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Microchip Technology 1N5279A
- Part No.:
- 1N5279A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5279A.pdf
- Description:
- DIODE ZENER 180V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
1N5279A from Microsemi is a 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 180 V nominal Zener voltage at 0.68 mA test current, with ±10% tolerance, 6000 Ω maximum Zener impedance at 0.25 mA, and temperature coefficient of +0.110 %/°C - used for precision voltage reference and overvoltage protection in high-voltage power supply feedback loops.
For engineers reviewing the 1N5279A datasheet, 1N5279A pinout, 1N5279A application, or 1N5279A equivalent, key selection criteria include Zener voltage stability across temperature, low leakage at rated reverse voltage, thermal resistance in axial-lead mounting, and compatibility with MIL-PRF-19500 screening options when extended reliability is required.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-bias breakdown mode, with Zener voltage specified at IZT = 0.68 mA and characterized over -65°C to +175°C operating temperature range. Its 250 °C/W junction-to-lead thermal resistance assumes 3/8" (10 mm) lead length from body, enabling stable regulation under sustained power dissipation up to 500 mW at 25°C ambient.
The 1N5279A exhibits minimal capacitance per Figure 2 (typical <1.5 pF), low ESD sensitivity (MIL-STD-750 Method 1020), and inherent radiation hardness per MicroNote 050 - making it suitable for aerospace and industrial environments where electrical noise immunity and long-term parametric stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 180 V at 0.68 mA test current - defines precise regulation point for high-voltage reference circuits |
| Zener Tolerance | ±10% (A suffix) - ensures predictable voltage window for design margining in feedback networks |
| Max Zener Impedance | 6000 Ω at IZK = 0.25 mA - indicates dynamic resistance affecting regulation accuracy under light-load transients |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Temp Coefficient αVZ | +0.110 %/°C - quantifies voltage drift magnitude over temperature, critical for wide-range operation |
| Max Reverse Current | 10 μA at VR = 144 V - defines leakage level below breakdown, impacting standby power in high-impedance bias networks |
| Forward Voltage | 1.5 V max at 200 mA - relevant for polarity-check or fault-detection forward conduction paths |
Pinout & Package
Hermetically sealed axial-lead DO-35 (DO-204AH) glass package with cathode indicated by band; operated with banded end positive relative to unbanded end during Zener regulation. Weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common or lower-potential rail; establishes return path for Zener current |
| Cathode (banded end) | Regulated output node | Provides stabilized 180 V reference; must be biased positive relative to anode to maintain breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability with legacy 1N52xx designs across manufacturers |
| RoHS-compliant option (e3 suffix) | Enables compliance with environmental directives without sacrificing Zener performance or thermal rating |
| MIL-PRF-19500 screening availability | Supports JAN/JANTX-level qualification for defense/aerospace applications via MQ/MX prefix addition |
| Low capacitance (<1.5 pF typical) | Minimizes high-frequency signal coupling and noise injection in sensitive analog or RF-adjacent circuits |
Applications
| High-Voltage Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output of isolated flyback or forward converter operating above 150 V DC. IC Role / Device Role / Timing Role: Zener reference element in optocoupler-based feedback loop, setting precise output voltage threshold. Use Value: 180 V nominal Zener voltage enables direct sensing of high-output rails without resistive divider scaling errors. | Use Scenario: Protecting downstream circuitry from transient surges exceeding 180 V in telecom line interface cards. IC Role / Device Role / Timing Role: Shunt clamping device that conducts excess energy to ground when input exceeds 180 V ±10%. Use Value: 500 mW power rating allows absorption of short-duration transients without thermal runaway or parameter shift. |
| Industrial Sensor Excitation Reference | Aerospace Voltage Monitor Calibration |
Use Scenario: Providing stable excitation voltage for high-impedance piezoresistive pressure sensors in oilfield instrumentation. IC Role / Device Role / Timing Role: Precision DC reference source maintaining constant bias across wide temperature (-65°C to +175°C). Use Value: +0.110 %/°C tempco and hermetic DO-35 package ensure long-term calibration stability in harsh environments. | Use Scenario: Calibrating voltage monitoring circuits in satellite power distribution units requiring radiation-tolerant components. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference used in self-test and fault-detection subsystems. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for additional shielding or derating in space-grade designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5279B | ±5% Zener tolerance vs. ±10% for 1N5279A; otherwise identical electrical and thermal specs | Used where tighter voltage accuracy is required in feedback or reference circuits | Select 1N5279B when system-level voltage margin allows reduced tolerance without cost or sourcing penalty |
| MMBZ5279B (SOT-23) | Surface-mount MMBZ5279B offers same 180 V/±5% spec but in SOT-23 package; lower power rating (350 mW) | Preferred for space-constrained PCBs where axial-leaded DO-35 footprint is prohibitive | Choose MMBZ5279B only if thermal management supports 350 mW derated operation and layout permits SMT placement |
Compared with 1N5279B and MMBZ5279B, the 1N5279A provides the lowest-cost, highest-power axial-lead solution for 180 V reference needs - balancing tolerance, thermal robustness, and legacy compatibility without requiring PCB redesign.
Availability
1N5279A is available at Aetrix Electronics and suitable for high-voltage power supply feedback, overvoltage protection clamping, and industrial sensor excitation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5279A 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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xx series was designed specifically for robust, low-drift voltage regulation in mission-critical systems where long-term stability, wide temperature operation, and proven JEDEC-standard form factor are mandatory.
FAQ
What is the Zener voltage tolerance for the 1N5279A?
The 1N5279A has a nominal Zener voltage of 180 V with a guaranteed tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This tolerance applies under standard test conditions (IZT = 0.68 mA, TA = 25°C) and defines the allowable voltage spread for design margining in feedback or protection circuits using the 1N5279A.
Can the 1N5279A be used in surface-mount designs?
No - the 1N5279A is packaged exclusively in the axial-lead DO-35 (DO-204AH) glass case and requires through-hole mounting. For surface-mount alternatives, consider the MMBZ5279B in SOT-23, which shares the same 180 V rating but is rated for 350 mW and not a drop-in replacement for the 1N5279A.
What is the maximum reverse leakage current for the 1N5279A?
The 1N5279A specifies a maximum reverse current (IR) of 10 μA at VR = 144 V (80% of nominal Zener voltage). This value is measured after 20 seconds of stabilization with 3/8" lead length and reflects leakage behavior critical for low-power bias networks where quiescent current must remain tightly bounded.
Is the 1N5279A suitable for aerospace applications?
Yes - the 1N5279A can be supplied with MIL-PRF-19500 screening (e.g., MQ, MX prefixes) for JAN/JANTX qualification, and its inherent radiation hardness per MicroNote 050 makes it appropriate for aerospace voltage reference and monitor functions. Full qualification requires ordering the screened variant, not the base 1N5279A.
How does temperature affect the Zener voltage of the 1N5279A?
The 1N5279A has a positive temperature coefficient of +0.110 %/°C, meaning its Zener voltage increases linearly with rising junction temperature. This behavior is verified from 25°C to 125°C at rated test current and must be factored into designs operating across wide ambient ranges, especially where absolute voltage accuracy is required.
1N5279A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 180 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 2200 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 137 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5279A FAQ
1.How can I place an order for 1N5279A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5279A 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 1N5279A reliable?
The price and inventory of 1N5279A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5279A is usually 5 days.
3.What payment methods are accepted for 1N5279A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5279A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5279A?
1N5279A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5279A 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 1N5279A?
For technical support, including 1N5279A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5279A requirements.
6.How does Aetrix verify that 1N5279A is sourced from the original manufacturer or authorized distributors?
All 1N5279A 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 1N5279A meets industry standards.
7.What is the process for return or replacement of 1N5279A?
All 1N5279A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5279A, 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 1N5279A part is unused and in its original packaging.
Return procedure for 1N5279A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5279A Tags
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BZT52C5V6T-7
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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