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Microchip Technology 1N4621-1
- Part No.:
- 1N4621-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4621-1.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:2,443
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Product details
Overview
1N4621-1 from Microsemi is a 500 mW, 3.6 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 1700 Ω dynamic impedance at 250 mA test current, and -0.065 %/°C temperature coefficient - used for precision voltage reference and regulation in military-grade power supplies.
For engineers reviewing the 1N4621-1 datasheet, 1N4621-1 pinout, 1N4621-1 application, or 1N4621-1 equivalent, key selection criteria include Zener voltage stability across temperature, low noise density (1 µV/√Hz), hermetic glass packaging, MIL-qualified reliability levels, and axial-leaded mechanical mounting compatibility.
Technical Context
This device operates as a reverse-biased voltage regulator with metallurgically bonded junction, enabling stable breakdown behavior under wide current (250 mA IZT) and thermal (-65 °C to +175 °C) ranges. Its 1700 Ω dynamic impedance at 250 mA and -0.065 %/°C temperature coefficient support tight regulation in analog reference circuits.
Noise performance is specified at 1 µV/√Hz (typical), verified at 1 kHz–3 kHz bandwidth with 250 mA DC bias, and capacitance remains minimal (<10 pF) across its 3.6 V Zener voltage - critical for low-noise bandgap references and sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.6 V at 250 mA - defines precise regulation point for low-voltage reference design |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact, unheatsinked layouts |
| Dynamic Impedance ZZT | 1700 Ω at 250 mA - indicates moderate regulation stiffness; suitable for non-critical analog references |
| Temp. Coefficient αVZ | -0.065 %/°C - enables predictable drift compensation in temperature-stable references |
| Noise Density ND | 1 µV/√Hz - ensures minimal added noise in precision instrumentation front-ends |
| Reverse Leakage IR | 2.0 µA at 2.0 V - confirms low off-state current for battery-powered standby circuits |
| Junction Temp. Range | -65 °C to +175 °C - validated for aerospace, downhole, and high-reliability embedded systems |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, cathode indicated by band, tin-lead or RoHS-compliant matte-tin plating, ~0.2 g weight, 1.0–1.5 inch lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode (banded end) | Zener regulation terminal / reverse-bias input | Applied positive voltage relative to anode to activate breakdown regulation at 3.6 V |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables repeatable, low-hysteresis Zener breakdown essential for calibration-grade references |
| MIL-PRF-19500/435 qualification (JANTXV) | Guarantees screening, testing, and traceability for defense/aerospace deployment |
| 1 µV/√Hz noise density | Supports ultra-low-noise voltage references in precision ADC drivers and sensor signal chains |
| Hermetic glass DO-35 package | Provides long-term moisture and contamination immunity without conformal coating |
| Non-ESD-sensitive per MIL-STD-750 Method 1020 | Eliminates need for ESD handling protocols during manual assembly or rework |
Applications
| Aerospace Power Reference | Military Sensor Excitation |
|---|---|
Use Scenario: Providing stable 3.6 V reference for analog-to-digital conversion in satellite telemetry modules operating across -55 °C to +125 °C. IC Role / Device Role / Timing Role: Zener diode acting as primary shunt voltage reference for precision op-amp biasing and ADC reference divider networks. Use Value: JANTXV qualification and -65 °C to +175 °C junction rating ensure uninterrupted operation during orbital thermal cycling. | Use Scenario: Supplying regulated excitation voltage to strain-gauge bridges in armored vehicle inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Low-noise shunt regulator establishing clean 3.6 V bias for bridge completion and amplifier input staging. Use Value: 1 µV/√Hz noise density prevents signal corruption in microvolt-level bridge output measurements. |
| Downhole Instrumentation Reference | Avionics Voltage Clamp |
Use Scenario: Serving as temperature-stable voltage clamp in high-temperature logging tools deployed at 175 °C wellbore environments. IC Role / Device Role / Timing Role: Zener diode functioning as overvoltage protector and reference node stabilizer in mixed-signal ASIC power domains. Use Value: Hermetic DO-35 glass package and +175 °C max junction temperature prevent parametric shift or seal failure under extreme thermal stress. | Use Scenario: Clamping transient spikes on 5 V logic rails in flight control computers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt limiter absorbing short-duration overvoltage events while maintaining system logic integrity. Use Value: Metallurgical bond structure ensures consistent clamping voltage and no degradation after repeated surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4621UR-1 | Same electrical specs, but in DO-213AA surface-mount package instead of DO-35 axial | Requires PCB re-layout for SMT assembly; eliminates through-hole mounting and lead-forming steps | Select when automated SMT production, space-constrained boards, or reduced board thickness are required |
| 1N4621-1e3 | Identical DO-35 package and electrical parameters, but RoHS-compliant matte-tin plating (commercial grade only) | Not qualified to JANTXV; limited to commercial-temperature range (-65 °C to +150 °C) and non-military use | Select for cost-sensitive industrial designs where MIL-spec screening and extended temperature are not mandatory |
Compared with 1N4621UR-1 and 1N4621-1e3, the 1N4621-1 delivers full JANTXV reliability screening, hermetic axial-leaded packaging, and guaranteed operation up to +175 °C - making it the sole choice for mission-critical, high-temperature, or through-hole-assembled military systems.
Availability
1N4621-1 is available at Aetrix Electronics and suitable for aerospace power reference, military sensor excitation, and downhole instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N4621-1 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, radiation-hardened, and mil-spec analog and discrete components.
The 1N4621-1 belongs to Microsemi's legacy 1N46xx-1 Zener diode family, engineered specifically for high-stability voltage regulation in defense, aerospace, and industrial systems demanding MIL-PRF-19500 qualification and hermetic reliability.
FAQ
What is the Zener voltage and tolerance of the 1N4621-1?
The 1N4621-1 has a nominal Zener voltage of 3.6 V at 250 mA test current, with a standard tolerance of ±5% per JEDEC registration. This value is measured under thermal equilibrium at 25 °C ambient and reflects the device's primary regulation point in reverse-bias operation.
Is the 1N4621-1 qualified to military specifications?
Yes, the 1N4621-1 is qualified per MIL-PRF-19500/435 at JANTXV reliability level, including rigorous screening for vibration, thermal shock, burn-in, and hermeticity - confirming its suitability for high-integrity defense and aerospace applications.
What is the maximum power dissipation and derating behavior of the 1N4621-1?
The 1N4621-1 has a rated average power dissipation of 500 mW at 25 °C. It linearly derates to zero at 175 °C junction temperature, with full power maintained up to 50 °C lead temperature - a critical consideration for thermal design in enclosed or high-ambient environments.
Does the 1N4621-1 have low-noise characteristics suitable for precision references?
Yes, the 1N4621-1 exhibits a typical noise density of 1 µV/√Hz at 1 kHz–3 kHz bandwidth and 250 mA bias, verified per Microsemi MicroNote 202 - making it appropriate for low-noise analog references where added voltage noise must be minimized.
What package type and marking does the 1N4621-1 use?
The 1N4621-1 uses the DO-35 (DO-204AH) axial-leaded hermetic glass package with cathode identified by a visible band; it is marked with the full part number "1N4621-1" and features tin-lead plating compliant with MIL-STD-750 Method 2026.
1N4621-1 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):
- 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 FAQ
1.How can I place an order for 1N4621-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4621-1 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 1N4621-1 reliable?
The price and inventory of 1N4621-1 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 is usually 5 days.
3.What payment methods are accepted for 1N4621-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4621-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4621-1?
1N4621-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4621-1 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 1N4621-1?
For technical support, including 1N4621-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4621-1 requirements.
6.How does Aetrix verify that 1N4621-1 is sourced from the original manufacturer or authorized distributors?
All 1N4621-1 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 1N4621-1 meets industry standards.
7.What is the process for return or replacement of 1N4621-1?
All 1N4621-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4621-1, 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 1N4621-1 part is unused and in its original packaging.
Return procedure for 1N4621-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4621-1 Tags
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