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Microchip Technology 1N5985UR/TR
- Part No.:
- 1N5985UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5985UR/TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,182
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Product details
Overview
1N5985UR/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 overvoltage protection circuits.
For engineers reviewing the 1N5985UR/TR datasheet, 1N5985UR/TR pinout, 1N5985UR/TR application, or 1N5985UR/TR equivalent, this page delivers verified electrical parameters, thermal derating behavior, RoHS-compliant packaging details, and direct alternatives for commercial-grade Zener regulation where stable 2.4 V reference and low leakage (<100 µA at 1.0 V) are required.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at nominal 2.4 V when biased above its knee current (IZK = 0.25 mA), with specified Zener impedance (ZZT = 1800 Ω at IZT = 100 mA) and temperature coefficient of –0.090 %/°C. It uses hermetically sealed glass construction with metallurgical end-cap bonding for reliability.
Designed for surface-mount assembly on FR4 PCBs with 1 oz copper, it exhibits thermal resistance junction-to-ambient of 300 °C/W and junction-to-end-cap of 150 °C/W, enabling operation from –65 °C to +175 °C. Its cathode band marking and tin-lead or matte-tin plating comply with MIL-STD-750 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V ±5% at 100 mA - defines stable regulation point under nominal bias; tolerance affects reference accuracy in feedback loops. |
| Power Dissipation (PD) | 0.5 W at 25°C ambient - sets maximum continuous power before thermal derating; requires layout-aware heatsinking above 100°C end-cap temp. |
| Zener Impedance (ZZT) | 1800 Ω at 100 mA - indicates output impedance in regulation region; impacts load regulation error and ripple rejection. |
| Reverse Leakage (IR) | ≤100 µA at 1.0 V - ensures minimal quiescent current in standby; critical for battery-powered voltage monitor circuits. |
| Temp. Coefficient (αVZ) | –0.090 %/°C - quantifies drift per degree; enables compensation design for wide-temperature industrial sensors. |
| Junction Temp. Range | –65 °C to +175 °C - supports operation in harsh environments including automotive under-hood and aerospace avionics. |
| Forward Voltage (VF) | 1.1 V at 200 mA - defines forward conduction drop; relevant for polarity protection or dual-function clamp applications. |
Pinout & Package
DO-213AA (SOD-80 / MELF) glass package: cylindrical hermetic body with metallized end caps; cathode identified by single black band; no polarity-specific PCB footprint asymmetry - bidirectional mounting allowed but cathode must connect to higher potential during regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connects to system ground or lower-potential rail; serves as return path for Zener current during regulation. |
| Cathode (banded end) | Regulated output node | Provides stable 2.4 V relative to anode; must be biased positive w.r.t. anode to enter breakdown and regulate. |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount DO-213AA (MELF) package | Enables high-reliability automated placement with hermetic glass seal and metallurgical end-cap bonds - eliminates wire-bond failure modes. |
| RoHS-compliant matte-tin plating | Supports lead-free reflow (260°C/10 s) without degradation; meets commercial-grade environmental compliance without derating. |
| Low capacitance (typ. <2 pF) | Minimizes high-frequency coupling in RF bias networks and fast-switching protection circuits - preserves signal integrity. |
| Radiation-hardened structure | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for space-qualified power supervisors and satellite subsystems. |
| ESD-insensitive (MIL-STD-750 Method 1020) | Withstands >4 kV HBM without parameter shift - simplifies handling and eliminates need for ESD-protected workstations in production. |
Applications
| Industrial Sensor Reference | Low-Power Voltage Monitor |
|---|---|
|
Use Scenario: Providing stable 2.4 V reference for 12-bit ADC in temperature transmitters operating from –40 °C to +85 °C. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise input scaling for analog front-end conditioning. Use Value: ±5% tolerance and –0.090 %/°C TC enable <±10 mV drift over full range - sufficient for 0.1% measurement accuracy. |
Use Scenario: Detecting brown-out condition in microcontroller reset circuit powered from 3.3 V rail. IC Role / Device Role / Timing Role: Zener clamping element in RC-based reset generator, triggering POR when supply drops below 2.4 V. Use Value: 100 µA max leakage at 1.0 V ensures minimal loading on weak bias sources - preserves timing accuracy of RC delay. |
| Overvoltage Clamp | Current-Source Bias |
|
Use Scenario: Protecting op-amp inputs against transient surges up to ±15 V in data acquisition front-ends. IC Role / Device Role / Timing Role: Bidirectional shunt limiter (with series resistor) clamping input voltage to ±2.4 V above/below reference. Use Value: 1800 Ω dynamic impedance limits peak clamp current to <8 mA during 100 ns transients - prevents op-amp damage. |
Use Scenario: Generating constant 100 µA bias current for JFET amplifier stages in audio preamplifiers. IC Role / Device Role / Timing Role: Current source formed by 2.4 V Zener in series with 24 kΩ resistor across 5 V supply. Use Value: Stable 2.4 V reference ensures <±0.5% current variation over temperature - maintains amplifier gain linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C2V4 | Same 2.4 V ±5%, but DO-35 axial package; 500 mW rating; ZZT = 120 Ω at 5 mA - lower impedance but lower test current. | Requires through-hole assembly; unsuitable for high-density SMT layouts; better for prototyping or legacy repair. | Select BZX55C2V4 only when board real estate allows axial leads and manual soldering is acceptable. |
| MMBZ5221BS | SOT-23 package; 2.4 V ±5%; 225 mW rating; ZZT = 30 Ω at 20 mA - significantly lower impedance but lower power handling. | Higher current density in smaller footprint; limited to ≤150 mW continuous dissipation; not radiation-hardened. | Choose MMBZ5221BS for space-constrained consumer electronics where radiation hardness and 500 mW headroom are unnecessary. |
Compared with BZX55C2V4 and MMBZ5221BS, the 1N5985UR/TR uniquely combines 500 mW SMT capability, DO-213AA hermetic reliability, –65 °C to +175 °C operation, and inherent radiation hardness - making it the only option for high-stability, high-reliability industrial and aerospace voltage references.
Availability
1N5985UR/TR is available at Aetrix Electronics and suitable for industrial sensor calibration, low-power voltage monitoring, and overvoltage protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5985UR/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 analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5985UR/TR belongs to Microsemi's legacy DO-213AA Zener diode product line, engineered for precision voltage regulation in mission-critical systems where hermetic sealing, wide temperature operation, and TID tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5985UR/TR?
The 1N5985UR/TR has a nominal Zener voltage of 2.4 V with ±5% tolerance, as indicated by the "B" suffix in its nomenclature per Microsemi's part numbering system. This means the actual VZ falls between 2.28 V and 2.52 V when measured at 100 mA test current and 30°C lead temperature, per the Electrical Characteristics table on page 3 of T4-LDS-0228-1.
Is 1N5985UR/TR RoHS compliant?
Yes, the 1N5985UR/TR is RoHS compliant, as confirmed by the "e3" designation in its full part number (1N5985BUR-1 includes e3 per nomenclature table). The device uses matte-tin plating on end caps and meets RoHS Directive 2011/65/EU requirements - applicable only to commercial-grade versions, not military-screened variants.
What is the maximum reverse leakage current for 1N5985UR/TR?
The maximum reverse leakage current (IR) for 1N5985UR/TR is 100 µA at 1.0 V reverse voltage and 30°C, as specified in the Electrical Characteristics table. This value applies to devices with B/C/D tolerance suffixes and confirms suitability for low-quiescent-current applications such as battery-backed voltage monitors.
Can 1N5985UR/TR be used in place of axial 1N5985B-1?
No - while electrically identical in voltage and tolerance, the 1N5985UR/TR uses a DO-213AA (MELF) surface-mount package, whereas the 1N5985B-1 uses DO-35 axial leads. They are not mechanically interchangeable; PCB layout, assembly process, and thermal paths differ significantly. The "UR" suffix explicitly denotes the surface-mount variant.
What is the thermal resistance of 1N5985UR/TR when mounted on FR4?
When mounted on FR4 PCB with 1 oz copper and Microsemi's recommended footprint, the 1N5985UR/TR has a thermal resistance junction-to-ambient (RθJA) of 300 °C/W and junction-to-end-cap (RθJL) of 150 °C/W. These values are defined in the Maximum Ratings table and govern derating above 25°C ambient per Figure 1.
1N5985UR/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/TR FAQ
1.How can I place an order for 1N5985UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5985UR/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/TR reliable?
The price and inventory of 1N5985UR/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/TR is usually 5 days.
3.What payment methods are accepted for 1N5985UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5985UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5985UR/TR?
1N5985UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5985UR/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/TR?
For technical support, including 1N5985UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5985UR/TR requirements.
6.How does Aetrix verify that 1N5985UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N5985UR/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/TR meets industry standards.
7.What is the process for return or replacement of 1N5985UR/TR?
All 1N5985UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5985UR/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/TR part is unused and in its original packaging.
Return procedure for 1N5985UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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