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Microchip Technology 1N5638A
- Part No.:
- 1N5638A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5638A.pdf
- Description:
- TVS DIODE 13.6VWM 22.5VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:6,496
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Product details
Overview
1N5638A 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 datasheet, 1N5638A pinout, 1N5638A application, or 1N5638A equivalent, this device serves as a military-grade, radiation-hardened TVS for secondary lightning protection (IEC61000-4-5 Class 4 with 2 Ω source), ESD/EFT suppression (IEC61000-4-2/-4), and inductive switching transient clamping in avionics power rails and control interfaces.
Technical Context
The 1N5638A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 15.2–16.8 V V(BR) range at 1 mA test current. Its response time is under 100 ps, enabling sub-nanosecond clamping of fast transients without parasitic delay.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs), with thermal resistance of 50 °C/W junction-to-lead and operational temperature range from –55 °C to +175 °C - supporting deployment in extreme-environment avionics and downhole industrial electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13.6 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA; sets minimum system rail margin for safe standby operation. |
| V(BR) min/max | 15.2 V / 16.8 V @ 1 mA - defines guaranteed avalanche onset window; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPP | 22.5 V @ 67 A - clamping voltage during full 1500 W surge; determines worst-case overvoltage seen by protected ICs. |
| IPP | 67 A - peak current supported at rated clamping voltage; correlates directly to IEC61000-4-5 Class 4 (2 Ω source) surge capability. |
| PPP | 1500 W @ 10/1000 µs - standardized surge energy handling; enables direct comparison with competing TVS devices under identical test conditions. |
| Response Time | <100 ps - enables effective suppression of ESD events (IEC61000-4-2) and fast-rising RF-induced transients without signal distortion. |
| Operating Temp | –55 °C to +175 °C - supports deployment in jet engine bays, satellite power systems, and oilfield instrumentation without derating. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with tin-lead plating; cathode connected to case and marked with diode symbol; weight ≈ 1.4 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; must be routed with low-inductance path to ground reference for effective clamping. |
| Cathode | Reverse-biased avalanche terminal | Internally bonded to metal case; requires direct mechanical and electrical connection to chassis or system ground plane for optimal surge current return path. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-13 metal package | Enables long-term reliability in high-humidity, high-vibration, and radiation-exposed environments such as airborne avionics and space-qualified subsystems. |
| 1500 W peak pulse power | Supports robust protection against IEC61000-4-5 secondary lightning surges up to Class 4 (2 Ω source impedance) without degradation or failure. |
| <100 ps response time | Clamps ESD events (±8 kV contact, ±15 kV air per IEC61000-4-2) before sensitive CMOS inputs experience latch-up or gate oxide damage. |
| MIL-PRF-19500/500 qualified | Available as JANTXV1N5638A with tighter tolerances and full military screening - required for DoD and NASA flight-critical hardware procurement. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050; suitable for use in low-earth orbit (LEO) satellites and nuclear instrumentation where TID tolerance exceeds 100 krad(Si). |
Applications
| Aerospace Power Bus Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 12 V DC power distribution networks in commercial aircraft avionics bays from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between bus rail and chassis ground to clamp transients exceeding 13.6 V standoff level. Use Value: Limits bus overvoltage to ≤22.5 V during 67 A surges, preventing damage to MIL-STD-704-compliant DC-DC converters and ARINC 429 interface ICs. |
Use Scenario: Safeguarding gate drivers and microcontrollers in variable-frequency drives subjected to IGBT switching noise and back-EMF spikes. IC Role / Device Role / Timing Role: Mounted across motor controller supply rails to absorb repetitive 10/1000 µs transients generated by PWM commutation. Use Value: Maintains system uptime by preventing false resets and latch-up in STM32H7-based motion controllers during 1500 W surge events. |
| Downhole Oilfield Instrumentation | Military Vehicle Data Links |
|
Use Scenario: Shielding RS-485 transceivers and sensor front-ends in borehole telemetry tools exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; 1N5638A used in unidirectional configuration on VCC line with cathode grounded. Use Value: Survives –55 °C to +175 °C thermal cycling and 100 krad(Si) total ionizing dose while maintaining clamping performance per IEC61000-4-5 Class 3 (12 Ω source). |
Use Scenario: Hardening CAN FD and MIL-STD-1553B data buses in armored vehicle electronics against EMP and ESD in field-deployed C4ISR systems. IC Role / Device Role / Timing Role: Placed on bus lines adjacent to connector entry points to shunt fast transients before reaching PHY layer ICs. Use Value: Delivers <100 ps response and 22.5 V clamping to preserve signal integrity on 5 Mbps CAN FD links during ±25 kV ESD discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ13A | Surface-mount SMC package; 13 V VWM; 21.5 V VC @ 69.8 A; same 1500 W rating but lower thermal resistance (junction-to-ambient). | Used where PCB space is constrained and automated assembly is required; lacks hermetic seal and radiation hardness. | Select SMCJ13A for cost-sensitive industrial controls; avoid in aerospace or radiation-prone environments where 1N5638A's DO-13 metal package is mandatory. |
| 1N5638 | Commercial-grade version; same VWM (13.6 V) and VC (22.5 V), but wider V(BR) tolerance (14.4–17.6 V vs. 15.2–16.8 V) and no MIL-PRF-19500 qualification. | Suitable for non-mission-critical applications where military screening and tight parametric limits are unnecessary. | Choose 1N5638 for prototyping or commercial avionics subsystems; specify 1N5638A only when JANTXV-level reliability and radiation tolerance are contractually required. |
Compared with SMCJ13A and 1N5638, the 1N5638A uniquely combines hermetic DO-13 packaging, MIL-PRF-19500/500 qualification, and inherent radiation hardness - making it irreplaceable in flight-critical, space-grade, and nuclear instrumentation designs where long-term parametric stability under extreme stress is non-negotiable.
Availability
1N5638A is available at Aetrix Electronics and suitable for aerospace power bus protection, industrial motor drive control, downhole oilfield instrumentation, and military vehicle data links requiring stable component supply across extended product lifecycles.
Supply support for 1N5638A 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 belongs to Microchip's legacy TVS diode family engineered for mission-critical surge immunity - emphasizing hermetic packaging, military qualification, and performance validation under extreme thermal, mechanical, and radiation stress.
FAQ
What is the standoff voltage (VWM) of the 1N5638A?
The 1N5638A has a rated standoff voltage (VWM) of 13.6 V, meaning it remains in high-impedance state below this reverse voltage while leaking less than 5 µA. This value is selected to match nominal 12 V systems with sufficient margin above operating rail to avoid false triggering during normal operation, and is confirmed in the Electrical Characteristics table on page 3 of the T4-LDS-0096 datasheet for the 1N5638A variant.
How does the 1N5638A differ from the commercial 1N5638?
The 1N5638A differs from the 1N5638 in tighter parametric tolerances (e.g., V(BR) 15.2–16.8 V vs. 14.4–17.6 V), full MIL-PRF-19500/500 qualification including screening for JANTXV-grade reliability, and guaranteed radiation hardness per MicroNote 050. The 1N5638A is required for defense and space applications where the base 1N5638 does not meet contractual environmental or lifetime assurance requirements.
Is the 1N5638A suitable for IEC61000-4-5 Class 4 lightning surge protection?
Yes, the 1N5638A is explicitly rated for IEC61000-4-5 Class 4 secondary lightning protection with 2 Ω source impedance, as documented on page 2 of the datasheet. Its 67 A peak pulse current (IPP) and 22.5 V clamping voltage (VC) ensure compliance when deployed with appropriate PCB layout - specifically, low-inductance grounding of the cathode to chassis - to handle the 1 kV/0.5 Ω open-circuit test waveform.
What is the thermal resistance of the 1N5638A and how does it affect layout?
The 1N5638A has a junction-to-lead thermal resistance of 50 °C/W when measured at 10 mm from the case, per page 2 of the datasheet. This requires mounting the DO-13 package with ≥0.375 inch (10 mm) lead length outside the PCB body and using wide copper pours tied directly to the cathode (case) for heat sinking. Failure to observe this degrades surge endurance and may cause thermal runaway during repetitive transients.
Can the 1N5638A be used for ESD protection per IEC61000-4-2?
Yes, the 1N5638A is validated for ESD protection per IEC61000-4-2 due to its sub-100 ps response time and ability to clamp ±8 kV contact and ±15 kV air discharges without degradation. Its 22.5 V clamping voltage ensures downstream logic ICs (e.g., FPGA I/O banks or MCU GPIOs) remain within absolute maximum ratings during ESD events, provided the device is placed within 2 cm of the protected connector per layout guidelines in Microsemi Application Note AN-401.
1N5638A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for 1N5638A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5638A 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 reliable?
The price and inventory of 1N5638A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5638A is usually 5 days.
3.What payment methods are accepted for 1N5638A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5638A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5638A?
1N5638A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5638A 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?
For technical support, including 1N5638A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5638A requirements.
6.How does Aetrix verify that 1N5638A is sourced from the original manufacturer or authorized distributors?
All 1N5638A 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 meets industry standards.
7.What is the process for return or replacement of 1N5638A?
All 1N5638A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5638A, 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 part is unused and in its original packaging.
Return procedure for 1N5638A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5638A Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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