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Microchip Technology 1N4123-1
- Part No.:
- 1N4123-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4123-1.pdf
- Description:
- DIODE ZENER 39V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,704
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Product details
Overview
1N4123-1 from Microsemi is a 500 mW, 39.0 V ±5% axial-leaded Zener diode in DO-35 (DO-204AH) glass package, metallurgically bonded for high-reliability voltage regulation in aerospace and defense systems. It delivers 29.7 mA maximum Zener current at 25 °C, exhibits 200 Ω dynamic impedance at 250 mA test current, and operates across –65 to +175 °C junction temperature range.
For engineers reviewing the 1N4123-1 datasheet, 1N4123-1 pinout, 1N4123-1 application, or 1N4123-1 equivalent, this page provides verified electrical parameters, MIL-PRF-19500/435 qualification levels (JAN/JANTX/JANTXV/JANS), thermal derating behavior, noise density (1 µV/√Hz), and RoHS-compliant commercial variants.
Technical Context
The 1N4123-1 functions as a precision shunt voltage regulator with a nominal Zener voltage of 39.0 V at 250 mA test current (IZT), exhibiting a positive temperature coefficient of +0.095 %/°C. Its metallurgical bond construction ensures stable breakdown characteristics under thermal cycling and radiation exposure.
It maintains ≤0.01 µA reverse leakage current at VR = 31.2 V and achieves 200 Ω dynamic impedance (ZZT) under 10% AC modulation at IZT. The device is rated for 500 mW average power dissipation at 25 °C lead temperature, linearly derated to zero at 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39.0 V at 250 mA - defines precise regulation point for feedback loops and reference circuits |
| Power Dissipation (PM(AV)) | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal shutdown |
| Dynamic Impedance (ZZT) | 200 Ω at 250 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | ≤0.01 µA at 31.2 V - ensures minimal standby current in high-impedance bias networks |
| Noise Density (ND) | 1 µV/√Hz - enables low-noise voltage references in precision analog signal chains |
| Temp Coefficient (αVZ) | +0.095 %/°C - quantifies voltage drift over temperature for system-level compensation |
| Junction Temp Range | –65 to +175 °C - supports operation in extreme environments including space and military platforms |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during Zener operation; used for forward-bias testing |
| Cathode (banded end) | Zener regulation terminal | Connected to higher-potential node; reverse-biased to maintain 39.0 V reference at load |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | Available up to JANS level - guarantees performance in radiation-hardened, high-reliability aerospace systems |
| Metallurgical bonding | Eliminates interfacial delamination risk - ensures long-term parameter stability under thermal shock |
| Low noise density | 1 µV/√Hz at 39 V - supports use in precision ADC references and low-drift op-amp biasing |
| Hermetic glass seal | Prevents moisture ingress - maintains electrical integrity in humid or vacuum environments |
| ESD immunity | Non-sensitive per MIL-STD-750 method 1020 - simplifies handling without special ESD controls |
Applications
| Aerospace Power Regulation | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary rail voltage in satellite power distribution units exposed to wide thermal swings. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining 39.0 V output despite input variations and radiation-induced parametric shifts. Use Value: JANS qualification and +0.095 %/°C tempco enable closed-loop compensation in flight-critical subsystems. | Use Scenario: Providing stable bias voltage for RF front-end amplifiers in radar receivers operating at –55 to +125 °C ambient. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing gain control circuitry against temperature and aging effects. Use Value: 1 µV/√Hz noise density preserves SNR in low-phase-noise local oscillator designs. |
| Industrial Sensor Excitation | Medical Imaging Bias Supply |
Use Scenario: Exciting strain gauge bridges in oil & gas downhole tools where reliability exceeds commercial-grade requirements. IC Role / Device Role / Timing Role: Fixed-voltage source delivering repeatable excitation independent of supply ripple or load changes. Use Value: 200 Ω ZZT ensures <±0.5% output variation across 1–30 mA load range in harsh vibration environments. | Use Scenario: Generating calibrated high-voltage bias for photomultiplier tube (PMT) anodes in PET/CT scanners. IC Role / Device Role / Timing Role: Stable 39.0 V reference enabling consistent electron multiplication gain across detector channels. Use Value: Hermetic DO-35 package prevents parameter drift due to humidity-induced leakage in sealed imaging enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 39 V ±5%, 1 W rating, DO-41 package, no MIL qualification | Commercial industrial use only; lacks radiation hardness and extended temperature validation | Select when cost sensitivity outweighs reliability requirements and PCB layout allows larger DO-41 footprint |
| SMF39A | 39 V ±5%, 400 W peak power, SOD-123FL surface-mount package, AEC-Q101 qualified | Automotive transient suppression; not optimized for low-noise reference use | Select for space-constrained automotive ECUs requiring surge immunity, not precision regulation |
Compared with 1N4123-1, 1N4749A offers higher power but no military qualification or low-noise performance, while SMF39A prioritizes surge robustness over voltage stability-making 1N4123-1 uniquely suited for high-reliability analog references where noise, tempco, and radiation tolerance are critical.
Availability
1N4123-1 is available at Aetrix Electronics and suitable for aerospace power regulation, defense system reference, and industrial sensor excitation requiring stable component supply across JAN, JANTX, JANTXV, and JANS reliability levels.
Supply support for 1N4123-1 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 semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance and extended temperature operation.
The 1N4123-1 belongs to Microsemi's legacy MIL-qualified Zener diode family engineered specifically for voltage reference stability in mission-critical systems where parameter drift, noise, and environmental resilience are non-negotiable.
FAQ
What is the Zener voltage tolerance for the 1N4123-1?
The 1N4123-1 has a nominal Zener voltage of 39.0 V with a standard tolerance of ±5% at 250 mA test current (IZT), per JEDEC registration and Microsemi T4-LDS-0245-2 specification. This tolerance applies to all reliability levels (JAN through JANS) unless tighter tolerances (2% or 1%) are explicitly ordered with suffixes C or D.
Does the 1N4123-1 meet MIL-PRF-19500/435 requirements?
Yes, the 1N4123-1 is qualified per MIL-PRF-19500/435 at JAN, JANTX, JANTXV, and JANS levels. This certification covers electrical performance, environmental stress screening, and reliability testing including thermal cycling, burn-in, and radiation exposure - confirming suitability for high-integrity defense and space applications.
What is the maximum Zener current (IZM) for the 1N4123-1 at 25 °C?
The 1N4123-1 supports a maximum Zener current (IZM) of 29.7 mA at 25 °C lead temperature, derived from its 500 mW power rating and 39.0 V Zener voltage (IZM = PM(AV)/VZ). This value assumes thermal equilibrium on FR4 board with specified copper pad geometry per Microsemi's derating curve.
Is the 1N4123-1 available in RoHS-compliant form?
Yes, RoHS-compliant versions of the 1N4123-1 are available for commercial-grade orders only, marked with the "e3" suffix (e.g., 1N4123-1e3). These retain identical electrical specifications but feature annealed matte-tin plating instead of tin-lead, and are not qualified to JAN/JANTX/JANTXV/JANS levels.
How does the temperature coefficient of the 1N4123-1 affect its voltage stability?
The 1N4123-1 has a temperature coefficient (αVZ) of +0.095 %/°C, meaning its Zener voltage increases by approximately 37.05 mV per °C rise above 25 °C. This predictable positive drift enables system-level compensation in precision references, especially when paired with negative-coefficient components in hybrid voltage references.
1N4123-1 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 29.7 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)
1N4123-1 FAQ
1.How can I place an order for 1N4123-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4123-1 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 1N4123-1 reliable?
The price and inventory of 1N4123-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4123-1 is usually 5 days.
3.What payment methods are accepted for 1N4123-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4123-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4123-1?
1N4123-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4123-1 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 1N4123-1?
For technical support, including 1N4123-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4123-1 requirements.
6.How does Aetrix verify that 1N4123-1 is sourced from the original manufacturer or authorized distributors?
All 1N4123-1 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 1N4123-1 meets industry standards.
7.What is the process for return or replacement of 1N4123-1?
All 1N4123-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4123-1, 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 1N4123-1 part is unused and in its original packaging.
Return procedure for 1N4123-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4123-1 Tags
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