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Microchip Technology 1N5943BUR-1/TR
- Part No.:
- 1N5943BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5943BUR-1/TR.pdf
- Description:
- DIODE ZENER 56V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,496
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Product details
Overview
1N5943BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 56 V ±5% Zener voltage at 6.7 mA test current, with 86 Ω dynamic impedance and 1.2 V forward voltage at 200 mA. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits across industrial temperature range.
For engineers reviewing the 1N5943BUR-1/TR datasheet, 1N5943BUR-1/TR pinout, 1N5943BUR-1/TR application, or 1N5943BUR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (RθJA = 120 °C/W), hermetic glass packaging, MIL-PRF-19500 screening availability, and RoHS-compliant termination options.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with specified knee current (IZK = 0.25 mA) and regulated impedance (ZZK = 86 Ω) near the breakdown threshold. Its metallurgically bonded tungsten slug construction ensures low thermal resistance (RθJEC = 40 °C/W) and enhanced reliability under thermal cycling.
The DO-213AB MELF package enables high-density SMT placement while maintaining hermeticity and ESD immunity per MIL-STD-750 Method 1020. Capacitance is characterized versus Zener voltage (Figure 2), supporting noise-sensitive analog reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% at IZT = 6.7 mA - defines nominal regulation point with tight tolerance for precision references. |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in thermally constrained PCB layouts. |
| Dynamic Impedance (ZZT) | 86 Ω at IZT = 6.7 mA - determines output voltage variation under load current changes. |
| Junction Temperature Range | –65 to +175 °C - enables deployment in extended-temperature industrial and aerospace environments. |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - confirms low-loss conduction during transient forward events or polarity protection use. |
| Reverse Leakage (IR) | 1.0 µA max @ VR = 42.6 V - ensures minimal quiescent current in high-impedance bias networks. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; grounded or low-side reference node in Zener regulation | Connected to system ground or lower-potential rail when used as shunt regulator. |
| Cathode | Negative terminal in forward bias; regulated output node in Zener mode | Banded end - connected to input voltage source; maintains stable 56 V at load under varying current. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance (RθJEC = 40 °C/W) and improves long-term stability under thermal stress. |
| Hermetically sealed glass construction | Prevents moisture ingress and parameter drift in humid or corrosive environments; supports MIL-PRF-19500 screening. |
| RoHS-compliant termination | Matte tin plating meets lead-free assembly requirements without compromising solderability or intermetallic formation. |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board-level design. |
Applications
| Industrial Power Supply Reference | Automotive Engine Control Unit (ECU) Biasing |
|---|---|
Use Scenario: Providing stable 56 V reference for feedback loop of isolated DC-DC converter in programmable logic controller (PLC) power module. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise error amplifier reference voltage. Use Value: Tight 5% VZ tolerance and low ZZT ensure <±1.2% output regulation across 10–100 mA load range. |
Use Scenario: Generating fixed bias voltage for sensor signal conditioning circuitry in diesel engine ECU exposed to –40 to +125 °C ambient. IC Role / Device Role / Timing Role: Precision Zener reference for op-amp input stage powering oxygen sensor interface. Use Value: Hermetic glass package and –65 to +175 °C TJ rating prevent parameter shift under thermal shock and vibration. |
| Aerospace Avionics Voltage Clamp | Test & Measurement Equipment Calibration |
Use Scenario: Overvoltage clamp protecting ADC input of flight data recorder during 28 V aircraft bus transients. IC Role / Device Role / Timing Role: Transient voltage suppressor operating in regulated breakdown during surge events. Use Value: Low RθJEC (40 °C/W) and 1.5 W PD enable reliable energy absorption without thermal runaway. |
Use Scenario: Primary voltage reference in portable multimeter calibration circuit requiring traceable 56 V standard. IC Role / Device Role / Timing Role: Stable Zener element in ratiometric reference divider network. Use Value: Specified capacitance vs. VZ (Figure 2) allows predictable frequency response in AC-coupled reference paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5943B | Axial-leaded DO-41 package; identical electrical specs but higher RθJA (150 °C/W) and no MELF mechanical robustness. | Suitable for through-hole prototyping or legacy board rework; not recommended for high-vibration or high-density SMT. | Select 1N5943B only when DO-41 footprint compatibility or manual assembly is required. |
| SMBG5943B | Surface-mount SMB package; same VZ, but higher ZZT (100 Ω) and lower PD (1.0 W); non-hermetic epoxy body. | Acceptable for cost-sensitive consumer-grade supplies where hermeticity and radiation hardness are not required. | Choose SMBG5943B for volume production on standard SMT lines where MIL-PRF-19500 compliance is unnecessary. |
Compared with 1N5943B and SMBG5943B, the 1N5943BUR-1/TR uniquely combines MELF mechanical ruggedness, hermetic glass sealing, MIL-PRF-19500 screening option, and lowest thermal resistance among 56 V Zeners in its family - making it optimal for high-reliability, high-density, and extended-temperature deployments.
Availability
1N5943BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, aerospace avionics, and test equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for 1N5943BUR-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 hermeticity, radiation hardness, and MIL-PRF-19500 qualification - particularly in mission-critical power regulation and reference functions.
FAQ
What is the Zener voltage tolerance for 1N5943BUR-1/TR?
The 1N5943BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 56 V at IZT = 6.7 mA and TEC = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the T4-LDS-0300-1 datasheet and applies to all units marked with the "B" tolerance suffix in the part nomenclature.
Is 1N5943BUR-1/TR RoHS compliant?
Yes, the "TR" suffix in 1N5943BUR-1/TR indicates tape-and-reel packaging, and the "e3" designation in the full nomenclature (e.g., 1N5943BUR-1(e3)) confirms RoHS compliance with matte tin plating. The datasheet explicitly states RoHS-compliant versions are available and specifies solderability per MIL-STD-750 Method 2026.
Can 1N5943BUR-1/TR be used in high-reliability military applications?
Yes - the 1N5943BUR-1/TR supports screening per MIL-PRF-19500, as noted in the Features section and Part Nomenclature guide. Its hermetic glass package, metallurgically bonded construction, and –65 to +175 °C junction temperature range make it suitable for source control drawing (SCD)-driven military and aerospace programs.
What is the maximum steady-state power dissipation for 1N5943BUR-1/TR?
The 1N5943BUR-1/TR has a steady-state power dissipation (PD) 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, PD is derated to 1.25 W - values confirmed in the Maximum Ratings table on page 1 of the datasheet.
Does 1N5943BUR-1/TR have specified capacitance?
Yes - Figure 2 in the datasheet plots capacitance versus Zener voltage for the entire 1N5913BUR-1 to 1N5956BUR-1 series. While an exact value for 1N5943BUR-1/TR is not tabulated, the curve shows ~15–20 pF for 56 V devices, enabling use in low-noise analog reference and timing circuits where parasitic capacitance must be bounded.
1N5943BUR-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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 86 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 42.6 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)
1N5943BUR-1/TR FAQ
1.How can I place an order for 1N5943BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5943BUR-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 1N5943BUR-1/TR reliable?
The price and inventory of 1N5943BUR-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 1N5943BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5943BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5943BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5943BUR-1/TR?
1N5943BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5943BUR-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 1N5943BUR-1/TR?
For technical support, including 1N5943BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5943BUR-1/TR requirements.
6.How does Aetrix verify that 1N5943BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5943BUR-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 1N5943BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5943BUR-1/TR?
All 1N5943BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5943BUR-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 1N5943BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5943BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5943BUR-1/TR Tags
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