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Microchip Technology 1N5194UR/TR
- Part No.:
- 1N5194UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5194UR/TR.pdf
- Description:
- SIGNAL OR COMPUTER DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:85
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Product details
Overview
1N5194UR/TR from Microsemi is a hermetically sealed, metallurgically bonded switching diode in DO-213AA glass package, rated for 70 V reverse voltage, 200 mA average forward current, and 500 mW power dissipation at 25°C, with 0.8–1.0 V forward voltage at 100 mA - used in high-reliability military power supply clamping and transient suppression circuits.
For engineers reviewing the 1N5194UR/TR datasheet, 1N5194UR/TR pinout, 1N5194UR/TR application, or 1N5194UR/TR equivalent, key selection criteria include MIL-PRF-19500/118 qualification level (JANTXV), -65°C to +175°C operating range, 2 A surge current capability, thermal impedance ≤70°C/W, and cathode band polarity marking.
Technical Context
This diode employs double-plug construction and metallurgical bonding for enhanced thermal stability and low parasitic inductance, enabling fast recovery in high-frequency switching applications. Its hermetic glass package ensures long-term reliability under extreme temperature cycling and humidity exposure.
Rated per MIL-PRF-19500/118, the 1N5194UR/TR supports operation up to 175°C junction temperature with 0.025 µA max reverse leakage at 70 V and 25°C - critical for low-power standby circuits in aerospace avionics and downhole oilfield electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VRWM) | 70 V - maximum DC blocking voltage before significant leakage or breakdown |
| Avg Forward Current (IF(AV)) | 200 mA - continuous DC current handling capability at 25°C ambient |
| Peak Surge Current (IFSM) | 2 A - single half-sine 8.3 ms pulse rating for transient overload resilience |
| Forward Voltage (VF) | 0.8–1.0 V at 100 mA - low conduction loss enabling efficient rectification in low-voltage rails |
| Reverse Leakage (IR) | ≤0.025 µA at 70 V, 25°C - ultra-low leakage preserving battery life in always-on sensing nodes |
| Thermal Impedance (ZθJX) | ≤70°C/W - enables direct mounting on PCB without heatsink for moderate power dissipation |
| Operating Temp Range | -65°C to +175°C - qualified for engine bay, turbine, and space-grade environments |
Pinout & Package
Hermetically sealed glass DO-213AA package (1.60–1.70 mm diameter, 3.30–3.70 mm length); cathode identified by axial band; leads are copper-clad steel with tin/lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of circuit during conduction; unmarked end of device |
| Cathode | Forward current exit / reverse blocking terminal | Marked with visible band; connected to higher-potential side; blocks 70 V reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/118 Qualified | JANTXV level - meets screening, testing, and traceability requirements for defense and space programs |
| Hermetic Glass Package | DO-213AA outline - prevents moisture ingress and parameter drift over 20+ year service life |
| Metallurgical Bonding | Eliminates wire bonds - improves thermal transfer and vibration resistance in high-G environments |
| Double Plug Construction | Reduces series inductance below 1 nH - supports >10 MHz switching in RF detector and clamp circuits |
| Wide Temperature Operation | -65°C to +175°C - enables use in turbine control modules and deep-well telemetry without derating |
Applications
| Avionics Power Sequencing | Downhole Sensor Protection |
|---|---|
Use Scenario: Isolating auxiliary power rails during cold-start sequencing in flight control computers. IC Role / Device Role / Timing Role: Clamping diode preventing backfeed between isolated 5 V and 28 V domains. Use Value: 70 V VRWM and 2 A surge rating absorb coupling transients without latch-up or degradation. | Use Scenario: Protecting analog front-end inputs of pressure/temperature sensors in oil/gas wellhead controllers. IC Role / Device Role / Timing Role: Reverse-polarity and ESD protection element at signal conditioning stage. Use Value: 0.025 µA IR at 70 V preserves microamp-level sensor bias currents across full temperature range. |
| Turbine Engine Monitoring | Spacecraft Battery Management |
Use Scenario: Rectifying thermocouple signal conditioning outputs in jet engine health monitoring units. IC Role / Device Role / Timing Role: Low-VF switching diode in precision half-wave rectifier for millivolt-level AC signals. Use Value: 0.8–1.0 V VF minimizes offset error in signal chain; DO-213AA package withstands 175°C ambient. | Use Scenario: Preventing reverse current flow from Li-ion battery packs into solar charge controllers during eclipse periods. IC Role / Device Role / Timing Role: Blocking diode in battery backup path with ultra-low leakage requirement. Use Value: ≤0.025 µA IR at 70 V eliminates measurable self-discharge over multi-year orbital missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5194US | Same die, but in DO-213AB (slightly longer) package; identical electrical specs | Requires minor footprint adjustment; same thermal and reliability performance | Select when DO-213AB land pattern is already validated in design |
| 1N5408G | Higher IF(AV) = 3 A, but larger DO-201AD package; VRWM = 1000 V; IR = 5 µA @ 1000 V | Over-specified for 70 V systems; unsuitable where size or leakage is constrained | Only consider if surge robustness >2 A or voltage >70 V is required |
Compared with 1N5194UR/TR, 1N5194US offers identical electrical behavior in a mechanically distinct package, while 1N5408G trades ultra-low leakage and compact size for higher voltage and current ratings - making it inappropriate for space-constrained, low-leakage, or high-temperature military applications served by the 1N5194UR/TR.
Availability
1N5194UR/TR is available at Aetrix Electronics and suitable for avionics power sequencing, downhole sensor protection, and turbine engine monitoring requiring stable component supply across extended temperature and long-life program cycles.
Supply support for 1N5194UR/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 semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance and extended temperature operation.
The 1N5194UR/TR belongs to Microsemi's MIL-qualified discrete diode family, engineered specifically for mission-critical power control and signal integrity in harsh-environment electronics.
FAQ
What is the qualified reliability level of the 1N5194UR/TR?
The 1N5194UR/TR is qualified to MIL-PRF-19500/118 at JANTXV level, including rigorous screening for burn-in, temperature cycling, and hermeticity testing. This ensures suitability for Class S space applications and high-integrity defense systems where failure is not an option. The 1N5194UR/TR data sheet LDS-0032 Rev. 1 confirms full compliance with these requirements.
Does the 1N5194UR/TR have a specified reverse recovery time (trr)?
No - the 1N5194UR/TR datasheet does not specify reverse recovery time, as it is optimized for general-purpose switching rather than ultra-high-frequency operation. Its double-plug construction and metallurgical bonding yield low stored charge, but trr is not characterized or guaranteed. For timing-critical applications requiring defined trr, consult Microsemi's 1N5711 or HS-series diodes instead of the 1N5194UR/TR.
What is the lead finish and material for the 1N5194UR/TR?
The 1N5194UR/TR uses copper-clad steel leads with a tin/lead (Sn/Pb) finish, per MIL-PRF-19500/118 requirements. This composition provides solderability consistency, mechanical strength, and compatibility with legacy wave-solder processes. The 1N5194UR/TR's lead finish is explicitly documented in the "DESIGN DATA" section of its official datasheet.
Can the 1N5194UR/TR be used in surface-mount assemblies?
No - the 1N5194UR/TR is a through-hole device in DO-213AA glass package with axial leads; it is not designed for SMT reflow or placement. Its hermetic glass body and lead geometry require manual or wave-solder insertion. For SMT equivalents, consider Microsemi's JANSR1N5194UR or other qualified surface-mount diodes - not the 1N5194UR/TR.
What is the maximum junction temperature for the 1N5194UR/TR?
The 1N5194UR/TR has a maximum junction temperature of +175°C, aligned with its -65°C to +175°C operating temperature range. This rating is sustained under full-rated current and voltage conditions when thermal impedance remains ≤70°C/W. Derating is required above 25°C ambient, and the 1N5194UR/TR must be mounted to maintain this thermal path in actual application layouts.
1N5194UR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Sigma Bond™
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 70 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 25 nA @ 70 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
- Operating Temperature - Junction:
- -55°C ~ 200°C
1N5194UR/TR FAQ
1.How can I place an order for 1N5194UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5194UR/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 1N5194UR/TR reliable?
The price and inventory of 1N5194UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5194UR/TR is usually 5 days.
3.What payment methods are accepted for 1N5194UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5194UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5194UR/TR?
1N5194UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5194UR/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 1N5194UR/TR?
For technical support, including 1N5194UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5194UR/TR requirements.
6.How does Aetrix verify that 1N5194UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N5194UR/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 1N5194UR/TR meets industry standards.
7.What is the process for return or replacement of 1N5194UR/TR?
All 1N5194UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5194UR/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 1N5194UR/TR part is unused and in its original packaging.
Return procedure for 1N5194UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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