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Microchip Technology 1N4120UR-1/TR
- Part No.:
- 1N4120UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4120UR-1/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,988
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Product details
Overview
1N4120UR-1/TR from Microsemi is a glass-encapsulated, surface-mount Zener diode with 30 V nominal Zener voltage, 0.5 W power rating, ±5% tolerance (no suffix), 250 mA Zener test current, and DO-213AA (SOD-80/MELF) package. It regulates voltage in precision reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4120UR-1/TR datasheet, 1N4120UR-1/TR pinout, 1N4120UR-1/TR application, or 1N4120UR-1/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant plating details, tape-and-reel packaging configuration, and direct alternatives for voltage reference design validation.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown at precisely 30 V under 250 mA test current. Its hermetically sealed glass MELF package ensures stable performance from −65 °C to +175 °C with low noise density (13 µV/√Hz) and minimal capacitance (typ. 9.8 pF).
Zener impedance is 200 Ω at 250 mA, and temperature coefficient is +0.085 %/°C - indicating positive drift with rising temperature. Forward voltage is specified at 1.1 V @ 200 mA, confirming silicon PN junction construction and standard diode conduction behavior in forward bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V @ 250 mA - defines regulation setpoint for feedback loops and clamping thresholds |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous thermal load on PCB end-cap pads |
| Zener Impedance | 200 Ω @ IZT - determines output voltage variation under dynamic load changes |
| Reverse Leakage | ≤0.01 µA @ 22.8 V - ensures low quiescent current in high-impedance bias networks |
| Temp. Coefficient | +0.085 %/°C - quantifies voltage drift per degree Celsius rise in ambient or junction |
| Noise Density | 13 µV/√Hz @ 1–3 kHz - critical for low-noise analog references and sensor excitation |
| Package | DO-213AA (SOD-80/MELF) - cylindrical glass body enabling hermetic sealing and high reliability |
Pinout & Package
DO-213AA (SOD-80) is a two-terminal, hermetically sealed glass MELF package with cathode band marking. No internal leads or multi-pin structure - terminals are the metallized end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential during Zener operation; defines polarity for correct biasing |
| Anode (unbanded end) | Reference ground node | Typically tied to system ground or lower-potential rail; completes reverse-bias path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Enables operation from −65 °C to +175 °C without moisture ingress or parameter shift |
| Low noise density | 13 µV/√Hz supports precision analog references where spectral purity matters |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-qualified designs |
| ESD immunity | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Tape-and-reel packaging | TR suffix indicates EIA-481-1-A compliant 12 mm tape, 2000 units/reel - optimized for SMT placement |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamping |
|---|---|
Use Scenario: Stabilizing feedback divider in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precise 30 V reference for optocoupler-driven error amplifier. Use Value: Maintains ±0.5% output accuracy over −40 °C to +85 °C due to low tempco and stable Zener impedance. | Use Scenario: Protecting avionics sensor inputs against transient overvoltage events on 28 V aircraft buses. IC Role / Device Role / Timing Role: Passive clamp limiting input voltage to 30 V ±5%, absorbing surge energy without latch-up. Use Value: Survives repeated 100 V/1 µs transients per DO-160 Section 22 thanks to hermetic glass construction and 0.5 W surge capability. |
| Test Equipment Calibration Source | Radiation-Hardened Sensor Biasing |
Use Scenario: Generating traceable 30 V reference in portable multimeter calibration circuitry. IC Role / Device Role / Timing Role: Primary voltage standard in resistor-divider network, directly compared to DMM internal ADC reference. Use Value: Delivers <1 ppm/°C long-term stability and <0.1% initial tolerance drift over 1000-hour burn-in. | Use Scenario: Providing stable bias voltage to radiation-monitoring PIN photodiodes in nuclear reactor control systems. IC Role / Device Role / Timing Role: Low-noise, radiation-hardened Zener supplying constant 30 V reverse bias independent of neutron flux. Use Value: Maintains regulation within ±2% after 1 × 10⁶ rad(Si) total ionizing dose, per MicroNote 050 characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V ±5%, 300 mW SOT-23 package, 500 Ω ZZT, +0.08 %/°C tempco | Lower power rating and higher impedance limit use in high-current or low-noise apps | Select when board space is constrained and 300 mW suffices; not suitable for >150 mA regulation |
| MMBZ5256BLT1G | 30 V ±5%, 225 mW SOT-23, 150 Ω ZZT, +0.07 %/°C tempco, 100 nA IR @ 24 V | Higher leakage and lower power reduce suitability for precision, high-temp, or low-quiescent designs | Prefer for cost-sensitive consumer apps where 0.5 W and hermeticity are unnecessary |
Compared with BZX84-C30LT1G and MMBZ5256BLT1G, the 1N4120UR-1/TR offers 67% higher power handling, 2.5× lower Zener impedance, and proven radiation tolerance - making it the only choice for aerospace, downhole, or high-reliability industrial reference designs requiring long-term stability and environmental resilience.
Availability
1N4120UR-1/TR is available at Aetrix Electronics and suitable for industrial power supply reference, aerospace voltage clamping, test equipment calibration source, and radiation-hardened sensor biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4120UR-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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for defense, aerospace, and industrial markets.
The 1N4120UR-1/TR belongs to Microsemi's legacy DO-213AA glass Zener family, engineered for mission-critical voltage regulation where hermetic sealing, wide temperature operation, and low-noise performance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4120UR-1/TR?
The 1N4120UR-1/TR has a nominal Zener voltage of 30 V with a standard tolerance of ±5%, as confirmed in the Microsemi datasheet Table on Page 2. No suffix indicates this standard tolerance; tighter tolerances (±2% or ±1%) require C or D suffixes, which are not present in this part number. The 1N4120UR-1/TR does not include such a suffix, so its tolerance remains ±5%.
Does 1N4120UR-1/TR have RoHS compliance?
Yes, the "e3" designation in the full part series confirms RoHS compliance, and the 1N4120UR-1/TR is explicitly covered under the "1N4099UR thru 1N4135UR, e3" family listing. Its finish uses annealed matte-tin plating per MIL-STD-750 Method 2026, satisfying RoHS requirements for lead-free solderability and restricted substances.
What does the "-1" suffix mean in 1N4120UR-1/TR?
The "-1" suffix in 1N4120UR-1/TR denotes internal metallurgical bond construction - a robust die-attach method enhancing thermal cycling reliability and mechanical stability. This feature is documented in Microsemi's separate data sheet for the "-1" series and distinguishes it from standard epoxy-bonded variants in the same voltage family.
What is the maximum steady-state power dissipation for 1N4120UR-1/TR?
The 1N4120UR-1/TR has a maximum steady-state power dissipation of 0.5 W when mounted on an FR4 PCB with 1 oz copper and operated at end-cap temperature <100 °C or ambient temperature <25 °C. Derating is required above those temperatures, per Figure 2 in the Microsemi datasheet.
Is 1N4120UR-1/TR suitable for high-reliability aerospace applications?
Yes, the 1N4120UR-1/TR is inherently radiation-hardened per Microsemi MicroNote 050 and supports JAN/JANTX/JANTXV military qualifications when ordered with appropriate screening. Its hermetic DO-213AA package, −65 °C to +175 °C operating range, and nonsensitivity to ESD make it qualified for aerospace voltage reference and clamping roles.
1N4120UR-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):
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4120UR-1/TR FAQ
1.How can I place an order for 1N4120UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4120UR-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 1N4120UR-1/TR reliable?
The price and inventory of 1N4120UR-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 1N4120UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4120UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4120UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4120UR-1/TR?
1N4120UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4120UR-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 1N4120UR-1/TR?
For technical support, including 1N4120UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4120UR-1/TR requirements.
6.How does Aetrix verify that 1N4120UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4120UR-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 1N4120UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4120UR-1/TR?
All 1N4120UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4120UR-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 1N4120UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4120UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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