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Microchip Technology 1N4500/TR
- Part No.:
- 1N4500/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4500/TR.pdf
- Description:
- DIODE GEN PURP DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
1N4500/TR from Microsemi is a hermetically sealed, metallurgically bonded switching diode in DO-35 glass package, rated for 75 V reverse voltage, 0.5 A surge current (1 s sine), and 4 A surge current (1 µs sine), with 100 nA leakage at 75 V and 25°C - used in high-reliability military timing, pulse shaping, and clamping circuits.
For engineers reviewing the 1N4500/TR datasheet, 1N4500/TR pinout, 1N4500/TR application, or 1N4500/TR equivalent, key selection criteria include MIL-PRF-19500/403 qualification, -65°C to +175°C operating range, low 4.0 pF capacitance at 0 V, fast 6.0 ns recovery time, and hermetic DO-35 packaging for harsh-environment signal routing.
Technical Context
This diode employs double-plug construction and metallurgical bonding to ensure stable junction characteristics under thermal cycling and mechanical stress. Its hermetic glass seal meets MIL-PRF-19500/403 Class JANTX requirements, supporting operation up to +175°C ambient with derating of 2.0 mA/°C above 25°C.
Designed for high-speed switching, the 1N4500/TR delivers 6.0 ns reverse recovery time at IF = IR = 10 mA and RL = 100 Ω, with forward voltage ranging from 0.47 V (0.25 mA) to 1.10 V (300 mA), and exhibits only 4.0 pF junction capacitance at zero bias - critical for RF detector and pulse generator front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 75 V - maximum DC blocking capability at 25°C; defines safe operating limit in clamp and protection circuits |
| Surge Current (1 µs) | 4 A - supports transient overvoltage suppression without junction failure in pulse applications |
| Reverse Recovery Time | 6.0 ns - enables reliable operation in >100 MHz switching and RF detection circuits |
| Junction Capacitance | 4.0 pF at 0 V - minimizes signal loading in high-frequency sampling and mixer bias networks |
| Leakage Current | 100 nA at 75 V, 25°C - ensures low standby power loss in precision timing and sample-hold stages |
| Operating Temperature | -65°C to +175°C - qualified for aerospace, downhole, and engine-control environments |
Pinout & Package
Hermetically sealed DO-35 glass package with axial leads; cathode identified by band on glass body; lead material is copper-clad steel with tin/lead finish; thermal resistance 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node in rectifier/clamp; must handle 0.5 A continuous surge derated above 25°C |
| Cathode | Forward current exit / reverse blocking terminal | Banded end; referenced to system ground or higher-potential rail in flyback and snubber paths |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/403 Qualified | JANTX level - guarantees screening, traceability, and reliability for defense/aerospace programs |
| Hermetic Glass Seal | Prevents moisture ingress and parameter drift over 20+ years in sealed enclosures |
| Double Plug Construction | Reduces thermal resistance and improves bond integrity during thermal shock testing |
| Low 4.0 pF Capacitance | Enables use in UHF detector stages without retuning matching networks |
Applications
| Radar Pulse Clamping | Avionics Timing Reference |
|---|---|
Use Scenario: Clamp fast-rising radar transmit pulses to protect receiver front-end amplifiers from overvoltage. IC Role / Device Role / Timing Role: Fast-switching voltage limiter placed across LNA input with sub-6 ns recovery. Use Value: 4.0 pF capacitance avoids detuning 1–3 GHz antenna coupling networks; 75 V rating matches typical pulse peak amplitudes. | Use Scenario: Generate clean trigger edges from noisy aircraft engine tachometer signals. IC Role / Device Role / Timing Role: Signal conditioning diode in Schmitt-trigger input stage of flight control timing module. Use Value: 100 nA leakage preserves threshold stability over -55°C to +125°C; MIL-qualified reliability ensures no field failures. |
| Downhole Instrumentation | Military Power Sequencing |
Use Scenario: Protect sensor interface ICs in oil/gas well logging tools exposed to 175°C ambient. IC Role / Device Role / Timing Role: Reverse-biased guard diode isolating analog front-end from high-temp power rails. Use Value: Guaranteed operation to +175°C with 2.0 mA/°C derating allows direct integration without heatsinking. | Use Scenario: Control power-up sequencing in secure comms radios using discrete diode logic. IC Role / Device Role / Timing Role: Anode-cathode path enabling voltage-dependent enable delay between DC/DC converter stages. Use Value: 0.47–1.10 V forward drop provides predictable timing offset; JANTX screening ensures lot-to-lot consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148WS | Surface-mount SOD-323 package; 100 V VR; 4.0 pF Cj; not MIL-qualified | Used in commercial PCBs where space-constrained layout prohibits axial DO-35 | Select when volume production, reflow assembly, and cost sensitivity outweigh military screening needs |
| 1N5711 | Schottky barrier; 70 V VR; 0.25 V typical VF; 1.0 ns trr; not hermetic | Preferred in low-voltage, ultrafast sampling where forward drop and speed dominate reliability | Choose only if 0.25 V VF and 1.0 ns recovery justify trade-off in temperature range (-65°C to +125°C) and hermeticity |
Compared with 1N4500/TR, 1N4148WS offers SMT compatibility but lacks MIL qualification and hermetic sealing, while 1N5711 delivers faster switching and lower VF at the expense of reduced max operating temperature and non-hermetic construction - both require redesign for mechanical mounting and environmental validation.
Availability
1N4500/TR is available at Aetrix Electronics and suitable for radar pulse clamping, avionics timing reference, and downhole instrumentation requiring stable component supply across extended temperature and long-life deployments.
Supply support for 1N4500/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) specialized in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets before acquisition.
The 1N4500/TR belongs to Microsemi's legacy MIL-qualified discrete diode family, engineered specifically for mission-critical switching, clamping, and protection in extreme-temperature and radiation-tolerant systems.
FAQ
What is the maximum reverse voltage rating for the 1N4500/TR?
The 1N4500/TR has a maximum DC reverse voltage rating of 75 V at 25°C ambient temperature. This value is specified in the LDS-0154 Rev. 1 datasheet and applies under steady-state conditions. Derating is required above 25°C per the 2.0 mA/°C rule for forward current, though reverse voltage rating remains fixed unless otherwise noted in MIL-PRF-19500/403 test limits. The 1N4500/TR maintains this rating across its full -65°C to +175°C operating range.
Is the 1N4500/TR suitable for high-frequency applications?
Yes, the 1N4500/TR is suitable for high-frequency applications due to its 4.0 pF junction capacitance at 0 V and 6.0 ns reverse recovery time measured at IF = IR = 10 mA and RL = 100 Ω. These parameters support reliable operation in RF detector, pulse generator, and UHF sampling circuits. The 1N4500/TR's hermetic DO-35 package also prevents parasitic shifts over time, preserving high-frequency performance in sealed systems.
Does the 1N4500/TR meet military specifications?
Yes, the 1N4500/TR is qualified per MIL-PRF-19500/403 at JANTX level, including screening for vibration, thermal shock, and hermeticity. It carries JAN/JANTX markings and is traceable to lot-controlled manufacturing. The 1N4500/TR's qualification covers electrical, mechanical, and environmental tests defined in the specification - confirming suitability for defense electronics where reliability and documentation rigor are mandatory.
What is the thermal resistance of the 1N4500/TR?
The 1N4500/TR has a maximum thermal resistance of 70°C/W, as stated in the "Design Data" section of the LDS-0154 datasheet. This value reflects junction-to-ambient conduction through the DO-35 glass package and axial leads. The 1N4500/TR's metallurgically bonded die and double-plug construction contribute to this thermal performance, enabling operation at +175°C ambient when power dissipation remains within derated limits.
How is polarity identified on the 1N4500/TR?
Polarity on the 1N4500/TR is identified by a visible cathode band on the glass body - the banded end is the cathode terminal. This marking complies with industry-standard axial diode conventions and is confirmed in the "Design Data" section of the LDS-0154 datasheet. When installing the 1N4500/TR, the banded end must connect toward the more positive potential in forward-bias configurations or serve as the reference node in reverse-biased clamping circuits.
1N4500/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 300 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 6 ns
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 175°C
1N4500/TR FAQ
1.How can I place an order for 1N4500/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4500/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 1N4500/TR reliable?
The price and inventory of 1N4500/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4500/TR is usually 5 days.
3.What payment methods are accepted for 1N4500/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4500/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4500/TR?
1N4500/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4500/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 1N4500/TR?
For technical support, including 1N4500/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4500/TR requirements.
6.How does Aetrix verify that 1N4500/TR is sourced from the original manufacturer or authorized distributors?
All 1N4500/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 1N4500/TR meets industry standards.
7.What is the process for return or replacement of 1N4500/TR?
All 1N4500/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4500/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 1N4500/TR part is unused and in its original packaging.
Return procedure for 1N4500/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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