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Microchip Technology 1N5255BUR-1/TR
- Part No.:
- 1N5255BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5255BUR-1/TR.pdf
- Description:
- DIODE ZENER 28V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,797
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Product details
Overview
1N5255BUR-1/TR from Microsemi is a surface-mount 28 V, 500 mW Zener diode in DO-213AA (SOD-80/MELF) package with ±5% tolerance, 4.5 mA test current, and 44 Ω dynamic impedance at IZT; used for precision voltage regulation in power supply feedback, reference, and overvoltage protection circuits.
For engineers reviewing the 1N5255BUR-1/TR datasheet, 1N5255BUR-1/TR pinout, 1N5255BUR-1/TR application, or 1N5255BUR-1/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant packaging, and direct alternatives for voltage reference design validation and BOM optimization.
Technical Context
This Zener operates in reverse breakdown with a nominal VZ of 28 V at IZT = 4.5 mA, exhibiting +0.091 %/°C temperature coefficient and 600 Ω maximum Zener impedance at IZK = 0.25 mA. Its metallurgically bonded glass construction ensures hermetic sealing and radiation hardness per MicroNote 050.
Designed for stable regulation across -65 °C to +175 °C junction temperature range, it delivers ≤0.1 µA reverse leakage at VR = 21 V and supports 260 °C solder reflow per MIL-STD-750 method 2026. Thermal resistance is 100 °C/W junction-to-end cap and 250 °C/W junction-to-ambient on FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 28 V ±5% at 4.5 mA - defines precise regulation point for feedback loops and references. |
| Power Dissipation PD | 0.5 W - limits continuous DC power handling; requires thermal derating above 50 °C ambient. |
| Dynamic Impedance ZZT | 44 Ω at IZT = 4.5 mA - determines output voltage stability under load variation. |
| Reverse Leakage IR | ≤0.1 µA at VR = 21 V - ensures minimal error current in high-impedance reference nodes. |
| Temp. Coefficient αVZ | +0.091 %/°C - quantifies VZ drift with temperature; critical for wide-temp applications. |
| Junction Temp. Range | -65 °C to +175 °C - enables operation in aerospace, industrial, and downhole environments. |
| Package | DO-213AA (SOD-80/MELF) - hermetically sealed glass, RoHS-compliant matte-tin end caps. |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass package with two end-cap terminals; cathode indicated by black band; polarity: banded end positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; forms low-impedance return path for Zener current. |
| Cathode (banded end) | Regulated output node | Provides stable 28 V reference when reverse-biased; connects to feedback divider or load. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables hermetic sealing and radiation hardness per MicroNote 050 - suitable for space-grade designs. |
| Minimal capacitance | Typical <1.5 pF - preserves high-frequency stability in RF bias and fast-switching regulator feedback paths. |
| ESD insensitivity | Non-sensitive per MIL-STD-750 method 1020 - eliminates need for external ESD protection in board layout. |
| Tight thermal resistance control | RθJEC = 100 °C/W - allows accurate end-cap temperature monitoring for real-time power derating. |
| RoHS-compliant plating | Matte-tin end caps (e3 suffix) - meets commercial-grade environmental compliance without solderability trade-offs. |
Applications
| Power Supply Feedback | Industrial Reference Source |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing stable 28 V threshold to TL431 or optocoupler LED anode. Use Value: Tight 44 Ω ZZT minimizes output voltage deviation under line/load transients. |
Use Scenario: Generating fixed 28 V reference for analog sensor excitation or ADC bias in PLC modules. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost IC references where 0.5% tolerance suffices. Use Value: +0.091 %/°C tempco enables <±1.5% total drift over -40 °C to +85 °C operating range. |
| Overvoltage Clamp | Aerospace Voltage Monitor |
Use Scenario: Protecting microcontroller I/O pins from transient surges in 24 V automotive subsystems. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to 28 V before damage threshold of 30 V-rated GPIO. Use Value: ≤0.1 µA leakage at 21 V prevents signal distortion in high-impedance sensing lines. |
Use Scenario: Monitoring bus voltage in satellite power distribution units requiring radiation-tolerant components. IC Role / Device Role / Timing Role: Radiation-hardened shunt reference verifying 28 V rail integrity in LEO missions. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5255B-1TR | Same 28 V, 5% tolerance, but in axial DO-35 package - no MELF form factor or hermetic seal. | Lacks radiation hardness and minimal capacitance; unsuitable for space or high-frequency feedback. | Select only when through-hole assembly or legacy footprint compatibility is required. |
| BZX55C27-TR | 27 V ±5%, 500 mW, DO-35 - 1 V lower VZ, higher ZZT (60 Ω), non-radiation-hardened. | Not rated for >125 °C junction or radiation environments; leakage >1 µA at 20 V. | Acceptable for cost-sensitive commercial power supplies where 27 V suffices and tempco is less critical. |
Compared with 1N5255BUR-1/TR, the 1N5255B-1TR sacrifices hermeticity and radiation tolerance for through-hole compatibility, while BZX55C27-TR trades 1 V lower regulation and higher impedance for broader distributor availability - neither matches the MELF package's thermal performance or space qualification.
Availability
1N5255BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage monitors, and automotive overvoltage clamps requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 1N5255BUR-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.
The 1N5255BUR-1/TR belongs to Microsemi's legacy 1N52xxBUR-1 Zener family, designed for precision voltage regulation in mission-critical aerospace, defense, and industrial systems demanding hermetic packaging and extended temperature operation.
FAQ
What is the Zener voltage tolerance and test current for the 1N5255BUR-1/TR?
The 1N5255BUR-1/TR has a nominal Zener voltage of 28 V with ±5% tolerance, measured at a test current IZT of 4.5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the T4-LDS-0232-1 datasheet, and the "B" in the part number explicitly denotes the 5% grade. The 1N5255BUR-1/TR maintains this specification across its full operating temperature range when properly derated.
Is the 1N5255BUR-1/TR RoHS compliant?
Yes, the 1N5255BUR-1/TR is RoHS compliant, indicated by the "e3" suffix in its full nomenclature (1N5255BUR-1/TR e3). Per the datasheet, RoHS-compliant versions use annealed matte-tin plating on the end caps and are available for commercial-grade devices only. This compliance meets EU Directive 2011/65/EU requirements without compromising solderability.
What is the maximum reverse leakage current for the 1N5255BUR-1/TR, and at what voltage is it specified?
The 1N5255BUR-1/TR exhibits a maximum reverse leakage current IR of 0.1 µA, specified at a reverse voltage VR of 21 V. This value is listed in the Electrical Characteristics table on page 3 and reflects the device's low-leakage performance critical for high-impedance reference applications. It remains stable up to the full -65 °C to +175 °C junction temperature range.
Does the 1N5255BUR-1/TR have radiation hardness certification?
Yes, the 1N5255BUR-1/TR possesses inherent radiation hardness per Microsemi MicroNote 050, a documented qualification based on its metallurgically bonded glass construction and process controls. While not a formal MIL-PRF-19500 screened part, its radiation tolerance is validated for total ionizing dose (TID) environments typical of low-earth orbit applications - a key differentiator versus standard commercial Zeners.
What is the thermal resistance and derating behavior of the 1N5255BUR-1/TR?
The 1N5255BUR-1/TR has a junction-to-end cap thermal resistance RθJEC of 100 °C/W and junction-to-ambient RθJA of 250 °C/W when mounted on FR4 with 1 oz copper. Its steady-state power dissipation must be derated linearly above 50 °C ambient (or 125 °C end cap), reaching zero at 175 °C junction - detailed in Figure 2 of the datasheet. This enables precise thermal modeling in compact layouts.
1N5255BUR-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):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 44 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
1N5255BUR-1/TR FAQ
1.How can I place an order for 1N5255BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5255BUR-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 1N5255BUR-1/TR reliable?
The price and inventory of 1N5255BUR-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 1N5255BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5255BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5255BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5255BUR-1/TR?
1N5255BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5255BUR-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 1N5255BUR-1/TR?
For technical support, including 1N5255BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5255BUR-1/TR requirements.
6.How does Aetrix verify that 1N5255BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5255BUR-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 1N5255BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5255BUR-1/TR?
All 1N5255BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5255BUR-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 1N5255BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5255BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5255BUR-1/TR Tags
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