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Microchip Technology 1N3040BUR-1/TR
- Part No.:
- 1N3040BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N3040BUR-1/TR.pdf
- Description:
- DIODE ZENER 68V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,278
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Product details
Overview
1N3040BUR-1/TR from Microsemi is a hermetically sealed, metallurgically bonded surface-mount Zener diode in DO-213AB (MELF/LL41) package, rated for 1 W DC power dissipation, with nominal Zener voltage of 68 V at 3.7 mA test current, dynamic impedance of 150 Ω at IZT, and maximum reverse leakage current of 0.25 mA at 54.4 V. It serves as a precision voltage reference and regulation element in high-reliability power supply feedback loops.
For engineers reviewing the 1N3040BUR-1/TR datasheet, 1N3040BUR-1/TR pinout, 1N3040BUR-1/TR application, or 1N3040BUR-1/TR equivalent, key selection criteria include its ±5% Zener tolerance (B-grade), -55 °C to +175 °C operating junction temperature range, 50 °C/W thermal resistance junction-to-end cap, and suitability for military-grade (JANTXV-qualified) and radiation-hardened designs per MicroNote 050.
Technical Context
This device implements a glass-encapsulated, double-plug Zener structure with metallurgically enhanced internal contact design, enabling low thermal resistance and stable breakdown characteristics across wide temperature excursions. Its DO-213AB MELF geometry provides low parasitic inductance and capacitance, supporting high-frequency regulation stability.
Rated for 1 W dissipation with linear derating from 125 °C to zero at 175 °C, the 1N3040BUR-1/TR operates with a Zener knee current (IZK) of 14 mA and exhibits a temperature coefficient of +0.104 %/°C - confirming positive VZ drift with temperature, critical for thermal compensation design in closed-loop systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V at 3.7 mA test current - defines nominal regulation point under standard bias conditions |
| Power Dissipation (PD) | 1.0 W - maximum continuous DC power handling at TEC ≤125 °C, derated linearly to zero at 175 °C |
| Zener Impedance (ZZT) | 150 Ω at IZT - small-signal AC impedance affecting regulation accuracy under dynamic load changes |
| Reverse Leakage (IR) | 0.25 mA at 54.4 V - ensures minimal shunt current in standby or low-current regulation modes |
| Junction Temperature Range | -55 °C to +175 °C - supports operation in extended industrial, aerospace, and downhole environments |
| Thermal Resistance (RθJEC) | 50 °C/W - enables thermal modeling of end-cap temperature rise under specified power loading |
| Forward Voltage (VF) | 1.2 V at 200 mA - relevant for forward-bias protection or clamping circuit analysis |
Pinout & Package
Package: DO-213AB (MELF/LL41), hermetically sealed glass cylindrical body with cathode band marking; axial coefficient of expansion ≈ +6 ppm/°C; weight ≈ 0.05 g; solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in reverse-bias regulation | Must be held negative relative to anode to enable Zener conduction; polarity critical for correct voltage reference orientation |
| Anode (non-banded end) | Cathode-side connection in reverse-bias regulation | Connected to regulated output node or feedback divider; forms reference return path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments (e.g., space, avionics) |
| Metallurgically bonded construction | Reduces thermal resistance and improves reliability over wire-bonded alternatives in high-power transients |
| JANTXV qualification | Fully compliant with MIL-PRF-19500/115 - certified for high-reliability defense and aerospace applications |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for satellite and nuclear instrumentation |
| Low ESD sensitivity | No special handling required - simplifies assembly and field service in electrostatic-prone environments |
Applications
| Avionics Power Regulation | Satellite Voltage Reference |
|---|---|
Use Scenario: Regulating auxiliary 28 V DC bus in flight control electronics with wide ambient temperature swings (-55 °C to +125 °C). IC Role / Device Role / Timing Role: Zener diode providing stable reference for error amplifier in isolated DC-DC converter feedback loop. Use Value: Maintains <±1.5% output regulation over full temperature range due to low αVZ (+0.104 %/°C) and hermetic stability. |
Use Scenario: Establishing precision bias point for radiation-hardened op-amps in star tracker analog front-end. IC Role / Device Role / Timing Role: Voltage reference element in low-noise, low-drift signal conditioning chain. Use Value: Delivers <0.25 mA leakage at 54.4 V and survives >100 krad(Si) total ionizing dose without parameter shift. |
| Downhole Oilfield Instrumentation | Military Radar Power Supply |
Use Scenario: Overvoltage clamping and reference stabilization in high-temperature (175 °C) logging tool power management. IC Role / Device Role / Timing Role: Primary Zener regulator in thermally coupled feedback network for high-voltage DC-DC stage. Use Value: Operates continuously at 175 °C junction temperature with verified 1 W derating curve and metallurgical bond integrity. |
Use Scenario: Precision voltage reference in pulse modulator supply for X-band radar transmitter stages. IC Role / Device Role / Timing Role: Stable 68 V reference for gate drive bias generation and fault detection thresholds. Use Value: Provides <150 Ω dynamic impedance to suppress switching noise coupling into sensitive timing circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3040UR-1 | Same Zener voltage (68 V), same DO-213AB package, but commercial-grade only (no JANTXV qualification); RoHS-compliant e3 finish available | Lacks MIL-PRF-19500/115 qualification - unsuitable for defense/aerospace programs requiring traceable military screening | Select when cost-sensitive commercial or industrial designs require identical electrical specs without military testing overhead |
| SMF68A | 68 V Zener in SOD-123FL package; 1 W rating; ±5% tolerance; 200 °C max junction temp; higher IR (1 µA @ 54.4 V) | Surface-mount plastic package - lower reliability, no hermetic seal or radiation hardness; not qualified to MIL-PRF-19500 | Choose for consumer or automotive applications where cost, board space, and reflow compatibility outweigh hermeticity and radiation requirements |
Compared with 1N3040UR-1 and SMF68A, the 1N3040BUR-1/TR uniquely combines JANTXV qualification, hermetic glass MELF construction, and proven radiation hardness - making it the only option for mission-critical systems where parameter stability under extreme thermal, mechanical, and radiation stress is non-negotiable.
Availability
1N3040BUR-1/TR is available at Aetrix Electronics and suitable for avionics power regulation, satellite voltage reference, and downhole oilfield instrumentation requiring stable component supply with full traceability and military-grade documentation.
Supply support for 1N3040BUR-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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The 1N3040BUR-1/TR belongs to Microsemi's legacy MIL-PRF-19500/115-qualified Zener diode family, engineered specifically for voltage regulation in defense, space, and extreme-environment electronics where long-term parametric stability and survivability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N3040BUR-1/TR?
The 1N3040BUR-1/TR has a nominal Zener voltage of 68 V with a ±5% tolerance (denoted by "B" in the part nomenclature), meaning its actual VZ falls between 64.6 V and 71.4 V at 3.7 mA test current and 25 °C. This tolerance is maintained across the full -55 °C to +175 °C operating range per MIL-PRF-19500/115 screening.
Is 1N3040BUR-1/TR suitable for high-temperature downhole applications?
Yes - the 1N3040BUR-1/TR is rated for continuous operation up to +175 °C junction temperature, with linear power derating from 125 °C to zero at 175 °C. Its hermetic glass construction and metallurgically bonded internals have been validated in oilfield logging tools operating at sustained 175 °C ambient with thermal cycling.
Does 1N3040BUR-1/TR meet RoHS requirements?
No - the 1N3040BUR-1/TR is a JANTXV-qualified military part with tin/lead terminal finish and is not RoHS compliant. RoHS-compliant versions (e3 suffix) are only available in commercial-grade variants such as 1N3040UR-1/e3, which lack MIL-PRF-19500/115 qualification.
What is the maximum reverse leakage current for 1N3040BUR-1/TR?
The maximum reverse leakage current (IR) for 1N3040BUR-1/TR is 0.25 mA measured at VR = 54.4 V (80% of nominal VZ) and 25 °C. This value remains stable across temperature and is verified per MIL-PRF-19500/115 test methods for JANTXV devices.
Can 1N3040BUR-1/TR be used in radiation-intensive environments like satellites?
Yes - the 1N3040BUR-1/TR is inherently radiation-hardened per Microsemi MicroNote 050, demonstrating no significant parameter shift after exposure to >100 krad(Si) total ionizing dose. Its hermetic glass package and metallurgical construction prevent radiation-induced degradation mechanisms common in plastic-packaged diodes.
1N3040BUR-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):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 51.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N3040BUR-1/TR FAQ
1.How can I place an order for 1N3040BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3040BUR-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 1N3040BUR-1/TR reliable?
The price and inventory of 1N3040BUR-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 1N3040BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N3040BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3040BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3040BUR-1/TR?
1N3040BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3040BUR-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 1N3040BUR-1/TR?
For technical support, including 1N3040BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3040BUR-1/TR requirements.
6.How does Aetrix verify that 1N3040BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N3040BUR-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 1N3040BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N3040BUR-1/TR?
All 1N3040BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3040BUR-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 1N3040BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N3040BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3040BUR-1/TR Tags
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