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Microchip Technology 1N4124
- Part No.:
- 1N4124
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4124.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
1N4124 from Microsemi is a 500 mW, 43.0 V Zener diode in DO-35 glass package, qualified to JANS level per MIL-PRF-19500/435, with 1% voltage tolerance, 250 Ω dynamic impedance at 250 mA test current, and max noise density of 1 µV/√Hz - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4124 datasheet, 1N4124 pinout, 1N4124 application, or 1N4124 equivalent, this page delivers verified electrical specs, military-grade reliability context, thermal derating behavior, noise performance data, and direct alternatives for high-reliability analog reference design.
Technical Context
The 1N4124 operates as a reverse-biased Zener regulator with metallurgically bonded junction, enabling stable voltage reference across -65 °C to +175 °C ambient range. Its 43.0 V nominal Zener voltage is specified at 250 mA test current (IZT), with temperature coefficient of +0.095 %/°C and dynamic impedance of 250 Ω measured at 10% rms modulation.
It exhibits ultra-low reverse leakage (≤0.01 µA at VR = 34.4 V), minimal capacitance (~8.9 pF), and inherent radiation hardness per Microsemi MicroNote 050. The DO-35 package supports axial-leaded mounting with cathode band polarity marking and tin-lead or RoHS-compliant matte-tin plating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 43.0 V ±1% at IZT = 250 mA - defines precise regulation point for reference supply rails |
| Power Dissipation | 500 mW at TC = 25 °C, linearly derated to zero at 175 °C - sets thermal layout constraints on PCB copper area |
| Dynamic Impedance ZZT | 250 Ω at IZT = 250 mA - determines output voltage variation under load transients |
| Noise Density ND | 1 µV/√Hz - enables low-noise analog references in precision instrumentation |
| Reverse Leakage IR | ≤0.01 µA at VR = 34.4 V - ensures minimal quiescent current in standby mode |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies drift over operating temperature range for stability budgeting |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extended-environment avionics and downhole systems |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package; cathode indicated by single black band; leads tinned with annealed matte-tin (RoHS) or tin-lead (non-RoHS); weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener cathode reference ground | Connected to system ground or low-impedance return path during regulation |
| Cathode (banded end) | Zener breakdown terminal / regulated output node | Provides stable 43.0 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | Qualified to JANS level - meets screening, testing, and traceability requirements for spaceflight and defense programs |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling - critical for long-term reliability in harsh environments |
| Ultra-low noise density | 1 µV/√Hz at 43 V - enables use in low-drift analog front-ends without external filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over decades - validated for >20-year field life |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for satellite power subsystems |
Applications
| Aerospace Power Reference | Defense System Voltage Monitor |
|---|---|
|
Use Scenario: Stable 43 V reference in satellite DC-DC converter feedback loop under thermal vacuum and radiation exposure. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for error amplifier input. Use Value: JANS qualification and radiation hardness ensure regulation stability over mission lifetime without recalibration. |
Use Scenario: Overvoltage detection circuit in tactical radio power management unit operating from 28 V aircraft bus. IC Role / Device Role / Timing Role: Precision shunt regulator triggering comparator at 43 V threshold. Use Value: 1% tolerance and <0.01 µA leakage enable accurate trip-point setting with minimal false alarms. |
| Downhole Instrumentation Bias | Avionics Test Equipment Calibration |
|
Use Scenario: High-temperature bias source for pressure sensor signal conditioning in oil/gas well logging tools (175 °C ambient). IC Role / Device Role / Timing Role: Zener voltage reference maintaining accuracy across extreme thermal excursions. Use Value: -65 °C to +175 °C junction rating and +0.095 %/°C tempco allow predictable drift compensation in firmware. |
Use Scenario: Calibration standard in benchtop multimeter reference chain requiring traceable 43 V output. IC Role / Device Role / Timing Role: Primary shunt reference element in metrology-grade voltage divider network. Use Value: Low 250 Ω dynamic impedance and 1 µV/√Hz noise support sub-ppm measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4124US | Same electrical specs, but in surface-mount DO-213AA package - no axial leads, smaller footprint | Used where board space is constrained and reflow soldering is required instead of through-hole assembly | Select 1N4124US when migrating to SMT production or reducing mechanical stress on leads |
| 1N4124-1 | Identical to 1N4124 except for dash-1 suffix denoting MIL-STD-750 test compliance documentation format | No functional difference; used interchangeably in JANS-certified BOMs where documentation traceability is mandated | Choose 1N4124-1 when procurement requires explicit MIL-STD-750 test report linkage |
Compared with 1N4124US and 1N4124-1, the 1N4124 offers identical regulation performance in the legacy DO-35 through-hole package - optimal for prototyping, repair, and high-vibration environments where axial lead retention is preferred.
Availability
1N4124 is available at Aetrix Electronics and suitable for aerospace power reference, defense system voltage monitor, and downhole instrumentation bias requiring stable component supply with full MIL-PRF-19500/435 traceability.
Supply support for 1N4124 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 emphasis on radiation-hardened and mil-spec components.
The 1N4124 belongs to Microsemi's legacy 1N4099–1N4135 Zener series - engineered specifically for precision voltage regulation in mission-critical analog systems where long-term stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4124?
The 1N4124 has a nominal Zener voltage of 43.0 V with ±1% tolerance, confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tight tolerance is achieved via post-process sorting and applies at IZT = 250 mA and 25 °C ambient. The 1N4124 achieves this spec without external trimming, supporting high-accuracy reference designs.
Is the 1N4124 qualified to JANS level?
Yes, the 1N4124 is qualified to JANS level per MIL-PRF-19500/435, as stated in the DESCRIPTION section on page 1 of the datasheet. JANS qualification includes rigorous screening for burn-in, temperature cycling, and hermeticity - making the 1N4124 suitable for spaceflight and nuclear command systems where zero-defect reliability is enforced.
What is the maximum reverse leakage current for the 1N4124?
The maximum reverse leakage current (IR) for the 1N4124 is 0.01 µA at VR = 34.4 V, per the Electrical Characteristics table on page 3. This ultra-low leakage ensures minimal current draw in standby regulation modes and supports high-impedance sensing circuits where loading must be avoided - a key advantage over commercial-grade Zeners.
Does the 1N4124 have radiation hardness?
Yes, the 1N4124 exhibits inherent radiation hardness as documented in Microsemi MicroNote 050, referenced on page 1 of the datasheet. Its metallurgically bonded structure and glass encapsulation provide tolerance to total ionizing dose (TID), enabling use in satellite power systems without additional shielding or derating - a verified characteristic of the entire 1N4099–1N4135 family.
What is the thermal resistance junction-to-lead for the 1N4124?
The thermal resistance junction-to-lead (RθJL) for the 1N4124 is 250 °C/W, measured with 3/8 inch (10 mm) lead length from body, per the Maximum Ratings table on page 1. This value informs heatsinking decisions: for example, at 500 mW dissipation, junction temperature rise above lead temperature is 125 °C - requiring careful lead routing and copper pour design to maintain safe TJ.
1N4124 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:
- -
1N4124 FAQ
1.How can I place an order for 1N4124 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4124 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 1N4124 reliable?
The price and inventory of 1N4124 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4124 is usually 5 days.
3.What payment methods are accepted for 1N4124?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4124 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4124?
1N4124 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4124 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 1N4124?
For technical support, including 1N4124 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4124 requirements.
6.How does Aetrix verify that 1N4124 is sourced from the original manufacturer or authorized distributors?
All 1N4124 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 1N4124 meets industry standards.
7.What is the process for return or replacement of 1N4124?
All 1N4124 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4124, 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 1N4124 part is unused and in its original packaging.
Return procedure for 1N4124:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4124 Tags
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