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Microchip Technology 1N3650
- Part No.:
- 1N3650
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N3650.pdf
- Description:
- DIODE GEN PURP DO203AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,917
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Product details
Overview
1N3650 from Microsemi is a high-reliability glass-passivated power rectifier diode rated for 1000 V peak repetitive reverse voltage (VRWM), 3.3 A average forward current (IF), and 25 A non-repetitive surge current (IFSM), used in military-grade DC power supplies and high-voltage industrial rectification circuits.
For engineers reviewing the 1N3650 datasheet, 1N3650 pinout, 1N3650 application, or 1N3650 equivalent, key selection criteria include its MIL-PRF-19500/260 qualification, DO-203AA (DO-4) stud-mount package, 2.0 °C/W thermal resistance, 150 °C maximum case temperature, and low 5 µA reverse leakage at 1000 V and 25 °C.
Technical Context
This device operates as a single-junction, silicon planar power rectifier with glass-to-metal seal construction and glass-passivated die-enabling stable performance under high-voltage transients and extreme thermal cycling. Its design supports continuous conduction mode in high-voltage AC/DC conversion stages where reliability exceeds commercial-grade requirements.
The 1N3650 is specified across two temperature conditions: reverse leakage is limited to 5 µA at 1000 V and 25 °C, and rises to 200 µA at 1000 V and 150 °C-demonstrating controlled thermal drift consistent with MIL-qualified high-reliability rectifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 1000 V - Maximum repetitive reverse blocking voltage before breakdown; defines usable input voltage range in high-voltage rectifier designs. |
| IF (avg) | 3.3 A at TC = 150 °C - Continuous forward current capability when mounted on heatsink maintaining 150 °C case temperature. |
| IFSM | 25 A @ 8.3 ms half-sine - Surge rating for line-start transients or capacitor-charging inrush without failure. |
| RθJC | 2.0 °C/W - Thermal resistance from junction to case; enables precise heatsink sizing for thermal management in sealed enclosures. |
| VF | 2.2 V @ IF = 10 A, Tj = 25 °C - Forward voltage drop determines conduction loss and thermal load during steady-state operation. |
| IR | 5 µA @ VR = 1000 V, Tj = 25 °C - Low reverse leakage ensures minimal standby power loss and stable voltage hold-off in high-impedance circuits. |
Pinout & Package
Package: DO-203AA (DO-4), stud-mounted, glass-to-metal sealed metal case with threaded anode terminal and cathode stud. Anode is electrically connected to the metal case; cathode is isolated via insulated mounting stud.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Case) | Forward current entry point | Electrically connected to metal case; requires insulating washer if mounting to grounded heatsink. |
| Cathode (Stud) | Forward current exit point | Isolated threaded stud; provides mechanical mounting and electrical connection to output rail. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/260 qualification | Meets military screening, testing, and traceability requirements for aerospace and defense power systems. |
| Glass-passivated die | Eliminates surface contamination sensitivity and improves long-term stability under humidity and thermal stress. |
| Glass-to-metal seal construction | Provides hermetic sealing against moisture and contaminants, enabling operation in harsh environmental conditions. |
| 150 °C maximum case temperature | Supports use in high-ambient environments such as engine bays or enclosed industrial cabinets without derating. |
Applications
| High-Voltage DC Power Supply | Military Radar Transmitter Modulator |
|---|---|
Use Scenario: Rectifying 700–1000 VAC transformer secondaries into regulated DC bus for radar pulse modulators. IC Role / Device Role / Timing Role: High-voltage power rectifier providing unidirectional current flow with low leakage and high surge tolerance. Use Value: Enables reliable operation under repeated high-voltage switching transients and thermal cycling per MIL-STD-810. | Use Scenario: Converting pulsed high-voltage AC into charged storage capacitors for magnetron or klystron drive circuits. IC Role / Device Role / Timing Role: Primary rectifier in high-energy capacitor charging stage, handling 25 A surge pulses at 1000 V reverse bias. Use Value: Maintains <5 µA leakage at full rated voltage and 25 °C, preserving charge retention between radar pulses. |
| Industrial HV Motor Drive Snubber | Aerospace Avionics Power Converter |
Use Scenario: Clamping inductive kickback in high-voltage IGBT snubber networks operating up to 1000 V. IC Role / Device Role / Timing Role: Fast-recovery-capable rectifier absorbing transient energy during switching transitions. Use Value: 2.0 °C/W RθJC allows direct thermal coupling to chassis, minimizing localized hot spots in compact snubber assemblies. | Use Scenario: Input-stage rectification in airborne 270 VDC-to-28 VDC converters requiring extended lifetime and radiation-tolerant packaging. IC Role / Device Role / Timing Role: Hermetically sealed, glass-passivated rectifier ensuring long-term reliability in vibration-prone, low-pressure environments. Use Value: Glass-to-metal seal and MIL qualification ensure zero moisture ingress and no parametric drift over 20,000 flight hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage power rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3650R | Reversed polarity: anode and cathode terminals swapped versus 1N3650; marked with "R" suffix. | Required where circuit topology demands cathode-to-case configuration instead of anode-to-case. | Select 1N3650R only when schematic layout mandates reversed terminal orientation; otherwise, 1N3650 is standard. |
| 1N1128RA | Same VRWM (1000 V), same package, but qualified to JAN level with additional screening and lot traceability. | Used in mission-critical avionics where full JAN certification and extended test data are mandated. | Choose 1N1128RA for programs requiring JAN documentation and enhanced reliability reporting; 1N3650 meets standard MIL-PRF-19500/260. |
Compared with 1N3650R and 1N1128RA, the 1N3650 offers standard MIL-PRF-19500/260 compliance with optimized cost and lead time, while retaining identical electrical specs and DO-203AA mechanical form-making it ideal for high-volume defense subsystems where full JAN certification is not required.
Availability
1N3650 is available at Aetrix Electronics and suitable for high-voltage DC power supplies, radar transmitter modulators, and industrial motor drive snubbers requiring stable component supply and long-term obsolescence management.
Supply support for 1N3650 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N3650 belongs to Microsemi's MIL-qualified high-voltage rectifier product line, designed specifically for ruggedized power conversion in environments demanding hermetic sealing, surge resilience, and extended temperature operation.
FAQ
What is the maximum case temperature rating for the 1N3650?
The 1N3650 is rated for a maximum operating case temperature (TC) of +150 °C. This specification is defined under absolute maximum ratings and applies when the device is mounted to a heatsink capable of maintaining that temperature at the case interface. Exceeding this limit risks irreversible degradation of the glass-passivated junction and seal integrity.
Does the 1N3650 have a specified forward voltage drop?
Yes, the 1N3650 has a typical forward voltage drop (VF) of 2.2 V at IF = 10 A and junction temperature of 25 °C. This value is measured under pulsed conditions (300 µs pulse width, 2% duty cycle) and serves as the baseline for calculating conduction losses in power supply designs.
Is the 1N3650 compatible with DO-203AA (DO-4) footprint layouts?
Yes, the 1N3650 uses the DO-203AA (formerly DO-4) package with standardized dimensions including a 0.424–0.437 inch height and 0.163–0.189 inch unthreaded stud diameter. Its mechanical outline matches the MIL-STD-1835B DO-203AA specification, ensuring compatibility with existing DO-4 mounting hardware and PCB cutouts.
How does reverse leakage of the 1N3650 change at elevated temperature?
At 1000 V reverse bias, the 1N3650 exhibits 5 µA maximum reverse current (IR) at 25 °C, rising to 200 µA at 150 °C. This 40× increase reflects intrinsic silicon behavior and must be accounted for in high-temperature hold-off circuits where leakage-induced power dissipation could affect system efficiency or thermal balance.
What does the "R" suffix mean in related part numbers like 1N3650R?
The "R" suffix in 1N3650R indicates reversed polarity: the anode and cathode terminals are swapped relative to the standard 1N3650. In 1N3650R, the metal case becomes the cathode and the stud becomes the anode-requiring schematic and layout revision to maintain correct circuit functionality.
1N3650 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-203AA, DO-4, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 3.3A
- Voltage - Forward (Vf) (Max) @ If:
- 2.2 V @ 10 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Stud Mount
- Supplier Device Package:
- DO-203AA (DO-4)
- Operating Temperature - Junction:
- -
1N3650 FAQ
1.How can I place an order for 1N3650 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3650 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 1N3650 reliable?
The price and inventory of 1N3650 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3650 is usually 5 days.
3.What payment methods are accepted for 1N3650?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3650 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3650?
1N3650 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3650 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 1N3650?
For technical support, including 1N3650 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3650 requirements.
6.How does Aetrix verify that 1N3650 is sourced from the original manufacturer or authorized distributors?
All 1N3650 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 1N3650 meets industry standards.
7.What is the process for return or replacement of 1N3650?
All 1N3650 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3650, 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 1N3650 part is unused and in its original packaging.
Return procedure for 1N3650:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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