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Microchip Technology 1N3611US/TR
- Part No.:
- 1N3611US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N3611US/TR.pdf
- Description:
- DIODE GEN PURP 200V 1A A SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,646
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Product details
Overview
1N3611US/TR 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; it features voidless hermetic glass sealing with Category I metallurgical bond and is used in high-reliability power supply rectification and catch-diode applications.
For engineers reviewing the 1N3611US/TR datasheet, 1N3611US/TR pinout, 1N3611US/TR application, or 1N3611US/TR equivalent, key selection criteria include its MIL-PRF-19500/228 qualification, -65°C to +175°C operating temperature range, 38°C/W thermal resistance, cathode-band polarity marking, and surface-mount MELF-compatible "US" suffix configuration.
Technical Context
This device belongs to Microsemi's legacy 1N3611–1N3614 series of standard-recovery rectifiers, designed for robustness in harsh environments. It uses a tungsten-slug–based hermetic glass package with Sn/Pb-plated copper axial leads and exhibits controlled avalanche capability up to 300 W peak reverse power.
Its electrical behavior is defined by a 1.1 V maximum forward voltage at 1 A pulsed, ≤1.0 μA reverse leakage at VRWM, and linear derating of forward current from 1.0 A at 100°C to 0.30 A at 150°C - all specified at 30°C case temperature per MIL-PRF-19500/228 test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 200 V - maximum continuous reverse voltage sustainable across cathode-anode without breakdown |
| Average Rectified Forward Current (IO) | 1.0 A @ TA = 100°C - usable DC output current in bridge/half-bridge rectifiers with adequate heatsinking |
| Forward Voltage (VF) | 1.1 V @ 1 A pulsed - conduction loss contributor in low-frequency switching and linear power supplies |
| Non-Repetitive Surge Current (IFSM) | 30 A @ 8.3 ms half-sine - withstands inrush and fault transients in industrial AC-DC front-ends |
| Junction Temperature Range | -65°C to +175°C - enables operation in aerospace, downhole, and military vehicle electronics |
| Thermal Resistance (RθJL) | 38°C/W junction-to-lead - determines required lead length (≥10 mm) for thermal management in PCB mounting |
Pinout & Package
Package: Axial-lead, voidless hermetically sealed hard glass case with tungsten slugs; cathode identified by painted band; Sn/Pb-plated copper leads; weight ≈ 500 mg; compliant with EIA-296 tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Positive input terminal during forward conduction | Connected to AC source or switch-node in flyback/flywheel configurations |
| Cathode (banded end) | Negative output terminal during forward conduction | Connected to load return or smoothing capacitor negative rail |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over decades in sealed enclosures |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability under MIL-STD-883 conditions |
| Controlled avalanche capability | Supports safe clamping of inductive kickback without catastrophic failure |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID), per MicroNote 050, for space-qualified systems |
| MIL-PRF-19500/228 qualification | Validates screening, testing, and traceability for defense and avionics procurement |
Applications
| Avionics Power Supply | Military Vehicle DC-DC Converter |
|---|---|
Use Scenario: Rectifying 400 Hz aircraft generator output into regulated 28 V DC bus. IC Role / Device Role / Timing Role: Primary input rectifier in full-wave bridge configuration. Use Value: Withstands wide ambient temperature swings (-65°C to +175°C) and meets DO-160 environmental stress requirements. | Use Scenario: Catch diode in 24 V diesel-generator-fed DC-DC converter for command-and-control subsystems. IC Role / Device Role / Timing Role: Freewheeling path for inductive energy recovery during MOSFET turn-off. Use Value: 30 A surge rating handles engine cranking transients; hermetic seal prevents field corrosion in humid, salt-laden environments. |
| Downhole Oilfield Instrumentation | Tactical Radio Power Front-End |
Use Scenario: Input rectification in high-temperature logging tool power supply operating at 150°C ambient. IC Role / Device Role / Timing Role: High-temp-rated rectifier in isolated AC-DC stage feeding DC/DC modules. Use Value: Maintains 0.30 A average forward current at 150°C and survives thermal shock during rapid wellhead deployment. | Use Scenario: Half-wave rectifier in battery-charger interface for manpack radios with 115 VAC input. IC Role / Device Role / Timing Role: Input-stage rectifier with surge immunity against lightning-induced line spikes. Use Value: 300 μA max reverse leakage at 200 V ensures minimal standby drain; MIL-qualified traceability satisfies NSA Type 1 encryption platform requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3611US | No TR suffix; bulk packaging instead of tape-and-reel; identical electrical and mechanical specs | Suitable for manual assembly or low-volume prototyping where reel handling is unnecessary | Select 1N3611US/TR when automated SMT placement or consistent reel-based logistics are required |
| 1N5614US | MELF surface-mount package; same 200 V VRWM and 1 A IO rating but different thermal profile and mounting method | Used in compact, high-density PCB layouts where axial leads are incompatible with layout constraints | Choose 1N5614US only if board space and reflow compatibility outweigh axial-lead serviceability and MIL-PRF-19500/228 traceability needs |
Compared with 1N3611US/TR, the 1N3611US lacks tape-and-reel packaging but offers identical performance, while the 1N5614US trades axial-leaded ruggedness and military qualification for MELF footprint efficiency - making the former ideal for high-reliability through-hole production and the latter for space-constrained commercial designs.
Availability
1N3611US/TR is available at Aetrix Electronics and suitable for avionics power supplies, military vehicle DC-DC converters, and downhole instrumentation requiring stable component supply with full MIL-PRF-19500/228 compliance and long-term obsolescence management.
Supply support for 1N3611US/TR 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, discrete devices, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N3611US/TR belongs to Microsemi's legacy military rectifier product line, engineered specifically for mission-critical power conversion where hermetic sealing, extreme temperature operation, and MIL-qualified screening are mandatory.
FAQ
What is the maximum junction temperature rating for the 1N3611US/TR?
The 1N3611US/TR has a maximum junction temperature rating of +175°C and a minimum of -65°C, enabling operation in extreme environments such as jet engine bays or deep-well sensors. This rating is validated per MIL-PRF-19500/228 and supported by its 38°C/W junction-to-lead thermal resistance. The 1N3611US/TR maintains functional integrity across this full range when mounted with ≥10 mm lead length from body.
Does the 1N3611US/TR meet MIL-PRF-19500/228 requirements?
Yes, the 1N3611US/TR is explicitly qualified to MIL-PRF-19500/228 as a Level JANTX device, including screening for vibration, thermal shock, and hermeticity. Its voidless glass construction, Category I metallurgical bond, and traceable lot documentation satisfy all mandatory tests in the specification. The 1N3611US/TR datasheet T4-LDS-0190 Rev. 1 confirms this qualification status.
What does the "US" suffix indicate in 1N3611US/TR?
The "US" suffix denotes Microsemi's surface-mount-compatible version of the 1N3611 family, packaged in a square-end MELF configuration - though the 1N3611US/TR itself remains an axial-lead device with tape-and-reel packaging. The "TR" indicates tape-and-reel format per EIA-296, not MELF. The 1N3611US/TR retains the same electrical specs and MIL qualification as the through-hole JAN1N3611 but adds automated assembly readiness.
How is polarity marked on the 1N3611US/TR?
The 1N3611US/TR uses a painted cathode band on the glass body to identify the cathode terminal, consistent with JEDEC standard marking for axial diodes. The unmarked end is the anode. This marking is visible after soldering and remains legible throughout the device's operational life due to the hermetic glass encapsulation. Polarity verification is critical before installation in bridge or flyback circuits to prevent reverse-bias overstress of the 1N3611US/TR.
What is the forward voltage drop of the 1N3611US/TR at rated current?
The 1N3611US/TR exhibits a maximum forward voltage drop of 1.1 V at 1 A pulsed forward current, measured at 30°C case temperature. This value reflects conduction loss under typical rectifier duty cycles and directly impacts power supply efficiency and thermal design. At higher temperatures or DC conditions, VF increases slightly, but the 1N3611US/TR remains within spec up to 175°C junction temperature.
1N3611US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N3611US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3611US/TR 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/TR reliable?
The price and inventory of 1N3611US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3611US/TR is usually 5 days.
3.What payment methods are accepted for 1N3611US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3611US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3611US/TR?
1N3611US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3611US/TR 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/TR?
For technical support, including 1N3611US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3611US/TR requirements.
6.How does Aetrix verify that 1N3611US/TR is sourced from the original manufacturer or authorized distributors?
All 1N3611US/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N3611US/TR?
All 1N3611US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3611US/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N3611US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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