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Microchip Technology 1N4128
- Part No.:
- 1N4128
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4128.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
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Product details
Overview
1N4128 from Microsemi is a 500 mW, 60 V metallurgically bonded glass Zener diode in DO-35 package, qualified to JANS level per MIL-PRF-19500/435, with 1% voltage tolerance, 400 Ω dynamic impedance at 250 mA, and +0.100 %/°C temperature coefficient - used for precision voltage regulation in aerospace power supplies and radiation-hardened instrumentation.
For engineers reviewing the 1N4128 datasheet, 1N4128 pinout, 1N4128 application, or 1N4128 equivalent, this page delivers verified electrical specs, military-grade reliability context, thermal derating behavior, noise density (1 μV/√Hz), and direct alternatives for high-reliability analog reference design.
Technical Context
The 1N4128 operates as a reverse-biased Zener regulator with a nominal breakdown voltage of 60.0 V at 250 mA test current (IZT), exhibiting low noise density (1 μV/√Hz) and stable regulation across -65 °C to +175 °C junction temperature range. Its metallurgical bond construction ensures mechanical robustness under thermal cycling and shock.
It features a +0.100 %/°C temperature coefficient above 6.8 V, enabling predictable drift compensation in precision references; maximum reverse leakage is 0.01 µA at VR = 45.6 V, and dynamic impedance (ZZT) is 400 Ω at IZT, confirming tight regulation under load variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 60.0 V at 250 mA - defines precise regulation point for high-voltage reference circuits |
| Power Dissipation | 500 mW at 25 °C - supports stable operation in compact axial-leaded layouts with linear derating to zero at 175 °C |
| Zener Impedance (ZZT) | 400 Ω at 250 mA - ensures minimal output voltage shift under current transients |
| Temp. Coefficient (αVZ) | +0.100 %/°C - enables accurate thermal drift modeling in wide-temperature military systems |
| Noise Density (ND) | 1 μV/√Hz - critical for low-noise analog references in instrumentation and telemetry |
| Reverse Leakage (IR) | 0.01 µA at 45.6 V - guarantees negligible quiescent current in standby-regulation modes |
| Junction Temp. Range | -65 °C to +175 °C - validated for space, avionics, and nuclear instrumentation environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package; cathode indicated by band; banded end is positive during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to system ground or lower-potential rail; reverse bias applied between cathode and anode |
| Cathode | Zener regulation terminal | Banded end; connected to higher-potential supply rail; regulates voltage at cathode-to-anode potential |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANS-level reliability certified for spaceflight and nuclear command systems |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and vibration |
| 1% Zener voltage tolerance | Reduces need for post-calibration trimming in precision reference designs |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - no TID de-rating required up to 100 krad(Si) |
| Low capacitance | Typical <2 pF - preserves high-frequency stability in RF bias and fast-switching regulator feedback paths |
Applications
| Aerospace Power Reference | Nuclear Instrumentation Bias |
|---|---|
Use Scenario: Providing stable 60 V reference in satellite DC-DC converter feedback loops operating across -55 °C to +125 °C. IC Role / Device Role / Timing Role: Zener voltage reference element establishing regulated output setpoint. Use Value: JANS qualification and +0.100 %/°C αVZ enable closed-loop accuracy within ±1.2% over full temperature range without active compensation. | Use Scenario: Biasing photomultiplier tube (PMT) dynode chains in reactor monitoring detectors exposed to gamma flux. IC Role / Device Role / Timing Role: High-voltage, low-drift Zener regulator supplying graded dynode potentials. Use Value: Radiation hardness and 0.01 µA IR ensure stable bias under ionizing dose, preventing gain drift in pulse-height analysis. |
| Avionics Sensor Excitation | High-Reliability Test Equipment |
Use Scenario: Exciting strain-gauge bridges in flight control surface position sensors requiring 60 V excitation with <0.5% long-term drift. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric sensor excitation. Use Value: 1% VZ tolerance and metallurgical bond construction guarantee calibration stability over 10,000 thermal cycles. | Use Scenario: Calibration reference in portable multimeters and automated test equipment requiring traceable 60 V standards. IC Role / Device Role / Timing Role: Primary Zener reference in metrology-grade voltage divider networks. Use Value: 1 μV/√Hz noise density and 400 Ω ZZT support sub-ppm measurement resolution in 6½-digit DMMs. |
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 | Same 60 V Zener, DO-213AA surface-mount package; identical electrical specs but 2.5 mm × 1.3 mm footprint | Replaces axial DO-35 in space-constrained PCBs; requires reflow-compatible layout | Select when automated assembly and board area reduction outweigh manual through-hole serviceability |
| 1N5267B | 60 V Zener, 500 mW, DO-35, but only commercial-grade (no MIL-qual), ±5% tolerance, +0.095 %/°C αVZ | Suitable for industrial controls where JANS reliability and 1% tolerance are not mandated | Choose for cost-sensitive non-military applications with relaxed drift and qualification requirements |
Compared with 1N4128, 1N4128UR-1 offers identical regulation performance in surface-mount form for modern PCBs, while 1N5267B provides a lower-cost commercial alternative lacking radiation hardness, tight tolerance, and military qualification - making it viable only where environmental ruggedness is secondary.
Availability
1N4128 is available at Aetrix Electronics and suitable for aerospace power reference, nuclear instrumentation bias, and avionics sensor excitation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4128 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The 1N4128 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered for voltage reference stability in mission-critical defense, space, and nuclear systems.
FAQ
What is the Zener voltage tolerance for 1N4128?
The 1N4128 has a nominal Zener voltage of 60.0 V with a 1% tolerance (±0.6 V), confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tighter tolerance is achieved via screening and is standard for the "D" suffix variant, distinguishing it from the base 5% tolerance versions in the same series.
Is 1N4128 suitable for radiation-exposed environments?
Yes, the 1N4128 is inherently radiation-hard per Microsemi MicroNote 050 and qualified to JANS level under MIL-PRF-19500/435. It exhibits no functional degradation up to 100 krad(Si) total ionizing dose, making it appropriate for satellite, reactor, and high-altitude avionics applications where 1N4128 must maintain regulation integrity.
What is the maximum reverse leakage current for 1N4128?
The maximum reverse leakage current (IR) for 1N4128 is 0.01 µA measured at VR = 45.6 V, as specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal power loss and stable regulation in high-impedance reference networks where 1N4128 serves as the primary voltage node.
Does 1N4128 require derating above 25 °C ambient?
Yes, the 1N4128's 500 mW power rating linearly derates from 500 mW at 25 °C to zero at 175 °C, per Figure 2 in the datasheet. For example, at 100 °C ambient, its usable power drops to approximately 292 mW - a critical constraint when designing thermal margins for 1N4128 in enclosed enclosures or high-power-density assemblies.
What package options exist for the 1N4128 besides DO-35?
In addition to the standard DO-35 (DO-204AH) axial package, the 1N4128 is available in surface-mount variants: 1N4128UR-1 in DO-213AA and 1PMT4128 in DO-216. These retain identical electrical specifications but differ in mounting method and footprint - all versions share the same 60 V Zener voltage and JANS qualification when ordered with appropriate reliability level suffixes.
1N4128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N4128 FAQ
1.How can I place an order for 1N4128 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4128 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 1N4128 reliable?
The price and inventory of 1N4128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4128 is usually 5 days.
3.What payment methods are accepted for 1N4128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4128 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4128?
1N4128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4128 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 1N4128?
For technical support, including 1N4128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4128 requirements.
6.How does Aetrix verify that 1N4128 is sourced from the original manufacturer or authorized distributors?
All 1N4128 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 1N4128 meets industry standards.
7.What is the process for return or replacement of 1N4128?
All 1N4128 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4128, 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 1N4128 part is unused and in its original packaging.
Return procedure for 1N4128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4128 Tags
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