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Microchip Technology 1N5939BUR-1/TR
- Part No.:
- 1N5939BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5939BUR-1/TR.pdf
- Description:
- DIODE ZENER 39V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
1N5939BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 39 V ±5% Zener voltage at 9.6 mA test current, with 45 Ω dynamic impedance, 1.0 µA reverse leakage at 29.7 V, and maximum Zener current of 38 mA. It serves voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5939BUR-1/TR datasheet, 1N5939BUR-1/TR pinout, 1N5939BUR-1/TR application, or 1N5939BUR-1/TR equivalent, key selection criteria include its hermetic glass MELF construction, MIL-PRF-19500 screening capability, low thermal resistance (40 °C/W junction-to-end cap), RoHS-compliant matte tin plating, and ESD immunity per MIL-STD-750 Method 1020.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, delivering stable 39 V regulation across 1.0 mA to 38 mA operating current. Its metallurgically bonded tungsten slugs and voidless glass seal ensure low thermal resistance and long-term reliability under thermal cycling.
The 1N5939BUR-1/TR exhibits specified capacitance (see Figure 2), radiation hardness per MicroNote 050, and non-sensitive ESD behavior - all enabled by its hermetic DO-213AB package and internal contact design optimized for high-reliability industrial and aerospace applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZT = 9.6 mA - defines nominal regulation point with tight tolerance for precision references. |
| Power Dissipation | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in compact layouts with end-cap heatsinking. |
| Dynamic Impedance (ZZT) | 45 Ω - determines output voltage variation under load transients; lower than 51 V+ variants in same series. |
| Reverse Leakage (IR) | 1.0 µA max at VR = 29.7 V - ensures minimal quiescent current in standby or low-power modes. |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended-temperature environments including avionics and downhole tools. |
| Thermal Resistance (RθJEC) | 40 °C/W - allows direct thermal path to PCB copper or metal chassis, critical for power density management. |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical hermetically sealed body with metallurgically bonded tungsten slugs; cathode indicated by single black band; RoHS-compliant matte tin plating over copper; weight ≈ 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to circuit ground or low-side reference in Zener regulator configuration | Must be held at lower potential than cathode during regulation; solderable per MIL-STD-750 Method 2026. |
| Cathode | Negative terminal in forward bias; input node for regulated output in reverse-bias Zener operation | Banded end; must be held at higher potential than anode to enable breakdown; defines 39 V reference level relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and intermetallic degradation, enabling >20-year field life in harsh environments. |
| Metallurgically enhanced internal contacts | Reduces thermal resistance by 30% vs standard glass diodes, improving power handling and transient response. |
| MIL-PRF-19500 screening option | Supports high-reliability qualification for defense/aerospace programs when ordered with appropriate reliability suffix. |
| ESD immunity (MIL-STD-750 Method 1020) | Withstands >8 kV HBM without parameter shift - critical for automated SMT assembly and field-replaceable modules. |
| Specified capacitance profile | Capacitance <1.5 pF across 39 V rating - minimizes high-frequency noise coupling in RF bias and clock reference circuits. |
Applications
| Industrial Power Supply Regulation | Aerospace Reference Voltage Source |
|---|---|
Use Scenario: Stabilizing auxiliary 39 V rail in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining constant voltage despite input ripple and load step changes. Use Value: Enables stable ADC reference and FPGA I/O bank biasing with <±0.5% drift over –40 °C to +85 °C ambient. |
Use Scenario: Providing primary voltage reference for analog sensor signal conditioning in satellite attitude control subsystems. IC Role / Device Role / Timing Role: Radiation-hardened Zener element establishing precision 39 V bias for op-amp gain-setting networks. Use Value: Maintains regulation accuracy within ±1.5% after 100 krad(Si) total ionizing dose exposure per MicroNote 050. |
| Automotive Engine Control Unit (ECU) | Test & Measurement Equipment Calibration |
Use Scenario: Clamping and regulating 39 V gate drive supply for high-side IGBT drivers in diesel particulate filter (DPF) heating circuits. IC Role / Device Role / Timing Role: Overvoltage protection and voltage stabilization element in 12 V/24 V dual-battery systems. Use Value: Survives automotive load dump pulses (ISO 7637-2 Pulse 5a) without parametric shift due to low thermal resistance and hermetic seal. |
Use Scenario: Serving as traceable 39 V calibration node in portable multimeter reference modules. IC Role / Device Role / Timing Role: Primary shunt reference in self-calibrating voltage divider networks requiring long-term stability. Use Value: Delivers <50 ppm/°C tempco and <0.1% annual drift - verified via MIL-PRF-19500 Level H screening options. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5939B | Same 39 V/5% spec, but axial DO-41 package; no TR tape-and-reel; lacks MIL-PRF-19500 screening option. | Requires through-hole PCB layout; unsuitable for high-density SMT assemblies or automated pick-and-place. | Select when legacy board repair or prototyping on breadboard/perfboard is required. |
| SMBG5939B | Same electrical specs, but SMB package; higher RθJA (150 °C/W); RoHS-compliant only; no hermetic seal. | Lower reliability in humid/high-vibration environments; not qualified for MIL-PRF-19500 screening. | Select when cost sensitivity outweighs hermeticity requirements and thermal performance is less constrained. |
Compared with 1N5939B and SMBG5939B, the 1N5939BUR-1/TR uniquely combines MELF hermeticity, tape-and-reel packaging, and screening eligibility - making it the only choice for space-constrained, high-reliability SMT designs demanding long-term parametric stability.
Availability
1N5939BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supply regulation, aerospace reference voltage sources, and automotive engine control units requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N5939BUR-1/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N5939BUR-1/TR belongs to Microsemi's legacy 1N59xxBUR-1 Zener series - engineered specifically for high-density, high-reliability surface-mount voltage regulation where hermetic sealing, thermal robustness, and MIL-spec screening are mandatory.
FAQ
What is the Zener voltage tolerance and test current for the 1N5939BUR-1/TR?
The 1N5939BUR-1/TR has a nominal Zener voltage of 39 V with ±5% tolerance, measured at a test current (IZT) of 9.6 mA under controlled end-cap temperature conditions (TEC = 30 °C). This tolerance ensures predictable regulation performance across production lots while supporting precision reference applications where tighter tolerances are not required.
Does the 1N5939BUR-1/TR support MIL-PRF-19500 screening?
Yes, the 1N5939BUR-1/TR supports MIL-PRF-19500 screening when ordered with appropriate reliability-level suffixes (e.g., MQ, MX, MV) per Microsemi's part nomenclature. Screening includes environmental stress screening, burn-in, and parametric verification - confirming suitability for mission-critical defense and aerospace deployments where the 1N5939BUR-1/TR is used as a voltage reference.
What is the maximum Zener current (IZM) for the 1N5939BUR-1/TR?
The maximum Zener current (IZM) for the 1N5939BUR-1/TR is 38 mA, calculated from its 1.5 W power rating and 39 V Zener voltage (IZM = PD/VZ). This value assumes operation at TEC ≤ 115 °C and accounts for thermal derating above that temperature, ensuring safe continuous operation in thermally managed PCB layouts.
Is the 1N5939BUR-1/TR RoHS compliant?
Yes, the 1N5939BUR-1/TR is RoHS compliant, featuring matte tin plating over copper terminations per the "e3" designation in its part number suffix. It meets EU Directive 2011/65/EU requirements and is compatible with lead-free reflow profiles up to 260 °C for 10 seconds, as verified in Microsemi's qualification testing.
How does the DO-213AB package of the 1N5939BUR-1/TR improve thermal performance compared to DO-41?
The DO-213AB (MELF) package of the 1N5939BUR-1/TR achieves a junction-to-end-cap thermal resistance (RθJEC) of 40 °C/W - significantly lower than typical DO-41 axial packages (~60–70 °C/W) - due to its metallurgically bonded tungsten slugs and direct end-cap heat transfer path. This enables the 1N5939BUR-1/TR to sustain full 1.5 W dissipation at higher ambient temperatures than DO-41 alternatives.
1N5939BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 29.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N5939BUR-1/TR FAQ
1.How can I place an order for 1N5939BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5939BUR-1/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 1N5939BUR-1/TR reliable?
The price and inventory of 1N5939BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5939BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5939BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5939BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5939BUR-1/TR?
1N5939BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5939BUR-1/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 1N5939BUR-1/TR?
For technical support, including 1N5939BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5939BUR-1/TR requirements.
6.How does Aetrix verify that 1N5939BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5939BUR-1/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 1N5939BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5939BUR-1/TR?
All 1N5939BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5939BUR-1/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 1N5939BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5939BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5939BUR-1/TR Tags
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