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Microchip Technology 1N4128-1
- Part No.:
- 1N4128-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4128-1.pdf
- Description:
- DIODE ZENER 60V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,103
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Product details
Overview
1N4128-1 from Microsemi is a 500 mW, 60 V Zener diode in DO-35 glass package, qualified to JANS level per MIL-PRF-19500/435, with 1% voltage tolerance, 400 Ω dynamic impedance at 250 mA, and max reverse current of 0.01 µA at 45.6 V for precision voltage regulation in aerospace power conditioning.
For engineers reviewing the 1N4128-1 datasheet, 1N4128-1 pinout, 1N4128-1 application, or 1N4128-1 equivalent, this part serves as a high-reliability, low-noise, hermetically sealed Zener reference in radiation-hardened, temperature-stable, and ESD-insensitive analog circuits requiring exact 60 V regulation under varying load and thermal conditions.
Technical Context
The 1N4128-1 operates as a reverse-biased voltage reference with metallurgical bonding ensuring stable breakdown characteristics across -65 °C to +175 °C junction temperature range. Its 60 V nominal Zener voltage is specified at 250 mA test current (IZT), with ±1% tolerance and +0.100 %/°C temperature coefficient.
It exhibits 400 Ω dynamic impedance (ZZT) at IZT, 0.01 µA maximum reverse leakage (IR) at 45.6 V (VR), and 6.4 mA maximum Zener current (IZM) - all defined under JEDEC-standard test conditions per MIL-PRF-19500/435.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 60.0 V at 250 mA - precise regulation point for mid-range high-voltage reference circuits |
| Zener Tolerance | ±1% - enables tight-set voltage thresholds without external trimming |
| Power Dissipation | 500 mW - supports stable operation up to 175 °C with linear derating from 25 °C |
| Dynamic Impedance (ZZT) | 400 Ω at 250 mA - low AC impedance ensures minimal output voltage variation under ripple or transient load |
| Reverse Leakage (IR) | 0.01 µA at 45.6 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
| Temp Coefficient (αVZ) | +0.100 %/°C - predictable positive drift simplifies thermal compensation in wide-temperature designs |
| Noise Density (ND) | 1 µV/√Hz - exceptionally low broadband noise for sensitive analog references |
| Junction Temp Range | -65 °C to +175 °C - validated for extreme-environment military and space applications |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with cathode indicated by band; banded end is positive during Zener regulation. Hermetically sealed, tin-lead or RoHS-compliant matte-tin plating, ~0.2 g weight, 1.0–1.5 inch lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lowest potential; defines regulation reference plane |
| Cathode (banded end) | Zener output terminal | Supplies regulated 60 V when reverse-biased; must be held >60 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANS-level reliability verified for flight-critical and nuclear-hardened systems |
| Metallurgically bonded junction | Eliminates interfacial delamination risk under thermal cycling and mechanical shock |
| Ultra-low noise density | 1 µV/√Hz enables use in precision instrumentation front-ends without filtering overhead |
| Hermetic glass seal | Prevents moisture ingress and parameter drift over decades in harsh storage or operational environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - no handling precautions required in assembly |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for LEO/MEO satellite power supervisors |
Applications
| Aerospace Power Supervision | High-Voltage Instrumentation Reference |
|---|---|
Use Scenario: Monitoring 72 V bus in satellite power distribution unit with ±5 V margin. IC Role / Device Role / Timing Role: Primary 60 V Zener reference for comparator threshold generation. Use Value: JANS qualification and -65 °C to +175 °C operation ensure fault-free supervision across orbital thermal cycles. | Use Scenario: Calibrating 100 V full-scale range in portable multimeter analog front-end. IC Role / Device Role / Timing Role: Stable 60 V reference for DAC output scaling and ADC offset correction. Use Value: 1% tolerance and 1 µV/√Hz noise enable <0.02% measurement uncertainty without post-calibration trim. |
| Nuclear Facility Sensor Biasing | Military Radar Bias Supply |
Use Scenario: Providing bias voltage to gamma-ray detector photomultiplier tube anode chain. IC Role / Device Role / Timing Role: Radiation-hardened Zener regulator in high-dose-rate monitoring circuit. Use Value: Inherent radiation tolerance eliminates need for shielding or redundancy, reducing SWaP-C. | Use Scenario: Stabilizing local oscillator supply in airborne pulse-Doppler radar receiver. IC Role / Device Role / Timing Role: Low-noise 60 V reference for GaAs FET drain bias network. Use Value: 400 Ω ZZT and 0.01 µA IR maintain RF stage gain stability despite temperature swings during mission profiles. |
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 electrical specs; DO-213AA surface-mount package instead of DO-35 axial | Requires SMT reflow process; unsuitable for through-hole prototyping or high-vibration mechanical mounting | Select when board space is constrained and automated assembly is used |
| 1N4128-1e3 | Identical DO-35 package and electrical performance; RoHS-compliant matte-tin plating vs. standard tin-lead | Required for commercial-grade RoHS compliance; not qualified to JANTXV/JANS levels | Select for non-military commercial programs needing environmental compliance |
Compared with 1N4128UR-1 and 1N4128-1e3, the 1N4128-1 offers JANS-level qualification and tin-lead termination for legacy military repair and high-reliability through-hole deployment - making it the sole choice where mil-spec traceability and axial mechanical robustness are mandatory.
Availability
1N4128-1 is available at Aetrix Electronics and suitable for aerospace power supervision, high-voltage instrumentation reference, and nuclear facility sensor biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4128-1 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 defense-grade analog and mixed-signal components.
The 1N4128-1 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered for precision voltage regulation in mission-critical systems where parametric stability, hermetic integrity, and extended temperature operation are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4128-1?
The 1N4128-1 has a nominal Zener voltage of 60.0 V with ±1% tolerance, as indicated by the "D" suffix in its nomenclature per Microsemi's part numbering system. This tight tolerance is achieved via post-process screening and is guaranteed across the full operating temperature range of -65 °C to +175 °C. The 1N4128-1 maintains this specification under JEDEC-standard test conditions at 250 mA Zener test current.
Is the 1N4128-1 qualified for space applications?
Yes, the 1N4128-1 is qualified to JANS level per MIL-PRF-19500/435, which includes rigorous testing for radiation hardness, thermal cycling, mechanical shock, and hermeticity - all required for space-grade components. Its inherent radiation tolerance is documented in Microsemi MicroNote 050, confirming suitability for LEO and MEO satellite power supervision circuits. The 1N4128-1 meets these requirements without derating or additional shielding.
What is the maximum reverse leakage current for the 1N4128-1?
The 1N4128-1 has a maximum reverse leakage current (IR) of 0.01 µA measured at 45.6 V reverse voltage (VR), per the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This ultra-low leakage is critical for maintaining regulation accuracy in high-impedance bias networks and ensures minimal error contribution in precision reference designs using the 1N4128-1.
Does the 1N4128-1 have RoHS-compliant variants?
Yes - the 1N4128-1e3 variant features RoHS-compliant annealed matte-tin plating and meets commercial-grade environmental requirements, but it is not qualified to JAN, JANTX, JANTXV, or JANS levels. The standard 1N4128-1 uses tin-lead plating and retains full mil-spec qualification. Both share identical electrical parameters; only plating and qualification level differ. Always verify compliance requirements before selecting between 1N4128-1 and 1N4128-1e3.
What package type does the 1N4128-1 use?
The 1N4128-1 uses the DO-35 (also designated DO-204AH) axial-leaded, hermetically sealed glass package. It features a cathode band for polarity identification, ~0.2 g mass, and 1.0–1.5 inch lead length. Dimensions comply with MIL-STD-1835, and the package is rated for soldering at 260 °C for 10 seconds. This package is distinct from surface-mount variants like 1N4128UR-1 (DO-213AA).
1N4128-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4128-1 FAQ
1.How can I place an order for 1N4128-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4128-1 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 1N4128-1 reliable?
The price and inventory of 1N4128-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4128-1 is usually 5 days.
3.What payment methods are accepted for 1N4128-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4128-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4128-1?
1N4128-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4128-1 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 1N4128-1?
For technical support, including 1N4128-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4128-1 requirements.
6.How does Aetrix verify that 1N4128-1 is sourced from the original manufacturer or authorized distributors?
All 1N4128-1 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 1N4128-1 meets industry standards.
7.What is the process for return or replacement of 1N4128-1?
All 1N4128-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4128-1, 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 1N4128-1 part is unused and in its original packaging.
Return procedure for 1N4128-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4128-1 Tags
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