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Microchip Technology 1N5651A
- Part No.:
- 1N5651A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5651A.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:5,470
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Product details
Overview
1N5651A from Microchip (formerly Microsemi) is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, rated for 1500 W peak pulse power at 10/1000 µs, with 50.4 V minimum breakdown voltage (VBR), 45.4 V rated standoff voltage (VWM), and 80.5 V maximum clamping voltage (VC) at 18.6 A peak pulse current - widely deployed in avionics power rail protection against IEC61000-4-5 Class 2 secondary lightning surges (12 Ω source impedance).
For engineers reviewing the 1N5651A datasheet, 1N5651A pinout, 1N5651A application, or 1N5651A equivalent, key selection criteria include its unidirectional polarity, hermetic DO-13 package, sub-100 ps response time, radiation-hardened construction per MicroNote 050, and compliance with MIL-PRF-19500/500 for JANTXV-grade variants.
Technical Context
The 1N5651A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 50.4–53.2 V VBR range at 1 mA test current, clamping transients to ≤80.5 V while sustaining 18.6 A peak pulse current. Its thermal resistance is 50 °C/W junction-to-lead (0.375″ from body), enabling robust surge handling in high-reliability environments.
Designed for through-hole mounting, it features cathode-connected-to-case polarity, tin-lead plating per MIL-STD-750, and inherent radiation hardness. It meets IEC61000-4-2 (ESD), -4-4 (EFT), and -4-5 (lightning) standards under defined source impedances - specifically Class 2 secondary lightning protection with 12 Ω source impedance per data sheet Table on Page 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Rated Standoff Voltage) | 45.4 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA; sets upper limit for protected circuit DC bias. |
| VBR (Breakdown Voltage) | 50.4–53.2 V @ 1 mA - precise avalanche onset threshold ensuring predictable clamping behavior under transient stress. |
| VC (Clamping Voltage) | 80.5 V @ 18.6 A - peak voltage seen by protected circuit during 10/1000 µs surge; defines worst-case overvoltage exposure. |
| PPP (Peak Pulse Power) | 1500 W @ 10/1000 µs - energy-handling capability sufficient for Class 2 IEC61000-4-5 surges with 12 Ω source impedance. |
| Response Time | <100 ps - enables effective suppression of ESD (IEC61000-4-2) and fast-rising switching transients before damage occurs. |
| Package | DO-13 (DO-202AA) - hermetically sealed metal-glass case with cathode connected to case; supports high-reliability, high-temp (-55°C to +175°C) operation. |
| Radiation Hardness | Inherently radiation hard per MicroNote 050 - qualified for avionics and space-adjacent applications without additional shielding or derating. |
Pinout & Package
Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with cathode electrically connected to the case and marked with diode symbol. Overall length: 1.000–1.625 inches; case diameter: 0.215–0.235 inches; lead diameter: 0.025–0.035 inches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current entry point during reverse-biased clamping | Connected internally to P-region; carries full surge current into avalanche junction when VREV > VBR. |
| Cathode (Lead 1 / Case) | Reference terminal and heat path | Electrically tied to metal case per MIL-PRF-19500; provides low-inductance return path and primary thermal conduction to PCB or chassis. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise DC rail protection without forward-conduction interference; ideal for positive-supply lines where reverse polarity is not expected. |
| 1500 W peak pulse rating | Supports repeated surge events up to IEC61000-4-5 Class 2 (12 Ω source) without degradation, verified at 0.01% duty cycle. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and outgassing risks; ensures long-term reliability in aerospace, military, and high-humidity industrial deployments. |
| MIL-PRF-19500/500 qualification | "A" suffix denotes tighter parametric tolerances and screening for JANTXV-grade use - required for flight-critical avionics subsystems. |
| Sub-100 ps response time | Clamps ESD events (±8 kV contact, ±15 kV air) before IC input structures experience irreversible damage, per IEC61000-4-2 Level 4. |
Applications
| Avionics Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 48 V DC bus inputs in airborne flight control computers exposed to induced RF and secondary lightning surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly across input terminals to shunt surge energy to chassis ground before reaching downstream DC/DC converters. Use Value: Maintains system uptime by preventing latch-up or gate oxide rupture in power management ICs during 12 Ω IEC61000-4-5 Class 2 surges up to 1 kV. |
Use Scenario: Input protection for PLC analog I/O modules interfacing with 24 V sensor loops in factory automation environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side signal/power lines subject to inductive kickback from solenoid valves and relay coils. Use Value: Limits transient voltage to ≤80.5 V, ensuring ADC front-end and isolation barrier components remain within absolute maximum ratings during 8.3 ms half-sine surges. |
| Military Vehicle Power Systems | Telecom Base Station DC Feeds |
Use Scenario: 28 V aircraft starter-generator output conditioning in ground support equipment subjected to MIL-STD-1275B transient profiles. IC Role / Device Role / Timing Role: First-line defense against load dump and alternator ripple-induced spikes on main power distribution rails. Use Value: Withstands 200 A forward surge (8.3 ms) and clamps 1500 W transients without parameter shift - critical for mission-critical vehicle electronics. |
Use Scenario: Surge protection on -48 V DC feed lines entering outdoor telecom cabinets exposed to nearby lightning strikes. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at cabinet entry point to divert IEC61000-4-5 Class 2 surges (12 Ω) before reaching rectifier and backup battery circuits. Use Value: Hermetic DO-13 construction prevents corrosion failure in coastal/humid deployments; radiation hardness avoids soft errors in remote sites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5651 | Same VWM/VBR/VC specs but wider VBR tolerance (50.4–61.6 V vs. 50.4–53.2 V); no "A"-grade screening. | Lacks MIL-PRF-19500/500 qualification; unsuitable for JANTXV-requiring avionics or defense programs. | Select 1N5651 only for commercial-grade cost-sensitive designs where tighter parametric control is unnecessary. |
| SMCJ48A | Surface-mount SMC package; 48 V VWM, 53.3 V VBR, 77.4 V VC @ 19.4 A; 1500 W rating same, but thermal resistance higher (junction-to-ambient ≈ 110 °C/W). | Not hermetically sealed; not radiation-hardened; incompatible with through-hole legacy layouts or high-reliability vacuum environments. | Choose SMCJ48A only for new SMT designs prioritizing board density over radiation tolerance or hermeticity. |
Compared with 1N5651 and SMCJ48A, the 1N5651A uniquely combines military-grade screening, hermetic sealing, and radiation hardness in a through-hole package - making it irreplaceable for flight-critical, high-temperature, or space-constrained avionics where long-term parametric stability is non-negotiable.
Availability
1N5651A is available at Aetrix Electronics and suitable for avionics power distribution, industrial motor drive control, and military vehicle power systems requiring stable component supply, long-lifecycle assurance, and traceable sourcing for safety-critical applications.
Supply support for 1N5651A 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 maintains its high-reliability analog and discrete product portfolio, including radiation-hardened and military-qualified components for aerospace, defense, and industrial markets.
The 1N5651A belongs to Microchip's legacy TVS diode family designed specifically for high-energy transient suppression in mission-critical systems - emphasizing hermetic packaging, MIL-spec screening, and IEC/EN compliance for harsh-environment deployment.
FAQ
What is the maximum clamping voltage of the 1N5651A under standard test conditions?
The 1N5651A has a maximum clamping voltage (VC) of 80.5 V when subjected to its rated peak pulse current of 18.6 A using the 10/1000 µs waveform. This value is measured at TA = 25°C and defines the highest voltage the protected circuit will experience during a standardized surge event. The 1N5651A maintains this clamping performance consistently due to its tightly controlled breakdown voltage range (50.4–53.2 V) and low dynamic impedance.
Is the 1N5651A suitable for IEC61000-4-5 Class 2 secondary lightning protection?
Yes, the 1N5651A is explicitly rated for IEC61000-4-5 Class 2 secondary lightning protection with a 12 Ω source impedance, as confirmed in the official datasheet (Page 2, "Secondary lightning protection per IEC61000-4-5 with 12 Ohms source impedance: Class 2: 1N5629 to 1N5651A"). Its 1500 W peak pulse power rating and 80.5 V clamping voltage ensure reliable suppression of 1 kV-level surges in telecom, avionics, and industrial power interfaces.
Does the 1N5651A have radiation hardness certification?
Yes, the 1N5651A is inherently radiation hard per Microsemi MicroNote 050, a documented qualification confirming performance stability under total ionizing dose (TID) exposure. This property is intrinsic to its DO-13 hermetic metal-glass construction and silicon process - no additional testing or screening is required to claim radiation tolerance, making the 1N5651A suitable for avionics and near-space applications.
What is the polarity configuration and marking convention for the 1N5651A?
The 1N5651A is a unidirectional TVS diode with cathode connected to the metal case (Lead 1), and anode as the isolated lead (Lead 2). Polarity is marked on the device body with a diode symbol indicating cathode direction, consistent with JEDEC DO-13 mechanical standards. This configuration requires the case to be tied to system ground or the lowest potential node in the protected circuit for proper clamping operation.
Can the 1N5651A replace the 1N5651 in a design requiring MIL-PRF-19500/500 compliance?
No - the 1N5651A is the MIL-qualified version with tighter parametric tolerances and full screening per MIL-PRF-19500/500, whereas the 1N5651 lacks this qualification. Using the 1N5651 in place of the 1N5651A violates military specification requirements for JANTXV-grade applications. The "A" suffix is mandatory for programs mandating MIL-PRF-19500/500, and the 1N5651A must be specified and sourced accordingly to maintain compliance.
1N5651A 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- 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
1N5651A FAQ
1.How can I place an order for 1N5651A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5651A 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 1N5651A reliable?
The price and inventory of 1N5651A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5651A is usually 5 days.
3.What payment methods are accepted for 1N5651A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5651A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5651A?
1N5651A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5651A 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 1N5651A?
For technical support, including 1N5651A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5651A requirements.
6.How does Aetrix verify that 1N5651A is sourced from the original manufacturer or authorized distributors?
All 1N5651A 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 1N5651A meets industry standards.
7.What is the process for return or replacement of 1N5651A?
All 1N5651A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5651A, 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 1N5651A part is unused and in its original packaging.
Return procedure for 1N5651A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5651A Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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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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Diodes Incorporated
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