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Microchip Technology 1N5248BUR-1/TR
- Part No.:
- 1N5248BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5248BUR-1/TR.pdf
- Description:
- DIODE ZENER 18V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,199
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Product details
Overview
1N5248BUR-1/TR from Microsemi is a surface-mount 18 V, 500 mW Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 7.0 Ω dynamic impedance at 20 mA, and temperature coefficient of +0.085 %/°C - used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5248BUR-1/TR datasheet, 1N5248BUR-1/TR pinout, 1N5248BUR-1/TR application, or 1N5248BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, low dynamic impedance, hermetic glass packaging for reliability, and compatibility with automated SMT assembly under RoHS-compliant reflow profiles.
Technical Context
This device operates as a reverse-biased voltage reference, maintaining stable 18 V regulation across 0.25–7.0 mA test current range with minimal capacitance (<1.5 pF typical) and low leakage (<0.1 µA at 13.3 V). Its metallurgically bonded glass construction ensures thermal stability from –65 °C to +175 °C.
The 1N5248BUR-1/TR exhibits a positive temperature coefficient (+0.085 %/°C), making it suitable for temperature-compensated references when paired with negative-TC components. It meets MIL-PRF-19500 screening options and supports tape-and-reel delivery (TR suffix) per EIA-481-B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% at 20 mA - defines nominal regulation point for feedback networks and analog references. |
| Power Dissipation (PD) | 0.5 W - limits continuous Zener current to ~27.8 mA at 18 V; requires derating above 50 °C ambient. |
| Dynamic Impedance (ZZT) | 7.0 Ω at IZT = 20 mA - ensures tight voltage regulation under varying load conditions. |
| Reverse Leakage (IR) | <0.1 µA at 13.3 V - minimizes error current in high-impedance reference paths. |
| Temp. Coefficient (αVZ) | +0.085 %/°C - enables predictable drift compensation in precision analog designs. |
| Junction Temp. Range | –65 °C to +175 °C - supports operation in extended industrial and aerospace environments. |
| Forward Voltage (VF) | 1.1 V max at 200 mA - allows use as low-drop rectifier or clamp in dual-role circuits. |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking. End-cap terminals are solderable per MIL-STD-750 Method 2026; no discrete pins - device functions as two-terminal bilateral component.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse bias | Must be held at higher potential than anode to enable breakdown regulation at 18 V. |
| Anode (unbanded end) | Zener cathode connection in reverse bias | Reference ground or return path; polarity reversal blocks conduction below 1.1 V forward drop. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded glass construction | Enables hermetic sealing and superior thermal cycling reliability vs. epoxy-packaged Zeners. |
| Low dynamic impedance (7.0 Ω) | Reduces output voltage variation under load transients in regulated power supplies. |
| Minimal junction capacitance (<1.5 pF) | Preserves high-frequency stability in RF biasing and fast-switching reference applications. |
| MIL-PRF-19500 up-screening availability | Supports qualification for military/aerospace programs requiring enhanced reliability screening. |
| RoHS-compliant (e3 suffix) option | Meets lead-free assembly requirements without sacrificing glass-package robustness. |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference sets precise 18 V threshold for TL431-like comparator action in secondary-side control. Use Value: Tight 5% tolerance and 7.0 Ω impedance ensure <±1% output regulation across line/load/temperature. |
Use Scenario: Provides stable excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Two-terminal passive reference source replacing active IC references where ultra-low noise is non-critical. Use Value: –65 °C to +175 °C operating range and radiation-hardened behavior support long-term field deployment. |
| Programmable Logic Controller I/O Protection | Test Equipment Calibration Reference |
Use Scenario: Clamps transient overvoltage on 24 V digital input channels during ESD events or inductive switching. IC Role / Device Role / Timing Role: Fast-acting shunt limiter absorbing surge energy while limiting voltage to 18 V + VF. Use Value: Non-sensitive to ESD (MIL-STD-750 Method 1020) and low capacitance prevent signal distortion on high-speed inputs. |
Use Scenario: Serves as traceable 18 V calibration node in bench multimeters and automated test fixtures. IC Role / Device Role / Timing Role: Passive voltage standard referenced against NIST-traceable sources during periodic verification. Use Value: Hermetic glass package ensures long-term parameter stability (<0.1 % drift/year) required for metrology-grade tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5248B-1 | Axial DO-35 package; identical electrical specs but not surface-mount compatible. | Requires through-hole PCB layout and manual/automated axial insertion; unsuitable for dense SMT boards. | Select only when legacy board design mandates axial form factor or hand-soldering is preferred. |
| BZX55C18 | 5% tolerance, 500 mW, DO-35 - same VZ but epoxy package; higher ZZT (20 Ω) and wider temp range (–65 °C to +175 °C). | Lower reliability in high-humidity or radiation-prone environments due to non-hermetic construction. | Acceptable for commercial-grade cost-sensitive designs where hermeticity and low ZZT are not critical. |
Compared with 1N5248B-1 and BZX55C18, the 1N5248BUR-1/TR delivers superior SMT manufacturability, lower dynamic impedance, and hermetic reliability - making it optimal for space-constrained, high-reliability industrial and aerospace power regulation.
Availability
1N5248BUR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and programmable logic controller I/O protection requiring stable component supply and consistent Zener voltage performance.
Supply support for 1N5248BUR-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 1N52xxBUR-1 series was designed to deliver JEDEC-standard Zener performance in hermetic surface-mount packages for applications demanding long-term stability, radiation tolerance, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5248BUR-1/TR?
The 1N5248BUR-1/TR has a nominal Zener voltage of 18 V with a tolerance of ±5%, as indicated by the "B" in the part number suffix per Microsemi's nomenclature. This tolerance is guaranteed at 20 mA test current and 25 °C ambient temperature, and applies across the full operating temperature range with predictable drift governed by its +0.085 %/°C temperature coefficient.
Is the 1N5248BUR-1/TR RoHS compliant?
Yes, the 1N5248BUR-1/TR is RoHS compliant (lead-free) as confirmed by the "e3" designation in its full part number variant and documented in Microsemi's T4-LDS-0232-1 datasheet. RoHS compliance applies to commercial-grade versions only and covers terminal plating and packaging materials per EU Directive 2011/65/EU.
What package type does the 1N5248BUR-1/TR use?
The 1N5248BUR-1/TR uses the DO-213AA package - also known as SOD-80 or MELF - a hermetically sealed glass cylindrical surface-mount package with metallurgically bonded end caps. Its dimensions are 1.60–1.70 mm diameter and 3.30–3.70 mm length, optimized for automated pick-and-place and reflow soldering.
Can the 1N5248BUR-1/TR replace the through-hole 1N5248B-1 in existing designs?
No direct replacement is possible without PCB redesign: the 1N5248BUR-1/TR uses DO-213AA surface-mount packaging, whereas the 1N5248B-1 uses axial DO-35 leads. Layout, thermal relief, and assembly process differ fundamentally. Migration requires footprint revision, stencil design update, and validation of thermal performance under SMT reflow conditions.
What is the maximum reverse leakage current for the 1N5248BUR-1/TR?
The maximum reverse leakage current for the 1N5248BUR-1/TR is 0.1 µA at a reverse voltage of 13.3 V (75% of nominal VZ), as specified in the Electrical Characteristics table on page 3 of the T4-LDS-0232-1 datasheet. This low leakage supports high-impedance reference nodes and minimizes error in precision analog circuits using the 1N5248BUR-1/TR.
1N5248BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5248BUR-1/TR FAQ
1.How can I place an order for 1N5248BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5248BUR-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 1N5248BUR-1/TR reliable?
The price and inventory of 1N5248BUR-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 1N5248BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5248BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5248BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5248BUR-1/TR?
1N5248BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5248BUR-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 1N5248BUR-1/TR?
For technical support, including 1N5248BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5248BUR-1/TR requirements.
6.How does Aetrix verify that 1N5248BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5248BUR-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 1N5248BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5248BUR-1/TR?
All 1N5248BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5248BUR-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 1N5248BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5248BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5248BUR-1/TR Tags
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