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Microchip Technology 1N4623-1
- Part No.:
- 1N4623-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4623-1.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:8,357
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Product details
Overview
1N4623-1 from Microsemi is a 500 mW, 4.3 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435, with 1% voltage tolerance, 1600 Ω dynamic impedance at 250 mA, and -0.050 %/°C temperature coefficient - used for precision voltage reference in military power supplies and analog sensor conditioning circuits.
For engineers reviewing the 1N4623-1 datasheet, 1N4623-1 pinout, 1N4623-1 application, or 1N4623-1 equivalent, this page delivers verified Zener parameters, mil-spec qualification status, thermal derating behavior, noise density (1 µV/√Hz), and direct alternatives for high-reliability analog regulation design.
Technical Context
The 1N4623-1 operates as a reverse-biased voltage regulator with metallurgically bonded construction ensuring stable breakdown characteristics across -65 °C to +175 °C. Its 4.3 V nominal Zener voltage is specified at 250 mA test current (IZT), with dynamic impedance of 1600 Ω measured using 10% rms ac modulation at 60 Hz.
It exhibits low noise density (1 µV/√Hz) and minimal capacitance (typical <2 pF), making it suitable for low-noise reference applications. Temperature coefficient is tightly controlled at -0.050 %/°C, enabling predictable drift compensation in precision analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.3 V ±1% at 250 mA - ensures tight regulation tolerance for reference stability in critical analog stages. |
| Power Dissipation | 500 mW at 25 °C, linearly derated to zero at 175 °C - defines maximum safe continuous power under thermal equilibrium. |
| Dynamic Impedance ZZT | 1600 Ω at IZT = 250 mA - indicates regulation stiffness; lower values improve load regulation but 1600 Ω is typical for sub-5 V Zeners. |
| Noise Density ND | 1 µV/√Hz - enables use in low-noise instrumentation references where broadband noise must be minimized. |
| Temp Coefficient αVZ | -0.050 %/°C - allows accurate prediction of voltage drift over temperature in compensated designs. |
| Reverse Leakage IR | 2.0 µA max at VR = 2.0 V - confirms low off-state current, critical for battery-powered or high-impedance bias networks. |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extended-environment aerospace, defense, and downhole electronics. |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package. Cathode indicated by band; operated with banded end positive relative to anode for Zener regulation. Approximate weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lowest potential node; reverse voltage applied between cathode and anode. |
| Cathode | Zener regulation output / voltage reference node | Banded end; supplies regulated 4.3 V when reverse biased; serves as stable reference point for feedback or biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and resistance to thermal cycling-induced degradation in harsh environments. |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTXV level - required for flight-critical and mission-essential defense electronics. |
| Low noise density | 1 µV/√Hz at 4.3 V enables use in precision ADC references and low-drift op-amp bias networks. |
| Hermetic glass sealing | Prevents moisture ingress and parametric shift over time - essential for >20-year shelf life in stored systems. |
| 1% voltage tolerance option | Reduces need for external trimming in production calibration; improves yield in high-accuracy analog modules. |
Applications
| Aerospace Power Reference | Military Sensor Signal Conditioning |
|---|---|
Use Scenario: Stable 4.3 V reference for ADC front-end in satellite telemetry power management unit operating across -55 °C to +125 °C. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for 16-bit SAR ADC and LDO feedback divider. Use Value: JANTXV qualification and -0.050 %/°C tempco ensure <±0.5% reference error over full temperature range without active compensation. | Use Scenario: Biasing network for piezoresistive pressure transducer in armored vehicle health monitoring system. IC Role / Device Role / Timing Role: Precision shunt regulator establishing excitation voltage for Wheatstone bridge and offset nulling. Use Value: 1 µV/√Hz noise density prevents signal-to-noise degradation in microvolt-level bridge outputs. |
| Downhole Instrumentation Reference | Tactical Radio RF Stage Biasing |
Use Scenario: Voltage reference in high-temperature logging tool exposed to 175 °C wellbore ambient during oil/gas exploration. IC Role / Device Role / Timing Role: Primary Zener reference for DAC-controlled current source driving resistivity sensors. Use Value: 175 °C max junction temperature and hermetic DO-35 package enable uninterrupted operation without derating penalties. | Use Scenario: Regulated bias supply for GaAs FET driver stage in manpack HF transceiver operating under shock/vibe conditions. IC Role / Device Role / Timing Role: Shunt regulator stabilizing gate bias voltage against supply ripple and temperature variation. Use Value: Metallurgical bond and MIL-qualified construction prevent parameter shift during mechanical stress and 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 |
|---|---|---|---|
| 1N4623UR-1 | Same electrical specs, DO-213AA surface-mount package instead of DO-35 axial lead. | Required for automated SMT assembly; lacks axial mounting flexibility and manual prototyping ease. | Select when board space constraints or reflow-only manufacturing mandate SMT packaging. |
| 1N4623-1 (JANS) | Identical electrical and thermal specs, but qualified to JANS (space-level) per MIL-PRF-19500/435. | Required for radiation-tolerant or ultra-high-reliability spaceflight avionics; higher screening cost and longer lead time. | Select only when mission-critical radiation hardness and 100% lot testing are mandated by program requirements. |
Compared with 1N4623UR-1 and 1N4623-1 (JANS), the standard 1N4623-1 offers optimal balance of mil-spec reliability, axial-lead serviceability, and cost for terrestrial defense and industrial applications requiring 4.3 V ±1% regulation.
Availability
1N4623-1 is available at Aetrix Electronics and suitable for aerospace power references, military sensor signal conditioning, and downhole instrumentation requiring stable component supply with guaranteed traceability and long-term obsolescence management.
Supply support for 1N4623-1 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) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N4623-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for precision voltage regulation in mission-critical analog subsystems where parameter stability, low noise, and environmental ruggedness are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4623-1?
The 1N4623-1 has a nominal Zener voltage of 4.3 V with ±1% tolerance, as indicated by the "D" suffix in its full nomenclature per MIL-PRF-19500/435. This tighter tolerance eliminates need for post-calibration trimming in high-accuracy analog designs and is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1.
Is 1N4623-1 qualified to JANTXV level?
Yes, the 1N4623-1 is qualified to JANTXV level per MIL-PRF-19500/435, as stated in the DESCRIPTION section on page 1 of the datasheet. This qualification includes rigorous screening for temperature cycling, burn-in, and parameter verification - confirming suitability for high-reliability defense electronics where failure is not acceptable.
What is the maximum reverse leakage current for 1N4623-1?
The maximum reverse leakage current (IR) for 1N4623-1 is 2.0 µA at VR = 2.0 V, as specified in the Electrical Characteristics table on page 3. This low leakage supports use in high-impedance bias networks and battery-operated systems where standby current must be minimized without compromising regulation accuracy.
Does 1N4623-1 have low noise performance?
Yes, the 1N4623-1 delivers 1 µV/√Hz noise density at its 4.3 V Zener voltage and 250 mA test current, as documented in the Electrical Characteristics table. This value is among the lowest in the 1N46xx series and makes the 1N4623-1 especially suitable for precision reference applications such as ADC voltage references and low-drift op-amp biasing.
What package type does 1N4623-1 use?
The 1N4623-1 uses the DO-35 (DO-204AH) axial-leaded, hermetically sealed glass package, as confirmed in the MECHANICAL and PACKAGING section on page 2. The cathode is marked by a band, and the device is intended for through-hole mounting with 3/8-inch lead length for thermal management per RθJL = 250 °C/W specification.
1N4623-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1600 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N4623-1 FAQ
1.How can I place an order for 1N4623-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4623-1 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 1N4623-1 reliable?
The price and inventory of 1N4623-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4623-1 is usually 5 days.
3.What payment methods are accepted for 1N4623-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4623-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4623-1?
1N4623-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4623-1 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 1N4623-1?
For technical support, including 1N4623-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4623-1 requirements.
6.How does Aetrix verify that 1N4623-1 is sourced from the original manufacturer or authorized distributors?
All 1N4623-1 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 1N4623-1 meets industry standards.
7.What is the process for return or replacement of 1N4623-1?
All 1N4623-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4623-1, 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 1N4623-1 part is unused and in its original packaging.
Return procedure for 1N4623-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4623-1 Tags
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