My Inquiry
My Account
Microchip Technology 1N5279BUR-1
- Part No.:
- 1N5279BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5279BUR-1.pdf
- Description:
- DIODE ZENER 180V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5279BUR-1 from Microsemi is a hermetically sealed, metallurgically bonded glass MELF Zener diode rated for 0.5 W regulation at 180 V nominal Zener voltage with ±5% tolerance (B-grade), 0.68 mA test current, and +0.110 %/°C temperature coefficient. It operates across –65 °C to +175 °C and serves as a precision voltage reference in high-reliability analog power supply feedback paths.
For engineers reviewing the 1N5279BUR-1 datasheet, 1N5279BUR-1 pinout, 1N5279BUR-1 application, or 1N5279BUR-1 equivalent, key selection criteria include its DO-213AA package compatibility, low leakage (<0.1 µA at 137 V), high dynamic impedance (2200 Ω at IZT), radiation-hardened construction, and MIL-PRF-19500 upscreening eligibility.
Technical Context
This device functions exclusively as a reverse-biased Zener voltage regulator, not a forward-conducting rectifier. Its breakdown behavior is characterized at 0.68 mA (IZT), with Zener impedance measured under 10% rms AC modulation superimposed on IZT - yielding 2200 Ω (ZZT) and 6000 Ω (ZZK at 0.25 mA).
Thermal design requires adherence to derating curves: full 500 mW dissipation is only valid below 50 °C ambient or 125 °C end-cap temperature; RθJA = 250 °C/W on FR4 with 1 oz Cu, and RθJEC = 100 °C/W confirms end-cap–junction thermal path dominance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 180 V ±5% at 0.68 mA - defines stable regulation point for high-voltage feedback loops |
| Power Dissipation PD | 500 mW maximum - limits continuous current to ≤2.78 mA at 180 V without derating |
| Zener Impedance ZZT | 2200 Ω at IZT - indicates moderate regulation stiffness; output voltage shifts ~1.2 V per 0.5 mA load change |
| Reverse Leakage IR | <0.1 µA at 137 V - ensures minimal error current in high-impedance reference nodes |
| Temp Coefficient αVZ | +0.110 %/°C - contributes +198 mV/°C drift; requires thermal stabilization in precision circuits |
| Junction Temp Range | –65 °C to +175 °C - supports operation in aerospace, downhole, and military environments |
| Forward Voltage VF | 1.1 V max at 200 mA - irrelevant for Zener operation but critical for ESD robustness testing |
Pinout & Package
DO-213AA (SOD-80 / MLL34) metallurgically bonded glass MELF package: cylindrical body with tin-lead or RoHS-compliant matte-tin end-cap terminations; cathode identified by single black band; polarity requires banded end to be positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse bias | Must be held at higher potential than anode to enable breakdown; connects to regulated node |
| Anode (unbanded end) | Zener cathode connection in reverse bias | Reference or ground node; carries full Zener current; layout must minimize trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; enables >20-year shelf life |
| Metallurgical bonding | Provides superior thermal transfer from junction to end caps vs. epoxy-bonded alternatives |
| MIL-PRF-19500 upscreening option | Supports qualification to Class B, S, or V levels for defense/aerospace programs |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - no additional shielding required |
| Low capacitance | Typical <1.5 pF (per Figure 3) - preserves high-frequency stability in RF bias networks |
Applications
| High-Voltage Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output of 200 V DC-DC converter in satellite power management unit. IC Role / Device Role / Timing Role: Zener reference element in TL431-based shunt regulator feedback divider. Use Value: Stable 180 V reference enables ±0.5% output regulation over –40 °C to +85 °C with <10 ppm/°C drift after thermal compensation. | Use Scenario: Providing bias voltage for radiation-hardened op-amps in Mars rover telemetry subsystem. IC Role / Device Role / Timing Role: Primary voltage reference for analog sensor signal conditioning chain. Use Value: Inherent TID hardness eliminates need for rad-hard IC-level references; DO-213AA package survives launch vibration and vacuum outgassing. |
| Downhole Instrumentation | Military Test Equipment |
Use Scenario: Voltage clamp in 175 °C logging-while-drilling (LWD) tool front-end protection circuit. IC Role / Device Role / Timing Role: Overvoltage protector for ADC input stage exposed to transient spikes. Use Value: Full-spec operation at +175 °C junction temperature allows direct placement near hot sensors; 0.1 µA leakage prevents measurement offset errors. | Use Scenario: Calibration reference in portable RF field strength meter requiring NIST-traceable stability. IC Role / Device Role / Timing Role: Secondary standard for periodic self-calibration against primary reference. Use Value: ±5% initial tolerance and <0.11%/°C TC allow two-point calibration to ±0.2% accuracy over 0–50 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5279B-1 | Same electrical specs but in axial DO-35 (DO-204AH) package; no metallurgical bond; lower thermal resistance to ambient | Suitable for prototyping or through-hole PCBs; not qualified for MIL-PRF-19500 screening | Select when board space permits axial leads and radiation hardness is not required |
| SMF180A | Surface-mount SOD-123 package; 180 V, 1 W rating; 10x lower ZZT (220 Ω); RoHS-only; no MIL screening path | Better regulation stiffness and thermal margin; limited to commercial temp range (–65 °C to +150 °C) | Select when higher power handling and tighter regulation are prioritized over radiation tolerance and extended temperature range |
Compared with 1N5279B-1 and SMF180A, the 1N5279BUR-1 uniquely combines hermetic MELF packaging, metallurgical bonding, MIL-PRF-19500 upscreening capability, and operation up to +175 °C - making it irreplaceable in mission-critical high-temperature, high-reliability systems where long-term parametric stability is non-negotiable.
Availability
1N5279BUR-1 is available at Aetrix Electronics and suitable for high-reliability power supply feedback, aerospace voltage reference, and downhole instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5279BUR-1 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, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series was designed specifically to deliver JEDEC-standard Zener performance in a hermetic, surface-mount MELF package with MIL-PRF-19500 qualification pathways - bridging legacy axial reliability with modern SMT assembly requirements.
FAQ
What is the Zener voltage tolerance for 1N5279BUR-1?
The 1N5279BUR-1 has a nominal Zener voltage of 180 V with a ±5% tolerance, indicated by the "B" suffix in the part number per Microsemi's nomenclature. This means the actual VZ falls between 171 V and 189 V when measured at 0.68 mA and 25 °C. Tighter tolerances (±2%, ±1%) are available under different suffixes but are not applicable to this specific variant.
Can 1N5279BUR-1 be used in place of the axial 1N5279B-1?
No - while 1N5279BUR-1 and 1N5279B-1 share identical electrical specifications, they differ fundamentally in package and construction. The 1N5279BUR-1 uses a hermetic DO-213AA MELF package with metallurgical bonding, whereas the 1N5279B-1 is axial DO-35 with epoxy encapsulation. They are not mechanically or thermally interchangeable; PCB footprint, reflow profile, and reliability profiles are incompatible.
Is 1N5279BUR-1 RoHS compliant?
Yes, the 1N5279BUR-1 is available in RoHS-compliant versions marked with the "e3" suffix (e.g., 1N5279BUR-1e3), featuring annealed matte-tin plating on end caps. However, RoHS compliance applies only to commercial-grade units; MIL-qualified variants retain tin-lead terminations to meet solderability and reliability requirements per MIL-STD-750.
What is the maximum reverse leakage current for 1N5279BUR-1?
The maximum reverse leakage current for 1N5279BUR-1 is 0.1 µA, specified at VR = 137 V (76% of nominal VZ) and TA = 25 °C. This ultra-low leakage ensures minimal error current in high-impedance reference circuits and supports stable operation in precision analog designs where bias current injection must be minimized.
Does 1N5279BUR-1 support MIL-PRF-19500 screening?
Yes, the 1N5279BUR-1 supports MIL-PRF-19500 upscreening - available in JAN, JANTX, JANTXV, and JANS reliability levels depending on suffix (e.g., MQ, MX, MV, MSP). Screening includes extended environmental testing, lot traceability, and failure analysis protocols required for defense and space applications; consult Microchip's official documentation for qualification reports and ordering codes.
1N5279BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5279BUR-1 FAQ
1.How can I place an order for 1N5279BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5279BUR-1 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 1N5279BUR-1 reliable?
The price and inventory of 1N5279BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5279BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5279BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5279BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5279BUR-1?
1N5279BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5279BUR-1 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 1N5279BUR-1?
For technical support, including 1N5279BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5279BUR-1 requirements.
6.How does Aetrix verify that 1N5279BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5279BUR-1 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 1N5279BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5279BUR-1?
All 1N5279BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5279BUR-1, 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 1N5279BUR-1 part is unused and in its original packaging.
Return procedure for 1N5279BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5279BUR-1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
