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Microchip Technology 1N4620-1/TR
- Part No.:
- 1N4620-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4620-1/TR.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:7,150
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Product details
Overview
1N4620-1/TR from Microsemi is a 500 mW, 3.3 V Zener diode in DO-35 glass package with 5% voltage tolerance, metallurgical bonding, and MIL-PRF-19500/435 qualification up to JANS level for high-reliability voltage regulation in aerospace and defense power supplies.
For engineers reviewing the 1N4620-1/TR datasheet, 1N4620-1/TR pinout, 1N4620-1/TR application, or 1N4620-1/TR equivalent, this page delivers verified Zener voltage (3.3 V), test current (250 mA), dynamic impedance (1650 Ω), noise density (1 µV/√Hz), and thermal resistance (250 °C/W) - all critical for precision reference and low-noise bias design.
Technical Context
This Zener diode operates in reverse breakdown with cathode band indicating polarity, requiring banded end positive relative to anode for regulation. It features metallurgically bonded construction enabling stable performance across -65 °C to +175 °C junction temperature range and low capacitance per Figure 3.
Its 3.3 V nominal Zener voltage is specified at 250 mA test current (IZT), with maximum dynamic impedance of 1650 Ω at that point and reverse leakage limited to 3.5 µA at 1.5 V (VR). Noise density is rated at 1 µV/√Hz - among the lowest in the 1N46xx-1 series for sub-5 V devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.3 V at 250 mA - sets precise DC reference level for analog circuits and voltage clamping. |
| Power Dissipation | 500 mW at 25 °C - supports stable regulation under moderate load without forced cooling. |
| Zener Impedance ZZT | 1650 Ω max at IZT - indicates voltage stability under varying current; lower than 1N4619-1 (1600 Ω) but higher than 1N4621-1 (1700 Ω). |
| Reverse Leakage IR | 3.5 µA at VR = 1.5 V - ensures minimal quiescent current in standby bias networks. |
| Noise Density ND | 1 µV/√Hz - enables use in low-noise references where 1N4625-1 (2 µV/√Hz) or higher-voltage parts exhibit more noise. |
| Temp Coefficient αVZ | -0.075 %/°C - provides predictable, negative drift for temperature-compensated designs. |
| Junction Temp Range | -65 °C to +175 °C - qualified for extended-range military and space-grade operation. |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with hermetically sealed construction, tin-lead or RoHS-compliant matte-tin plating, and cathode indicated by a single band. Weight ≈ 0.2 g; lead length 1.0–1.5 inches (25.4–38.1 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; must be at lower potential than cathode during regulation. |
| Cathode (banded end) | Zener output terminal | Provides regulated 3.3 V when reverse-biased; polarity critical for correct operation. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables high reliability and long-term stability under thermal cycling and radiation exposure per MicroNote 050. |
| MIL-PRF-19500/435 qualification | Validated to JANS level - suitable for flight-critical avionics and satellite power subsystems. |
| Low noise density (1 µV/√Hz) | Supports ultra-low-noise voltage references in precision instrumentation front-ends and sensor biasing. |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over decades - essential for mission-critical long-life systems. |
| ESD immunity (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection in handling and assembly of high-value assemblies. |
Applications
| Avionics Power Reference | Satellite Bus Voltage Clamp |
|---|---|
Use Scenario: Providing stable 3.3 V reference for ADCs and DACs in inertial measurement units (IMUs) operating across -55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Zener diode acting as primary shunt voltage reference in unregulated DC-DC converter feedback paths. Use Value: -0.075 %/°C tempco and 1 µV/√Hz noise ensure <±0.5% reference accuracy and <1 LSB noise floor in 16-bit data acquisition. | Use Scenario: Clamping 3.3 V rail against transients on LEO satellite payload bus during solar array switching events. IC Role / Device Role / Timing Role: Shunt regulator protecting downstream FPGAs and memory from overvoltage spikes exceeding 4 V. Use Value: 500 mW rating and 1650 Ω dynamic impedance limit clamp voltage excursion to ≤3.5 V for <100 ns duration per MIL-STD-461E CS115. |
| Rad-Hard Sensor Bias | Tactical Radio RF Stage Bias |
Use Scenario: Supplying low-noise bias to radiation-hardened photodiode amplifiers in nuclear monitoring equipment. IC Role / Device Role / Timing Role: Low-capacitance Zener providing stable 3.3 V bias while minimizing signal coupling into high-impedance sensor nodes. Use Value: Minimal capacitance (≈2 pF per Figure 3) and inherent radiation hardness prevent gain drift or latch-up under 100 krad(Si) total ionizing dose. | Use Scenario: Establishing fixed gate bias for GaN HEMTs in S-band tactical radio PA stages exposed to wide temperature swings. IC Role / Device Role / Timing Role: Temperature-stable shunt reference compensating for GaN threshold voltage drift across -40 °C to +85 °C. Use Value: Negative tempco (-0.075 %/°C) counterbalances GaN's positive Vth drift, reducing PA gain variation to <0.3 dB over full range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4620US-1TR | Same electrical specs, but in surface-mount DO-213AA package - no axial leads. | Requires PCB rework for SMT assembly; eliminates through-hole mounting and lead trimming. | Select when board space is constrained and automated placement is required. |
| 1N4728A | 3.3 V, 1 W rating, 5% tolerance, DO-41 package - higher power, larger footprint, commercial grade only. | Lacks MIL-qualification and radiation hardness; unsuitable for aerospace or high-reliability use. | Select only for cost-sensitive industrial controls where JANS compliance is unnecessary. |
Compared with 1N4620-1/TR, the 1N4620US-1TR offers identical regulation performance in SMT form, while the 1N4728A trades military reliability for higher power and lower cost - making the 1N4620-1/TR the sole choice for mil-spec 3.3 V Zener needs.
Availability
1N4620-1/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite bus voltage clamp, and rad-hard sensor bias applications requiring stable component supply, traceable lot history, and long-term obsolescence management.
Supply support for 1N4620-1/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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The 1N46xx-1 series was designed specifically for military and space applications demanding MIL-PRF-19500/435 qualification, hermetic sealing, and stable Zener performance across extreme temperatures.
FAQ
What is the Zener voltage tolerance for 1N4620-1/TR?
The 1N4620-1/TR has a nominal Zener voltage of 3.3 V with ±5% tolerance, consistent with the standard JEDEC specification for the 1N46xx-1 series. This tolerance applies at 25 °C with the diode in thermal equilibrium and is confirmed in Table on Page 3 of T4-LDS-0245-2 Rev. 1.
Is 1N4620-1/TR qualified to JANS level?
Yes, the 1N4620-1/TR is qualified per MIL-PRF-19500/435 up to JANS level, as stated in the "Qualified Levels" section on Page 1. This makes it suitable for spaceflight and nuclear-hardened systems where highest reliability and radiation tolerance are mandated.
What is the maximum Zener test current (IZT) for 1N4620-1/TR?
The maximum Zener test current IZT for 1N4620-1/TR is 250 mA, as specified in the Electrical Characteristics table on Page 3. This current defines the operating point at which VZ = 3.3 V and ZZT = 1650 Ω are measured under standard test conditions.
Does 1N4620-1/TR have RoHS compliance?
Yes, the "e3" suffix in the full part number (1N4620-1/TR is RoHS-compliant per the nomenclature table on Page 2), but only for commercial-grade versions. JANTX/JANS variants remain non-RoHS due to tin-lead plating requirements for solderability and reliability in harsh environments.
What is the thermal resistance junction-to-lead (RθJL) for 1N4620-1/TR?
The thermal resistance junction-to-lead (RθJL) for 1N4620-1/TR is 250 °C/W, measured with 3/8 inch (10 mm) lead length from body, as listed in the Maximum Ratings table on Page 1. This value supports thermal design for lead-mounted dissipation in conduction-cooled assemblies.
1N4620-1/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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1650 Ohms
- Current - Reverse Leakage @ Vr:
- 3.5 µA @ 1.5 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
1N4620-1/TR FAQ
1.How can I place an order for 1N4620-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4620-1/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 1N4620-1/TR reliable?
The price and inventory of 1N4620-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4620-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4620-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4620-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4620-1/TR?
1N4620-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4620-1/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 1N4620-1/TR?
For technical support, including 1N4620-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4620-1/TR requirements.
6.How does Aetrix verify that 1N4620-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4620-1/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 1N4620-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4620-1/TR?
All 1N4620-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4620-1/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 1N4620-1/TR part is unused and in its original packaging.
Return procedure for 1N4620-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4620-1/TR Tags
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