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Microchip Technology 1N3993E3
- Part No.:
- 1N3993E3
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N3993E3.pdf
- Description:
- DIODE ZENER 3.9V 10W DO4
- Quantity:
- Payment:
- Shipping:
Inventory:6,194
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Product details
Overview
1N3993E3 from Microsemi is a 10 W, 3.9 V ±5% hermetically sealed Zener diode in DO-213AA (DO-4) metal-glass package with cathode-to-stud polarity, rated for junction temperatures from –65 °C to +175 °C and used in precision voltage regulation for military-grade power supplies and radiation-hardened systems.
For engineers reviewing the 1N3993E3 datasheet, 1N3993E3 pinout, 1N3993E3 application, or 1N3993E3 equivalent, this part delivers stable 3.9 V regulation at 640 mA test current with 2.0 Ω dynamic impedance, low temperature coefficient (–0.060 %/°C), and MIL-PRF-19500/124 JANTXV qualification - critical for high-reliability analog reference and overvoltage protection circuits.
Technical Context
The 1N3993E3 operates as a precision shunt regulator in the reverse breakdown region, with Zener voltage specified at IZT = 640 mA and dynamic impedance ZZT = 2.0 Ω measured at 10% AC modulation superimposed on IZT. Its thermal resistance RθJC = 12 °C/W enables effective heat transfer to a metal chassis mount.
Designed for stud-mounting with 10–32 UNF–2A threads, it features welded hermetic sealing, tin-lead or RoHS-compliant matte-tin plating, and inherent radiation hardness per Microsemi MicroNote 050 - making it suitable for aerospace and defense systems where ESD immunity (MIL-STD-750 Method 1020) and long-term parameter stability are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% at IZT = 640 mA - defines precise regulation point for low-voltage reference circuits. |
| Power Dissipation (PD) | 10 W @ TC = +55 °C - supports high-current regulation without external heatsinking when mounted to chassis. |
| Dynamic Impedance (ZZT) | 2.0 Ω @ IZT - ensures minimal output voltage variation under load transients in feedback loops. |
| Temp. Coefficient (αVZ) | –0.060 %/°C - enables predictable drift compensation in wide-temperature-range instrumentation. |
| Junction Temp. Range | –65 °C to +175 °C - allows operation in extreme environments including engine bays and space electronics. |
| Reverse Leakage (IR) | 100 µA @ VR = 0.5 V - guarantees low standby current in battery-backed or low-power monitoring circuits. |
| Thermal Resistance | RθJC = 12 °C/W - permits accurate thermal modeling when bolted to aluminum or copper mounting surfaces. |
Pinout & Package
Package: DO-213AA (DO-4), hermetically sealed metal-glass stud-mount case with 10–32 UNF–2A threaded stud (cathode-connected), weight ≈ 7.5 g. Mounting requires chassis contact for thermal and electrical return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Body) | Cathode | Primary current-carrying terminal and thermal interface; must be electrically connected to system ground or return rail. |
| Lead Wire | Anode | Signal input terminal; connects to unregulated supply or voltage node requiring clamping/regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic metal-glass seal | Prevents moisture ingress and parameter drift over decades in humid or vacuum environments. |
| JANTXV qualification | Meets MIL-PRF-19500/124 screening for vibration, shock, temperature cycling, and burn-in - required for flight hardware. |
| RoHS-compliant e3 suffix | Matte-tin plating replaces tin-lead on commercial-grade units, enabling compliance without sacrificing solderability. |
| Low Zener impedance | 2.0 Ω at 640 mA enables tight regulation in high-precision analog references and feedback networks. |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - validated for space-grade use. |
Applications
| Avionics Power Regulation | Military Radar Bias Supply |
|---|---|
Use Scenario: Regulating +3.9 V reference for ADC front-end and FPGA configuration circuitry in airborne mission computers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for precision sensors and analog signal chains. Use Value: ±5% tolerance and –0.060 %/°C tempco ensure <±10 mV drift across –55 °C to +125 °C operating range. |
Use Scenario: Clamping transient overvoltage on high-power T/R module bias rails during RF pulse switching. IC Role / Device Role / Timing Role: Fast-response overvoltage protector absorbing >10 W surge energy without failure. Use Value: 10 W steady-state rating and 12 °C/W thermal resistance allow direct chassis mounting for reliable thermal dissipation. |
| Nuclear Instrumentation | Satellite Payload Reference |
Use Scenario: Providing stable bias for gamma-ray detector photomultiplier tube (PMT) gain control in radiation monitoring systems. IC Role / Device Role / Timing Role: Low-noise, radiation-hardened voltage reference maintaining calibration integrity in high-dose environments. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in reactor containment zones. |
Use Scenario: Generating primary voltage reference for star tracker analog processing in LEO satellites. IC Role / Device Role / Timing Role: Hermetically sealed shunt regulator ensuring long-term parametric stability in vacuum and thermal cycling. Use Value: DO-4 metal-glass package prevents outgassing and maintains 3.9 V regulation accuracy over 15-year mission life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3993A | Same 3.9 V ±5%, DO-4 package, but non-RoHS tin-lead plating and no e3 suffix; lacks RoHS compliance documentation. | Approved for legacy military builds where RoHS exemption applies; not acceptable for new EU-destined or commercial-space programs. | Select 1N3993A only if RoHS compliance is explicitly waived and tin-lead solder process is in place. |
| 1N3993RA | Reverse polarity variant (anode-to-stud); identical electrical specs but inverted terminal assignment. | Required when circuit layout mandates anode connection to chassis ground - incompatible without PCB revision. | Choose 1N3993RA only if mechanical mounting constraints require anode grounding and layout supports polarity reversal. |
Compared with 1N3993A and 1N3993RA, the 1N3993E3 uniquely combines RoHS compliance, cathode-to-stud polarity, and full JANTXV qualification - making it the sole option for new designs requiring environmental compliance and flight-certified reliability without layout changes.
Availability
1N3993E3 is available at Aetrix Electronics and suitable for avionics power regulation, military radar bias supply, and nuclear instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 1N3993E3 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 1N3993E3 belongs to Microsemi's legacy MIL-PRF-19500/124 qualified Zener diode family, engineered for voltage regulation in mission-critical defense, space, and nuclear systems where parameter stability and hermetic integrity are non-negotiable.
FAQ
What is the Zener voltage tolerance and test condition for the 1N3993E3?
The 1N3993E3 has a nominal Zener voltage of 3.9 V with a tolerance of ±5%, measured at a Zener test current (IZT) of 640 mA. This specification is verified per MIL-PRF-19500/124 screening and applies across the full operating temperature range of –65 °C to +175 °C.
Does the 1N3993E3 require a heatsink for 10 W operation?
No external heatsink is required for the 1N3993E3 at 10 W dissipation, provided it is mounted directly to a thermally conductive metal chassis via its threaded stud. Its RθJC of 12 °C/W enables sufficient heat transfer when stud temperature (TC) is maintained at ≤+55 °C; derating applies above that temperature.
What does the "e3" suffix signify in 1N3993E3?
Per Microsemi nomenclature, the "e3" suffix on 1N3993E3 indicates RoHS-compliant matte-tin plating on the terminals - available only on commercial-grade units. It replaces traditional tin-lead plating while maintaining solderability and compatibility with lead-free reflow processes.
Is the 1N3993E3 qualified to MIL-PRF-19500/124?
The 1N3993E3 is offered in commercial grade with RoHS compliance (e3), but MIL-PRF-19500/124 qualification (JAN/JANTX/JANTXV levels) applies only to non-e3 variants like 1N3993A. The e3 suffix denotes commercial-only RoHS compliance and excludes military screening.
What is the polarity configuration of the 1N3993E3?
The 1N3993E3 uses standard polarity for the 1N3993A–1N3998A series: cathode is connected to the threaded stud, and the lead wire is the anode. This configuration is fixed and cannot be altered; reverse-polarity versions (e.g., 1N3993RA) are separate orderable parts.
1N3993E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-203AA, DO-4, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 10 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 500 mV
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 2 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Stud Mount
- Supplier Device Package:
- DO-4 (DO-203AA)
1N3993E3 FAQ
1.How can I place an order for 1N3993E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3993E3 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 1N3993E3 reliable?
The price and inventory of 1N3993E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3993E3 is usually 5 days.
3.What payment methods are accepted for 1N3993E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3993E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3993E3?
1N3993E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3993E3 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 1N3993E3?
For technical support, including 1N3993E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3993E3 requirements.
6.How does Aetrix verify that 1N3993E3 is sourced from the original manufacturer or authorized distributors?
All 1N3993E3 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 1N3993E3 meets industry standards.
7.What is the process for return or replacement of 1N3993E3?
All 1N3993E3 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3993E3, 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 1N3993E3 part is unused and in its original packaging.
Return procedure for 1N3993E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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