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Microchip Technology 1N5637AE3
- Part No.:
- 1N5637AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-202AA, DO-13, Axial
- Datasheet:
-
1N5637AE3.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:4,558
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Product details
Overview
1N5637AE3 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 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 1N5637AE3 datasheet, 1N5637AE3 pinout, 1N5637AE3 application, or 1N5637AE3 equivalent, this device serves as a military-grade, radiation-hardened TVS for secondary lightning protection (IEC61000-4-5 Class 4 with 42 Ω source), ESD/EFT suppression (IEC61000-4-2/-4), and inductive switching transient suppression in avionics power rails and sensor interfaces.
Technical Context
The 1N5637AE3 operates as a unidirectional avalanche diode, entering controlled breakdown when transient voltage exceeds its V(BR) of 13.5–14.3 V at 1 mA test current. Its clamping action limits downstream circuit voltage to ≤22.0 V under 68 A 10/1000 µs pulses, delivering 1500 W peak pulse power with <100 ps response time.
It is hermetically sealed in a DO-13 (DO-202AA) metal-glass package with cathode connected to case, rated for -55°C to +175°C operation, and qualified to MIL-PRF-19500/500 for JANTXV-level reliability. Thermal resistance is 50°C/W junction-to-lead at 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 12.1 V - Maximum continuous reverse voltage before leakage exceeds 5 µA; sets operating margin above nominal 12 V rail. |
| V(BR) Min/Max | 13.5 V / 14.3 V @ 1 mA - Ensures reliable avalanche initiation across temperature and lot variation. |
| VC @ IPP | 22.0 V @ 68 A - Clamps transients to safe level for downstream 24 V logic or analog ICs during IEC61000-4-5 surges. |
| PPP | 1500 W @ 10/1000 µs - Sustains high-energy inductive kickback (e.g., solenoid de-energization) without failure. |
| Response Time | <100 ps - Faster than most semiconductor switches; prevents ESD damage to sensitive inputs before protection activates. |
| Operating Temp | -55°C to +175°C - Supports deployment in engine control units, downhole tools, and avionics bays without derating. |
| Radiation Hardness | Inherently radiation hard per MicroNote 050 - Validated for total ionizing dose (TID) tolerance in space and nuclear environments. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with tin-lead plated leads; cathode electrically connected to case; polarity marked by diode symbol on body; weight ≈1.4 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse surge | Connected to protected line (e.g., 12 V supply rail); must be routed with low-inductance trace to minimize overshoot. |
| Cathode (Lead 1 / Case) | Clamped return path to ground or reference | Case is cathode - requires direct low-impedance connection to system ground plane; mounting torque and thermal interface affect clamping consistency. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Blocks reverse transients only - preserves forward-biased signal integrity in DC power paths without affecting normal operation. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and long-term parameter drift; enables >20-year field life in humid or corrosive environments. |
| JANTXV qualification | Fulfills MIL-PRF-19500/500 requirements for screening, testing, and traceability - mandatory for DoD and FAA-certified avionics. |
| IEC61000-4-5 Class 4 compliance (42 Ω) | Validated for 4 kV surge immunity in telecom and industrial control cabinets using standard coupling network impedance. |
| 0.084 %/°C V(BR) tempco | Predictable voltage shift over temperature - simplifies margin analysis for worst-case clamping across full operating range. |
Applications
| Aerospace Power Distribution | Industrial Motor Control |
|---|---|
Use Scenario: Protection of 12 V DC bus feeding flight-critical sensors and actuators in UAVs and satellites. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly at power entry point to absorb induced RF and secondary lightning surges. Use Value: Prevents latch-up or burnout in downstream DC-DC converters and microcontrollers during ESD events and MIL-STD-461 RS103 exposure. |
Use Scenario: Suppressing inductive kickback from 24 V solenoid valves and contactors in PLC I/O modules. IC Role / Device Role / Timing Role: Fast-acting transient shunt mounted across coil terminals to limit flyback voltage to ≤22 V. Use Value: Extends relay contact life and eliminates false triggering of optocoupled inputs caused by >100 V spikes. |
| Avionics Sensor Interfaces | Military Vehicle Electronics |
Use Scenario: Shielding analog pressure and temperature transducer outputs in cockpit instrumentation. IC Role / Device Role / Timing Role: Low-leakage TVS (5 µA @ 12.1 V) placed at connector entry to guard against EFT bursts and cable discharge events. Use Value: Maintains sub-mV signal integrity while surviving 4 kV ESD per IEC61000-4-2 Contact Discharge without parametric shift. |
Use Scenario: Protecting CAN bus power lines and ignition control circuits in armored vehicle ECUs exposed to EMP and load dump. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of TVS arrays and polymeric PTCs in 28 V DC distribution networks. Use Value: Withstands 1500 W pulses without degradation, ensuring mission-critical subsystems remain operational after multiple surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5637A | No "E3" suffix - standard tin-lead finish per MIL-STD-750 Method 2026, not RoHS-compliant. | Same electrical specs and DO-13 package; used where Pb-free is not mandated (e.g., legacy defense programs). | Select 1N5637A if RoHS exemption applies and legacy solder process compatibility is required. |
| SMBJ12A | Surface-mount SMB package; 12 V VWM; 19.9 V VC @ 62.3 A; 600 W PPP; plastic encapsulation. | Limited to commercial-temp (-65°C to +150°C); no radiation hardness or MIL qualification; unsuitable for hermetic avionics. | Choose SMBJ12A only for cost-sensitive, non-military industrial PCBs where board space and reflow assembly outweigh reliability needs. |
Compared with 1N5637AE3, the 1N5637A offers identical performance with conventional finish, while SMBJ12A trades military ruggedness and radiation tolerance for compact size and lower cost - making 1N5637AE3 the sole choice for certified airborne and space-grade designs requiring hermeticity and JANTXV traceability.
Availability
1N5637AE3 is available at Aetrix Electronics and suitable for aerospace power distribution, industrial motor control, avionics sensor interfaces, and military vehicle electronics requiring stable component supply with full MIL-qualified traceability and long-term obsolescence management.
Supply support for 1N5637AE3 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 acquired Microsemi in 2018 and now manufactures high-reliability discrete semiconductors including radiation-hardened and military-qualified TVS diodes for critical infrastructure.
The 1N5637AE3 belongs to Microchip's legacy Microsemi TVS family, engineered specifically for aerospace, defense, and energy applications demanding hermetic packaging, extreme temperature resilience, and IEC/MIL-standard surge immunity.
FAQ
What is the maximum clamping voltage of the 1N5637AE3 under a 10/1000 µs surge?
The 1N5637AE3 has a maximum clamping voltage (VC) of 22.0 V when subjected to its rated 68 A peak pulse current under the 10/1000 µs waveform. This value is guaranteed across temperature and lot variation per the T4-LDS-0096 datasheet, ensuring consistent protection for 12 V systems without overstressing downstream components.
Is the 1N5637AE3 RoHS-compliant?
Yes, the "E3" suffix on 1N5637AE3 indicates a RoHS-compliant, lead-free finish per JEDEC J-STD-609. Unlike the non-suffix 1N5637A, the 1N5637AE3 uses matte tin plating instead of tin-lead, meeting EU Directive 2011/65/EU while retaining full MIL-PRF-19500/500 qualification and hermetic DO-13 construction.
How does the 1N5637AE3 differ from bidirectional TVS diodes like the 1N6036 series?
The 1N5637AE3 is unidirectional - it conducts only during reverse-voltage transients and blocks forward current, making it ideal for DC power line protection. In contrast, the 1N6036 series is bidirectional and symmetric, suited for AC lines or data lines with bipolar signals. Using 1N5637AE3 on AC paths would cause forward conduction and failure.
Can the 1N5637AE3 be used for primary lightning protection per IEC61000-4-5?
No, the 1N5637AE3 is specified for secondary lightning protection only (IEC61000-4-5 with 2–42 Ω source impedance). Its 1500 W rating and 22.0 V clamping are insufficient for direct lightning injection. Primary protection requires higher-energy MOVs or gas discharge tubes upstream; the 1N5637AE3 serves as the final-stage clamp after coarse protection.
What is the thermal resistance specification for the 1N5637AE3?
The 1N5637AE3 has a junction-to-lead thermal resistance (RθJL) of 50°C/W when measured at 10 mm (0.375 in) from the case, per the datasheet's Maximum Ratings table. This value assumes proper mechanical mounting - inadequate heatsinking or excessive lead length will degrade clamping performance during repetitive surges.
1N5637AE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-202AA, DO-13, Axial
- Series:
- -
- Packaging:
- Bulk
- 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)
1N5637AE3 FAQ
1.How can I place an order for 1N5637AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5637AE3 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 1N5637AE3 reliable?
The price and inventory of 1N5637AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5637AE3 is usually 5 days.
3.What payment methods are accepted for 1N5637AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5637AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5637AE3?
1N5637AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5637AE3 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 1N5637AE3?
For technical support, including 1N5637AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5637AE3 requirements.
6.How does Aetrix verify that 1N5637AE3 is sourced from the original manufacturer or authorized distributors?
All 1N5637AE3 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 1N5637AE3 meets industry standards.
7.What is the process for return or replacement of 1N5637AE3?
All 1N5637AE3 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5637AE3, 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 1N5637AE3 part is unused and in its original packaging.
Return procedure for 1N5637AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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