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Microchip Technology 1N5255BUR-1
- Part No.:
- 1N5255BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5255BUR-1.pdf
- Description:
- DIODE ZENER 28V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,139
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Product details
Overview
1N5255BUR-1 from Microsemi is a 28 V, ±5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers 4.5 mA test current, 44 Ω dynamic impedance at 20 mA, and +0.091 %/°C temperature coefficient.
For engineers reviewing the 1N5255BUR-1 datasheet, 1N5255BUR-1 pinout, 1N5255BUR-1 application, or 1N5255BUR-1 equivalent, key selection criteria include Zener voltage stability across temperature, low leakage (<0.1 µA at 20 V), hermetic glass packaging for reliability, and compatibility with automated SMT assembly on FR4 boards.
Technical Context
This device operates as a reverse-biased voltage reference, maintaining 28 V regulation at IZT = 20 mA with ZZT = 44 Ω and αVZ = +0.091 %/°C. Its metallurgically bonded glass construction ensures stable junction characteristics and radiation hardness per MicroNote 050.
It exhibits minimal capacitance (~1.5 pF typical at 0 V), non-sensitive ESD behavior (MIL-STD-750 Method 1020), and thermal resistance of 250 °C/W (junction-to-ambient) when mounted on 1 oz Cu FR4 with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 28 V ±5% at 20 mA - defines precise regulation point for feedback loops and references |
| Power Dissipation PD | 0.5 W - supports continuous operation up to 20 mA at 25 °C ambient without derating |
| Dynamic Impedance ZZT | 44 Ω at 20 mA - determines output voltage variation under load transients |
| Reverse Leakage IR | <0.1 µA at 20 V - ensures negligible current draw in standby or high-impedance bias networks |
| Temp Coefficient αVZ | +0.091 %/°C - enables predictable drift compensation in temperature-stable references |
| Junction Temp Range | –65 to +175 °C - supports operation in extended industrial and aerospace environments |
| Forward Voltage VF | 1.1 V max at 200 mA - allows use as clamp or rectifier in dual-role designs |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking. No discrete pins - terminals are metallized end caps soldered directly to PCB pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode End Cap | Zener Anode Connection | Connected to circuit ground or lower potential node during regulation; banded end must be biased positive relative to anode for breakdown conduction |
| Anode End Cap | Zener Cathode Connection | Connected to regulated output node; reverse voltage applied between cathode (positive) and anode (negative) to enable Zener action |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Construction | Eliminates moisture ingress and long-term parameter drift in humid or harsh environments |
| Metallurgical Bonding | Ensures robust thermal and electrical interface between silicon die and end caps for stable RθJEC = 100 °C/W |
| MIL-PRF-19500 Screening Option | Enables qualification for military/aerospace applications via up-screened versions (e.g., MQ/MX/MV suffixes) |
| Low Capacitance | ~1.5 pF typical - preserves high-frequency signal integrity in RF bias and timing circuits |
| Radiation Hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-qualified subsystems |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 28 V reference for ADC voltage dividers, op-amp biasing, or DAC output scaling in instrumentation systems. IC Role / Device Role / Timing Role: Passive voltage reference element establishing known potential for analog signal conditioning. Use Value: Tight 5% tolerance and +0.091 %/°C TC enable <±1.5% total error over –40 to +85 °C without external trimming. | Use Scenario: Protecting microcontroller I/O pins or sensor inputs from transient surges exceeding 28 V in automotive body control modules. IC Role / Device Role / Timing Role: Reverse-biased shunt clamping device diverting excess energy to ground. Use Value: Sub-100 ns response time and 0.5 W power rating absorb 100–200 V/µs transients without degradation. |
| Current Regulator Bias | Temperature-Stable Oscillator Core |
Use Scenario: Setting constant bias current for JFET or bipolar transistor amplifiers in telecom line drivers. IC Role / Device Role / Timing Role: Series-connected Zener providing fixed voltage drop to establish emitter/base bias points. Use Value: Low 44 Ω dynamic impedance maintains current stability within ±2% over 5–25 mA load variation. | Use Scenario: Stabilizing frequency-determining node voltage in crystal oscillator circuits for industrial PLC clock generators. IC Role / Device Role / Timing Role: Voltage reference anchoring oscillator loop gain and threshold levels. Use Value: Radiation hardness and minimal capacitance prevent phase noise degradation and ensure startup reliability after ionizing events. |
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-1 | Same 28 V, ±5%, DO-35 axial package; RθJA = 300 °C/W vs. 250 °C/W for DO-213AA | Requires through-hole assembly; less suitable for high-density SMT layouts | Select 1N5255B-1 only when legacy through-hole compatibility or manual rework access is required |
| BZX55C27 | 27 V nominal, ±5%, DO-35; higher ZZT = 60 Ω; no MIL-PRF-19500 screening path | Lacks radiation hardness documentation and hermetic glass construction | Choose BZX55C27 only for cost-sensitive commercial applications where radiation tolerance and long-term stability are not critical |
Compared with 1N5255B-1 and BZX55C27, the 1N5255BUR-1 offers superior thermal performance in SMT layouts, verified radiation hardness, and hermetic reliability-making it preferred for aerospace, medical, and high-reliability industrial designs where field failure risk must be minimized.
Availability
1N5255BUR-1 is available at Aetrix Electronics and suitable for precision reference supplies, overvoltage protection circuits, and current-regulated bias networks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5255BUR-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 analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series belongs to Microsemi's legacy Zener regulator product line, engineered for applications demanding hermetic sealing, MIL-spec screening capability, and proven performance in mission-critical voltage reference and protection roles.
FAQ
What is the Zener voltage tolerance and test current for the 1N5255BUR-1?
The 1N5255BUR-1 has a nominal Zener voltage of 28 V with a ±5% tolerance, measured at a test current IZT of 20 mA. This tolerance corresponds to the "B" suffix in the part nomenclature and is guaranteed across the full operating temperature range of –65 °C to +175 °C.
Does the 1N5255BUR-1 have RoHS-compliant variants?
Yes, RoHS-compliant versions of the 1N5255BUR-1 are available with the "e3" suffix (e.g., 1N5255BUR-1e3), featuring annealed matte-tin plating on the end caps. These are offered for commercial-grade applications only and meet JEDEC J-STD-609A Class 3 requirements.
What is the maximum reverse leakage current specification for the 1N5255BUR-1?
The 1N5255BUR-1 specifies a maximum reverse leakage current IR of 0.1 µA when tested at VR = 20 V and TA = 25 °C. This ultra-low leakage supports high-impedance bias networks and precision reference applications where parasitic current paths must be minimized.
Can the 1N5255BUR-1 be used in radiation-exposed environments?
Yes, the 1N5255BUR-1 is inherently radiation-hardened per Microsemi MicroNote 050, making it suitable for low-dose-rate space and nuclear instrumentation applications. Its metallurgically bonded glass package contributes to this resilience by limiting displacement damage and charge trapping effects.
What is the thermal resistance and derating behavior of the 1N5255BUR-1?
The 1N5255BUR-1 has a junction-to-ambient thermal resistance RθJA of 250 °C/W when mounted on FR4 with 1 oz copper and the recommended footprint. Power must be derated linearly above 50 °C ambient or 125 °C end-cap temperature, reaching zero dissipation at 150 °C ambient per the published derating curve.
1N5255BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N5255BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5255BUR-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 1N5255BUR-1 reliable?
The price and inventory of 1N5255BUR-1 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 is usually 5 days.
3.What payment methods are accepted for 1N5255BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5255BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5255BUR-1?
1N5255BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5255BUR-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 1N5255BUR-1?
For technical support, including 1N5255BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5255BUR-1 requirements.
6.How does Aetrix verify that 1N5255BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5255BUR-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 1N5255BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5255BUR-1?
All 1N5255BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5255BUR-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 1N5255BUR-1 part is unused and in its original packaging.
Return procedure for 1N5255BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5255BUR-1 Tags
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