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Microchip Technology 1N5999UR-1/TR
- Part No.:
- 1N5999UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5999UR-1/TR.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
1N5999UR-1/TR from Microsemi is a surface-mount 500 mW Zener diode with nominal Zener voltage of 9.1 V, ±5% tolerance (B suffix), 5 mA test current, and 600 Ω dynamic impedance at IZT. It operates in the DO-213AA (SOD80/MLL34) MELF glass package and regulates voltage across industrial power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5999UR-1/TR datasheet, 1N5999UR-1/TR pinout, 1N5999UR-1/TR application, or 1N5999UR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (RθJA = 300 °C/W), junction temperature range (–65 to +175 °C), RoHS compliance status, and DO-213AA footprint compatibility.
Technical Context
This device functions as a two-terminal voltage reference by operating in reverse breakdown, maintaining stable output voltage under varying load and temperature conditions. Its 9.1 V nominal regulation point, +0.061 %/°C temperature coefficient, and low 0.1 µA leakage at 7.0 V support precision biasing in analog front-ends and feedback networks.
The DO-213AA hermetically sealed glass package enables high reliability in harsh environments, with metallurgical bonding ensuring robust thermal performance and ESD insensitivity per MIL-STD-750 Method 1020. It is rated for 0.5 W dissipation at 25 °C ambient on FR4 board with 1 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at 5 mA - defines stable regulation point for feedback loops and reference rails. |
| Power Dissipation (PD) | 0.5 W at 25 °C - sets maximum continuous power handling on standard FR4 PCB layout. |
| Dynamic Impedance (ZZT) | 600 Ω at 5 mA - determines output voltage variation under load transients; lower values improve regulation. |
| Junction Temperature Range | –65 to +175 °C - supports operation in extended industrial and aerospace environments without derating. |
| Thermal Resistance (RθJA) | 300 °C/W - informs heatsinking requirements; requires minimum 1 oz Cu pad for rated power. |
| Reverse Leakage (IR) | 0.1 µA at 7.0 V - ensures minimal quiescent current draw in high-impedance sensing paths. |
| Forward Voltage (VF) | 1.1 V at 200 mA - relevant for polarity verification and ESD-safe forward-bias testing. |
Pinout & Package
DO-213AA (SOD80 / MLL34) MELF glass package: cylindrical hermetically sealed body with tin-lead or RoHS-compliant matte-tin end-cap plating; cathode indicated by single black band; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node in Zener regulator configuration | Connected to system ground or lower-potential rail; forms return path for Zener current. |
| Cathode (banded end) | Regulated output node | Provides stable 9.1 V reference when reverse-biased; must be held at higher potential than anode. |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount DO-213AA package | Enables automated assembly and high-density PCB layouts while maintaining hermetic reliability. |
| ±5% Zener voltage tolerance (B suffix) | Meets tight regulation requirements for feedback references without requiring post-calibration. |
| Low 0.1 µA reverse leakage at 7.0 V | Minimizes error in high-impedance voltage divider networks and sensor biasing circuits. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space-qualified and high-reliability systems. |
| ESD-insensitive per MIL-STD-750 Method 1020 | Eliminates need for external ESD protection in handling and board-level integration. |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode provides precise 9.1 V reference for optocoupler-based error amplifier input. Use Value: Maintains ±1% output regulation across –40 to +105 °C ambient with <10 mV drift due to its +0.061 %/°C tempco. |
Use Scenario: Clamping transient surges on 12 V automotive control bus lines. IC Role / Device Role / Timing Role: Shunts excess energy to ground when line voltage exceeds 9.1 V, protecting downstream logic. Use Value: Responds within nanoseconds to fast transients; 0.5 W rating handles repetitive 100 ns pulses up to 500 mW peak. |
| High-Reliability Sensor Biasing | Programmable Threshold Detector |
|
Use Scenario: Providing stable excitation voltage for RTD or strain gauge Wheatstone bridges in oil & gas monitoring. IC Role / Device Role / Timing Role: Serves as low-drift, low-noise voltage source for bridge excitation in analog signal chains. Use Value: 600 Ω ZZT and 0.1 µA leakage ensure bridge imbalance errors remain below 0.05% full scale. |
Use Scenario: Setting trip point for comparator-based battery undervoltage lockout at 9.1 V threshold. IC Role / Device Role / Timing Role: Defines exact switching threshold via resistor-divider bias into comparator reference pin. Use Value: ±5% tolerance ensures predictable activation margin; DO-213AA package allows placement near comparator IC for noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5239B | Same 9.1 V nominal, but DO-35 axial package; RθJA = 500 °C/W; no RoHS option. | Requires through-hole assembly; unsuitable for high-density SMT designs or automated reflow. | Select only if legacy through-hole compatibility or manual prototyping is required. |
| BZX55C9V1 | 9.1 V ±5%, DO-35, 500 mW, but higher ZZT = 800 Ω; tempco +0.065 %/°C; non-hermetic epoxy. | Limited to commercial-grade environments; not qualified to MIL-PRF-19500 or radiation-hardened use cases. | Acceptable for cost-sensitive consumer applications where hermeticity and radiation tolerance are unnecessary. |
Compared with 1N5999UR-1/TR, 1N5239B offers identical electrical specs but inferior thermal performance and no SMT capability, while BZX55C9V1 trades reliability and low-impedance regulation for lower cost and wider commercial availability.
Availability
1N5999UR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive overvoltage clamps, high-reliability sensor interfaces, and programmable threshold detectors requiring stable component supply and long-term obsolescence management.
Supply support for 1N5999UR-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 1N5999UR-1/TR belongs to Microsemi's legacy MIL-PRF-19500-qualified Zener diode family, designed for precision voltage regulation in mission-critical military, space, and industrial systems where stability, hermeticity, and long-term reliability are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5999UR-1/TR?
The 1N5999UR-1/TR has a nominal Zener voltage of 9.1 V with ±5% tolerance, denoted by the "B" suffix in its part number. This means the actual measured VZ at 5 mA test current falls between 8.65 V and 9.56 V across the full operating temperature range.
Is the 1N5999UR-1/TR RoHS compliant?
Yes - the "e3" RoHS compliance indicator is included in the full part number 1N5999UR-1/TR-e3 (though often omitted in shorthand). RoHS-compliant matte-tin end-cap plating is available for commercial-grade units; military-screened versions use tin-lead.
What does the "TR" suffix mean in 1N5999UR-1/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format supports automated pick-and-place assembly and is the standard shipping configuration for volume orders of the 1N5999UR-1/TR.
Can the 1N5999UR-1/TR replace the 1N5239B in a design?
No - while both regulate at 9.1 V, the 1N5999UR-1/TR uses a DO-213AA surface-mount package versus the DO-35 axial package of the 1N5239B. The 1N5999UR-1/TR also offers superior thermal resistance (300 vs. 500 °C/W) and hermetic construction, making direct substitution mechanically and thermally invalid without PCB redesign.
What is the maximum Zener current (IZM) for the 1N5999UR-1/TR?
The maximum dc Zener current for the 1N5999UR-1/TR is 18 mA, calculated from PD/VZ(min) = 0.5 W / 8.65 V. This value assumes worst-case voltage tolerance and defines the upper limit for continuous regulation without exceeding power rating.
1N5999UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5999UR-1/TR FAQ
1.How can I place an order for 1N5999UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5999UR-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 1N5999UR-1/TR reliable?
The price and inventory of 1N5999UR-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 1N5999UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5999UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5999UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5999UR-1/TR?
1N5999UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5999UR-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 1N5999UR-1/TR?
For technical support, including 1N5999UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5999UR-1/TR requirements.
6.How does Aetrix verify that 1N5999UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5999UR-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 1N5999UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5999UR-1/TR?
All 1N5999UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5999UR-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 1N5999UR-1/TR part is unused and in its original packaging.
Return procedure for 1N5999UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5999UR-1/TR Tags
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MM5Z5V1ST1G
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