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Microchip Technology 1N5249BUR-1/TR
- Part No.:
- 1N5249BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5249BUR-1/TR.pdf
- Description:
- DIODE ZENER 19V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,143
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Product details
Overview
1N5249BUR-1/TR from Microsemi is a surface-mount 19 V, 500 mW Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 6.6 mA test current, and 23 Ω dynamic impedance at IZT; used for precision voltage regulation in power supply feedback, reference, and overvoltage protection circuits.
For engineers reviewing the 1N5249BUR-1/TR datasheet, 1N5249BUR-1/TR pinout, 1N5249BUR-1/TR application, or 1N5249BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, low dynamic impedance, hermetic glass packaging, temperature coefficient (+0.086 %/°C), and RoHS-compliant commercial-grade availability in tape-and-reel format.
Technical Context
This device operates as a reverse-biased voltage reference diode with breakdown at 19 V ±5% under 6.6 mA test current. Its metallurgically bonded glass construction ensures stable regulation across -65°C to +175°C junction temperature range and minimal capacitance per Figure 3.
Thermal resistance is 250°C/W (junction-to-ambient on FR4) and 100°C/W (junction-to-end-cap), enabling reliable 500 mW dissipation only when end-cap temperature remains below 125°C or ambient stays under 50°C - requiring careful PCB thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 19 V ±5% at 6.6 mA - defines nominal regulation point with tight tolerance suitable for feedback references. |
| Power Dissipation PD | 0.5 W - maximum steady-state power; derates linearly above 50°C ambient or 125°C end-cap temperature. |
| Dynamic Impedance ZZT | 23 Ω at IZT = 6.6 mA - low impedance ensures stable output voltage under varying load currents. |
| Temp. Coefficient αVZ | +0.086 %/°C - positive drift with temperature; critical for high-stability references across wide operating ranges. |
| Reverse Leakage IR | ≤0.1 µA at VR = 14 V - ultra-low leakage preserves accuracy in high-impedance bias networks. |
| Forward Voltage VF | ≤1.1 V at IF = 200 mA - enables use as clamp or protection diode in forward conduction mode. |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking; terminals are solderable end caps with tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to higher potential during reverse-bias operation; polarity must be observed to avoid forward conduction. |
| Anode (unbanded end) | Reference ground node | Serves as circuit common; reverse voltage applied between cathode and anode to activate regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded glass construction | Enables hermetic sealing and radiation hardness per MicroNote 050 - suitable for aerospace and industrial environments. |
| Low dynamic impedance (23 Ω) | Minimizes output voltage variation under changing load conditions - improves regulation stability in feedback loops. |
| Minimal capacitance | Typical CJ < 2 pF (per Figure 3) - preserves high-frequency response in RF biasing and fast transient suppression. |
| ESD insensitivity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly. |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 19 V threshold for error amplifier input. Use Value: ±5% tolerance and +0.086 %/°C tempco enable <±2% total output variation over -40°C to +85°C ambient. | Use Scenario: Clamps transient surges on 15–24 V DC rails in automotive body control modules and industrial PLC I/O channels. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when rail exceeds 19 V. Use Value: 0.5 W rating and low ZZT allow sustained clamping without thermal runaway under repetitive 100 ns–1 µs transients. |
| High-Stability Voltage Reference | Low-Capacitance RF Bias Network |
Use Scenario: Provides precision bias for op-amp input stages, ADC references, and sensor excitation circuits in medical instrumentation. IC Role / Device Role / Timing Role: Stable 19 V reference source with minimal drift and leakage. Use Value: ≤0.1 µA leakage at 14 V and hermetic packaging ensure long-term calibration stability and low measurement noise. | Use Scenario: Biases GaAs FET amplifiers and PIN diode switches in 50 Ω RF front-ends up to 1 GHz. IC Role / Device Role / Timing Role: DC bias injection point with minimal parasitic capacitance. Use Value: Typical junction capacitance <2 pF (per Figure 3) avoids signal attenuation and phase shift in matching networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5249B-1/TR | Same 19 V, ±5%, DO-35 axial package; higher RθJA (300°C/W), no hermetic seal. | Less suitable for high-reliability or high-temperature PCB layouts; requires through-hole mounting. | Select when board space allows axial leads and cost sensitivity outweighs thermal/radiation performance. |
| BZX55C18-TR | 18 V nominal, ±5%, DO-35; 20 mA IZT, 25 Ω ZZT, non-hermetic epoxy package. | Lower voltage and less stable tempco (+0.075%/°C); not radiation-hardened. | Choose for general-purpose 18 V regulation where MIL-spec compliance and extreme temp range are unnecessary. |
Compared with 1N5249B-1/TR and BZX55C18-TR, the 1N5249BUR-1/TR delivers superior thermal performance (RθJEC = 100°C/W), hermetic reliability, and radiation hardness - making it preferred for mission-critical analog references and harsh-environment clamping.
Availability
1N5249BUR-1/TR is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage protection clamp, and high-stability voltage reference applications requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for 1N5249BUR-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 1N52xxBUR-1 series targets precision voltage regulation in demanding environments, emphasizing hermetic packaging, radiation tolerance, and extended temperature operation - distinct from commodity Zener offerings.
FAQ
What is the Zener voltage and tolerance of the 1N5249BUR-1/TR?
The 1N5249BUR-1/TR has a nominal Zener voltage of 19 V with a tolerance of ±5% at 6.6 mA test current (IZT). This value is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0232-1 datasheet. The 1N5249BUR-1/TR achieves this specification using metallurgical bonding and hermetic glass packaging to ensure long-term stability under thermal cycling.
What package type does the 1N5249BUR-1/TR use, and is it RoHS compliant?
The 1N5249BUR-1/TR uses the DO-213AA (SOD-80/MELF) hermetically sealed glass package with cathode band marking. RoHS-compliant versions are available for commercial-grade units only, indicated by the "e3" suffix in the full part nomenclature - though the base part number 1N5249BUR-1/TR itself denotes the RoHS-compliant commercial variant per Microsemi's nomenclature guide.
What is the maximum power dissipation and thermal derating behavior of the 1N5249BUR-1/TR?
The 1N5249BUR-1/TR has a steady-state power dissipation rating of 0.5 W, valid only when the end-cap temperature remains below 125°C or ambient temperature stays under 50°C on FR4 board. Derating follows a linear curve beyond those limits, with RθJA = 250°C/W and RθJEC = 100°C/W - values measured using Microsemi's recommended footprint per the datasheet's final page.
How does the temperature coefficient of the 1N5249BUR-1/TR affect its regulation accuracy?
The 1N5249BUR-1/TR exhibits a positive temperature coefficient of +0.086 %/°C, meaning its Zener voltage increases by approximately 16.3 mV per °C rise across its 19 V nominal value. This coefficient is measured between 25°C and 125°C at rated IZT, and must be factored into total regulation error budgets for applications operating beyond room temperature - especially in unregulated power supplies or precision references.
Can the 1N5249BUR-1/TR be used in high-frequency or RF applications?
Yes - the 1N5249BUR-1/TR is suitable for RF biasing due to its minimal junction capacitance (<2 pF typical, per Figure 3 in the datasheet) and low dynamic impedance (23 Ω). Its hermetic glass package also avoids moisture-related parameter shifts. When used in RF amplifier bias networks or PIN diode drivers, the 1N5249BUR-1/TR maintains signal integrity up to ~1 GHz without introducing significant parasitic loading.
1N5249BUR-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):
- 19 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 23 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
1N5249BUR-1/TR FAQ
1.How can I place an order for 1N5249BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5249BUR-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 1N5249BUR-1/TR reliable?
The price and inventory of 1N5249BUR-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 1N5249BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5249BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5249BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5249BUR-1/TR?
1N5249BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5249BUR-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 1N5249BUR-1/TR?
For technical support, including 1N5249BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5249BUR-1/TR requirements.
6.How does Aetrix verify that 1N5249BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5249BUR-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 1N5249BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5249BUR-1/TR?
All 1N5249BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5249BUR-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 1N5249BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5249BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5249BUR-1/TR Tags
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