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Microchip Technology 1N5637A/TR
- Part No.:
- 1N5637A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-202AA, DO-13, Axial
- Datasheet:
-
1N5637A/TR.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:8,656
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Product details
Overview
1N5637A/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), 14.3 V minimum breakdown voltage (V(BR)), 21.2 V maximum clamping voltage (VC) at 71 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5637A/TR datasheet, 1N5637A/TR pinout, 1N5637A/TR application, or 1N5637A/TR equivalent, this device is selected for IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, and secondary lightning protection (IEC 61000-4-5) in environments requiring radiation-hardened, military-grade transient suppression with sub-100 ps response time and operation from –55°C to +175°C.
Technical Context
The 1N5637A/TR operates as a unidirectional avalanche diode, entering controlled breakdown when transient voltage exceeds its V(BR) of 14.3–15.8 V, clamping the line to ≤21.2 V while diverting up to 71 A. Its DO-13 metal-glass package provides hermetic sealing and low thermal resistance (50°C/W junction-to-lead), enabling stable performance under repeated surge stress and extreme temperature cycling.
It complies with MIL-PRF-19500/500 for JANTXV qualification when ordered with prefix (e.g., JANTXV1N5637A), supports 200 A forward surge current (8.3 ms half-sine), and exhibits a +0.084%/°C temperature coefficient of V(BR), ensuring predictable voltage drift across operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Rated Standoff Voltage) | 12.1 V - Maximum continuous reverse voltage before leakage exceeds 5 µA; sets minimum system operating margin. |
| V(BR) @ I(BR) | 14.3–15.8 V @ 1 mA - Breakdown threshold defining onset of avalanche conduction during transients. |
| VC @ IPP | 21.2 V @ 71 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum overvoltage exposure. |
| PPP (Peak Pulse Power) | 1500 W - Sustained surge energy handling capability without failure under standard test conditions. |
| Response Time | <100 ps - Enables effective suppression of ESD events (IEC 61000-4-2) and fast-rising EFT bursts (IEC 61000-4-4). |
| Operating Temperature | –55°C to +175°C - Supports deployment in engine compartments, avionics bays, and downhole industrial equipment. |
| Package | DO-13 (DO-202AA) - Hermetically sealed metal-glass case with cathode-connected case and tin-lead plating for reliable through-hole soldering. |
Pinout & Package
DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically connected to the metal case and marked by diode symbol on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point | Connected to protected line; conducts surge current into cathode/case during reverse avalanche. |
| Cathode (Lead 1 / Case) | Transient current return path | Internally bonded to metal case; must be connected to system ground plane for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise DC-biased line protection without affecting normal forward conduction paths. |
| 1500 W peak pulse power (10/1000 µs) | Handles high-energy surges from inductive switching or lightning-induced coupling without degradation. |
| Hermetic DO-13 metal package | Provides long-term reliability in humid, corrosive, or vacuum environments where plastic packages fail. |
| JANTXV qualification option | Meets MIL-PRF-19500/500 requirements for aerospace and defense programs requiring traceable, screened parts. |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050, suitable for space-qualified subsystems. |
Applications
| Aerospace Avionics Power Bus Protection | Industrial Motor Drive Control Inputs |
|---|---|
Use Scenario: Protecting 12 V DC power distribution lines in airborne navigation computers against induced RF and secondary lightning surges per IEC 61000-4-5 (42 Ω source, Class 4). IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient overvoltage on primary power rail. Use Value: Limits bus voltage to ≤21.2 V during 71 A surges, preventing latch-up or damage to downstream DC-DC converters and FPGAs. |
Use Scenario: Safeguarding isolated digital inputs on PLC modules exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Transient suppressor on 24 V control signal lines interfacing with field devices. Use Value: Responds in <100 ps to clamp EFT bursts (IEC 61000-4-4) and switching transients, preserving signal integrity and MCU input stage reliability. |
| Military Vehicle Data Link Interfaces | Downhole Oil & Gas Sensor Electronics |
Use Scenario: Shielding RS-485 transceivers in armored vehicle communication systems from ESD (IEC 61000-4-2 ±15 kV air, ±8 kV contact) and conducted surges. IC Role / Device Role / Timing Role: Line-side TVS on differential data pairs referenced to chassis ground. Use Value: Maintains signal eye diagram integrity by limiting transient excursion to 21.2 V while surviving repeated 1500 W pulses without parameter shift. |
Use Scenario: Protecting analog sensor front-ends (e.g., pressure, temperature) in high-temperature wellhead controllers subjected to thermal cycling and EMI. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12–24 V sensor supply rails operating at 175°C ambient. Use Value: Delivers stable clamping performance across –55°C to +175°C with no derating required, unlike polymer-based TVS alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ12A | Surface-mount SMC package; 12 V VWM, 20.1 V VC @ 75.5 A; lower thermal resistance (junction-to-ambient) but non-hermetic plastic body. | Preferred for automated PCB assembly and space-constrained designs; unsuitable for vacuum or high-humidity military deployments. | Select SMCJ12A only when board-level automation and footprint reduction outweigh hermeticity and radiation tolerance requirements. |
| 1N5637 | Commercial-grade version without "A" tolerance band; V(BR) min/max spread widened to 13.5–16.5 V vs. 14.3–15.8 V; no JANTXV qualification path. | Acceptable for cost-sensitive industrial controls where tighter V(BR) matching and military screening are unnecessary. | Choose 1N5637 only for non-mission-critical applications where ±5% V(BR) variation and absence of MIL-spec screening are acceptable. |
Compared with SMCJ12A and 1N5637, the 1N5637A/TR delivers superior environmental robustness via hermetic DO-13 packaging and tighter parametric control, making it the sole choice for avionics, defense electronics, and high-reliability downhole systems where long-term stability under thermal, mechanical, and radiation stress is mandatory.
Availability
1N5637A/TR is available at Aetrix Electronics and suitable for aerospace avionics, industrial motor drives, military vehicle data links, and downhole oil & gas sensor electronics requiring stable component supply across extended temperature ranges and harsh environmental conditions.
Supply support for 1N5637A/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 manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5637A/TR belongs to Microchip's legacy TVS diode family engineered for mission-critical transient suppression-designed specifically to meet MIL-PRF-19500/500 requirements and operate reliably in extreme thermal, mechanical, and radiation environments.
FAQ
What is the clamping voltage of the 1N5637A/TR under a 10/1000 µs surge?
The 1N5637A/TR has a maximum clamping voltage (VC) of 21.2 V when subjected to its rated peak pulse current of 71 A under the 10/1000 µs waveform. This value is measured at 25°C and defines the upper voltage limit imposed on the protected circuit during transient events, ensuring downstream ICs remain within safe operating limits.
Is the 1N5637A/TR suitable for IEC 61000-4-5 secondary lightning protection?
Yes, the 1N5637A/TR is explicitly rated for secondary lightning protection per IEC 61000-4-5 with 2 Ω, 12 Ω, and 42 Ω source impedances. For 42 Ω source impedance, it supports Class 4 protection; for 12 Ω, Class 1; and for 2 Ω, Class 2-making it applicable across multiple severity levels in industrial and transportation infrastructure.
Does the 1N5637A/TR have military qualification options?
Yes, the 1N5637A/TR is the commercial "A"-suffix variant that serves as the base for JANTXV qualification. When ordered as JANTXV1N5637A, it meets MIL-PRF-19500/500 requirements including screening, lot traceability, and enhanced reliability testing-commonly used in U.S. Department of Defense avionics and vehicle electronics.
What is the thermal resistance of the 1N5637A/TR and how does it affect layout?
The 1N5637A/TR has a junction-to-lead thermal resistance of 50°C/W when measured at 0.375 inches (10 mm) from the case. This low value requires direct thermal coupling of the cathode (case) to a large copper pour or heatsink; PCB layout must minimize lead length and maximize copper area under the DO-13 body to sustain repetitive surge duty cycles without thermal runaway.
How does the "TR" suffix in 1N5637A/TR impact ordering and packaging?
The "TR" suffix indicates tape-and-reel packaging per EIA-296 standards, enabling automated pick-and-place assembly. The 1N5637A/TR is supplied in reels compatible with standard SMT feeders, with part marking and polarity preserved per JEDEC DO-13 orientation-no manual orientation or rework is needed during high-volume manufacturing.
1N5637A/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):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 71A
- 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)
1N5637A/TR FAQ
1.How can I place an order for 1N5637A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5637A/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 1N5637A/TR reliable?
The price and inventory of 1N5637A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5637A/TR is usually 5 days.
3.What payment methods are accepted for 1N5637A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5637A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5637A/TR?
1N5637A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5637A/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 1N5637A/TR?
For technical support, including 1N5637A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5637A/TR requirements.
6.How does Aetrix verify that 1N5637A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5637A/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 1N5637A/TR meets industry standards.
7.What is the process for return or replacement of 1N5637A/TR?
All 1N5637A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5637A/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 1N5637A/TR part is unused and in its original packaging.
Return procedure for 1N5637A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5637A/TR Tags
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