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Microchip Technology 1N4623-1/TR
- Part No.:
- 1N4623-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4623-1/TR.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:2,966
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Product details
Overview
1N4623-1/TR from Microsemi is a 500 mW, 4.3 V Zener diode in DO-35 glass package with 1% voltage tolerance, 1600 Ω dynamic impedance at 250 mA test current, and -0.050 %/°C temperature coefficient - used for precision voltage reference and regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4623-1/TR datasheet, 1N4623-1/TR pinout, 1N4623-1/TR application, or 1N4623-1/TR equivalent, this page delivers verified MIL-PRF-19500/435 qualified parameters, JANS-level reliability data, noise density (1 µV/√Hz), thermal resistance (250 °C/W junction-to-lead), and DO-35 mechanical dimensions per T4-LDS-0245-2 Rev. 1.
Technical Context
This device operates as a reverse-biased voltage regulator with metallurgically bonded construction ensuring stable breakdown characteristics across -65 to +175 °C. Its 4.3 V nominal Zener voltage is specified at 250 mA test current (IZT), with 2.0 µA maximum reverse leakage at 3.6 V (VR).
The diode exhibits low noise density (1 µV/√Hz) and minimal capacitance (typical <2 pF), making it suitable for low-noise analog references. Its 1600 Ω dynamic impedance (ZZT) and -0.050 %/°C temperature coefficient support stable regulation under varying load and thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.3 V ±1% at 250 mA - ensures tight regulation tolerance for precision reference designs |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact axial-leaded layouts |
| Dynamic Impedance ZZT | 1600 Ω at 250 mA - defines regulation stiffness against load current variation |
| Noise Density ND | 1 µV/√Hz - enables use in low-noise analog signal chains and sensor excitation |
| Temp Coefficient αVZ | -0.050 %/°C - provides predictable drift behavior over wide temperature ranges |
| Junction Temp Range | -65 to +175 °C - meets extended environmental requirements for military avionics |
| Thermal Resistance RθJL | 250 °C/W @ 3/8″ lead length - informs heatsinking and PCB trace design for thermal management |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; supplies regulated 4.3 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and reduced parameter drift under thermal cycling |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANS level for space-grade and high-reliability defense systems |
| Low noise density | 1 µV/√Hz enables use in precision analog front-ends without added filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift in humid or corrosive environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection |
Applications
| Aerospace Power Reference | Defense System Voltage Monitor |
|---|---|
Use Scenario: Providing stable 4.3 V reference for ADC biasing and op-amp feedback networks in satellite power management units. IC Role / Device Role / Timing Role: Precision Zener reference diode establishing absolute voltage基准 for analog signal conditioning. Use Value: -0.050 %/°C tempco and 1% tolerance ensure <±0.5% total error over -55 to +125 °C operating range. | Use Scenario: Monitoring rail integrity in radar transceiver power supplies where fault detection must operate across extreme temperature swings. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling accurate undervoltage/overvoltage trip thresholds. Use Value: JANS qualification and -65 to +175 °C junction rating guarantee operation in missile launch environments. |
| Avionics Sensor Excitation | High-Reliability Industrial PLC Input |
Use Scenario: Supplying excitation voltage to strain gauge bridges in flight control surface position sensors. IC Role / Device Role / Timing Role: Low-noise (1 µV/√Hz) Zener source minimizing measurement uncertainty in bridge offset calibration. Use Value: Minimal capacitance (<2 pF) prevents phase shift in high-frequency bridge AC excitation signals. | Use Scenario: Regulating input reference voltage for isolated analog input modules in nuclear plant control systems. IC Role / Device Role / Timing Role: Hermetically sealed voltage regulator maintaining accuracy despite gamma radiation exposure. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in Class 1E applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4623US-1 | Same electrical specs, but in DO-213AA surface-mount package instead of DO-35 axial lead | Requires SMT reflow process; unsuitable for through-hole prototyping or high-vibration mechanical mounting | Select when board space is constrained and automated assembly is used |
| 1N4623-1e3 | Identical DO-35 package and electrical specs, but RoHS-compliant matte-tin plating vs. tin-lead | Not qualified to JANTXV/JANS levels; limited to commercial-grade environmental screening | Select for RoHS-compliant commercial programs where MIL-spec is not required |
Compared with 1N4623US-1 and 1N4623-1e3, the 1N4623-1/TR offers full MIL-PRF-19500/435 qualification including JANS, axial-leaded mechanical robustness, and tin-lead solder compatibility - critical for legacy aerospace production and repair.
Availability
1N4623-1/TR is available at Aetrix Electronics and suitable for aerospace power reference, defense system voltage monitoring, and avionics sensor excitation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4623-1/TR 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 1N4623-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for precision voltage regulation in mission-critical systems where parameter stability and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4623-1/TR?
The 1N4623-1/TR has a nominal Zener voltage of 4.3 V with ±1% tolerance, as indicated by the "D" suffix in its nomenclature per Microsemi's part numbering convention. This tolerance is guaranteed at 25 °C with 250 mA test current (IZT) and applies across the full operating temperature range when combined with its -0.050 %/°C temperature coefficient.
Is 1N4623-1/TR qualified to JANS level?
Yes, the 1N4623-1/TR is qualified per MIL-PRF-19500/435 up to JANS level, confirming its suitability for spaceflight and nuclear-hardened applications. This qualification includes rigorous testing for parameter stability, hermeticity, radiation tolerance, and thermal cycling - all documented in Microsemi's T4-LDS-0245-2 specification sheet.
What does the "TR" suffix mean in 1N4623-1/TR?
The "TR" suffix in 1N4623-1/TR indicates tape-and-reel packaging per EIA-296 standard, intended for automated pick-and-place assembly. It does not affect electrical or reliability specifications - the device remains identical to the bulk version in all performance and qualification aspects.
What is the maximum reverse leakage current for 1N4623-1/TR?
The maximum reverse leakage current (IR) for 1N4623-1/TR is 2.0 µA at 3.6 V reverse voltage (VR), measured at 25 °C. This value reflects the device's tight regulation knee and low off-state power loss, supporting efficient operation in low-quiescent-current reference designs.
Can 1N4623-1/TR be used in surface-mount designs?
No - the 1N4623-1/TR uses the axial-leaded DO-35 (DO-204AH) package and is not compatible with surface-mount assembly. For SMT equivalents, consider the 1N4623US-1 in DO-213AA package, which shares identical electrical specifications but requires reflow soldering and lacks JANS qualification.
1N4623-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N4623-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4623-1/TR 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/TR reliable?
The price and inventory of 1N4623-1/TR 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/TR is usually 5 days.
3.What payment methods are accepted for 1N4623-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4623-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4623-1/TR?
1N4623-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4623-1/TR 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/TR?
For technical support, including 1N4623-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4623-1/TR requirements.
6.How does Aetrix verify that 1N4623-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4623-1/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N4623-1/TR?
All 1N4623-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4623-1/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N4623-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4623-1/TR Tags
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