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Microchip Technology 1N5638A/TR
- Part No.:
- 1N5638A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5638A/TR.pdf
- Description:
- TVS DIODE 13.6VWM 22.5VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:6,432
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Product details
Overview
1N5638A/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 13.6 V rated standoff voltage (VWM), 15.2 V minimum breakdown voltage (V(BR)), 22.5 V maximum clamping voltage (VC) at 67 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5638A/TR datasheet, 1N5638A/TR pinout, 1N5638A/TR application, or 1N5638A/TR equivalent, this device serves as a military-grade, through-hole TVS solution for secondary lightning protection (IEC61000-4-5 Class 4 with 2 Ω source impedance), ESD/EFT suppression (IEC61000-4-2/-4), and inductive switching transient clamping in avionics power rails and ruggedized control interfaces.
Technical Context
The 1N5638A/TR operates as a unidirectional avalanche diode, entering breakdown when reverse voltage exceeds its 15.2–16.8 V V(BR) range at 1 mA test current. Its clamping action limits transients to ≤22.5 V at 67 A, enabling robust protection of downstream 12 V logic and power circuitry without latch-up or thermal runaway.
Constructed in a DO-13 (DO-202AA) hermetic metal-glass package with cathode-to-case polarity, it delivers 50 °C/W junction-to-lead thermal resistance and operates across –55 °C to +175 °C. Its <100 ps response time ensures effective suppression of ESD events and fast-rising inductive spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 13.6 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA; matches 12 V nominal rail with safety margin. |
| V(BR) @ I(BR) | 15.2–16.8 V @ 1 mA - Avalanche breakdown threshold; ensures reliable triggering above system operating voltage. |
| VC @ IPP | 22.5 V @ 67 A - Clamped voltage during 10/1000 µs surge; protects 24 V tolerant inputs while limiting stress on protected ICs. |
| PPP | 1500 W - Peak pulse power handling capability; sustains single high-energy transients common in avionics and motor drives. |
| Response Time | <100 ps - Near-instantaneous turn-on enables effective ESD (IEC61000-4-2) and EFT (IEC61000-4-4) suppression. |
| Operating Temp | –55 °C to +175 °C - Supports deployment in engine bays, flight control units, and downhole electronics without derating. |
| Package | DO-13 (DO-202AA) - Hermetically sealed metal-glass case with cathode connected to case; meets MIL-PRF-19500/500 JANTXV requirements. |
Pinout & Package
DO-13 (DO-202AA) hermetic metal-glass package with axial leads; cathode terminal electrically bonded to case and marked by diode symbol on body. Lead length ≥1.000″, case diameter 0.215–0.235″, weight ≈1.4 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient return path | Connected to ground or low-impedance reference; carries full surge current during clamping. |
| Cathode (Lead 1 / Case) | Protected line connection | Electrically tied to case and marked with diode symbol; connects to line being protected (e.g., 12 V supply rail). |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise overvoltage clamping on positive-going transients while blocking reverse conduction in DC-biased rails. |
| JANTXV qualification option | Supports MIL-PRF-19500/500 compliance when ordered as JANTXV1N5638A; required for defense and space-grade designs. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and outgassing risks; maintains parameter stability under thermal cycling and high-humidity environments. |
| 1500 W peak pulse power | Handles worst-case IEC61000-4-5 Class 4 surges (4 kV, 2 Ω source) without degradation or parametric shift. |
| Low temperature coefficient | 0.086 %/°C V(BR) drift ensures stable clamping threshold across –55 °C to +175 °C operating range. |
Applications
| Avionics Power Bus Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 12 V DC power distribution in flight control actuators against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between bus and ground, triggered within 100 ps to limit transients to ≤22.5 V. Use Value: Prevents latch-up or damage to microcontrollers and analog front-ends during 1500 W surge events per IEC61000-4-5. |
Use Scenario: Safeguarding PLC digital I/O modules from relay coil flyback and contact arcing in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V input lines, absorbing repetitive 8.3 ms half-sine surges up to 200 A forward surge current. Use Value: Extends module lifetime by eliminating cumulative oxide degradation in protected interface ICs under daily switching stress. |
| Secondary Lightning Protection | Ruggedized Communication Interface |
|
Use Scenario: Meeting IEC61000-4-5 Class 4 (4 kV, 2 Ω source) requirements for outdoor telecom power supplies. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters, clamping to 22.5 V before energy reaches filtering stages. Use Value: Enables compliance with EN 61000-4-5 without additional series impedance or staged protection networks. |
Use Scenario: Shielding RS-485 transceivers in oilfield SCADA systems from ESD and induced RF coupling. IC Role / Device Role / Timing Role: Fast-response TVS on differential bus lines, suppressing ±15 kV contact ESD (IEC61000-4-2) without signal distortion. Use Value: Maintains data integrity during field maintenance while surviving repeated ESD events without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5638/TR | Commercial-grade version; same VWM (13.6 V), VC (22.5 V), and DO-13 package but lacks JANTXV qualification and tighter V(BR) tolerance (15.2–17.6 V vs. 15.2–16.8 V). | Suitable for non-military industrial use where MIL-spec screening is not mandated. | Select 1N5638/TR for cost-sensitive commercial deployments with identical electrical performance but relaxed reliability testing. |
| SMCJ13A | Surface-mount SMC package; same 13 V VWM and 22.5 V VC, but lower 1000 W PPP rating and 110 °C/W junction-to-ambient thermal resistance. | Better suited for high-density PCBs but requires thermal relief pads and cannot match DO-13's hermeticity or high-temp operation. | Choose SMCJ13A only when board space constraints prohibit through-hole mounting and full 1500 W rating is not required. |
Compared with 1N5638A/TR, the 1N5638/TR offers identical surge parameters without military screening, while SMCJ13A trades hermetic reliability and peak power for compactness-making the 1N5638A/TR optimal for mission-critical, high-temperature, or high-surge environments.
Availability
1N5638A/TR is available at Aetrix Electronics and suitable for avionics power bus protection, industrial motor drive control, secondary lightning protection, and ruggedized communication interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5638A/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 1N5638A/TR belongs to Microchip's legacy JAN/JANTXV-qualified TVS diode family, engineered specifically for survivability in extreme electromagnetic environments including airborne avionics, missile guidance systems, and nuclear instrumentation.
FAQ
What is the clamping voltage of the 1N5638A/TR under a 10/1000 µs surge?
The 1N5638A/TR exhibits a maximum clamping voltage (VC) of 22.5 V when subjected to its rated 67 A peak pulse current under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream circuit protection design, ensuring sensitive 24 V-tolerant ICs remain within safe voltage limits during transient events.
Is the 1N5638A/TR suitable for IEC61000-4-5 Class 4 secondary lightning protection?
Yes, the 1N5638A/TR is explicitly rated for IEC61000-4-5 Class 4 secondary lightning protection when tested with a 2 Ω source impedance, as confirmed in the manufacturer's technical data sheet. Its 1500 W peak pulse power rating and 22.5 V clamping voltage enable direct compliance without additional series components, making it appropriate for outdoor telecom and transportation infrastructure applications.
Does the 1N5638A/TR have a hermetic package, and why does that matter?
Yes, the 1N5638A/TR uses a hermetically sealed DO-13 (DO-202AA) metal-glass package. This construction prevents moisture ingress, eliminates outgassing in vacuum environments, and ensures long-term parameter stability under thermal cycling and high-humidity conditions-critical for avionics, downhole tools, and space-qualified systems where failure modes must be eliminated.
What is the standoff voltage (VWM) of the 1N5638A/TR, and how does it relate to system design?
The 1N5638A/TR has a rated standoff voltage (VWM) of 13.6 V, meaning it remains nonconductive below this reverse voltage with leakage current ≤5 µA. This value is selected to exceed typical 12 V nominal rail voltages while providing sufficient margin against ripple and tolerance stack-up-ensuring reliable operation without false triggering during normal system operation.
How does the 1N5638A/TR differ from the commercial 1N5638/TR variant?
The 1N5638A/TR differs from the commercial 1N5638/TR primarily in tighter parameter tolerances and JANTXV qualification per MIL-PRF-19500/500. Its breakdown voltage range is 15.2–16.8 V versus 15.2–17.6 V for the TR variant, and it undergoes rigorous screening for high-reliability applications. Both share identical package, clamping voltage, and surge ratings.
1N5638A/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):
- 13.6V
- Voltage - Breakdown (Min):
- 15.2V
- Voltage - Clamping (Max) @ Ipp:
- 22.5V
- Current - Peak Pulse (10/1000µs):
- 67A
- 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
1N5638A/TR FAQ
1.How can I place an order for 1N5638A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5638A/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 1N5638A/TR reliable?
The price and inventory of 1N5638A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5638A/TR is usually 5 days.
3.What payment methods are accepted for 1N5638A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5638A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5638A/TR?
1N5638A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5638A/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 1N5638A/TR?
For technical support, including 1N5638A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5638A/TR requirements.
6.How does Aetrix verify that 1N5638A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5638A/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 1N5638A/TR meets industry standards.
7.What is the process for return or replacement of 1N5638A/TR?
All 1N5638A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5638A/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 1N5638A/TR part is unused and in its original packaging.
Return procedure for 1N5638A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5638A/TR Tags
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