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Microchip Technology 1N3611US
- Part No.:
- 1N3611US
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N3611US.pdf
- Description:
- DIODE GEN PURP 200V 1A A SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,330
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Product details
Overview
1N3611US from Microsemi is a military-qualified standard-recovery axial-lead glass rectifier diode rated for 200 V working peak reverse voltage, 1.0 A average forward current at 100°C, and 30 A non-repetitive surge current, used in high-reliability power conversion circuits such as bridge rectifiers and catch diodes in aerospace power supplies.
For engineers reviewing the 1N3611US datasheet, 1N3611US pinout, 1N3611US application, or 1N3611US equivalent, key selection criteria include its voidless hermetic glass package, Category I metallurgical bond, -65°C to +175°C operating temperature range, and compliance with MIL-PRF-19500/228 Level JAN/JANTX.
Technical Context
This diode operates as a unidirectional current-conducting device with controlled avalanche capability and low thermal resistance (38°C/W junction-to-lead). Its standard recovery time supports line-frequency rectification rather than high-frequency switching.
The 1N3611US uses tungsten slugs within a hard glass envelope and features tin/lead-plated copper axial leads with cathode band polarity marking. It is rated for 260°C soldering at 10 s and meets EIA-296 tape-and-reel packaging standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 200 V - Maximum continuous reverse voltage the device sustains across its terminals without breakdown under specified temperature conditions. |
| VBR @ 100 μA | 240 V min - Minimum voltage at which the diode enters controlled avalanche, enabling robust overvoltage protection capability. |
| IO @ 100°C | 1.0 A - Average forward current the device delivers continuously when ambient temperature is 100°C, derating linearly above that point. |
| VF @ 1 A (pulsed) | 1.1 V max - Forward voltage drop during conduction, directly impacting conduction loss and thermal design in rectifier stages. |
| IR @ VRWM | 300 μA max - Reverse leakage current at rated reverse voltage, critical for low-power standby and high-impedance sensing circuits. |
| IFSM @ 8.3 ms | 30 A - Non-repetitive surge current handling capacity, supporting inrush current tolerance in AC/DC front-end designs. |
| Junction Temp Range | -65°C to +175°C - Operating temperature envelope enabling deployment in extreme environments including space and avionics. |
Pinout & Package
Package: Axial-lead, voidless hermetically sealed hard glass case with tungsten slugs; cathode identified by painted band; lead finish: Sn/Pb; weight ≈ 500 mg; compliant with EIA-296 tape-and-reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to AC input or transformer secondary in half-wave or full-wave rectifier configurations. |
| Cathode | Forward current exit terminal | Marked with painted band; connects to output capacitor or load return path in DC bus generation. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and contaminants, ensuring long-term reliability in vacuum, radiation, and high-humidity environments. |
| Category I metallurgical bond | Provides mechanical and thermal integrity between semiconductor die and internal slug structure, preventing bond lift under thermal cycling stress. |
| Controlled avalanche capability | Enables safe clamping of transient overvoltages up to peak reverse power limits without catastrophic failure. |
| Radiation hardness | Inherently resistant to total ionizing dose (TID) effects per MicroNote 050, suitable for space-grade applications without shielding. |
| Low thermal resistance (38°C/W) | Reduces junction temperature rise under load, extending lifetime and improving power density in compact power supplies. |
Applications
| Aerospace Power Supplies | Military Radar Transmitters |
|---|---|
Use Scenario: Rectifying 400 Hz aircraft generator output into stable DC bus for avionics subsystems. IC Role / Device Role / Timing Role: Standard-recovery rectifier diode performing half-wave or full-wave AC-to-DC conversion. Use Value: Hermetic seal and -65°C to +175°C rating ensure uninterrupted operation during rapid cabin pressure and temperature transients. | Use Scenario: Catch diode in pulsed modulator circuits protecting switching transistors from inductive kickback. IC Role / Device Role / Timing Role: Freewheeling diode absorbing stored energy during transistor turn-off in high-voltage pulse generators. Use Value: 30 A surge rating and controlled avalanche behavior prevent destructive voltage spikes during repetitive pulse operation. |
| Undersea Communication Systems | Satellite Power Management Units |
Use Scenario: Input rectification stage in isolated DC/DC converters powering deep-sea sensor arrays. IC Role / Device Role / Timing Role: Primary rectifier converting AC from isolation transformers into regulated DC supply rails. Use Value: Voidless glass construction prevents moisture ingress and corrosion in high-pressure saline environments over decades of service. | Use Scenario: Output rectification in redundant solar array regulators feeding battery charge controllers. IC Role / Device Role / Timing Role: High-reliability rectifier maintaining DC bus integrity during eclipse periods and radiation events. Use Value: Inherent radiation hardness and MIL-PRF-19500 qualification eliminate need for additional shielding or derating in LEO orbit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3611 | Same electrical specs but through-hole axial lead without US suffix; not surface-mount compatible. | Requires manual insertion and wave soldering; unsuitable for automated SMT lines. | Select 1N3611US when board assembly uses reflow processes and space-constrained layouts demand MELF-compatible footprint. |
| 1N5614US | Higher VRWM (200 V vs. 200 V same), identical IO and VF, but rated per MIL-PRF-19500/286 JANS level with enhanced screening. | Approved for JANS-level space applications; includes additional burn-in and lot acceptance testing. | Choose 1N5614US only when mission-critical programs require JANS certification beyond JAN/JANTX requirements. |
Compared with 1N3611 and 1N5614US, the 1N3611US provides surface-mount compatibility while retaining JAN/JANTX qualification and MIL-PRF-19500/228 compliance-making it optimal for high-reliability SMT production where JANS-level screening is unnecessary.
Availability
1N3611US is available at Aetrix Electronics and suitable for aerospace power supplies, military radar transmitters, and undersea communication systems requiring stable component supply with full traceability and long-term obsolescence management.
Supply support for 1N3611US 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 ICs, discrete devices, and RF solutions for defense, aerospace, and industrial markets.
The 1N3611US belongs to Microsemi's military-qualified standard-recovery rectifier family designed specifically for mission-critical power conversion where hermetic sealing, radiation tolerance, and extended temperature operation are mandatory.
FAQ
What is the maximum working peak reverse voltage for the 1N3611US?
The 1N3611US has a working peak reverse voltage (VRWM) of 200 V. This value represents the highest continuous reverse-bias voltage the device can withstand across its terminals while remaining within safe operating limits over its full temperature range. Exceeding this voltage risks premature breakdown or irreversible damage to the junction.
Does the 1N3611US meet military specifications?
Yes, the 1N3611US is qualified per MIL-PRF-19500/228 at JAN and JANTX levels. It undergoes rigorous environmental, electrical, and mechanical testing-including thermal cycling, vibration, and hermeticity verification-to ensure performance in defense and aerospace applications where failure is unacceptable.
What is the forward voltage drop of the 1N3611US at rated current?
The 1N3611US exhibits a maximum forward voltage (VF) of 1.1 V when conducting 1 A in pulsed mode at 25°C. This parameter directly affects conduction losses and thermal design; actual VF increases slightly at elevated junction temperatures and under DC conditions due to thermal self-heating.
Is the 1N3611US suitable for surface-mount assembly?
Yes, the 1N3611US uses a square end-cap MELF-style surface-mount package, distinct from the through-hole 1N3611. It complies with EIA-296 tape-and-reel standards and is compatible with standard reflow soldering profiles, including peak temperatures up to 260°C for 10 seconds.
What does "voidless hermetic seal" mean for the 1N3611US?
A voidless hermetic seal means the 1N3611US glass envelope contains no internal air pockets or trapped gases, eliminating pathways for moisture ingress or chemical corrosion. This construction ensures long-term parametric stability and reliability in harsh environments such as space, underwater, or high-humidity military enclosures.
1N3611US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- A, SQ-MELF
- Operating Temperature - Junction:
- -65°C ~ 175°C
1N3611US FAQ
1.How can I place an order for 1N3611US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3611US 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 1N3611US reliable?
The price and inventory of 1N3611US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3611US is usually 5 days.
3.What payment methods are accepted for 1N3611US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3611US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3611US?
1N3611US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3611US 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 1N3611US?
For technical support, including 1N3611US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3611US requirements.
6.How does Aetrix verify that 1N3611US is sourced from the original manufacturer or authorized distributors?
All 1N3611US 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 1N3611US meets industry standards.
7.What is the process for return or replacement of 1N3611US?
All 1N3611US units undergo pre-shipment inspection (PSI). If there is an issue with 1N3611US, 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 1N3611US part is unused and in its original packaging.
Return procedure for 1N3611US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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