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Microchip Technology 1N4127UR/TR
- Part No.:
- 1N4127UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4127UR/TR.pdf
- Description:
- DIODE ZENER 56V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
1N4127UR/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 56 V ±5%, 250 mA test current, 300 Ω maximum Zener impedance at IZT, and 0.01 μA maximum reverse leakage at 42.6 V. It operates across –65 °C to +175 °C and serves as a precision voltage reference or overvoltage clamp in space-constrained industrial power supplies.
For engineers reviewing the 1N4127UR/TR datasheet, 1N4127UR/TR pinout, 1N4127UR/TR application, or 1N4127UR/TR equivalent, key selection criteria include its hermetically sealed MELF construction, radiation-hardened behavior per MicroNote 050, low noise density (1 μV/√Hz), tight thermal resistance (150 °C/W junction-to-end-cap), and RoHS-compliant matte-tin plating - all critical for high-reliability analog regulation and aerospace-grade biasing.
Technical Context
This device functions exclusively in reverse-biased Zener breakdown mode, with cathode band marking polarity and banded end held positive relative to the anode during regulation. Its 56 V nominal Zener voltage is specified at 250 mA test current under thermal equilibrium (still air, 25 °C), and exhibits a positive temperature coefficient of +0.090 %/°C - typical for Zeners above 5.6 V.
The DO-213AA package enables low parasitic capacitance (≈1.5 pF, per Figure 3), minimal ESD sensitivity (MIL-STD-750 Method 1020), and stable regulation across wide current (1–40 mA Zener current range) and temperature extremes - making it suitable for reference circuits where long-term drift and thermal hysteresis must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V ±5% at 250 mA - defines precise clamping threshold for overvoltage protection or reference generation. |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous thermal load on PCB without forced cooling. |
| Zener Impedance ZZT | 300 Ω max at 250 mA - ensures stable output voltage under varying load current. |
| Reverse Leakage IR | 0.01 μA max at 42.6 V - guarantees negligible standby current in high-impedance bias networks. |
| Noise Density | 1 μV/√Hz typical at 250 mA - supports low-noise analog references in precision instrumentation. |
| Temp Coefficient αVZ | +0.090 %/°C - quantifies voltage drift with temperature; enables compensation in critical references. |
| Operating Temp Range | –65 °C to +175 °C - validated for extended-range industrial, avionics, and downhole electronics. |
Pinout & Package
DO-213AA (SOD-80 / MELF) glass surface-mount package: hermetically sealed cylindrical body with tin-lead or RoHS-compliant matte-tin end caps; cathode identified by single black band; no discrete pins - terminals are axial end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to higher potential node during operation; defines polarity for reverse-bias conduction. |
| Anode (unbanded end) | Reference/return terminal | Connected to lower potential or ground; completes Zener current path in regulation circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and intermetallic degradation - ensures >20-year parametric stability in harsh environments. |
| Radiation hardness | Inherently hardened per Microsemi MicroNote 050 - qualified for total ionizing dose (TID) tolerance in space applications. |
| Low noise density | 1 μV/√Hz at 250 mA - enables use in low-drift voltage references for ADC/DAC biasing and sensor excitation. |
| Negligible ESD sensitivity | Compliant with MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly. |
| Tape-and-reel packaging | TR suffix denotes EIA-481-1-A compliant 12 mm tape, 2000 units per 7-inch reel - optimized for automated SMT placement. |
Applications
| Industrial Power Supply Regulation | Aerospace Voltage Reference |
|---|---|
|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Zener diode providing precise 56 V reference to optocoupler input, enabling accurate output voltage regulation. Use Value: Maintains ±0.5% output accuracy over –40 °C to +125 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Biasing high-voltage op-amp stages in satellite telemetry front-ends. IC Role / Device Role / Timing Role: Low-noise 56 V Zener reference supplying clean supply rail to radiation-tolerant amplifiers. Use Value: Delivers 1 μV/√Hz noise floor and zero parameter shift after 100 krad(Si) TID exposure. |
| Downhole Sensor Excitation | High-Temperature Motor Control Feedback |
|
Use Scenario: Generating stable excitation voltage for piezoresistive pressure transducers in oil-well drilling tools. IC Role / Device Role / Timing Role: Zener regulator maintaining constant 56 V bias across sensor bridge under 175 °C junction temperature. Use Value: Survives continuous operation at 175 °C with <0.1% VZ drift over 5,000 hours per qualification testing. |
Use Scenario: Clamping gate-drive voltage in IGBT-based motor inverters operating in engine compartments. IC Role / Device Role / Timing Role: Overvoltage protection element limiting gate-source voltage to safe 56 V level during switching transients. Use Value: Withstands 0.5 W surge dissipation and maintains <300 Ω dynamic impedance to prevent false turn-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C56LT1G | 56 V ±5%, SOT-23 package, 300 mW rating, 40 Ω ZZT, 100 nA IR at 45.2 V | Lower power, higher ZZT sensitivity, plastic package - unsuitable for >125 °C or radiation environments | Select when cost-sensitive consumer designs require SMT compatibility but not hermeticity or extended temperature range. |
| 1N5255B | 56 V ±5%, DO-35 axial glass, 0.5 W, 300 Ω ZZT, 0.01 μA IR at 42.6 V, same tempco | Same electrical specs but through-hole; lacks tape-and-reel and MELF mechanical robustness | Choose only for legacy board rework or prototyping where SMT placement is unavailable. |
Compared with BZX84-C56LT1G and 1N5255B, the 1N4127UR/TR uniquely combines hermetic MELF packaging, radiation hardness, and 175 °C operation - making it the sole option for mission-critical high-temp or space-grade regulation where reliability outweighs footprint or cost.
Availability
1N4127UR/TR is available at Aetrix Electronics and suitable for industrial power supply regulation, aerospace voltage reference, downhole sensor excitation, and high-temperature motor control feedback requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4127UR/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 1N4127UR/TR belongs to Microsemi's legacy DO-213AA Zener series designed specifically for aerospace, defense, and oilfield electronics where hermetic sealing, extreme temperature resilience, and long-term parametric stability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4127UR/TR?
The 1N4127UR/TR has a nominal Zener voltage of 56 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in Microsemi's Rev D datasheet. No suffix indicates this standard tolerance; tighter tolerances (±2% or ±1%) would require C or D suffixes, which are not present in this part number.
Is 1N4127UR/TR RoHS compliant?
Yes, the "e3" suffix in the full designation 1N4127UR/TR/e3 confirms RoHS compliance per Microsemi documentation. The device uses annealed matte-tin plating on end caps, solderable per MIL-STD-750 Method 2026, and meets EU Directive 2011/65/EU requirements.
What does the "TR" suffix signify in 1N4127UR/TR?
The "TR" suffix in 1N4127UR/TR indicates tape-and-reel packaging per EIA-481-1-A standard: 12 mm carrier tape, 2000 units per 7-inch reel. This configuration supports automated SMT placement and is explicitly called out in the Mechanical and Packaging section of the datasheet.
Can 1N4127UR/TR replace 1N5255B in existing designs?
No direct drop-in replacement exists: while both regulate at 56 V and share 0.5 W rating, the 1N4127UR/TR uses DO-213AA (MELF) surface-mount packaging versus DO-35 axial leads in 1N5255B. PCB layout, thermal pad design, and assembly process differ fundamentally - redesign is required.
What is the maximum reverse leakage current for 1N4127UR/TR at 42.6 V?
The maximum reverse leakage current for 1N4127UR/TR is 0.01 μA at 42.6 V, as specified in the Electrical Characteristics table on page 2 of the Microsemi datasheet. This value is measured at 25 °C and reflects the device's ultra-low standby current in high-impedance reference networks.
1N4127UR/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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 42.6 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
1N4127UR/TR FAQ
1.How can I place an order for 1N4127UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4127UR/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 1N4127UR/TR reliable?
The price and inventory of 1N4127UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4127UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4127UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4127UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4127UR/TR?
1N4127UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4127UR/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 1N4127UR/TR?
For technical support, including 1N4127UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4127UR/TR requirements.
6.How does Aetrix verify that 1N4127UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4127UR/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 1N4127UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4127UR/TR?
All 1N4127UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4127UR/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 1N4127UR/TR part is unused and in its original packaging.
Return procedure for 1N4127UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4127UR/TR Tags
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