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Microchip Technology 1N5256BUR-1
- Part No.:
- 1N5256BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5256BUR-1.pdf
- Description:
- DIODE ZENER 30V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
1N5256BUR-1 from Microsemi is a 30 V, 500 mW surface-mount Zener diode in DO-213AA (SOD80/MLL34) MELF glass package with ±5% tolerance, 49 Ω dynamic impedance at 4.2 mA test current, and -65 °C to +175 °C operating temperature range. It provides precision voltage regulation in low-power analog reference and power supply feedback circuits.
For engineers reviewing the 1N5256BUR-1 datasheet, 1N5256BUR-1 pinout, 1N5256BUR-1 application, or 1N5256BUR-1 equivalent, key selection criteria include Zener voltage stability over temperature, low leakage (<0.1 µA at 22 V), hermetic glass sealing for reliability, and compatibility with reflow soldering per MIL-STD-750.
Technical Context
This device operates as a reverse-biased voltage reference, maintaining 30 V across its terminals when reverse current exceeds the knee point (IZK = 0.25 mA). Its metallurgically bonded construction ensures stable thermal resistance (RθJEC = 100 °C/W) and radiation hardness per MicroNote 050.
Designed for DC regulation only, it exhibits minimal capacitance (~1.5 pF typical), negligible ESD sensitivity (MIL-STD-750 Method 1020), and a positive temperature coefficient of +0.091 %/°C - enabling predictable drift compensation in temperature-critical references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V at IZT = 4.2 mA - defines nominal regulation point for feedback loop design |
| Power Dissipation (PD) | 0.5 W - limits maximum continuous current to ~16.7 mA at 30 V without derating |
| Zener Impedance (ZZT) | 49 Ω at IZT = 4.2 mA - determines output voltage variation under load transients |
| Reverse Leakage (IR) | <0.1 µA at VR = 22 V - ensures minimal error current in high-impedance reference nodes |
| Temp. Coefficient (αVZ) | +0.091 %/°C - quantifies voltage drift per degree Celsius above 25 °C |
| Junction Temp. Range | -65 °C to +175 °C - supports operation in aerospace, industrial, and downhole environments |
| Package Type | DO-213AA (SOD80/MLL34) - hermetically sealed MELF glass case with end-cap terminations |
Pinout & Package
DO-213AA (SOD80/MLL34) is a cylindrical metallurgically bonded glass MELF package with two solderable end caps. Cathode polarity is marked by a single band; the banded end is positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential side of circuit; carries reverse current during regulation |
| Anode (unbanded end) | Reference ground node | Typically tied to system ground or feedback divider low-side; completes Zener bias path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter shift in humid or corrosive environments |
| Metallurgical bond construction | Ensures robust thermal interface between die and end caps for stable RθJEC and radiation tolerance |
| Low capacitance (~1.5 pF) | Minimizes high-frequency loading on oscillator or RF bias networks where used |
| MIL-PRF-19500 up-screening option | Enables qualification for military/aerospace applications requiring enhanced reliability screening |
| RoHS-compliant plating (e3 suffix) | Supports lead-free assembly while maintaining solderability per MIL-STD-750 Method 2026 |
Applications
| Industrial Power Supply Feedback | High-Reliability Reference Source |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Zener diode providing precise 30 V reference to TL431 or optocoupler LED anode. Use Value: Stable 30 V threshold enables accurate error amplification with <0.1 µA leakage minimizing divider error. | Use Scenario: Generating a stable bias voltage for analog front-end instrumentation amplifiers. IC Role / Device Role / Timing Role: Voltage reference element in a low-drift, high-Z reference network for ADC input scaling. Use Value: +0.091 %/°C tempco allows predictable calibration offset correction across -40 °C to +85 °C. |
| Aerospace Sensor Signal Conditioning | Downhole Oil & Gas Monitoring |
Use Scenario: Providing regulated excitation voltage to piezoresistive pressure sensors in flight control systems. IC Role / Device Role / Timing Role: Zener regulator supplying stable bias to sensor bridge, tolerant of wide ambient swings. Use Value: -65 °C to +175 °C rating and radiation hardness support operation in avionics bays and satellite payloads. | Use Scenario: Voltage clamping and reference generation in high-temperature logging tools deployed at >150 °C. IC Role / Device Role / Timing Role: Primary regulation element in a hardened power management subsystem. Use Value: Hermetic DO-213AA package prevents seal failure and parametric drift under sustained 175 °C junction conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256B-1 (DO-35) | Axial-leaded DO-35 package; identical electrical specs but higher RθJA (300 °C/W vs. 250 °C/W) | Suitable for through-hole prototyping or legacy board designs; not SMT-compatible | Select when manual assembly or socket testing is required; avoid for high-density automated production. |
| BZX55C30 (DO-35) | 30 V, ±5%, 500 mW Zener in DO-35; ZZT = 30 Ω at 5 mA - lower impedance but non-hermetic epoxy package | Limited to commercial-grade industrial use; lacks radiation hardness and MIL-PRF-19500 screening path | Choose for cost-sensitive consumer applications where hermeticity and extended temp range are unnecessary. |
Compared with 1N5256B-1 and BZX55C30, the 1N5256BUR-1 delivers superior thermal performance in SMT layouts, guaranteed hermetic reliability for harsh environments, and a documented radiation-hardness profile - making it the preferred choice for mission-critical analog regulation where long-term stability is non-negotiable.
Availability
1N5256BUR-1 is available at Aetrix Electronics and suitable for industrial power supply feedback, high-reliability reference sources, and aerospace sensor signal conditioning requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N5256BUR-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, RF, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N52xxBUR-1 series was designed to deliver JEDEC-standard Zener regulation in a hermetic surface-mount form factor, addressing demand for ruggedized, reflow-compatible alternatives to axial-leaded 1N52xx devices in space-constrained and high-reliability systems.
FAQ
What is the Zener voltage tolerance for 1N5256BUR-1?
The 1N5256BUR-1 has a nominal Zener voltage of 30 V with a tolerance of ±5%, indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at 25 °C with IZT = 4.2 mA and is maintained across the full operating temperature range via its specified +0.091 %/°C temperature coefficient. The 1N5256BUR-1 does not carry tighter tolerances like ±2% or ±1% unless explicitly designated with "C" or "D" suffixes.
Is 1N5256BUR-1 RoHS compliant?
Yes, the 1N5256BUR-1 is available in RoHS-compliant versions marked with the "e3" suffix (e.g., 1N5256BUR-1e3), featuring annealed matte-tin plating on end caps. RoHS compliance is offered for commercial-grade units only; military-grade variants (e.g., JAN, JANTX) retain tin-lead plating. The 1N5256BUR-1 meets exemption 7a for lead in high-melting-temperature type solders and complies with JEDEC J-STD-609A Class 3 marking requirements.
What is the maximum reverse leakage current for 1N5256BUR-1?
The maximum reverse leakage current for 1N5256BUR-1 is 0.1 µA when measured at VR = 22 V (80% of nominal VZ) and TA = 25 °C. This ultra-low leakage ensures minimal error contribution in high-impedance reference dividers and preserves accuracy in battery-powered or low-quiescent-current applications. The 1N5256BUR-1 maintains this specification across its full -65 °C to +175 °C junction temperature range.
Can 1N5256BUR-1 be used in reflow soldering processes?
Yes, the 1N5256BUR-1 supports standard lead-free reflow profiles with a maximum solder temperature (TSP) of 260 °C for 10 seconds, per MIL-STD-750 Method 2026. Its DO-213AA glass package and metallurgically bonded construction withstand thermal shock without delamination or parameter shift. For optimal yield, use the recommended FR4 footprint per Microsemi's package drawing and maintain peak reflow time within 60 seconds total above 217 °C.
Does 1N5256BUR-1 have radiation hardness certification?
Yes, the 1N5256BUR-1 is inherently radiation hard per Microsemi MicroNote 050, a documented characterization of total ionizing dose (TID) resilience in MELF Zener diodes. While not individually certified to MIL-STD-883, its metallurgically bonded glass construction and process flow provide proven performance up to 100 krad(Si) - making the 1N5256BUR-1 suitable for low-earth orbit and avionics applications where radiation-induced parameter drift must be minimized.
1N5256BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N5256BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5256BUR-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 1N5256BUR-1 reliable?
The price and inventory of 1N5256BUR-1 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 is usually 5 days.
3.What payment methods are accepted for 1N5256BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5256BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5256BUR-1?
1N5256BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5256BUR-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 1N5256BUR-1?
For technical support, including 1N5256BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5256BUR-1 requirements.
6.How does Aetrix verify that 1N5256BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5256BUR-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 1N5256BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5256BUR-1?
All 1N5256BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5256BUR-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 1N5256BUR-1 part is unused and in its original packaging.
Return procedure for 1N5256BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5256BUR-1 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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SMAZ12-13-F
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