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Microchip Technology 1N5944BUR-1/TR
- Part No.:
- 1N5944BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5944BUR-1/TR.pdf
- Description:
- DIODE ZENER 62V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,565
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Product details
Overview
1N5944BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 62 V ±5% Zener voltage at 6.0 mA test current, with 100 Ω dynamic impedance and 1.5 µA reverse leakage at 47.1 V. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5944BUR-1/TR datasheet, 1N5944BUR-1/TR pinout, 1N5944BUR-1/TR application, or 1N5944BUR-1/TR equivalent, key selection criteria include Zener tolerance (±5%), hermetic glass packaging, MIL-PRF-19500 screening availability, low thermal resistance (RθJEC = 40 °C/W), and RoHS-compliant matte tin plating.
Technical Context
This device operates as a two-terminal voltage regulator in reverse breakdown mode, with specified knee current (IZK = 0.25 mA) and regulated impedance (ZZT = 100 Ω at IZT = 6.0 mA). Its metallurgically bonded tungsten slug construction ensures low thermal resistance and enhanced reliability under thermal cycling.
The DO-213AB MELF package provides hermetic sealing, ESD immunity per MIL-STD-750 Method 1020, and capacitance of ~34 pF (typical at 62 V), making it suitable for noise-sensitive analog references and aerospace-grade power conditioning where parasitic inductance must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62 V ±5% at IZT = 6.0 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in compact thermal environments with proper end-cap heatsinking |
| Dynamic Impedance (ZZT) | 100 Ω at IZT = 6.0 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 1.5 µA max at VR = 47.1 V - ensures minimal quiescent current in standby-mode circuits |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended-temperature industrial and avionics systems |
| Thermal Resistance (RθJEC) | 40 °C/W - allows direct thermal path to PCB copper or metal heatsink via end caps |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - relevant for polarity-check and functional test during production |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical hermetically sealed body with metallurgically bonded tungsten slugs at both ends; cathode indicated by single black band; leadless, symmetric terminals; weight ≈ 0.05 g; dimensions: BD = 2.39–2.67 mm, BL = 4.80–5.21 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias; grounded node in Zener regulation | Must connect to lower-potential rail when used as shunt regulator; solderable per MIL-STD-750 Method 2026 |
| Cathode (banded end) | Current exit terminal in forward bias; regulated output node in Zener mode | Connected to voltage rail being stabilized; polarity reversal causes catastrophic failure |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgically enhanced internal contacts | Reduces interfacial thermal resistance and improves power cycling endurance beyond standard MELF diodes |
| MIL-PRF-19500 screening option | Enables use in defense and space applications requiring lot traceability, burn-in, and parametric testing |
| RoHS-compliant matte tin plating | Ensures reliable solder wetting and compatibility with lead-free reflow profiles (260 °C, 10 s) |
| Low parasitic capacitance (34 pF) | Minimizes high-frequency coupling in RF bias networks and fast-switching power supply feedback paths |
Applications
| Industrial Power Supply Reference | Aerospace DC-DC Converter Feedback |
|---|---|
Use Scenario: Precision voltage reference for isolated flyback controller ICs in 24–48 V industrial SMPS. IC Role / Device Role / Timing Role: Shunt regulator providing stable 62 V reference to optocoupler input or TL431-like comparator. Use Value: Maintains ±0.5% output regulation across –40 °C to +105 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Overvoltage clamp and reference in radiation-tolerant DC-DC modules for satellite bus regulation. IC Role / Device Role / Timing Role: Zener element in redundant voltage monitor circuit protecting FPGA power domains. Use Value: Inherent radiation hardness (per MicroNote 050) and MIL-PRF-19500 screening enable TID > 100 krad(Si) operation. |
| Test Equipment Calibration Circuit | Automotive ECU Sensor Bias Network |
Use Scenario: Fixed-voltage source in portable multimeter reference divider chains and DMM auto-ranging logic. IC Role / Device Role / Timing Role: Stable 62 V node for ADC reference scaling and analog front-end gain calibration. Use Value: 5% tolerance and <100 ppm/°C tempco ensure calibration accuracy over multiple thermal cycles without recalibration. |
Use Scenario: Bias voltage generator for Hall-effect crankshaft position sensors in engine control units. IC Role / Device Role / Timing Role: Provides regulated excitation voltage to sensor bridge while rejecting battery ripple. Use Value: Low 1.5 µA leakage at 47.1 V prevents loading of high-impedance sensor outputs and preserves signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5944B-TR | Same electrical specs but non-RoHS, SnPb plating; no "UR" metallurgical bond enhancement | Limited to commercial-grade industrial equipment; not qualified for aerospace or medical use | Select only if legacy SnPb assembly required and radiation/military screening unnecessary |
| SMBG5944B-E3/52 | Same VZ, but SMB package (larger footprint, higher RθJA = 150 °C/W); RoHS-compliant | Lower power density; less suitable for ultra-compact layouts or high-reliability hermetic requirements | Choose when board space permits and DO-213AB handling limitations (e.g., pick-and-place yield) are a concern |
Compared with 1N5944BUR-1/TR, the 1N5944B-TR lacks hermetic sealing and radiation tolerance, while SMBG5944B-E3/52 trades MELF's low parasitics and thermal performance for easier assembly-making the original optimal for high-density, high-reliability, or radiation-hardened designs.
Availability
1N5944BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace DC-DC converters, and test equipment calibration circuits requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 1N5944BUR-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, radiation-hardened, and aerospace-grade components.
The 1N5944BUR-1/TR belongs to Microsemi's metallurgically bonded MELF Zener series, engineered for mission-critical voltage regulation where hermeticity, thermal robustness, and parametric stability outweigh cost or assembly convenience.
FAQ
What is the Zener voltage tolerance for 1N5944BUR-1/TR?
The 1N5944BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 62 V at IZT = 6.0 mA and TEC = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0300-1 datasheet and applies to all units within the UR-1 screening level.
Is 1N5944BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full part number 1N5944BUR-1/TR indicates RoHS compliance with matte tin plating. The device meets JEDEC J-STD-609A Class 3 requirements and is compatible with lead-free reflow profiles up to 260 °C for 10 seconds, as verified in the Mechanical and Packaging section of the datasheet.
Can 1N5944BUR-1/TR be used in place of axial 1N5944B?
Yes, the 1N5944BUR-1/TR is the surface-mount MELF equivalent of the axial-leaded 1N5944B, sharing identical electrical characteristics including 62 V Zener voltage, 100 Ω dynamic impedance, and 1.5 µA leakage. However, its DO-213AB package requires different PCB layout and reflow profile versus DO-41.
What is the maximum steady-state power dissipation for 1N5944BUR-1/TR?
The 1N5944BUR-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 25 °C ambient on FR4 with recommended footprint, derated power is 1.25 W, per the Maximum Ratings table on page 1 of the datasheet.
Does 1N5944BUR-1/TR support MIL-PRF-19500 screening?
Yes, the "UR" prefix in 1N5944BUR-1/TR denotes metallurgically bonded construction qualified for optional MIL-PRF-19500 screening, including temperature cycling, burn-in, and parametric testing. Screening details and ordering codes are defined in the Part Nomenclature section of the datasheet.
1N5944BUR-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):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 47.1 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)
1N5944BUR-1/TR FAQ
1.How can I place an order for 1N5944BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5944BUR-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 1N5944BUR-1/TR reliable?
The price and inventory of 1N5944BUR-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 1N5944BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5944BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5944BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5944BUR-1/TR?
1N5944BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5944BUR-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 1N5944BUR-1/TR?
For technical support, including 1N5944BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5944BUR-1/TR requirements.
6.How does Aetrix verify that 1N5944BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5944BUR-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 1N5944BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5944BUR-1/TR?
All 1N5944BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5944BUR-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 1N5944BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5944BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5944BUR-1/TR Tags
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