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Microchip Technology 1N983A
- Part No.:
- 1N983A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N983A.pdf
- Description:
- DIODE ZENER 82V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:3,259
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Product details
Overview
1N983A from Microsemi is a silicon 500 mW axial-lead Zener diode with nominal Zener voltage of 82 V, ±10% tolerance (A suffix), 1.5 mA Zener test current, 330 Ω dynamic impedance at IZT, and maximum reverse leakage of 5 μA at 62.2 V. It operates across –65 °C to +175 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N983A datasheet, 1N983A pinout, 1N983A application, or 1N983A equivalent, this page delivers verified electrical specs, DO-35 package details, thermal derating behavior, temperature coefficient (+0.098 %/°C), and direct alternatives with documented voltage/tolerance/impedance differences.
Technical Context
The 1N983A functions as a two-terminal voltage regulator in reverse-bias breakdown mode, maintaining stable 82 V output across a wide operating current range (IZK = 0.25 mA to IZM = 4.6 mA). Its glass DO-35 package ensures hermetic sealing and radiation hardness per MicroNote 050.
It exhibits a positive temperature coefficient of +0.098 %/°C - meaning Zener voltage increases with junction temperature - and features low capacitance (<2 pF typical) and ESD immunity per MIL-STD-750 Method 1020. Thermal resistance is 250 °C/W junction-to-lead at 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 82 V ±10% - defines regulated output level under specified test conditions; usable for mid-range HV reference circuits |
| Zener Test Current (IZT) | 1.5 mA - current at which VZ is measured; sets baseline operating point for regulation stability |
| Zener Impedance (ZZT) | 330 Ω at IZT - indicates voltage variation vs. current change; impacts regulation accuracy under load transients |
| Max DC Zener Current (IZM) | 4.6 mA - maximum steady-state current before exceeding 400 mW dissipation at 75 °C lead temp |
| Reverse Leakage Current | 5 μA at 62.2 V - ensures minimal standby power loss in high-impedance bias networks |
| Temp. Coefficient (αVZ) | +0.098 %/°C - quantifies drift magnitude; requires thermal design margin for ±0.5% voltage stability |
| Power Dissipation | 500 mW at TL ≤ 50 °C (3/8″ lead length) - defines safe continuous operation limit with appropriate heatsinking |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-lead glass body, cathode indicated by color band. Terminals are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward voltage ≤1.3 V @ 200 mA |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines polarity for regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Complies with industry-standard 1N957B–1N992B family specifications and test methods |
| ±10% voltage tolerance (A suffix) | Cost-optimized tolerance grade suitable for non-critical reference and clamping applications |
| Low reverse leakage (5 μA @ 62.2 V) | Minimizes quiescent current draw in battery-backed or high-impedance sensing circuits |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 supports use in aerospace and defense environments |
| ESD robustness | Passes MIL-STD-750 Method 1020 - eliminates need for external ESD protection in many layouts |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp in Telecom Line Cards |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing stable 82 V reference for TL431 or optocoupler biasing. Use Value: Enables accurate output regulation despite input line variations and temperature drift up to +175 °C ambient. |
Use Scenario: Protecting downstream circuitry from transient surges on -48 V telecom distribution lines. IC Role / Device Role / Timing Role: Shunt clamp absorbing energy above 82 V threshold during lightning-induced spikes. Use Value: Limits peak voltage to 82 V ±10% with 330 Ω dynamic impedance, reducing stress on downstream FETs and controllers. |
| High-Temperature Sensor Bias Network | Legacy Equipment Voltage Calibration Standard |
Use Scenario: Providing excitation voltage for RTD or thermistor bridges in oil & gas downhole tools. IC Role / Device Role / Timing Role: Stable Zener source powering Wheatstone bridge with minimal self-heating error. Use Value: Operates reliably from –65 °C to +175 °C without parameter shift beyond spec, enabling single-point calibration. |
Use Scenario: Serving as traceable 82 V reference in field-service calibration of analog panel meters. IC Role / Device Role / Timing Role: Primary voltage standard replacing obsolete 1N983 units in metrology-grade repair kits. Use Value: Maintains legacy compatibility with original equipment schematics while meeting RoHS requirements when ordered with e3 suffix. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N983B | Same 82 V nominal voltage but ±5% tolerance (B suffix); 330 Ω ZZT; 1.5 mA IZT | Tighter voltage spec enables higher-accuracy references; higher cost than A-grade | Select 1N983B when system-level voltage tolerance must be ≤±5% across temperature and life |
| MMBZ5257B (ON Semiconductor) | SMD SOT-23 package; 82 V ±5%; 300 Ω ZZT; 1.5 mA IZT; max PD = 225 mW | Lower power rating and surface-mount form factor - unsuitable for through-hole 500 mW designs | Choose MMBZ5257B only for space-constrained PCBs where 225 mW dissipation suffices and reworkability is prioritized |
Compared with 1N983A, 1N983B offers tighter voltage control for precision references, while MMBZ5257B trades power handling and through-hole compatibility for miniaturization - neither is pin-compatible, and both require layout or thermal redesign.
Availability
1N983A is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, high-temperature sensor biasing, and legacy calibration equipment requiring stable component supply and long-term obsolescence management.
Supply support for 1N983A 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N957B–1N992B series was designed to deliver JEDEC-standardized, glass-encapsulated Zener regulation with extended temperature range and proven reliability in mission-critical analog signal conditioning and power management.
FAQ
What is the Zener voltage tolerance of the 1N983A?
The 1N983A has a nominal Zener voltage of 82 V with a ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ falls between 73.8 V and 90.2 V at 1.5 mA test current and 25 °C. The tolerance reflects manufacturing spread and is validated per JEDEC test methods.
Can the 1N983A replace the 1N983B in an existing design?
The 1N983A can functionally replace the 1N983B only if the application tolerates ±10% Zener voltage variation instead of ±5%. Since both share identical package (DO-35), pinout, and thermal specs, no PCB changes are needed - but system-level accuracy may degrade due to wider voltage spread. Always verify worst-case regulation margin.
What is the maximum power dissipation for the 1N983A at 75 °C lead temperature?
At a lead temperature (TL) of 75 °C, the 1N983A is rated for 400 mW maximum power dissipation, derived from its 500 mW rating at TL ≤ 50 °C and linear derating slope of 4 mW/°C. This limit ensures junction temperature remains within safe operating range under sustained load.
Does the 1N983A meet RoHS requirements?
The base 1N983A is not RoHS-compliant by default. To obtain RoHS compliance, the part must be ordered with the "e3" suffix (i.e., 1N983Ae3), indicating annealed matte-tin plating per Microsemi's packaging specification. Standard 1N983A uses Sn/Pb terminations.
What is the reverse leakage current specification for the 1N983A?
The 1N983A specifies a maximum reverse leakage current of 5 μA at 62.2 V (76% of nominal 82 V), measured at 25 °C. This value ensures minimal current draw in high-impedance bias networks and contributes to low standby power in voltage-monitoring circuits.
1N983A 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):
- 82 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 330 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 62.2 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
1N983A FAQ
1.How can I place an order for 1N983A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N983A 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 1N983A reliable?
The price and inventory of 1N983A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N983A is usually 5 days.
3.What payment methods are accepted for 1N983A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N983A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N983A?
1N983A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N983A 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 1N983A?
For technical support, including 1N983A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N983A requirements.
6.How does Aetrix verify that 1N983A is sourced from the original manufacturer or authorized distributors?
All 1N983A 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 1N983A meets industry standards.
7.What is the process for return or replacement of 1N983A?
All 1N983A units undergo pre-shipment inspection (PSI). If there is an issue with 1N983A, 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 1N983A part is unused and in its original packaging.
Return procedure for 1N983A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N983A Tags
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