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Microchip Technology 1N5990UR/TR
- Part No.:
- 1N5990UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5990UR/TR.pdf
- Description:
- DIODE ZENER 3.9V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,575
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Product details
Overview
1N5990UR/TR from Microsemi is a surface-mount 3.9 V, 5% tolerance Zener diode in DO-213AA (SOD80) MELF package, rated for 500 mW power dissipation at 25°C, with 90 mA test current (IZT), 2400 Ω dynamic impedance (ZZT), and 10 µA reverse leakage at 1.0 V. It serves as a precision voltage reference or shunt regulator in low-power analog circuits.
For engineers reviewing the 1N5990UR/TR datasheet, 1N5990UR/TR pinout, 1N5990UR/TR application, or 1N5990UR/TR equivalent, this part supports stable voltage regulation across industrial temperature ranges (–65°C to +175°C), requires no external biasing, and delivers predictable breakdown behavior under controlled reverse-bias conditions.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 3.9 V at 90 mA test current (IZT), exhibiting a typical temperature coefficient of –0.045 %/°C. Its DO-213AA glass MELF package ensures hermetic sealing and high reliability under thermal cycling.
It features metallurgically bonded end caps, RoHS-compliant matte-tin plating (commercial grade), and minimal junction capacitance-typical values fall below 10 pF per Figure 2 of the datasheet. Reverse leakage remains ≤10 µA at VR = 1.0 V, supporting low-power standby regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V at IZT = 90 mA - defines precise regulation point for feedback or reference circuits. |
| Power Dissipation (PD) | 0.5 W at 25°C ambient - sets maximum continuous power handling on FR4 board with standard footprint. |
| Zener Impedance (ZZT) | 2400 Ω at IZT = 90 mA - indicates voltage stability under small-signal AC modulation near regulation point. |
| Reverse Leakage (IR) | ≤10 µA at VR = 1.0 V - ensures negligible quiescent current draw in standby or low-current bias networks. |
| Operating Temperature | –65°C to +175°C - enables use in extended industrial, aerospace, and downhole environments. |
| Package | DO-213AA (SOD80/MELF) - glass-encapsulated surface-mount form factor with axial symmetry and high thermal reliability. |
Pinout & Package
DO-213AA (SOD80) MELF package: hermetically sealed glass cylinder with two metallized end caps; cathode identified by single black band; polarity critical-banded end must be biased positive relative to opposite end for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential rail; reverse-biased to maintain fixed 3.9 V drop across load. |
| Anode (unbanded end) | Reference/return node | Typically tied to circuit ground or lower-potential rail; completes Zener conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount MELF construction | Enables automated placement and reflow soldering while maintaining hermeticity and thermal robustness. |
| 5% Zener voltage tolerance (B suffix) | Guarantees VZ between 3.71 V and 4.09 V at IZT, suitable for cost-sensitive yet stable reference designs. |
| Low reverse leakage (≤10 µA @ 1.0 V) | Minimizes error in high-impedance bias networks and extends battery life in portable regulation applications. |
| Radiation-hardened design | Inherently tolerant to total ionizing dose (TID), per Microsemi MicroNote 050-valid for space-grade screening variants. |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 3.9 V reference for comparator or op-amp input. Use Value: Maintains ±5% output accuracy over –65°C to +125°C ambient without trimming or calibration. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when voltage exceeds 3.9 V. Use Value: Limits peak voltage to safe levels with <10 µA leakage at 1.0 V, preserving signal integrity during normal operation. |
| Temperature-Stable Bias Network | Low-Power Sensor Excitation |
Use Scenario: Generating stable bias current for precision op-amp input stages in instrumentation amplifiers. IC Role / Device Role / Timing Role: Zener-based current source where 3.9 V drop across series resistor sets bias level. Use Value: Delivers <±0.05%/°C drift over operating range, reducing thermal drift in measurement front-ends. |
Use Scenario: Providing excitation voltage to resistive sensors (e.g., RTDs, thermistors) in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator supplying fixed 3.9 V to sensor bridge. Use Value: Draws only ≤10 µA in standby, enabling multi-year operation on coin-cell batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C3V9 | Same 3.9 V nominal, 5% tolerance, but in DO-35 axial package; higher ZZT (~3000 Ω); non-RoHS default. | Requires through-hole PCB layout; less suitable for high-density SMT assemblies. | Select when legacy axial footprint compatibility or MIL-STD-750 ESD testing compliance is required. |
| MMBZ5227BS | SOT-23 package; same 3.9 V/5%; lower PD (200 mW); ZZT = 17 Ω - significantly lower impedance. | Higher current capability not needed; better for low-noise, high-stability references where low ZZT matters. | Choose for compact SMT designs needing tighter regulation under varying load, accepting reduced power rating. |
Compared with BZX55-C3V9 and MMBZ5227BS, the 1N5990UR/TR offers superior thermal reliability in MELF glass packaging, wider temperature range support (–65°C to +175°C), and inherent radiation hardness-making it preferred for mission-critical industrial and aerospace regulation where long-term stability outweighs ultra-low impedance needs.
Availability
1N5990UR/TR is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and low-power sensor excitation applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for 1N5990UR/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 1N5990UR/TR belongs to Microsemi's legacy 1N5985BUR–1N6031BUR Zener series, designed specifically for surface-mount voltage regulation in harsh-environment systems where hermetic sealing, wide temperature operation, and MIL-PRF-19500 screening compatibility are essential.
FAQ
What is the Zener voltage tolerance for 1N5990UR/TR?
The "B" in the suffix denotes a 5% Zener voltage tolerance. For 1N5990UR/TR, this means the measured VZ at IZT = 90 mA falls between 3.71 V and 4.09 V. This tolerance is guaranteed across the full operating temperature range and is verified per JEDEC test methods described in the T4-LDS-0228-1 datasheet.
Is 1N5990UR/TR RoHS compliant?
Yes, the "e3" RoHS compliance designation applies to commercial-grade 1N5990UR/TR devices, which feature matte-tin plating on end caps. RoHS compliance is explicitly confirmed in the part nomenclature section of the datasheet and verified per EU Directive 2011/65/EU. Military-screened variants are not RoHS compliant.
What does the "TR" suffix indicate in 1N5990UR/TR?
The "TR" suffix specifies tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format enables automated pick-and-place assembly. The datasheet confirms TR ordering is standard for commercial versions and requires consultation with Microsemi for minimum order quantities and reel configurations.
Can 1N5990UR/TR be used in place of axial 1N5990B?
No-1N5990UR/TR uses the DO-213AA (SOD80) MELF surface-mount package, whereas 1N5990B uses the DO-35 axial-leaded package. They share identical electrical specifications (VZ, IZT, tolerance), but mechanical mounting, thermal paths, and PCB footprint differ fundamentally. Direct substitution requires layout redesign.
What is the maximum Zener current (IZM) for 1N5990UR/TR?
Per the Electrical Characteristics table on page 3 of T4-LDS-0228-1, the maximum dc Zener current IZM for 1N5990UR/TR is 95 mA. This value is derived from the 0.5 W power rating and the upper limit of the 5% tolerance band (VZM = 4.09 V), ensuring safe operation within thermal limits on FR4 PCBs with recommended pad layout.
1N5990UR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±20%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5990UR/TR FAQ
1.How can I place an order for 1N5990UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5990UR/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 1N5990UR/TR reliable?
The price and inventory of 1N5990UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5990UR/TR is usually 5 days.
3.What payment methods are accepted for 1N5990UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5990UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5990UR/TR?
1N5990UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5990UR/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 1N5990UR/TR?
For technical support, including 1N5990UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5990UR/TR requirements.
6.How does Aetrix verify that 1N5990UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N5990UR/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 1N5990UR/TR meets industry standards.
7.What is the process for return or replacement of 1N5990UR/TR?
All 1N5990UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5990UR/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 1N5990UR/TR part is unused and in its original packaging.
Return procedure for 1N5990UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5990UR/TR Tags
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