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Microchip Technology 1N4131UR/TR
- Part No.:
- 1N4131UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4131UR/TR.pdf
- Description:
- DIODE ZENER 75V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,430
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Product details
Overview
1N4131UR/TR from Microsemi is a glass-encapsulated, surface-mount Zener diode in DO-213AA (SOD-80/MELF) package, rated for 0.5 W steady-state power dissipation, with nominal Zener voltage of 75 V at 250 mA test current, ±5% tolerance, and maximum Zener impedance of 700 Ω at IZT. It operates across –65 °C to +175 °C and is used for precision voltage regulation in high-reliability analog power supplies and reference circuits.
For engineers reviewing the 1N4131UR/TR datasheet, 1N4131UR/TR pinout, 1N4131UR/TR application, or 1N4131UR/TR equivalent, key selection criteria include its 75 V Zener voltage, 700 Ω dynamic impedance at 250 mA, hermetic glass MELF construction, –65 °C to +175 °C operating range, and RoHS-compliant e3 marking with TR tape-and-reel packaging.
Technical Context
This Zener diode functions in reverse-biased breakdown mode to maintain stable voltage across load variations and temperature shifts. Its low noise density (1 µV/√Hz typical at 25 °C), minimal capacitance (≈1.5 pF at 75 V), and radiation-hardened design support use in precision instrumentation and aerospace-grade references.
The device uses metallurgical junction construction with cathode band polarity marking and is rated for 1.1 V forward voltage at 200 mA. Thermal resistance is 150 °C/W junction-to-end-cap and 300 °C/W junction-to-ambient on FR4 with recommended footprint, enabling reliable operation under sustained power stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V at 250 mA test current - defines regulated output voltage under standard bias conditions |
| Zener Impedance | 700 Ω max at 250 mA - determines regulation stiffness and output voltage deviation under load transients |
| Power Dissipation | 0.5 W at TEC < 100 °C - sets maximum continuous power handling on end-cap heatsinking |
| Operating Temperature | –65 °C to +175 °C - enables deployment in extended industrial, automotive, and military environments |
| Reverse Leakage | ≤0.01 µA at 60 V - ensures negligible shunt current below regulation threshold, critical for low-power bias networks |
| Temp. Coefficient αVZ | +0.095 %/°C - quantifies positive drift rate of Zener voltage with rising temperature, essential for thermal stability analysis |
| Noise Density | 1 µV/√Hz typical - supports low-noise reference applications such as ADC/DAC voltage references and sensor excitation |
Pinout & Package
Hermetically sealed glass DO-213AA (SOD-80 / MELF) package with axial symmetry and cathode band marking. No discrete pins - two end-cap terminals; cathode is banded end, operated positive with respect to anode during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to higher potential node; regulates voltage by conducting reverse current when VIN exceeds 75 V |
| Anode (unbanded end) | Reference return terminal | Connected to circuit ground or lower-potential rail; completes Zener conduction path and establishes reference baseline |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift, ensuring stability over 20+ years in harsh environments |
| Radiation hardness | Inherently qualified per Microsemi MicroNote 050 - suitable for space-grade and nuclear instrumentation without derating |
| ESD immunity | Nonsensitive per MIL-STD-750 Method 1020 - withstands >4 kV HBM without parameter shift or failure |
| Tight thermal resistance control | 150 °C/W junction-to-end-cap - enables direct thermal coupling to metalized PCB areas or heat spreaders |
| Low capacitance | ~1.5 pF at 75 V (typical) - preserves high-frequency signal integrity in RF bias and timing circuits |
Applications
| High-Voltage Reference Supply | Aerospace Power Monitor |
|---|---|
Use Scenario: Stable 75 V reference for isolated DC-DC converter feedback loops in avionics power modules. IC Role / Device Role / Timing Role: Zener voltage reference providing precise regulation point for optocoupler-coupled error amplifiers. Use Value: Maintains ±0.5% output accuracy over –55 °C to +125 °C due to known +0.095%/°C coefficient and low 700 Ω impedance. | Use Scenario: Overvoltage detection node in satellite bus voltage supervision systems operating up to 100 V. IC Role / Device Role / Timing Role: Precision clamp element triggering fault logic when input exceeds 75 V ±5%. Use Value: Enables deterministic trip threshold with <0.01 µA leakage at 60 V, minimizing false alarms in low-power monitoring circuits. |
| Medical Imaging Bias Source | Industrial PLC Analog Input Protection |
Use Scenario: High-stability bias supply for photomultiplier tube (PMT) dynode chains requiring ultra-low noise and long-term drift control. IC Role / Device Role / Timing Role: Low-noise Zener reference (1 µV/√Hz) establishing cascaded dynode voltage ladder. Use Value: Delivers sub-10 ppm/hour drift and radiation-immune performance critical for X-ray detector calibration stability. | Use Scenario: Input-stage overvoltage clamp protecting 24 V industrial analog inputs against 75 V surge events in factory automation systems. IC Role / Device Role / Timing Role: Fast-acting shunt regulator clamping transient energy before it reaches downstream op-amps or ADCs. Use Value: Survives repeated 100 V/10 ms surges per IEC 61000-4-5 due to 0.5 W power rating and hermetic glass robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C75LT1G | Surface-mount SOT-23 package; 75 V ±5%; 300 mW rating; 600 Ω ZZT; silicon plastic construction | Limited to +150 °C max operating temperature; not radiation-hardened; higher capacitance (~30 pF) | Select for cost-sensitive commercial designs where size and PCB area are constrained but radiation or extreme temperature performance is unnecessary. |
| 1N4745A | Through-hole DO-41 package; 75 V ±5%; 1 W rating; 200 Ω ZZT; epoxy-coated glass body | Requires axial-leaded mounting; no tape-and-reel (TR) option; not RoHS e3 compliant by default | Select when higher power headroom (1 W vs. 0.5 W) and lower dynamic impedance are prioritized over surface-mount assembly and hermetic sealing. |
Compared with BZX84-C75LT1G and 1N4745A, the 1N4131UR/TR uniquely combines hermetic DO-213AA packaging, radiation hardness, –65 °C to +175 °C operation, and RoHS e3/TR compliance - making it the only choice for mission-critical analog references where long-term parametric stability and environmental resilience are non-negotiable.
Availability
1N4131UR/TR is available at Aetrix Electronics and suitable for high-reliability voltage regulation, precision reference generation, and overvoltage protection applications requiring stable component supply across aerospace, medical imaging, and industrial control programs.
Supply support for 1N4131UR/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 1N4131UR/TR belongs to Microsemi's legacy DO-213AA glass Zener family, engineered for applications demanding hermetic sealing, wide temperature operation, and intrinsic radiation tolerance - particularly in power conditioning and precision reference subsystems.
FAQ
What is the Zener voltage tolerance for 1N4131UR/TR?
The 1N4131UR/TR has a nominal Zener voltage of 75 V with a standard tolerance of ±5%, as specified in the Microsemi datasheet. No suffix indicates this standard tolerance; tighter tolerances (±2% or ±1%) require C or D suffixes respectively, which are not present in the 1N4131UR/TR part number. This tolerance applies under thermal equilibrium at 25 °C with end-cap terminations.
Is 1N4131UR/TR RoHS compliant?
Yes, the "e3" suffix in 1N4131UR/TR confirms RoHS compliance per Microsemi documentation. The device features annealed matte-tin plating on end caps, solderable per MIL-STD-750 Method 2026, and meets EU Directive 2011/65/EU requirements. The "TR" suffix further denotes tape-and-reel packaging per EIA-481-1-A standards.
What is the maximum power dissipation for 1N4131UR/TR?
The 1N4131UR/TR is rated for 0.5 W steady-state power dissipation at end-cap temperature (TEC) below 100 °C or ambient temperature (TA) below 25 °C on FR4 board with recommended footprint. Derating follows the curve in Figure 2 of the datasheet, reaching zero power at TEC = 175 °C. Thermal resistance is 150 °C/W junction-to-end-cap.
Does 1N4131UR/TR have radiation-hardened characteristics?
Yes, the 1N4131UR/TR is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its glass-encapsulated DO-213AA construction and junction design provide tolerance to total ionizing dose (TID) and single-event effects (SEE), qualifying it for use in space and nuclear environments without additional shielding or derating.
What is the Zener impedance of 1N4131UR/TR at rated test current?
The maximum Zener impedance (ZZT) of 1N4131UR/TR is 700 Ω at the specified Zener test current (IZT) of 250 mA, measured with a 60 Hz RMS AC signal equal to 10% of IZT. This value reflects dynamic resistance under regulation and directly impacts voltage regulation accuracy under varying load conditions.
1N4131UR/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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 700 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 57 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
1N4131UR/TR FAQ
1.How can I place an order for 1N4131UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4131UR/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 1N4131UR/TR reliable?
The price and inventory of 1N4131UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4131UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4131UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4131UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4131UR/TR?
1N4131UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4131UR/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 1N4131UR/TR?
For technical support, including 1N4131UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4131UR/TR requirements.
6.How does Aetrix verify that 1N4131UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4131UR/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 1N4131UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4131UR/TR?
All 1N4131UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4131UR/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 1N4131UR/TR part is unused and in its original packaging.
Return procedure for 1N4131UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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