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Microchip Technology 1N5254BUR-1/TR
- Part No.:
- 1N5254BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5254BUR-1/TR.pdf
- Description:
- DIODE ZENER 27V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,472
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Product details
Overview
1N5254BUR-1/TR from Microsemi is a surface-mount 27 V, 500 mW Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 4.6 mA test current, and 41 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5254BUR-1/TR datasheet, 1N5254BUR-1/TR pinout, 1N5254BUR-1/TR application, or 1N5254BUR-1/TR equivalent, key selection criteria include Zener voltage stability across temperature, low leakage (<0.1 µA @ 20 V), hermetic glass packaging for reliability, and compatibility with automated SMT assembly per EIA-481-B tape-and-reel.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 27 V at 4.6 mA, exhibiting a positive temperature coefficient of +0.090 %/°C and dynamic impedance of 41 Ω - optimized for stable regulation under varying load and thermal conditions.
Its metallurgically bonded glass construction ensures hermetic sealing, radiation hardness per MicroNote 050, and ESD insensitivity (MIL-STD-750 Method 1020), supporting use in aerospace, industrial control, and high-reliability instrumentation where long-term parametric stability is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% at 4.6 mA - defines precise regulation point for feedback loops and reference rails. |
| Power Dissipation | 0.5 W - supports continuous operation up to 50°C ambient or 125°C end-cap temperature with derating. |
| Dynamic Impedance (ZZT) | 41 Ω at IZT - ensures minimal output voltage variation under changing load current. |
| Reverse Leakage (IR) | <0.1 µA at 20 V - guarantees negligible current draw in standby or high-impedance sensing nodes. |
| Temp. Coefficient (αVZ) | +0.090 %/°C - enables predictable drift compensation in wide-temperature-range designs. |
| Package | DO-213AA (SOD-80/MELF) - provides hermeticity, thermal performance (RθJEC = 100 °C/W), and MELF-style reflow compatibility. |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass package with two end-cap terminals; cathode identified by single black band - operated with banded end positive for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point in reverse bias | Applied positive voltage relative to anode to enter breakdown; determines polarity-sensitive PCB orientation. |
| Anode (unbanded end) | Zener cathode connection point in reverse bias | Reference ground or return path; must be held at lower potential than cathode during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation from –65°C to +175°C junction temperature with immunity to moisture ingress and long-term parameter drift. |
| Metallurgical bonding | Eliminates wire bonds and interfacial delamination risks, improving mechanical robustness and thermal cycling endurance. |
| Radiation hardness | Qualified per Microsemi MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications without shielding. |
| ESD insensitivity | Passes MIL-STD-750 Method 1020 - allows handling and assembly without special ESD controls in production environments. |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode providing fixed 27 V reference for optocoupler-based error amplifier input. Use Value: Maintains ±1.5% output accuracy over –40°C to +85°C ambient due to low tempco and tight tolerance. |
Use Scenario: Clamping transient surges on 24 V industrial sensor bus lines. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy above 27 V to ground before downstream ICs are damaged. Use Value: Responds within nanoseconds with <0.1 µA leakage below clamp threshold, minimizing standby power loss. |
| Instrumentation Calibration | Aerospace Voltage Monitor |
|
Use Scenario: Setting precision offset in 16-bit analog front-end for strain gauge signal conditioning. IC Role / Device Role / Timing Role: Stable 27 V reference source for DAC output scaling and ADC reference buffer biasing. Use Value: Delivers <10 ppm/°C effective drift after system-level calibration, meeting Class A metrology requirements. |
Use Scenario: Monitoring auxiliary 28 V aircraft bus voltage with fault detection logic. IC Role / Device Role / Timing Role: Primary Zener element in discrete comparator circuit detecting undervoltage/overvoltage thresholds. Use Value: Survives 100 krad(Si) TID per MicroNote 050, enabling use in avionics without additional rad-hard components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B-1TR | Same electrical specs but in axial DO-35 package; no MELF form factor or hermetic glass seal. | Lacks radiation hardness and high-temp capability; limited to commercial-grade PCBs with through-hole assembly. | Select when cost sensitivity outweighs reliability requirements and board space permits axial mounting. |
| BZX55C27 | 27 V ±5%, 500 mW, but in DO-35 plastic package; higher leakage (≤5 µA @ 20 V) and no radiation qualification. | Not suitable for aerospace or extended-temperature industrial use; requires conformal coating for humidity resistance. | Choose only for non-critical consumer applications where RoHS compliance and low unit cost are primary drivers. |
Compared with 1N5254B-1TR and BZX55C27, the 1N5254BUR-1/TR delivers superior thermal stability, hermetic reliability, and radiation tolerance - making it the sole option for mission-critical systems requiring MIL-PRF-19500 screening or operation beyond 125°C.
Availability
1N5254BUR-1/TR is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and instrumentation calibration requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5254BUR-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 aerospace-grade analog and discrete components.
The 1N5254BUR-1/TR belongs to Microsemi's legacy 1N52xxBUR-1 Zener series designed specifically for military, space, and industrial applications demanding hermetic packaging, extended temperature operation, and parametric stability under stress.
FAQ
What is the Zener voltage tolerance for 1N5254BUR-1/TR?
The 1N5254BUR-1/TR has a nominal Zener voltage of 27 V with a ±5% tolerance, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at 25°C with 4.6 mA test current and ensures regulation within 25.65 V to 28.35 V under specified conditions.
Is 1N5254BUR-1/TR RoHS compliant?
Yes, the 1N5254BUR-1/TR is RoHS compliant (e3 suffix), with annealed matte-tin plating on its end caps. RoHS compliance is available for commercial-grade versions only; military-screened variants (e.g., JAN, JANTX) are not RoHS compliant.
What is the maximum power dissipation of 1N5254BUR-1/TR?
The 1N5254BUR-1/TR has a steady-state power dissipation rating of 0.5 W. Derating is required above 50°C ambient or 125°C end-cap temperature per the published thermal curve in Figure 2 of the datasheet T4-LDS-0232-1.
Does 1N5254BUR-1/TR require special handling for ESD?
No - the 1N5254BUR-1/TR is non-sensitive to ESD per MIL-STD-750 Method 1020, eliminating the need for ESD-safe workstations or packaging during standard manufacturing handling and assembly.
Can 1N5254BUR-1/TR be used in space applications?
Yes - the 1N5254BUR-1/TR is inherently radiation hard per Microsemi MicroNote 050 and supports up-screening to MIL-PRF-19500, making it qualified for low-earth orbit and other space-grade applications where total ionizing dose resistance is required.
1N5254BUR-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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
1N5254BUR-1/TR FAQ
1.How can I place an order for 1N5254BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5254BUR-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 1N5254BUR-1/TR reliable?
The price and inventory of 1N5254BUR-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 1N5254BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5254BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5254BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5254BUR-1/TR?
1N5254BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5254BUR-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 1N5254BUR-1/TR?
For technical support, including 1N5254BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5254BUR-1/TR requirements.
6.How does Aetrix verify that 1N5254BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5254BUR-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 1N5254BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5254BUR-1/TR?
All 1N5254BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5254BUR-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 1N5254BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5254BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5254BUR-1/TR Tags
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