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Microchip Technology 1N3046BUR-1/TR
- Part No.:
- 1N3046BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3046BUR-1/TR.pdf
- Description:
- DIODE ZENER 120V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,980
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Product details
Overview
1N3046BUR-1/TR from Microsemi is a surface-mount, hermetically sealed glass Zener diode in DO-213AB (MELF) package, rated for 1.5 W power dissipation at 25°C, with nominal Zener voltage of 120 V ±5% (suffix "B"), 2.0 mA test current (IZT), 550 Ω dynamic impedance (ZZT), and maximum reverse leakage of 0.5 μA at 96 V (80% of VZ). It serves voltage regulation in high-reliability power supply feedback loops and precision reference circuits.
For engineers reviewing the 1N3046BUR-1/TR datasheet, 1N3046BUR-1/TR pinout, 1N3046BUR-1/TR application, or 1N3046BUR-1/TR equivalent, key selection criteria include its 120 V Zener voltage tolerance, low 0.5 μA IR at 96 V, 550 Ω Zener impedance at IZT, -65°C to +175°C operating temperature range, and DO-213AB MELF package compatibility with high-density SMT layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable output voltage across wide current (2.0–12 mA) and temperature (-65°C to +175°C) ranges. Its metallurgically enhanced internal contact construction reduces thermal resistance (40°C/W junction-to-end-cap) and improves long-term stability under thermal cycling.
The DO-213AB glass MELF package provides hermetic sealing, inherent radiation hardness per MicroNote 050, and ESD insensitivity. Capacitance is specified (see Figure 2), and polarity is marked by a cathode band - operation requires the banded end to be positive relative to the unmarked end during Zener regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 120 V ±5% at 2.0 mA - defines precise regulation point for feedback networks in isolated DC/DC converters. |
| Power Dissipation | 1.5 W at 25°C end-cap temperature - supports robust thermal margin in compact power supplies without forced cooling. |
| Zener Impedance (ZZT) | 550 Ω at IZT = 2.0 mA - ensures minimal output voltage variation under load transients in reference circuits. |
| Reverse Leakage (IR) | 0.5 μA max at VR = 96 V (80% VZ) - enables low-error biasing in high-impedance sensing nodes. |
| Operating Temp Range | -65°C to +175°C - qualified for aerospace, downhole, and military systems requiring extreme environmental resilience. |
| Package | DO-213AB (MELF) glass - hermetic seal prevents moisture ingress; double-slug construction enhances reliability vs. plastic SMD diodes. |
| Thermal Resistance | 40°C/W junction-to-end-cap - allows direct thermal coupling to heatsinking pads on PCB for sustained 1.25 W operation at TA = 25°C. |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed; cathode identified by single black band; terminals are axial - no discrete pins, but two metallized end caps serving as anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to reference input of error amplifier; must be held positive relative to anode for Zener conduction. |
| Anode (unmarked end) | Return/reference ground | Tied to system ground or feedback divider low-side; forms current path through series resistor to input rail. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture-induced parameter drift and corrosion failure modes in humid or high-reliability environments. |
| Metallurgically enhanced contacts | Reduces interfacial thermal resistance and improves long-term Zener voltage stability under thermal stress. |
| Nonsensitive to ESD | Enables safe handling and assembly without special grounding protocols - critical for automated SMT lines. |
| Radiation-hardened design | Qualified per MicroNote 050 for total ionizing dose (TID) tolerance - suitable for space and nuclear applications. |
| RoHS-compliant (e3 suffix) | Tin-plated terminals meet MIL-STD-750 Method 2026 solderability requirements and environmental compliance mandates. |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters where primary-side sensing replaces optocoupler feedback. IC Role / Device Role / Timing Role: Zener diode providing stable 120 V reference to TL431 or error amplifier input. Use Value: Tight ±5% VZ tolerance and low 0.5 μA leakage ensure <±1% output regulation accuracy over temperature and line variations. |
Use Scenario: Precision voltage reference in satellite power management units exposed to radiation and thermal cycling. IC Role / Device Role / Timing Role: Standalone Zener reference replacing IC-based references where radiation susceptibility must be minimized. Use Value: Hermetic glass package and radiation-hardened construction enable >100 krad(Si) TID tolerance without derating. |
| Downhole Instrumentation Biasing | Military Grade Test Equipment |
Use Scenario: Providing stable bias voltage for pressure/temperature sensor front-ends in oil/gas well logging tools. IC Role / Device Role / Timing Role: High-temperature Zener shunt regulating sensor excitation rails at 175°C ambient. Use Value: Full -65°C to +175°C operational range and 40°C/W junction-to-end-cap thermal resistance allow direct mounting to metal-core PCBs. |
Use Scenario: Calibrated reference in portable field-testers requiring traceable, stable voltage standards. IC Role / Device Role / Timing Role: Primary 120 V reference element in multi-range DMM calibration circuits. Use Value: Low 550 Ω ZZT and tight ±5% VZ ensure <0.01% reference drift during 24-hour calibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3046B (DO-13 axial) | Same electrical specs, but axial leaded DO-13 package; higher thermal resistance (junction-to-ambient ~150°C/W). | Requires through-hole mounting; unsuitable for high-density SMT designs or automated assembly. | Select only when legacy board layout or manual repair constraints prohibit surface-mount components. |
| SMF120A (ON Semiconductor) | 120 V, 1.5 W, SOD-123 package; lower leakage (1.0 μA @ 96 V), higher ZZT (1.2 kΩ), non-hermetic plastic body. | Lacks radiation hardness and hermeticity; not qualified for aerospace or high-reliability mil-spec use. | Acceptable for commercial-grade power supplies where cost and footprint are prioritized over long-term stability. |
Compared with 1N3046BUR-1/TR, the DO-13 1N3046B sacrifices SMT compatibility and thermal performance, while the SMF120A trades hermetic reliability and radiation tolerance for lower cost and smaller footprint - making 1N3046BUR-1/TR the sole choice for mission-critical, high-temperature, or radiation-exposed applications.
Availability
1N3046BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, and downhole instrumentation biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3046BUR-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, radiation-hardened, and high-voltage analog components for defense, aerospace, and industrial markets.
The 1N3046BUR-1/TR belongs to Microsemi's legacy glass Zener diode family designed specifically for applications demanding hermetic sealing, extreme temperature operation, and immunity to radiation-induced degradation.
FAQ
What is the Zener voltage tolerance for 1N3046BUR-1/TR?
The "B" suffix in 1N3046BUR-1/TR denotes a ±5% tolerance on the nominal 120 V Zener voltage, measured at 2.0 mA test current and 25°C. This tighter tolerance enables precision regulation in feedback networks where output accuracy is critical, such as in medical or test equipment power supplies.
Does 1N3046BUR-1/TR require a heatsink in standard FR4 PCB mounting?
No external heatsink is required for 1N3046BUR-1/TR at ≤1.25 W dissipation when mounted on FR4 with the recommended footprint (1 oz Cu), as its thermal resistance is 120°C/W junction-to-ambient. However, for sustained 1.5 W operation, thermal coupling to a metal-core or copper-pour area is advised to keep junction temperature within -65°C to +175°C limits.
Is 1N3046BUR-1/TR RoHS compliant?
Yes - the "e3" suffix in 1N3046BUR-1/TR confirms RoHS compliance, with annealed matte-tin plating meeting MIL-STD-750 Method 2026 solderability requirements. The device is fully compatible with lead-free reflow profiles up to 260°C for 10 seconds.
How is polarity marked on 1N3046BUR-1/TR?
Polarity is indicated by a single black cathode band on the glass body of 1N3046BUR-1/TR. During Zener regulation, the banded end must be held positive relative to the unmarked (anode) end. Reversing polarity subjects the device to forward conduction only, with VF ≤1.2 V at 200 mA - not intended for regulation.
Can 1N3046BUR-1/TR replace older 1N3046B in existing designs?
Yes - 1N3046BUR-1/TR shares identical electrical specifications with the axial 1N3046B but uses a DO-213AB surface-mount package. Layout redesign is required due to different footprint and thermal path, but no circuit changes are needed. The TR suffix confirms tape-and-reel packaging for automated placement.
1N3046BUR-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):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 550 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 91.2 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)
1N3046BUR-1/TR FAQ
1.How can I place an order for 1N3046BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3046BUR-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 1N3046BUR-1/TR reliable?
The price and inventory of 1N3046BUR-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 1N3046BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3046BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3046BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3046BUR-1/TR?
1N3046BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3046BUR-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 1N3046BUR-1/TR?
For technical support, including 1N3046BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3046BUR-1/TR requirements.
6.How does Aetrix verify that 1N3046BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3046BUR-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 1N3046BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3046BUR-1/TR?
All 1N3046BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3046BUR-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 1N3046BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3046BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3046BUR-1/TR Tags
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