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Microchip Technology 1N5985UR-1/TR
- Part No.:
- 1N5985UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5985UR-1/TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,944
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Product details
Overview
1N5985UR-1/TR from Microsemi is a surface-mount 2.4 V, 5% tolerance Zener diode in DO-213AA (SOD-80) MELF package, rated for 500 mW power dissipation at 25°C, with 100 mA test current and 1800 Ω dynamic impedance, used for precision voltage regulation in low-power analog reference and bias circuits.
For engineers reviewing the 1N5985UR-1/TR datasheet, 1N5985UR-1/TR pinout, 1N5985UR-1/TR application, or 1N5985UR-1/TR equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (300 °C/W), reverse leakage (100 µA @ 1.0 V), junction temperature range (–65 to +175 °C), and RoHS-compliant matte-tin plating.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at precisely 2.4 V when biased above its knee current (IZK = 0.25 mA) and tested at 100 mA (IZT). Its glass-encapsulated DO-213AA package provides hermetic sealing and inherent radiation hardness per MicroNote 050.
It exhibits a negative temperature coefficient of –0.090 %/°C, low typical capacitance (<2 pF per Figure 2), and non-ESD-sensitive behavior per MIL-STD-750 Method 1020 - enabling stable operation across industrial temperature extremes without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V ±5% at 100 mA - defines nominal regulation point with tight tolerance for reference stability |
| Power Dissipation (PD) | 0.5 W at 25°C ambient - sets maximum continuous power handling on FR4 board with 1 oz Cu |
| Dynamic Impedance (ZZT) | 1800 Ω at 100 mA - indicates regulation stiffness; lower values improve load regulation |
| Reverse Leakage (IR) | 100 µA max at 1.0 V - ensures minimal error current in high-impedance bias networks |
| Junction Temp Range | –65 to +175 °C - supports operation in harsh environments including aerospace and downhole electronics |
| Thermal Resistance (RθJA) | 300 °C/W - determines temperature rise under load; requires thermal pad design for sustained 500 mW |
Pinout & Package
DO-213AA (SOD-80 / MLL34) MELF glass package: hermetically sealed cylindrical 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 conduction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward anode / Zener cathode return | Connected to circuit ground or lower potential node during regulation |
| Cathode (banded end) | Zener regulation terminal | Applied to regulated voltage node; reverse-biased to maintain 2.4 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount MELF construction | Enables automated placement and reflow compatibility while maintaining hermetic reliability |
| Internal metallurgical bonds | Eliminates wire bonds to improve mechanical robustness and long-term parameter stability |
| Radiation-hardened design | Inherently tolerant to total ionizing dose (TID), validated per MicroNote 050 for space-grade use |
| Low ESD sensitivity | Passes MIL-STD-750 Method 1020 without external protection, reducing BOM count |
| RoHS-compliant option | Matte-tin end-cap plating available for commercial grade - meets EU Directive 2011/65/EU |
Applications
| Industrial Sensor Signal Conditioning | Medical Instrument Reference Supply |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 2.4 V bias to Wheatstone bridge. Use Value: Tight 5% tolerance and –0.090 %/°C tempco ensure <±2 mV drift over –40 to +85 °C operating range. |
Use Scenario: Generating precise low-current reference for analog front-end amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Low-noise Zener regulator supplying clean 2.4 V to op-amp bias networks. Use Value: 100 µA max reverse leakage prevents loading of high-impedance sensor paths and preserves SNR. |
| Aerospace Power Sequencing | Test & Measurement Calibration |
Use Scenario: Enabling voltage threshold detection in satellite power management units during cold-start sequencing. IC Role / Device Role / Timing Role: Zener-clamped comparator input establishing reliable 2.4 V trip point. Use Value: Radiation hardness and –65 to +175 °C junction rating support unmitigated operation in LEO missions. |
Use Scenario: Serving as traceable voltage standard in handheld multimeter internal reference chains. IC Role / Device Role / Timing Role: Primary shunt reference in 3½-digit DMM auto-zero and ADC bias subsystems. Use Value: Hermetic DO-213AA package ensures long-term calibration stability with <50 ppm/year drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5985B-1 | Axial DO-35 package; identical electrical specs but higher RθJA (~400 °C/W); no tape-and-reel option | Suitable for prototyping or through-hole boards; not compatible with SMT lines | Select when manual assembly or legacy board compatibility is required |
| BZX55C2V4 | Pro Electron equivalent; same 2.4 V/5% spec but higher ZZT (2000 Ω); RoHS-only; no military screening path | Limited to commercial-grade industrial use; lacks radiation hardness documentation | Choose for cost-sensitive consumer designs where radiation tolerance is unnecessary |
Compared with 1N5985UR-1/TR, the 1N5985B-1 offers identical regulation performance but requires PCB layout change for through-hole mounting, while the BZX55C2V4 trades radiation hardness and hermeticity for lower unit cost in non-critical applications.
Availability
1N5985UR-1/TR is available at Aetrix Electronics and suitable for industrial sensor conditioning, medical instrument reference supplies, and aerospace power sequencing requiring stable component supply, full traceability, and extended temperature capability.
Supply support for 1N5985UR-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 ultra-low-power analog and mixed-signal components.
The 1N5985UR-1/TR belongs to Microsemi's legacy DO-213AA Zener series designed for mission-critical voltage regulation in aerospace, defense, and industrial systems demanding hermetic reliability and wide-temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5985UR-1/TR?
The 1N5985UR-1/TR has a nominal Zener voltage of 2.4 V with a ±5% tolerance, meaning its actual regulation voltage falls between 2.28 V and 2.52 V when tested at 100 mA (IZT) and 30°C lead temperature. This tolerance is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0228-1 Rev. 1, under the "B" suffix column for 1N5985BUR.
Is the 1N5985UR-1/TR RoHS compliant?
Yes, the 1N5985UR-1/TR is RoHS compliant, as indicated by the "e3" suffix in its full nomenclature (1N5985BUR-1 e3). Per the datasheet, RoHS-compliant matte-tin plating is available for commercial-grade devices only, and this version meets EU Directive 2011/65/EU requirements.
What package type does the 1N5985UR-1/TR use?
The 1N5985UR-1/TR uses the DO-213AA package - also known as SOD-80 or MLL34 - a hermetically sealed glass MELF (Metal Electrode Leadless Face) surface-mount package. Its dimensions are specified on page 5: diameter 1.60–1.70 mm, length 3.30–3.70 mm, with cathode marked by a single black band.
What is the maximum reverse leakage current for the 1N5985UR-1/TR?
The maximum reverse leakage current (IR) for the 1N5985UR-1/TR is 100 µA at VR = 1.0 V, as specified in the Electrical Characteristics table on page 3 of the datasheet. This value applies under standard test conditions of 30°C lead temperature and is critical for minimizing error in high-impedance reference circuits.
Does the 1N5985UR-1/TR support military-grade screening?
No - the 1N5985UR-1/TR is the commercial-grade version. Military screening (e.g., JAN, JANTX, JANTXV, JANS) requires prefix identifiers (MQ, MX, MV, CDS) per the Part Nomenclature section on page 2. The "UR" suffix denotes surface-mount packaging, and absence of a prefix confirms commercial-only qualification per MIL-PRF-19500.
1N5985UR-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):
- 2.4 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
1N5985UR-1/TR FAQ
1.How can I place an order for 1N5985UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5985UR-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 1N5985UR-1/TR reliable?
The price and inventory of 1N5985UR-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 1N5985UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5985UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5985UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5985UR-1/TR?
1N5985UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5985UR-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 1N5985UR-1/TR?
For technical support, including 1N5985UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5985UR-1/TR requirements.
6.How does Aetrix verify that 1N5985UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5985UR-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 1N5985UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5985UR-1/TR?
All 1N5985UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5985UR-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 1N5985UR-1/TR part is unused and in its original packaging.
Return procedure for 1N5985UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5985UR-1/TR Tags
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