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Microchip Technology 1N5949BUR-1/TR
- Part No.:
- 1N5949BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5949BUR-1/TR.pdf
- Description:
- DIODE ZENER 100V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,305
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Product details
Overview
1N5949BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 100 V Zener voltage at 3.7 mA test current, with 10% tolerance, 250 Ω dynamic impedance, and 15 mA maximum Zener current. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5949BUR-1/TR datasheet, 1N5949BUR-1/TR pinout, 1N5949BUR-1/TR application, or 1N5949BUR-1/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (RθJA = 120 °C/W), hermetic glass packaging, MIL-PRF-19500 screening availability, and RoHS compliance (e3 suffix).
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with specified knee current (IZK = 0.25 mA) and knee impedance (ZZK = 250 Ω). Its metallurgically bonded tungsten slug construction ensures low thermal resistance (RθJEC = 40 °C/W) and enhanced reliability under thermal cycling.
The DO-213AB MELF package enables low parasitic capacitance (typ. 3 pF at 100 V, per Figure 2), non-ESD-sensitive operation (per MIL-STD-750 Method 1020), and inherent radiation hardness per MicroNote 050 - making it suitable for aerospace and industrial environments where long-term stability and hermeticity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 100 V ±10% at IZT = 3.7 mA - defines nominal regulation point with predictable deviation across temperature and current |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - sets maximum steady-state thermal load before derating begins |
| Dynamic Impedance (ZZT) | 250 Ω at IZT = 3.7 mA - determines output voltage variation under changing load current |
| Max Zener Current (IZM) | 15 mA - limits safe continuous conduction in regulation mode without exceeding PD |
| Junction Temp Range | –65 °C to +175 °C - supports operation in extended industrial and aerospace ambient conditions |
| Thermal Resistance (RθJA) | 120 °C/W on FR4 (1 oz Cu) - informs PCB layout cooling requirements for thermal management |
| Reverse Leakage (IR) | 1 µA max at VR = 76 V - ensures minimal standby power loss in high-impedance bias networks |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed voidless hard glass body with tungsten slugs; cathode indicated by single band; tin/lead or RoHS-compliant matte tin plating; weight ≈ 0.05 g; dimensions BD = 2.39–2.67 mm, BL = 4.80–5.21 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation; requires no external connection beyond circuit path |
| Cathode (banded end) | Zener breakdown terminal | Connected to higher-potential node; voltage regulation occurs between cathode and anode when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance (RθJEC = 40 °C/W) and improves long-term reliability under thermal stress |
| Hermetically sealed glass construction | Prevents moisture ingress and parameter drift over time - critical for mission-critical and space-grade applications |
| MIL-PRF-19500 screening option | Enables qualification for military/aerospace programs requiring standardized reliability testing and lot traceability |
| Low parasitic capacitance | ~3 pF (per Figure 2) - preserves signal integrity in high-frequency bias and reference networks |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
Applications
| Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stable 100 V reference in isolated DC-DC converter feedback networks and precision voltage monitors. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed reference voltage independent of load current within 3.7–15 mA range. Use Value: Maintains ±10% regulation accuracy across –65 °C to +175 °C, enabling robust closed-loop control without active compensation. | Use Scenario: Clamping transient surges on 85–100 V bus lines in industrial motor drives and telecom power systems. IC Role / Device Role / Timing Role: Passive crowbar element that conducts above 100 V to divert excess energy and protect downstream MOSFETs or controllers. Use Value: Hermetic glass package withstands repeated surge events without parameter shift; 1.5 W rating sustains clamping for short-duration transients. |
| High-Reliability Bias Network | Radiation-Hardened Sensor Interface |
Use Scenario: Providing stable bias to op-amps and ADC references in avionics data acquisition modules. IC Role / Device Role / Timing Role: Low-noise, low-capacitance (3 pF) voltage reference source with negligible leakage (<1 µA at 76 V). Use Value: Metallurgical bond and glass seal prevent parameter drift under vibration and thermal cycling - essential for flight-critical analog front-ends. | Use Scenario: Regulating supply to radiation-tolerant sensors in satellite payload telemetry chains. IC Role / Device Role / Timing Role: Radiation-hardened (per MicroNote 050) Zener reference maintaining regulation after total ionizing dose exposure. Use Value: Inherent hardness eliminates need for shielding or redundant regulation - reduces SWaP-C in constrained orbital platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5949B | Same electrical specs but axial DO-41 package; no TR tape-and-reel; non-surface-mount | Requires through-hole PCB assembly; higher parasitic inductance; unsuitable for high-density layouts | Select when legacy board repair or manual prototyping demands axial form factor and hand-soldering compatibility |
| SMBG5949B | Same VZ, tolerance, and power rating but in SMB package; RθJA = 100 °C/W; higher capacitance (~10 pF) | Better thermal performance on PCB but larger footprint; less suitable for RF-sensitive bias nodes | Select when automated SMT volume production prioritizes thermal margin over ultra-low capacitance or hermeticity |
Compared with 1N5949BUR-1/TR, the 1N5949B offers mechanical compatibility with legacy designs but lacks surface-mount efficiency, while SMBG5949B improves thermal dissipation at the cost of hermetic sealing and higher parasitic capacitance - making the original MELF variant optimal for high-reliability, space-constrained, or radiation-exposed applications.
Availability
1N5949BUR-1/TR is available at Aetrix Electronics and suitable for high-density power supply references, overvoltage clamp circuits, radiation-hardened sensor interfaces, and MIL-PRF-19500-compliant avionics subsystems requiring stable component supply across extended temperature and lifetime requirements.
Supply support for 1N5949BUR-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 analog and discrete components.
The 1N59xxBUR series belongs to Microsemi's metallurgically bonded MELF Zener family, designed specifically for applications demanding hermeticity, long-term parametric stability, and compliance with military screening standards like MIL-PRF-19500.
FAQ
What is the Zener voltage tolerance for 1N5949BUR-1/TR?
The 1N5949BUR-1/TR has a Zener voltage tolerance of ±10%, meaning its regulated voltage falls between 90 V and 110 V at the specified test current of 3.7 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the T4-LDS-0300-1 datasheet and applies across the full operating temperature range of –65 °C to +175 °C. The 1N5949BUR-1/TR maintains this specification under standard mounting conditions on FR4 PCB with recommended pad layout.
Is 1N5949BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full part number 1N5949BUR-1/TR indicates RoHS compliance per EU Directive 2011/65/EU. The device uses matte tin plating over copper terminals and meets lead-free soldering requirements up to 260 °C for 10 seconds. This is explicitly stated in the Part Nomenclature section (page 2) and confirmed in the Mechanical and Packaging description of the T4-LDS-0300-1 datasheet.
What does the "TR" suffix mean in 1N5949BUR-1/TR?
The "TR" suffix denotes tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape - intended for automated SMT placement. This is documented in the Mechanical and Packaging section (page 2), which specifies that TR is the standard option for surface-mount variants and requires consultation with the factory for minimum order quantities. The 1N5949BUR-1/TR is not supplied in bulk or ammo pack formats.
Can 1N5949BUR-1/TR be used in radiation-intensive environments?
Yes, the 1N5949BUR-1/TR is inherently radiation-hardened as described in Microsemi MicroNote 050, due to its hermetically sealed glass package and metallurgically bonded construction. It has been characterized for total ionizing dose (TID) resilience and is qualified for use in satellite telemetry, nuclear instrumentation, and other high-radiation settings without additional shielding or derating - a key differentiator from plastic-packaged Zeners.
What is the maximum reverse leakage current for 1N5949BUR-1/TR?
The maximum reverse leakage current (IR) for 1N5949BUR-1/TR is 1 µA at a reverse voltage (VR) of 76 V, as specified in the Electrical Characteristics table (page 3). This value is measured at TEC = 25 °C and reflects the device's ability to maintain high impedance below breakdown - critical for low-power bias networks where quiescent current must remain minimal.
1N5949BUR-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):
- 100 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 76 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N5949BUR-1/TR FAQ
1.How can I place an order for 1N5949BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5949BUR-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 1N5949BUR-1/TR reliable?
The price and inventory of 1N5949BUR-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 1N5949BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5949BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5949BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5949BUR-1/TR?
1N5949BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5949BUR-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 1N5949BUR-1/TR?
For technical support, including 1N5949BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5949BUR-1/TR requirements.
6.How does Aetrix verify that 1N5949BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5949BUR-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 1N5949BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5949BUR-1/TR?
All 1N5949BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5949BUR-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 1N5949BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5949BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5949BUR-1/TR Tags
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