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Microchip Technology 1N5942BUR-1/TR
- Part No.:
- 1N5942BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5942BUR-1/TR.pdf
- Description:
- DIODE ZENER 51V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,760
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Product details
Overview
1N5942BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 51 V Zener voltage at 7.3 mA test current, with 100 Ω dynamic impedance, 1.0 µA reverse leakage at 38.8 V, and -65 °C to +175 °C operating temperature range. It serves as a precision voltage reference and regulation device in high-density power supply feedback loops.
For engineers reviewing the 1N5942BUR-1/TR datasheet, 1N5942BUR-1/TR pinout, 1N5942BUR-1/TR application, or 1N5942BUR-1/TR equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (40 °C/W junction-to-end cap), hermetic glass construction, MIL-PRF-19500 screening availability, and RoHS-compliant matte tin plating.
Technical Context
This device operates in reverse breakdown to maintain stable voltage across wide current (1.0–38.8 mA) and temperature (-65 °C to +175 °C) ranges. Its metallurgically bonded tungsten slug and voidless hard glass envelope ensure low thermal resistance (RθJEC = 40 °C/W) and radiation hardness per MicroNote 050.
It exhibits 100 Ω dynamic impedance (ZZT) at IZT = 7.3 mA and 1.0 µA reverse leakage (IR) at VR = 38.8 V - critical for low-noise regulation in analog power rails and precision reference circuits where stability under thermal stress is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at IZT = 7.3 mA - defines nominal regulation point for feedback networks. |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in compact thermally constrained layouts. |
| Dynamic Impedance (ZZT) | 100 Ω - determines output voltage variation under load transients in regulated supplies. |
| Reverse Leakage (IR) | 1.0 µA @ VR = 38.8 V - ensures minimal quiescent current loss in high-impedance bias networks. |
| Junction Temperature Range | -65 °C to +175 °C - enables use in aerospace, downhole, and industrial environments with extreme thermal cycling. |
| Thermal Resistance (RθJEC) | 40 °C/W - allows direct thermal coupling to heatsinking end caps for improved power handling reliability. |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed cylindrical 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 during forward conduction; negative terminal during Zener regulation | Connected to lower-potential node in shunt regulator configuration; requires PCB pad layout per recommended footprint (A = 7.00 mm, B = 1.8 mm). |
| Cathode | Negative terminal during forward conduction; positive terminal during Zener regulation | Banded end - must be biased at higher potential than anode to activate breakdown; serves as regulated output reference node. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift - critical for mission-critical voltage references. |
| Metallurgically enhanced internal contacts | Reduces thermal resistance by >30% vs standard wire-bonded Zeners - improves power derating performance. |
| MIL-PRF-19500 screening option | Enables qualification for defense/aerospace applications requiring controlled lot traceability and burn-in testing. |
| ESD immunity (MIL-STD-750 Method 1020) | Withstands >8 kV HBM without parameter shift - simplifies handling in automated SMT lines. |
| Specified capacitance profile | Capacitance <1.5 pF below 50 V - preserves high-frequency stability in RF bias and fast-switching regulator feedback paths. |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Shunt regulation in isolated DC-DC converter secondary-side feedback loop with optocoupler interface. IC Role / Device Role / Timing Role: Precision voltage reference establishing 51 V setpoint for error amplifier input. Use Value: Stable 51 V Zener voltage with <100 ppm/°C TC and 100 Ω ZZT minimizes output voltage drift across -40 °C to +105 °C ambient. |
Use Scenario: Primary voltage reference in radiation-tolerant avionics power management unit. IC Role / Device Role / Timing Role: Hermetic, radiation-hardened shunt regulator providing fault-tolerant 51 V rail for FPGA configuration circuitry. Use Value: Inherent radiation hardness (MicroNote 050) and MIL-PRF-19500 screening enable operation in total ionizing dose >100 krad(Si) environments. |
| Downhole Sensor Biasing | High-Density Telecom PSU |
Use Scenario: Bias voltage generation for piezoresistive pressure transducers in oil/gas wellhead monitoring systems. IC Role / Device Role / Timing Role: High-temperature-stable Zener supplying 51 V excitation to sensor bridge. Use Value: Guaranteed operation to +175 °C with <1.0 µA leakage at 38.8 V ensures minimal self-heating and measurement offset in sealed housings. |
Use Scenario: Compact shunt clamp protecting 48 V intermediate bus against overvoltage in blade server power modules. IC Role / Device Role / Timing Role: Fast-response overvoltage protection element placed directly across bus rails. Use Value: Low parasitic capacitance (<1.5 pF) and leadless MELF geometry minimize signal integrity impact during transient clamping events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5942B | Same electrical specs but axial DO-41 package; no tape-and-reel (TR) suffix; non-surface-mount | Requires through-hole assembly; unsuitable for high-density SMT designs | Select when legacy board rework or manual prototyping demands axial form factor. |
| SMBG5942B | Same VZ, IZT, ZZT; SMB package (plastic, tabbed); RθJA = 100 °C/W (vs 120 °C/W for DO-213AB) | Higher thermal resistance limits power handling in confined spaces; less hermetic than glass MELF | Select when cost-sensitive commercial telecom applications tolerate reduced reliability and radiation margin. |
Compared with 1N5942BUR-1/TR, the 1N5942B lacks surface-mount compatibility and tape-and-reel packaging, while SMBG5942B trades hermeticity and thermal performance for lower cost and plastic-package manufacturability - making the original optimal for high-reliability, high-density, and high-temperature deployments.
Availability
1N5942BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, downhole sensor biasing, and high-density telecom PSU applications requiring stable component supply, full traceability, and extended temperature support.
Supply support for 1N5942BUR-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 aerospace, defense, and industrial markets.
The 1N59xxBUR-1 series belongs to Microsemi's precision Zener diode product line, engineered for applications demanding hermetic sealing, MIL-spec screening, and stable voltage regulation under extreme thermal and radiation stress.
FAQ
What is the Zener voltage tolerance for 1N5942BUR-1/TR?
The 1N5942BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 51 V at IZT = 7.3 mA and TEC = 30 °C. This tolerance is achieved via post-process binning and is documented in the Electrical Characteristics table on page 3 of the T4-LDS-0300-1 datasheet. The 1N5942BUR-1/TR maintains this accuracy across its full operating temperature range.
Is 1N5942BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full part number 1N5942BUR-1/TR indicates RoHS compliance per EU Directive 2011/65/EU. The device uses matte tin plating over copper terminations and meets JEDEC J-STD-609A Class 3 requirements. Non-RoHS versions omit the "e3" designation and use SnPb plating.
What does the "TR" suffix mean in 1N5942BUR-1/TR?
The "TR" suffix denotes tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format enables automated pick-and-place assembly. The 1N5942BUR-1/TR is supplied in reels containing standard quantities (e.g., 3,000 units/reel), with sprocket holes and cover tape conforming to industry SMT placement equipment requirements.
Can 1N5942BUR-1/TR replace axial 1N5942B in existing designs?
No - the 1N5942BUR-1/TR uses DO-213AB (MELF) surface-mount packaging, while the 1N5942B uses DO-41 axial-leaded packaging. They share identical electrical specifications but require different PCB footprints and assembly processes. Direct replacement would necessitate layout revision and requalification per IPC-A-610.
What is the maximum steady-state power dissipation for 1N5942BUR-1/TR?
The 1N5942BUR-1/TR has a steady-state power dissipation rating of 1.5 W when the end cap temperature (TEC) is maintained at ≤115 °C. At TA = 25 °C on FR4 with 1 oz Cu, the rating drops to 1.25 W due to higher thermal resistance to ambient (RθJA = 120 °C/W). Derating curves are provided in Figure 1 of the datasheet.
1N5942BUR-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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 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)
1N5942BUR-1/TR FAQ
1.How can I place an order for 1N5942BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5942BUR-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 1N5942BUR-1/TR reliable?
The price and inventory of 1N5942BUR-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 1N5942BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5942BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5942BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5942BUR-1/TR?
1N5942BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5942BUR-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 1N5942BUR-1/TR?
For technical support, including 1N5942BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5942BUR-1/TR requirements.
6.How does Aetrix verify that 1N5942BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5942BUR-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 1N5942BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5942BUR-1/TR?
All 1N5942BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5942BUR-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 1N5942BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5942BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5942BUR-1/TR Tags
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