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Microchip Technology 1N4125UR/TR
- Part No.:
- 1N4125UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4125UR/TR.pdf
- Description:
- DIODE ZENER 47V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,167
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Product details
Overview
1N4125UR/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 47 V ±5%, 250 mA test current, 250 Ω maximum Zener impedance at IZT, and −0.090 %/°C temperature coefficient. It regulates voltage in precision reference and overvoltage protection circuits across industrial power supplies.
For engineers reviewing the 1N4125UR/TR datasheet, 1N4125UR/TR pinout, 1N4125UR/TR application, or 1N4125UR/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, hermetic packaging details, RoHS-compliant plating, and JEDEC-registered 1N-series compatibility - all critical for high-reliability analog design and long-lifecycle BOM planning.
Technical Context
This Zener operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode for regulation. Its 47 V nominal voltage is specified at 250 mA test current under thermal equilibrium at 25 °C, with Zener impedance measured using 25 µA RMS AC superimposed on IZT.
The device exhibits low noise density (1 µV/√Hz typical), minimal capacitance (<1 pF at 47 V), and inherent radiation hardness per MicroNote 050. It maintains stable regulation from −65 °C to +175 °C, with thermal resistance of 150 °C/W junction-to-end-cap and 300 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 47 V ±5% at 250 mA - defines primary regulation setpoint for feedback loops and clamp thresholds |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous thermal load without forced cooling or heatsinking |
| Zener Impedance | 250 Ω max at IZT - determines output voltage variation under dynamic load changes |
| Temperature Coefficient | −0.090 %/°C - quantifies voltage drift per degree Celsius for stability-critical references |
| Noise Density | 1 µV/√Hz typical - enables low-noise analog sensing and precision ADC reference applications |
| Reverse Leakage | 10 nA max at 37.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Forward Voltage | 1.1 V at 200 mA - supports bidirectional ESD protection when used in series with other devices |
Pinout & Package
Hermetically sealed glass DO-213AA (SOD-80/MELF) package: cylindrical body with tin-lead or matte-tin plated end caps; cathode identified by single black band; polarity requires banded end positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Reference ground node in shunt regulator configuration; connects to system GND or low-side return path |
| Cathode | Banded end | Regulated output node; connects to voltage rail being stabilized or clamped |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Encapsulation | Enables operation from −65 °C to +175 °C with zero moisture ingress risk in aerospace and downhole environments |
| JEDEC-Registered 1N-Series Compatibility | Direct drop-in replacement for legacy 1N4125 axial-leaded parts in automated SMT assembly lines |
| RoHS-Compliant "e3" Variant | Meets EU Directive 2011/65/EU with annealed matte-tin plating, solderable per MIL-STD-750 Method 2026 |
| ESD Insensitivity | Passes MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board-level handling |
| Tape-and-Reel Packaging | Standard EIA-481-1-A format (12 mm tape, 2000/reel) - supports high-speed pick-and-place placement |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp in Telecom Line Cards |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters operating from −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 47 V threshold for error amplifier input. Use Value: Maintains ±0.5% output regulation over full temperature range due to −0.090 %/°C TC and low ZZT. | Use Scenario: Protecting line interface ICs against lightning-induced surges on 48 V DC distribution buses. IC Role / Device Role / Timing Role: Fast-acting crowbar element clamping transient spikes above 47 V. Use Value: Responds within nanoseconds with <1 pF junction capacitance, minimizing signal distortion on high-speed data lines. |
| Aerospace Sensor Bias Network | Medical Imaging HV Monitor Circuit |
Use Scenario: Generating stable bias for radiation-hardened op-amps in satellite attitude control systems. IC Role / Device Role / Timing Role: Precision voltage reference in low-current bias chain for analog front-end amplifiers. Use Value: Delivers 1 µV/√Hz noise floor and radiation hardness per MicroNote 050 for mission-critical signal integrity. | Use Scenario: Monitoring 45–50 V supply rails in X-ray generator control modules with strict safety compliance. IC Role / Device Role / Timing Role: Fail-safe overvoltage detector triggering shutdown before capacitor over-stress. Use Value: Guarantees 10 nA leakage at 37.6 V, preventing false trips in high-impedance monitoring paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 47 V ±5%, 1 W rating, DO-41 package, 100 Ω ZZT, +0.075 %/°C TC | Higher power but larger footprint and positive TC - less suitable for tight thermal zones or low-drift references | Select 1N4125UR/TR when space-constrained SMT layout, negative TC matching, or hermetic reliability is required |
| BZX84-C47 | 47 V ±5%, 300 mW, SOT-23 package, 150 Ω ZZT, −0.075 %/°C TC, 100 nA IR @ 37.6 V | Plastic package, lower surge capability, higher leakage - limited to commercial-grade consumer electronics | Select 1N4125UR/TR for extended temperature operation, hermetic sealing, or MIL-STD-750 qualified ESD immunity |
Compared with 1N4750A and BZX84-C47, the 1N4125UR/TR offers superior thermal stability (−0.090 %/°C), hermetic DO-213AA packaging for harsh environments, and JEDEC-registered compatibility - making it optimal for industrial, aerospace, and telecom infrastructure where long-term parametric drift and reliability are non-negotiable.
Availability
1N4125UR/TR is available at Aetrix Electronics and suitable for industrial power supplies, telecom line card protection, aerospace sensor biasing, and medical imaging monitor circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4125UR/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 analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N4125UR/TR belongs to Microsemi's legacy 1N-series Zener family designed for precision voltage regulation in mission-critical systems where hermeticity, wide temperature operation, and JEDEC interoperability are essential.
FAQ
What is the Zener voltage tolerance and test condition for the 1N4125UR/TR?
The 1N4125UR/TR has a nominal Zener voltage of 47 V with ±5% tolerance, measured at 250 mA test current (IZT) under thermal equilibrium at 25 °C ambient. This tolerance applies to the base part number without C or D suffixes; tighter 2% or 1% tolerances require suffix C or D respectively.
Does the 1N4125UR/TR have RoHS-compliant packaging options?
Yes, the 1N4125UR/TR is RoHS compliant and designated with the "e3" suffix per the datasheet. It features annealed matte-tin plating on end caps, solderable per MIL-STD-750 Method 2026, and meets EU Directive 2011/65/EU requirements without lead or hazardous substances.
What is the maximum power dissipation and thermal derating behavior of the 1N4125UR/TR?
The 1N4125UR/TR is rated for 0.5 W steady-state power dissipation at end-cap temperature below 100 °C or ambient temperature below 25 °C on FR4 board. Derating begins linearly beyond those points, with thermal resistance of 150 °C/W junction-to-end-cap and 300 °C/W junction-to-ambient per recommended footprint.
How is polarity marked and interpreted on the 1N4125UR/TR?
The 1N4125UR/TR uses a single black cathode band to indicate polarity. For Zener regulation, the banded (cathode) end must be held positive relative to the non-banded (anode) end. Reversing polarity places the device in forward conduction mode with 1.1 V drop at 200 mA.
Is the 1N4125UR/TR suitable for high-reliability or military applications?
Yes - the 1N4125UR/TR is JEDEC-registered, hermetically sealed in glass DO-213AA, nonsensitive to ESD per MIL-STD-750 Method 1020, and inherently radiation-hard per MicroNote 050. Internal metallurgical bond variants (e.g., 1N4125UR-1) support JAN/JANTX/JANTXV qualification upon request.
1N4125UR/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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 35.75 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
1N4125UR/TR FAQ
1.How can I place an order for 1N4125UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4125UR/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 1N4125UR/TR reliable?
The price and inventory of 1N4125UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4125UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4125UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4125UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4125UR/TR?
1N4125UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4125UR/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 1N4125UR/TR?
For technical support, including 1N4125UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4125UR/TR requirements.
6.How does Aetrix verify that 1N4125UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4125UR/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 1N4125UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4125UR/TR?
All 1N4125UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4125UR/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 1N4125UR/TR part is unused and in its original packaging.
Return procedure for 1N4125UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4125UR/TR Tags
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