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Microchip Technology 1N5249BUR-1
- Part No.:
- 1N5249BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5249BUR-1.pdf
- Description:
- DIODE ZENER 19V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,490
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Product details
Overview
1N5249BUR-1 from Microsemi is a 19 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetically sealed DO-213AA (SOD80/MLL34) MELF glass package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers 6.6 Ω dynamic impedance at 20 mA test current, operates from –65 °C to +175 °C, and exhibits +0.086 %/°C temperature coefficient.
For engineers reviewing the 1N5249BUR-1 datasheet, 1N5249BUR-1 pinout, 1N5249BUR-1 application, or 1N5249BUR-1 equivalent, key selection criteria include its 19 V nominal Zener voltage, 6.6 Ω Zener impedance at IZT, 0.1 µA max reverse leakage at 13.3 V, DO-213AA mechanical compatibility, and radiation-hardened performance per MicroNote 050.
Technical Context
This device functions as a two-terminal, reverse-biased voltage reference with a sharp breakdown knee at 19 V. Its metallurgically bonded glass construction ensures stable long-term Zener voltage drift and low capacitance (<1.5 pF typical), critical for noise-sensitive analog references and high-frequency clamp applications.
It operates within a 20 mA test current regime and supports full-rated power dissipation up to 125 °C end-cap temperature or 50 °C ambient on FR4, with thermal resistance of 100 °C/W junction-to-end-cap and 250 °C/W junction-to-ambient under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 19 V at 20 mA - defines precise regulation point for feedback loops and reference generation |
| Zener Impedance (ZZT) | 6.6 Ω at IZT = 20 mA - ensures minimal output voltage variation under load transients |
| Power Dissipation (PD) | 0.5 W - enables use in compact, low-power regulator designs without forced cooling |
| Reverse Leakage (IR) | 0.1 µA max at 13.3 V - guarantees negligible current draw in standby or high-impedance bias networks |
| Temp. Coefficient (αVZ) | +0.086 %/°C - quantifies voltage drift across industrial temperature range for stability-critical references |
| Junction Temp. Range | –65 °C to +175 °C - supports operation in aerospace, downhole, and military environments |
| Package Type | DO-213AA (SOD80/MLL34) - MELF glass body with hermetic seal and end-cap terminations |
Pinout & Package
DO-213AA (SOD80/MLL34) is a cylindrical metallurgically bonded glass MELF package with two solderable end-cap terminals. Cathode is marked by a single band; polarity must be observed with banded end positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; forms return path for Zener current in shunt regulation |
| Cathode (banded end) | Regulated output node | Provides stable 19 V reference when reverse-biased; connects to input of error amplifier or load |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass construction | Prevents moisture ingress and parameter shift over time-critical for 20+ year reliability in sealed systems |
| Metallurgical bond interface | Eliminates interfacial delamination risk under thermal cycling-ensures stable VZ in wide-temp applications |
| Radiation hardness (per MicroNote 050) | Validated for total ionizing dose (TID) resilience-enables use in space-qualified and nuclear instrumentation |
| Low capacitance (<1.5 pF typical) | Minimizes high-frequency coupling and signal distortion in RF biasing and fast-switching clamp circuits |
| MIL-PRF-19500 upscreening option | Available with MQ/MX/MV/MSP reliability levels-meets screening requirements for defense and avionics programs |
Applications
| Industrial Sensor Signal Conditioning | Aerospace Power Supply Reference |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers in factory automation PLC modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing 19 V bias to Wheatstone bridge, compensating for supply rail variation. Use Value: 6.6 Ω ZZT and +0.086 %/°C αVZ limit bridge output drift to <0.1% FS over –40 °C to +85 °C ambient. |
Use Scenario: Generating a stable 19 V reference for ADC front-end biasing in satellite telemetry subsystems. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference ensuring data converter accuracy despite TID exposure. Use Value: Hermetic DO-213AA package and MicroNote 050 qualification maintain VZ stability after 100 krad(Si) irradiation. |
| Medical Instrument Overvoltage Clamp | Telecom Line Interface Protection |
|
Use Scenario: Clamping transient spikes on ECG electrode inputs to protect downstream amplifiers from ESD events. IC Role / Device Role / Timing Role: Fast-response shunt protector limiting voltage to 19 V during 15 kV HBM ESD pulses. Use Value: 0.1 µA leakage at 13.3 V prevents DC offset errors; low capacitance avoids signal attenuation above 1 MHz. |
Use Scenario: Regulating bias voltage for optocoupler drivers in isolated DSL line cards operating at extended temperature. IC Role / Device Role / Timing Role: Low-drift 19 V reference maintaining LED forward current accuracy across –40 °C to +105 °C. Use Value: –65 °C to +175 °C junction rating and 100 °C/W RθJEC enable reliable operation without derating at high ambient. |
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 | Same 19 V VZ, ±5% tolerance, but in axial DO-35 (DO-204AH) package | Requires through-hole PCB layout and manual assembly; lacks MELF's thermal symmetry and vibration resistance | Select for legacy board rework or cost-sensitive non-military designs where SMT is not required |
| BZX55C18 | 18 V nominal VZ, ±5%, 500 mW, DO-35 package; higher ZZT (20 Ω) and wider temp coefficient (±0.09 %/°C) | Lower regulation precision and higher drift-suitable only for non-critical biasing where 1 V margin exists | Choose only if 18 V suffices and DO-35 footprint is fixed; not recommended for 19 V–specific references |
Compared with 1N5249B-1 and BZX55C18, the 1N5249BUR-1 provides superior thermal stability, lower dynamic impedance, and radiation-hardened reliability in a surface-mount MELF form factor-making it the preferred choice for high-reliability, space-constrained, or wide-temperature applications requiring exact 19 V regulation.
Availability
1N5249BUR-1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, aerospace power reference, medical ESD clamping, and telecom line interface protection requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N5249BUR-1 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-performance analog and mixed-signal components.
The 1N52xxBUR-1 series was engineered to deliver JEDEC-standard Zener performance in a robust, surface-mount MELF package for mission-critical analog reference and protection functions in defense, space, and industrial systems.
FAQ
What is the Zener voltage tolerance for 1N5249BUR-1?
The 1N5249BUR-1 has a nominal Zener voltage of 19 V with a ±5% tolerance, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This means the actual measured VZ falls between 18.05 V and 19.95 V at 20 mA test current and 25 °C ambient. The tolerance is guaranteed across the full operating temperature range.
Does 1N5249BUR-1 support MIL-PRF-19500 screening?
Yes, the 1N5249BUR-1 is eligible for up-screening per MIL-PRF-19500 when ordered with appropriate reliability level suffixes (e.g., MQ, MX, MV, MSP). The base commercial-grade 1N5249BUR-1 is not screened, but Microsemi offers these enhanced versions for defense and aerospace applications requiring tested lot traceability and environmental stress screening.
What is the maximum reverse leakage current for 1N5249BUR-1?
The 1N5249BUR-1 specifies a maximum reverse leakage current (IR) of 0.1 µA at a reverse voltage (VR) of 13.3 V and 25 °C. This ultra-low leakage ensures minimal loading on high-impedance bias networks and preserves accuracy in precision reference circuits where even nanoamp-level currents affect performance.
Can 1N5249BUR-1 be used in high-temperature environments?
Yes, the 1N5249BUR-1 is rated for junction and storage temperatures from –65 °C to +175 °C. When mounted on FR4 with the recommended footprint, it maintains full 0.5 W power dissipation up to 125 °C end-cap temperature or 50 °C ambient-making it suitable for under-hood automotive, downhole oil/gas, and industrial furnace control applications.
Is 1N5249BUR-1 RoHS compliant?
The 1N5249BUR-1 is available in both RoHS-compliant (suffix "e3") and non-RoHS versions. The RoHS-compliant variant uses annealed matte-tin plating on end caps and meets commercial-grade environmental requirements. Note that RoHS compliance is limited to commercial-grade units; screened military versions retain tin-lead plating per MIL-STD-750.
1N5249BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N5249BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5249BUR-1 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 reliable?
The price and inventory of 1N5249BUR-1 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 is usually 5 days.
3.What payment methods are accepted for 1N5249BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5249BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5249BUR-1?
1N5249BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5249BUR-1 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?
For technical support, including 1N5249BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5249BUR-1 requirements.
6.How does Aetrix verify that 1N5249BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5249BUR-1 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 meets industry standards.
7.What is the process for return or replacement of 1N5249BUR-1?
All 1N5249BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5249BUR-1, 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 part is unused and in its original packaging.
Return procedure for 1N5249BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5249BUR-1 Tags
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