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Microchip Technology 1N5918BUR-1/TR
- Part No.:
- 1N5918BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5918BUR-1/TR.pdf
- Description:
- DIODE ZENER 5.1V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
1N5918BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 5.1 V ±5% Zener voltage at 73.5 mA test current, with 4.0 Ω dynamic impedance and 5.0 µA reverse leakage at 5.0 V. It delivers stable voltage regulation in high-density power supply and reference circuits across industrial temperature range.
For engineers reviewing the 1N5918BUR-1/TR datasheet, 1N5918BUR-1/TR pinout, 1N5918BUR-1/TR application, or 1N5918BUR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (RθJA = 120 °C/W), hermetic glass construction, MIL-PRF-19500 screening availability, and RoHS-compliant matte tin plating.
Technical Context
This device operates as a precision shunt voltage regulator, maintaining 5.1 V across its terminals when reverse-biased above its breakdown knee (IZK = 1.0 mA) and within its 1.5 W steady-state power limit at TEC ≤ 115 °C. Its metallurgically bonded tungsten slug structure ensures low thermal resistance (RθJEC = 40 °C/W) and enhanced reliability under thermal cycling.
The DO-213AB MELF package provides hermetic glass sealing, non-ESD-sensitive operation per MIL-STD-750 Method 1020, and specified capacitance (see Figure 2). It is a surface-mount equivalent of the axial-leaded 1N5918B, supporting high-reliability applications requiring radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZT = 73.5 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - supports continuous regulation in compact layouts with adequate end-cap heatsinking |
| Dynamic Impedance (ZZT) | 4.0 Ω - ensures minimal output voltage variation under load current changes in feedback or clamp circuits |
| Reverse Leakage (IR) | 5.0 µA max at VR = 5.0 V - guarantees low quiescent current in standby or low-power sensing nodes |
| Thermal Resistance (RθJA) | 120 °C/W on FR4 (1 oz Cu) - determines maximum ambient temperature rise before derating begins |
| Junction Temperature Range | –65 to +175 °C - enables operation in extended industrial, aerospace, and downhole environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - confirms low-loss conduction in bidirectional protection or clamping configurations |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed voidless hard glass case 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 | Current sink in forward bias; reference node in reverse-bias regulation | Connected to lower-potential rail (e.g., ground) during Zener operation; carries full load current in shunt configuration |
| Cathode | Current source in forward bias; regulated output node in reverse bias | Banded end; connected to higher-potential rail (e.g., VIN) during regulation; maintains stable 5.1 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance (RθJEC = 40 °C/W) and improves long-term reliability under thermal stress |
| Hermetically sealed glass construction | Prevents moisture ingress and parameter drift in humid or corrosive environments |
| MIL-PRF-19500 screening option | Enables use in military/aerospace programs requiring controlled manufacturing and lot traceability |
| Non-ESD-sensitive per MIL-STD-750 Method 1020 | Eliminates need for ESD handling protocols during assembly, reducing process overhead |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for operation in moderate total ionizing dose (TID) environments |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Providing stable 5.1 V reference for linear regulators or ADC reference inputs in industrial PLC modules. IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining precise DC potential independent of input ripple or load variation. Use Value: Tight 5% tolerance and low 4.0 Ω dynamic impedance ensure reference stability within ±15 mV over 10–100 mA load range. | Use Scenario: Protecting microcontroller I/O pins from transient surges in automotive body control units. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor operating in reverse breakdown to clamp spikes above 5.1 V. Use Value: Hermetic glass package withstands repeated surge events without parameter shift; 1.5 W rating handles 8/20 µs transients up to 12 A peak. |
| High-Density Board Regulation | Radiation-Tolerant Sensor Interface |
Use Scenario: Local voltage regulation for analog front-end ICs on space-constrained medical imaging PCBs. IC Role / Device Role / Timing Role: Compact surface-mount Zener replacing larger axial devices to enable 2× board density improvement. Use Value: DO-213AB MELF footprint occupies <30% area of DO-41, enabling tighter routing and reduced parasitic inductance. | Use Scenario: Biasing photodiode amplifiers in satellite-based Earth observation sensors exposed to cosmic radiation. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference ensuring consistent amplifier gain calibration over mission lifetime. Use Value: Inherent TID tolerance per MicroNote 050 eliminates need for shielding or redundant references in LEO orbits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5918B | Axial-leaded DO-41 package; identical electrical specs but higher RθJA (150 °C/W); no tape-and-reel option | Suitable for prototyping or through-hole boards; not compatible with SMT reflow or high-density layouts | Select 1N5918B only when manual assembly or legacy board compatibility is required |
| SMBG5918B | Surface-mount SMB package; same VZ, but higher ZZT (6.0 Ω); RθJA = 100 °C/W; lower power rating (1.0 W) | Better thermal performance than MELF on large copper pours; less stable regulation due to higher impedance | Choose SMBG5918B when board space allows larger footprint and thermal management prioritizes junction-to-ambient over dynamic regulation accuracy |
Compared with 1N5918B and SMBG5918B, the 1N5918BUR-1/TR offers optimal balance of SMT compatibility, low dynamic impedance, and hermetic reliability-making it preferred for production-grade high-density, high-stability, and radiation-aware designs where DO-213AB mounting is feasible.
Availability
1N5918BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical sensor interfaces, and aerospace subsystems requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for 1N5918BUR-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 high-voltage analog components for defense, aerospace, and industrial markets.
The 1N59xxBUR series belongs to Microsemi's precision Zener diode product line, engineered for applications demanding hermetic sealing, MIL-PRF-19500 compliance, and stable voltage reference performance under extreme thermal and radiation conditions.
FAQ
What is the Zener voltage tolerance and test condition for 1N5918BUR-1/TR?
The 1N5918BUR-1/TR has a Zener voltage of 5.1 V with ±5% tolerance, measured at a test current (IZT) of 73.5 mA and end-cap temperature (TEC) of 30 °C. This tolerance ensures predictable regulation behavior in production circuits without requiring post-manufacture trimming, and the specified test condition reflects real-world thermal boundary conditions during operation.
Is 1N5918BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full part number 1N5918BUR-1/TR indicates RoHS compliance with matte tin plating over copper. The device meets EU Directive 2011/65/EU requirements and is suitable for environmentally regulated industrial and consumer applications without lead exemptions.
What does the "TR" suffix signify in 1N5918BUR-1/TR?
"TR" denotes tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format enables automated SMT placement and is required for high-volume production. The reel contains standard quantities defined by Microsemi's packaging specification, and the part remains fully traceable to lot and date code.
Can 1N5918BUR-1/TR replace axial-leaded 1N5918B in existing designs?
No direct replacement: 1N5918BUR-1/TR uses DO-213AB (MELF) while 1N5918B uses DO-41. Their footprints, thermal paths, and reflow profiles differ significantly. Migration requires PCB layout revision, pad geometry update, and validation of thermal derating curves-though electrical parameters match exactly for functional equivalence.
What is the maximum reverse current (IR) specification for 1N5918BUR-1/TR at 5.0 V?
The maximum reverse current for 1N5918BUR-1/TR is 5.0 µA at VR = 5.0 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on reference circuits and preserves accuracy in high-impedance bias networks used with op-amps or comparators.
1N5918BUR-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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)
1N5918BUR-1/TR FAQ
1.How can I place an order for 1N5918BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5918BUR-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 1N5918BUR-1/TR reliable?
The price and inventory of 1N5918BUR-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 1N5918BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5918BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5918BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5918BUR-1/TR?
1N5918BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5918BUR-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 1N5918BUR-1/TR?
For technical support, including 1N5918BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5918BUR-1/TR requirements.
6.How does Aetrix verify that 1N5918BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5918BUR-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 1N5918BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5918BUR-1/TR?
All 1N5918BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5918BUR-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 1N5918BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5918BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5918BUR-1/TR Tags
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