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Microchip Technology 1N4579/TR
- Part No.:
- 1N4579/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4579/TR.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
1N4579/TR from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 2.0 mA test current, 0.0005 %/°C temperature coefficient, 50 Ω dynamic impedance, and ±5% nominal voltage tolerance. It delivers ultra-stable voltage reference performance in high-reliability instrumentation and precision analog circuits operating from –65°C to +175°C.
For engineers reviewing the 1N4579/TR datasheet, 1N4579/TR pinout, 1N4579/TR application, or 1N4579/TR equivalent, key selection criteria include its low TC (0.0005 %/°C), hermetic DO-7 packaging, MIL-PRF-19500/452 qualification readiness, and compatibility with tape-and-reel (TR) automated assembly.
Technical Context
This device belongs to Microsemi's zero-temperature-coefficient Zener family optimized for minimal drift across wide temperature ranges. Its 6.4 V nominal Zener voltage leverages silicon bandgap compensation to achieve TC as low as 0.0005 %/°C over –55°C to +100°C.
It operates at 2.0 mA Zener test current (IZT), delivering 50 Ω dynamic impedance (ZZT) and <2.0 µA reverse leakage at 3 V. The DO-7 package supports hermetic sealing, tin-lead solderable leads, and polarity marking via cathode band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% - stable reference point for precision analog circuitry requiring tight DC biasing |
| Temperature Coefficient (αVZ) | 0.0005 %/°C - enables sub-0.1 mV/°C drift over –55°C to +100°C operating range |
| Zener Test Current (IZT) | 2.0 mA - optimal bias point for achieving specified VZ and minimum ZZT |
| Dynamic Impedance (ZZT) | 50 Ω @ IZT - ensures low AC noise coupling and stable regulation under varying load conditions |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - confirms low leakage for high-impedance reference node integrity |
| Power Dissipation | 500 mW @ TL = 25°C - supports robust thermal margin in sealed or conduction-cooled enclosures |
| Operating Temperature | –65°C to +175°C - qualified for aerospace, downhole, and military systems with extreme environmental demands |
Pinout & Package
Package: DO-7 (DO-204AA), hermetically sealed glass case with axial leads, cathode indicated by band, tin-lead plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground reference terminal | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener voltage output terminal | Banded end; supplies regulated 6.4 V when biased at 2.0 mA with proper heat sinking |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | 0.0005 %/°C enables <±0.3 mV total drift over –55°C to +100°C without external compensation |
| Hermetic DO-7 packaging | Ensures long-term parameter stability and immunity to humidity-induced degradation in harsh environments |
| MIL-PRF-19500/452 qualification path | Add JAN/JANTX/JANTXV prefix + "-1" suffix (e.g., JANTX1N4579A-1) for screened military-grade versions |
| Tape-and-reel compatibility | "TR" suffix denotes EIA-296 compliant packaging for automated SMT placement despite axial-leaded form factor |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - eliminates need for special handling during board assembly |
Applications
| High-Precision ADC Reference | Aerospace Power Supply Monitoring |
|---|---|
Use Scenario: Providing stable reference voltage for 16-bit+ successive-approximation ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Primary voltage reference source for analog-to-digital conversion accuracy. Use Value: 0.0005 %/°C TC and 50 Ω ZZT minimize code-width variation and integral nonlinearity across temperature. |
Use Scenario: Monitoring regulated bus voltages in satellite power distribution units exposed to thermal cycling. IC Role / Device Role / Timing Role: Precision voltage sense element feeding fault-detection comparators. Use Value: Hermetic DO-7 construction and –65°C to +175°C rating ensure reliability during orbital thermal vacuum cycles. |
| Downhole Oilfield Instrumentation | Military Fire Control Systems |
Use Scenario: Biasing sensor front-ends in borehole logging tools operating at >150°C ambient. IC Role / Device Role / Timing Role: Stable excitation reference for strain-gauge and RTD signal conditioning. Use Value: Specified operation up to +175°C and low TC maintain calibration integrity without active ovenization. |
Use Scenario: Generating reference thresholds for analog comparator-based weapon arming logic. IC Role / Device Role / Timing Role: Trusted voltage threshold generator in safety-critical analog decision paths. Use Value: MIL-PRF-19500/452 qualification path and radiation-hardened variants (RH prefix) support Type I/II reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A/TR | Same 6.4 V / 0.0005 %/°C / 2.0 mA spec, but A-suffix indicates tighter initial VZ tolerance (±1% vs ±5%) | Preferred where absolute accuracy at 25°C is prioritized over cost; same thermal stability and package | Select 1N4574A/TR when system calibration budget requires <±64 mV initial error at room temperature |
| 1N4579A/TR | A-suffix denotes ±1% VZ tolerance; otherwise identical electrical specs, package, and qualification path | Used in programs requiring tighter lot-to-lot consistency without changing layout or thermal design | Choose 1N4579A/TR when upgrading from standard 1N4579/TR to reduce post-calibration trim effort |
Compared with 1N4579/TR, 1N4574A/TR offers superior initial accuracy while retaining identical temperature stability and packaging; 1N4579A/TR provides the same accuracy upgrade within the same base part number family, simplifying BOM management.
Availability
1N4579/TR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power monitoring, and downhole oilfield electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4579/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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4579/TR belongs to Microsemi's legacy Scottsdale Division zero-TC Zener reference diode family, engineered specifically for precision voltage referencing in mission-critical systems where thermal drift must be minimized without active compensation.
FAQ
What is the Zener test current for 1N4579/TR?
The 1N4579/TR is characterized at a Zener test current (IZT) of 2.0 mA. This current level is required to achieve the specified 6.4 V nominal Zener voltage and 50 Ω dynamic impedance. Operating significantly above or below this current increases voltage deviation and impedance, degrading reference stability. Always verify bias network compliance with this IZT requirement when designing with the 1N4579/TR.
Does 1N4579/TR have military qualification?
The 1N4579/TR itself is a commercial-grade part, but it supports direct qualification to MIL-PRF-19500/452 by adding appropriate prefixes and suffixes: e.g., JANTX1N4579A-1. These variants undergo screening per military standards and retain identical electrical specs and DO-7 packaging. The base 1N4579/TR serves as the foundation for all qualified versions.
What does the "TR" suffix mean on 1N4579/TR?
The "TR" suffix on 1N4579/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly despite its axial-leaded DO-7 form factor. This configuration supports high-volume manufacturing while preserving the hermetic glass package and electrical performance of the 1N4579/TR. Reel quantities and orientation are defined in the Microsemi packaging specification.
How does the temperature coefficient of 1N4579/TR compare to standard Zeners?
The 1N4579/TR achieves a temperature coefficient of 0.0005 %/°C - over 100× lower than typical 5.6 V Zeners (~0.06 %/°C) and 20× lower than basic 6.2 V references (~0.01 %/°C). This ultra-low TC results from proprietary silicon bandgap compensation, making the 1N4579/TR suitable for applications where voltage drift must remain below ±0.3 mV across –55°C to +100°C.
Can 1N4579/TR be used in surface-mount designs?
No - the 1N4579/TR uses a DO-7 (DO-204AA) axial-leaded glass package and is not a surface-mount device. For SMT-compatible equivalents, Microsemi offers military-qualified DO-213AA variants (e.g., JANTX1N4569AUR-1) with UR-1 suffix. These share identical electrical specs but require different footprint and reflow profiles. The 1N4579/TR must be mounted through-hole or adapted via lead-forming fixtures.
1N4579/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N4579/TR FAQ
1.How can I place an order for 1N4579/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4579/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 1N4579/TR reliable?
The price and inventory of 1N4579/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4579/TR is usually 5 days.
3.What payment methods are accepted for 1N4579/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4579/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4579/TR?
1N4579/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4579/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 1N4579/TR?
For technical support, including 1N4579/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4579/TR requirements.
6.How does Aetrix verify that 1N4579/TR is sourced from the original manufacturer or authorized distributors?
All 1N4579/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 1N4579/TR meets industry standards.
7.What is the process for return or replacement of 1N4579/TR?
All 1N4579/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4579/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 1N4579/TR part is unused and in its original packaging.
Return procedure for 1N4579/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4579/TR Tags
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