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Microchip Technology 1N4486US
- Part No.:
- 1N4486US
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4486US.pdf
- Description:
- DIODE ZENER 75V 1.5W SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,390
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Product details
Overview
1N4486US from Microsemi is a hermetically sealed, voidless glass MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with a nominal Zener voltage of 75.0 V at 3.3 mA test current, ±5% tolerance, and maximum dynamic impedance of 130 Ω at IZT; it is qualified to MIL-PRF-19500/406 (JAN/JANTXV levels) and used in high-reliability voltage regulation for aerospace power conditioning circuits.
For engineers reviewing the 1N4486US datasheet, 1N4486US pinout, 1N4486US application, or 1N4486US equivalent, this page delivers verified military-grade Zener specifications, thermal derating behavior, junction-to-end-cap thermal resistance (20 °C/W), reverse leakage limits (≤0.25 µA at 60.0 V), and direct alternatives with documented voltage/tolerance/package alignment.
Technical Context
The 1N4486US operates as a precision voltage reference in breakdown mode, with Zener voltage specified at IZT = 3.3 mA and knee current IZK = 0.25 mA. Its 130 Ω dynamic impedance at IZT and 2000 Ω at IZK define regulation stability across load and temperature variations.
Designed for end-cap thermal mounting, it features a 20 °C/W junction-to-end-cap thermal resistance and supports pulsed surge currents up to 0.19 A (8.3 ms square wave), with junction temperature range from –65 °C to +175 °C and RoHS-compliant commercial variants available.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75.0 V ±5% at IZT = 3.3 mA - defines stable regulation point under nominal bias |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - sets maximum continuous DC power handling at ambient |
| Dynamic Impedance (ZZT) | 130 Ω @ IZT - determines output voltage variation under small-signal load changes |
| Max Reverse Current (IR) | 0.25 µA @ VR = 60.0 V - ensures low leakage in standby or high-impedance bias networks |
| Junction Temperature Range | –65 °C to +175 °C - enables operation in extreme environmental conditions without derating loss |
| Thermal Resistance (RθJEC) | 20 °C/W - quantifies thermal path efficiency from junction to end-cap for heatsink design |
| Surge Current (IZSM) | 0.19 A @ 8.3 ms - supports transient overvoltage clamping without degradation |
Pinout & Package
Package: A (D-5A) MELF - hermetically sealed voidless glass case with tungsten slugs, cathode indicated by polarity band, tin/lead or RoHS matte tin terminations, weight 193 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring long-term parameter stability in harsh environments |
| Triple-layer passivation | Enhances surface insulation and reduces leakage current drift under humidity or bias stress |
| MIL-PRF-19500/406 qualification | Validated reliability for JAN/JANTXV levels - required for flight-critical and defense electronics |
| Category I metallurgical bond | Internal tungsten-copper bond structure rated for high mechanical shock and thermal cycling endurance |
| Non-ESD-sensitive construction | Withstands MIL-STD-750 Method 1020 ESD testing without parameter shift or failure |
Applications
| Aerospace Power Bus Regulation | Defense Avionics Reference Supply |
|---|---|
Use Scenario: Stabilizing 28 VDC aircraft bus-derived auxiliary rails in flight control computers. IC Role / Device Role / Timing Role: Zener voltage reference in shunt regulator topology for analog sensor excitation and ADC reference buffers. Use Value: Maintains ±0.5% output stability over –55 °C to +125 °C with <0.25 µA leakage at 60 V, minimizing sensor offset drift. |
Use Scenario: Providing hardened bias voltage for radiation-tolerant FPGAs in missile guidance subsystems. IC Role / Device Role / Timing Role: Primary voltage clamp in dual-redundant power monitor circuits detecting overvoltage faults. Use Value: Survives 100 krad(Si) total ionizing dose per MicroNote 050 and maintains 75 V regulation during 8.3 ms transients. |
| Satellite Payload Power Conditioning | High-Reliability Industrial PLC Input Protection |
Use Scenario: Regulating secondary supply for star tracker CCD biasing in LEO satellites. IC Role / Device Role / Timing Role: Precision Zener element in temperature-compensated reference ladder network. Use Value: Delivers 75 V ±5% with <130 Ω dynamic impedance, enabling sub-mV reference ripple under 10 kHz switching noise. |
Use Scenario: Overvoltage protection for 24 VDC digital input modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt clamp triggered by transient events exceeding 60 V threshold. Use Value: Absorbs 0.19 A surge (8.3 ms) without parametric shift, preserving downstream optocoupler integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4486 | Same electrical specs but DO-41 axial-leaded package; no MIL-PRF-19500 qualification; 5% tolerance only | Lacks hermetic seal and military screening; unsuitable for vibration-prone or vacuum environments | Select when cost-sensitive commercial designs allow axial through-hole mounting and relaxed reliability requirements |
| SMF75A | Surface-mount SOD-123 package; 75 V, 1.0 W, ±5%; no military qualification; 1000 Ω ZZT at 1 mA | Lower power rating and higher dynamic impedance limit use to non-critical signal-level clamping | Choose for space-constrained PCBs where full 1.5 W dissipation and ultra-low leakage are not required |
Compared with 1N4486US, the 1N4486 lacks hermetic sealing and MIL qualification, limiting its use in mission-critical systems; SMF75A offers smaller footprint but sacrifices 33% power handling and regulation precision, making it suitable only for less demanding industrial applications.
Availability
1N4486US is available at Aetrix Electronics and suitable for aerospace power bus regulation, defense avionics reference supply, and satellite payload power conditioning requiring stable component supply across extended temperature ranges and long lifecycle commitments.
Supply support for 1N4486US 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 components for aerospace, defense, and industrial markets.
The 1N4486US belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation in safety-critical systems where parameter stability, radiation hardness, and hermetic integrity are mandatory.
FAQ
What is the Zener voltage tolerance and test current for the 1N4486US?
The 1N4486US has a nominal Zener voltage of 75.0 V with a standard tolerance of ±5%, measured at a test current (IZT) of 3.3 mA. This tolerance reflects manufacturing spread under controlled conditions and is consistent across JAN/JANTXV screening levels. The 1N4486US does not include tighter-tolerance suffixes (e.g., 'C' for ±2% or 'D' for ±1%) in its nomenclature, confirming its 5% rating.
Is the 1N4486US RoHS compliant?
The 1N4486US is available in both RoHS-compliant and non-RoHS versions: RoHS compliance is indicated by the 'e3' suffix in the full part number (e.g., 1N4486US e3), and applies only to commercial-grade units. Military-grade variants (JAN/JANTXV) retain Sn/Pb terminations and are exempt from RoHS per J-STD-609. The 1N4486US itself, as marked, may be either depending on ordering code.
What is the maximum reverse leakage current specification for the 1N4486US?
The 1N4486US specifies a maximum reverse leakage current (IR) of 0.25 µA at a reverse voltage (VR) of 60.0 V and TA = 25 °C. This value is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0183-1 Rev. 1 and remains valid across the full operating temperature range due to hermetic sealing and triple-layer passivation.
Does the 1N4486US have a defined thermal impedance curve?
Yes - the 1N4486US falls within the 1N4462US–1N4496US group covered by Figure 3 in the datasheet, which plots thermal impedance (ZθJX) versus heating time. At 10 ms, its thermal impedance is approximately 100 °C/W, supporting short-duration surge energy absorption while maintaining junction temperature within safe limits.
How is polarity marked on the 1N4486US MELF package?
The 1N4486US uses a single cathode band for polarity identification, consistent with JEDEC MELF marking standards. The band denotes the cathode terminal, which must be connected to the higher-potential node in Zener regulation applications. No anode marking is present; the unmarked end is the anode. This marking is visible under standard optical inspection and survives solder reflow per EIA-481-B tape-and-reel handling.
1N4486US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 250 nA @ 60 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- A, SQ-MELF
1N4486US FAQ
1.How can I place an order for 1N4486US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4486US 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 1N4486US reliable?
The price and inventory of 1N4486US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4486US is usually 5 days.
3.What payment methods are accepted for 1N4486US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4486US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4486US?
1N4486US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4486US 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 1N4486US?
For technical support, including 1N4486US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4486US requirements.
6.How does Aetrix verify that 1N4486US is sourced from the original manufacturer or authorized distributors?
All 1N4486US 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 1N4486US meets industry standards.
7.What is the process for return or replacement of 1N4486US?
All 1N4486US units undergo pre-shipment inspection (PSI). If there is an issue with 1N4486US, 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 1N4486US part is unused and in its original packaging.
Return procedure for 1N4486US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4486US Tags
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