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Microchip Technology 1N4120UR/TR
- Part No.:
- 1N4120UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4120UR/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,956
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Product details
Overview
1N4120UR/TR from Microsemi is a 30 V, ±5% tolerance, 0.5 W glass-encapsulated Zener diode in DO-213AA (SOD-80/MELF) surface-mount package, rated for operation from −65 °C to +175 °C and used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4120UR/TR datasheet, 1N4120UR/TR pinout, 1N4120UR/TR application, or 1N4120UR/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant plating details, and JEDEC-registered compatibility with legacy 1N4120 axial-leaded equivalents.
Technical Context
The 1N4120UR/TR operates as a two-terminal voltage reference device with cathode-banded polarity, requiring reverse-bias connection where the banded end is positive relative to the anode. Its Zener test current is fixed at 250 mA, and its dynamic impedance is 200 Ω at that condition.
It exhibits a typical temperature coefficient of +0.085 %/°C, indicating positive drift above 25 °C, and delivers low noise density (13 μV/√Hz) at IZT, making it suitable for stable analog references where thermal stability and low AC perturbation are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V ±5% - defines regulated output voltage under 250 mA test current and thermal equilibrium |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous DC power handling on FR4 board with recommended footprint |
| Zener Impedance | 200 Ω @ IZT = 250 mA - determines regulation stiffness and load-induced voltage deviation |
| Reverse Leakage Current | ≤0.01 μA @ VR = 22.8 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Noise Density | 13 μV/√Hz @ IZT - quantifies broadband AC noise contribution to reference voltage stability |
| Operating Temperature | −65 °C to +175 °C - supports deployment in aerospace, downhole, and industrial environments without derating |
| Forward Voltage | 1.1 V @ 200 mA - defines conduction threshold when used in forward-biased clamp or protection roles |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass package with axial symmetry and cathode band marking; no discrete pins-device has two metallized end-cap terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential during Zener operation; defines polarity for reverse-bias regulation |
| Anode (unbanded end) | Reference return node | Typically tied to system ground or lower-potential rail; completes Zener current path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and eliminates moisture-induced parameter shift over time |
| RoHS-compliant matte-tin plating | Supports lead-free reflow soldering at 260 °C for 10 s without degradation |
| JEDEC-registered 1N4120 equivalence | Allows drop-in replacement for legacy through-hole designs using DO-35/DO-7 packages |
| Low 13 μV/√Hz noise density | Minimizes voltage reference jitter in precision ADC biasing and analog sensor excitation |
| Radiation-hardened per MicroNote 050 | Validated for total ionizing dose (TID) resilience in space-grade and nuclear instrumentation |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter error amplifier loop. IC Role / Device Role / Timing Role: Zener diode providing precise 30 V reference for optocoupler-based secondary-side regulation. Use Value: Maintains ±0.5% output voltage accuracy across −40 °C to +125 °C ambient due to low tempco and hermetic sealing. | Use Scenario: Overvoltage protection on avionics bus monitoring circuitry. IC Role / Device Role / Timing Role: Clamping transient spikes above 30 V to safeguard downstream ADC inputs and microcontroller I/O. Use Value: Survives 175 °C soak and radiation exposure while delivering sub-10 nA leakage at 90% of VZ. |
| Downhole Sensor Excitation | Test Equipment Calibration Reference |
Use Scenario: Biasing bridge transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Low-noise 30 V source powering Wheatstone bridges in high-temperature probe housings. Use Value: 13 μV/√Hz noise density prevents signal-to-noise degradation in millivolt-level strain measurements. | Use Scenario: Fixed-voltage reference in portable multimeter internal calibration circuit. IC Role / Device Role / Timing Role: Primary Zener standard against which DMM ADC gain/offset are adjusted. Use Value: ±5% initial tolerance and <±0.01%/°C long-term drift ensure traceable metrology over 5-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4120UR-1 | Includes internal metallurgical bond; qualified to JAN/JANTXV levels | Required for military/aerospace programs demanding MIL-PRF-19500 screening | Select 1N4120UR-1 only when full military qualification and enhanced bond reliability are mandated |
| BZX55C30 | Plastic DO-35 package; 500 mW rating; ±5% tolerance; 200 Ω ZZT | Limited to ≤150 °C operation; not radiation-hardened; higher capacitance | Choose BZX55C30 for cost-sensitive commercial applications where extended temperature and radiation immunity are unnecessary |
Compared with 1N4120UR/TR, the 1N4120UR-1 adds military qualification and bond integrity at higher cost, while BZX55C30 offers lower-cost plastic packaging but sacrifices high-temperature capability, hermeticity, and radiation hardness.
Availability
1N4120UR/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace clamping circuits, downhole sensor excitation, and test equipment calibration requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for 1N4120UR/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N4120UR/TR belongs to Microsemi's legacy DO-213AA Zener series designed for mission-critical voltage regulation in aerospace, defense, oilfield, and industrial systems where hermeticity and extreme temperature resilience are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4120UR/TR?
The 1N4120UR/TR has a nominal Zener voltage of 30 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in Microsemi's official datasheet revision D. No suffix indicates this default tolerance; tighter tolerances (±2% or ±1%) require C or D suffixes, which are not present in the 1N4120UR/TR part number.
Does 1N4120UR/TR support lead-free soldering processes?
Yes, the 1N4120UR/TR is RoHS-compliant (denoted by the "e3" suffix) and features annealed matte-tin plating on end caps, qualified for lead-free reflow soldering at 260 °C for up to 10 seconds per MIL-STD-750 Method 2026, ensuring reliable intermetallic formation without tin whisker risk.
What is the maximum operating temperature for 1N4120UR/TR?
The 1N4120UR/TR is rated for continuous operation from −65 °C to +175 °C, validated per Microsemi's thermal characterization on FR4 boards with specified footprint. This rating applies to both junction and end-cap temperatures, enabling use in downhole, engine bay, and space-qualified systems.
Is 1N4120UR/TR compatible with traditional through-hole 1N4120 designs?
Yes, the 1N4120UR/TR is the surface-mount DO-213AA (MELF) equivalent of the axial-leaded JEDEC-registered 1N4120, sharing identical electrical specifications including 30 V Zener voltage, 250 mA test current, and ±5% tolerance, allowing functional replacement in upgraded layouts.
What is the Zener impedance of 1N4120UR/TR and why does it matter?
The 1N4120UR/TR has a maximum Zener impedance of 200 Ω at 250 mA test current. This value directly impacts regulation accuracy under varying load conditions: lower ZZT means smaller output voltage deviation when load current changes, critical for maintaining tight reference stability in precision analog circuits.
1N4120UR/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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 22.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4120UR/TR FAQ
1.How can I place an order for 1N4120UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4120UR/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 1N4120UR/TR reliable?
The price and inventory of 1N4120UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4120UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4120UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4120UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4120UR/TR?
1N4120UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4120UR/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 1N4120UR/TR?
For technical support, including 1N4120UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4120UR/TR requirements.
6.How does Aetrix verify that 1N4120UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4120UR/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 1N4120UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4120UR/TR?
All 1N4120UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4120UR/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 1N4120UR/TR part is unused and in its original packaging.
Return procedure for 1N4120UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4120UR/TR Tags
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