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Microchip Technology 1N5279B/TR
- Part No.:
- 1N5279B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5279B/TR.pdf
- Description:
- DIODE ZENER 180V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,640
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Product details
Overview
1N5279B/TR 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 ±5% tolerance (B suffix), 600 Ω maximum Zener impedance at IZK = 0.25 mA, and temperature coefficient of +0.110 %/°C - used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5279B/TR datasheet, 1N5279B/TR pinout, 1N5279B/TR application, or 1N5279B/TR equivalent, key selection criteria include Zener voltage stability across temperature, low leakage (<0.1 μA at VR), axial-leaded DO-35 mechanical compatibility, and RoHS-compliant e3 variant availability.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across a broad current range (0.25–0.68 mA typical test points) and temperature span (−65°C to +175°C). Its glass hermetic DO-35 package ensures high reliability and radiation hardness per MicroNote 050.
Electrical behavior is defined by two critical impedance metrics: ZZT = 600 Ω measured at IZK = 0.25 mA, and ZZK derived from 60 Hz AC superimposed on DC bias - ensuring sharp knee characteristics and rejection of unstable units during screening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 180 V at IZT = 0.68 mA - sets precise clamping threshold for high-voltage monitoring circuits |
| Zener Tolerance | ±5% (B suffix) - enables predictable regulation band without post-selection trimming |
| Max Zener Impedance | 600 Ω at IZK = 0.25 mA - limits voltage deviation under dynamic load transients |
| Max Reverse Current | 0.1 μA at VR = 144 V - ensures minimal standby power loss in always-on protection paths |
| Power Dissipation | 500 mW at 25°C, derated linearly above 50°C lead temperature - defines thermal layout requirements on FR4 |
| Temp. Coefficient | +0.110 %/°C - quantifies voltage drift magnitude over industrial temperature range |
| Package | DO-35 (DO-204AH) glass axial-lead - supports through-hole mounting with 0.2 g mass and 10 mm lead length standard |
Pinout & Package
Hermetically sealed DO-35 (DO-204AH) glass axial-lead package with cathode indicated by color band; operated with banded end positive relative to unbanded end for Zener regulation. Leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference node / ground return | Connected to system ground or lower-potential rail; carries reverse leakage current |
| Cathode (banded end) | Zener regulation node | Connected to protected voltage rail; maintains 180 V ±5% under specified IZK/IZT conditions |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered device | Guarantees compliance with 1N52xxB family specifications including VZ, IR, VF, ZZT, ZZK, and αVZ |
| Radiation-hardened construction | Inherently radiation hard per MicroNote 050 - suitable for aerospace and high-reliability environments |
| ESD-insensitive design | Passes MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Low capacitance | Typical CJ < 2 pF (per Figure 2) - preserves signal integrity in high-frequency voltage sensing |
| RoHS-compliant option | e3 suffix available - meets environmental compliance without performance trade-off |
Applications
| High-Voltage Power Supply Reference | Overvoltage Clamp for Telecom Line Cards |
|---|---|
Use Scenario: Stabilizing feedback divider in 200 V DC-DC converter output stage. IC Role / Device Role / Timing Role: Zener reference element providing fixed 180 V reference point for error amplifier input. Use Value: ±5% tolerance and +0.110 %/°C TC enable ±8% total drift over −40°C to +85°C ambient - sufficient for Class II industrial regulation. | Use Scenario: Protecting line interface ICs from lightning-induced surges on -48 V telecom distribution lines. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy above 180 V while limiting peak voltage seen by downstream circuitry. Use Value: 500 mW rating and 0.1 μA IR at 144 V ensure negligible standby loading and reliable turn-on during fast-rising transients. |
| Industrial Sensor Excitation Reference | Programmable Threshold Detector in PLC Input Modules |
Use Scenario: Generating stable excitation voltage for 4–20 mA loop-powered pressure transmitters requiring >150 V headroom. IC Role / Device Role / Timing Role: Precision Zener source establishing regulated bias for analog front-end op-amps. Use Value: Low 600 Ω ZZK ensures minimal voltage sag under 0.25 mA sensor bias current - maintaining accuracy within 0.1% full scale. | Use Scenario: Setting trip point for undervoltage lockout (UVLO) in 190 V DC input modules of programmable logic controllers. IC Role / Device Role / Timing Role: Voltage threshold detector triggering shutdown when input drops below 180 V × 0.95 = 171 V. Use Value: Sharp knee characteristic verified via dual-point ZZT/ZZK testing ensures repeatable activation without hysteresis or chatter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5279C/TR | ±2% Zener tolerance (C suffix) vs. ±5% (B suffix); same VZ, IZT, ZZK, and package | Required where tighter initial accuracy needed for calibration-critical references | Select 1N5279C/TR when absolute voltage accuracy dominates over cost sensitivity |
| 1N5279D/TR | ±1% Zener tolerance (D suffix); otherwise identical electrical and mechanical specs | Suitable for metrology-grade references or military screening where 1% initial tolerance is mandated | Choose 1N5279D/TR only if system-level accuracy budget demands sub-1% baseline error |
Compared with 1N5279B/TR, the C and D variants offer progressively tighter voltage tolerances (±2%, ±1%) without altering thermal resistance, impedance, or package - enabling accuracy upgrades without PCB or layout changes.
Availability
1N5279B/TR is available at Aetrix Electronics and suitable for high-voltage reference design, telecom surge protection, and industrial sensor excitation requiring stable component supply and long-term obsolescence management.
Supply support for 1N5279B/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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components.
The 1N52xxB series was designed for precision voltage regulation in harsh-environment applications including aerospace, defense, and industrial power systems where long-term stability and JEDEC-verified parametric guarantees are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5279B/TR?
The 1N5279B/TR has a nominal Zener voltage of 180 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance applies under standard test conditions (25°C, IZT = 0.68 mA) and is validated across the full operating temperature range per JEDEC registration requirements for the 1N52xxB family.
Does the 1N5279B/TR require heatsinking in typical applications?
No, the 1N5279B/TR does not require external heatsinking in standard operation because its 500 mW power rating is thermally managed via lead conduction. At 25°C ambient, it delivers full power; derating begins linearly above 50°C lead temperature (TL), reaching zero dissipation at 175°C - consistent with its DO-35 package's 250°C/W junction-to-lead thermal resistance.
Is the 1N5279B/TR RoHS compliant?
Yes, the 1N5279B/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5279B-e3/TR). The base part number without "e3" uses traditional tin-lead plating; however, RoHS-compliant matte-tin plating is available per MIL-STD-750 Method 2026 and is explicitly documented in Microsemi's datasheet revision D.
What is the maximum reverse leakage current for the 1N5279B/TR?
The 1N5279B/TR specifies a maximum reverse leakage current (IR) of 0.1 μA when tested at VR = 144 V (80% of nominal 180 V Zener voltage). This value is guaranteed across the full operating temperature range and reflects the device's suitability for ultra-low-power standby protection circuits.
Can the 1N5279B/TR be used in place of higher-power Zeners like the 1N53xx series?
No, the 1N5279B/TR is rated for 500 mW maximum power dissipation, whereas the 1N53xx series delivers up to 5 W. Substituting 1N5279B/TR in a 1N53xx footprint would cause thermal failure under equivalent load conditions. It is not a drop-in replacement - use only where 500 mW power handling and DO-35 packaging meet the design's thermal and mechanical constraints.
1N5279B/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 180 V
- Tolerance:
- ±5%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5279B/TR FAQ
1.How can I place an order for 1N5279B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5279B/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 1N5279B/TR reliable?
The price and inventory of 1N5279B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5279B/TR is usually 5 days.
3.What payment methods are accepted for 1N5279B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5279B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5279B/TR?
1N5279B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5279B/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 1N5279B/TR?
For technical support, including 1N5279B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5279B/TR requirements.
6.How does Aetrix verify that 1N5279B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5279B/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 1N5279B/TR meets industry standards.
7.What is the process for return or replacement of 1N5279B/TR?
All 1N5279B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5279B/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 1N5279B/TR part is unused and in its original packaging.
Return procedure for 1N5279B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5279B/TR Tags
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