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Microchip Technology 1N5931BUR-1/TR
- Part No.:
- 1N5931BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5931BUR-1/TR.pdf
- Description:
- DIODE ZENER 18V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,112
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Product details
Overview
1N5931BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 18 V ±5% Zener voltage at 20.8 mA test current, with 12 Ω dynamic impedance, 0.25 mA knee current, and 650 µA reverse leakage at 13.7 V. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5931BUR-1/TR datasheet, 1N5931BUR-1/TR pinout, 1N5931BUR-1/TR application, or 1N5931BUR-1/TR equivalent, key selection criteria include Zener tolerance (±5%), hermetic glass packaging, MIL-PRF-19500 screening compatibility, low thermal resistance (40 °C/W junction-to-end cap), and RoHS-compliant matte tin plating.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with specified Zener voltage defined at 20.8 mA (IZT) and knee behavior characterized at 0.25 mA (IZK). 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 inherent radiation hardness per MicroNote 050. Capacitance is specified across the Zener voltage range (see Figure 2), supporting stable performance in noise-sensitive analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% at IZT = 20.8 mA - defines nominal regulation point with tight tolerance for precision references |
| Power Dissipation | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in thermally constrained SMT layouts |
| Dynamic Impedance (ZZT) | 12 Ω at IZT - ensures minimal output voltage variation under load current changes |
| Knee Current (IZK) | 0.25 mA - enables usable regulation down to ultra-low standby currents |
| Reverse Leakage (IR) | 650 µA at VR = 13.7 V - quantifies off-state conduction affecting low-power bias networks |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended industrial and aerospace environments |
| Thermal Resistance (RθJEC) | 40 °C/W - allows direct end-cap heatsinking for improved power handling |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed voidless hard glass body with tungsten slugs; cathode indicated by single 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 lower potential in Zener regulation | Required for proper polarity during voltage clamping - reverse connection prevents regulation |
| Cathode | Negative terminal in forward bias; banded end, connected to higher potential in Zener regulation | Applied voltage must exceed VZ at cathode relative to anode to enter breakdown and regulate |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance and improves long-term stability under power cycling |
| Hermetic glass encapsulation | Prevents moisture ingress and parameter drift in humid or corrosive environments |
| MIL-PRF-19500 screening option | Enables use in defense and space applications requiring qualified high-reliability components |
| ESD immunity (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection in handling and assembly of sensitive systems |
| Low capacitance profile | Minimizes signal coupling and phase shift in RF bias and timing reference circuits |
Applications
| Industrial Power Supply Regulation | Avionics Reference Voltage |
|---|---|
Use Scenario: Stabilizing +15 V rail in programmable logic controller (PLC) I/O modules with wide ambient temperature swings. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining precise DC output despite input ripple and load transients. Use Value: 18 V ±5% regulation with 12 Ω ZZT ensures <±0.1 V output deviation across 5–30 mA load range. | Use Scenario: Providing stable bias for analog-to-digital converter (ADC) reference buffers in flight control computers. IC Role / Device Role / Timing Role: Low-noise, radiation-hardened voltage reference source operating from –55 °C to +125 °C. Use Value: Hermetic DO-213AB package and MIL-PRF-19500 screening ensure parameter stability under ionizing radiation and thermal shock. |
| Test Equipment Calibration Circuit | Medical Imaging Bias Network |
Use Scenario: Generating traceable 18 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Precision Zener element in temperature-compensated reference ladder networks. Use Value: 0.25 mA IZK enables regulation at microamp-level quiescent currents, extending battery life in handheld tools. | Use Scenario: Biasing photodiode amplifier stages in X-ray detector front-ends requiring ultra-low leakage. IC Role / Device Role / Timing Role: Low-leakage shunt regulator supplying clean bias to high-gain transimpedance amplifiers. Use Value: 650 µA IR at 13.7 V minimizes error current injection into sensitive analog signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5931B | Same electrical specs but axial DO-41 package; no tape-and-reel (TR) option; non-RoHS default | Through-hole assembly only; unsuitable for automated SMT lines or high-density PCBs | Select when legacy through-hole design or manual prototyping requires axial form factor |
| SMBG5931B | Same VZ/IZT/ZZT but SMB package; higher RθJA (150 °C/W); 1.0 W rating at TA=25°C | Lower power capability in still-air; requires larger pad area; less suitable for high-reliability hermetic needs | Select when board space permits larger footprint and MIL-PRF-19500 screening is not required |
Compared with 1N5931B and SMBG5931B, the 1N5931BUR-1/TR uniquely combines SMT-compatible DO-213AB packaging, RoHS compliance, tape-and-reel delivery, and hermetic reliability-making it optimal for automated production of ruggedized industrial and aerospace electronics.
Availability
1N5931BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, avionics reference circuits, medical imaging bias networks, and test equipment calibration requiring stable component supply and full traceability.
Supply support for 1N5931BUR-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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N59xxBUR-1 series belongs to Microsemi's high-stability Zener diode product line, engineered specifically for applications demanding hermetic sealing, radiation tolerance, and MIL-PRF-19500 qualification capability.
FAQ
What is the Zener voltage tolerance for 1N5931BUR-1/TR?
The 1N5931BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 18 V at 20.8 mA test current (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0300-1 datasheet. The "B" in the part nomenclature denotes the 5% tolerance grade, and this value remains valid across the full operating temperature range when used within derated power limits.
Is 1N5931BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full designation 1N5931BUR-1/TR indicates RoHS compliance per Microsemi's part nomenclature guide. The device uses matte tin plating over copper terminals and meets EU Directive 2011/65/EU requirements. This is explicitly stated in the Mechanical and Packaging section (page 2) and confirmed in the PART NOMENCLATURE table.
What does the "TR" suffix mean in 1N5931BUR-1/TR?
The "TR" suffix in 1N5931BUR-1/TR denotes tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format enables automated pick-and-place assembly. The datasheet confirms TR is the standard option for surface-mount variants and specifies reel quantities are determined by factory consultation - critical for SMT production planning and JIT inventory control.
Can 1N5931BUR-1/TR be used in radiation-exposed environments?
Yes, the 1N5931BUR-1/TR is inherently radiation hard as documented in Microsemi MicroNote 050. Its hermetic DO-213AB glass package and metallurgically bonded tungsten slug structure provide proven resilience against total ionizing dose (TID) effects. This makes the 1N5931BUR-1/TR suitable for satellite power systems and nuclear instrumentation where commercial-grade Zeners would degrade.
What is the maximum steady-state power dissipation for 1N5931BUR-1/TR?
The 1N5931BUR-1/TR has a steady-state power dissipation (PD) of 1.5 W when the end cap temperature (TEC) is maintained at ≤115 °C, and 1.25 W at TA = 25 °C on FR4 board with 1 oz copper. These values are listed in the Maximum Ratings table (page 1) and reflect thermal limits imposed by the DO-213AB package's 40 °C/W junction-to-end-cap resistance - essential for thermal design validation.
1N5931BUR-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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 12 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 13.7 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)
1N5931BUR-1/TR FAQ
1.How can I place an order for 1N5931BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5931BUR-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 1N5931BUR-1/TR reliable?
The price and inventory of 1N5931BUR-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 1N5931BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5931BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5931BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5931BUR-1/TR?
1N5931BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5931BUR-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 1N5931BUR-1/TR?
For technical support, including 1N5931BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5931BUR-1/TR requirements.
6.How does Aetrix verify that 1N5931BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5931BUR-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 1N5931BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5931BUR-1/TR?
All 1N5931BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5931BUR-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 1N5931BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5931BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5931BUR-1/TR Tags
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