to +175 °C - Full military-grade temperature range; supports deployment in engine bays, avionics bays, and downhole equipment. |
| Package | DO-13 (DO-202AA) - Hermetically sealed metal-glass case with cathode-connected case; provides radiation hardness and long-term reliability. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with cathode connected to case and polarity indicated by diode symbol marking. Weight: 1.4 g. Lead finish: Tin-Lead per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse surge | Connected to protected line; carries full 45 A IPP surge current into avalanche region. |
| Cathode (Lead 1 / Case) | Reference terminal and heat path | Electrically tied to metal case; serves as low-inductance return path and primary thermal conduction route to PCB or chassis. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise clamping on positive-going transients only; avoids interference with DC bias or signal integrity on bidirectional lines. |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC61000-4-5 Class 2 secondary lightning protection with 2 Ω source impedance without derating. |
| Hermetic DO-13 metal package | Provides inherent radiation hardness (per MicroNote 050), moisture immunity, and stable parametric performance over 20+ year field life. |
| Sub-100 ps response time | Clamps ESD events (IEC61000-4-2 ±8 kV contact) before sensitive ICs experience latch-up or gate oxide damage. |
| Military qualification ready (JANTXV prefix option) | Enables direct upgrade path to JANTXV1N5642A for MIL-PRF-19500/500-compliant programs without redesign. |
Applications
| Aerospace Avionics Power Bus Protection | Industrial Motor Drive Control Signal Lines |
|---|---|
Use Scenario: Protecting 24 V DC power distribution buses in airborne flight control computers from induced RF and secondary lightning surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient energy directly at bus entry point; cathode grounded to airframe. Use Value: Meets IEC61000-4-5 Class 2 (2 Ω) requirements with 33.2 V clamping, limiting downstream voltage stress to <35 V during 45 A surges. |
Use Scenario: Shielding isolated encoder feedback lines in servo drives from commutation-induced transients and ground bounce. IC Role / Device Role / Timing Role: Point-of-use transient suppressor on differential A/B/Z channels; placed adjacent to connector interface. Use Value: Sub-100 ps response prevents false edge detection in quadrature signals during 200 A inductive turn-off events. |
| Railway Signaling Interface Protection | Downhole Oilfield Sensor Power Conditioning |
Use Scenario: Safeguarding 48 V DC trackside signaling inputs against EFT bursts (IEC61000-4-4) and coupling from adjacent traction lines. IC Role / Device Role / Timing Role: Standoff-clamp TVS on input filter stage; coordinated with common-mode chokes and gas discharge tubes. Use Value: 20.5 V VWM matches nominal 48 V rail derated for ripple; 1500 W rating sustains repeated 5 kHz burst sequences. |
Use Scenario: Protecting 12 V sensor supply rails in high-temperature (>150 °C) downhole logging tools exposed to switching noise and cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on regulated output; mounted directly to thermally conductive housing wall. Use Value: –55 °C to +175 °C operating range and hermetic seal ensure reliability where plastic-packaged alternatives fail prematurely. |
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 @ 41.7 A; same 1500 W rating but higher clamping voltage. | Requires PCB re-layout; lacks hermetic seal and radiation hardness; unsuitable for avionics or high-temp downhole use. | Select when automated assembly, space constraints, or cost drive SMT adoption-accept higher VC and reduced environmental ruggedness. |
| 1N5642A (bulk) | Identical electrical specs and DO-13 package; differs only in packaging format (tape-and-reel vs. bulk). | No functional difference; TR suffix denotes EIA-296 tape-and-reel packaging for pick-and-place compatibility. | Choose 1N5642A/TR for automated manufacturing; select bulk 1N5642A for hand-soldered prototypes or low-volume repair. |
Compared with SMCJ22A, the 1N5642A/TR offers superior thermal stability, radiation tolerance, and lower clamping voltage in a through-hole format ideal for high-reliability systems; compared with bulk 1N5642A, the TR variant enables seamless SMT integration without electrical trade-offs.
Availability
1N5642A/TR is available at Aetrix Electronics and suitable for aerospace avionics, industrial motor drives, railway signaling interfaces, and downhole oilfield sensor systems requiring stable component supply, long-term obsolescence management, and traceable military-grade sourcing.
Supply support for 1N5642A/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 legacy Microsemi assets) is a global semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5642A/TR belongs to Microchip's legacy TVS diode family engineered for mission-critical transient suppression in extreme environments-designed to meet MIL-PRF-19500/500 and IEC61000-4-x standards without derating.
FAQ
What is the clamping voltage of the 1N5642A/TR under a standard 10/1000 µs surge?
The 1N5642A/TR has a maximum clamping voltage (VC) of 33.2 V when subjected to its rated 45 A peak pulse current (IPP) under the 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the highest voltage that will appear across protected circuitry during such a transient event. The 1N5642A/TR achieves this clamping performance while maintaining a 20.5 V standoff voltage, making it suitable for 24 V systems with margin.
Is the 1N5642A/TR suitable for ESD protection per IEC61000-4-2?
Yes, the 1N5642A/TR is explicitly validated for ESD protection per IEC61000-4-2 due to its sub-100 ps response time and low clamping voltage. Its fast avalanche onset limits voltage overshoot during ±8 kV contact discharge events, protecting downstream logic and interface ICs. The 1N5642A/TR's hermetic DO-13 package further enhances reliability in ESD-prone environments where moisture ingress could degrade plastic-packaged alternatives.
What does the "TR" suffix mean in 1N5642A/TR?
"TR" stands for Tape-and-Reel packaging per EIA-296 standard, indicating that the 1N5642A/TR is supplied in industry-standard carrier tape compatible with automated SMT placement equipment. Electrically and mechanically, the 1N5642A/TR is identical to the bulk version 1N5642A; the TR suffix reflects only the packaging format-not a different part number, specification, or revision. This allows drop-in use in high-volume manufacturing without design changes.
Can the 1N5642A/TR be used in place of the 1N5642A without layout changes?
Yes-the 1N5642A/TR shares identical DO-13 mechanical dimensions, pinout, thermal profile, and electrical specifications with the bulk 1N5642A. No PCB layout modifications are needed when substituting 1N5642A/TR for 1N5642A; only the packaging method differs. Both versions use the same cathode-connected case configuration and mounting footprint, preserving thermal and electrical performance in existing designs.
Does the 1N5642A/TR meet military qualification standards?
The base 1N5642A/TR is commercially qualified, but the "A" suffix indicates tighter parameter tolerances aligned with MIL-PRF-19500/500 requirements. When ordered with JAN, JANTX, or JANTXV prefixes (e.g., JANTXV1N5642A), the device undergoes full military screening including extended temperature cycling, hermeticity testing, and lot traceability. The 1N5642A/TR itself serves as the commercial baseline for those qualified variants.
1N5642A/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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 45A
- 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
1N5642A/TR FAQ
1.How can I place an order for 1N5642A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5642A/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 1N5642A/TR reliable?
The price and inventory of 1N5642A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5642A/TR is usually 5 days.
3.What payment methods are accepted for 1N5642A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5642A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5642A/TR?
1N5642A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5642A/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 1N5642A/TR?
For technical support, including 1N5642A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5642A/TR requirements.
6.How does Aetrix verify that 1N5642A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5642A/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 1N5642A/TR meets industry standards.
7.What is the process for return or replacement of 1N5642A/TR?
All 1N5642A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5642A/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 1N5642A/TR part is unused and in its original packaging.
Return procedure for 1N5642A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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