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Microchip Technology 1N4500
- Part No.:
- 1N4500
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4500.pdf
- Description:
- DIODE GEN PURP DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,707
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Product details
Overview
1N4500 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 operating up to +175°C ambient. It delivers fast 6.0 ns turn-off time with low 0.56 V forward voltage at 0.25 mA, suited for high-reliability military timing and pulse shaping circuits.
For engineers reviewing the 1N4500 datasheet, 1N4500 pinout, 1N4500 application, or 1N4500 equivalent, key selection criteria include MIL-PRF-19500/403 qualification, hermetic DO-35 packaging, 100 nA max leakage at 75 V, 4 A 1 µs surge rating, and thermal resistance of 70°C/W - all critical for aerospace pulse discriminators and radiation-tolerant signal conditioning.
Technical Context
The 1N4500 is a silicon planar switching diode built using metallurgical bonding and double-plug construction inside a hermetically sealed glass DO-35 case. Its design enables stable operation across –65°C to +175°C junction temperature with controlled capacitance (≤4.0 pF at 0 V) and fast recovery (≤6.0 ns).
Qualified to MIL-PRF-19500/403 at JAN and JANTX levels, the 1N4500 features tin/lead-plated copper-clad steel leads, cathode band marking, and derating of 2.0 mA/°C above 25°C ambient - supporting use in hardened analog front-ends where parameter stability under thermal stress is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 75 V DC - maximum blocking voltage before breakdown at +25°C, defining safe operating range in clamp and protection circuits |
| Forward Voltage (VF) | 0.56 V max at IF = 0.25 mA - low conduction loss enabling efficient low-current switching in timing networks |
| Reverse Leakage (IR) | 100 nA max at VR = 75 V - ensures minimal standby current in high-impedance sample-hold and trigger circuits |
| Turn-off Time (trr) | 6.0 ns max - supports >100 MHz pulse edge fidelity in RF detector and fast logic interface applications |
| Surge Current (IFSM) | 4 A peak for 1 µs - withstands transient overloads in radar pulse modulators and ESD-coupled signal paths |
| Thermal Resistance (RθJA) | 70°C/W - defines junction-to-ambient rise per watt, critical for thermal design in sealed military enclosures |
| Operating Temperature | –65°C to +175°C - validated performance envelope for engine bay, avionics, and downhole electronics |
Pinout & Package
Package: Hermetically sealed glass DO-35 per MIL-PRF-19500/403; cathode identified by axial band; lead material: copper-clad steel with tin/lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for forward conduction | Connected to internal P-region; accepts current flow when biased positive relative to cathode |
| Cathode | Negative terminal; marked with axial band | Connected to internal N-region; defines polarity for correct orientation in series-switching and clamping topologies |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/403 Qualified | Validated reliability for defense/aerospace programs requiring JAN/JANTX screening and lot traceability |
| Hermetic Glass Encapsulation | Prevents moisture ingress and parameter drift over decades in vacuum or high-humidity environments |
| Double Plug Construction | Enhances mechanical robustness and thermal cycling endurance in vibration-prone airborne systems |
| Metallurgical Bonding | Eliminates wire bonds, reducing failure modes in high-G shock environments like missile guidance |
| Low Capacitance (≤4.0 pF) | Minimizes signal distortion in RF sampling and ultrafast pulse detection circuits |
Applications
| Radar Pulse Modulator | Aerospace Timing Discriminator |
|---|---|
Use Scenario: High-voltage, nanosecond-rise-time pulse generation in airborne fire-control radar transmitters. IC Role / Device Role / Timing Role: Fast-switching clamp diode in pulse-forming network (PFN) discharge path. Use Value: 6.0 ns trr and 4 A 1 µs surge rating ensure clean pulse edges and survivability during repeated high-power switching. | Use Scenario: Edge-triggered event capture in inertial navigation system clock synchronization. IC Role / Device Role / Timing Role: Input protection and signal sharpening diode in precision timing comparator front-end. Use Value: 100 nA leakage at 75 V and –65°C to +175°C operation maintain timing accuracy across extreme thermal cycles. |
| Downhole Logging Sensor Interface | Military Radio Frequency Detector |
Use Scenario: Signal conditioning in oil/gas wellbore telemetry modules exposed to >150°C ambient. IC Role / Device Role / Timing Role: Reverse-biased clamping element protecting ADC inputs from ESD and cable reflections. Use Value: Hermetic DO-35 package and 70°C/W thermal resistance prevent parametric shift and thermal runaway at sustained high temperature. | Use Scenario: Envelope detection in secure HF/VHF tactical radios operating in harsh electromagnetic environments. IC Role / Device Role / Timing Role: Low-capacitance (≤4.0 pF) switching diode in crystal detector stage. Use Value: Minimal junction capacitance preserves RF bandwidth and detection sensitivity without tuning compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W | Plastic SOD-123 package; 100 V VR; 4 ns trr; not MIL-qualified | Commercial industrial controls; no hermeticity or extended temperature support | Choose only if cost and volume outweigh military reliability requirements |
| 1N5711 | Schottky structure; 70 V VR; 0.28 V VF; 150°C max TJ; no MIL qualification | Low-voltage RF detection; higher leakage (>1 µA) limits use in precision timing | Select when ultra-low VF matters more than leakage or temperature range |
Compared with 1N4500, the 1N4148W offers faster switching but lacks hermetic sealing and MIL qualification needed for mission-critical systems; the 1N5711 provides lower forward drop but trades off leakage and temperature capability - making 1N4500 uniquely suited for high-stability, high-survivability pulse applications.
Availability
1N4500 is available at Aetrix Electronics and suitable for radar pulse modulators, aerospace timing discriminators, and downhole sensor interfaces requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for 1N4500 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, extended temperature operation, and military qualification.
The 1N4500 belongs to Microsemi's legacy MIL-PRF-19500/403 qualified switching diode family, engineered specifically for pulse-shaping, clamping, and timing functions in mission-critical analog signal chains.
FAQ
What is the maximum reverse voltage rating for the 1N4500?
The 1N4500 has a maximum DC reverse voltage rating of 75 V at +25°C ambient, as specified in its LDS-0154 Rev. 1 datasheet. This rating decreases with increasing temperature and must be applied with appropriate derating - especially above 25°C where current must be reduced by 2.0 mA/°C. The 1N4500 maintains this VR rating within its qualified MIL-PRF-19500/403 framework.
Is the 1N4500 suitable for high-temperature environments?
Yes, the 1N4500 is rated for continuous operation from –65°C to +175°C junction temperature and storage up to +200°C. Its hermetically sealed DO-35 glass package and metallurgical bonding enable stable electrical parameters across this full range, making the 1N4500 appropriate for engine-mounted sensors, avionics bays, and downhole tools where thermal resilience is non-negotiable.
Does the 1N4500 have a defined turn-off time specification?
Yes, the 1N4500 specifies a maximum reverse recovery time (trr) of 6.0 ns at IF = IR = 10 mA and RL = 100 Ω, measured at +25°C. This value is confirmed in the AC Electrical Characteristics table of the LDS-0154 datasheet and reflects the device's suitability for high-speed pulse applications such as RF detection and digital timing circuits where edge fidelity is essential.
How is polarity identified on the 1N4500 package?
The cathode terminal of the 1N4500 is marked with a distinct axial color band on the glass DO-35 body - consistent with industry-standard diode marking practice. This band aligns with the cathode connection on the internal die and must be oriented toward the negative side of the circuit. The anode is the unmarked end, and both leads are tin/lead-plated copper-clad steel per the package drawing in LDS-0154.
What surge current can the 1N4500 withstand?
The 1N4500 is rated for 4 A peak surge current for 1 µs (sine wave) and 0.5 A for 1 s (sine wave), per its Maximum Ratings table. These values reflect its robust metallurgical construction and hermetic sealing, allowing the 1N4500 to absorb transient energy in radar modulators and ESD-protected interfaces without degradation - provided average power dissipation remains within thermal limits.
1N4500 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N4500 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4500 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 reliable?
The price and inventory of 1N4500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4500 is usually 5 days.
3.What payment methods are accepted for 1N4500?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4500 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4500?
1N4500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4500 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?
For technical support, including 1N4500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4500 requirements.
6.How does Aetrix verify that 1N4500 is sourced from the original manufacturer or authorized distributors?
All 1N4500 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 meets industry standards.
7.What is the process for return or replacement of 1N4500?
All 1N4500 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4500, 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 part is unused and in its original packaging.
Return procedure for 1N4500:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4500 Tags
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