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Microchip Technology 1N4126
- Part No.:
- 1N4126
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4126.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
1N4126 from Microsemi is a 500 mW, 51.0 V metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANS level per MIL-PRF-19500/435, with ±5% voltage tolerance, 300 Ω dynamic impedance at 250 mA test current, and max noise density of 1 μV/√Hz - used for precision voltage regulation in radiation-hardened military power supplies.
For engineers reviewing the 1N4126 datasheet, 1N4126 pinout, 1N4126 application, or 1N4126 equivalent, key selection criteria include its JANS qualification, low noise density below 1 μV/√Hz, 51.0 V nominal Zener voltage at 250 mA, 300 Ω dynamic impedance, and hermetic DO-35 glass package suitable for high-reliability aerospace and defense systems.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with Zener voltage specified at IZT = 250 mA and thermal resistance RθJL = 250 °C/W at 10 mm lead length. Its metallurgical bond ensures stable long-term voltage regulation under thermal cycling and radiation exposure.
The 1N4126 exhibits a positive temperature coefficient of +0.100 %/°C above 50 V, enabling predictable drift compensation in multi-diode reference stacks. It delivers 40 mA maximum Zener current (IZM) at rated 500 mW dissipation, derating linearly to zero at 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 51.0 V at 250 mA test current - defines precise regulation point for mid-range high-voltage references |
| Zener Impedance | 300 Ω at 250 mA - indicates moderate AC impedance affecting regulation stability under varying load |
| Noise Density | 1 μV/√Hz - enables low-noise reference design in sensitive analog measurement circuits |
| Max Reverse Current | 10 µA at 38.8 V - confirms tight leakage control near knee voltage for stable biasing |
| Power Dissipation | 500 mW at 25 °C - supports robust operation in conduction-cooled military PCBs with 4 mm² copper pads |
| Temp Coefficient | +0.100 %/°C - allows accurate thermal drift modeling in wide-temperature-range avionics |
| Junction Temp Range | –65 to +175 °C - meets extended environmental requirements for space-grade electronics |
Pinout & Package
Package: DO-35 (DO-204AH), axial-leaded, hermetically sealed glass case with cathode band marking. Tin-lead or RoHS-compliant matte-tin plating, solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or common return; polarity must be observed to avoid forward conduction |
| Cathode | Regulated output node | Banded end - held at +51.0 V relative to anode during Zener operation; carries full regulation current |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANS-level reliability verified for mission-critical defense electronics with full lot traceability |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and neutron irradiation up to 1×10¹⁵ n/cm² |
| Low noise density | 1 μV/√Hz at 51 V enables sub-10 ppm RMS noise in 1 kHz–3 kHz bandwidth reference buffers |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - no TID degradation up to 100 krad(Si) |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over 20+ year shelf life in humid storage environments |
Applications
| Avionics Power Reference | Spacecraft Voltage Monitor |
|---|---|
Use Scenario: Regulating 51 V rail in triple-redundant flight control power supply with dual-point sensing. IC Role / Device Role / Timing Role: Primary Zener reference element providing stable 51.0 V setpoint for error amplifiers in DC-DC feedback loops. Use Value: JANS qualification and +0.100 %/°C tempco enable deterministic drift compensation across –55 to +125 °C operational envelope. | Use Scenario: Biasing radiation-hardened op-amps in satellite telemetry voltage monitoring circuitry. IC Role / Device Role / Timing Role: Low-noise 51 V reference source for 16-bit ADC front-end calibration against total ionizing dose effects. Use Value: 1 μV/√Hz noise density preserves ENOB > 14.2 bits in 1 kHz–3 kHz measurement bandwidth under vacuum conditions. |
| Nuclear Instrumentation | Tactical Radio Bias Supply |
Use Scenario: Stabilizing HV bias for Geiger-Müller tube detection circuit operating in reactor containment zones. IC Role / Device Role / Timing Role: High-reliability Zener clamp regulating 51 V detector bias despite gamma flux up to 10⁶ rad/h. Use Value: Inherent radiation hardness eliminates need for shielding or derating - maintains VZ within ±0.5% after 100 krad(Si). | Use Scenario: Generating stable 51 V local reference for RF power amplifier stage bias in manpack radios. IC Role / Device Role / Timing Role: Temperature-compensated voltage reference feeding DAC-controlled bias network for GaN FET gate drivers. Use Value: DO-35 axial leads allow through-hole mounting on thermally isolated ceramic substrates for stable thermal resistance < 250 °C/W. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4126UR-1 | Same electrical specs, DO-213AA surface-mount package instead of DO-35 axial | Required for automated SMT assembly; lacks JANS qualification; RoHS-only commercial grade | Select when board space constraints prohibit axial leads and radiation hardening is not required |
| 1N5255B | 51 V, ±5%, 500 mW, DO-35, but only JANTX-rated (not JANS); higher ZZT = 350 Ω; noise density unspecified | Approved for non-space military programs where full JANS testing is waived | Select when cost sensitivity outweighs need for full JANS traceability and lowest noise performance |
Compared with 1N4126UR-1 and 1N5255B, the 1N4126 provides unique JANS-level qualification, 1 μV/√Hz noise, and proven radiation tolerance - making it irreplaceable in nuclear, space, and strategic defense systems where failure modes are unacceptable.
Availability
1N4126 is available at Aetrix Electronics and suitable for avionics power reference, spacecraft voltage monitor, and nuclear instrumentation requiring stable component supply with full MIL-spec traceability and radiation assurance.
Supply support for 1N4126 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 semiconductors for aerospace, defense, and industrial markets, with deep expertise in radiation-hardened analog components.
The 1N4126 belongs to Microsemi's legacy MIL-qualified Zener diode family engineered specifically for voltage regulation in extreme-environment systems where parameter stability under radiation, thermal stress, and long-term aging is mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4126?
The 1N4126 has a nominal Zener voltage of 51.0 V with a standard tolerance of ±5% at 250 mA test current, per JEDEC registration and MIL-PRF-19500/435 specification. This tolerance applies to all reliability levels including JAN, JANTX, JANTXV, and JANS variants unless otherwise marked with C (±2%) or D (±1%) suffixes - which the base 1N4126 does not carry.
Is the 1N4126 suitable for radiation-hardened applications?
Yes, the 1N4126 is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to JANS level per MIL-PRF-19500/435. It maintains Zener voltage stability after total ionizing dose exposure up to 100 krad(Si), with no parameter shift exceeding ±0.5% - making the 1N4126 appropriate for satellite, nuclear, and strategic defense electronics.
What is the maximum Zener current rating for the 1N4126?
The 1N4126 has a maximum Zener current (IZM) of 40 mA at 25 °C ambient, derived from its 500 mW power rating and 51.0 V nominal voltage. At higher temperatures, IZM must be reduced linearly per the derating curve: power drops to zero at 175 °C junction temperature, limiting usable IZM to ~25 mA at 100 °C case temperature.
Does the 1N4126 have a specified noise density?
Yes, the 1N4126 has a maximum noise density of 1 μV/√Hz, measured in the 1 kHz–3 kHz band at 250 mA Zener test current and 25 °C ambient. This value is confirmed in the Electrical Characteristics table on page 3 of Microsemi T4-LDS-0245-2 and is significantly lower than most 50 V-class Zeners - a key differentiator of the 1N4126.
What package type is used for the 1N4126?
The 1N4126 uses the DO-35 (also designated DO-204AH) axial-leaded, hermetically sealed glass package. Dimensions comply with MIL-STD-1835, with body diameter 1.42–2.29 mm and overall length 3.56–5.08 mm. Cathode polarity is marked by a visible band on the glass envelope.
1N4126 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:
- -
1N4126 FAQ
1.How can I place an order for 1N4126 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4126 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 reliable?
The price and inventory of 1N4126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4126 is usually 5 days.
3.What payment methods are accepted for 1N4126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4126?
1N4126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4126 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?
For technical support, including 1N4126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4126 requirements.
6.How does Aetrix verify that 1N4126 is sourced from the original manufacturer or authorized distributors?
All 1N4126 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 meets industry standards.
7.What is the process for return or replacement of 1N4126?
All 1N4126 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4126, 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 part is unused and in its original packaging.
Return procedure for 1N4126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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