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Microchip Technology 1N5947BUR-1/TR
- Part No.:
- 1N5947BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5947BUR-1/TR.pdf
- Description:
- DIODE ZENER 82V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,911
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Product details
Overview
1N5947BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 82 V Zener voltage at 4.6 mA test current, with 10% tolerance, 160 Ω dynamic impedance, and maximum reverse current of 0.25 µA at 62.2 V. It serves voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5947BUR-1/TR datasheet, 1N5947BUR-1/TR pinout, 1N5947BUR-1/TR application, or 1N5947BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (RθJA = 120 °C/W), hermetic glass packaging, MIL-PRF-19500 screening eligibility, and RoHS-compliant plating options.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-bias breakdown mode, with specified knee current (IZK = 0.25 mA) and corresponding knee impedance (ZZK = 160 Ω). Its metallurgically bonded tungsten slug construction ensures low thermal resistance (RθJEC = 40 °C/W) and stable regulation across -65 °C to +175 °C junction temperature range.
The DO-213AB MELF package provides hermetic sealing, ESD immunity per MIL-STD-750 Method 1020, and inherent radiation hardness per Microsemi MicroNote 050. Capacitance is characterized versus Zener voltage (Figure 2), supporting filtering-aware design in analog and power management circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 82 V ±10% at IZT = 4.6 mA - defines nominal regulation point under standard test conditions |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - sets maximum steady-state thermal load on end cap |
| Dynamic Impedance (ZZT) | 160 Ω - determines output voltage variation under changing load current |
| Reverse Current (IR) | 0.25 µA max at VR = 62.2 V - specifies leakage level below breakdown threshold |
| Junction Temperature Range | -65 °C to +175 °C - enables operation in extended industrial and aerospace environments |
| Thermal Resistance (RθJA) | 120 °C/W on FR4 (1 oz Cu) - informs PCB layout cooling requirements |
| Forward Voltage (VF) | 1.2 V max @ 200 mA - relevant for polarity verification and surge protection use cases |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed voidless hard glass body with tungsten slugs; cathode indicated by single band; tin/lead or RoHS-compliant matte tin plating over copper; weight ≈ 0.05 g; tape-and-reel delivery (12 mm tape, EIA-481-B compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; negative terminal during Zener regulation | Connected to lower-potential node in shunt regulator configuration |
| Cathode | Negative terminal in forward bias; positive terminal during Zener regulation | Banded end; connected to higher-potential rail to enable reverse-bias breakdown regulation |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance (RθJEC = 40 °C/W) and improves long-term reliability under thermal cycling |
| Hermetically sealed glass construction | Eliminates moisture ingress and parameter drift in humid or corrosive environments |
| MIL-PRF-19500 screening option | Supports high-reliability applications requiring military-grade quality assurance and traceability |
| ESD immunity per MIL-STD-750 Method 1020 | Enables handling and assembly without external ESD protection circuitry |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for operation in moderate total ionizing dose (TID) environments |
Applications
| Industrial Power Supply Regulation | Avionics Reference Voltage |
|---|---|
Use Scenario: Stabilizing +82 V intermediate rail in isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise feedback to error amplifier. Use Value: 10% VZ tolerance and 160 Ω ZZT ensure <±1.2 V regulation window under 1–10 mA load variation. | Use Scenario: Providing primary reference for analog-to-digital conversion in flight control sensor interface. IC Role / Device Role / Timing Role: Precision voltage clamp for ADC input protection and scaling network. Use Value: Hermetic MELF package and -65 °C to +175 °C rating support operation across full aircraft environmental envelope. |
| Test Equipment Calibration Circuit | Space-Qualified Bias Network |
Use Scenario: Generating stable 82 V reference in automated test equipment (ATE) source-measure unit. IC Role / Device Role / Timing Role: Primary Zener reference in multi-decade voltage calibration chain. Use Value: Low 0.25 µA reverse leakage at 75% VZ minimizes error contribution in high-impedance reference dividers. | Use Scenario: Biasing photodiode arrays in satellite star tracker front-end. IC Role / Device Role / Timing Role: Radiation-tolerant voltage clamp protecting sensitive analog front-end nodes. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in LEO missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5947B | Same electrical specs but axial DO-41 package; no TR tape-and-reel suffix | Requires through-hole PCB assembly; unsuitable for high-density SMT layouts | Select when legacy board compatibility or manual prototyping is prioritized over automation |
| SMBG5947B | Same VZ, 5% tolerance, SMB package; RθJA = 100 °C/W; higher IZM = 18 mA | Higher power handling in smaller footprint but non-hermetic plastic package | Select when cost-sensitive commercial designs require tighter voltage tolerance and higher current capability |
Compared with 1N5947BUR-1/TR, the 1N5947B offers identical regulation performance in axial form for through-hole use, while SMBG5947B trades hermeticity and ESD immunity for tighter tolerance and better thermal performance in plastic SMT packaging-enabling trade-offs between reliability, density, and precision.
Availability
1N5947BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, avionics reference circuits, test equipment calibration modules, and space-qualified bias networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N5947BUR-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 RF solutions 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, radiation tolerance, and MIL-PRF-19500 qualification capability in harsh operating environments.
FAQ
What is the Zener voltage tolerance for 1N5947BUR-1/TR?
The 1N5947BUR-1/TR has a Zener voltage tolerance of ±10%, meaning its nominal 82 V regulation point falls within 73.8 V to 90.2 V at IZT = 4.6 mA and TEC = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0300-1 Rev. 1. The "B" in the nomenclature denotes 5% tolerance for other variants, but the "UR-1" suffix here corresponds to the 10% grade.
Is 1N5947BUR-1/TR RoHS compliant?
Yes, 1N5947BUR-1/TR is RoHS compliant. The "e3" marking designation (per Part Nomenclature section, page 2) confirms matte tin plating meeting RoHS Directive 2011/65/EU requirements. This applies to both standard and screened versions, and solderability is verified per MIL-STD-750 Method 2026.
What does the "TR" suffix mean in 1N5947BUR-1/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format supports automated SMT placement and is specified in the Mechanical and Packaging section (page 2). The base part 1N5947BUR-1 is identical electrically and mechanically; only the packaging differs.
Can 1N5947BUR-1/TR be used in high-reliability aerospace applications?
Yes, 1N5947BUR-1/TR supports high-reliability aerospace use via optional MIL-PRF-19500 screening, as stated in the Features and Maximum Ratings sections. Its hermetic DO-213AB package, metallurgically enhanced contacts, and radiation hardness per MicroNote 050 make it suitable for mission-critical systems when procured with appropriate screening levels and source control drawings.
What is the maximum Zener current (IZM) for 1N5947BUR-1/TR?
The maximum Zener current (IZM) for 1N5947BUR-1/TR is 18 mA, derived from PD = 1.5 W and VZ = 82 V (IZM = PD/VZ ≈ 18.3 mA). This value aligns with the "18" entry in the IZM column for 1N5947BUR-1 on page 3 of the datasheet, confirming safe continuous operation up to this current at rated power.
1N5947BUR-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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 160 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 62.2 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)
1N5947BUR-1/TR FAQ
1.How can I place an order for 1N5947BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5947BUR-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 1N5947BUR-1/TR reliable?
The price and inventory of 1N5947BUR-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 1N5947BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5947BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5947BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5947BUR-1/TR?
1N5947BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5947BUR-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 1N5947BUR-1/TR?
For technical support, including 1N5947BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5947BUR-1/TR requirements.
6.How does Aetrix verify that 1N5947BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5947BUR-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 1N5947BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5947BUR-1/TR?
All 1N5947BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5947BUR-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 1N5947BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5947BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5947BUR-1/TR Tags
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