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Microchip Technology 1N4128UR/TR
- Part No.:
- 1N4128UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4128UR/TR.pdf
- Description:
- DIODE ZENER 60V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,840
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Product details
Overview
1N4128UR/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 ±5%, 250 mA test current, 400 Ω maximum Zener impedance at IZT, and operating temperature range from –65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in high-reliability power supply feedback loops.
For engineers reviewing the 1N4128UR/TR datasheet, 1N4128UR/TR pinout, 1N4128UR/TR application, or 1N4128UR/TR equivalent, this part is selected for stable 60 V regulation under wide thermal and current variation, low noise density (1 µV/√Hz), hermetic glass sealing, and RoHS-compliant (e3) tin-plated end caps - critical for aerospace, industrial control, and medical power systems.
Technical Context
This device operates in reverse-biased Zener breakdown mode with cathode band marking polarity. Its regulation behavior is defined at 250 mA test current (IZT) and validated across –65 °C to +175 °C ambient and end-cap temperature ranges. Thermal resistance is 150 °C/W junction-to-end-cap when mounted per recommended footprint on FR4 with 1 oz Cu.
It exhibits a positive temperature coefficient of +0.090 %/°C for Zener voltage above 50 V, minimal capacitance (~6.4 pF typical), and inherent radiation hardness per Microsemi MicroNote 050. Reverse leakage is limited to ≤0.01 µA at 45.6 V (0.75 × VZ), supporting low-power standby regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 60 V ±5% at 250 mA - defines stable regulation point for 60 V reference or clamping circuits |
| Power Dissipation | 0.5 W at TEC < 100 °C - limits continuous thermal load without derating on standard FR4 layout |
| Zener Impedance ZZT | 400 Ω max at 250 mA - ensures voltage stability under dynamic load changes within spec |
| Reverse Leakage IR | ≤0.01 µA at 45.6 V - enables ultra-low quiescent current operation in battery-backed or standby circuits |
| Noise Density | 1 µV/√Hz typical at 1–3 kHz - supports low-noise analog references where ripple sensitivity matters |
| Operating Temp Range | –65 °C to +175 °C - qualified for extended-range environments including downhole, avionics, and engine control |
| Package | DO-213AA (SOD-80/MELF) glass body - provides hermetic seal, ESD immunity (MIL-STD-750 Method 1020), and MELF mechanical robustness |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass cylindrical package with tin-lead or RoHS-compliant matte-tin end caps; cathode identified by single black band; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower potential node in Zener shunt regulator configuration |
| Cathode | Banded end | Connected to regulated output node; carries full Zener current during regulation; requires thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments (e.g., humidity, salt fog) |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications |
| Tight thermal resistance | 150 °C/W junction-to-end-cap - enables efficient heat transfer to PCB copper pad without heatsink |
| Low capacitance | ~6.4 pF typical - minimizes high-frequency signal coupling and preserves bandwidth in RF-adjacent circuits |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output of isolated DC-DC converters in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Shunt Zener reference in TL431-based feedback loop to maintain ±1% output accuracy across –40 °C to +85 °C. Use Value: 60 V rating allows direct sensing of 48 V bus with margin; hermetic seal prevents calibration drift in factory-floor humidity. |
Use Scenario: Providing stable 60 V bias for radiation-hardened op-amp front-ends in satellite telemetry receivers. IC Role / Device Role / Timing Role: Precision voltage clamp protecting ADC input stages from transient overvoltage events in LEO orbit. Use Value: Inherent radiation hardness and –65 °C to +175 °C operation eliminate need for shielding or derating in vacuum thermal cycling. |
| Medical Imaging HV Bias | Downhole Oilfield Sensor Conditioning |
Use Scenario: Stabilizing bias voltage for photomultiplier tube (PMT) gain control in portable X-ray detectors. IC Role / Device Role / Timing Role: Low-noise (1 µV/√Hz) Zener reference setting PMT dynode chain voltage with minimal signal corruption. Use Value: Ultra-low noise density preserves SNR in weak-signal photon counting; glass package resists sterilization-induced parameter shift. |
Use Scenario: Clamping supply rails in high-temperature pressure transducers deployed at 175 °C wellbore depths. IC Role / Device Role / Timing Role: Overvoltage protector for ASIC power inputs exposed to switching transients in motor-driven logging tools. Use Value: Full –65 °C to +175 °C operational range and 0.5 W power rating enable reliable clamping without thermal shutdown at depth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 62 V ±5%, 1 W power rating, DO-41 axial package, 1000 Ω ZZT | Higher power but larger footprint and higher impedance; not surface-mount or hermetic | Select when board space permits axial mounting and >0.5 W dissipation is required |
| BZX84-C62 | 62 V ±5%, 300 mW, SOT-23 package, 100 Ω ZZT, plastic encapsulation | Lower power, smaller size, but non-hermetic and not radiation-hardened | Select for cost-sensitive consumer designs where ESD and radiation tolerance are not required |
Compared with 1N4128UR/TR, the 1N4749A offers higher power but lacks surface-mount compatibility and hermeticity, while the BZX84-C62 trades radiation hardness and thermal range for compactness and cost - making 1N4128UR/TR uniquely suited for high-reliability, high-temperature, and mission-critical Zener regulation.
Availability
1N4128UR/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage references, medical imaging bias circuits, and downhole sensor conditioning requiring stable component supply across extended temperature and reliability requirements.
Supply support for 1N4128UR/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 1N4128UR/TR belongs to Microsemi's legacy DO-213AA glass Zener family, designed specifically for applications demanding hermetic sealing, extreme temperature operation, and intrinsic radiation tolerance - such as defense, space, oil & gas, and medical equipment.
FAQ
What is the Zener voltage tolerance for 1N4128UR/TR?
The 1N4128UR/TR has a nominal Zener voltage of 60 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 1N4128UR/TR part number.
Is 1N4128UR/TR RoHS compliant?
Yes, the "e3" suffix in 1N4128UR/TR confirms RoHS compliance with annealed matte-tin plating per MIL-STD-750 Method 2026. The device meets EU RoHS Directive 2011/65/EU requirements for lead-free solderability and restricted substance limits.
What does the "TR" suffix mean in 1N4128UR/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-481-1-A standard: 12 mm carrier tape, 2000 units per 7-inch reel. This format supports automated SMT placement and is standard for volume production use of the 1N4128UR/TR.
Can 1N4128UR/TR be used in place of 1N4749A?
No - 1N4128UR/TR is not a drop-in replacement for 1N4749A due to fundamental differences: DO-213AA vs. DO-41 package, 0.5 W vs. 1 W power rating, 400 Ω vs. 1000 Ω Zener impedance, and surface-mount vs. axial-leaded form factor. Board redesign and thermal validation would be required.
What is the maximum reverse leakage current for 1N4128UR/TR at 45.6 V?
The maximum reverse leakage current for 1N4128UR/TR is 0.01 µA at 45.6 V (75% of nominal Zener voltage), as confirmed in the Microsemi electrical characteristics table on page 2 of the datasheet. This ultra-low leakage supports energy-efficient standby regulation.
1N4128UR/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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4128UR/TR FAQ
1.How can I place an order for 1N4128UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4128UR/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/TR reliable?
The price and inventory of 1N4128UR/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/TR is usually 5 days.
3.What payment methods are accepted for 1N4128UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4128UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4128UR/TR?
1N4128UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4128UR/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/TR?
For technical support, including 1N4128UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4128UR/TR requirements.
6.How does Aetrix verify that 1N4128UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4128UR/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/TR meets industry standards.
7.What is the process for return or replacement of 1N4128UR/TR?
All 1N4128UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4128UR/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/TR part is unused and in its original packaging.
Return procedure for 1N4128UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4128UR/TR Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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