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Microchip Technology 1N4128UR-1/TR
- Part No.:
- 1N4128UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4128UR-1/TR.pdf
- Description:
- DIODE ZENER 60V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,278
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Product details
Overview
1N4128UR-1/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 60 V at 250 mA test current, ±5% tolerance, and maximum Zener impedance of 400 Ω at IZT. It operates across –65 °C to +175 °C and regulates voltage in precision reference and overvoltage protection circuits.
For engineers reviewing the 1N4128UR-1/TR datasheet, 1N4128UR-1/TR pinout, 1N4128UR-1/TR application, or 1N4128UR-1/TR equivalent, key selection criteria include its 60 V Zener voltage, 400 Ω dynamic impedance, hermetically sealed MELF package, low noise density (1 μV/√Hz), and compatibility with high-reliability industrial and aerospace systems requiring stable voltage clamping under wide temperature and current variation.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode, with regulation established by controlled avalanche mechanism above 6.8 V. Its thermal resistance is 150 °C/W junction-to-end-cap and 300 °C/W junction-to-ambient on FR4 board, enabling stable operation up to 175 °C storage temperature.
The 1N4128UR-1/TR features an internal metallurgical bond (denoted by "-1" suffix), enhancing mechanical robustness and thermal cycling reliability versus standard wire-bonded variants. Its cathode band marking and polarity-sensitive mounting require the banded end to be held positive relative to the anode during Zener regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 60 V at 250 mA test current - defines precise clamping threshold for overvoltage protection and reference circuits |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous thermal load without derating on properly designed PCB footprint |
| Zener Impedance ZZT | 400 Ω max at 250 mA - determines regulation stiffness and output voltage deviation under load current changes |
| Reverse Leakage IR | 0.01 μA max at 45.6 V - ensures minimal standby current in high-impedance bias networks |
| Temp. Coefficient αVZ | +0.090 %/°C - quantifies positive drift of Zener voltage with rising temperature, critical for temperature-stable references |
| Noise Density | 1 μV/√Hz typical at 25 °C - supports low-noise analog sensing and precision instrumentation applications |
| Package | DO-213AA (SOD-80/MELF) - hermetically sealed glass surface-mount package with 1.6–1.7 mm diameter and 3.3–3.7 mm length |
Pinout & Package
DO-213AA (SOD-80/MELF) is a cylindrical, hermetically sealed glass surface-mount package with axial symmetry and cathode identification via a single dark band. No discrete pins exist; terminals are the two metallized end caps - cathode (banded end) and anode (unmarked end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output terminal | Must be held positive relative to anode to maintain Zener conduction; connects to protected node or reference point |
| Anode (unmarked end) | Reference/return terminal | Typically grounded or connected to lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Internal metallurgical bond construction | Eliminates wire bond fatigue failure modes, improving reliability in high-vibration and thermal-cycling environments |
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift, supporting 175 °C storage and extended field life |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling and assembly without special ESD controls, reducing manufacturing overhead |
| Low capacitance (typ. 2.5 pF at 0 V) | Maintains high-frequency response in RF detector and fast transient suppression circuits |
| Radiation-hardened per MicroNote 050 | Validated performance in total ionizing dose (TID) environments up to 100 krad(Si), suitable for space-grade designs |
Applications
| Industrial Power Supply Monitoring | Aerospace Voltage Reference |
|---|---|
|
Use Scenario: Monitoring 48 V DC bus in programmable logic controller (PLC) backplane to trigger shutdown if voltage exceeds 62 V. IC Role / Device Role / Timing Role: Zener clamp acting as overvoltage sense element feeding comparator input. Use Value: 60 V nominal Zener voltage with +0.090 %/°C coefficient enables predictable trip point shift over –40 °C to +85 °C operating range. |
Use Scenario: Providing stable 60 V reference for radiation-tolerant ADC biasing in satellite telemetry subsystem. IC Role / Device Role / Timing Role: Precision voltage reference source in analog front-end signal conditioning chain. Use Value: Hermetic DO-213AA package and radiation hardness per MicroNote 050 ensure parametric stability after 100 krad(Si) exposure. |
| Medical Imaging HV Bias Clamp | Test Equipment Calibration Standard |
|
Use Scenario: Clamping transient spikes on 60 V X-ray detector bias rail during pulsed operation. IC Role / Device Role / Timing Role: Fast-response overvoltage protector limiting peak excursion to ≤65 V. Use Value: 400 Ω Zener impedance and 0.5 W rating sustain repeated 100 ms transients without degradation. |
Use Scenario: Serving as traceable 60 V calibration node in benchtop multimeter self-test circuitry. IC Role / Device Role / Timing Role: Primary voltage standard referenced against NIST-traceable sources. Use Value: ±5% initial tolerance and <0.01 μA leakage at 45.6 V support repeatable, low-drift calibration checks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4128UR-1 | No TR tape-and-reel packaging; bulk or ammo pack only; identical electrical specs and metallurgical bond | Lacks automated SMT placement support; suited for hand-solder or low-volume prototyping | Select when reel packaging is unnecessary and cost-per-unit optimization is prioritized |
| BZX84-C62LT1G | 62 V nominal Zener, ±5% tolerance, SOT-23 package, 350 mW rating, higher ZZT (600 Ω) | Lower power rating and plastic package limit use in high-temp or radiation environments | Choose for cost-sensitive commercial applications where 62 V clamping and SMT compatibility outweigh hermeticity needs |
Compared with 1N4128UR-1/TR, the 1N4128UR-1 offers identical performance but lacks tape-and-reel convenience, while BZX84-C62LT1G trades hermetic reliability and 0.5 W capability for smaller size and lower cost in non-critical environments.
Availability
1N4128UR-1/TR is available at Aetrix Electronics and suitable for industrial power supply monitoring, aerospace voltage reference, medical imaging HV bias clamp, and test equipment calibration standard applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for 1N4128UR-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 1N4128UR-1/TR belongs to Microsemi's legacy DO-213AA Zener series, engineered for mission-critical voltage regulation where hermetic sealing, wide temperature operation, and proven radiation tolerance are mandatory design requirements.
FAQ
What is the Zener voltage tolerance for 1N4128UR-1/TR?
The 1N4128UR-1/TR has a nominal Zener voltage of 60 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification. No suffix indicates this default tolerance; tighter tolerances (±2% or ±1%) would require C or D suffixes not present in this part number. The 1N4128UR-1/TR maintains this tolerance across its full operating temperature range of –65 °C to +175 °C.
Does 1N4128UR-1/TR have a RoHS-compliant version?
Yes - the "e3" suffix denotes RoHS compliance, and the 1N4128UR-1/TR is explicitly listed in the e3 family documentation. Its end caps feature annealed matte-tin plating compliant with MIL-STD-750 Method 2026, and all materials meet EU RoHS Directive 2011/65/EU requirements. The "TR" suffix confirms tape-and-reel packaging, fully compatible with RoHS-compliant SMT assembly.
What does the "-1" in 1N4128UR-1/TR signify?
The "-1" suffix in 1N4128UR-1/TR indicates internal metallurgical bond construction, a reliability enhancement replacing traditional wire bonding with direct metal-to-semiconductor interconnect. This improves thermal cycling endurance and vibration resistance. The "TR" suffix is separate and denotes tape-and-reel packaging - so 1N4128UR-1/TR combines both metallurgical bonding and automated placement readiness.
Can 1N4128UR-1/TR replace axial-leaded 1N4128 in existing designs?
No - the 1N4128UR-1/TR uses a DO-213AA (MELF) surface-mount package, whereas the legacy 1N4128 is axial-leaded DO-35. They share identical electrical specifications but differ mechanically: DO-213AA requires reflow-compatible footprint (0.080″ pad spacing, 0.200″ pad length), while DO-35 uses through-hole holes. Direct replacement requires PCB redesign and solder process validation.
What is the maximum reverse leakage current for 1N4128UR-1/TR?
The maximum reverse leakage current (IR) for 1N4128UR-1/TR is 0.01 μA at 45.6 V (76% of nominal 60 V Zener voltage), measured at 25 °C. This ultra-low leakage supports high-impedance bias networks and precision reference dividers where loading error must remain below 1 nA. The value remains stable across the full –65 °C to +125 °C operating range per characterization data.
1N4128UR-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):
- 60 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 400 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 45.6 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
1N4128UR-1/TR FAQ
1.How can I place an order for 1N4128UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4128UR-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 1N4128UR-1/TR reliable?
The price and inventory of 1N4128UR-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 1N4128UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4128UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4128UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4128UR-1/TR?
1N4128UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4128UR-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 1N4128UR-1/TR?
For technical support, including 1N4128UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4128UR-1/TR requirements.
6.How does Aetrix verify that 1N4128UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4128UR-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 1N4128UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4128UR-1/TR?
All 1N4128UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4128UR-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 1N4128UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4128UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4128UR-1/TR Tags
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MMBZ5240B-7-F
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