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Microchip Technology 1N2989A
- Part No.:
- 1N2989A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N2989A.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:8,024
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Product details
Overview
1N2989A from Microsemi is a 10 W hermetically sealed, stud-mounted Zener diode with nominal Zener voltage of 30 V at 8 mA test current, ±5% tolerance, and dynamic impedance of 85 Ω at IZT. It features anode-to-stud polarity in the DO-213AA (DO-4) metal-glass package and is qualified to MIL-PRF-19500/124 at JANTX level for voltage regulation in high-reliability power supply and reference circuits.
For engineers reviewing the 1N2989A datasheet, 1N2989A pinout, 1N2989A application, or 1N2989A equivalent, this part supports stable voltage clamping in aerospace power conditioning, radiation-hardened instrumentation, military-grade DC-DC feedback loops, and high-temperature analog references where hermetic sealing and thermal robustness are mandatory.
Technical Context
The 1N2989A operates as a precision voltage reference diode in reverse breakdown, delivering regulated 30 V output across 7–300 mA Zener current range with temperature coefficient of +0.091 %/°C. Its junction-to-case thermal resistance is 12 °C/W, enabling 10 W dissipation at stud temperature ≤+55 °C with linear derating above that point.
Constructed with internal solder bond and welded metal-glass hermetic seal, the device exhibits ESD immunity per MIL-STD-750 Method 1020 and inherent radiation hardness per Microsemi MicroNote 050. Polarity is defined as anode-to-stud - critical for correct mounting orientation in heat-sinked chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V ±5% at IZT = 8 mA - defines nominal regulation point with tight tolerance for reference stability |
| Power Dissipation (PD) | 10 W @ TC = +55 °C - enables high-energy clamping without external heatsink beyond stud mount |
| Dynamic Impedance (ZZT) | 85 Ω @ IZT = 8 mA - low AC impedance ensures minimal regulation error under varying load currents |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environmental conditions including space and engine bays |
| Thermal Resistance (RθJC) | 12 °C/W - allows accurate thermal modeling when mounted to conductive chassis or heat sink |
| Reverse Leakage (IR) | 10 µA @ VR = 22.8 V - confirms sharp knee and low off-state conduction for clean regulation onset |
| Forward Voltage (VF) | 1.5 V @ 2.0 A - specifies forward conduction behavior during transient overvoltage or fault conditions |
Pinout & Package
Package: DO-213AA (DO-4), hermetically sealed metal-glass stud package with 10-32 UNF–2A threaded stud (anode terminal) and insulated cathode lead. Weight ≈7.5 g. Mounting requires nut torque ≤15 in-lb.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Threaded Body) | Anode | Primary thermal and electrical connection point; must be mounted to grounded or referenced conductive surface |
| Lead Wire (Insulated) | Cathode | Signal/reference output node; electrically isolated from stud to enable floating or non-ground-referenced regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic metal-glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| JANTX qualification per MIL-PRF-19500/124 | Validated screening for military/aerospace use including temperature cycling, vibration, and burn-in |
| Anode-to-stud polarity | Enables direct thermal coupling to chassis ground while isolating cathode for signal-level referencing |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions or on-board ESD protection in assembly |
| Inherent radiation hardness | Meets total ionizing dose (TID) requirements for low-earth orbit and nuclear instrumentation without shielding |
Applications
| Aerospace Power Bus Regulation | Military DC-DC Converter Reference |
|---|---|
Use Scenario: Stabilizing 28 V aircraft bus against transients and load dump events in avionics power distribution units. IC Role / Device Role / Timing Role: Voltage clamp and reference element in overvoltage protection circuitry, directly mounted to aluminum chassis. Use Value: 10 W power rating and –65 °C to +175 °C operating range ensure reliable clamping during extreme thermal cycling and high-energy surges. |
Use Scenario: Providing precise 30 V reference for feedback loop of a JANTX-qualified 150 W isolated DC-DC converter in tactical radios. IC Role / Device Role / Timing Role: Primary Zener reference in error amplifier bias network, replacing less stable resistor-divider + op-amp solutions. Use Value: ±5% tolerance and +0.091 %/°C TC minimize output drift across –55 °C to +125 °C operational envelope. |
| Radiation-Hardened Instrumentation | High-Temperature Industrial Sensor Supply |
Use Scenario: Generating stable bias voltage for charge-sensitive amplifiers in space-based particle detectors exposed to >100 krad(Si). IC Role / Device Role / Timing Role: Radiation-tolerant voltage reference source, leveraging inherent hardness per MicroNote 050 without added shielding. Use Value: Hermetic seal and silicon design eliminate parametric shift under ionizing radiation, maintaining regulation accuracy over mission lifetime. |
Use Scenario: Regulating excitation voltage for RTD bridges in oil-well downhole tools operating at +150 °C ambient. IC Role / Device Role / Timing Role: High-temperature-stable shunt regulator supplying constant 30 V to precision analog front-end. Use Value: Junction temperature rating up to +175 °C and 12 °C/W RθJC allow direct stud-mounting to tool housing for passive thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N2989B | Same 30 V nominal VZ, but qualified to JANTXV level (enhanced screening) and rated for higher surge current per MIL-PRF-19500/124 Appendix A. | Required where extended reliability testing (e.g., lot acceptance tests, enhanced burn-in) is mandated by system spec. | Select 1N2989B when JANTXV qualification and higher surge margin are contractually required. |
| 1N3002B | 75 V nominal VZ, same DO-4 package and JANTX qualification, but higher voltage and different ZZT (33 Ω @ 22 mA). | Used in higher-voltage regulation stages (e.g., 48 V telecom systems), not drop-in for 30 V designs. | Choose 1N3002B only when redesigning for 75 V reference; not a functional substitute for 1N2989A. |
Compared with 1N2989B, the 1N2989A offers identical electrical regulation but reduced screening depth; compared with 1N3002B, it provides lower voltage and higher dynamic impedance - making it uniquely suited for 30 V, medium-power, high-reliability chassis-mounted regulation where JANTX suffices.
Availability
1N2989A is available at Aetrix Electronics and suitable for aerospace power conditioning, military DC-DC converter reference design, radiation-hardened instrumentation, and high-temperature industrial sensor supply requiring stable component supply across extended lifecycle programs.
Supply support for 1N2989A 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 discrete and analog components.
The 1N2989A belongs to Microsemi's legacy MIL-PRF-19500/124-qualified Zener diode family, engineered for voltage regulation in mission-critical systems where hermeticity, thermal resilience, and long-term parametric stability are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N2989A?
The 1N2989A has a nominal Zener voltage of 30 V with a guaranteed tolerance of ±5% at IZT = 8 mA, as specified in the Electrical Characteristics table on page 4 of T4-LDS-0075 Rev. 3. This tolerance applies to all JAN, JANTX, and JANTXV versions unless tighter limits are specially ordered.
Is the 1N2989A RoHS compliant?
No - the 1N2989A is not RoHS compliant. Per the nomenclature guide on page 2, RoHS compliance (matte-tin plating) is only available for commercial-grade devices with the "e3" suffix (e.g., 1N2989Ae3). The standard 1N2989A uses tin-lead plating and is intended for military/aerospace applications where RoHS exemptions apply.
What is the maximum steady-state power dissipation for the 1N2989A?
The 1N2989A is rated for 10 W steady-state power dissipation at case (stud) temperature TC = +55 °C. Above +55 °C, power must be linearly derated at 0.083 W/°C, reaching zero at +175 °C - consistent with its junction temperature limit and RθJC = 12 °C/W specification.
How is polarity defined for the 1N2989A?
The 1N2989A uses standard polarity: anode is connected to the threaded stud, and cathode is the insulated lead wire. This is confirmed in the Mechanical and Packaging section (page 2) and distinguishes it from reverse-polarity variants (e.g., 1N2989ARB), which would have cathode-to-stud configuration.
Does the 1N2989A require external heat sinking beyond the stud mount?
No - the 1N2989A is designed for direct stud mounting to a thermally conductive chassis or heat sink. Its DO-213AA package and RθJC = 12 °C/W rating assume efficient thermal transfer via the threaded stud; no additional heatsink is needed if the mounting surface maintains TC ≤ +55 °C under full 10 W load.
1N2989A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N2989A FAQ
1.How can I place an order for 1N2989A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N2989A 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 1N2989A reliable?
The price and inventory of 1N2989A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N2989A is usually 5 days.
3.What payment methods are accepted for 1N2989A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N2989A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N2989A?
1N2989A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N2989A 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 1N2989A?
For technical support, including 1N2989A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N2989A requirements.
6.How does Aetrix verify that 1N2989A is sourced from the original manufacturer or authorized distributors?
All 1N2989A 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 1N2989A meets industry standards.
7.What is the process for return or replacement of 1N2989A?
All 1N2989A units undergo pre-shipment inspection (PSI). If there is an issue with 1N2989A, 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 1N2989A part is unused and in its original packaging.
Return procedure for 1N2989A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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