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Microchip Technology 1N4123
- Part No.:
- 1N4123
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4123.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,530
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Product details
Overview
1N4123 from Microsemi is a 500 mW, 39.0 V metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANS level per MIL-PRF-19500/435. It delivers ±5% Zener voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and 9.8 mA maximum Zener current, used for precision voltage regulation in high-reliability military and aerospace power supplies.
For engineers reviewing the 1N4123 datasheet, 1N4123 pinout, 1N4123 application, or 1N4123 equivalent, this page provides verified electrical parameters, thermal derating behavior, noise density (1 µV/√Hz), temperature coefficient (+0.095 %/°C), and mil-spec qualification details essential for radiation-hardened, high-stability reference design.
Technical Context
This Zener diode operates in reverse breakdown with cathode band indicating polarity and requires operation with banded end positive relative to anode. Its metallurgical bond ensures low noise and stable regulation across -65 °C to +175 °C junction temperature range.
Thermal resistance is 250 °C/W junction-to-lead (at 10 mm lead length) and 300 °C/W junction-to-ambient on FR4 board. Power dissipation linearly derates from 500 mW at 25 °C ambient to zero at 175 °C, with forward voltage of 1.1 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 39.0 V at 250 mA test current - defines precise regulation point for feedback loops |
| Zener Impedance ZZT | 200 Ω - limits output voltage variation under load current changes |
| Max Reverse Current IR | 0.01 µA at 31.2 V - ensures minimal leakage in high-impedance bias networks |
| Noise Density ND | 1 µV/√Hz - enables low-noise reference use in precision analog circuits |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies drift magnitude over operating temperature range |
| Max Zener Current IZM | 29.7 mA - sets upper current limit before exceeding 500 mW power rating |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extreme environmental conditions |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by band; weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal negative relative to cathode |
| Cathode (banded end) | Regulated output node | Provides stable 39.0 V reference when reverse-biased; polarity marking critical for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low-noise performance (1 µV/√Hz) and long-term stability under thermal cycling |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANS level for space-grade and defense-critical systems |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift in humid or corrosive environments |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for satellite and nuclear applications |
| Low capacitance | Typical <1.5 pF - minimizes high-frequency loading in RF bias and timing circuits |
Applications
| Avionics Power Reference | Satellite Voltage Monitor |
|---|---|
Use Scenario: Regulating reference voltage for ADCs and DACs in flight control computers. IC Role / Device Role / Timing Role: Precision Zener reference source for analog signal conditioning subsystems. Use Value: ±5% VZ tolerance and +0.095 %/°C TC ensure stable 39.0 V reference across -55 °C to +125 °C operational range. | Use Scenario: Providing stable bias for radiation-hardened op-amps in onboard telemetry units. IC Role / Device Role / Timing Role: Low-noise (1 µV/√Hz), high-reliability voltage clamp in sensor interface circuits. Use Value: Metallurgical bond and hermetic DO-35 package maintain regulation integrity after total ionizing dose exposure. |
| Nuclear Instrumentation Supply | Missile Guidance Bias Network |
Use Scenario: Generating fixed reference for gamma spectrometer front-end amplifiers. IC Role / Device Role / Timing Role: High-temperature-stable Zener element in analog front-end calibration paths. Use Value: -65 °C to +175 °C junction rating and JANS qualification support operation inside reactor containment zones. | Use Scenario: Setting threshold voltages for comparator-based fault detection in guidance electronics. IC Role / Device Role / Timing Role: Temperature-compensated voltage reference in safety-critical monitoring circuits. Use Value: Predictable +0.095 %/°C drift allows accurate compensation modeling across missile boost phase thermal transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4123UR-1 | Same electrical specs; DO-213AA surface-mount package instead of DO-35 axial | Requires PCB re-layout for SMT assembly; no through-hole mounting option | Select when automated assembly and board space constraints prioritize SMT over axial leads |
| 1N4123-1 (JANTXV) | Identical DO-35 package and 39.0 V rating; higher screening level (JANTXV vs. standard JAN) | Extended burn-in and parametric testing for mission-critical avionics where failure risk must be minimized | Select when system-level reliability requirements exceed standard JAN qualification |
Compared with 1N4123, the 1N4123UR-1 offers identical regulation performance in a compact surface-mount form factor, while the 1N4123-1 (JANTXV) adds enhanced screening for extended life in vibration-prone, high-availability platforms - both require explicit validation against the target application's thermal, mechanical, and radiation environment.
Availability
1N4123 is available at Aetrix Electronics and suitable for avionics power references, satellite voltage monitors, and nuclear instrumentation supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4123 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 1N4123 belongs to Microsemi's legacy MIL-qualified Zener diode family engineered specifically for radiation-hardened, high-temperature, and ultra-stable voltage reference applications in mission-critical systems.
FAQ
What is the Zener voltage tolerance for 1N4123?
The 1N4123 has a nominal Zener voltage of 39.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered electrical characteristics table. This tolerance applies at 250 mA test current and 25 °C ambient temperature. The 1N4123 does not offer tighter 2% or 1% tolerance variants - those are designated with suffixes 'C' or 'D' in other series members, but not applicable to 1N4123 itself.
Is 1N4123 suitable for surface-mount assembly?
No, the standard 1N4123 is supplied in the axial-leaded DO-35 (DO-204AH) package and is intended for through-hole mounting. For surface-mount compatibility, Microsemi offers the 1N4123UR-1 variant in DO-213AA package. The 1N4123UR-1 maintains identical electrical specifications including 39.0 V Zener voltage and 200 Ω dynamic impedance, but requires SMT reflow rather than wave soldering.
What is the maximum power dissipation of 1N4123 at 75 °C ambient?
At 75 °C ambient temperature, the 1N4123's rated average power dissipation is linearly derated from 500 mW at 25 °C to zero at 175 °C. Using the derating curve, power capability at 75 °C is 333 mW. This assumes standard mounting on FR4 with 4 mm² copper pads; actual dissipation must account for board layout and airflow in the final application.
Does 1N4123 meet RoHS compliance requirements?
Yes, RoHS-compliant versions of 1N4123 are available with the 'e3' suffix (e.g., 1N4123-1e3), but only for commercial-grade units. Mil-spec versions (JAN, JANTX, JANTXV, JANS) retain leaded terminations per MIL-STD-750 and are not RoHS compliant. The 1N4123-1e3 uses annealed matte-tin plating and meets exemption 7a for high-melting-temperature solders.
What is the noise performance of 1N4123 at its Zener test current?
The 1N4123 exhibits a maximum noise density of 1 µV/√Hz at 250 mA Zener test current and 25 °C, measured in the 1 kHz–3 kHz bandpass. This value falls rapidly below 6.8 V devices, and the 1N4123's 39.0 V rating places it in the low-noise tier of the series - critical for precision analog references where spectral purity affects ADC effective resolution.
1N4123 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:
- -
1N4123 FAQ
1.How can I place an order for 1N4123 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4123 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 reliable?
The price and inventory of 1N4123 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4123 is usually 5 days.
3.What payment methods are accepted for 1N4123?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4123 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4123?
1N4123 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4123 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?
For technical support, including 1N4123 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4123 requirements.
6.How does Aetrix verify that 1N4123 is sourced from the original manufacturer or authorized distributors?
All 1N4123 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 meets industry standards.
7.What is the process for return or replacement of 1N4123?
All 1N4123 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4123, 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 part is unused and in its original packaging.
Return procedure for 1N4123:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4123 Tags
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