My Inquiry
My Account
Microchip Technology 1N3046BUR-1
- Part No.:
- 1N3046BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
1N3046BUR-1.pdf
- Description:
- DIODE ZENER 120V 1.5W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,389
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N3046BUR-1 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%, Zener test current of 2.0 mA, maximum Zener impedance of 550 Ω at IZT, and reverse leakage current ≤0.5 μA at VR = 100 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits.
For engineers reviewing the 1N3046BUR-1 datasheet, 1N3046BUR-1 pinout, 1N3046BUR-1 application, or 1N3046BUR-1 equivalent, key selection criteria include its 120 V Zener voltage tolerance, low 0.5 μA leakage at 100 V, radiation-hardened glass construction, -65°C to +175°C operating temperature range, and suitability for aerospace-grade voltage stabilization where thermal stability and hermetic sealing are critical.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across wide current (IZK = 0.25 mA to IZM = 12 mA) and temperature (-65°C to +175°C) ranges. Its metallurgically enhanced internal contact design reduces thermal resistance (120°C/W junction-to-ambient on FR4), enabling reliable operation under sustained power stress.
The DO-213AB MELF package provides low parasitic capacitance (typ. <2 pF at VR = 0 V, per Figure 2), tight voltage tolerances (±5% standard), and inherent radiation hardness per MicroNote 050 - features essential for space-qualified and military-grade analog signal conditioning and power rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 120 V ±5% - defines precise clamping threshold for 100–130 V rail protection |
| Power Dissipation | 1.5 W at 25°C - supports continuous regulation without heatsinking in compact layouts |
| Zener Test Current | 2.0 mA - ensures stable 120 V output under minimal bias current |
| Max Zener Impedance | 550 Ω at IZT - limits voltage deviation under dynamic load transients |
| Reverse Leakage Current | ≤0.5 μA at VR = 100 V - minimizes standby power loss in high-impedance bias networks |
| Operating Temperature | -65°C to +175°C - enables deployment in engine control units and downhole electronics |
| Thermal Resistance | 120°C/W junction-to-ambient (FR4, 1 oz Cu) - informs PCB copper area requirements for thermal management |
Pinout & Package
DO-213AB (MELF) glass package: cylindrical, leadless, hermetically sealed, cathode band marked on one end. Dimensions: A = 2.39–2.66 mm (diameter), B = 4.80–5.20 mm (length), weight = 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point | Must be biased positive relative to anode to enter reverse breakdown; polarity marking critical for correct orientation in PCB layout |
| Anode (unbanded end) | Zener cathode connection point | Connected to lower-potential node (e.g., ground or return path); forms regulated output reference when cathode is at higher potential |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgically enhanced contacts | Reduces thermal resistance by ~25% vs. standard DO-13 equivalents, improving power handling reliability |
| Radiation hardness (MicroNote 050) | Validated performance in total ionizing dose (TID) environments up to 100 krad(Si), suitable for LEO satellite systems |
| Low reverse leakage (≤0.5 μA) | Enables use in ultra-low-power bias networks and high-impedance voltage references without loading error |
| RoHS-compliant "e3" variant | Meets EU Directive 2011/65/EU with annealed matte-tin plating, solderable per MIL-STD-750 Method 2026 |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
Use Scenario: Regulating auxiliary 120 V DC bus in satellite power distribution units exposed to thermal cycling and radiation. IC Role / Device Role / Timing Role: Zener diode acting as primary voltage clamp and secondary reference source for ADC biasing. Use Value: Hermetic seal and radiation hardness ensure stable 120 V reference over mission lifetime without parameter shift. | Use Scenario: Providing stable 120 V reference for analog sensor signal conditioning in fighter jet flight control computers. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining reference integrity during EMI-rich avionics operation. Use Value: Low 0.5 μA leakage prevents reference droop in high-Z feedback networks under extreme temperature (-65°C to +175°C). |
| Downhole Oilfield Instrumentation | Industrial High-Voltage Monitoring |
Use Scenario: Overvoltage protection for 100–130 V sensor excitation rails in borehole pressure/temperature gauges. IC Role / Device Role / Timing Role: Clamp diode absorbing transient surges while maintaining steady-state regulation. Use Value: DO-213AB package withstands mechanical shock and thermal shock during drill-string vibration and rapid temperature changes. | Use Scenario: Voltage reference for isolation amplifier input stages monitoring 120 V industrial AC line-derived DC supplies. IC Role / Device Role / Timing Role: Shunt regulator establishing accurate 120 V threshold for fault detection logic. Use Value: Tight ±5% tolerance and low tempco (0.095%/°C) minimize calibration drift across 40–85°C ambient range. |
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) | Same electrical specs but axial-leaded DO-13 package; 1.0 W rating; no RoHS e3 option | Requires through-hole mounting; unsuitable for high-density SMT assemblies | Select only when legacy board compatibility or manual prototyping overrides surface-mount density needs |
| MMBZ5262B (SOT-23) | 120 V Zener, but 0.225 W rating, ±5% tolerance, silicon plastic package, max IZM = 10 mA | Limited to low-power signal-level regulation; not radiation-hardened or hermetically sealed | Choose only for cost-sensitive commercial applications where reliability and radiation immunity are non-critical |
Compared with 1N3046B and MMBZ5262B, the 1N3046BUR-1 uniquely combines 1.5 W power handling, DO-213AB surface-mount form factor, hermetic glass sealing, and radiation hardness - making it irreplaceable in aerospace, defense, and oilfield electronics where environmental robustness and long-term parametric stability are mandatory.
Availability
1N3046BUR-1 is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference design, and downhole oilfield instrumentation requiring stable component supply under extended temperature and radiation exposure conditions.
Supply support for 1N3046BUR-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 (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 1N3016BUR-1 to 1N3051BUR-1 series was designed specifically for surface-mount voltage regulation in mission-critical systems demanding hermetic sealing, wide temperature operation, and proven radiation tolerance - extending legacy 1N30xx performance into modern SMT platforms.
FAQ
What is the Zener voltage tolerance for 1N3046BUR-1?
The 1N3046BUR-1 has a nominal Zener voltage of 120 V with a standard tolerance of ±5%, indicated by the absence of a tolerance suffix (e.g., "A" = ±10%, "C" = ±2%). This tolerance is verified at 2.0 mA test current and 25°C ambient, ensuring predictable clamping behavior in precision regulation circuits.
Is 1N3046BUR-1 RoHS compliant?
Yes, the 1N3046BUR-1 is RoHS compliant when ordered with the "e3" suffix (i.e., 1N3046BUR-1e3), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. The base part without "e3" uses tin-lead plating and is not RoHS compliant.
What is the maximum power dissipation of 1N3046BUR-1 at 100°C ambient?
Per the derating curve in Figure 1, the 1N3046BUR-1 delivers 0.75 W at 100°C ambient temperature on FR4 with 1 oz copper. Its full 1.5 W rating applies only at 25°C; linear derating begins above 25°C at 12.5 mW/°C, reaching zero at 145°C ambient.
Does 1N3046BUR-1 have radiation hardness certification?
Yes, the 1N3046BUR-1 exhibits inherent radiation hardness as documented in Microsemi MicroNote 050, with validated performance up to 100 krad(Si) total ionizing dose - a key qualification for use in low-Earth orbit satellite subsystems and nuclear instrumentation.
What is the thermal resistance junction-to-end-cap for 1N3046BUR-1?
The 1N3046BUR-1 has a thermal resistance of 40°C/W junction-to-end-cap, measured under controlled conditions. This value enables direct thermal modeling when mounted to a metal chassis or heat-spreading pad, supporting thermal design in conduction-cooled modules where ambient air cooling is insufficient.
1N3046BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- 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:
- 10 µA @ 91.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB
1N3046BUR-1 FAQ
1.How can I place an order for 1N3046BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3046BUR-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 1N3046BUR-1 reliable?
The price and inventory of 1N3046BUR-1 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 is usually 5 days.
3.What payment methods are accepted for 1N3046BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3046BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3046BUR-1?
1N3046BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3046BUR-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 1N3046BUR-1?
For technical support, including 1N3046BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3046BUR-1 requirements.
6.How does Aetrix verify that 1N3046BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N3046BUR-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 1N3046BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N3046BUR-1?
All 1N3046BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3046BUR-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 1N3046BUR-1 part is unused and in its original packaging.
Return procedure for 1N3046BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3046BUR-1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
