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Microchip Technology 1N5631A
- Part No.:
- 1N5631A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5631A.pdf
- Description:
- TVS DIODE 7.02VWM 12.1VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:8,730
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Product details
Overview
1N5631A 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 7.38 V minimum breakdown voltage (VBR), 6.63 V rated standoff voltage (VWM), 12.5 V maximum clamping voltage (VC) at 120 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the 1N5631A datasheet, 1N5631A pinout, 1N5631A application, or 1N5631A equivalent, this device delivers sub-100 ps response time, radiation-hardened performance per MicroNote 050, and IEC 61000-4-2/4-4/4-5 compliance for ESD, EFT, and secondary lightning protection in harsh environments.
Technical Context
The 1N5631A operates as a unidirectional avalanche diode, entering controlled breakdown above its 6.63 V standoff voltage to clamp transients while maintaining low leakage (<200 µA at VWM). Its DO-13 package provides hermetic sealing and thermal resistance of 50°C/W junction-to-lead, enabling operation from –55°C to +175°C.
It delivers 120 A peak pulse current (IPP) with 12.5 V clamping voltage under 10/1000 µs surge conditions, achieving 1500 W peak pulse power. Its temperature coefficient of breakdown voltage is +0.065%/°C, ensuring stable threshold behavior across temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 6.63 V - Maximum continuous reverse voltage before conduction begins; sets system operating margin. |
| VBR (Min Breakdown) | 7.38 V @ 10 mA - Ensures reliable avalanche initiation above normal operating voltage. |
| VC (Clamping Voltage) | 12.5 V @ 120 A - Limits downstream circuit voltage during surge, protecting ICs and sensors. |
| IPP (Peak Pulse Current) | 120 A - Sustains high-energy transients without failure under IEC 61000-4-5 Class 4 conditions. |
| PPP (Peak Pulse Power) | 1500 W - Enables robust protection against inductive switching spikes and induced RF surges. |
| Response Time | <100 ps - Faster than most semiconductor switches, preventing damage before protection activates. |
| TJ Range | –55°C to +175°C - Supports deployment in engine bays, avionics bays, and industrial control cabinets. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with cathode connected to case and marked by diode symbol. Tin-lead plated leads, weight ≈1.4 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to protected line or signal path; conducts only during forward bias (not used in TVS mode). |
| Cathode | Avalanche clamping terminal | Internally bonded to metal case; must be tied to system ground or reference plane for effective transient shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Protects DC-biased lines (e.g., power rails, sensor outputs) without interfering with normal forward operation. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and outgassing risks critical for aerospace and long-life military deployments. |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050-no derating required for TID up to 100 krad(Si). |
| IEC 61000-4-5 Class 4 support | Validated for secondary lightning surges with 2 Ω source impedance up to 1N5636A, covering 1N5631A's rating tier. |
| Sub-100 ps response | Clamps before transient energy couples into sensitive analog or digital circuitry, reducing layout sensitivity. |
Applications
| Aerospace Power Bus Protection | Avionics Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 28 V DC aircraft power distribution buses from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between bus and ground, activated only during overvoltage events. Use Value: Limits bus voltage to ≤12.5 V during 120 A transients, preventing latch-up or burnout in downstream regulators and controllers. |
Use Scenario: Shielding analog pressure/temperature sensor outputs in flight control units from EFT and RF-induced noise. IC Role / Device Role / Timing Role: Low-leakage (200 µA max) standoff guard on signal lines, clamping nanosecond-scale ESD bursts. Use Value: Maintains signal integrity below 6.63 V during normal operation while suppressing >15 kV ESD per IEC 61000-4-2. |
| Industrial Motor Drive Control | Military Vehicle Communication Lines |
Use Scenario: Safeguarding gate driver inputs and feedback paths in 48 V motor inverters exposed to commutation spikes. IC Role / Device Role / Timing Role: Fast-response transient limiter on isolated control signals, referenced to local ground plane. Use Value: Prevents false triggering of IGBT/MOSFET drivers by clamping 10/1000 µs surges within 100 ps, preserving timing accuracy. |
Use Scenario: Hardening MIL-STD-1553B data lines in armored vehicle electronics against EMP and lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated protector on bidirectional data lines (used with series impedance), leveraging DO-13 ruggedness. Use Value: Survives repeated 1500 W surges while maintaining <5 µA leakage at 6.63 V, ensuring protocol-level signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5631 | Non-A grade: wider VBR tolerance (6.12–7.48 V vs. 7.38–9.02 V for 1N5631A); no military qualification. | Limited to commercial-grade systems where tighter VBR control and radiation hardness are not required. | Select 1N5631 only for cost-sensitive, non-mission-critical applications with relaxed electrical tolerances. |
| SMBJ6.5A | Surface-mount SMB package; same 6.5 V VWM, but lower 600 W PPP and higher 13.4 V VC at 43.3 A IPP. | Used in space-constrained PCBs where through-hole mounting is impractical; not suitable for 1500 W surge demands. | Choose SMBJ6.5A only when board area is constrained and peak surge energy does not exceed 600 W. |
Compared with 1N5631 and SMBJ6.5A, the 1N5631A uniquely combines hermetic DO-13 reliability, 1500 W surge capacity, and military-grade VBR tolerance-making it irreplaceable in avionics and high-integrity industrial control where failure modes are unacceptable.
Availability
1N5631A is available at Aetrix Electronics and suitable for aerospace power bus protection, avionics sensor interface protection, and industrial motor drive control requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5631A 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with deep expertise in radiation-hardened and hermetically packaged components.
The 1N5631A belongs to Microchip's legacy TVS diode family engineered specifically for mission-critical transient suppression in environments where failure is not an option-emphasizing hermeticity, wide temperature operation, and IEC/military standard compliance.
FAQ
What is the standoff voltage (VWM) of the 1N5631A and why does it matter?
The 1N5631A has a rated standoff voltage (VWM) of 6.63 V, meaning it remains nonconductive below this reverse voltage. This value ensures compatibility with 5 V or 6 V DC systems while providing sufficient margin above nominal rail voltage to avoid leakage or premature conduction during normal operation-critical for maintaining signal integrity in avionics sensor interfaces and motor control feedback paths.
How does the 1N5631A achieve radiation hardness, and is test data available?
The 1N5631A achieves inherent radiation hardness due to its DO-13 hermetic metal-glass construction and silicon process design, validated per Microsemi MicroNote 050. No additional shielding or derating is required for total ionizing dose (TID) up to 100 krad(Si). Radiation test reports are available directly from Microchip upon request for qualified aerospace programs using the 1N5631A.
Can the 1N5631A be used for bidirectional transient suppression?
No-the 1N5631A is strictly unidirectional and must be installed with cathode to ground to protect positive-going transients on DC lines. For bidirectional protection (e.g., AC lines or differential data), Microchip offers the separate 1N6036–1N6072A series in the same DO-13 package; substituting the 1N5631A in such roles would leave negative transients unprotected and risk device failure.
What is the thermal resistance of the 1N5631A, and how does it affect PCB layout?
The 1N5631A has a junction-to-lead thermal resistance of 50°C/W when measured at 10 mm from the case, enabling efficient heat dissipation through its metal case to a grounded copper pour or chassis. For optimal thermal performance, PCB layout must provide ≥4 mm² of 1 oz copper pad connected to the cathode (case) terminal, minimizing thermal impedance and sustaining 1500 W surge capability without junction overheating.
Is the 1N5631A compliant with IEC 61000-4-5, and which test classes does it support?
Yes-the 1N5631A is validated for IEC 61000-4-5 secondary lightning protection. With 2 Ω source impedance, it supports Class 4 (up to 1N5636A); with 12 Ω, Class 1 (up to 1N5658A); and with 42 Ω, Class 1 (up to 1N5665A). Its 120 A IPP and 12.5 V VC ensure compliance across these configurations when applied per standard layout guidelines.
1N5631A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.02V
- Voltage - Breakdown (Min):
- 7.79V
- Voltage - Clamping (Max) @ Ipp:
- 12.1V
- Current - Peak Pulse (10/1000µs):
- 124A
- 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
1N5631A FAQ
1.How can I place an order for 1N5631A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5631A 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 1N5631A reliable?
The price and inventory of 1N5631A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5631A is usually 5 days.
3.What payment methods are accepted for 1N5631A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5631A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5631A?
1N5631A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5631A 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 1N5631A?
For technical support, including 1N5631A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5631A requirements.
6.How does Aetrix verify that 1N5631A is sourced from the original manufacturer or authorized distributors?
All 1N5631A 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 1N5631A meets industry standards.
7.What is the process for return or replacement of 1N5631A?
All 1N5631A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5631A, 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 1N5631A part is unused and in its original packaging.
Return procedure for 1N5631A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5631A Tags
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