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Microchip Technology 1N5256BUR-1/TR
- Part No.:
- 1N5256BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5256BUR-1/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
1N5256BUR-1/TR from Microsemi is a 30 V, 5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MELF) package, designed for precision voltage regulation in power supply feedback, reference, and overvoltage protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N5256BUR-1/TR datasheet, 1N5256BUR-1/TR pinout, 1N5256BUR-1/TR application, or 1N5256BUR-1/TR equivalent, key selection criteria include Zener voltage (30 V), dynamic impedance (49 Ω @ 4.2 mA), temperature coefficient (+0.091 %/°C), and hermetic glass MELF packaging for stable operation from –65 °C to +175 °C.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 30 V at 4.2 mA test current, exhibiting 49 Ω dynamic impedance (ZZT) and <0.1 µA reverse leakage at 22 V. Its metallurgically bonded glass construction ensures low capacitance and radiation hardness per MicroNote 050.
The 1N5256BUR-1/TR is rated for 0.5 W steady-state dissipation with thermal resistance junction-to-ambient of 250 °C/W on FR4 board, and features a cathode band marking for unambiguous polarity identification in high-reliability layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V ±5% at 4.2 mA - defines precise regulation point for feedback loops and voltage references |
| Power Dissipation (PD) | 0.5 W - supports compact, thermally constrained PCB designs without forced cooling |
| Dynamic Impedance (ZZT) | 49 Ω @ IZT = 4.2 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | <0.1 µA @ 22 V - enables low-power standby regulation with negligible quiescent current penalty |
| Temp. Coefficient (αVZ) | +0.091 %/°C - provides predictable, monotonic drift for temperature-compensated references |
| Junction Temp. Range | –65 °C to +175 °C - qualified for extended-temperature industrial, avionics, and downhole applications |
| Package | DO-213AA (SOD-80/MELF) - hermetically sealed glass body with end-cap terminations for high reliability and moisture resistance |
Pinout & Package
DO-213AA (SOD-80/MELF) package: cylindrical glass body with two metallized end caps; cathode identified by black band on one end cap. No discrete pins - terminals are symmetric end caps, requiring orientation-aware placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode End Cap (banded) | Regulated Output Terminal | Connected to positive side of regulated node; reverse bias establishes Zener breakdown |
| Anode End Cap (unbanded) | Reference Ground Terminal | Connected to circuit common; completes Zener conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgical Bonding | Ensures robust thermal and electrical interface between silicon die and end caps for stable 0.5 W operation |
| MIL-PRF-19500 Screening Option | Supports up-screened versions (e.g., JAN, JANTX) for defense and space-grade reliability requirements |
| Low Capacitance | Typical ~1.5 pF (per Figure 3) - preserves high-frequency stability in RF bias and fast-switching regulator nodes |
| Radiation Hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for low-dose space and nuclear instrumentation |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 30 V threshold for error amplifier input. Use Value: Tight 5% tolerance and low ZZT ensure ±1% output regulation accuracy across line/load/temperature variations. | Use Scenario: Supplies stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing bulkier IC references where size and cost are critical. Use Value: +0.091 %/°C tempco and –65 °C to +175 °C range enable direct mounting near hot sensor elements without calibration loss. |
| Aerospace Voltage Clamp | High-Reliability Backup Regulator |
Use Scenario: Protects avionics data bus receivers from transient overvoltage events (e.g., lightning-induced surges). IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting bus voltage to 30 V during ESD/EFT events. Use Value: Hermetic DO-213AA package withstands thermal cycling and humidity exposure in flight control systems. | Use Scenario: Provides fail-safe 30 V backup reference for microcontroller brown-out detection in mission-critical embedded controllers. IC Role / Device Role / Timing Role: Standby-mode Zener maintaining reference integrity when main LDO fails. Use Value: <0.1 µA leakage at 22 V minimizes battery drain in always-on monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256B-TR | Same 30 V, 5% Zener voltage and DO-35 axial package; higher RθJA (300 °C/W) and lower max TJ (150 °C) | Suitable for through-hole prototyping or legacy board rework where MELF placement is unavailable | Select 1N5256B-TR only when axial-leaded assembly is required; avoid in high-density SMT layouts due to footprint and thermal limitations |
| BZX55C30-TR | 30 V, 5% Zener in DO-35; 0.5 W rating but non-hermetic epoxy package and no MIL-PRF-19500 screening option | Acceptable for commercial-grade consumer electronics where radiation hardness and extended temperature are not required | Choose BZX55C30-TR for cost-sensitive volume production; avoid in aerospace, defense, or harsh-environment deployments |
Compared with 1N5256B-TR and BZX55C30-TR, the 1N5256BUR-1/TR delivers superior thermal performance (RθJA = 250 °C/W), extended temperature capability (–65 °C to +175 °C), and hermetic reliability-making it the only choice for high-integrity SMT voltage regulation where long-term stability and environmental resilience are mandatory.
Availability
1N5256BUR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor reference, aerospace voltage clamp, and high-reliability backup regulator applications requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 1N5256BUR-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 analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N52xxBUR-1 series was developed to deliver JEDEC-standard Zener regulation in hermetic surface-mount form, targeting applications demanding radiation tolerance, extended temperature operation, and MIL-PRF-19500 compliance without sacrificing SMT manufacturability.
FAQ
What is the Zener voltage tolerance and test current for the 1N5256BUR-1/TR?
The 1N5256BUR-1/TR has a nominal Zener voltage of 30 V with a ±5% tolerance, measured at a test current (IZT) of 4.2 mA. This tolerance is guaranteed per the "B" suffix in the part number and applies across the full operating temperature range of –65 °C to +175 °C.
Does the 1N5256BUR-1/TR have RoHS-compliant plating?
Yes, the 1N5256BUR-1/TR uses RoHS-compliant annealed matte-tin plating on its end caps, as indicated by the "e3" suffix in the full nomenclature (1N5256BUR-1/TR e3). This plating meets MIL-STD-750, method 2026 for solderability and is qualified for commercial-grade use only.
What is the maximum power dissipation and thermal derating behavior of the 1N5256BUR-1/TR?
The 1N5256BUR-1/TR is rated for 0.5 W steady-state power dissipation at end cap temperature <125 °C or ambient temperature <50 °C on FR4 board. Derating follows a linear curve per Figure 2: power drops to zero at 175 °C ambient, with RθJA = 250 °C/W under specified mounting conditions.
Is the 1N5256BUR-1/TR suitable for radiation-hardened applications?
Yes, the 1N5256BUR-1/TR is inherently radiation-hardened per Microsemi MicroNote 050, due to its metallurgically bonded glass construction and silicon process. It is widely used in low-dose space instrumentation and nuclear facility monitoring where single-event effects must be minimized.
How is polarity marked on the 1N5256BUR-1/TR, and what is its forward voltage?
The 1N5256BUR-1/TR uses a cathode band (black stripe) on one end cap to indicate polarity; the banded end is the cathode and must be held positive relative to the anode for Zener operation. Its forward voltage is ≤1.1 V at 200 mA, consistent across the entire 1N52xxBUR-1 family.
1N5256BUR-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 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
1N5256BUR-1/TR FAQ
1.How can I place an order for 1N5256BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5256BUR-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 1N5256BUR-1/TR reliable?
The price and inventory of 1N5256BUR-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 1N5256BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5256BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5256BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5256BUR-1/TR?
1N5256BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5256BUR-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 1N5256BUR-1/TR?
For technical support, including 1N5256BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5256BUR-1/TR requirements.
6.How does Aetrix verify that 1N5256BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5256BUR-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 1N5256BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5256BUR-1/TR?
All 1N5256BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5256BUR-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 1N5256BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5256BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5256BUR-1/TR Tags
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