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Microchip Technology 1N3049BUR-1/TR
- Part No.:
- 1N3049BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3049BUR-1/TR.pdf
- Description:
- DIODE ZENER 160V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
1N3049BUR-1/TR from Microsemi is a surface-mount, hermetically sealed glass Zener diode in DO-213AB (MELF) package, rated for 1.5 W steady-state power dissipation at end-cap temperature <115°C, with nominal Zener voltage 160 V ±5%, Zener test current 1.6 mA, and maximum Zener impedance 1100 Ω at IZT - used for precision voltage regulation in high-reliability aerospace and industrial power supply circuits.
For engineers reviewing the 1N3049BUR-1/TR datasheet, 1N3049BUR-1/TR pinout, 1N3049BUR-1/TR application, or 1N3049BUR-1/TR equivalent, key selection criteria include its 160 V Zener voltage tolerance, low reverse leakage (≤0.5 μA at VR), radiation-hardened glass construction, -65°C to +175°C operating range, and RoHS-compliant e3 suffix availability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when cathode voltage exceeds anode by ≥160 V. Its metallurgically enhanced internal contact design ensures stable regulation across wide temperature extremes and low thermal resistance (40°C/W junction-to-end-cap).
The DO-213AB MELF package enables high-density mounting with minimal parasitic capacitance (specified in Figure 2), while hermetic glass sealing provides immunity to moisture, contaminants, and ionizing radiation per MicroNote 050 - critical for space-grade and military applications requiring MIL-PRF-19500/115 screening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 160 V ±5% - defines regulated output voltage under 1.6 mA test current; tight tolerance supports stable reference in precision feedback loops. |
| Power Dissipation (PD) | 1.5 W at TEC < 115°C - enables robust operation in thermally constrained environments without forced cooling. |
| Zener Test Current (IZT) | 1.6 mA - establishes standardized measurement condition for VZ; ensures consistent regulation behavior across production lots. |
| Zener Impedance (ZZT) | 1100 Ω at IZT - quantifies dynamic resistance in breakdown region; lower values improve load regulation accuracy. |
| Reverse Leakage Current (IR) | ≤0.5 μA at VR = 121.6 V - minimizes standby power loss and prevents false triggering in high-impedance sensing circuits. |
| Operating Temperature Range | -65°C to +175°C - supports deployment in extreme environments including downhole oil/gas, avionics, and satellite power systems. |
| Package | DO-213AB (MELF) glass - provides hermetic seal, low parasitics, and compatibility with automated SMT placement and reflow. |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed; cathode indicated by single black band; terminals are axial ends - no discrete pins; polarity must be observed during PCB layout (banded end = cathode = positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased configuration requires this terminal at lower potential than cathode. |
| Cathode (banded end) | Voltage regulation output | Provides stabilized 160 V reference when reverse-biased; must be connected to higher-potential node in regulated path. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and outgassing - essential for long-term reliability in vacuum or high-humidity environments. |
| Metallurgically enhanced contact | Reduces thermal resistance (40°C/W junction-to-end-cap) and improves surge current handling vs. standard Zeners. |
| Radiation hardness | Inherently qualified per MicroNote 050 - suitable for low-dose-rate space applications without additional shielding or derating. |
| RoHS compliance (e3 suffix) | Meets EU Directive 2011/65/EU with annealed matte-tin plating - compatible with lead-free reflow profiles up to 260°C/10s. |
| MIL-PRF-19500 screening options | MQ/MX/MV prefixes enable JAN/JANTX/JANTXV qualification - required for defense and aerospace BOMs. |
Applications
| Avionics Power Regulation | Satellite DC-DC Converter Reference |
|---|---|
Use Scenario: Regulating auxiliary 160 V bus in flight control power distribution units where thermal cycling and vibration are severe. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable voltage setpoint for error amplifier feedback loop. Use Value: Hermetic glass seal and -65°C to +175°C rating ensure uninterrupted operation during rapid cabin depressurization and stratospheric thermal excursions. |
Use Scenario: Setting precise output voltage in radiation-tolerant isolated DC-DC converters aboard LEO satellites. IC Role / Device Role / Timing Role: Primary voltage reference in secondary-side feedback network of flyback converter. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy, reducing mass and complexity. |
| Downhole Oilfield Instrumentation | Military Radar Pulse Modulator |
Use Scenario: Stabilizing bias voltage for high-voltage amplifiers in borehole logging tools exposed to 175°C ambient and corrosive fluids. IC Role / Device Role / Timing Role: Zener clamp protecting op-amp inputs from transient overvoltage during sensor excitation pulses. Use Value: 175°C max operating temperature and hermetic seal prevent parameter drift or failure in uncooled, sealed probe housings. |
Use Scenario: Providing regulated gate drive voltage for high-power RF transistors in pulsed radar transmitter modules. IC Role / Device Role / Timing Role: Voltage reference for pulse-width-controlled bias supply ensuring consistent RF output amplitude. Use Value: Low 0.5 μA leakage at 121.6 V prevents unintended turn-on during long off-periods between radar pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3049B (DO-13 through-hole) | Same electrical specs but axial-leaded DO-13 package; 1.0 W power rating; no RoHS e3 option standard. | Requires thru-hole assembly; unsuitable for high-density SMT layouts or automated placement. | Select only if legacy board redesign is impractical and thermal derating to 1.0 W is acceptable. |
| SMCJ160A (SMD TVS diode) | 160 V standoff, 200 W peak power, bidirectional clamping; not a precision Zener - higher leakage (5 μA), looser voltage tolerance (±5% min). | Designed for transient suppression, not regulation; lacks stable low-current Zener knee and temperature coefficient spec. | Use only for overvoltage protection - never as a replacement for precision voltage reference function of 1N3049BUR-1/TR. |
Compared with 1N3049B and SMCJ160A, the 1N3049BUR-1/TR uniquely combines SMT compatibility, 1.5 W power handling, hermetic reliability, and tight 160 V ±5% regulation - making it irreplaceable in high-reliability, high-temperature, radiation-aware designs where voltage stability and long-term parametric consistency are mandatory.
Availability
1N3049BUR-1/TR is available at Aetrix Electronics and suitable for avionics power regulation, satellite DC-DC converter reference, and downhole oilfield instrumentation requiring stable component supply with full traceability and extended lifecycle support.
Supply support for 1N3049BUR-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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N3016BUR-1 through 1N3051BUR-1 series was designed specifically to deliver JEDEC 1N30xx performance in surface-mount form - addressing demand for radiation-hardened, high-temperature Zener references in mission-critical power systems.
FAQ
What is the Zener voltage tolerance for 1N3049BUR-1/TR?
The 1N3049BUR-1/TR has a nominal Zener voltage of 160 V with a tolerance of ±5%, indicated by the "B" suffix per Note 1 on page 2 of the datasheet. This tighter tolerance ensures predictable regulation in precision feedback networks where voltage drift must remain within strict limits across temperature and aging.
Is 1N3049BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in 1N3049BUR-1/TR confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating and is qualified for lead-free reflow soldering at 260°C for 10 seconds, meeting MIL-STD-750 Method 2026 requirements.
Can 1N3049BUR-1/TR be used in radiation-exposed environments?
Yes, the 1N3049BUR-1/TR is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its hermetically sealed glass construction and metallurgical design provide proven resilience to total ionizing dose (TID) effects - making it suitable for low-earth orbit satellite and nuclear instrumentation applications.
What is the maximum reverse leakage current for 1N3049BUR-1/TR?
The maximum reverse leakage current for 1N3049BUR-1/TR is 0.5 μA at VR = 121.6 V (76% of nominal 160 V), as specified in the Electrical Characteristics table on page 2. This ultra-low leakage preserves signal integrity in high-impedance reference paths and minimizes standby power loss.
Does 1N3049BUR-1/TR require heatsinking on FR4 PCB?
No dedicated heatsink is required, but thermal performance depends on PCB layout. When mounted on 1 oz copper FR4 with the recommended footprint, thermal resistance is 120°C/W junction-to-ambient. At 25°C ambient, maximum steady-state power is 1.25 W - exceeding the 1.5 W end-cap rating only if end-cap temperature remains below 115°C.
1N3049BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 1100 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 121.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N3049BUR-1/TR FAQ
1.How can I place an order for 1N3049BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3049BUR-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 1N3049BUR-1/TR reliable?
The price and inventory of 1N3049BUR-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 1N3049BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3049BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3049BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3049BUR-1/TR?
1N3049BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3049BUR-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 1N3049BUR-1/TR?
For technical support, including 1N3049BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3049BUR-1/TR requirements.
6.How does Aetrix verify that 1N3049BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3049BUR-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 1N3049BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3049BUR-1/TR?
All 1N3049BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3049BUR-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 1N3049BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3049BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3049BUR-1/TR Tags
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