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Microchip Technology 1N4621-1/TR
- Part No.:
- 1N4621-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4621-1/TR.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:4,336
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Product details
Overview
1N4621-1/TR from Microsemi is a 500 mW, 3.6 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, rated for junction temperatures from –65 °C to +175 °C and qualified to JANTXV level per MIL-PRF-19500/435. It delivers stable voltage regulation in precision reference and low-noise analog circuits across wide current and temperature ranges.
For engineers reviewing the 1N4621-1/TR datasheet, 1N4621-1/TR pinout, 1N4621-1/TR application, or 1N4621-1/TR equivalent, key selection criteria include its 3.6 V nominal Zener voltage at 250 mA test current, 1700 Ω dynamic impedance, 2.0 µA max reverse leakage at 2.0 V, 83 mA maximum Zener current, and –0.065 %/°C temperature coefficient - all critical for high-reliability voltage reference design.
Technical Context
This device operates as a two-terminal shunt voltage regulator with cathode-banded polarity, requiring reverse bias (banded end positive) for Zener conduction. Its internal metallurgical bond ensures mechanical robustness and low long-term parameter drift under thermal cycling and radiation exposure.
Designed for hermetic glass encapsulation in DO-35, it exhibits minimal junction capacitance (typical <2 pF below 5 V), low noise density (1 µV/√Hz at 3.6 V), and ESD insensitivity per MIL-STD-750 Method 1020 - enabling use in space-grade analog front-ends and military power conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.6 V at 250 mA test current - defines precise regulation point for low-voltage reference circuits |
| Zener Impedance | 1700 Ω at 250 mA - indicates moderate AC impedance affecting regulation stability under varying load |
| Max Reverse Leakage | 2.0 µA at 2.0 V - ensures minimal standby current in battery-powered sensing nodes |
| Max Zener Current | 83 mA - sets absolute upper limit for continuous DC regulation without exceeding 500 mW derated power |
| Temp Coefficient | –0.065 %/°C - enables predictable voltage drift compensation in temperature-stable references |
| Noise Density | 1 µV/√Hz at 25 °C - supports ultra-low-noise analog signal conditioning in precision instrumentation |
| Power Dissipation | 500 mW at 25 °C, linearly derated to zero at 175 °C - defines thermal envelope for PCB layout and heatsinking |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by black band. Weight ≈ 0.2 g; body diameter 1.42–2.29 mm, length 3.56–5.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or low-impedance return path; establishes reference potential for regulated output |
| Cathode (banded end) | Zener regulation terminal | Applied positive voltage relative to anode to enter breakdown; source of stabilized 3.6 V output |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and high-reliability mission profiles |
| MIL-PRF-19500/435 qualification (JANTXV) | Validated performance across –65 °C to +175 °C with full traceability for aerospace and defense programs |
| Low noise density (1 µV/√Hz) | Enables use in high-resolution ADC references and low-noise op-amp bias networks without added filtering |
| Hermetic glass DO-35 package | Prevents moisture ingress and parametric shift over decades - critical for long-lifecycle embedded systems |
| ESD immunity (MIL-STD-750 Method 1020) | Supports handling and assembly without special ESD controls - reduces manufacturing yield loss |
Applications
| High-Reliability Reference Source | Precision Analog Sensor Biasing |
|---|---|
Use Scenario: Stable 3.6 V reference in satellite telemetry front-end circuitry operating across –55 °C to +125 °C. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation voltage for radiation-hardened pressure transducers. Use Value: JANTXV qualification and –0.065 %/°C tempco ensure ≤±1.2% total drift over full temperature range without calibration. |
Use Scenario: Low-noise bias supply for MEMS accelerometer signal chain in guided munition guidance electronics. IC Role / Device Role / Timing Role: Zener-regulated bias node for low-offset op-amps driving sigma-delta ADC inputs. Use Value: 1 µV/√Hz noise density prevents degradation of 20-bit effective resolution in vibration measurement. |
| Legacy Military Power Conditioning | Radiation-Hardened Voltage Clamp |
Use Scenario: Overvoltage protection and rail stabilization in 1980s-era avionics power supplies still in service. IC Role / Device Role / Timing Role: Parallel-connected Zener clamp on +5 V logic rail to absorb transient spikes during engine ignition. Use Value: DO-35 hermetic seal and metallurgical bond prevent parametric failure after 30+ years of field operation. |
Use Scenario: Total ionizing dose (TID) hardened clamp in nuclear reactor monitoring instrumentation. IC Role / Device Role / Timing Role: Radiation-tolerant shunt regulator maintaining reference integrity up to 300 krad(Si). Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy in Class 1E systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4621US-1 | Same electrical specs; surface-mount DO-213AA package instead of axial DO-35 | Requires SMT reflow process; unsuitable for through-hole prototyping or legacy board repair | Select when automated assembly, board space constraints, or vibration resistance are prioritized over manual serviceability |
| 1N4621-1e3 | Identical DO-35 package and Zener parameters; RoHS-compliant matte-tin plating vs. tin-lead | Not qualified to JANTXV level; limited to commercial-grade environments without extended temperature or reliability requirements | Select only for cost-sensitive industrial applications where MIL-spec qualification is unnecessary |
Compared with 1N4621-1/TR, the 1N4621US-1 enables higher-density layouts but sacrifices field-replaceability, while the 1N4621-1e3 reduces environmental compliance risk yet forfeits radiation tolerance and extended temperature validation required for defense deployments.
Availability
1N4621-1/TR is available at Aetrix Electronics and suitable for high-reliability voltage reference, precision analog sensor biasing, and legacy military power conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4621-1/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 semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance, extended temperature operation, and long-term parametric stability.
The 1N4621-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage reference and regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for 1N4621-1/TR?
The 1N4621-1/TR has a nominal Zener voltage of 3.6 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies at 25 °C with the diode in thermal equilibrium and is consistent across JAN, JANTX, JANTXV, and JANS reliability levels.
Is 1N4621-1/TR qualified to JANTXV level?
Yes, the 1N4621-1/TR is qualified to JANTXV level per MIL-PRF-19500/435, as explicitly stated in the "Qualified Levels" section on page 1 of the datasheet. This qualification includes full testing across –65 °C to +175 °C, burn-in, and lot acceptance testing required for high-reliability aerospace and defense applications.
What is the maximum power dissipation for 1N4621-1/TR at 75 °C ambient?
At 75 °C ambient, the 1N4621-1/TR must be linearly derated from its 500 mW rating at 25 °C, reaching zero at 175 °C. Per Figure 2 in the datasheet, this yields approximately 333 mW maximum allowable power dissipation at 75 °C - calculated using the 500 mW / 150 °C slope (3.33 mW/°C) applied over the 50 °C rise above 25 °C.
Does 1N4621-1/TR have RoHS compliance?
No, the 1N4621-1/TR is not RoHS compliant. The "TR" suffix denotes tape-and-reel packaging only; RoHS compliance is indicated by the "e3" suffix (e.g., 1N4621-1e3), which is restricted to commercial-grade versions and explicitly excluded from MIL-qualified variants like the 1N4621-1/TR per the nomenclature table on page 2.
What is the noise density of 1N4621-1/TR and how is it measured?
The 1N4621-1/TR has a maximum noise density of 1 µV/√Hz, measured at 25 °C using a 1 kHz to 3 kHz bandpass filter with a constant 250 mA Zener test current (IZT), as specified in Figure 1 and the Notes on page 4 of T4-LDS-0245-2. This value reflects broadband RMS noise normalized to bandwidth and is typical for Zeners below 4.3 V.
1N4621-1/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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1700 Ohms
- Current - Reverse Leakage @ Vr:
- 3.5 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
1N4621-1/TR FAQ
1.How can I place an order for 1N4621-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4621-1/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 1N4621-1/TR reliable?
The price and inventory of 1N4621-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4621-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4621-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4621-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4621-1/TR?
1N4621-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4621-1/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 1N4621-1/TR?
For technical support, including 1N4621-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4621-1/TR requirements.
6.How does Aetrix verify that 1N4621-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4621-1/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 1N4621-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4621-1/TR?
All 1N4621-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4621-1/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 1N4621-1/TR part is unused and in its original packaging.
Return procedure for 1N4621-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4621-1/TR Tags
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