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Microchip Technology 1N5637/TR
- Part No.:
- 1N5637/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-202AA, DO-13, Axial
- Datasheet:
-
1N5637/TR.pdf
- Description:
- TVS DIODE 12.1VWM 22VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:4,322
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Product details
Overview
1N5637/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 12.1 V rated standoff voltage (VWM), 13.5 V minimum breakdown voltage (V(BR)), 22.0 V maximum clamping voltage (VC) at 68 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5637/TR datasheet, 1N5637/TR pinout, 1N5637/TR application, or 1N5637/TR equivalent, this device is selected for ESD/EFT protection per IEC 61000-4-2/-4-4, secondary lightning protection per IEC 61000-4-5 (with 42 Ω, 12 Ω, or 2 Ω source impedance), and fast-clamp (<100 ps) transient suppression in harsh thermal environments (-55°C to +175°C).
Technical Context
The 1N5637/TR operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 13.5–14.3 V V(BR) range at 1 mA test current. Its clamping action limits transients to ≤22.0 V at 68 A IPP, enabling robust protection of downstream circuitry without latch-up or degradation under repetitive surges.
Designed for through-hole mounting in the DO-13 (DO-202AA) hermetic metal-glass package, it delivers 50°C/W junction-to-lead thermal resistance and supports forward surge current up to 200 A (8.3 ms half-sine). Its cathode is internally connected to the case, with polarity marked by a diode symbol on the body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.1 V - Maximum continuous reverse operating voltage before conduction begins; must exceed system DC bus or signal rail voltage. |
| V(BR) min/max | 13.5 V / 14.3 V @ 1 mA - Breakdown threshold range defining reliable avalanche onset; tight tolerance enables precise overvoltage margining. |
| VC @ IPP | 22.0 V @ 68 A - Maximum clamped voltage during 10/1000 µs surge; determines worst-case stress on protected ICs or interfaces. |
| PPP | 1500 W - Peak pulse power handling capability; defines survivability against high-energy transients like inductive switch-off or lightning-induced surges. |
| Response time | <100 ps - Near-instantaneous clamping ensures protection of sensitive analog or digital inputs before damage occurs. |
| Operating temp | -55°C to +175°C - Enables deployment in engine compartments, avionics bays, and industrial control cabinets without derating. |
| Package | DO-13 (DO-202AA) - Hermetically sealed metal-glass construction provides superior moisture resistance and long-term reliability vs. plastic packages. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with tin-lead plated 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 sink input | Connected to protected line (e.g., power rail or signal); conducts surge current into cathode/case during avalanche. |
| Cathode (Lead 1 / Case) | Reference return path | Internally tied to metal case; must be connected to low-impedance ground plane or chassis to ensure effective clamping and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Protects only reverse-polarity transients while allowing normal forward-biased operation of upstream rectifiers or circuits. |
| 1500 W peak pulse power (10/1000 µs) | Withstands high-energy surges common in motor drives, relay coils, and power distribution without failure or parameter shift. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and outgassing risks critical for space, aviation, and military applications requiring MIL-PRF-19500 compliance. |
| IEC 61000-4-2/-4-4/-4-5 certified performance | Validated for ESD (±8 kV contact), EFT (±2 kV), and secondary lightning (up to Class 4 with 2 Ω source) per published test data. |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for low-earth orbit (LEO) satellite subsystems and nuclear instrumentation. |
Applications
| Aerospace Power Distribution | Avionics Signal Line Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus lines in aircraft electrical systems from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Standoff-mode TVS diode placed between bus and chassis ground, clamping surges within 100 ps to prevent regulator latch-up or MOSFET gate oxide damage. Use Value: Maintains system uptime during flight-critical events by limiting bus voltage to ≤22.0 V during 68 A transients, preserving MIL-STD-704 compliance. |
Use Scenario: Safeguarding ARINC 429 data receivers from ESD and RF-induced transients on airborne communication buses. IC Role / Device Role / Timing Role: Unidirectional clamp on receiver input pins, referenced to aircraft chassis ground, suppressing ±15 kV ESD per IEC 61000-4-2. Use Value: Prevents bit errors and receiver lockup by clamping induced voltages below logic threshold while maintaining signal integrity at 100 kHz data rates. |
| Industrial Motor Control | Military Vehicle Electronics |
Use Scenario: Shielding PLC I/O modules from back-EMF spikes generated by solenoid valves and AC contactors in factory automation. IC Role / Device Role / Timing Role: Primary surge suppressor across 24 V DC supply rails, mounted directly at connector entry point with short ground path to PCB ground plane. Use Value: Extends module MTBF by absorbing 1500 W transients without degradation, meeting IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) requirements. |
Use Scenario: Hardening vehicle-mounted radios and navigation units against EMP-like transients from ignition systems and alternator load dumps. IC Role / Device Role / Timing Role: MIL-qualified unidirectional TVS (JANTXV variant available) installed on power entry board with hermetic DO-13 package ensuring long-term reliability in vibration-prone environments. Use Value: Guarantees uninterrupted operation under MIL-STD-461 RS103 and DO-160 Section 22 radiated susceptibility tests due to sub-100 ps response and radiation hardness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5637A/TR | Tighter V(BR) tolerance (13.5–14.3 V vs. 13.5–14.4 V); same DO-13 package and electrical specs. | Preferred for designs requiring tighter breakdown consistency across temperature and production lots. | Select 1N5637A/TR when V(BR) matching across units is critical for multi-channel parallel clamping or precision threshold setting. |
| SMCJ12A | Surface-mount SMC package; 12 V VWM, 13.3 V V(BR), 19.9 V VC @ 75.4 A; 1500 W rating. | Better suited for high-density PCBs where through-hole footprint is prohibitive; lacks hermetic sealing and radiation hardness. | Choose SMCJ12A only for commercial-grade, space-constrained applications where DO-13 mechanical robustness and radiation tolerance are not required. |
Compared with 1N5637/TR, the 1N5637A/TR offers improved V(BR) consistency for mission-critical redundancy schemes, while SMCJ12A trades hermetic reliability and radiation hardness for compactness-making 1N5637/TR the sole choice for aerospace, defense, and high-temperature industrial deployments.
Availability
1N5637/TR is available at Aetrix Electronics and suitable for aerospace power distribution, avionics signal protection, and industrial motor control applications requiring stable component supply, long-term obsolescence management, and traceable military-grade sourcing.
Supply support for 1N5637/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 global semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5637/TR belongs to Microchip's legacy JAN/JANTXV-qualified TVS diode family, engineered specifically for extreme-environment transient suppression where hermeticity, radiation tolerance, and MIL-PRF-19500 compliance are mandatory.
FAQ
What is the standoff voltage (VWM) of the 1N5637/TR and how does it relate to system design?
The 1N5637/TR has a rated standoff voltage (VWM) of 12.1 V, meaning it remains nonconductive up to this reverse voltage level. In system design, VWM must be ≥ the maximum continuous operating voltage of the protected line-e.g., for a 12 V nominal rail, 12.1 V ensures no leakage current during normal operation while allowing headroom for ripple and tolerance. Exceeding VWM risks premature conduction and thermal runaway.
Does the 1N5637/TR meet IEC 61000-4-5 for lightning surge immunity, and at which test levels?
Yes, the 1N5637/TR is validated for secondary lightning protection per IEC 61000-4-5: it supports Class 4 testing with 42 Ω source impedance (1N5629–1N5648A group), Class 4 with 12 Ω (1N5629–1N5636A), and Class 3 with 2 Ω (1N5629–1N5635A). Its 22.0 V clamping voltage at 68 A ensures protected circuits remain within safe operating limits during these standardized surge events.
Is the 1N5637/TR suitable for high-temperature environments such as engine control units?
Yes, the 1N5637/TR is rated for operation from -55°C to +175°C and features a DO-13 hermetic metal package with 50°C/W junction-to-lead thermal resistance. This makes it ideal for under-hood automotive ECUs, turbine controllers, and other high-temperature industrial applications where plastic-packaged TVS devices would degrade or fail prematurely.
How is polarity marked on the 1N5637/TR, and what is the internal connection of the cathode?
The 1N5637/TR uses a diode symbol marking on the metal case to indicate cathode polarity, and Lead 1 (cathode) is electrically connected to the case per JEDEC DO-13 specification. This requires the case to be soldered to a low-impedance ground plane or chassis-never left floating-to ensure proper clamping performance and thermal dissipation during surge events.
What is the peak pulse current (IPP) rating of the 1N5637/TR, and how is it measured?
The 1N5637/TR has a peak pulse current (IPP) rating of 68 A, measured under the standard 10/1000 µs double-exponential surge waveform defined in IEC 61000-4-5. This value corresponds to the current at which the device clamps to its maximum specified voltage (VC = 22.0 V), yielding the 1500 W peak pulse power rating (VC × IPP). It is verified at 25°C lead temperature with ≤0.01% duty cycle.
1N5637/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-202AA, DO-13, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12.1V
- Voltage - Breakdown (Min):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 68A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-13 (DO-202AA)
1N5637/TR FAQ
1.How can I place an order for 1N5637/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5637/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 1N5637/TR reliable?
The price and inventory of 1N5637/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5637/TR is usually 5 days.
3.What payment methods are accepted for 1N5637/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5637/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5637/TR?
1N5637/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5637/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 1N5637/TR?
For technical support, including 1N5637/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5637/TR requirements.
6.How does Aetrix verify that 1N5637/TR is sourced from the original manufacturer or authorized distributors?
All 1N5637/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 1N5637/TR meets industry standards.
7.What is the process for return or replacement of 1N5637/TR?
All 1N5637/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5637/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 1N5637/TR part is unused and in its original packaging.
Return procedure for 1N5637/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5637/TR Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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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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Diodes Incorporated
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