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Microchip Technology 1N648UR-1/TR
- Part No.:
- 1N648UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- -
- Datasheet:
-
1N648UR-1/TR.pdf
- Description:
- SIGNAL OR COMPUTER DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:3,357
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Product details
Overview
1N648UR-1/TR from Microsemi is a hermetically sealed silicon rectifier diode in a glass package, rated for 500V DC reverse voltage, 400mA forward current at +25°C, and 5A surge current (8.3ms sine), used in high-reliability power conversion stages of aerospace and industrial power supplies.
For engineers reviewing the 1N648UR-1/TR datasheet, 1N648UR-1/TR pinout, 1N648UR-1/TR application, or 1N648UR-1/TR equivalent, key selection criteria include its 500V VRWM rating, 1.0V max VF at 400mA, 0.05µA max IR at 500V, -65°C to +175°C operating range, and hermetic glass package suitability for harsh-environment rectification.
Technical Context
This axial-lead, polarity-marked (banded cathode) rectifier employs metallurgically bonded construction inside a hermetically sealed glass case, enabling stable operation across extreme temperature excursions without moisture ingress or parameter drift.
Its electrical behavior is defined by a maximum forward voltage drop of 1.0V at 400mA and leakage current limited to 0.05µA at rated 500V reverse bias, with capacitance ≤20pF at 4V reverse bias - characteristics critical for EMI-sensitive and high-temperature switching power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 500V DC - maximum continuous reverse voltage before breakdown; defines safe blocking capability in AC/DC front-end stages |
| IF(AV) | 400mA at +25°C - average forward current handling under standard ambient; derates linearly above +25°C |
| VF(max) | 1.00V at 400mA - peak forward conduction loss impacting efficiency and thermal design in low-voltage rectifiers |
| IR(max) | 0.05µA at 500V, +25°C - ultra-low leakage ensures minimal standby power loss and stable bias in precision circuits |
| Surge Current | 5.0A (8.3ms sine) - withstands transient inrush during cold-start or line surges without failure |
| Operating Temp | -65°C to +175°C - supports deployment in avionics, downhole tools, and military-grade power systems |
Pinout & Package
Hermetically sealed glass package with axial leads; cathode identified by blue body coating and black digit marking, plus a visible band on the cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC input or transformer secondary; must handle full surge and steady-state current |
| Cathode | Forward current exit / reverse voltage reference | Banded end; connects to output filter capacitor or load return; defines polarity-sensitive mounting |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture-induced parameter shift and long-term degradation in humid or corrosive environments |
| Metallurgical bonding | Ensures robust die-to-lead attachment for high thermal cycling reliability and low contact resistance |
| Double plug construction | Enhances mechanical integrity and hermeticity over single-seal alternatives in high-shock applications |
| Cathode band marking | Enables unambiguous polarity identification during manual assembly and automated optical inspection (AOI) |
Applications
| Avionics Power Supply | Downhole Instrumentation |
|---|---|
Use Scenario: Rectifying 115VAC 400Hz aircraft bus in DC-DC converter front-end. IC Role / Device Role / Timing Role: Primary AC-to-DC rectifier in high-reliability, thermally constrained power module. Use Value: 175°C max operating temperature and hermetic seal prevent failure during extended flight cycles and thermal soak. | Use Scenario: Converting AC signal from geophysical sensors in oil/gas well logging tools. IC Role / Device Role / Timing Role: Signal-level rectifier in high-temperature analog front-end conditioning circuitry. Use Value: 0.05µA max IR ensures negligible loading on microamp-level sensor outputs at 150°C ambient. |
| Military Vehicle Power | Industrial Motor Control |
Use Scenario: Input rectification in 28V DC power distribution units exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Bulk rectifier in MIL-STD-1275-compliant power interface. Use Value: -65°C start-up capability and 5A surge rating support cold-engine cranking and load dump transients. | Use Scenario: Snubber and auxiliary supply rectification in VFD gate driver power rails. IC Role / Device Role / Timing Role: Low-leakage, high-VRWM rectifier for isolated auxiliary DC generation. Use Value: 20pF max junction capacitance minimizes high-frequency coupling into sensitive gate drive signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N648UR-1 | No TR suffix; bulk packaging vs. tape-and-reel; identical electrical specs and package | Same use cases; differs only in packaging format for SMT placement vs. manual/hand-soldering | Select 1N648UR-1/TR when automated assembly requires reel-fed feeders |
| 1N648-1 | Non-hermetic epoxy package; wider VF tolerance (0.8–1.2V); higher IR (≤1.0µA) | Suitable for commercial-grade applications where cost outweighs hermeticity and leakage requirements | Choose 1N648-1 only if environmental stress testing and ultra-low leakage are not required |
Compared with 1N648UR-1/TR, the 1N648UR-1 offers identical performance in a different packaging format, while the 1N648-1 trades hermeticity and leakage performance for lower cost in non-critical environments.
Availability
1N648UR-1/TR is available at Aetrix Electronics and suitable for avionics power supplies, downhole instrumentation, and military vehicle power systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N648UR-1/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 (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N648UR-1/TR belongs to Microsemi's legacy hermetic rectifier family, engineered specifically for mission-critical power conversion where parameter stability under thermal and environmental stress is non-negotiable.
FAQ
What is the maximum reverse voltage rating for the 1N648UR-1/TR?
The 1N648UR-1/TR has a DC reverse voltage rating (VRWM) of 500V. This value represents the highest continuous reverse-bias voltage the device can block without entering breakdown. It is specified at 25°C and remains valid across the full -65°C to +175°C operating temperature range, making the 1N648UR-1/TR suitable for high-voltage rectification in demanding environments.
What is the forward voltage drop of the 1N648UR-1/TR at rated current?
The 1N648UR-1/TR exhibits a maximum forward voltage drop (VF) of 1.00V at 400mA forward current and +25°C ambient. At 600mA, VF is not guaranteed but measured up to 50V - confirming robust conduction capability. This low VF supports efficient power conversion and reduced thermal load in compact rectifier designs using the 1N648UR-1/TR.
Does the 1N648UR-1/TR have a hermetic package?
Yes, the 1N648UR-1/TR uses a hermetically sealed glass package, confirmed by manufacturer documentation and construction details including metallurgical bonding and double-plug sealing. This hermeticity prevents moisture ingress and ensures long-term parameter stability - a defining feature distinguishing the 1N648UR-1/TR from epoxy-packaged variants like the 1N648-1.
What is the leakage current specification for the 1N648UR-1/TR?
The 1N648UR-1/TR specifies a maximum reverse leakage current (IR) of 0.05µA at 500V DC reverse voltage and +25°C. This ultra-low leakage enables reliable operation in high-impedance circuits and high-temperature applications where even nanoamp-level currents could disrupt biasing or sensing - a key performance advantage of the 1N648UR-1/TR in precision power systems.
What temperature range is supported by the 1N648UR-1/TR?
The 1N648UR-1/TR operates continuously from -65°C to +175°C, with storage temperature matching this range. Its metallurgically bonded, hermetically sealed glass construction enables this wide range without parameter drift or seal failure. This makes the 1N648UR-1/TR appropriate for extreme environments such as jet engine bays, oil well downhole tools, and space-qualified electronics.
1N648UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- -
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- -
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
1N648UR-1/TR FAQ
1.How can I place an order for 1N648UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N648UR-1/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 1N648UR-1/TR reliable?
The price and inventory of 1N648UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N648UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N648UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N648UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N648UR-1/TR?
1N648UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N648UR-1/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 1N648UR-1/TR?
For technical support, including 1N648UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N648UR-1/TR requirements.
6.How does Aetrix verify that 1N648UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N648UR-1/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 1N648UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N648UR-1/TR?
All 1N648UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N648UR-1/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 1N648UR-1/TR part is unused and in its original packaging.
Return procedure for 1N648UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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