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Microchip Technology 1N5246BUR-1
- Part No.:
- 1N5246BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5246BUR-1.pdf
- Description:
- DIODE ZENER 16V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,346
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Product details
Overview
1N5246BUR-1 from Microsemi is a hermetically sealed, metallurgically bonded glass MELF Zener diode rated for 16 V nominal regulation at 7.8 mA test current, with 5% tolerance, 0.5 W power dissipation, and DO-213AA (SOD80/MLL34) surface-mount package. It delivers stable voltage reference in precision analog circuits, low-power sensor interfaces, and industrial control power rails.
For engineers reviewing the 1N5246BUR-1 datasheet, 1N5246BUR-1 pinout, 1N5246BUR-1 application, or 1N5246BUR-1 equivalent, key selection criteria include its ±5% Zener voltage tolerance, 17 Ω dynamic impedance at 7.8 mA, +0.083 %/°C temperature coefficient, and suitability for high-reliability, radiation-hardened, or ESD-insensitive designs per MIL-STD-750.
Technical Context
This device operates as a two-terminal reverse-biased voltage regulator, conducting in breakdown when cathode voltage exceeds anode by ≥16 V. Its metallurgical bond ensures thermal stability across -65 °C to +175 °C junction temperature range, with 100 °C/W junction-to-end-cap thermal resistance enabling reliable operation under sustained 0.5 W dissipation at TEC < 125 °C.
It exhibits minimal capacitance (~1.5 pF typical at 16 V), low leakage (≤0.1 µA at 11.4 V), and inherent radiation hardness per MicroNote 050 - features critical for aerospace, medical, and defense applications where long-term parametric drift and single-event effects must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 16 V ±5% at IZT = 7.8 mA - defines precise regulation point for feedback loops and reference generation. |
| Power Dissipation PD | 0.5 W - supports continuous operation in compact SMT layouts without forced cooling on FR4. |
| Dynamic Impedance ZZT | 17 Ω at IZT = 7.8 mA - ensures low output impedance for stable regulation under load transients. |
| Temp. Coefficient αVZ | +0.083 %/°C - enables predictable voltage drift compensation in wide-temperature-range systems. |
| Reverse Leakage IR | ≤0.1 µA at VR = 11.4 V - minimizes standby current in battery-powered or high-impedance bias networks. |
| Junction Temp. Range | -65 °C to +175 °C - qualified for extreme-environment use including downhole, avionics, and military electronics. |
Pinout & Package
DO-213AA (SOD80 / MLL34) metallurgically bonded glass MELF package: hermetically sealed, cathode band marked, end-cap terminals only - no leads or pads. Dimensions: Ø1.6–1.7 mm × L3.3–3.7 mm. Weight: 0.04 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or lowest potential; establishes Zener bias polarity. |
| Cathode (banded end) | Regulated output node | Provides stable 16 V reference when reverse-biased; connects to feedback or load. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and intermetallic degradation - extends lifetime beyond 20 years in harsh environments. |
| Metallurgical bonding | Reduces thermal interface resistance between die and end cap - improves power cycling reliability vs. epoxy-bonded alternatives. |
| MIL-PRF-19500 up-screening option | Enables qualification to Class B or Class S screening levels for space-grade or high-reliability programs. |
| Radiation hardness (per MicroNote 050) | Withstands total ionizing dose (TID) >100 krad(Si) - suitable for satellite power management and nuclear instrumentation. |
| ESD insensitivity (MIL-STD-750 Method 1020) | No damage or parameter shift at ≥4 kV HBM - simplifies handling and eliminates need for ESD protection circuitry. |
Applications
| Industrial Sensor Signal Conditioning | Aerospace Power Monitor Reference |
|---|---|
|
Use Scenario: Precision bridge sensor excitation and ADC reference in factory automation pressure transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 16 V excitation and ratiometric reference for 24-bit sigma-delta ADCs. Use Value: Enables <±0.05% full-scale accuracy over -40 °C to +85 °C due to low tempco and minimal leakage-induced offset. |
Use Scenario: Voltage monitoring of 28 V DC bus in satellite power distribution units. IC Role / Device Role / Timing Role: Regulator element in discrete overvoltage clamp and reference divider network feeding comparator inputs. Use Value: Survives >100 krad(Si) TID exposure while maintaining regulation within ±1% - avoids recalibration or replacement in orbit. |
| Medical Diagnostic Equipment Bias | Military Radio Frequency Front-End |
|
Use Scenario: High-stability bias supply for photomultiplier tube (PMT) gain control in portable X-ray analyzers. IC Role / Device Role / Timing Role: Primary voltage reference for digitally controlled HV generator feedback loop. Use Value: Delivers <10 ppm/°C drift and <0.1 µA leakage - critical for maintaining consistent PMT gain across battery discharge cycles. |
Use Scenario: Local regulation for low-noise amplifier (LNA) bias in handheld tactical radios operating in desert environments. IC Role / Device Role / Timing Role: Zener-based shunt regulator supplying clean 16 V to GaAs FET drain nodes. Use Value: Maintains regulation stability at +125 °C ambient with no derating required - enables extended mission duration without thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5246B-1 (DO-35 axial) | Same electrical specs but axial-leaded DO-35 package; higher RθJA (300 °C/W), no hermetic seal. | Limited to commercial PCBs with through-hole assembly; unsuitable for vibration-prone or high-humidity environments. | Select only if legacy board layout prohibits SMT or cost sensitivity outweighs reliability requirements. |
| BZX55C16 (Nexperia) | 16 V, 5%, 500 mW, DO-35; non-hermetic epoxy package; tempco +0.075 %/°C; no radiation hardness data. | Not qualified for aerospace or medical use; lacks MIL-PRF-19500 screening path or ESD immunity certification. | Acceptable for consumer-grade power supplies where radiation tolerance and long-term drift are not design constraints. |
Compared with 1N5246B-1 and BZX55C16, the 1N5246BUR-1 uniquely combines hermetic MELF packaging, radiation hardness, MIL-qualified screening options, and ESD insensitivity - making it the only choice for mission-critical analog references where field failure is unacceptable.
Availability
1N5246BUR-1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, aerospace power monitoring, and medical diagnostic equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 1N5246BUR-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, radiation-hardened, and ultra-low-noise analog components for defense, aerospace, and medical markets.
The 1N52xxBUR-1 series was designed specifically to deliver JEDEC-standard Zener performance in hermetic MELF packages for applications demanding extended temperature operation, long-term parametric stability, and immunity to environmental stressors.
FAQ
What is the Zener voltage tolerance for 1N5246BUR-1?
The 1N5246BUR-1 has a nominal Zener voltage of 16 V with a ±5% tolerance, corresponding to the "B" suffix in its nomenclature. This means the actual measured VZ at IZT = 7.8 mA falls between 15.2 V and 16.8 V across the full temperature range. The tolerance is guaranteed per JEDEC standard and verified during production screening.
Is 1N5246BUR-1 RoHS compliant?
Yes, the 1N5246BUR-1 is available in RoHS-compliant versions (marked with "e3" suffix, e.g., 1N5246BUR-1e3), but only for commercial-grade units. RoHS compliance applies to the annealed matte-tin plating on end caps and conforms to EU Directive 2011/65/EU. Military or up-screened variants retain tin-lead plating.
What is the maximum power dissipation for 1N5246BUR-1 at 75 °C ambient?
At 75 °C ambient temperature on a standard FR4 board (1 oz Cu), the 1N5246BUR-1 must be derated per Figure 2 in the datasheet. With RθJA = 250 °C/W, its usable power drops to approximately 0.3 W. Full 0.5 W operation is only permitted below 50 °C ambient or when end-cap temperature remains below 125 °C.
Does 1N5246BUR-1 require external heat sinking?
No, the 1N5246BUR-1 does not require external heat sinking in typical applications. Its DO-213AA package relies on end-cap conduction into the PCB copper pour. For continuous 0.5 W operation, a minimum 100 mm² copper pad (1 oz Cu) per end cap is recommended per the datasheet footprint guidelines - sufficient for thermal management without added heatsinks.
Can 1N5246BUR-1 be used in place of 1N5246B-1?
Yes, the 1N5246BUR-1 is a direct surface-mount functional replacement for the axial 1N5246B-1, sharing identical electrical specifications (16 V, ±5%, 0.5 W). However, mechanical integration differs: the BUR-1 requires MELF-compatible pick-and-place and reflow profiles, while the B-1 uses through-hole mounting. No circuit redesign is needed, but board layout must accommodate the DO-213AA footprint.
1N5246BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
1N5246BUR-1 FAQ
1.How can I place an order for 1N5246BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246BUR-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 1N5246BUR-1 reliable?
The price and inventory of 1N5246BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5246BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5246BUR-1?
1N5246BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246BUR-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 1N5246BUR-1?
For technical support, including 1N5246BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246BUR-1 requirements.
6.How does Aetrix verify that 1N5246BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5246BUR-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 1N5246BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5246BUR-1?
All 1N5246BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246BUR-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 1N5246BUR-1 part is unused and in its original packaging.
Return procedure for 1N5246BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5246BUR-1 Tags
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