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Microchip Technology 1N4126-1
- Part No.:
- 1N4126-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4126-1.pdf
- Description:
- DIODE ZENER 51V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
1N4126-1 from Microsemi is a 500 mW, 51.0 V Zener diode in DO-35 glass package, qualified to JANS level per MIL-PRF-19500/435, with ±5% voltage tolerance, 300 Ω dynamic impedance at 250 mA, and max 0.01 µA reverse leakage at 38.8 V, used for precision voltage regulation in aerospace power supplies.
For engineers reviewing the 1N4126-1 datasheet, 1N4126-1 pinout, 1N4126-1 application, or 1N4126-1 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 1N4126-1 operates as a metallurgically bonded, hermetically sealed Zener regulator with fixed 51.0 V nominal breakdown voltage at 250 mA test current. Its temperature coefficient is +0.100 %/°C, indicating positive drift over temperature, and it exhibits 300 Ω dynamic impedance (ZZT) under standard 10% AC modulation at IZT.
Designed for stable regulation across wide current ranges (IZK to IZM = 38.8 mA), it supports operation from –65 °C to +175 °C junction temperature, with thermal resistance of 250 °C/W junction-to-lead (3/8″ lead length) and 300 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 51.0 V at 250 mA - defines precise regulation point for reference circuits |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power before thermal derating begins at 50 °C |
| Dynamic Impedance ZZT | 300 Ω at 250 mA - determines output voltage stability under load transients |
| Reverse Leakage IR | 0.01 µA at 38.8 V - ensures minimal error current in high-impedance bias networks |
| Noise Density ND | 1 µV/√Hz - enables low-noise analog references in precision instrumentation |
| Temp Coefficient αVZ | +0.100 %/°C - quantifies predictable positive VZ drift for temperature-compensated designs |
| Junction Temp Range | –65 °C to +175 °C - supports operation in extreme environments including space and avionics |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to circuit common; reverse-biased configuration requires cathode at higher potential |
| Cathode | Zener regulation node | Banded end; held at regulated 51.0 V above anode when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables JANS-level reliability and radiation hardness per MicroNote 050 |
| Low noise density | 1 µV/√Hz at 51 V - critical for low-drift voltage references in test equipment |
| MIL-PRF-19500/435 qualification | Validated for JAN/JANTX/JANTXV/JANS levels - meets screening requirements for flight hardware |
| Minimal capacitance | ~2.5 pF (typical, per Figure 3 extrapolation) - preserves high-frequency stability in RF bias networks |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates handling safeguards in cleanroom assembly |
Applications
| Aerospace Power Reference | Avionics Voltage Clamp |
|---|---|
Use Scenario: Stable 51 V reference in satellite power conditioning units requiring long-term drift stability and radiation tolerance. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for DC-DC converter feedback loops. Use Value: JANS qualification and +0.100 %/°C tempco allow closed-loop compensation without external sensors. | Use Scenario: Overvoltage protection clamp on 48 V aircraft bus lines exposed to load dump transients. IC Role / Device Role / Timing Role: Passive shunt regulator absorbing surge energy above 51 V threshold. Use Value: 500 mW rating and 300 Ω ZZT ensure clamping without thermal runaway during 100 ms surges. |
| Test Equipment Calibration | Radiation-Hardened Sensor Bias |
Use Scenario: Precision voltage standard in portable multimeter calibration modules operating from –40 °C to +85 °C. IC Role / Device Role / Timing Role: Low-noise (1 µV/√Hz), low-leakage (0.01 µA) Zener reference source. Use Value: Enables sub-0.1% absolute accuracy over temperature without active compensation circuitry. | Use Scenario: Bias supply for radiation-detection photodiodes in nuclear reactor monitoring systems. IC Role / Device Role / Timing Role: Regulated bias generator maintaining constant 51 V despite total ionizing dose exposure. Use Value: Inherent radiation hardness eliminates need for shielding or redundant regulators in Class 1E safety systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4126UR-1 | Same 51 V Zener, DO-213AA surface-mount package instead of DO-35 axial | Requires PCB rework for SMT assembly; no axial through-hole mounting option | Select when automated pick-and-place and board space constraints outweigh manual assembly needs |
| 1N5255B | 51 V Zener, ±5% tolerance, but only commercial-grade (no MIL-qualified variants), 500 mW, DO-35 | Lacks JANS/JANTXV screening, radiation hardness, and guaranteed 0.01 µA IR spec | Acceptable for industrial bench instruments where cost and availability outweigh mission-critical reliability |
Compared with 1N4126-1, the 1N4126UR-1 offers identical regulation performance in a compact SMT form factor but forfeits axial-leaded flexibility, while the 1N5255B provides cost-effective commercial replacement without military screening, thermal robustness, or guaranteed low-noise operation.
Availability
1N4126-1 is available at Aetrix Electronics and suitable for aerospace power reference, avionics voltage clamp, and test equipment calibration requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for 1N4126-1 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4126-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where radiation tolerance, thermal stability, and long-term parametric consistency are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4126-1?
The 1N4126-1 has a nominal Zener voltage of 51.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. No tighter tolerance (e.g., 2% or 1%) is listed for this specific part number in the documentation.
Is 1N4126-1 suitable for surface-mount assembly?
No - the 1N4126-1 is packaged in the axial-leaded DO-35 (DO-204AH) glass case. For surface-mount use, Microsemi offers the functionally equivalent 1N4126UR-1 in DO-213AA package. The 1N4126-1 requires through-hole mounting with appropriate lead forming and soldering per MIL-STD-750 Method 2026.
What is the maximum reverse leakage current for 1N4126-1?
The maximum reverse leakage current (IR) for 1N4126-1 is 0.01 µA measured at 38.8 V (76% of VZ), per the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This ultra-low leakage supports high-impedance bias networks in precision analog circuits.
Does 1N4126-1 have radiation hardness certification?
Yes - the 1N4126-1 is inherently radiation hard as described in Microsemi MicroNote 050, a documented characteristic of its metallurgically bonded construction and hermetic DO-35 packaging. This property is retained across all qualified levels (JAN through JANS) and does not require separate test reporting.
What is the thermal derating behavior of 1N4126-1?
The 1N4126-1 linearly derates from 500 mW starting at 50 °C lead temperature (TL), reaching zero dissipation at 175 °C. On a typical FR4 board, derating begins at 25 °C ambient (TA), per Figure 2 in T4-LDS-0245-2 Rev. 1. Junction-to-lead thermal resistance is 250 °C/W with 3/8″ lead length.
1N4126-1 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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 38.8 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)
1N4126-1 FAQ
1.How can I place an order for 1N4126-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4126-1 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 1N4126-1 reliable?
The price and inventory of 1N4126-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4126-1 is usually 5 days.
3.What payment methods are accepted for 1N4126-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4126-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4126-1?
1N4126-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4126-1 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 1N4126-1?
For technical support, including 1N4126-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4126-1 requirements.
6.How does Aetrix verify that 1N4126-1 is sourced from the original manufacturer or authorized distributors?
All 1N4126-1 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 1N4126-1 meets industry standards.
7.What is the process for return or replacement of 1N4126-1?
All 1N4126-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4126-1, 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 1N4126-1 part is unused and in its original packaging.
Return procedure for 1N4126-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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