My Inquiry
My Account
Microchip Technology 1N3993A
- Part No.:
- 1N3993A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N3993A.pdf
- Description:
- DIODE ZENER 3.9V 10W DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,877
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N3993A from Microsemi is a 10 W, 3.9 V ±5% Zener diode in a hermetically sealed DO-213AA (DO-4) metal-glass package with cathode-to-stud polarity, qualified to MIL-PRF-19500/124 at JAN/JANTX/JANTXV levels for voltage regulation in high-reliability power supply and reference circuits.
For engineers reviewing the 1N3993A datasheet, 1N3993A pinout, 1N3993A application, or 1N3993A equivalent, this part delivers stable 3.9 V regulation under 640 mA test current, supports junction temperatures from –65 °C to +175 °C, and provides low dynamic impedance (2.0 Ω @ IZT) for precision feedback loops in military-grade power systems.
Technical Context
The 1N3993A operates as a high-power, temperature-stable voltage reference using avalanche breakdown in a welded metal-glass enclosure. Its 3.9 V nominal Zener voltage is specified at 640 mA test current (IZT), with dynamic impedance of 2.0 Ω and temperature coefficient of –0.060 %/°C - indicating negative drift optimized for low-voltage stabilization.
Designed for stud-mounting with 10–32 UNF–2A threads, it features tin-lead or RoHS-compliant matte-tin plating on nickel, 12 °C/W junction-to-case thermal resistance, and is rated for 10 W steady-state dissipation at TC = +55 °C with linear derating above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% @ 640 mA - defines precise regulation point for low-voltage reference circuits |
| Power Dissipation (PD) | 10 W @ TC = +55 °C - enables high-current shunt regulation without external heatsinking at moderate ambient |
| Dynamic Impedance (ZZT) | 2.0 Ω @ IZT - ensures minimal output voltage variation under load transients in feedback networks |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environments including aerospace and downhole electronics |
| Thermal Resistance (RθJC) | 12 °C/W - allows accurate thermal modeling when mounted to chassis or heat spreader via stud |
| Reverse Leakage (IR) | 100 µA @ 0.5 V - confirms tight leakage control critical for low-power standby regulation |
| Forward Voltage (VF) | 1.5 V @ 2.0 A - specifies forward conduction behavior during transient overvoltage clamping or polarity protection |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Case) | Cathode | Primary current-carrying terminal and thermal path; must be electrically connected to system ground or regulated rail return |
| Lead (Wire) | Anode | Signal/reference connection point; polarity reversal requires RA-suffixed variant (anode-to-stud) |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic metal-glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| MIL-PRF-19500/124 qualification | Validated reliability for JAN/JANTX/JANTXV grades ensures performance consistency across military temperature and life-cycle requirements |
| Cathode-to-stud polarity (standard) | Enables direct chassis grounding of cathode for simplified thermal and EMI management in high-noise power systems |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions beyond standard static-safe protocols during assembly |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications without shielding |
Applications
| Avionics Power Regulation | Military Radar Bias Supply |
|---|---|
|
Use Scenario: Stabilizing +3.3 V or +5 V auxiliary rails in airborne mission computers where input voltage varies widely due to generator fluctuations. IC Role / Device Role / Timing Role: Shunt voltage reference providing error signal to discrete pass transistor or PWM controller. Use Value: Maintains regulation within ±5% across –55 °C to +125 °C ambient and withstands vibration-induced thermal cycling without parameter shift. |
Use Scenario: Setting precise bias points for GaN RF power amplifier stages in ground-based radar transmitters operating at 1 kW peak power. IC Role / Device Role / Timing Role: High-stability DC reference for gate bias networks requiring sub-10 mV drift over 10,000-hour field life. Use Value: 2.0 Ω dynamic impedance minimizes ripple coupling into sensitive analog bias nodes under pulsed RF loading. |
| Satellite Payload Reference | Nuclear Instrumentation |
|
Use Scenario: Providing primary voltage reference for ADCs and DACs in LEO satellite telemetry subsystems exposed to total ionizing dose >100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened Zener element in metrology-grade voltage divider networks. Use Value: Inherent radiation tolerance eliminates need for shielding or redundancy, reducing SWaP-C in constrained payload bays. |
Use Scenario: Regulating detector bias voltage in gamma spectroscopy front-end modules deployed in reactor containment zones. IC Role / Device Role / Timing Role: Primary shunt regulator maintaining stable HV bias despite wide ambient temperature swings (–20 °C to +70 °C) and neutron flux exposure. Use Value: Stable –0.060 %/°C tempco and 100 µA leakage at 0.5 V ensure <0.1% gain drift over full operational range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3993B | Same 3.9 V ±5%, but rated only to JANTX level (not JANTXV); slightly higher ZZT (2.2 Ω vs. 2.0 Ω) | Lacks full JANTXV qualification for extended temperature life testing and burn-in screening | Select when full JANTXV screening is not required and cost sensitivity outweighs extended reliability validation |
| 1N5335B | 3.9 V ±5%, 5 W rating, DO-41 package, commercial-only; no MIL qualification or hermetic seal | Not suitable for military, aerospace, or high-reliability industrial use; limited to benign ambient conditions | Choose only for non-critical commercial prototypes or cost-driven consumer designs where radiation hardness and hermeticity are unnecessary |
Compared with 1N3993B and 1N5335B, the 1N3993A uniquely combines JANTXV-level qualification, hermetic sealing, and 10 W power handling - making it the only option for mission-critical shunt regulation where parameter stability under radiation, thermal shock, and long-term humidity exposure is mandatory.
Availability
1N3993A is available at Aetrix Electronics and suitable for avionics power regulation, military radar bias supply, and satellite payload reference requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N3993A 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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N3993A belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for ruggedized voltage reference and shunt regulation in safety-critical power systems where hermeticity, radiation tolerance, and extended temperature operation are non-negotiable.
FAQ
What is the Zener voltage tolerance and test condition for the 1N3993A?
The 1N3993A 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 guaranteed across the full qualified temperature range and applies to all JAN, JANTX, and JANTXV versions of the 1N3993A per MIL-PRF-19500/124.
Does the 1N3993A have a hermetic package, and what is its construction?
Yes, the 1N3993A uses a hermetically sealed DO-213AA (DO-4) package constructed with welded metal and glass. This construction prevents moisture ingress and ensures long-term parameter stability in harsh environments - a key requirement validated under MIL-PRF-19500/124 qualification for the 1N3993A.
What is the polarity configuration of the 1N3993A, and how is it indicated?
The 1N3993A has standard polarity with cathode connected to the threaded stud and anode at the lead wire. Reverse polarity (anode-to-stud) is available as the 1N3993A-RA variant. The standard 1N3993A designation explicitly indicates cathode-to-stud orientation per Microsemi's nomenclature guide.
Can the 1N3993A be used in radiation-intensive environments such as space or nuclear facilities?
Yes, the 1N3993A exhibits inherent radiation hardness documented in Microsemi MicroNote 050. It is routinely deployed in satellite payloads and nuclear instrumentation where total ionizing dose tolerance and displacement damage resistance are required - a verified characteristic of the 1N3993A family.
What are the thermal derating requirements for the 1N3993A above +55 °C?
The 1N3993A must be derated at 0.083 W/°C above +55 °C case temperature, per its maximum ratings table. At +175 °C junction temperature, power dissipation reaches zero. This linear derating curve is defined in the T4-LDS-0075 datasheet and applies directly to the 1N3993A's thermal management design.
1N3993A 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-213AA (DO-4)
1N3993A FAQ
1.How can I place an order for 1N3993A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3993A 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 1N3993A reliable?
The price and inventory of 1N3993A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3993A is usually 5 days.
3.What payment methods are accepted for 1N3993A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3993A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3993A?
1N3993A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3993A 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 1N3993A?
For technical support, including 1N3993A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3993A requirements.
6.How does Aetrix verify that 1N3993A is sourced from the original manufacturer or authorized distributors?
All 1N3993A 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 1N3993A meets industry standards.
7.What is the process for return or replacement of 1N3993A?
All 1N3993A units undergo pre-shipment inspection (PSI). If there is an issue with 1N3993A, 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 1N3993A part is unused and in its original packaging.
Return procedure for 1N3993A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3993A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
